/*
- * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2017 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
*
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
*
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
*
* @(#)vfs_subr.c 8.31 (Berkeley) 5/26/95
*/
+/*
+ * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
+ * support for mandatory and extensible security protections. This notice
+ * is included in support of clause 2.2 (b) of the Apple Public License,
+ * Version 2.0.
+ */
/*
* External virtual filesystem routines
*/
-#undef DIAGNOSTIC
-#define DIAGNOSTIC 1
-
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc_internal.h>
#include <sys/mount_internal.h>
#include <sys/time.h>
#include <sys/lock.h>
+#include <sys/vnode.h>
#include <sys/vnode_internal.h>
#include <sys/stat.h>
#include <sys/namei.h>
#include <sys/buf_internal.h>
#include <sys/errno.h>
#include <sys/malloc.h>
+#include <sys/uio_internal.h>
+#include <sys/uio.h>
#include <sys/domain.h>
#include <sys/mbuf.h>
#include <sys/syslog.h>
#include <sys/kdebug.h>
#include <sys/kauth.h>
#include <sys/user.h>
+#include <sys/systm.h>
+#include <sys/kern_memorystatus.h>
+#include <sys/lockf.h>
#include <miscfs/fifofs/fifo.h>
#include <string.h>
-#include <machine/spl.h>
-
+#include <machine/machine_routines.h>
#include <kern/assert.h>
+#include <mach/kern_return.h>
+#include <kern/thread.h>
+#include <kern/sched_prim.h>
#include <miscfs/specfs/specdev.h>
#include <mach/mach_types.h>
#include <mach/memory_object_types.h>
+#include <mach/memory_object_control.h>
+
+#include <kern/kalloc.h> /* kalloc()/kfree() */
+#include <kern/clock.h> /* delay_for_interval() */
+#include <libkern/OSAtomic.h> /* OSAddAtomic() */
+#if !CONFIG_EMBEDDED
+#include <console/video_console.h>
+#endif
+
+#ifdef JOE_DEBUG
+#include <libkern/OSDebug.h>
+#endif
+
+#include <vm/vm_protos.h> /* vnode_pager_vrele() */
+
+#if CONFIG_MACF
+#include <security/mac_framework.h>
+#endif
+
+#include <vfs/vfs_disk_conditioner.h>
+#include <libkern/section_keywords.h>
extern lck_grp_t *vnode_lck_grp;
extern lck_attr_t *vnode_lck_attr;
+#if CONFIG_TRIGGERS
+extern lck_grp_t *trigger_vnode_lck_grp;
+extern lck_attr_t *trigger_vnode_lck_attr;
+#endif
extern lck_mtx_t * mnt_list_mtx_lock;
S_IFSOCK, S_IFIFO, S_IFMT,
};
-extern int ubc_isinuse_locked(vnode_t, int, int);
-extern kern_return_t adjust_vm_object_cache(vm_size_t oval, vm_size_t nval);
+
+/* XXX These should be in a BSD accessible Mach header, but aren't. */
+extern void memory_object_mark_used(
+ memory_object_control_t control);
+
+extern void memory_object_mark_unused(
+ memory_object_control_t control,
+ boolean_t rage);
+
+extern void memory_object_mark_io_tracking(
+ memory_object_control_t control);
+
+/* XXX next protptype should be from <nfs/nfs.h> */
+extern int nfs_vinvalbuf(vnode_t, int, vfs_context_t, int);
+
+extern int paniclog_append_noflush(const char *format, ...);
+
+/* XXX next prototytype should be from libsa/stdlib.h> but conflicts libkern */
+__private_extern__ void qsort(
+ void * array,
+ size_t nmembers,
+ size_t member_size,
+ int (*)(const void *, const void *));
+
+__private_extern__ void vntblinit(void);
+__private_extern__ int unlink1(vfs_context_t, vnode_t, user_addr_t,
+ enum uio_seg, int);
+
+extern int system_inshutdown;
static void vnode_list_add(vnode_t);
+static void vnode_async_list_add(vnode_t);
static void vnode_list_remove(vnode_t);
+static void vnode_list_remove_locked(vnode_t);
+static void vnode_abort_advlocks(vnode_t);
static errno_t vnode_drain(vnode_t);
-static void vgone(vnode_t);
-static void vclean(vnode_t vp, int flag, proc_t p);
-static void vnode_reclaim_internal(vnode_t, int, int);
+static void vgone(vnode_t, int flags);
+static void vclean(vnode_t vp, int flag);
+static void vnode_reclaim_internal(vnode_t, int, int, int);
-static void vnode_dropiocount (vnode_t, int);
-static errno_t vnode_getiocount(vnode_t vp, int locked, int vid, int vflags);
-static int vget_internal(vnode_t, int, int);
+static void vnode_dropiocount (vnode_t);
static vnode_t checkalias(vnode_t vp, dev_t nvp_rdev);
static int vnode_reload(vnode_t);
static int vnode_isinuse_locked(vnode_t, int, int);
+static int unmount_callback(mount_t, __unused void *);
+
static void insmntque(vnode_t vp, mount_t mp);
-mount_t mount_list_lookupby_fsid(fsid_t *, int, int);
static int mount_getvfscnt(void);
static int mount_fillfsids(fsid_t *, int );
static void vnode_iterate_setup(mount_t);
-static int vnode_umount_preflight(mount_t, vnode_t, int);
+int vnode_umount_preflight(mount_t, vnode_t, int);
static int vnode_iterate_prepare(mount_t);
static int vnode_iterate_reloadq(mount_t);
static void vnode_iterate_clear(mount_t);
+static mount_t vfs_getvfs_locked(fsid_t *);
+static int vn_create_reg(vnode_t dvp, vnode_t *vpp, struct nameidata *ndp,
+ struct vnode_attr *vap, uint32_t flags, int fmode, uint32_t *statusp, vfs_context_t ctx);
+static int vnode_authattr_new_internal(vnode_t dvp, struct vnode_attr *vap, int noauth, uint32_t *defaulted_fieldsp, vfs_context_t ctx);
+
+errno_t rmdir_remove_orphaned_appleDouble(vnode_t, vfs_context_t, int *);
+
+#ifdef JOE_DEBUG
+static void record_vp(vnode_t vp, int count);
+#endif
+
+#if CONFIG_JETSAM && (DEVELOPMENT || DEBUG)
+extern int bootarg_no_vnode_jetsam; /* from bsd_init.c default value is 0 */
+#endif /* CONFIG_JETSAM && (DEVELOPMENT || DEBUG) */
+
+boolean_t root_is_CF_drive = FALSE;
+
+#if CONFIG_TRIGGERS
+static int vnode_resolver_create(mount_t, vnode_t, struct vnode_trigger_param *, boolean_t external);
+static void vnode_resolver_detach(vnode_t);
+#endif
TAILQ_HEAD(freelst, vnode) vnode_free_list; /* vnode free list */
-TAILQ_HEAD(inactivelst, vnode) vnode_inactive_list; /* vnode inactive list */
+TAILQ_HEAD(deadlst, vnode) vnode_dead_list; /* vnode dead list */
+TAILQ_HEAD(async_work_lst, vnode) vnode_async_work_list;
+
+
+TAILQ_HEAD(ragelst, vnode) vnode_rage_list; /* vnode rapid age list */
+struct timeval rage_tv;
+int rage_limit = 0;
+int ragevnodes = 0;
+
+#define RAGE_LIMIT_MIN 100
+#define RAGE_TIME_LIMIT 5
+
struct mntlist mountlist; /* mounted filesystem list */
static int nummounts = 0;
#define VLISTCHECK(fun, vp, list) \
if ((vp)->v_freelist.tqe_prev == (struct vnode **)0xdeadb) \
panic("%s: %s vnode not on %slist", (fun), (list), (list));
-
-#define VINACTIVECHECK(fun, vp, expected) \
- do { \
- int __is_inactive = ISSET((vp)->v_flag, VUINACTIVE); \
- if (__is_inactive ^ expected) \
- panic("%s: %sinactive vnode, expected %s", (fun), \
- __is_inactive? "" : "not ", \
- expected? "inactive": "not inactive"); \
- } while(0)
#else
#define VLISTCHECK(fun, vp, list)
-#define VINACTIVECHECK(fun, vp, expected)
#endif /* DIAGNOSTIC */
#define VLISTNONE(vp) \
freevnodes--; \
} while(0)
-/* remove a vnode from inactive vnode list */
-#define VREMINACTIVE(fun, vp) \
+
+/* remove a vnode from dead vnode list */
+#define VREMDEAD(fun, vp) \
do { \
- VLISTCHECK((fun), (vp), "inactive"); \
- VINACTIVECHECK((fun), (vp), VUINACTIVE); \
- TAILQ_REMOVE(&vnode_inactive_list, (vp), v_freelist); \
- CLR((vp)->v_flag, VUINACTIVE); \
+ VLISTCHECK((fun), (vp), "dead"); \
+ TAILQ_REMOVE(&vnode_dead_list, (vp), v_freelist); \
VLISTNONE((vp)); \
- inactivevnodes--; \
+ vp->v_listflag &= ~VLIST_DEAD; \
+ deadvnodes--; \
} while(0)
-/*
- * Have to declare first two locks as actual data even if !MACH_SLOCKS, since
- * a pointers to them get passed around.
- */
-void * mntvnode_slock;
-void * mntid_slock;
-void * spechash_slock;
-/*
- * vnodetarget is the amount of vnodes we expect to get back
- * from the the inactive vnode list and VM object cache.
- * As vnreclaim() is a mainly cpu bound operation for faster
- * processers this number could be higher.
- * Having this number too high introduces longer delays in
- * the execution of new_vnode().
- */
-unsigned long vnodetarget; /* target for vnreclaim() */
-#define VNODE_FREE_TARGET 20 /* Default value for vnodetarget */
+/* remove a vnode from async work vnode list */
+#define VREMASYNC_WORK(fun, vp) \
+ do { \
+ VLISTCHECK((fun), (vp), "async_work"); \
+ TAILQ_REMOVE(&vnode_async_work_list, (vp), v_freelist); \
+ VLISTNONE((vp)); \
+ vp->v_listflag &= ~VLIST_ASYNC_WORK; \
+ async_work_vnodes--; \
+ } while(0)
-/*
- * We need quite a few vnodes on the free list to sustain the
- * rapid stat() the compilation process does, and still benefit from the name
- * cache. Having too few vnodes on the free list causes serious disk
- * thrashing as we cycle through them.
- */
-#define VNODE_FREE_MIN 300 /* freelist should have at least these many */
-/*
- * We need to get vnodes back from the VM object cache when a certain #
- * of vnodes are reused from the freelist. This is essential for the
- * caching to be effective in the namecache and the buffer cache [for the
- * metadata].
- */
-#define VNODE_TOOMANY_REUSED (VNODE_FREE_MIN/4)
+/* remove a vnode from rage vnode list */
+#define VREMRAGE(fun, vp) \
+ do { \
+ if ( !(vp->v_listflag & VLIST_RAGE)) \
+ panic("VREMRAGE: vp not on rage list"); \
+ VLISTCHECK((fun), (vp), "rage"); \
+ TAILQ_REMOVE(&vnode_rage_list, (vp), v_freelist); \
+ VLISTNONE((vp)); \
+ vp->v_listflag &= ~VLIST_RAGE; \
+ ragevnodes--; \
+ } while(0)
-/*
- * If we have enough vnodes on the freelist we do not want to reclaim
- * the vnodes from the VM object cache.
- */
-#define VNODE_FREE_ENOUGH (VNODE_FREE_MIN + (VNODE_FREE_MIN/2))
+static void async_work_continue(void);
/*
* Initialize the vnode management data structures.
__private_extern__ void
vntblinit(void)
{
+ thread_t thread = THREAD_NULL;
+
TAILQ_INIT(&vnode_free_list);
- TAILQ_INIT(&vnode_inactive_list);
+ TAILQ_INIT(&vnode_rage_list);
+ TAILQ_INIT(&vnode_dead_list);
+ TAILQ_INIT(&vnode_async_work_list);
TAILQ_INIT(&mountlist);
- if (!vnodetarget)
- vnodetarget = VNODE_FREE_TARGET;
+ microuptime(&rage_tv);
+ rage_limit = desiredvnodes / 100;
+ if (rage_limit < RAGE_LIMIT_MIN)
+ rage_limit = RAGE_LIMIT_MIN;
+
/*
- * Scale the vm_object_cache to accomodate the vnodes
- * we want to cache
+ * create worker threads
*/
- (void) adjust_vm_object_cache(0, desiredvnodes - VNODE_FREE_MIN);
-}
-
-/* Reset the VM Object Cache with the values passed in */
-__private_extern__ kern_return_t
-reset_vmobjectcache(unsigned int val1, unsigned int val2)
-{
- vm_size_t oval = val1 - VNODE_FREE_MIN;
- vm_size_t nval;
-
- if(val2 < VNODE_FREE_MIN)
- nval = 0;
- else
- nval = val2 - VNODE_FREE_MIN;
-
- return(adjust_vm_object_cache(oval, nval));
+ kernel_thread_start((thread_continue_t)async_work_continue, NULL, &thread);
+ thread_deallocate(thread);
}
-
/* the timeout is in 10 msecs */
int
-vnode_waitforwrites(vnode_t vp, int output_target, int slpflag, int slptimeout, char *msg) {
+vnode_waitforwrites(vnode_t vp, int output_target, int slpflag, int slptimeout, const char *msg) {
int error = 0;
struct timespec ts;
if (vp->v_numoutput > output_target) {
- slpflag &= ~PDROP;
+ slpflag |= PDROP;
- vnode_lock(vp);
+ vnode_lock_spin(vp);
while ((vp->v_numoutput > output_target) && error == 0) {
if (output_target)
vp->v_flag |= VTHROTTLED;
else
vp->v_flag |= VBWAIT;
+
ts.tv_sec = (slptimeout/100);
ts.tv_nsec = (slptimeout % 1000) * 10 * NSEC_PER_USEC * 1000 ;
error = msleep((caddr_t)&vp->v_numoutput, &vp->v_lock, (slpflag | (PRIBIO + 1)), msg, &ts);
+
+ vnode_lock_spin(vp);
}
vnode_unlock(vp);
}
vnode_writedone(vnode_t vp)
{
if (vp) {
- int need_wakeup = 0;
-
+ int need_wakeup = 0;
+
OSAddAtomic(-1, &vp->v_numoutput);
- vnode_lock(vp);
+ vnode_lock_spin(vp);
if (vp->v_numoutput < 0)
panic("vnode_writedone: numoutput < 0");
- if ((vp->v_flag & VTHROTTLED) && (vp->v_numoutput < (VNODE_ASYNC_THROTTLE / 3))) {
+ if ((vp->v_flag & VTHROTTLED)) {
vp->v_flag &= ~VTHROTTLED;
need_wakeup = 1;
}
if ((vp->v_flag & VBWAIT) && (vp->v_numoutput == 0)) {
- vp->v_flag &= ~VBWAIT;
+ vp->v_flag &= ~VBWAIT;
need_wakeup = 1;
}
vnode_unlock(vp);
if (need_wakeup)
- wakeup((caddr_t)&vp->v_numoutput);
+ wakeup((caddr_t)&vp->v_numoutput);
}
}
void
vnode_iterate_setup(mount_t mp)
{
- while (mp->mnt_lflag & MNT_LITER) {
- mp->mnt_lflag |= MNT_LITERWAIT;
- msleep((caddr_t)mp, &mp->mnt_mlock, PVFS, "vnode_iterate_setup", 0);
- }
-
mp->mnt_lflag |= MNT_LITER;
-
}
-static int
+int
vnode_umount_preflight(mount_t mp, vnode_t skipvp, int flags)
{
vnode_t vp;
TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) {
- if (vp->v_type == VDIR)
- continue;
+ if (vp->v_type == VDIR)
+ continue;
if (vp == skipvp)
continue;
- if ((flags & SKIPSYSTEM) && ((vp->v_flag & VSYSTEM) ||
- (vp->v_flag & VNOFLUSH)))
+ if ((flags & SKIPSYSTEM) && ((vp->v_flag & VSYSTEM) || (vp->v_flag & VNOFLUSH)))
continue;
if ((flags & SKIPSWAP) && (vp->v_flag & VSWAP))
continue;
- if ((flags & WRITECLOSE) &&
- (vp->v_writecount == 0 || vp->v_type != VREG))
+ if ((flags & WRITECLOSE) && (vp->v_writecount == 0 || vp->v_type != VREG))
continue;
+
/* Look for busy vnode */
- if (((vp->v_usecount != 0) &&
- ((vp->v_usecount - vp->v_kusecount) != 0)))
- return(1);
+ if ((vp->v_usecount != 0) && ((vp->v_usecount - vp->v_kusecount) != 0)) {
+ return 1;
+
+ } else if (vp->v_iocount > 0) {
+ /* Busy if iocount is > 0 for more than 3 seconds */
+ tsleep(&vp->v_iocount, PVFS, "vnode_drain_network", 3 * hz);
+ if (vp->v_iocount > 0)
+ return 1;
+ continue;
}
+ }
- return(0);
+ return 0;
}
/*
vnode_iterate_clear(mount_t mp)
{
mp->mnt_lflag &= ~MNT_LITER;
- if (mp->mnt_lflag & MNT_LITERWAIT) {
- mp->mnt_lflag &= ~MNT_LITERWAIT;
- wakeup(mp);
- }
}
+#if !CONFIG_EMBEDDED
-int
-vnode_iterate(mp, flags, callout, arg)
+#include <i386/panic_hooks.h>
+
+struct vnode_iterate_panic_hook {
+ panic_hook_t hook;
mount_t mp;
- int flags;
- int (*callout)(struct vnode *, void *);
- void * arg;
+ struct vnode *vp;
+};
+
+static void vnode_iterate_panic_hook(panic_hook_t *hook_)
+{
+ struct vnode_iterate_panic_hook *hook = (struct vnode_iterate_panic_hook *)hook_;
+ panic_phys_range_t range;
+ uint64_t phys;
+
+ if (panic_phys_range_before(hook->mp, &phys, &range)) {
+ paniclog_append_noflush("mp = %p, phys = %p, prev (%p: %p-%p)\n",
+ hook->mp, phys, range.type, range.phys_start,
+ range.phys_start + range.len);
+ } else {
+ paniclog_append_noflush("mp = %p, phys = %p, prev (!)\n", hook->mp, phys);
+ }
+
+ if (panic_phys_range_before(hook->vp, &phys, &range)) {
+ paniclog_append_noflush("vp = %p, phys = %p, prev (%p: %p-%p)\n",
+ hook->vp, phys, range.type, range.phys_start,
+ range.phys_start + range.len);
+ } else {
+ paniclog_append_noflush("vp = %p, phys = %p, prev (!)\n", hook->vp, phys);
+ }
+ panic_dump_mem((void *)(((vm_offset_t)hook->mp -4096) & ~4095), 12288);
+}
+#endif //CONFIG_EMBEDDED
+
+int
+vnode_iterate(mount_t mp, int flags, int (*callout)(struct vnode *, void *),
+ void *arg)
{
struct vnode *vp;
int vid, retval;
int ret = 0;
+ /*
+ * The mount iterate mutex is held for the duration of the iteration.
+ * This can be done by a state flag on the mount structure but we can
+ * run into priority inversion issues sometimes.
+ * Using a mutex allows us to benefit from the priority donation
+ * mechanisms in the kernel for locks. This mutex should never be
+ * acquired in spin mode and it should be acquired before attempting to
+ * acquire the mount lock.
+ */
+ mount_iterate_lock(mp);
+
mount_lock(mp);
vnode_iterate_setup(mp);
- /* it is returns 0 then there is nothing to do */
+ /* If it returns 0 then there is nothing to do */
retval = vnode_iterate_prepare(mp);
if (retval == 0) {
vnode_iterate_clear(mp);
mount_unlock(mp);
+ mount_iterate_unlock(mp);
return(ret);
}
-
+
+#if !CONFIG_EMBEDDED
+ struct vnode_iterate_panic_hook hook;
+ hook.mp = mp;
+ hook.vp = NULL;
+ panic_hook(&hook.hook, vnode_iterate_panic_hook);
+#endif
/* iterate over all the vnodes */
while (!TAILQ_EMPTY(&mp->mnt_workerqueue)) {
vp = TAILQ_FIRST(&mp->mnt_workerqueue);
+#if !CONFIG_EMBEDDED
+ hook.vp = vp;
+#endif
TAILQ_REMOVE(&mp->mnt_workerqueue, vp, v_mntvnodes);
TAILQ_INSERT_TAIL(&mp->mnt_vnodelist, vp, v_mntvnodes);
vid = vp->v_id;
}
out:
+#if !CONFIG_EMBEDDED
+ panic_unhook(&hook.hook);
+#endif
(void)vnode_iterate_reloadq(mp);
vnode_iterate_clear(mp);
mount_unlock(mp);
+ mount_iterate_unlock(mp);
return (ret);
}
lck_mtx_unlock(&mp->mnt_renamelock);
}
+void
+mount_iterate_lock(mount_t mp)
+{
+ lck_mtx_lock(&mp->mnt_iter_lock);
+}
+
+void
+mount_iterate_unlock(mount_t mp)
+{
+ lck_mtx_unlock(&mp->mnt_iter_lock);
+}
+
void
mount_lock(mount_t mp)
{
lck_mtx_lock(&mp->mnt_mlock);
}
+void
+mount_lock_spin(mount_t mp)
+{
+ lck_mtx_lock_spin(&mp->mnt_mlock);
+}
+
void
mount_unlock(mount_t mp)
{
mount_ref(mount_t mp, int locked)
{
if ( !locked)
- mount_lock(mp);
+ mount_lock_spin(mp);
mp->mnt_count++;
mount_drop(mount_t mp, int locked)
{
if ( !locked)
- mount_lock(mp);
+ mount_lock_spin(mp);
mp->mnt_count--;
{
mount_list_lock();
while (mp->mnt_iterref)
- msleep((caddr_t)&mp->mnt_iterref, mnt_list_mtx_lock, PVFS, "mount_iterdrain", 0 );
+ msleep((caddr_t)&mp->mnt_iterref, mnt_list_mtx_lock, PVFS, "mount_iterdrain", NULL);
/* mount iterations drained */
mp->mnt_iterref = -1;
mount_list_unlock();
mp->mnt_lflag |= MNT_LDRAIN;
while (mp->mnt_count)
- msleep((caddr_t)&mp->mnt_lflag, &mp->mnt_mlock, PVFS, "mount_drain", 0 );
+ msleep((caddr_t)&mp->mnt_lflag, &mp->mnt_mlock, PVFS, "mount_drain", NULL);
if (mp->mnt_vnodelist.tqh_first != NULL)
panic("mount_refdrain: dangling vnode");
return(0);
}
+/* Tags the mount point as not supportine extended readdir for NFS exports */
+void
+mount_set_noreaddirext(mount_t mp) {
+ mount_lock (mp);
+ mp->mnt_kern_flag |= MNTK_DENY_READDIREXT;
+ mount_unlock (mp);
+}
/*
* Mark a mount point as busy. Used to synchronize access and to delay
restart:
if (mp->mnt_lflag & MNT_LDEAD)
- return(ENOENT);
-
- if (mp->mnt_lflag & MNT_LUNMOUNT) {
- if (flags & LK_NOWAIT)
- return (ENOENT);
+ return (ENOENT);
- mount_lock(mp);
+ mount_lock(mp);
- if (mp->mnt_lflag & MNT_LDEAD) {
+ if (mp->mnt_lflag & MNT_LUNMOUNT) {
+ if (flags & LK_NOWAIT || mp->mnt_lflag & MNT_LDEAD) {
mount_unlock(mp);
- return(ENOENT);
- }
- if (mp->mnt_lflag & MNT_LUNMOUNT) {
- mp->mnt_lflag |= MNT_LWAIT;
- /*
- * Since all busy locks are shared except the exclusive
- * lock granted when unmounting, the only place that a
- * wakeup needs to be done is at the release of the
- * exclusive lock at the end of dounmount.
- */
- msleep((caddr_t)mp, &mp->mnt_mlock, (PVFS | PDROP), "vfsbusy", 0 );
return (ENOENT);
}
- mount_unlock(mp);
+
+ /*
+ * Since all busy locks are shared except the exclusive
+ * lock granted when unmounting, the only place that a
+ * wakeup needs to be done is at the release of the
+ * exclusive lock at the end of dounmount.
+ */
+ mp->mnt_lflag |= MNT_LWAIT;
+ msleep((caddr_t)mp, &mp->mnt_mlock, (PVFS | PDROP), "vfsbusy", NULL);
+ return (ENOENT);
}
+ mount_unlock(mp);
+
lck_rw_lock_shared(&mp->mnt_rwlock);
/*
- * until we are granted the rwlock, it's possible for the mount point to
- * change state, so reevaluate before granting the vfs_busy
+ * Until we are granted the rwlock, it's possible for the mount point to
+ * change state, so re-evaluate before granting the vfs_busy.
*/
if (mp->mnt_lflag & (MNT_LDEAD | MNT_LUNMOUNT)) {
lck_rw_done(&mp->mnt_rwlock);
/*
* Free a busy filesystem.
*/
-
void
vfs_unbusy(mount_t mp)
{
mount_lock_destroy(mp);
+#if CONFIG_MACF
+ mac_mount_label_destroy(mp);
+#endif
+
FREE_ZONE(mp, sizeof(struct mount), M_MOUNT);
}
{
mount_t mp;
- mp = _MALLOC_ZONE((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK);
- bzero((char *)mp, (u_long)sizeof(struct mount));
+ mp = _MALLOC_ZONE(sizeof(struct mount), M_MOUNT, M_WAITOK);
+ bzero((char *)mp, sizeof(struct mount));
/* Initialize the default IO constraints */
mp->mnt_maxreadcnt = mp->mnt_maxwritecnt = MAXPHYS;
mp->mnt_maxsegreadsize = mp->mnt_maxreadcnt;
mp->mnt_maxsegwritesize = mp->mnt_maxwritecnt;
mp->mnt_devblocksize = DEV_BSIZE;
+ mp->mnt_alignmentmask = PAGE_MASK;
+ mp->mnt_ioqueue_depth = MNT_DEFAULT_IOQUEUE_DEPTH;
+ mp->mnt_ioscale = 1;
+ mp->mnt_ioflags = 0;
+ mp->mnt_realrootvp = NULLVP;
+ mp->mnt_authcache_ttl = CACHED_LOOKUP_RIGHT_TTL;
+ mp->mnt_throttle_mask = LOWPRI_MAX_NUM_DEV - 1;
+ mp->mnt_devbsdunit = 0;
mount_lock_init(mp);
(void)vfs_busy(mp, LK_NOWAIT);
vfsp->vfc_refcount++;
mount_list_unlock();
- strncpy(mp->mnt_vfsstat.f_fstypename, vfsp->vfc_name, MFSTYPENAMELEN);
+ strlcpy(mp->mnt_vfsstat.f_fstypename, vfsp->vfc_name, MFSTYPENAMELEN);
mp->mnt_vfsstat.f_mntonname[0] = '/';
- (void) copystr((char *)devname, mp->mnt_vfsstat.f_mntfromname, MAXPATHLEN - 1, 0);
+ /* XXX const poisoning layering violation */
+ (void) copystr((const void *)devname, mp->mnt_vfsstat.f_mntfromname, MAXPATHLEN - 1, NULL);
+#if CONFIG_MACF
+ mac_mount_label_init(mp);
+ mac_mount_label_associate(vfs_context_kernel(), mp);
+#endif
return (mp);
}
struct vfstable *vfsp;
for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
- if (!strcmp(vfsp->vfc_name, fstypename))
+ if (!strncmp(vfsp->vfc_name, fstypename,
+ sizeof(vfsp->vfc_name)))
break;
if (vfsp == NULL)
return (ENODEV);
extern int (*mountroot)(void);
int
-vfs_mountroot()
+vfs_mountroot(void)
{
+#if CONFIG_MACF
+ struct vnode *vp;
+#endif
struct vfstable *vfsp;
- struct vfs_context context;
+ vfs_context_t ctx = vfs_context_kernel();
+ struct vfs_attr vfsattr;
int error;
mount_t mp;
+ vnode_t bdevvp_rootvp;
if (mountroot != NULL) {
- /*
+ /*
* used for netboot which follows a different set of rules
*/
- error = (*mountroot)();
+ error = (*mountroot)();
return (error);
}
if ((error = bdevvp(rootdev, &rootvp))) {
- printf("vfs_mountroot: can't setup bdevvp\n");
+ printf("vfs_mountroot: can't setup bdevvp\n");
return (error);
}
- context.vc_proc = current_proc();
- context.vc_ucred = kauth_cred_get();
+ /*
+ * 4951998 - code we call in vfc_mountroot may replace rootvp
+ * so keep a local copy for some house keeping.
+ */
+ bdevvp_rootvp = rootvp;
for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) {
- if (vfsp->vfc_mountroot == NULL)
+ if (vfsp->vfc_mountroot == NULL
+ && !ISSET(vfsp->vfc_vfsflags, VFC_VFSCANMOUNTROOT)) {
continue;
+ }
mp = vfs_rootmountalloc_internal(vfsp, "root_device");
mp->mnt_devvp = rootvp;
- if ((error = (*vfsp->vfc_mountroot)(mp, rootvp, &context)) == 0) {
- mp->mnt_devvp->v_specflags |= SI_MOUNTEDON;
+ if (vfsp->vfc_mountroot)
+ error = (*vfsp->vfc_mountroot)(mp, rootvp, ctx);
+ else
+ error = VFS_MOUNT(mp, rootvp, 0, ctx);
+
+ if (!error) {
+ if ( bdevvp_rootvp != rootvp ) {
+ /*
+ * rootvp changed...
+ * bump the iocount and fix up mnt_devvp for the
+ * new rootvp (it will already have a usecount taken)...
+ * drop the iocount and the usecount on the orignal
+ * since we are no longer going to use it...
+ */
+ vnode_getwithref(rootvp);
+ mp->mnt_devvp = rootvp;
+
+ vnode_rele(bdevvp_rootvp);
+ vnode_put(bdevvp_rootvp);
+ }
+ mp->mnt_devvp->v_specflags |= SI_MOUNTEDON;
- vfs_unbusy(mp);
+ vfs_unbusy(mp);
mount_list_add(mp);
* defaults will have been set, so no reason to bail or care
*/
vfs_init_io_attributes(rootvp, mp);
+
+ if (mp->mnt_ioflags & MNT_IOFLAGS_FUSION_DRIVE) {
+ root_is_CF_drive = TRUE;
+ }
+
+ /*
+ * Shadow the VFC_VFSNATIVEXATTR flag to MNTK_EXTENDED_ATTRS.
+ */
+ if (mp->mnt_vtable->vfc_vfsflags & VFC_VFSNATIVEXATTR) {
+ mp->mnt_kern_flag |= MNTK_EXTENDED_ATTRS;
+ }
+ if (mp->mnt_vtable->vfc_vfsflags & VFC_VFSPREFLIGHT) {
+ mp->mnt_kern_flag |= MNTK_UNMOUNT_PREFLIGHT;
+ }
+
+#if !CONFIG_EMBEDDED
+ uint32_t speed;
+
+ if (MNTK_VIRTUALDEV & mp->mnt_kern_flag) speed = 128;
+ else if (disk_conditioner_mount_is_ssd(mp)) speed = 7*256;
+ else speed = 256;
+ vc_progress_setdiskspeed(speed);
+#endif
+ /*
+ * Probe root file system for additional features.
+ */
+ (void)VFS_START(mp, 0, ctx);
+
+ VFSATTR_INIT(&vfsattr);
+ VFSATTR_WANTED(&vfsattr, f_capabilities);
+ if (vfs_getattr(mp, &vfsattr, ctx) == 0 &&
+ VFSATTR_IS_SUPPORTED(&vfsattr, f_capabilities)) {
+ if ((vfsattr.f_capabilities.capabilities[VOL_CAPABILITIES_INTERFACES] & VOL_CAP_INT_EXTENDED_ATTR) &&
+ (vfsattr.f_capabilities.valid[VOL_CAPABILITIES_INTERFACES] & VOL_CAP_INT_EXTENDED_ATTR)) {
+ mp->mnt_kern_flag |= MNTK_EXTENDED_ATTRS;
+ }
+#if NAMEDSTREAMS
+ if ((vfsattr.f_capabilities.capabilities[VOL_CAPABILITIES_INTERFACES] & VOL_CAP_INT_NAMEDSTREAMS) &&
+ (vfsattr.f_capabilities.valid[VOL_CAPABILITIES_INTERFACES] & VOL_CAP_INT_NAMEDSTREAMS)) {
+ mp->mnt_kern_flag |= MNTK_NAMED_STREAMS;
+ }
+#endif
+ if ((vfsattr.f_capabilities.capabilities[VOL_CAPABILITIES_FORMAT] & VOL_CAP_FMT_PATH_FROM_ID) &&
+ (vfsattr.f_capabilities.valid[VOL_CAPABILITIES_FORMAT] & VOL_CAP_FMT_PATH_FROM_ID)) {
+ mp->mnt_kern_flag |= MNTK_PATH_FROM_ID;
+ }
+
+ if ((vfsattr.f_capabilities.capabilities[VOL_CAPABILITIES_FORMAT] & VOL_CAP_FMT_DIR_HARDLINKS) &&
+ (vfsattr.f_capabilities.valid[VOL_CAPABILITIES_FORMAT] & VOL_CAP_FMT_DIR_HARDLINKS)) {
+ mp->mnt_kern_flag |= MNTK_DIR_HARDLINKS;
+ }
+ }
+
/*
* get rid of iocount reference returned
- * by bdevvp... it will have also taken
+ * by bdevvp (or picked up by us on the substitued
+ * rootvp)... it (or we) will have also taken
* a usecount reference which we want to keep
*/
vnode_put(rootvp);
+#if CONFIG_MACF
+ if ((vfs_flags(mp) & MNT_MULTILABEL) == 0)
+ return (0);
+
+ error = VFS_ROOT(mp, &vp, ctx);
+ if (error) {
+ printf("%s() VFS_ROOT() returned %d\n",
+ __func__, error);
+ dounmount(mp, MNT_FORCE, 0, ctx);
+ goto fail;
+ }
+ error = vnode_label(mp, NULL, vp, NULL, 0, ctx);
+ /*
+ * get rid of reference provided by VFS_ROOT
+ */
+ vnode_put(vp);
+
+ if (error) {
+ printf("%s() vnode_label() returned %d\n",
+ __func__, error);
+ dounmount(mp, MNT_FORCE, 0, ctx);
+ goto fail;
+ }
+#endif
return (0);
}
+#if CONFIG_MACF
+fail:
+#endif
vfs_rootmountfailed(mp);
if (error != EINVAL)
/*
* Lookup a mount point by filesystem identifier.
*/
-extern mount_t vfs_getvfs_locked(fsid_t *);
struct mount *
-vfs_getvfs(fsid)
- fsid_t *fsid;
+vfs_getvfs(fsid_t *fsid)
{
return (mount_list_lookupby_fsid(fsid, 0, 0));
}
-struct mount *
-vfs_getvfs_locked(fsid)
- fsid_t *fsid;
+static struct mount *
+vfs_getvfs_locked(fsid_t *fsid)
{
return(mount_list_lookupby_fsid(fsid, 1, 0));
}
struct mount *
-vfs_getvfs_by_mntonname(u_char *path)
+vfs_getvfs_by_mntonname(char *path)
{
mount_t retmp = (mount_t)0;
mount_t mp;
mount_list_lock();
TAILQ_FOREACH(mp, &mountlist, mnt_list) {
- if (!strcmp(mp->mnt_vfsstat.f_mntonname, path)) {
+ if (!strncmp(mp->mnt_vfsstat.f_mntonname, path,
+ sizeof(mp->mnt_vfsstat.f_mntonname))) {
retmp = mp;
+ if (mount_iterref(retmp, 1))
+ retmp = NULL;
goto out;
}
}
* Get a new unique fsid
*/
void
-vfs_getnewfsid(mp)
- struct mount *mp;
+vfs_getnewfsid(struct mount *mp)
{
fsid_t tfsid;
int mtype;
- mount_t nmp;
mount_list_lock();
tfsid.val[0] = makedev(nblkdev + mtype, mntid_gen);
tfsid.val[1] = mtype;
- TAILQ_FOREACH(nmp, &mountlist, mnt_list) {
- while (vfs_getvfs_locked(&tfsid)) {
- if (++mntid_gen == 0)
- mntid_gen++;
- tfsid.val[0] = makedev(nblkdev + mtype, mntid_gen);
- }
+ while (vfs_getvfs_locked(&tfsid)) {
+ if (++mntid_gen == 0)
+ mntid_gen++;
+ tfsid.val[0] = makedev(nblkdev + mtype, mntid_gen);
}
+
mp->mnt_vfsstat.f_fsid.val[0] = tfsid.val[0];
mp->mnt_vfsstat.f_fsid.val[1] = tfsid.val[1];
mount_list_unlock();
* Routines having to do with the management of the vnode table.
*/
extern int (**dead_vnodeop_p)(void *);
-long numvnodes, freevnodes;
-long inactivevnodes;
+long numvnodes, freevnodes, deadvnodes, async_work_vnodes;
+
+int async_work_timed_out = 0;
+int async_work_handled = 0;
+int dead_vnode_wanted = 0;
+int dead_vnode_waited = 0;
/*
* Move a vnode from one mount queue to another.
panic("insmntque: vp not in mount vnode list");
vp->v_lflag &= ~VNAMED_MOUNT;
- mount_lock(lmp);
+ mount_lock_spin(lmp);
mount_drop(lmp, 1);
vp->v_mntvnodes.tqe_next->v_mntvnodes.tqe_prev = vp->v_mntvnodes.tqe_prev;
*vp->v_mntvnodes.tqe_prev = vp->v_mntvnodes.tqe_next;
}
- vp->v_mntvnodes.tqe_next = 0;
- vp->v_mntvnodes.tqe_prev = 0;
+ vp->v_mntvnodes.tqe_next = NULL;
+ vp->v_mntvnodes.tqe_prev = NULL;
mount_unlock(lmp);
return;
}
* Insert into list of vnodes for the new mount point, if available.
*/
if ((vp->v_mount = mp) != NULL) {
- mount_lock(mp);
+ mount_lock_spin(mp);
if ((vp->v_mntvnodes.tqe_next != 0) && (vp->v_mntvnodes.tqe_prev != 0))
panic("vp already in mount list");
if (mp->mnt_lflag & MNT_LITER)
TAILQ_INSERT_HEAD(&mp->mnt_vnodelist, vp, v_mntvnodes);
if (vp->v_lflag & VNAMED_MOUNT)
panic("insmntque: vp already in mount vnode list");
- if ((vp->v_freelist.tqe_prev != (struct vnode **)0xdeadb))
- panic("insmntque: vp on the free list\n");
vp->v_lflag |= VNAMED_MOUNT;
mount_ref(mp, 1);
mount_unlock(mp);
return (ENODEV);
}
- context.vc_proc = current_proc();
+ context.vc_thread = current_thread();
context.vc_ucred = FSCRED;
vfsp.vnfs_mp = (struct mount *)0;
vfsp.vnfs_vtype = VBLK;
vfsp.vnfs_str = "bdevvp";
- vfsp.vnfs_dvp = 0;
- vfsp.vnfs_fsnode = 0;
- vfsp.vnfs_cnp = 0;
+ vfsp.vnfs_dvp = NULL;
+ vfsp.vnfs_fsnode = NULL;
+ vfsp.vnfs_cnp = NULL;
vfsp.vnfs_vops = spec_vnodeop_p;
vfsp.vnfs_rdev = dev;
vfsp.vnfs_filesize = 0;
*vpp = NULLVP;
return (error);
}
+ vnode_lock_spin(nvp);
+ nvp->v_flag |= VBDEVVP;
+ nvp->v_tag = VT_NON; /* set this to VT_NON so during aliasing it can be replaced */
+ vnode_unlock(nvp);
if ( (error = vnode_ref(nvp)) ) {
panic("bdevvp failed: vnode_ref");
return (error);
panic("bdevvp failed: invalidateblks");
return (error);
}
+
+#if CONFIG_MACF
+ /*
+ * XXXMAC: We can't put a MAC check here, the system will
+ * panic without this vnode.
+ */
+#endif /* MAC */
+
if ( (error = VNOP_OPEN(nvp, FREAD, &context)) ) {
panic("bdevvp failed: open");
return (error);
* caller is responsible for filling it with its new contents.
*/
static vnode_t
-checkalias(nvp, nvp_rdev)
- register struct vnode *nvp;
- dev_t nvp_rdev;
+checkalias(struct vnode *nvp, dev_t nvp_rdev)
{
struct vnode *vp;
struct vnode **vpp;
+ struct specinfo *sin = NULL;
int vid = 0;
vpp = &speclisth[SPECHASH(nvp_rdev)];
SPECHASH_UNLOCK();
if (vp) {
+found_alias:
if (vnode_getwithvid(vp,vid)) {
goto loop;
}
* Alias, but not in use, so flush it out.
*/
if ((vp->v_iocount == 1) && (vp->v_usecount == 0)) {
- vnode_reclaim_internal(vp, 1, 0);
+ vnode_reclaim_internal(vp, 1, 1, 0);
+ vnode_put_locked(vp);
vnode_unlock(vp);
- vnode_put(vp);
goto loop;
}
+
}
if (vp == NULL || vp->v_tag != VT_NON) {
- MALLOC_ZONE(nvp->v_specinfo, struct specinfo *, sizeof(struct specinfo),
- M_SPECINFO, M_WAITOK);
+ if (sin == NULL) {
+ MALLOC_ZONE(sin, struct specinfo *, sizeof(struct specinfo),
+ M_SPECINFO, M_WAITOK);
+ }
+
+ nvp->v_specinfo = sin;
bzero(nvp->v_specinfo, sizeof(struct specinfo));
nvp->v_rdev = nvp_rdev;
nvp->v_specflags = 0;
nvp->v_speclastr = -1;
+ nvp->v_specinfo->si_opencount = 0;
+ nvp->v_specinfo->si_initted = 0;
+ nvp->v_specinfo->si_throttleable = 0;
SPECHASH_LOCK();
+
+ /* We dropped the lock, someone could have added */
+ if (vp == NULLVP) {
+ for (vp = *vpp; vp; vp = vp->v_specnext) {
+ if (nvp_rdev == vp->v_rdev && nvp->v_type == vp->v_type) {
+ vid = vp->v_id;
+ SPECHASH_UNLOCK();
+ goto found_alias;
+ }
+ }
+ }
+
nvp->v_hashchain = vpp;
nvp->v_specnext = *vpp;
*vpp = nvp;
- SPECHASH_UNLOCK();
if (vp != NULLVP) {
- nvp->v_flag |= VALIASED;
- vp->v_flag |= VALIASED;
+ nvp->v_specflags |= SI_ALIASED;
+ vp->v_specflags |= SI_ALIASED;
+ SPECHASH_UNLOCK();
+ vnode_put_locked(vp);
vnode_unlock(vp);
- vnode_put(vp);
+ } else {
+ SPECHASH_UNLOCK();
}
+
return (NULLVP);
}
+
+ if (sin) {
+ FREE_ZONE(sin, sizeof(struct specinfo), M_SPECINFO);
+ }
+
+ if ((vp->v_flag & (VBDEVVP | VDEVFLUSH)) != 0)
+ return(vp);
+
+ panic("checkalias with VT_NON vp that shouldn't: %p", vp);
+
return (vp);
}
* and an error returned to indicate that the vnode is no longer
* usable (possibly having been changed to a new file system type).
*/
-static int
+int
vget_internal(vnode_t vp, int vid, int vflags)
{
int error = 0;
- u_long vpid;
-
- vnode_lock(vp);
- if (vflags & VNODE_WITHID)
- vpid = vid;
- else
- vpid = vp->v_id; // save off the original v_id
+ vnode_lock_spin(vp);
if ((vflags & VNODE_WRITEABLE) && (vp->v_writecount == 0))
/*
*/
error = EINVAL;
else
- error = vnode_getiocount(vp, 1, vpid, vflags);
+ error = vnode_getiocount(vp, vid, vflags);
vnode_unlock(vp);
return (error);
}
+/*
+ * Returns: 0 Success
+ * ENOENT No such file or directory [terminating]
+ */
int
vnode_ref(vnode_t vp)
{
- return (vnode_ref_ext(vp, 0));
+ return (vnode_ref_ext(vp, 0, 0));
}
+/*
+ * Returns: 0 Success
+ * ENOENT No such file or directory [terminating]
+ */
int
-vnode_ref_ext(vnode_t vp, int fmode)
+vnode_ref_ext(vnode_t vp, int fmode, int flags)
{
int error = 0;
- vnode_lock(vp);
+ vnode_lock_spin(vp);
/*
* once all the current call sites have been fixed to insure they have
* iocount is non-zero... a non-zero usecount doesn't insure correctness
*/
if (vp->v_iocount <= 0 && vp->v_usecount <= 0)
- panic("vnode_ref_ext: vp %x has no valid reference %d, %d", vp, vp->v_iocount, vp->v_usecount);
+ panic("vnode_ref_ext: vp %p has no valid reference %d, %d", vp, vp->v_iocount, vp->v_usecount);
/*
* if you are the owner of drain/termination, can acquire usecount
*/
- if ((vp->v_lflag & (VL_DRAIN | VL_TERMINATE | VL_DEAD))) {
- if (vp->v_owner != current_thread()) {
- error = ENOENT;
- goto out;
+ if ((flags & VNODE_REF_FORCE) == 0) {
+ if ((vp->v_lflag & (VL_DRAIN | VL_TERMINATE | VL_DEAD))) {
+ if (vp->v_owner != current_thread()) {
+ error = ENOENT;
+ goto out;
+ }
}
}
vp->v_usecount++;
if (++vp->v_kusecount <= 0)
panic("vnode_ref_ext: v_kusecount");
}
+ if (vp->v_flag & VRAGE) {
+ struct uthread *ut;
+
+ ut = get_bsdthread_info(current_thread());
+
+ if ( !(current_proc()->p_lflag & P_LRAGE_VNODES) &&
+ !(ut->uu_flag & UT_RAGE_VNODES)) {
+ /*
+ * a 'normal' process accessed this vnode
+ * so make sure its no longer marked
+ * for rapid aging... also, make sure
+ * it gets removed from the rage list...
+ * when v_usecount drops back to 0, it
+ * will be put back on the real free list
+ */
+ vp->v_flag &= ~VRAGE;
+ vp->v_references = 0;
+ vnode_list_remove(vp);
+ }
+ }
+ if (vp->v_usecount == 1 && vp->v_type == VREG && !(vp->v_flag & VSYSTEM)) {
+
+ if (vp->v_ubcinfo) {
+ vnode_lock_convert(vp);
+ memory_object_mark_used(vp->v_ubcinfo->ui_control);
+ }
+ }
out:
vnode_unlock(vp);
}
-/*
- * put the vnode on appropriate free list.
- * called with vnode LOCKED
- */
-static void
-vnode_list_add(vnode_t vp)
+boolean_t
+vnode_on_reliable_media(vnode_t vp)
{
+ if ( !(vp->v_mount->mnt_kern_flag & MNTK_VIRTUALDEV) && (vp->v_mount->mnt_flag & MNT_LOCAL) )
+ return (TRUE);
+ return (FALSE);
+}
- /*
- * if it is already on a list or non zero references return
- */
- if (VONLIST(vp) || (vp->v_usecount != 0) || (vp->v_iocount != 0))
- return;
+static void
+vnode_async_list_add(vnode_t vp)
+{
vnode_list_lock();
+ if (VONLIST(vp) || (vp->v_lflag & (VL_TERMINATE|VL_DEAD)))
+ panic("vnode_async_list_add: %p is in wrong state", vp);
+
+ TAILQ_INSERT_HEAD(&vnode_async_work_list, vp, v_freelist);
+ vp->v_listflag |= VLIST_ASYNC_WORK;
+
+ async_work_vnodes++;
+
+ vnode_list_unlock();
+
+ wakeup(&vnode_async_work_list);
+
+}
+
+
+/*
+ * put the vnode on appropriate free list.
+ * called with vnode LOCKED
+ */
+static void
+vnode_list_add(vnode_t vp)
+{
+ boolean_t need_dead_wakeup = FALSE;
+
+#if DIAGNOSTIC
+ lck_mtx_assert(&vp->v_lock, LCK_MTX_ASSERT_OWNED);
+#endif
+
+again:
+
/*
- * insert at tail of LRU list or at head if VAGE or VL_DEAD is set
+ * if it is already on a list or non zero references return
*/
- if ((vp->v_flag & VAGE) || (vp->v_lflag & VL_DEAD)) {
- TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist);
- vp->v_flag &= ~VAGE;
- } else {
- TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist);
+ if (VONLIST(vp) || (vp->v_usecount != 0) || (vp->v_iocount != 0) || (vp->v_lflag & VL_TERMINATE))
+ return;
+
+ /*
+ * In vclean, we might have deferred ditching locked buffers
+ * because something was still referencing them (indicated by
+ * usecount). We can ditch them now.
+ */
+ if (ISSET(vp->v_lflag, VL_DEAD)
+ && (!LIST_EMPTY(&vp->v_cleanblkhd) || !LIST_EMPTY(&vp->v_dirtyblkhd))) {
+ ++vp->v_iocount; // Probably not necessary, but harmless
+#ifdef JOE_DEBUG
+ record_vp(vp, 1);
+#endif
+ vnode_unlock(vp);
+ buf_invalidateblks(vp, BUF_INVALIDATE_LOCKED, 0, 0);
+ vnode_lock(vp);
+ vnode_dropiocount(vp);
+ goto again;
}
- freevnodes++;
+ vnode_list_lock();
+
+ if ((vp->v_flag & VRAGE) && !(vp->v_lflag & VL_DEAD)) {
+ /*
+ * add the new guy to the appropriate end of the RAGE list
+ */
+ if ((vp->v_flag & VAGE))
+ TAILQ_INSERT_HEAD(&vnode_rage_list, vp, v_freelist);
+ else
+ TAILQ_INSERT_TAIL(&vnode_rage_list, vp, v_freelist);
+
+ vp->v_listflag |= VLIST_RAGE;
+ ragevnodes++;
+
+ /*
+ * reset the timestamp for the last inserted vp on the RAGE
+ * queue to let new_vnode know that its not ok to start stealing
+ * from this list... as long as we're actively adding to this list
+ * we'll push out the vnodes we want to donate to the real free list
+ * once we stop pushing, we'll let some time elapse before we start
+ * stealing them in the new_vnode routine
+ */
+ microuptime(&rage_tv);
+ } else {
+ /*
+ * if VL_DEAD, insert it at head of the dead list
+ * else insert at tail of LRU list or at head if VAGE is set
+ */
+ if ( (vp->v_lflag & VL_DEAD)) {
+ TAILQ_INSERT_HEAD(&vnode_dead_list, vp, v_freelist);
+ vp->v_listflag |= VLIST_DEAD;
+ deadvnodes++;
+
+ if (dead_vnode_wanted) {
+ dead_vnode_wanted--;
+ need_dead_wakeup = TRUE;
+ }
+
+ } else if ( (vp->v_flag & VAGE) ) {
+ TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist);
+ vp->v_flag &= ~VAGE;
+ freevnodes++;
+ } else {
+ TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist);
+ freevnodes++;
+ }
+ }
vnode_list_unlock();
+
+ if (need_dead_wakeup == TRUE)
+ wakeup_one((caddr_t)&dead_vnode_wanted);
+}
+
+
+/*
+ * remove the vnode from appropriate free list.
+ * called with vnode LOCKED and
+ * the list lock held
+ */
+static void
+vnode_list_remove_locked(vnode_t vp)
+{
+ if (VONLIST(vp)) {
+ /*
+ * the v_listflag field is
+ * protected by the vnode_list_lock
+ */
+ if (vp->v_listflag & VLIST_RAGE)
+ VREMRAGE("vnode_list_remove", vp);
+ else if (vp->v_listflag & VLIST_DEAD)
+ VREMDEAD("vnode_list_remove", vp);
+ else if (vp->v_listflag & VLIST_ASYNC_WORK)
+ VREMASYNC_WORK("vnode_list_remove", vp);
+ else
+ VREMFREE("vnode_list_remove", vp);
+ }
}
+
/*
* remove the vnode from appropriate free list.
+ * called with vnode LOCKED
*/
static void
vnode_list_remove(vnode_t vp)
{
+#if DIAGNOSTIC
+ lck_mtx_assert(&vp->v_lock, LCK_MTX_ASSERT_OWNED);
+#endif
/*
* we want to avoid taking the list lock
* in the case where we're not on the free
/*
* however, we're not guaranteed that
* we won't go from the on-list state
- * to the non-on-list state until we
+ * to the not-on-list state until we
* hold the vnode_list_lock... this
- * is due to new_vnode removing vnodes
+ * is due to "new_vnode" removing vnodes
* from the free list uder the list_lock
* w/o the vnode lock... so we need to
* check again whether we're currently
* on the free list
*/
- if (VONLIST(vp)) {
- VREMFREE("vnode_list_remove", vp);
- VLISTNONE(vp);
- }
+ vnode_list_remove_locked(vp);
+
vnode_list_unlock();
}
}
void
vnode_rele_internal(vnode_t vp, int fmode, int dont_reenter, int locked)
{
- struct vfs_context context;
if ( !locked)
- vnode_lock(vp);
-
+ vnode_lock_spin(vp);
+#if DIAGNOSTIC
+ else
+ lck_mtx_assert(&vp->v_lock, LCK_MTX_ASSERT_OWNED);
+#endif
if (--vp->v_usecount < 0)
- panic("vnode_rele_ext: vp %x usecount -ve : %d", vp, vp->v_usecount);
+ panic("vnode_rele_ext: vp %p usecount -ve : %d. v_tag = %d, v_type = %d, v_flag = %x.", vp, vp->v_usecount, vp->v_tag, vp->v_type, vp->v_flag);
if (fmode & FWRITE) {
- if (--vp->v_writecount < 0)
- panic("vnode_rele_ext: vp %x writecount -ve : %d", vp, vp->v_writecount);
+ if (--vp->v_writecount < 0)
+ panic("vnode_rele_ext: vp %p writecount -ve : %d. v_tag = %d, v_type = %d, v_flag = %x.", vp, vp->v_writecount, vp->v_tag, vp->v_type, vp->v_flag);
}
if (fmode & O_EVTONLY) {
if (--vp->v_kusecount < 0)
- panic("vnode_rele_ext: vp %x kusecount -ve : %d", vp, vp->v_kusecount);
+ panic("vnode_rele_ext: vp %p kusecount -ve : %d. v_tag = %d, v_type = %d, v_flag = %x.", vp, vp->v_kusecount, vp->v_tag, vp->v_type, vp->v_flag);
}
+ if (vp->v_kusecount > vp->v_usecount)
+ panic("vnode_rele_ext: vp %p kusecount(%d) out of balance with usecount(%d). v_tag = %d, v_type = %d, v_flag = %x.",vp, vp->v_kusecount, vp->v_usecount, vp->v_tag, vp->v_type, vp->v_flag);
+
if ((vp->v_iocount > 0) || (vp->v_usecount > 0)) {
- /*
+ /*
* vnode is still busy... if we're the last
* usecount, mark for a future call to VNOP_INACTIVE
* when the iocount finally drops to 0
*/
- if (vp->v_usecount == 0) {
- vp->v_lflag |= VL_NEEDINACTIVE;
- vp->v_flag &= ~(VNOCACHE_DATA | VRAOFF);
+ if (vp->v_usecount == 0) {
+ vp->v_lflag |= VL_NEEDINACTIVE;
+ vp->v_flag &= ~(VNOCACHE_DATA | VRAOFF | VOPENEVT);
}
- if ( !locked)
- vnode_unlock(vp);
- return;
+ goto done;
}
- vp->v_flag &= ~(VNOCACHE_DATA | VRAOFF);
+ vp->v_flag &= ~(VNOCACHE_DATA | VRAOFF | VOPENEVT);
- if ( (vp->v_lflag & (VL_TERMINATE | VL_DEAD)) || dont_reenter) {
- /*
+ if (ISSET(vp->v_lflag, VL_TERMINATE | VL_DEAD) || dont_reenter) {
+ /*
* vnode is being cleaned, or
* we've requested that we don't reenter
- * the filesystem on this release... in
- * this case, we'll mark the vnode aged
- * if it's been marked for termination
+ * the filesystem on this release...in
+ * the latter case, we'll mark the vnode aged
*/
- if (dont_reenter) {
- if ( !(vp->v_lflag & (VL_TERMINATE | VL_DEAD | VL_MARKTERM)) )
- vp->v_lflag |= VL_NEEDINACTIVE;
- vp->v_flag |= VAGE;
+ if (dont_reenter) {
+ if ( !(vp->v_lflag & (VL_TERMINATE | VL_DEAD | VL_MARKTERM)) ) {
+ vp->v_lflag |= VL_NEEDINACTIVE;
+
+ if (vnode_on_reliable_media(vp) == FALSE || vp->v_flag & VISDIRTY) {
+ vnode_async_list_add(vp);
+ goto done;
+ }
+ }
+ vp->v_flag |= VAGE;
}
- vnode_list_add(vp);
- if ( !locked)
- vnode_unlock(vp);
- return;
+ vnode_list_add(vp);
+
+ goto done;
}
/*
* at this point both the iocount and usecount
vp->v_lflag &= ~VL_NEEDINACTIVE;
vnode_unlock(vp);
- context.vc_proc = current_proc();
- context.vc_ucred = kauth_cred_get();
- VNOP_INACTIVE(vp, &context);
+ VNOP_INACTIVE(vp, vfs_context_current());
- vnode_lock(vp);
+ vnode_lock_spin(vp);
/*
* because we dropped the vnode lock to call VNOP_INACTIVE
* the state of the vnode may have changed... we may have
if (ut->uu_defer_reclaims) {
vp->v_defer_reclaimlist = ut->uu_vreclaims;
- ut->uu_vreclaims = vp;
- goto defer_reclaim;
+ ut->uu_vreclaims = vp;
+ goto done;
}
- vnode_reclaim_internal(vp, 1, 0);
+ vnode_lock_convert(vp);
+ vnode_reclaim_internal(vp, 1, 1, 0);
}
- vnode_dropiocount(vp, 1);
+ vnode_dropiocount(vp);
vnode_list_add(vp);
-defer_reclaim:
+done:
+ if (vp->v_usecount == 0 && vp->v_type == VREG && !(vp->v_flag & VSYSTEM)) {
+
+ if (vp->v_ubcinfo) {
+ vnode_lock_convert(vp);
+ memory_object_mark_unused(vp->v_ubcinfo->ui_control, (vp->v_flag & VRAGE) == VRAGE);
+ }
+ }
if ( !locked)
vnode_unlock(vp);
return;
*/
#if DIAGNOSTIC
int busyprt = 0; /* print out busy vnodes */
-#if 0
-struct ctldebug debug1 = { "busyprt", &busyprt };
-#endif /* 0 */
#endif
int
-vflush(mp, skipvp, flags)
- struct mount *mp;
- struct vnode *skipvp;
- int flags;
+vflush(struct mount *mp, struct vnode *skipvp, int flags)
{
- struct proc *p = current_proc();
struct vnode *vp;
int busy = 0;
int reclaimed = 0;
- int vid, retval;
+ int retval;
+ unsigned int vid;
+
+ /*
+ * See comments in vnode_iterate() for the rationale for this lock
+ */
+ mount_iterate_lock(mp);
mount_lock(mp);
vnode_iterate_setup(mp);
* tries unmounting every so often to see whether
* it is still busy or not.
*/
- if ((flags & FORCECLOSE)==0) {
+ if (((flags & FORCECLOSE)==0) && ((mp->mnt_kern_flag & MNTK_UNMOUNT_PREFLIGHT) != 0)) {
if (vnode_umount_preflight(mp, skipvp, flags)) {
vnode_iterate_clear(mp);
mount_unlock(mp);
+ mount_iterate_unlock(mp);
return(EBUSY);
}
}
loop:
- /* it is returns 0 then there is nothing to do */
+ /* If it returns 0 then there is nothing to do */
retval = vnode_iterate_prepare(mp);
if (retval == 0) {
vnode_iterate_clear(mp);
mount_unlock(mp);
+ mount_iterate_unlock(mp);
return(retval);
}
- /* iterate over all the vnodes */
- while (!TAILQ_EMPTY(&mp->mnt_workerqueue)) {
- vp = TAILQ_FIRST(&mp->mnt_workerqueue);
- TAILQ_REMOVE(&mp->mnt_workerqueue, vp, v_mntvnodes);
- TAILQ_INSERT_TAIL(&mp->mnt_vnodelist, vp, v_mntvnodes);
- if ( (vp->v_mount != mp) || (vp == skipvp)) {
- continue;
- }
- vid = vp->v_id;
- mount_unlock(mp);
- vnode_lock(vp);
+ /* iterate over all the vnodes */
+ while (!TAILQ_EMPTY(&mp->mnt_workerqueue)) {
+
+ vp = TAILQ_FIRST(&mp->mnt_workerqueue);
+ TAILQ_REMOVE(&mp->mnt_workerqueue, vp, v_mntvnodes);
+ TAILQ_INSERT_TAIL(&mp->mnt_vnodelist, vp, v_mntvnodes);
+
+ if ( (vp->v_mount != mp) || (vp == skipvp)) {
+ continue;
+ }
+ vid = vp->v_id;
+ mount_unlock(mp);
+
+ vnode_lock_spin(vp);
+
+ // If vnode is already terminating, wait for it...
+ while (vp->v_id == vid && ISSET(vp->v_lflag, VL_TERMINATE)) {
+ vp->v_lflag |= VL_TERMWANT;
+ msleep(&vp->v_lflag, &vp->v_lock, PVFS, "vflush", NULL);
+ }
- if ((vp->v_id != vid) || ((vp->v_lflag & (VL_DEAD | VL_TERMINATE)))) {
+ if ((vp->v_id != vid) || ISSET(vp->v_lflag, VL_DEAD)) {
vnode_unlock(vp);
mount_lock(mp);
continue;
continue;
}
/*
- * If requested, skip over vnodes marked VSWAP.
+ * If requested, skip over vnodes marked VROOT.
*/
if ((flags & SKIPROOT) && (vp->v_flag & VROOT)) {
vnode_unlock(vp);
*/
if (((vp->v_usecount == 0) ||
((vp->v_usecount - vp->v_kusecount) == 0))) {
+
+ vnode_lock_convert(vp);
vp->v_iocount++; /* so that drain waits for * other iocounts */
#ifdef JOE_DEBUG
record_vp(vp, 1);
#endif
- vnode_reclaim_internal(vp, 1, 0);
- vnode_dropiocount(vp, 1);
+ vnode_reclaim_internal(vp, 1, 1, 0);
+ vnode_dropiocount(vp);
vnode_list_add(vp);
-
vnode_unlock(vp);
+
reclaimed++;
mount_lock(mp);
continue;
* anonymous device. For all other files, just kill them.
*/
if (flags & FORCECLOSE) {
+ vnode_lock_convert(vp);
+
if (vp->v_type != VBLK && vp->v_type != VCHR) {
vp->v_iocount++; /* so that drain waits * for other iocounts */
#ifdef JOE_DEBUG
record_vp(vp, 1);
#endif
- vnode_reclaim_internal(vp, 1, 0);
- vnode_dropiocount(vp, 1);
+ vnode_abort_advlocks(vp);
+ vnode_reclaim_internal(vp, 1, 1, 0);
+ vnode_dropiocount(vp);
vnode_list_add(vp);
vnode_unlock(vp);
} else {
- vclean(vp, 0, p);
+ vclean(vp, 0);
vp->v_lflag &= ~VL_DEAD;
vp->v_op = spec_vnodeop_p;
+ vp->v_flag |= VDEVFLUSH;
vnode_unlock(vp);
}
mount_lock(mp);
}
vnode_iterate_clear(mp);
mount_unlock(mp);
+ mount_iterate_unlock(mp);
if (busy && ((flags & FORCECLOSE)==0))
return (EBUSY);
return (0);
}
-int num_recycledvnodes=0;
+long num_recycledvnodes = 0;
/*
* Disassociate the underlying file system from a vnode.
* The vnode lock is held on entry.
*/
static void
-vclean(vnode_t vp, int flags, proc_t p)
+vclean(vnode_t vp, int flags)
{
- struct vfs_context context;
+ vfs_context_t ctx = vfs_context_current();
int active;
int need_inactive;
int already_terminating;
- kauth_cred_t ucred = NULL;
-
- context.vc_proc = p;
- context.vc_ucred = kauth_cred_get();
+ int clflags = 0;
+#if NAMEDSTREAMS
+ int is_namedstream;
+#endif
/*
* Check to see if the vnode is in use.
vp->v_lflag |= VL_TERMINATE;
- /*
- * remove the vnode from any mount list
- * it might be on...
- */
- insmntque(vp, (struct mount *)0);
-
- ucred = vp->v_cred;
- vp->v_cred = NOCRED;
+#if NAMEDSTREAMS
+ is_namedstream = vnode_isnamedstream(vp);
+#endif
vnode_unlock(vp);
- if (IS_VALID_CRED(ucred))
- kauth_cred_unref(&ucred);
-
- OSAddAtomic(1, &num_recycledvnodes);
- /*
- * purge from the name cache as early as possible...
- */
- cache_purge(vp);
+ OSAddAtomicLong(1, &num_recycledvnodes);
+ if (flags & DOCLOSE)
+ clflags |= IO_NDELAY;
+ if (flags & REVOKEALL)
+ clflags |= IO_REVOKE;
+
if (active && (flags & DOCLOSE))
- VNOP_CLOSE(vp, IO_NDELAY, &context);
+ VNOP_CLOSE(vp, clflags, ctx);
/*
* Clean out any buffers associated with the vnode.
if (flags & DOCLOSE) {
#if NFSCLIENT
if (vp->v_tag == VT_NFS)
- nfs_vinvalbuf(vp, V_SAVE, NOCRED, p, 0);
+ nfs_vinvalbuf(vp, V_SAVE, ctx, 0);
else
#endif
{
- VNOP_FSYNC(vp, MNT_WAIT, &context);
- buf_invalidateblks(vp, BUF_WRITE_DATA, 0, 0);
+ VNOP_FSYNC(vp, MNT_WAIT, ctx);
+
+ /*
+ * If the vnode is still in use (by the journal for
+ * example) we don't want to invalidate locked buffers
+ * here. In that case, either the journal will tidy them
+ * up, or we will deal with it when the usecount is
+ * finally released in vnode_rele_internal.
+ */
+ buf_invalidateblks(vp, BUF_WRITE_DATA | (active ? 0 : BUF_INVALIDATE_LOCKED), 0, 0);
}
if (UBCINFOEXISTS(vp))
/*
* Clean the pages in VM.
*/
- (void)ubc_sync_range(vp, (off_t)0, ubc_getsize(vp), UBC_PUSHALL);
+ (void)ubc_msync(vp, (off_t)0, ubc_getsize(vp), NULL, UBC_PUSHALL | UBC_INVALIDATE | UBC_SYNC);
}
- if (UBCINFOEXISTS(vp))
- cluster_release(vp->v_ubcinfo);
-
if (active || need_inactive)
- VNOP_INACTIVE(vp, &context);
+ VNOP_INACTIVE(vp, ctx);
+
+#if NAMEDSTREAMS
+ if ((is_namedstream != 0) && (vp->v_parent != NULLVP)) {
+ vnode_t pvp = vp->v_parent;
+
+ /* Delete the shadow stream file before we reclaim its vnode */
+ if (vnode_isshadow(vp)) {
+ vnode_relenamedstream(pvp, vp);
+ }
+
+ /*
+ * No more streams associated with the parent. We
+ * have a ref on it, so its identity is stable.
+ * If the parent is on an opaque volume, then we need to know
+ * whether it has associated named streams.
+ */
+ if (vfs_authopaque(pvp->v_mount)) {
+ vnode_lock_spin(pvp);
+ pvp->v_lflag &= ~VL_HASSTREAMS;
+ vnode_unlock(pvp);
+ }
+ }
+#endif
- /* Destroy ubc named reference */
+ /*
+ * Destroy ubc named reference
+ * cluster_release is done on this path
+ * along with dropping the reference on the ucred
+ * (and in the case of forced unmount of an mmap-ed file,
+ * the ubc reference on the vnode is dropped here too).
+ */
ubc_destroy_named(vp);
+#if CONFIG_TRIGGERS
+ /*
+ * cleanup trigger info from vnode (if any)
+ */
+ if (vp->v_resolve)
+ vnode_resolver_detach(vp);
+#endif
+
/*
* Reclaim the vnode.
*/
- if (VNOP_RECLAIM(vp, &context))
+ if (VNOP_RECLAIM(vp, ctx))
panic("vclean: cannot reclaim");
// make sure the name & parent ptrs get cleaned out!
- vnode_update_identity(vp, NULLVP, NULL, 0, 0, VNODE_UPDATE_PARENT | VNODE_UPDATE_NAME);
+ vnode_update_identity(vp, NULLVP, NULL, 0, 0, VNODE_UPDATE_PARENT | VNODE_UPDATE_NAME | VNODE_UPDATE_PURGE);
vnode_lock(vp);
+ /*
+ * Remove the vnode from any mount list it might be on. It is not
+ * safe to do this any earlier because unmount needs to wait for
+ * any vnodes to terminate and it cannot do that if it cannot find
+ * them.
+ */
+ insmntque(vp, (struct mount *)0);
+
vp->v_mount = dead_mountp;
vp->v_op = dead_vnodeop_p;
vp->v_tag = VT_NON;
vp->v_data = NULL;
vp->v_lflag |= VL_DEAD;
+ vp->v_flag &= ~VISDIRTY;
if (already_terminating == 0) {
vp->v_lflag &= ~VL_TERMINATE;
* and with all vnodes aliased to the requested vnode.
*/
int
+#if DIAGNOSTIC
vn_revoke(vnode_t vp, int flags, __unused vfs_context_t a_context)
+#else
+vn_revoke(vnode_t vp, __unused int flags, __unused vfs_context_t a_context)
+#endif
{
struct vnode *vq;
int vid;
panic("vnop_revoke");
#endif
- if (vp->v_flag & VALIASED) {
+ if (vnode_isaliased(vp)) {
/*
* If a vgone (or vclean) is already in progress,
- * wait until it is done and return.
+ * return an immediate error
*/
- vnode_lock(vp);
- if (vp->v_lflag & VL_TERMINATE) {
- vnode_unlock(vp);
+ if (vp->v_lflag & VL_TERMINATE)
return(ENOENT);
- }
- vnode_unlock(vp);
+
/*
* Ensure that vp will not be vgone'd while we
* are eliminating its aliases.
*/
SPECHASH_LOCK();
- while (vp->v_flag & VALIASED) {
+ while ((vp->v_specflags & SI_ALIASED)) {
for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
if (vq->v_rdev != vp->v_rdev ||
vq->v_type != vp->v_type || vp == vq)
SPECHASH_LOCK();
break;
}
- vnode_reclaim_internal(vq, 0, 0);
- vnode_put(vq);
+ vnode_lock(vq);
+ if (!(vq->v_lflag & VL_TERMINATE)) {
+ vnode_reclaim_internal(vq, 1, 1, 0);
+ }
+ vnode_put_locked(vq);
+ vnode_unlock(vq);
SPECHASH_LOCK();
break;
}
}
SPECHASH_UNLOCK();
}
- vnode_reclaim_internal(vp, 0, 0);
+ vnode_lock(vp);
+ if (vp->v_lflag & VL_TERMINATE) {
+ vnode_unlock(vp);
+ return (ENOENT);
+ }
+ vnode_reclaim_internal(vp, 1, 0, REVOKEALL);
+ vnode_unlock(vp);
return (0);
}
* Release the passed interlock if the vnode will be recycled.
*/
int
-vnode_recycle(vp)
- struct vnode *vp;
+vnode_recycle(struct vnode *vp)
{
- vnode_lock(vp);
+ vnode_lock_spin(vp);
if (vp->v_iocount || vp->v_usecount) {
vp->v_lflag |= VL_MARKTERM;
vnode_unlock(vp);
return(0);
}
- vnode_reclaim_internal(vp, 1, 0);
+ vnode_lock_convert(vp);
+ vnode_reclaim_internal(vp, 1, 0, 0);
+
vnode_unlock(vp);
return (1);
static int
vnode_reload(vnode_t vp)
{
- vnode_lock(vp);
+ vnode_lock_spin(vp);
if ((vp->v_iocount > 1) || vp->v_usecount) {
vnode_unlock(vp);
static void
-vgone(vnode_t vp)
+vgone(vnode_t vp, int flags)
{
struct vnode *vq;
struct vnode *vx;
* vclean also takes care of removing the
* vnode from any mount list it might be on
*/
- vclean(vp, DOCLOSE, current_proc());
+ vclean(vp, flags | DOCLOSE);
/*
* If special device, remove it from special device alias list
if (vq == NULL)
panic("missing bdev");
}
- if (vp->v_flag & VALIASED) {
+ if (vp->v_specflags & SI_ALIASED) {
vx = NULL;
for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
if (vq->v_rdev != vp->v_rdev ||
if (vx == NULL)
panic("missing alias");
if (vq == NULL)
- vx->v_flag &= ~VALIASED;
- vp->v_flag &= ~VALIASED;
+ vx->v_specflags &= ~SI_ALIASED;
+ vp->v_specflags &= ~SI_ALIASED;
}
SPECHASH_UNLOCK();
{
SPECHASH_UNLOCK();
if (vnode_getwithvid(vp,vid))
goto loop;
- vnode_lock(vp);
+ vnode_lock_spin(vp);
if ((vp->v_usecount > 0) || (vp->v_iocount > 1)) {
vnode_unlock(vp);
if ((*errorp = vfs_mountedon(vp)) != 0)
int count;
int vid;
+ if (!vnode_isspec(vp)) {
+ return (vp->v_usecount - vp->v_kusecount);
+ }
+
loop:
- if ((vp->v_flag & VALIASED) == 0)
- return (vp->v_usecount - vp->v_kusecount);
+ if (!vnode_isaliased(vp))
+ return (vp->v_specinfo->si_opencount);
+ count = 0;
SPECHASH_LOCK();
- for (count = 0, vq = *vp->v_hashchain; vq; vq = vnext) {
- vnext = vq->v_specnext;
- if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type)
- continue;
- vid = vq->v_id;
- SPECHASH_UNLOCK();
+ /*
+ * Grab first vnode and its vid.
+ */
+ vq = *vp->v_hashchain;
+ vid = vq ? vq->v_id : 0;
+
+ SPECHASH_UNLOCK();
+ while (vq) {
+ /*
+ * Attempt to get the vnode outside the SPECHASH lock.
+ */
if (vnode_getwithvid(vq, vid)) {
goto loop;
}
- /*
- * Alias, but not in use, so flush it out.
- */
vnode_lock(vq);
- if ((vq->v_usecount == 0) && (vq->v_iocount == 1) && vq != vp) {
- vnode_reclaim_internal(vq, 1, 0);
- vnode_unlock(vq);
- vnode_put(vq);
- goto loop;
+
+ if (vq->v_rdev == vp->v_rdev && vq->v_type == vp->v_type) {
+ if ((vq->v_usecount == 0) && (vq->v_iocount == 1) && vq != vp) {
+ /*
+ * Alias, but not in use, so flush it out.
+ */
+ vnode_reclaim_internal(vq, 1, 1, 0);
+ vnode_put_locked(vq);
+ vnode_unlock(vq);
+ goto loop;
+ }
+ count += vq->v_specinfo->si_opencount;
}
- count += (vq->v_usecount - vq->v_kusecount);
vnode_unlock(vq);
- vnode_put(vq);
SPECHASH_LOCK();
+ /*
+ * must do this with the reference still held on 'vq'
+ * so that it can't be destroyed while we're poking
+ * through v_specnext
+ */
+ vnext = vq->v_specnext;
+ vid = vnext ? vnext->v_id : 0;
+
+ SPECHASH_UNLOCK();
+
+ vnode_put(vq);
+
+ vq = vnext;
}
- SPECHASH_UNLOCK();
return (count);
}
/*
* Print out a description of a vnode.
*/
-static char *typename[] =
+static const char *typename[] =
{ "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" };
void
typename[vp->v_type], vp->v_usecount, vp->v_writecount);
sbuf[0] = '\0';
if (vp->v_flag & VROOT)
- strcat(sbuf, "|VROOT");
+ strlcat(sbuf, "|VROOT", sizeof(sbuf));
if (vp->v_flag & VTEXT)
- strcat(sbuf, "|VTEXT");
+ strlcat(sbuf, "|VTEXT", sizeof(sbuf));
if (vp->v_flag & VSYSTEM)
- strcat(sbuf, "|VSYSTEM");
+ strlcat(sbuf, "|VSYSTEM", sizeof(sbuf));
if (vp->v_flag & VNOFLUSH)
- strcat(sbuf, "|VNOFLUSH");
+ strlcat(sbuf, "|VNOFLUSH", sizeof(sbuf));
if (vp->v_flag & VBWAIT)
- strcat(sbuf, "|VBWAIT");
- if (vp->v_flag & VALIASED)
- strcat(sbuf, "|VALIASED");
+ strlcat(sbuf, "|VBWAIT", sizeof(sbuf));
+ if (vnode_isaliased(vp))
+ strlcat(sbuf, "|VALIASED", sizeof(sbuf));
if (sbuf[0] != '\0')
printf(" flags (%s)", &sbuf[1]);
}
int
vn_getpath(struct vnode *vp, char *pathbuf, int *len)
{
- return build_path(vp, pathbuf, *len, len);
+ return build_path(vp, pathbuf, *len, len, BUILDPATH_NO_FS_ENTER, vfs_context_current());
+}
+
+int
+vn_getpath_fsenter(struct vnode *vp, char *pathbuf, int *len)
+{
+ return build_path(vp, pathbuf, *len, len, 0, vfs_context_current());
+}
+
+/*
+ * vn_getpath_fsenter_with_parent will reenter the file system to fine the path of the
+ * vnode. It requires that there are IO counts on both the vnode and the directory vnode.
+ *
+ * vn_getpath_fsenter is called by MAC hooks to authorize operations for every thing, but
+ * unlink, rmdir and rename. For these operation the MAC hook calls vn_getpath. This presents
+ * problems where if the path can not be found from the name cache, those operations can
+ * erroneously fail with EPERM even though the call should succeed. When removing or moving
+ * file system objects with operations such as unlink or rename, those operations need to
+ * take IO counts on the target and containing directory. Calling vn_getpath_fsenter from a
+ * MAC hook from these operations during forced unmount operations can lead to dead
+ * lock. This happens when the operation starts, IO counts are taken on the containing
+ * directories and targets. Before the MAC hook is called a forced unmount from another
+ * thread takes place and blocks on the on going operation's directory vnode in vdrain.
+ * After which, the MAC hook gets called and calls vn_getpath_fsenter. vn_getpath_fsenter
+ * is called with the understanding that there is an IO count on the target. If in
+ * build_path the directory vnode is no longer in the cache, then the parent object id via
+ * vnode_getattr from the target is obtain and used to call VFS_VGET to get the parent
+ * vnode. The file system's VFS_VGET then looks up by inode in its hash and tries to get
+ * an IO count. But VFS_VGET "sees" the directory vnode is in vdrain and can block
+ * depending on which version and how it calls the vnode_get family of interfaces.
+ *
+ * N.B. A reasonable interface to use is vnode_getwithvid. This interface was modified to
+ * call vnode_getiocount with VNODE_DRAINO, so it will happily get an IO count and not
+ * cause issues, but there is no guarantee that all or any file systems are doing that.
+ *
+ * vn_getpath_fsenter_with_parent can enter the file system safely since there is a known
+ * IO count on the directory vnode by calling build_path_with_parent.
+ */
+
+int
+vn_getpath_fsenter_with_parent(struct vnode *dvp, struct vnode *vp, char *pathbuf, int *len)
+{
+ return build_path_with_parent(vp, dvp, pathbuf, *len, len, 0, vfs_context_current());
+}
+
+int
+vn_getcdhash(struct vnode *vp, off_t offset, unsigned char *cdhash)
+{
+ return ubc_cs_getcdhash(vp, offset, cdhash);
}
static int max_ext_width;
static int
-extension_cmp(void *a, void *b)
+extension_cmp(const void *a, const void *b)
{
- return (strlen((char *)a) - strlen((char *)b));
+ return (strlen((const char *)a) - strlen((const char *)b));
}
// them (i.e. a short 8 character name can't have an 8
// character extension).
//
+extern lck_mtx_t *pkg_extensions_lck;
+
__private_extern__ int
-set_package_extensions_table(void *data, int nentries, int maxwidth)
+set_package_extensions_table(user_addr_t data, int nentries, int maxwidth)
{
- char *new_exts, *ptr;
- int error, i, len;
+ char *new_exts, *old_exts;
+ int error;
if (nentries <= 0 || nentries > 1024 || maxwidth <= 0 || maxwidth > 255) {
return EINVAL;
}
- MALLOC(new_exts, char *, nentries * maxwidth, M_TEMP, M_WAITOK);
+
+ // allocate one byte extra so we can guarantee null termination
+ MALLOC(new_exts, char *, (nentries * maxwidth) + 1, M_TEMP, M_WAITOK);
+ if (new_exts == NULL) {
+ return ENOMEM;
+ }
- error = copyin(CAST_USER_ADDR_T(data), new_exts, nentries * maxwidth);
+ error = copyin(data, new_exts, nentries * maxwidth);
if (error) {
FREE(new_exts, M_TEMP);
return error;
}
- if (extension_table) {
- FREE(extension_table, M_TEMP);
- }
+ new_exts[(nentries * maxwidth)] = '\0'; // guarantee null termination of the block
+
+ qsort(new_exts, nentries, maxwidth, extension_cmp);
+
+ lck_mtx_lock(pkg_extensions_lck);
+
+ old_exts = extension_table;
extension_table = new_exts;
nexts = nentries;
max_ext_width = maxwidth;
- qsort(extension_table, nexts, maxwidth, extension_cmp);
+ lck_mtx_unlock(pkg_extensions_lck);
+
+ if (old_exts) {
+ FREE(old_exts, M_TEMP);
+ }
return 0;
}
-__private_extern__ int
-is_package_name(char *name, int len)
+int is_package_name(const char *name, int len)
{
int i, extlen;
- char *ptr, *name_ext;
+ const char *ptr, *name_ext;
if (len <= 3) {
return 0;
// advance over the "."
name_ext++;
+ lck_mtx_lock(pkg_extensions_lck);
+
// now iterate over all the extensions to see if any match
ptr = &extension_table[0];
for(i=0; i < nexts; i++, ptr+=max_ext_width) {
extlen = strlen(ptr);
if (strncasecmp(name_ext, ptr, extlen) == 0 && name_ext[extlen] == '\0') {
// aha, a match!
+ lck_mtx_unlock(pkg_extensions_lck);
return 1;
}
}
+ lck_mtx_unlock(pkg_extensions_lck);
+
// if we get here, no extension matched
return 0;
}
return 0;
}
+/*
+ * Determine if a name is inappropriate for a searchfs query.
+ * This list consists of /System currently.
+ */
+
+int vn_searchfs_inappropriate_name(const char *name, int len) {
+ const char *bad_names[] = { "System" };
+ int bad_len[] = { 6 };
+ int i;
+
+ for(i=0; i < (int) (sizeof(bad_names) / sizeof(bad_names[0])); i++) {
+ if (len == bad_len[i] && strncmp(name, bad_names[i], strlen(bad_names[i]) + 1) == 0) {
+ return 1;
+ }
+ }
+
+ // if we get here, no name matched
+ return 0;
+}
/*
* Top level filesystem related information gathering.
*/
extern unsigned int vfs_nummntops;
+/*
+ * The VFS_NUMMNTOPS shouldn't be at name[1] since
+ * is a VFS generic variable. Since we no longer support
+ * VT_UFS, we reserve its value to support this sysctl node.
+ *
+ * It should have been:
+ * name[0]: VFS_GENERIC
+ * name[1]: VFS_NUMMNTOPS
+ */
+SYSCTL_INT(_vfs, VFS_NUMMNTOPS, nummntops,
+ CTLFLAG_RD | CTLFLAG_KERN | CTLFLAG_LOCKED,
+ &vfs_nummntops, 0, "");
+
+int
+vfs_sysctl(int *name __unused, u_int namelen __unused,
+ user_addr_t oldp __unused, size_t *oldlenp __unused,
+ user_addr_t newp __unused, size_t newlen __unused, proc_t p __unused);
+
int
-vfs_sysctl(int *name, u_int namelen, user_addr_t oldp, size_t *oldlenp,
- user_addr_t newp, size_t newlen, struct proc *p)
+vfs_sysctl(int *name __unused, u_int namelen __unused,
+ user_addr_t oldp __unused, size_t *oldlenp __unused,
+ user_addr_t newp __unused, size_t newlen __unused, proc_t p __unused)
{
- struct vfstable *vfsp;
- int *username;
- u_int usernamelen;
- int error;
- struct vfsconf *vfsc;
+ return (EINVAL);
+}
- /*
- * The VFS_NUMMNTOPS shouldn't be at name[0] since
- * is a VFS generic variable. So now we must check
- * namelen so we don't end up covering any UFS
- * variables (sinc UFS vfc_typenum is 1).
- *
- * It should have been:
- * name[0]: VFS_GENERIC
- * name[1]: VFS_NUMMNTOPS
- */
- if (namelen == 1 && name[0] == VFS_NUMMNTOPS) {
- return (sysctl_rdint(oldp, oldlenp, newp, vfs_nummntops));
- }
- /* all sysctl names at this level are at least name and field */
- if (namelen < 2)
- return (EISDIR); /* overloaded */
- if (name[0] != VFS_GENERIC) {
- struct vfs_context context;
+//
+// The following code disallows specific sysctl's that came through
+// the direct sysctl interface (vfs_sysctl_node) instead of the newer
+// sysctl_vfs_ctlbyfsid() interface. We can not allow these selectors
+// through vfs_sysctl_node() because it passes the user's oldp pointer
+// directly to the file system which (for these selectors) casts it
+// back to a struct sysctl_req and then proceed to use SYSCTL_IN()
+// which jumps through an arbitrary function pointer. When called
+// through the sysctl_vfs_ctlbyfsid() interface this does not happen
+// and so it's safe.
+//
+// Unfortunately we have to pull in definitions from AFP and SMB and
+// perform explicit name checks on the file system to determine if
+// these selectors are being used.
+//
- for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
- if (vfsp->vfc_typenum == name[0])
- break;
- if (vfsp == NULL)
- return (ENOTSUP);
- context.vc_proc = p;
- context.vc_ucred = kauth_cred_get();
-
- return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1,
- oldp, oldlenp, newp, newlen, &context));
- }
- switch (name[1]) {
- case VFS_MAXTYPENUM:
- return (sysctl_rdint(oldp, oldlenp, newp, maxvfsconf));
- case VFS_CONF:
- if (namelen < 3)
- return (ENOTDIR); /* overloaded */
- for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
- if (vfsp->vfc_typenum == name[2])
- break;
- if (vfsp == NULL)
- return (ENOTSUP);
- vfsc = (struct vfsconf *)vfsp;
- if (proc_is64bit(p)) {
- struct user_vfsconf usr_vfsc;
- usr_vfsc.vfc_vfsops = CAST_USER_ADDR_T(vfsc->vfc_vfsops);
- bcopy(vfsc->vfc_name, usr_vfsc.vfc_name, sizeof(usr_vfsc.vfc_name));
- usr_vfsc.vfc_typenum = vfsc->vfc_typenum;
- usr_vfsc.vfc_refcount = vfsc->vfc_refcount;
- usr_vfsc.vfc_flags = vfsc->vfc_flags;
- usr_vfsc.vfc_mountroot = CAST_USER_ADDR_T(vfsc->vfc_mountroot);
- usr_vfsc.vfc_next = CAST_USER_ADDR_T(vfsc->vfc_next);
- return (sysctl_rdstruct(oldp, oldlenp, newp, &usr_vfsc,
- sizeof(usr_vfsc)));
+#define AFPFS_VFS_CTL_GETID 0x00020001
+#define AFPFS_VFS_CTL_NETCHANGE 0x00020002
+#define AFPFS_VFS_CTL_VOLCHANGE 0x00020003
+
+#define SMBFS_SYSCTL_REMOUNT 1
+#define SMBFS_SYSCTL_REMOUNT_INFO 2
+#define SMBFS_SYSCTL_GET_SERVER_SHARE 3
+
+
+static int
+is_bad_sysctl_name(struct vfstable *vfsp, int selector_name)
+{
+ switch(selector_name) {
+ case VFS_CTL_QUERY:
+ case VFS_CTL_TIMEO:
+ case VFS_CTL_NOLOCKS:
+ case VFS_CTL_NSTATUS:
+ case VFS_CTL_SADDR:
+ case VFS_CTL_DISC:
+ case VFS_CTL_SERVERINFO:
+ return 1;
+
+ default:
+ break;
+ }
+
+ // the more complicated check for some of SMB's special values
+ if (strcmp(vfsp->vfc_name, "smbfs") == 0) {
+ switch(selector_name) {
+ case SMBFS_SYSCTL_REMOUNT:
+ case SMBFS_SYSCTL_REMOUNT_INFO:
+ case SMBFS_SYSCTL_GET_SERVER_SHARE:
+ return 1;
}
- else {
- return (sysctl_rdstruct(oldp, oldlenp, newp, vfsc,
- sizeof(struct vfsconf)));
+ } else if (strcmp(vfsp->vfc_name, "afpfs") == 0) {
+ switch(selector_name) {
+ case AFPFS_VFS_CTL_GETID:
+ case AFPFS_VFS_CTL_NETCHANGE:
+ case AFPFS_VFS_CTL_VOLCHANGE:
+ return 1;
}
-
- case VFS_SET_PACKAGE_EXTS:
- return set_package_extensions_table((void *)name[1], name[2], name[3]);
}
- /*
- * We need to get back into the general MIB, so we need to re-prepend
- * CTL_VFS to our name and try userland_sysctl().
- */
- usernamelen = namelen + 1;
- MALLOC(username, int *, usernamelen * sizeof(*username),
- M_TEMP, M_WAITOK);
- bcopy(name, username + 1, namelen * sizeof(*name));
- username[0] = CTL_VFS;
- error = userland_sysctl(p, username, usernamelen, oldp,
- oldlenp, 1, newp, newlen, oldlenp);
- FREE(username, M_TEMP);
- return (error);
+
+ //
+ // If we get here we passed all the checks so the selector is ok
+ //
+ return 0;
}
-int kinfo_vdebug = 1;
-#define KINFO_VNODESLOP 10
-/*
- * Dump vnode list (via sysctl).
- * Copyout address of vnode followed by vnode.
- */
-/* ARGSUSED */
-int
-sysctl_vnode(__unused user_addr_t where, __unused size_t *sizep)
+
+int vfs_sysctl_node SYSCTL_HANDLER_ARGS
{
-#if 0
- struct mount *mp, *nmp;
- struct vnode *nvp, *vp;
- char *bp = where, *savebp;
- char *ewhere;
+ int *name, namelen;
+ struct vfstable *vfsp;
int error;
+ int fstypenum;
+
+ fstypenum = oidp->oid_number;
+ name = arg1;
+ namelen = arg2;
-#define VPTRSZ sizeof (struct vnode *)
-#define VNODESZ sizeof (struct vnode)
- if (where == NULL) {
- *sizep = (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ);
- return (0);
- }
- ewhere = where + *sizep;
-
- for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) {
- if (vfs_busy(mp, LK_NOWAIT)) {
- nmp = mp->mnt_list.cqe_next;
- continue;
- }
- savebp = bp;
-again:
- TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) {
- /*
- * Check that the vp is still associated with
- * this filesystem. RACE: could have been
- * recycled onto the same filesystem.
- */
- if (vp->v_mount != mp) {
- if (kinfo_vdebug)
- printf("kinfo: vp changed\n");
- bp = savebp;
- goto again;
- }
- if (bp + VPTRSZ + VNODESZ > ewhere) {
- vfs_unbusy(mp);
- *sizep = bp - where;
- return (ENOMEM);
- }
- if ((error = copyout((caddr_t)&vp, bp, VPTRSZ)) ||
- (error = copyout((caddr_t)vp, bp + VPTRSZ, VNODESZ))) {
- vfs_unbusy(mp);
- return (error);
- }
- bp += VPTRSZ + VNODESZ;
+ /* all sysctl names at this level should have at least one name slot for the FS */
+ if (namelen < 1)
+ return (EISDIR); /* overloaded */
+
+ mount_list_lock();
+ for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
+ if (vfsp->vfc_typenum == fstypenum) {
+ vfsp->vfc_refcount++;
+ break;
}
- nmp = mp->mnt_list.cqe_next;
- vfs_unbusy(mp);
+ mount_list_unlock();
+
+ if (vfsp == NULL) {
+ return (ENOTSUP);
}
- *sizep = bp - where;
- return (0);
-#else
- return(EINVAL);
-#endif
+ if (is_bad_sysctl_name(vfsp, name[0])) {
+ printf("vfs: bad selector 0x%.8x for old-style sysctl(). use the sysctl-by-fsid interface instead\n", name[0]);
+ return EPERM;
+ }
+
+ error = (vfsp->vfc_vfsops->vfs_sysctl)(name, namelen, req->oldptr, &req->oldlen, req->newptr, req->newlen, vfs_context_current());
+
+ mount_list_lock();
+ vfsp->vfc_refcount--;
+ mount_list_unlock();
+
+ return error;
}
/*
* Check to see if a filesystem is mounted on a block device.
*/
int
-vfs_mountedon(vp)
- struct vnode *vp;
+vfs_mountedon(struct vnode *vp)
{
struct vnode *vq;
int error = 0;
error = EBUSY;
goto out;
}
- if (vp->v_flag & VALIASED) {
+ if (vp->v_specflags & SI_ALIASED) {
for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
if (vq->v_rdev != vp->v_rdev ||
vq->v_type != vp->v_type)
return (error);
}
+struct unmount_info {
+ int u_errs; // Total failed unmounts
+ int u_busy; // EBUSY failed unmounts
+};
+
+static int
+unmount_callback(mount_t mp, void *arg)
+{
+ int error;
+ char *mntname;
+ struct unmount_info *uip = arg;
+
+ mount_ref(mp, 0);
+ mount_iterdrop(mp); // avoid vfs_iterate deadlock in dounmount()
+
+ MALLOC_ZONE(mntname, void *, MAXPATHLEN, M_NAMEI, M_WAITOK);
+ if (mntname)
+ strlcpy(mntname, mp->mnt_vfsstat.f_mntonname, MAXPATHLEN);
+
+ error = dounmount(mp, MNT_FORCE, 1, vfs_context_current());
+ if (error) {
+ uip->u_errs++;
+ printf("Unmount of %s failed (%d)\n", mntname ? mntname:"?", error);
+ if (error == EBUSY)
+ uip->u_busy++;
+ }
+ if (mntname)
+ FREE_ZONE(mntname, MAXPATHLEN, M_NAMEI);
+
+ return (VFS_RETURNED);
+}
+
/*
* Unmount all filesystems. The list is traversed in reverse order
* of mounting to avoid dependencies.
+ * Busy mounts are retried.
*/
__private_extern__ void
-vfs_unmountall()
+vfs_unmountall(void)
{
- struct mount *mp;
- struct proc *p = current_proc();
- int error;
- int skip_listremove;
+ int mounts, sec = 1;
+ struct unmount_info ui;
- /*
- * Since this only runs when rebooting, it is not interlocked.
- */
- mount_list_lock();
- while(!TAILQ_EMPTY(&mountlist)) {
- mp = TAILQ_LAST(&mountlist, mntlist);
- mount_list_unlock();
- skip_listremove = 0;
- error = dounmount(mp, MNT_FORCE, &skip_listremove, 0, p);
- if ((error != 0) && (error != EBUSY)) {
- printf("unmount of %s failed (", mp->mnt_vfsstat.f_mntonname);
- printf("%d)\n", error);
-
- mount_list_lock();
- if (skip_listremove == 0) {
- TAILQ_REMOVE(&mountlist, mp, mnt_list);
- }
- continue;
- } else if (error == EBUSY) {
- /* If EBUSY is returned, the unmount was already in progress */
- printf("unmount of %x failed (", (unsigned int)mp);
- printf("BUSY)\n");
- }
- mount_list_lock();
+retry:
+ ui.u_errs = ui.u_busy = 0;
+ vfs_iterate(VFS_ITERATE_CB_DROPREF | VFS_ITERATE_TAIL_FIRST, unmount_callback, &ui);
+ mounts = mount_getvfscnt();
+ if (mounts == 0)
+ return;
+
+ if (ui.u_busy > 0) { // Busy mounts - wait & retry
+ tsleep(&nummounts, PVFS, "busy mount", sec * hz);
+ sec *= 2;
+ if (sec <= 32)
+ goto retry;
+ printf("Unmounting timed out\n");
+ } else if (ui.u_errs < mounts) {
+ // If the vfs_iterate missed mounts in progress - wait a bit
+ tsleep(&nummounts, PVFS, "missed mount", 2 * hz);
}
- mount_list_unlock();
}
-
/*
- * This routine is called from vnode_pager_no_senders()
- * which in turn can be called with vnode locked by vnode_uncache()
- * But it could also get called as a result of vm_object_cache_trim().
- * In that case lock state is unknown.
- * AGE the vnode so that it gets recycled quickly.
+ * This routine is called from vnode_pager_deallocate out of the VM
+ * The path to vnode_pager_deallocate can only be initiated by ubc_destroy_named
+ * on a vnode that has a UBCINFO
*/
__private_extern__ void
-vnode_pager_vrele(struct vnode *vp)
+vnode_pager_vrele(vnode_t vp)
{
- vnode_lock(vp);
+ struct ubc_info *uip;
- if (!ISSET(vp->v_lflag, VL_TERMINATE))
- panic("vnode_pager_vrele: vp not in termination");
- vp->v_lflag &= ~VNAMED_UBC;
+ vnode_lock_spin(vp);
- if (UBCINFOEXISTS(vp)) {
- struct ubc_info *uip = vp->v_ubcinfo;
+ vp->v_lflag &= ~VNAMED_UBC;
+ if (vp->v_usecount != 0) {
+ /*
+ * At the eleventh hour, just before the ubcinfo is
+ * destroyed, ensure the ubc-specific v_usecount
+ * reference has gone. We use v_usecount != 0 as a hint;
+ * ubc_unmap() does nothing if there's no mapping.
+ *
+ * This case is caused by coming here via forced unmount,
+ * versus the usual vm_object_deallocate() path.
+ * In the forced unmount case, ubc_destroy_named()
+ * releases the pager before memory_object_last_unmap()
+ * can be called.
+ */
+ vnode_unlock(vp);
+ ubc_unmap(vp);
+ vnode_lock_spin(vp);
+ }
- if (ISSET(uip->ui_flags, UI_WASMAPPED))
- SET(vp->v_flag, VWASMAPPED);
- vp->v_ubcinfo = UBC_INFO_NULL;
+ uip = vp->v_ubcinfo;
+ vp->v_ubcinfo = UBC_INFO_NULL;
- ubc_info_deallocate(uip);
- } else {
- panic("NO ubcinfo in vnode_pager_vrele");
- }
vnode_unlock(vp);
- wakeup(&vp->v_lflag);
+ ubc_info_deallocate(uip);
}
#include <sys/disk.h>
+u_int32_t rootunit = (u_int32_t)-1;
+
+#if CONFIG_IOSCHED
+extern int lowpri_throttle_enabled;
+extern int iosched_enabled;
+#endif
+
errno_t
vfs_init_io_attributes(vnode_t devvp, mount_t mp)
{
int error;
- off_t readblockcnt;
- off_t writeblockcnt;
- off_t readmaxcnt;
- off_t writemaxcnt;
- off_t readsegcnt;
- off_t writesegcnt;
- off_t readsegsize;
- off_t writesegsize;
- u_long blksize;
+ off_t readblockcnt = 0;
+ off_t writeblockcnt = 0;
+ off_t readmaxcnt = 0;
+ off_t writemaxcnt = 0;
+ off_t readsegcnt = 0;
+ off_t writesegcnt = 0;
+ off_t readsegsize = 0;
+ off_t writesegsize = 0;
+ off_t alignment = 0;
+ u_int32_t minsaturationbytecount = 0;
+ u_int32_t ioqueue_depth = 0;
+ u_int32_t blksize;
u_int64_t temp;
- struct vfs_context context;
-
- proc_t p = current_proc();
+ u_int32_t features;
+ vfs_context_t ctx = vfs_context_current();
+ dk_corestorage_info_t cs_info;
+ boolean_t cs_present = FALSE;;
+ int isssd = 0;
+ int isvirtual = 0;
- context.vc_proc = p;
- context.vc_ucred = kauth_cred_get();
- int isvirtual = 0;
+ VNOP_IOCTL(devvp, DKIOCGETTHROTTLEMASK, (caddr_t)&mp->mnt_throttle_mask, 0, NULL);
/*
- * determine if this mount point exists on the same device as the root
- * partition... if so, then it comes under the hard throttle control
+ * as a reasonable approximation, only use the lowest bit of the mask
+ * to generate a disk unit number
*/
- int thisunit = -1;
- static int rootunit = -1;
+ mp->mnt_devbsdunit = num_trailing_0(mp->mnt_throttle_mask);
- if (rootunit == -1) {
- if (VNOP_IOCTL(rootvp, DKIOCGETBSDUNIT, (caddr_t)&rootunit, 0, &context))
- rootunit = -1;
- else if (rootvp == devvp)
- mp->mnt_kern_flag |= MNTK_ROOTDEV;
- }
- if (devvp != rootvp && rootunit != -1) {
- if (VNOP_IOCTL(devvp, DKIOCGETBSDUNIT, (caddr_t)&thisunit, 0, &context) == 0) {
- if (thisunit == rootunit)
- mp->mnt_kern_flag |= MNTK_ROOTDEV;
- }
+ if (devvp == rootvp)
+ rootunit = mp->mnt_devbsdunit;
+
+ if (mp->mnt_devbsdunit == rootunit) {
+ /*
+ * this mount point exists on the same device as the root
+ * partition, so it comes under the hard throttle control...
+ * this is true even for the root mount point itself
+ */
+ mp->mnt_kern_flag |= MNTK_ROOTDEV;
}
/*
* force the spec device to re-cache
if ((error = VNOP_IOCTL(devvp, DKIOCGETBLOCKSIZE,
- (caddr_t)&blksize, 0, &context)))
+ (caddr_t)&blksize, 0, ctx)))
return (error);
mp->mnt_devblocksize = blksize;
- if (VNOP_IOCTL(devvp, DKIOCISVIRTUAL, (caddr_t)&isvirtual, 0, &context) == 0) {
+ /*
+ * set the maximum possible I/O size
+ * this may get clipped to a smaller value
+ * based on which constraints are being advertised
+ * and if those advertised constraints result in a smaller
+ * limit for a given I/O
+ */
+ mp->mnt_maxreadcnt = MAX_UPL_SIZE_BYTES;
+ mp->mnt_maxwritecnt = MAX_UPL_SIZE_BYTES;
+
+ if (VNOP_IOCTL(devvp, DKIOCISVIRTUAL, (caddr_t)&isvirtual, 0, ctx) == 0) {
if (isvirtual)
mp->mnt_kern_flag |= MNTK_VIRTUALDEV;
}
+ if (VNOP_IOCTL(devvp, DKIOCISSOLIDSTATE, (caddr_t)&isssd, 0, ctx) == 0) {
+ if (isssd)
+ mp->mnt_kern_flag |= MNTK_SSD;
+ }
+ if ((error = VNOP_IOCTL(devvp, DKIOCGETFEATURES,
+ (caddr_t)&features, 0, ctx)))
+ return (error);
if ((error = VNOP_IOCTL(devvp, DKIOCGETMAXBLOCKCOUNTREAD,
- (caddr_t)&readblockcnt, 0, &context)))
+ (caddr_t)&readblockcnt, 0, ctx)))
return (error);
if ((error = VNOP_IOCTL(devvp, DKIOCGETMAXBLOCKCOUNTWRITE,
- (caddr_t)&writeblockcnt, 0, &context)))
+ (caddr_t)&writeblockcnt, 0, ctx)))
return (error);
if ((error = VNOP_IOCTL(devvp, DKIOCGETMAXBYTECOUNTREAD,
- (caddr_t)&readmaxcnt, 0, &context)))
+ (caddr_t)&readmaxcnt, 0, ctx)))
return (error);
if ((error = VNOP_IOCTL(devvp, DKIOCGETMAXBYTECOUNTWRITE,
- (caddr_t)&writemaxcnt, 0, &context)))
+ (caddr_t)&writemaxcnt, 0, ctx)))
return (error);
if ((error = VNOP_IOCTL(devvp, DKIOCGETMAXSEGMENTCOUNTREAD,
- (caddr_t)&readsegcnt, 0, &context)))
+ (caddr_t)&readsegcnt, 0, ctx)))
return (error);
if ((error = VNOP_IOCTL(devvp, DKIOCGETMAXSEGMENTCOUNTWRITE,
- (caddr_t)&writesegcnt, 0, &context)))
+ (caddr_t)&writesegcnt, 0, ctx)))
return (error);
if ((error = VNOP_IOCTL(devvp, DKIOCGETMAXSEGMENTBYTECOUNTREAD,
- (caddr_t)&readsegsize, 0, &context)))
+ (caddr_t)&readsegsize, 0, ctx)))
return (error);
if ((error = VNOP_IOCTL(devvp, DKIOCGETMAXSEGMENTBYTECOUNTWRITE,
- (caddr_t)&writesegsize, 0, &context)))
+ (caddr_t)&writesegsize, 0, ctx)))
+ return (error);
+
+ if ((error = VNOP_IOCTL(devvp, DKIOCGETMINSEGMENTALIGNMENTBYTECOUNT,
+ (caddr_t)&alignment, 0, ctx)))
+ return (error);
+
+ if ((error = VNOP_IOCTL(devvp, DKIOCGETCOMMANDPOOLSIZE,
+ (caddr_t)&ioqueue_depth, 0, ctx)))
return (error);
if (readmaxcnt)
- temp = (readmaxcnt > UINT32_MAX) ? UINT32_MAX : readmaxcnt;
- else {
- if (readblockcnt) {
- temp = readblockcnt * blksize;
- temp = (temp > UINT32_MAX) ? UINT32_MAX : temp;
- } else
- temp = MAXPHYS;
+ mp->mnt_maxreadcnt = (readmaxcnt > UINT32_MAX) ? UINT32_MAX : readmaxcnt;
+
+ if (readblockcnt) {
+ temp = readblockcnt * blksize;
+ temp = (temp > UINT32_MAX) ? UINT32_MAX : temp;
+
+ if (temp < mp->mnt_maxreadcnt)
+ mp->mnt_maxreadcnt = (u_int32_t)temp;
}
- mp->mnt_maxreadcnt = (u_int32_t)temp;
if (writemaxcnt)
- temp = (writemaxcnt > UINT32_MAX) ? UINT32_MAX : writemaxcnt;
- else {
- if (writeblockcnt) {
- temp = writeblockcnt * blksize;
- temp = (temp > UINT32_MAX) ? UINT32_MAX : temp;
- } else
- temp = MAXPHYS;
+ mp->mnt_maxwritecnt = (writemaxcnt > UINT32_MAX) ? UINT32_MAX : writemaxcnt;
+
+ if (writeblockcnt) {
+ temp = writeblockcnt * blksize;
+ temp = (temp > UINT32_MAX) ? UINT32_MAX : temp;
+
+ if (temp < mp->mnt_maxwritecnt)
+ mp->mnt_maxwritecnt = (u_int32_t)temp;
}
- mp->mnt_maxwritecnt = (u_int32_t)temp;
if (readsegcnt) {
temp = (readsegcnt > UINT16_MAX) ? UINT16_MAX : readsegcnt;
- mp->mnt_segreadcnt = (u_int16_t)temp;
+ } else {
+ temp = mp->mnt_maxreadcnt / PAGE_SIZE;
+
+ if (temp > UINT16_MAX)
+ temp = UINT16_MAX;
}
+ mp->mnt_segreadcnt = (u_int16_t)temp;
+
if (writesegcnt) {
temp = (writesegcnt > UINT16_MAX) ? UINT16_MAX : writesegcnt;
- mp->mnt_segwritecnt = (u_int16_t)temp;
+ } else {
+ temp = mp->mnt_maxwritecnt / PAGE_SIZE;
+
+ if (temp > UINT16_MAX)
+ temp = UINT16_MAX;
}
+ mp->mnt_segwritecnt = (u_int16_t)temp;
+
if (readsegsize)
temp = (readsegsize > UINT32_MAX) ? UINT32_MAX : readsegsize;
else
temp = mp->mnt_maxwritecnt;
mp->mnt_maxsegwritesize = (u_int32_t)temp;
+ if (alignment)
+ temp = (alignment > PAGE_SIZE) ? PAGE_MASK : alignment - 1;
+ else
+ temp = 0;
+ mp->mnt_alignmentmask = temp;
+
+
+ if (ioqueue_depth > MNT_DEFAULT_IOQUEUE_DEPTH)
+ temp = ioqueue_depth;
+ else
+ temp = MNT_DEFAULT_IOQUEUE_DEPTH;
+
+ mp->mnt_ioqueue_depth = temp;
+ mp->mnt_ioscale = (mp->mnt_ioqueue_depth + (MNT_DEFAULT_IOQUEUE_DEPTH - 1)) / MNT_DEFAULT_IOQUEUE_DEPTH;
+
+ if (mp->mnt_ioscale > 1)
+ printf("ioqueue_depth = %d, ioscale = %d\n", (int)mp->mnt_ioqueue_depth, (int)mp->mnt_ioscale);
+
+ if (features & DK_FEATURE_FORCE_UNIT_ACCESS)
+ mp->mnt_ioflags |= MNT_IOFLAGS_FUA_SUPPORTED;
+
+ if (VNOP_IOCTL(devvp, DKIOCGETIOMINSATURATIONBYTECOUNT, (caddr_t)&minsaturationbytecount, 0, ctx) == 0) {
+ mp->mnt_minsaturationbytecount = minsaturationbytecount;
+ } else {
+ mp->mnt_minsaturationbytecount = 0;
+ }
+
+ if (VNOP_IOCTL(devvp, DKIOCCORESTORAGE, (caddr_t)&cs_info, 0, ctx) == 0)
+ cs_present = TRUE;
+
+ if (features & DK_FEATURE_UNMAP) {
+ mp->mnt_ioflags |= MNT_IOFLAGS_UNMAP_SUPPORTED;
+
+ if (cs_present == TRUE)
+ mp->mnt_ioflags |= MNT_IOFLAGS_CSUNMAP_SUPPORTED;
+ }
+ if (cs_present == TRUE) {
+ /*
+ * for now we'll use the following test as a proxy for
+ * the underlying drive being FUSION in nature
+ */
+ if ((cs_info.flags & DK_CORESTORAGE_PIN_YOUR_METADATA))
+ mp->mnt_ioflags |= MNT_IOFLAGS_FUSION_DRIVE;
+ } else {
+ /* Check for APFS Fusion */
+ dk_apfs_flavour_t flavour;
+ if ((VNOP_IOCTL(devvp, DKIOCGETAPFSFLAVOUR, (caddr_t)&flavour, 0, ctx) == 0) &&
+ (flavour == DK_APFS_FUSION)) {
+ mp->mnt_ioflags |= MNT_IOFLAGS_FUSION_DRIVE;
+ }
+ }
+
+#if CONFIG_IOSCHED
+ if (iosched_enabled && (features & DK_FEATURE_PRIORITY)) {
+ mp->mnt_ioflags |= MNT_IOFLAGS_IOSCHED_SUPPORTED;
+ throttle_info_disable_throttle(mp->mnt_devbsdunit, (mp->mnt_ioflags & MNT_IOFLAGS_FUSION_DRIVE) != 0);
+ }
+#endif /* CONFIG_IOSCHED */
return (error);
}
static struct klist fs_klist;
+lck_grp_t *fs_klist_lck_grp;
+lck_mtx_t *fs_klist_lock;
void
vfs_event_init(void)
{
klist_init(&fs_klist);
+ fs_klist_lck_grp = lck_grp_alloc_init("fs_klist", NULL);
+ fs_klist_lock = lck_mtx_alloc_init(fs_klist_lck_grp, NULL);
}
void
-vfs_event_signal(__unused fsid_t *fsid, u_int32_t event, __unused intptr_t data)
+vfs_event_signal(fsid_t *fsid, u_int32_t event, intptr_t data)
{
+ if (event == VQ_DEAD || event == VQ_NOTRESP) {
+ struct mount *mp = vfs_getvfs(fsid);
+ if (mp) {
+ mount_lock_spin(mp);
+ if (data)
+ mp->mnt_kern_flag &= ~MNT_LNOTRESP; // Now responding
+ else
+ mp->mnt_kern_flag |= MNT_LNOTRESP; // Not responding
+ mount_unlock(mp);
+ }
+ }
+ lck_mtx_lock(fs_klist_lock);
KNOTE(&fs_klist, event);
+ lck_mtx_unlock(fs_klist_lock);
}
/*
}
static int
-sysctl_vfs_vfslist SYSCTL_HANDLER_ARGS
+sysctl_vfs_vfslist(__unused struct sysctl_oid *oidp, __unused void *arg1,
+ __unused int arg2, struct sysctl_req *req)
{
int actual, error;
size_t space;
return (ENOMEM);
MALLOC(fsidlst, fsid_t *, req->oldlen, M_TEMP, M_WAITOK);
+ if (fsidlst == NULL) {
+ return (ENOMEM);
+ }
+
error = sysctl_vfs_getvfslist(fsidlst, req->oldlen / sizeof(fsid_t),
&actual);
/*
* Do a sysctl by fsid.
*/
static int
-sysctl_vfs_ctlbyfsid SYSCTL_HANDLER_ARGS
+sysctl_vfs_ctlbyfsid(__unused struct sysctl_oid *oidp, void *arg1, int arg2,
+ struct sysctl_req *req)
{
- struct vfsidctl vc;
- struct user_vfsidctl user_vc;
+ union union_vfsidctl vc;
struct mount *mp;
struct vfsstatfs *sp;
- struct proc *p;
- int *name;
- int error, flags, namelen;
- struct vfs_context context;
+ int *name, flags, namelen;
+ int error=0, gotref=0;
+ vfs_context_t ctx = vfs_context_current();
+ proc_t p = req->p; /* XXX req->p != current_proc()? */
boolean_t is_64_bit;
name = arg1;
namelen = arg2;
- p = req->p;
- context.vc_proc = p;
- context.vc_ucred = kauth_cred_get();
is_64_bit = proc_is64bit(p);
- if (is_64_bit) {
- error = SYSCTL_IN(req, &user_vc, sizeof(user_vc));
- if (error)
- return (error);
- if (user_vc.vc_vers != VFS_CTL_VERS1)
- return (EINVAL);
- mp = mount_list_lookupby_fsid(&user_vc.vc_fsid, 0, 0);
- }
- else {
- error = SYSCTL_IN(req, &vc, sizeof(vc));
- if (error)
- return (error);
- if (vc.vc_vers != VFS_CTL_VERS1)
- return (EINVAL);
- mp = mount_list_lookupby_fsid(&vc.vc_fsid, 0, 0);
+ error = SYSCTL_IN(req, &vc, is_64_bit? sizeof(vc.vc64):sizeof(vc.vc32));
+ if (error)
+ goto out;
+ if (vc.vc32.vc_vers != VFS_CTL_VERS1) { /* works for 32 and 64 */
+ error = EINVAL;
+ goto out;
}
- if (mp == NULL)
- return (ENOENT);
+ mp = mount_list_lookupby_fsid(&vc.vc32.vc_fsid, 0, 1); /* works for 32 and 64 */
+ if (mp == NULL) {
+ error = ENOENT;
+ goto out;
+ }
+ gotref = 1;
/* reset so that the fs specific code can fetch it. */
req->newidx = 0;
/*
error = mp->mnt_op->vfs_sysctl(name, namelen,
CAST_USER_ADDR_T(req),
NULL, USER_ADDR_NULL, 0,
- &context);
+ ctx);
}
else {
error = ENOTSUP;
error = mp->mnt_op->vfs_sysctl(name, namelen,
CAST_USER_ADDR_T(req),
NULL, USER_ADDR_NULL, 0,
- &context);
+ ctx);
+ }
+ if (error != ENOTSUP) {
+ goto out;
}
- if (error != ENOTSUP)
- return (error);
}
switch (name[0]) {
case VFS_CTL_UMOUNT:
req->newidx = 0;
if (is_64_bit) {
- req->newptr = user_vc.vc_ptr;
- req->newlen = (size_t)user_vc.vc_len;
+ req->newptr = vc.vc64.vc_ptr;
+ req->newlen = (size_t)vc.vc64.vc_len;
}
else {
- req->newptr = CAST_USER_ADDR_T(vc.vc_ptr);
- req->newlen = vc.vc_len;
+ req->newptr = CAST_USER_ADDR_T(vc.vc32.vc_ptr);
+ req->newlen = vc.vc32.vc_len;
}
error = SYSCTL_IN(req, &flags, sizeof(flags));
if (error)
break;
+
mount_ref(mp, 0);
+ mount_iterdrop(mp);
+ gotref = 0;
/* safedounmount consumes a ref */
- error = safedounmount(mp, flags, p);
+ error = safedounmount(mp, flags, ctx);
break;
case VFS_CTL_STATFS:
req->newidx = 0;
if (is_64_bit) {
- req->newptr = user_vc.vc_ptr;
- req->newlen = (size_t)user_vc.vc_len;
+ req->newptr = vc.vc64.vc_ptr;
+ req->newlen = (size_t)vc.vc64.vc_len;
}
else {
- req->newptr = CAST_USER_ADDR_T(vc.vc_ptr);
- req->newlen = vc.vc_len;
+ req->newptr = CAST_USER_ADDR_T(vc.vc32.vc_ptr);
+ req->newlen = vc.vc32.vc_len;
}
error = SYSCTL_IN(req, &flags, sizeof(flags));
if (error)
break;
sp = &mp->mnt_vfsstat;
- if (((flags & MNT_NOWAIT) == 0 || (flags & MNT_WAIT)) &&
- (error = vfs_update_vfsstat(mp, &context)))
- return (error);
+ if (((flags & MNT_NOWAIT) == 0 || (flags & (MNT_WAIT | MNT_DWAIT))) &&
+ (error = vfs_update_vfsstat(mp, ctx, VFS_USER_EVENT)))
+ goto out;
if (is_64_bit) {
- struct user_statfs sfs;
+ struct user64_statfs sfs;
bzero(&sfs, sizeof(sfs));
sfs.f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
sfs.f_type = mp->mnt_vtable->vfc_typenum;
- sfs.f_bsize = (user_long_t)sp->f_bsize;
- sfs.f_iosize = (user_long_t)sp->f_iosize;
- sfs.f_blocks = (user_long_t)sp->f_blocks;
- sfs.f_bfree = (user_long_t)sp->f_bfree;
- sfs.f_bavail = (user_long_t)sp->f_bavail;
- sfs.f_files = (user_long_t)sp->f_files;
- sfs.f_ffree = (user_long_t)sp->f_ffree;
+ sfs.f_bsize = (user64_long_t)sp->f_bsize;
+ sfs.f_iosize = (user64_long_t)sp->f_iosize;
+ sfs.f_blocks = (user64_long_t)sp->f_blocks;
+ sfs.f_bfree = (user64_long_t)sp->f_bfree;
+ sfs.f_bavail = (user64_long_t)sp->f_bavail;
+ sfs.f_files = (user64_long_t)sp->f_files;
+ sfs.f_ffree = (user64_long_t)sp->f_ffree;
sfs.f_fsid = sp->f_fsid;
sfs.f_owner = sp->f_owner;
-
- strncpy(&sfs.f_fstypename, &sp->f_fstypename, MFSNAMELEN-1);
- strncpy(&sfs.f_mntonname, &sp->f_mntonname, MNAMELEN-1);
- strncpy(&sfs.f_mntfromname, &sp->f_mntfromname, MNAMELEN-1);
+#ifdef NFSCLIENT
+ if (mp->mnt_kern_flag & MNTK_TYPENAME_OVERRIDE) {
+ strlcpy(&sfs.f_fstypename[0], &mp->fstypename_override[0], MFSNAMELEN);
+ } else
+#endif
+ {
+ strlcpy(sfs.f_fstypename, sp->f_fstypename, MFSNAMELEN);
+ }
+ strlcpy(sfs.f_mntonname, sp->f_mntonname, MNAMELEN);
+ strlcpy(sfs.f_mntfromname, sp->f_mntfromname, MNAMELEN);
error = SYSCTL_OUT(req, &sfs, sizeof(sfs));
}
else {
- struct statfs sfs;
- bzero(&sfs, sizeof(struct statfs));
+ struct user32_statfs sfs;
+ bzero(&sfs, sizeof(sfs));
sfs.f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
sfs.f_type = mp->mnt_vtable->vfc_typenum;
* have to fudge the numbers here in that case. We inflate the blocksize in order
* to reflect the filesystem size as best we can.
*/
- if (sp->f_blocks > LONG_MAX) {
+ if (sp->f_blocks > INT_MAX) {
int shift;
/*
* being smaller than f_bsize.
*/
for (shift = 0; shift < 32; shift++) {
- if ((sp->f_blocks >> shift) <= LONG_MAX)
+ if ((sp->f_blocks >> shift) <= INT_MAX)
break;
- if ((sp->f_bsize << (shift + 1)) > LONG_MAX)
+ if ((((long long)sp->f_bsize) << (shift + 1)) > INT_MAX)
break;
}
-#define __SHIFT_OR_CLIP(x, s) ((((x) >> (s)) > LONG_MAX) ? LONG_MAX : ((x) >> (s)))
- sfs.f_blocks = (long)__SHIFT_OR_CLIP(sp->f_blocks, shift);
- sfs.f_bfree = (long)__SHIFT_OR_CLIP(sp->f_bfree, shift);
- sfs.f_bavail = (long)__SHIFT_OR_CLIP(sp->f_bavail, shift);
+#define __SHIFT_OR_CLIP(x, s) ((((x) >> (s)) > INT_MAX) ? INT_MAX : ((x) >> (s)))
+ sfs.f_blocks = (user32_long_t)__SHIFT_OR_CLIP(sp->f_blocks, shift);
+ sfs.f_bfree = (user32_long_t)__SHIFT_OR_CLIP(sp->f_bfree, shift);
+ sfs.f_bavail = (user32_long_t)__SHIFT_OR_CLIP(sp->f_bavail, shift);
#undef __SHIFT_OR_CLIP
- sfs.f_bsize = (long)(sp->f_bsize << shift);
+ sfs.f_bsize = (user32_long_t)(sp->f_bsize << shift);
sfs.f_iosize = lmax(sp->f_iosize, sp->f_bsize);
} else {
- sfs.f_bsize = (long)sp->f_bsize;
- sfs.f_iosize = (long)sp->f_iosize;
- sfs.f_blocks = (long)sp->f_blocks;
- sfs.f_bfree = (long)sp->f_bfree;
- sfs.f_bavail = (long)sp->f_bavail;
+ sfs.f_bsize = (user32_long_t)sp->f_bsize;
+ sfs.f_iosize = (user32_long_t)sp->f_iosize;
+ sfs.f_blocks = (user32_long_t)sp->f_blocks;
+ sfs.f_bfree = (user32_long_t)sp->f_bfree;
+ sfs.f_bavail = (user32_long_t)sp->f_bavail;
}
- sfs.f_files = (long)sp->f_files;
- sfs.f_ffree = (long)sp->f_ffree;
+ sfs.f_files = (user32_long_t)sp->f_files;
+ sfs.f_ffree = (user32_long_t)sp->f_ffree;
sfs.f_fsid = sp->f_fsid;
sfs.f_owner = sp->f_owner;
-
- strncpy(&sfs.f_fstypename, &sp->f_fstypename, MFSNAMELEN-1);
- strncpy(&sfs.f_mntonname, &sp->f_mntonname, MNAMELEN-1);
- strncpy(&sfs.f_mntfromname, &sp->f_mntfromname, MNAMELEN-1);
+
+#ifdef NFSCLIENT
+ if (mp->mnt_kern_flag & MNTK_TYPENAME_OVERRIDE) {
+ strlcpy(&sfs.f_fstypename[0], &mp->fstypename_override[0], MFSNAMELEN);
+ } else
+#endif
+ {
+ strlcpy(sfs.f_fstypename, sp->f_fstypename, MFSNAMELEN);
+ }
+ strlcpy(sfs.f_mntonname, sp->f_mntonname, MNAMELEN);
+ strlcpy(sfs.f_mntfromname, sp->f_mntfromname, MNAMELEN);
error = SYSCTL_OUT(req, &sfs, sizeof(sfs));
}
break;
default:
- return (ENOTSUP);
+ error = ENOTSUP;
+ goto out;
}
+out:
+ if(gotref != 0)
+ mount_iterdrop(mp);
return (error);
}
-static int filt_fsattach(struct knote *kn);
+static int filt_fsattach(struct knote *kn, struct kevent_internal_s *kev);
static void filt_fsdetach(struct knote *kn);
static int filt_fsevent(struct knote *kn, long hint);
-
-struct filterops fs_filtops =
- { 0, filt_fsattach, filt_fsdetach, filt_fsevent };
+static int filt_fstouch(struct knote *kn, struct kevent_internal_s *kev);
+static int filt_fsprocess(struct knote *kn, struct filt_process_s *data, struct kevent_internal_s *kev);
+SECURITY_READ_ONLY_EARLY(struct filterops) fs_filtops = {
+ .f_attach = filt_fsattach,
+ .f_detach = filt_fsdetach,
+ .f_event = filt_fsevent,
+ .f_touch = filt_fstouch,
+ .f_process = filt_fsprocess,
+};
static int
-filt_fsattach(struct knote *kn)
+filt_fsattach(struct knote *kn, __unused struct kevent_internal_s *kev)
{
-
- kn->kn_flags |= EV_CLEAR;
+ lck_mtx_lock(fs_klist_lock);
KNOTE_ATTACH(&fs_klist, kn);
+ lck_mtx_unlock(fs_klist_lock);
+
+ /*
+ * filter only sees future events,
+ * so it can't be fired already.
+ */
return (0);
}
static void
filt_fsdetach(struct knote *kn)
{
-
+ lck_mtx_lock(fs_klist_lock);
KNOTE_DETACH(&fs_klist, kn);
+ lck_mtx_unlock(fs_klist_lock);
}
static int
filt_fsevent(struct knote *kn, long hint)
{
+ /*
+ * Backwards compatibility:
+ * Other filters would do nothing if kn->kn_sfflags == 0
+ */
+
+ if ((kn->kn_sfflags == 0) || (kn->kn_sfflags & hint)) {
+ kn->kn_fflags |= hint;
+ }
- kn->kn_fflags |= hint;
return (kn->kn_fflags != 0);
}
static int
-sysctl_vfs_noremotehang SYSCTL_HANDLER_ARGS
+filt_fstouch(struct knote *kn, struct kevent_internal_s *kev)
+{
+ int res;
+
+ lck_mtx_lock(fs_klist_lock);
+
+ kn->kn_sfflags = kev->fflags;
+ if ((kn->kn_status & KN_UDATA_SPECIFIC) == 0)
+ kn->kn_udata = kev->udata;
+
+ /*
+ * the above filter function sets bits even if nobody is looking for them.
+ * Just preserve those bits even in the new mask is more selective
+ * than before.
+ *
+ * For compatibility with previous implementations, we leave kn_fflags
+ * as they were before.
+ */
+ //if (kn->kn_sfflags)
+ // kn->kn_fflags &= kn->kn_sfflags;
+ res = (kn->kn_fflags != 0);
+
+ lck_mtx_unlock(fs_klist_lock);
+
+ return res;
+}
+
+static int
+filt_fsprocess(struct knote *kn, struct filt_process_s *data, struct kevent_internal_s *kev)
+{
+#pragma unused(data)
+ int res;
+
+ lck_mtx_lock(fs_klist_lock);
+ res = (kn->kn_fflags != 0);
+ if (res) {
+ *kev = kn->kn_kevent;
+ kn->kn_flags |= EV_CLEAR; /* automatic */
+ kn->kn_fflags = 0;
+ kn->kn_data = 0;
+ }
+ lck_mtx_unlock(fs_klist_lock);
+ return res;
+}
+
+static int
+sysctl_vfs_noremotehang(__unused struct sysctl_oid *oidp,
+ __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
int out, error;
pid_t pid;
- size_t space;
- struct proc *p;
+ proc_t p;
/* We need a pid. */
if (req->newptr == USER_ADDR_NULL)
if (error)
return (error);
- p = pfind(pid < 0 ? -pid : pid);
+ p = proc_find(pid < 0 ? -pid : pid);
if (p == NULL)
return (ESRCH);
*/
if (req->oldptr != USER_ADDR_NULL) {
out = !((p->p_flag & P_NOREMOTEHANG) == 0);
+ proc_rele(p);
error = SYSCTL_OUT(req, &out, sizeof(out));
return (error);
}
- /* XXX req->p->p_ucred -> kauth_cred_get() - current unsafe ??? */
/* cansignal offers us enough security. */
- if (p != req->p && suser(req->p->p_ucred, &req->p->p_acflag) != 0)
+ if (p != req->p && proc_suser(req->p) != 0) {
+ proc_rele(p);
return (EPERM);
+ }
if (pid < 0)
- p->p_flag &= ~P_NOREMOTEHANG;
+ OSBitAndAtomic(~((uint32_t)P_NOREMOTEHANG), &p->p_flag);
else
- p->p_flag |= P_NOREMOTEHANG;
+ OSBitOrAtomic(P_NOREMOTEHANG, &p->p_flag);
+ proc_rele(p);
return (0);
}
+
+static int
+sysctl_vfs_generic_conf SYSCTL_HANDLER_ARGS
+{
+ int *name, namelen;
+ struct vfstable *vfsp;
+ struct vfsconf vfsc;
+
+ (void)oidp;
+ name = arg1;
+ namelen = arg2;
+
+ if (namelen < 1) {
+ return (EISDIR);
+ } else if (namelen > 1) {
+ return (ENOTDIR);
+ }
+
+ mount_list_lock();
+ for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
+ if (vfsp->vfc_typenum == name[0])
+ break;
+
+ if (vfsp == NULL) {
+ mount_list_unlock();
+ return (ENOTSUP);
+ }
+
+ vfsc.vfc_reserved1 = 0;
+ bcopy(vfsp->vfc_name, vfsc.vfc_name, sizeof(vfsc.vfc_name));
+ vfsc.vfc_typenum = vfsp->vfc_typenum;
+ vfsc.vfc_refcount = vfsp->vfc_refcount;
+ vfsc.vfc_flags = vfsp->vfc_flags;
+ vfsc.vfc_reserved2 = 0;
+ vfsc.vfc_reserved3 = 0;
+
+ mount_list_unlock();
+ return (SYSCTL_OUT(req, &vfsc, sizeof(struct vfsconf)));
+}
+
/* the vfs.generic. branch. */
-SYSCTL_NODE(_vfs, VFS_GENERIC, generic, CTLFLAG_RW, 0, "vfs generic hinge");
+SYSCTL_NODE(_vfs, VFS_GENERIC, generic, CTLFLAG_RW | CTLFLAG_LOCKED, NULL, "vfs generic hinge");
/* retreive a list of mounted filesystem fsid_t */
-SYSCTL_PROC(_vfs_generic, OID_AUTO, vfsidlist, CTLFLAG_RD,
- 0, 0, sysctl_vfs_vfslist, "S,fsid", "List of mounted filesystem ids");
+SYSCTL_PROC(_vfs_generic, OID_AUTO, vfsidlist,
+ CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED,
+ NULL, 0, sysctl_vfs_vfslist, "S,fsid", "List of mounted filesystem ids");
/* perform operations on filesystem via fsid_t */
-SYSCTL_NODE(_vfs_generic, OID_AUTO, ctlbyfsid, CTLFLAG_RW,
+SYSCTL_NODE(_vfs_generic, OID_AUTO, ctlbyfsid, CTLFLAG_RW | CTLFLAG_LOCKED,
sysctl_vfs_ctlbyfsid, "ctlbyfsid");
-SYSCTL_PROC(_vfs_generic, OID_AUTO, noremotehang, CTLFLAG_RW,
- 0, 0, sysctl_vfs_noremotehang, "I", "noremotehang");
-
-
-int num_reusedvnodes=0;
+SYSCTL_PROC(_vfs_generic, OID_AUTO, noremotehang, CTLFLAG_RW | CTLFLAG_ANYBODY,
+ NULL, 0, sysctl_vfs_noremotehang, "I", "noremotehang");
+SYSCTL_INT(_vfs_generic, VFS_MAXTYPENUM, maxtypenum,
+ CTLFLAG_RD | CTLFLAG_KERN | CTLFLAG_LOCKED,
+ &maxvfstypenum, 0, "");
+SYSCTL_INT(_vfs_generic, OID_AUTO, sync_timeout, CTLFLAG_RW | CTLFLAG_LOCKED, &sync_timeout, 0, "");
+SYSCTL_NODE(_vfs_generic, VFS_CONF, conf,
+ CTLFLAG_RD | CTLFLAG_LOCKED,
+ sysctl_vfs_generic_conf, "");
+
+/* Indicate that the root file system unmounted cleanly */
+static int vfs_root_unmounted_cleanly = 0;
+SYSCTL_INT(_vfs_generic, OID_AUTO, root_unmounted_cleanly, CTLFLAG_RD, &vfs_root_unmounted_cleanly, 0, "Root filesystem was unmounted cleanly");
-static int
-new_vnode(vnode_t *vpp)
+void
+vfs_set_root_unmounted_cleanly(void)
{
- vnode_t vp;
- int retries = 0; /* retry incase of tablefull */
- int vpid;
- struct timespec ts;
+ vfs_root_unmounted_cleanly = 1;
+}
-retry:
- vnode_list_lock();
+/*
+ * Print vnode state.
+ */
+void
+vn_print_state(struct vnode *vp, const char *fmt, ...)
+{
+ va_list ap;
+ char perm_str[] = "(VM_KERNEL_ADDRPERM pointer)";
+ char fs_name[MFSNAMELEN];
+
+ va_start(ap, fmt);
+ vprintf(fmt, ap);
+ va_end(ap);
+ printf("vp 0x%0llx %s: ", (uint64_t)VM_KERNEL_ADDRPERM(vp), perm_str);
+ printf("tag %d, type %d\n", vp->v_tag, vp->v_type);
+ /* Counts .. */
+ printf(" iocount %d, usecount %d, kusecount %d references %d\n",
+ vp->v_iocount, vp->v_usecount, vp->v_kusecount, vp->v_references);
+ printf(" writecount %d, numoutput %d\n", vp->v_writecount,
+ vp->v_numoutput);
+ /* Flags */
+ printf(" flag 0x%x, lflag 0x%x, listflag 0x%x\n", vp->v_flag,
+ vp->v_lflag, vp->v_listflag);
+
+ if (vp->v_mount == NULL || vp->v_mount == dead_mountp) {
+ strlcpy(fs_name, "deadfs", MFSNAMELEN);
+ } else {
+ vfs_name(vp->v_mount, fs_name);
+ }
- if ( !TAILQ_EMPTY(&vnode_free_list)) {
- /*
- * Pick the first vp for possible reuse
- */
- vp = TAILQ_FIRST(&vnode_free_list);
+ printf(" v_data 0x%0llx %s\n",
+ (vp->v_data ? (uint64_t)VM_KERNEL_ADDRPERM(vp->v_data) : 0),
+ perm_str);
+ printf(" v_mount 0x%0llx %s vfs_name %s\n",
+ (vp->v_mount ? (uint64_t)VM_KERNEL_ADDRPERM(vp->v_mount) : 0),
+ perm_str, fs_name);
+}
- if (vp->v_lflag & VL_DEAD)
- goto steal_this_vp;
- } else
- vp = NULL;
+long num_reusedvnodes = 0;
- /*
- * we're either empty, or the next guy on the
- * list is a valid vnode... if we're under the
- * limit, we'll create a new vnode
- */
- if (numvnodes < desiredvnodes) {
- numvnodes++;
- vnode_list_unlock();
- MALLOC_ZONE(vp, struct vnode *, sizeof *vp, M_VNODE, M_WAITOK);
- bzero((char *)vp, sizeof *vp);
- VLISTNONE(vp); /* avoid double queue removal */
- lck_mtx_init(&vp->v_lock, vnode_lck_grp, vnode_lck_attr);
- nanouptime(&ts);
- vp->v_id = ts.tv_nsec;
- vp->v_flag = VSTANDARD;
+static vnode_t
+process_vp(vnode_t vp, int want_vp, int *deferred)
+{
+ unsigned int vpid;
+
+ *deferred = 0;
- goto done;
- }
- if (vp == NULL) {
- /*
- * we've reached the system imposed maximum number of vnodes
- * but there isn't a single one available
- * wait a bit and then retry... if we can't get a vnode
- * after 100 retries, than log a complaint
- */
- if (++retries <= 100) {
- vnode_list_unlock();
- IOSleep(1);
- goto retry;
- }
-
- vnode_list_unlock();
- tablefull("vnode");
- log(LOG_EMERG, "%d desired, %d numvnodes, "
- "%d free, %d inactive\n",
- desiredvnodes, numvnodes, freevnodes, inactivevnodes);
- *vpp = 0;
- return (ENFILE);
- }
-steal_this_vp:
vpid = vp->v_id;
- VREMFREE("new_vnode", vp);
- VLISTNONE(vp);
+ vnode_list_remove_locked(vp);
vnode_list_unlock();
- vnode_lock(vp);
+
+ vnode_lock_spin(vp);
/*
* We could wait for the vnode_lock after removing the vp from the freelist
* that we are looking at a vnode that is being terminated. If so skip it.
*/
if ((vpid != vp->v_id) || (vp->v_usecount != 0) || (vp->v_iocount != 0) ||
- VONLIST(vp) || (vp->v_lflag & VL_TERMINATE)) {
+ VONLIST(vp) || (vp->v_lflag & VL_TERMINATE)) {
/*
* we lost the race between dropping the list lock
* and picking up the vnode_lock... someone else
* used this vnode and it is now in a new state
- * so we need to go back and try again
*/
vnode_unlock(vp);
- goto retry;
+
+ return (NULLVP);
}
if ( (vp->v_lflag & (VL_NEEDINACTIVE | VL_MARKTERM)) == VL_NEEDINACTIVE ) {
/*
#endif
vnode_put_locked(vp);
vnode_unlock(vp);
- goto retry;
- }
- OSAddAtomic(1, &num_reusedvnodes);
- /* Checks for anyone racing us for recycle */
+ return (NULLVP);
+ }
+ /*
+ * Checks for anyone racing us for recycle
+ */
if (vp->v_type != VBAD) {
+ if (want_vp && (vnode_on_reliable_media(vp) == FALSE || (vp->v_flag & VISDIRTY))) {
+ vnode_async_list_add(vp);
+ vnode_unlock(vp);
+
+ *deferred = 1;
+
+ return (NULLVP);
+ }
if (vp->v_lflag & VL_DEAD)
- panic("new_vnode: the vnode is VL_DEAD but not VBAD");
+ panic("new_vnode(%p): the vnode is VL_DEAD but not VBAD", vp);
+
+ vnode_lock_convert(vp);
+ (void)vnode_reclaim_internal(vp, 1, want_vp, 0);
+
+ if (want_vp) {
+ if ((VONLIST(vp)))
+ panic("new_vnode(%p): vp on list", vp);
+ if (vp->v_usecount || vp->v_iocount || vp->v_kusecount ||
+ (vp->v_lflag & (VNAMED_UBC | VNAMED_MOUNT | VNAMED_FSHASH)))
+ panic("new_vnode(%p): free vnode still referenced", vp);
+ if ((vp->v_mntvnodes.tqe_prev != 0) && (vp->v_mntvnodes.tqe_next != 0))
+ panic("new_vnode(%p): vnode seems to be on mount list", vp);
+ if ( !LIST_EMPTY(&vp->v_nclinks) || !TAILQ_EMPTY(&vp->v_ncchildren))
+ panic("new_vnode(%p): vnode still hooked into the name cache", vp);
+ } else {
+ vnode_unlock(vp);
+ vp = NULLVP;
+ }
+ }
+ return (vp);
+}
+
+__attribute__((noreturn))
+static void
+async_work_continue(void)
+{
+ struct async_work_lst *q;
+ int deferred;
+ vnode_t vp;
+
+ q = &vnode_async_work_list;
+
+ for (;;) {
+
+ vnode_list_lock();
+
+ if ( TAILQ_EMPTY(q) ) {
+ assert_wait(q, (THREAD_UNINT));
+
+ vnode_list_unlock();
+
+ thread_block((thread_continue_t)async_work_continue);
+
+ continue;
+ }
+ async_work_handled++;
+
+ vp = TAILQ_FIRST(q);
+
+ vp = process_vp(vp, 0, &deferred);
+
+ if (vp != NULLVP)
+ panic("found VBAD vp (%p) on async queue", vp);
+ }
+}
+
+
+static int
+new_vnode(vnode_t *vpp)
+{
+ vnode_t vp;
+ uint32_t retries = 0, max_retries = 100; /* retry incase of tablefull */
+ int force_alloc = 0, walk_count = 0;
+ boolean_t need_reliable_vp = FALSE;
+ int deferred;
+ struct timeval initial_tv;
+ struct timeval current_tv;
+ proc_t curproc = current_proc();
+
+ initial_tv.tv_sec = 0;
+retry:
+ vp = NULLVP;
+
+ vnode_list_lock();
+
+ if (need_reliable_vp == TRUE)
+ async_work_timed_out++;
+
+ if ((numvnodes - deadvnodes) < desiredvnodes || force_alloc) {
+ struct timespec ts;
+
+ if ( !TAILQ_EMPTY(&vnode_dead_list)) {
+ /*
+ * Can always reuse a dead one
+ */
+ vp = TAILQ_FIRST(&vnode_dead_list);
+ goto steal_this_vp;
+ }
+ /*
+ * no dead vnodes available... if we're under
+ * the limit, we'll create a new vnode
+ */
+ numvnodes++;
+ vnode_list_unlock();
+
+ MALLOC_ZONE(vp, struct vnode *, sizeof(*vp), M_VNODE, M_WAITOK);
+ bzero((char *)vp, sizeof(*vp));
+ VLISTNONE(vp); /* avoid double queue removal */
+ lck_mtx_init(&vp->v_lock, vnode_lck_grp, vnode_lck_attr);
+
+ TAILQ_INIT(&vp->v_ncchildren);
+
+ klist_init(&vp->v_knotes);
+ nanouptime(&ts);
+ vp->v_id = ts.tv_nsec;
+ vp->v_flag = VSTANDARD;
+
+#if CONFIG_MACF
+ if (mac_vnode_label_init_needed(vp))
+ mac_vnode_label_init(vp);
+#endif /* MAC */
+
+ vp->v_iocount = 1;
+ goto done;
+ }
+ microuptime(¤t_tv);
+
+#define MAX_WALK_COUNT 1000
+
+ if ( !TAILQ_EMPTY(&vnode_rage_list) &&
+ (ragevnodes >= rage_limit ||
+ (current_tv.tv_sec - rage_tv.tv_sec) >= RAGE_TIME_LIMIT)) {
+
+ TAILQ_FOREACH(vp, &vnode_rage_list, v_freelist) {
+ if ( !(vp->v_listflag & VLIST_RAGE))
+ panic("new_vnode: vp (%p) on RAGE list not marked VLIST_RAGE", vp);
+
+ // if we're a dependency-capable process, skip vnodes that can
+ // cause recycling deadlocks. (i.e. this process is diskimages
+ // helper and the vnode is in a disk image). Querying the
+ // mnt_kern_flag for the mount's virtual device status
+ // is safer than checking the mnt_dependent_process, which
+ // may not be updated if there are multiple devnode layers
+ // in between the disk image and the final consumer.
+
+ if ((curproc->p_flag & P_DEPENDENCY_CAPABLE) == 0 || vp->v_mount == NULL ||
+ (vp->v_mount->mnt_kern_flag & MNTK_VIRTUALDEV) == 0) {
+ /*
+ * if need_reliable_vp == TRUE, then we've already sent one or more
+ * non-reliable vnodes to the async thread for processing and timed
+ * out waiting for a dead vnode to show up. Use the MAX_WALK_COUNT
+ * mechanism to first scan for a reliable vnode before forcing
+ * a new vnode to be created
+ */
+ if (need_reliable_vp == FALSE || vnode_on_reliable_media(vp) == TRUE)
+ break;
+ }
+
+ // don't iterate more than MAX_WALK_COUNT vnodes to
+ // avoid keeping the vnode list lock held for too long.
+
+ if (walk_count++ > MAX_WALK_COUNT) {
+ vp = NULL;
+ break;
+ }
+ }
+ }
+
+ if (vp == NULL && !TAILQ_EMPTY(&vnode_free_list)) {
+ /*
+ * Pick the first vp for possible reuse
+ */
+ walk_count = 0;
+ TAILQ_FOREACH(vp, &vnode_free_list, v_freelist) {
+
+ // if we're a dependency-capable process, skip vnodes that can
+ // cause recycling deadlocks. (i.e. this process is diskimages
+ // helper and the vnode is in a disk image). Querying the
+ // mnt_kern_flag for the mount's virtual device status
+ // is safer than checking the mnt_dependent_process, which
+ // may not be updated if there are multiple devnode layers
+ // in between the disk image and the final consumer.
+
+ if ((curproc->p_flag & P_DEPENDENCY_CAPABLE) == 0 || vp->v_mount == NULL ||
+ (vp->v_mount->mnt_kern_flag & MNTK_VIRTUALDEV) == 0) {
+ /*
+ * if need_reliable_vp == TRUE, then we've already sent one or more
+ * non-reliable vnodes to the async thread for processing and timed
+ * out waiting for a dead vnode to show up. Use the MAX_WALK_COUNT
+ * mechanism to first scan for a reliable vnode before forcing
+ * a new vnode to be created
+ */
+ if (need_reliable_vp == FALSE || vnode_on_reliable_media(vp) == TRUE)
+ break;
+ }
+
+ // don't iterate more than MAX_WALK_COUNT vnodes to
+ // avoid keeping the vnode list lock held for too long.
+
+ if (walk_count++ > MAX_WALK_COUNT) {
+ vp = NULL;
+ break;
+ }
+ }
+ }
+
+ //
+ // if we don't have a vnode and the walk_count is >= MAX_WALK_COUNT
+ // then we're trying to create a vnode on behalf of a
+ // process like diskimages-helper that has file systems
+ // mounted on top of itself (and thus we can't reclaim
+ // vnodes in the file systems on top of us). if we can't
+ // find a vnode to reclaim then we'll just have to force
+ // the allocation.
+ //
+ if (vp == NULL && walk_count >= MAX_WALK_COUNT) {
+ force_alloc = 1;
+ vnode_list_unlock();
+ goto retry;
+ }
+
+ if (vp == NULL) {
+ /*
+ * we've reached the system imposed maximum number of vnodes
+ * but there isn't a single one available
+ * wait a bit and then retry... if we can't get a vnode
+ * after our target number of retries, than log a complaint
+ */
+ if (++retries <= max_retries) {
+ vnode_list_unlock();
+ delay_for_interval(1, 1000 * 1000);
+ goto retry;
+ }
+
+ vnode_list_unlock();
+ tablefull("vnode");
+ log(LOG_EMERG, "%d desired, %d numvnodes, "
+ "%d free, %d dead, %d async, %d rage\n",
+ desiredvnodes, numvnodes, freevnodes, deadvnodes, async_work_vnodes, ragevnodes);
+#if CONFIG_JETSAM
+
+#if DEVELOPMENT || DEBUG
+ if (bootarg_no_vnode_jetsam)
+ panic("vnode table is full\n");
+#endif /* DEVELOPMENT || DEBUG */
+
+ /*
+ * Running out of vnodes tends to make a system unusable. Start killing
+ * processes that jetsam knows are killable.
+ */
+ if (memorystatus_kill_on_vnode_limit() == FALSE) {
+ /*
+ * If jetsam can't find any more processes to kill and there
+ * still aren't any free vnodes, panic. Hopefully we'll get a
+ * panic log to tell us why we ran out.
+ */
+ panic("vnode table is full\n");
+ }
+
+ /*
+ * Now that we've killed someone, wait a bit and continue looking
+ * (with fewer retries before trying another kill).
+ */
+ delay_for_interval(3, 1000 * 1000);
+ retries = 0;
+ max_retries = 10;
+ goto retry;
+#endif
+
+ *vpp = NULL;
+ return (ENFILE);
+ }
+steal_this_vp:
+ if ((vp = process_vp(vp, 1, &deferred)) == NULLVP) {
+ if (deferred) {
+ int elapsed_msecs;
+ struct timeval elapsed_tv;
+
+ if (initial_tv.tv_sec == 0)
+ microuptime(&initial_tv);
+
+ vnode_list_lock();
+
+ dead_vnode_waited++;
+ dead_vnode_wanted++;
+
+ /*
+ * note that we're only going to explicitly wait 10ms
+ * for a dead vnode to become available, since even if one
+ * isn't available, a reliable vnode might now be available
+ * at the head of the VRAGE or free lists... if so, we
+ * can satisfy the new_vnode request with less latency then waiting
+ * for the full 100ms duration we're ultimately willing to tolerate
+ */
+ assert_wait_timeout((caddr_t)&dead_vnode_wanted, (THREAD_INTERRUPTIBLE), 10000, NSEC_PER_USEC);
- (void)vnode_reclaim_internal(vp, 1, 1);
+ vnode_list_unlock();
+
+ thread_block(THREAD_CONTINUE_NULL);
+
+ microuptime(&elapsed_tv);
+
+ timevalsub(&elapsed_tv, &initial_tv);
+ elapsed_msecs = elapsed_tv.tv_sec * 1000 + elapsed_tv.tv_usec / 1000;
- if ((VONLIST(vp)))
- panic("new_vnode: vp on list ");
- if (vp->v_usecount || vp->v_iocount || vp->v_kusecount ||
- (vp->v_lflag & (VNAMED_UBC | VNAMED_MOUNT | VNAMED_FSHASH)))
- panic("new_vnode: free vnode still referenced\n");
- if ((vp->v_mntvnodes.tqe_prev != 0) && (vp->v_mntvnodes.tqe_next != 0))
- panic("new_vnode: vnode seems to be on mount list ");
- if ( !LIST_EMPTY(&vp->v_nclinks) || !LIST_EMPTY(&vp->v_ncchildren))
- panic("new_vnode: vnode still hooked into the name cache");
+ if (elapsed_msecs >= 100) {
+ /*
+ * we've waited long enough... 100ms is
+ * somewhat arbitrary for this case, but the
+ * normal worst case latency used for UI
+ * interaction is 100ms, so I've chosen to
+ * go with that.
+ *
+ * setting need_reliable_vp to TRUE
+ * forces us to find a reliable vnode
+ * that we can process synchronously, or
+ * to create a new one if the scan for
+ * a reliable one hits the scan limit
+ */
+ need_reliable_vp = TRUE;
+ }
+ }
+ goto retry;
}
- if (vp->v_unsafefs) {
- lck_mtx_destroy(&vp->v_unsafefs->fsnodelock, vnode_lck_grp);
- FREE_ZONE((void *)vp->v_unsafefs, sizeof(struct unsafe_fsnode), M_UNSAFEFS);
- vp->v_unsafefs = (struct unsafe_fsnode *)NULL;
+ OSAddAtomicLong(1, &num_reusedvnodes);
+
+
+#if CONFIG_MACF
+ /*
+ * We should never see VL_LABELWAIT or VL_LABEL here.
+ * as those operations hold a reference.
+ */
+ assert ((vp->v_lflag & VL_LABELWAIT) != VL_LABELWAIT);
+ assert ((vp->v_lflag & VL_LABEL) != VL_LABEL);
+ if (vp->v_lflag & VL_LABELED) {
+ vnode_lock_convert(vp);
+ mac_vnode_label_recycle(vp);
+ } else if (mac_vnode_label_init_needed(vp)) {
+ vnode_lock_convert(vp);
+ mac_vnode_label_init(vp);
}
+
+#endif /* MAC */
+
+ vp->v_iocount = 1;
vp->v_lflag = 0;
vp->v_writecount = 0;
vp->v_references = 0;
vp->v_iterblkflags = 0;
vp->v_flag = VSTANDARD;
/* vbad vnodes can point to dead_mountp */
- vp->v_mount = 0;
+ vp->v_mount = NULL;
vp->v_defer_reclaimlist = (vnode_t)0;
vnode_unlock(vp);
+
done:
*vpp = vp;
lck_mtx_lock(&vp->v_lock);
}
+void
+vnode_lock_spin(vnode_t vp)
+{
+ lck_mtx_lock_spin(&vp->v_lock);
+}
+
void
vnode_unlock(vnode_t vp)
{
int
vnode_get(struct vnode *vp)
{
- vnode_lock(vp);
+ int retval;
- if ( (vp->v_iocount == 0) && (vp->v_lflag & (VL_TERMINATE | VL_DEAD)) ) {
- vnode_unlock(vp);
+ vnode_lock_spin(vp);
+ retval = vnode_get_locked(vp);
+ vnode_unlock(vp);
+
+ return(retval);
+}
+
+int
+vnode_get_locked(struct vnode *vp)
+{
+#if DIAGNOSTIC
+ lck_mtx_assert(&vp->v_lock, LCK_MTX_ASSERT_OWNED);
+#endif
+ if ((vp->v_iocount == 0) && (vp->v_lflag & (VL_TERMINATE | VL_DEAD))) {
return(ENOENT);
}
vp->v_iocount++;
#ifdef JOE_DEBUG
record_vp(vp, 1);
#endif
- vnode_unlock(vp);
+ return (0);
+}
- return(0);
+/*
+ * vnode_getwithvid() cuts in line in front of a vnode drain (that is,
+ * while the vnode is draining, but at no point after that) to prevent
+ * deadlocks when getting vnodes from filesystem hashes while holding
+ * resources that may prevent other iocounts from being released.
+ */
+int
+vnode_getwithvid(vnode_t vp, uint32_t vid)
+{
+ return(vget_internal(vp, vid, ( VNODE_NODEAD | VNODE_WITHID | VNODE_DRAINO )));
}
+/*
+ * vnode_getwithvid_drainok() is like vnode_getwithvid(), but *does* block behind a vnode
+ * drain; it exists for use in the VFS name cache, where we really do want to block behind
+ * vnode drain to prevent holding off an unmount.
+ */
int
-vnode_getwithvid(vnode_t vp, int vid)
+vnode_getwithvid_drainok(vnode_t vp, uint32_t vid)
{
- return(vget_internal(vp, vid, ( VNODE_NODEAD| VNODE_WITHID)));
+ return(vget_internal(vp, vid, ( VNODE_NODEAD | VNODE_WITHID )));
}
int
}
+__private_extern__ int
+vnode_getalways(vnode_t vp)
+{
+ return(vget_internal(vp, 0, VNODE_ALWAYS));
+}
+
int
vnode_put(vnode_t vp)
{
int retval;
- vnode_lock(vp);
+ vnode_lock_spin(vp);
retval = vnode_put_locked(vp);
vnode_unlock(vp);
return(retval);
}
+static inline void
+vn_set_dead(vnode_t vp)
+{
+ vp->v_mount = NULL;
+ vp->v_op = dead_vnodeop_p;
+ vp->v_tag = VT_NON;
+ vp->v_data = NULL;
+ vp->v_type = VBAD;
+ vp->v_lflag |= VL_DEAD;
+}
+
int
vnode_put_locked(vnode_t vp)
{
- struct vfs_context context;
+ vfs_context_t ctx = vfs_context_current(); /* hoist outside loop */
+#if DIAGNOSTIC
+ lck_mtx_assert(&vp->v_lock, LCK_MTX_ASSERT_OWNED);
+#endif
retry:
if (vp->v_iocount < 1)
- panic("vnode_put(%x): iocount < 1", vp);
+ panic("vnode_put(%p): iocount < 1", vp);
if ((vp->v_usecount > 0) || (vp->v_iocount > 1)) {
- vnode_dropiocount(vp, 1);
+ vnode_dropiocount(vp);
return(0);
}
- if ((vp->v_lflag & (VL_MARKTERM | VL_TERMINATE | VL_DEAD | VL_NEEDINACTIVE)) == VL_NEEDINACTIVE) {
+ if ((vp->v_lflag & (VL_DEAD | VL_NEEDINACTIVE)) == VL_NEEDINACTIVE) {
vp->v_lflag &= ~VL_NEEDINACTIVE;
vnode_unlock(vp);
- context.vc_proc = current_proc();
- context.vc_ucred = kauth_cred_get();
- VNOP_INACTIVE(vp, &context);
+ VNOP_INACTIVE(vp, ctx);
- vnode_lock(vp);
+ vnode_lock_spin(vp);
/*
* because we had to drop the vnode lock before calling
* VNOP_INACTIVE, the state of this vnode may have changed...
}
vp->v_lflag &= ~VL_NEEDINACTIVE;
- if ((vp->v_lflag & (VL_MARKTERM | VL_TERMINATE | VL_DEAD)) == VL_MARKTERM)
- vnode_reclaim_internal(vp, 1, 0);
-
- vnode_dropiocount(vp, 1);
+ if ((vp->v_lflag & (VL_MARKTERM | VL_TERMINATE | VL_DEAD)) == VL_MARKTERM) {
+ vnode_lock_convert(vp);
+ vnode_reclaim_internal(vp, 1, 1, 0);
+ }
+ vnode_dropiocount(vp);
vnode_list_add(vp);
return(0);
return(vnode_isinuse_locked(vp, refcnt, 0));
}
+int vnode_usecount(vnode_t vp)
+{
+ return vp->v_usecount;
+}
+
+int vnode_iocount(vnode_t vp)
+{
+ return vp->v_iocount;
+}
static int
vnode_isinuse_locked(vnode_t vp, int refcnt, int locked)
int retval = 0;
if (!locked)
- vnode_lock(vp);
- if ((vp->v_type != VREG) && (vp->v_usecount > refcnt)) {
+ vnode_lock_spin(vp);
+ if ((vp->v_type != VREG) && ((vp->v_usecount - vp->v_kusecount) > refcnt)) {
retval = 1;
goto out;
}
errno_t
vnode_resume(vnode_t vp)
{
+ if ((vp->v_lflag & VL_SUSPENDED) && vp->v_owner == current_thread()) {
- vnode_lock(vp);
-
- if (vp->v_owner == current_thread()) {
+ vnode_lock_spin(vp);
vp->v_lflag &= ~VL_SUSPENDED;
- vp->v_owner = 0;
+ vp->v_owner = NULL;
vnode_unlock(vp);
- wakeup(&vp->v_iocount);
- } else
- vnode_unlock(vp);
+ wakeup(&vp->v_iocount);
+ }
return(0);
}
+/* suspend vnode_t
+ * Please do not use on more than one vnode at a time as it may
+ * cause deadlocks.
+ * xxx should we explicity prevent this from happening?
+ */
+
+errno_t
+vnode_suspend(vnode_t vp)
+{
+ if (vp->v_lflag & VL_SUSPENDED) {
+ return(EBUSY);
+ }
+
+ vnode_lock_spin(vp);
+
+ /*
+ * xxx is this sufficient to check if a vnode_drain is
+ * progress?
+ */
+
+ if (vp->v_owner == NULL) {
+ vp->v_lflag |= VL_SUSPENDED;
+ vp->v_owner = current_thread();
+ }
+ vnode_unlock(vp);
+
+ return(0);
+}
+
+/*
+ * Release any blocked locking requests on the vnode.
+ * Used for forced-unmounts.
+ *
+ * XXX What about network filesystems?
+ */
+static void
+vnode_abort_advlocks(vnode_t vp)
+{
+ if (vp->v_flag & VLOCKLOCAL)
+ lf_abort_advlocks(vp);
+}
+
+
static errno_t
vnode_drain(vnode_t vp)
{
if (vp->v_lflag & VL_DRAIN) {
- panic("vnode_drain: recursuve drain");
+ panic("vnode_drain: recursive drain");
return(ENOENT);
}
vp->v_lflag |= VL_DRAIN;
vp->v_owner = current_thread();
while (vp->v_iocount > 1)
- msleep(&vp->v_iocount, &vp->v_lock, PVFS, "vnode_drain", 0);
+ msleep(&vp->v_iocount, &vp->v_lock, PVFS, "vnode_drain", NULL);
+
+ vp->v_lflag &= ~VL_DRAIN;
+
return(0);
}
/*
* if the number of recent references via vnode_getwithvid or vnode_getwithref
- * exceeds this threshhold, than 'UN-AGE' the vnode by removing it from
+ * exceeds this threshold, than 'UN-AGE' the vnode by removing it from
* the LRU list if it's currently on it... once the iocount and usecount both drop
* to 0, it will get put back on the end of the list, effectively making it younger
* this allows us to keep actively referenced vnodes in the list without having
* to constantly remove and add to the list each time a vnode w/o a usecount is
* referenced which costs us taking and dropping a global lock twice.
+ * However, if the vnode is marked DIRTY, we want to pull it out much earlier
*/
-#define UNAGE_THRESHHOLD 10
+#define UNAGE_THRESHHOLD 25
+#define UNAGE_DIRTYTHRESHHOLD 6
errno_t
-vnode_getiocount(vnode_t vp, int locked, int vid, int vflags)
+vnode_getiocount(vnode_t vp, unsigned int vid, int vflags)
{
int nodead = vflags & VNODE_NODEAD;
int nosusp = vflags & VNODE_NOSUSPEND;
-
- if (!locked)
- vnode_lock(vp);
+ int always = vflags & VNODE_ALWAYS;
+ int beatdrain = vflags & VNODE_DRAINO;
+ int withvid = vflags & VNODE_WITHID;
for (;;) {
+ int sleepflg = 0;
+
/*
* if it is a dead vnode with deadfs
*/
- if (nodead && (vp->v_lflag & VL_DEAD) && ((vp->v_type == VBAD) || (vp->v_data == 0))) {
- if (!locked)
- vnode_unlock(vp);
+ if (nodead && (vp->v_lflag & VL_DEAD) && ((vp->v_type == VBAD) || (vp->v_data == 0))) {
return(ENOENT);
}
/*
* if suspended vnodes are to be failed
*/
if (nosusp && (vp->v_lflag & VL_SUSPENDED)) {
- if (!locked)
- vnode_unlock(vp);
return(ENOENT);
}
/*
(vp->v_owner == current_thread())) {
break;
}
+
+ if (always != 0)
+ break;
+
+ /*
+ * If this vnode is getting drained, there are some cases where
+ * we can't block or, in case of tty vnodes, want to be
+ * interruptible.
+ */
+ if (vp->v_lflag & VL_DRAIN) {
+ /*
+ * In some situations, we want to get an iocount
+ * even if the vnode is draining to prevent deadlock,
+ * e.g. if we're in the filesystem, potentially holding
+ * resources that could prevent other iocounts from
+ * being released.
+ */
+ if (beatdrain)
+ break;
+ /*
+ * Don't block if the vnode's mount point is unmounting as
+ * we may be the thread the unmount is itself waiting on
+ * Only callers who pass in vids (at this point, we've already
+ * handled nosusp and nodead) are expecting error returns
+ * from this function, so only we can only return errors for
+ * those. ENODEV is intended to inform callers that the call
+ * failed because an unmount is in progress.
+ */
+ if (withvid && (vp->v_mount) && vfs_isunmount(vp->v_mount))
+ return (ENODEV);
+
+ if (vnode_istty(vp)) {
+ sleepflg = PCATCH;
+ }
+ }
+
+ vnode_lock_convert(vp);
+
if (vp->v_lflag & VL_TERMINATE) {
+ int error;
+
vp->v_lflag |= VL_TERMWANT;
- msleep(&vp->v_lflag, &vp->v_lock, PVFS, "vnode getiocount", 0);
+ error = msleep(&vp->v_lflag, &vp->v_lock,
+ (PVFS | sleepflg), "vnode getiocount", NULL);
+ if (error)
+ return (error);
} else
- msleep(&vp->v_iocount, &vp->v_lock, PVFS, "vnode_getiocount", 0);
+ msleep(&vp->v_iocount, &vp->v_lock, PVFS, "vnode_getiocount", NULL);
}
- if (vid != vp->v_id) {
- if (!locked)
- vnode_unlock(vp);
+ if (withvid && vid != vp->v_id) {
return(ENOENT);
}
- if (++vp->v_references >= UNAGE_THRESHHOLD) {
+ if (++vp->v_references >= UNAGE_THRESHHOLD ||
+ (vp->v_flag & VISDIRTY && vp->v_references >= UNAGE_DIRTYTHRESHHOLD)) {
vp->v_references = 0;
vnode_list_remove(vp);
}
#ifdef JOE_DEBUG
record_vp(vp, 1);
#endif
- if (!locked)
- vnode_unlock(vp);
return(0);
}
static void
-vnode_dropiocount (vnode_t vp, int locked)
+vnode_dropiocount (vnode_t vp)
{
- if (!locked)
- vnode_lock(vp);
if (vp->v_iocount < 1)
- panic("vnode_dropiocount(%x): v_iocount < 1", vp);
+ panic("vnode_dropiocount(%p): v_iocount < 1", vp);
vp->v_iocount--;
#ifdef JOE_DEBUG
#endif
if ((vp->v_lflag & (VL_DRAIN | VL_SUSPENDED)) && (vp->v_iocount <= 1))
wakeup(&vp->v_iocount);
-
- if (!locked)
- vnode_unlock(vp);
}
void
vnode_reclaim(struct vnode * vp)
{
- vnode_reclaim_internal(vp, 0, 0);
+ vnode_reclaim_internal(vp, 0, 0, 0);
}
__private_extern__
void
-vnode_reclaim_internal(struct vnode * vp, int locked, int reuse)
+vnode_reclaim_internal(struct vnode * vp, int locked, int reuse, int flags)
{
int isfifo = 0;
}
vp->v_lflag |= VL_TERMINATE;
- if (vnode_drain(vp)) {
- panic("vnode drain failed");
- vnode_unlock(vp);
- return;
- }
+ vn_clearunionwait(vp, 1);
+
+ vnode_drain(vp);
+
isfifo = (vp->v_type == VFIFO);
if (vp->v_type != VBAD)
- vgone(vp); /* clean and reclaim the vnode */
+ vgone(vp, flags); /* clean and reclaim the vnode */
/*
- * give the vnode a new identity so
- * that vnode_getwithvid will fail
- * on any stale cache accesses
+ * give the vnode a new identity so that vnode_getwithvid will fail
+ * on any stale cache accesses...
+ * grab the list_lock so that if we're in "new_vnode"
+ * behind the list_lock trying to steal this vnode, the v_id is stable...
+ * once new_vnode drops the list_lock, it will block trying to take
+ * the vnode lock until we release it... at that point it will evaluate
+ * whether the v_vid has changed
+ * also need to make sure that the vnode isn't on a list where "new_vnode"
+ * can find it after the v_id has been bumped until we are completely done
+ * with the vnode (i.e. putting it back on a list has to be the very last
+ * thing we do to this vnode... many of the callers of vnode_reclaim_internal
+ * are holding an io_count on the vnode... they need to drop the io_count
+ * BEFORE doing a vnode_list_add or make sure to hold the vnode lock until
+ * they are completely done with the vnode
*/
+ vnode_list_lock();
+
+ vnode_list_remove_locked(vp);
vp->v_id++;
+
+ vnode_list_unlock();
+
if (isfifo) {
struct fifoinfo * fip;
vp->v_fifoinfo = NULL;
FREE(fip, M_TEMP);
}
-
vp->v_type = VBAD;
if (vp->v_data)
panic("vnode_reclaim_internal: cleaned vnode isn't");
if (vp->v_numoutput)
- panic("vnode_reclaim_internal: Clean vnode has pending I/O's");
+ panic("vnode_reclaim_internal: clean vnode has pending I/O's");
if (UBCINFOEXISTS(vp))
panic("vnode_reclaim_internal: ubcinfo not cleaned");
if (vp->v_parent)
if (vp->v_name)
panic("vnode_reclaim_internal: vname not removed");
- vp->v_socket = 0;
+ vp->v_socket = NULL;
vp->v_lflag &= ~VL_TERMINATE;
- vp->v_lflag &= ~VL_DRAIN;
- vp->v_owner = 0;
+ vp->v_owner = NULL;
+
+ KNOTE(&vp->v_knotes, NOTE_REVOKE);
+
+ /* Make sure that when we reuse the vnode, no knotes left over */
+ klist_init(&vp->v_knotes);
if (vp->v_lflag & VL_TERMWANT) {
vp->v_lflag &= ~VL_TERMWANT;
wakeup(&vp->v_lflag);
}
- if (!reuse && vp->v_usecount == 0)
+ if (!reuse) {
+ /*
+ * make sure we get on the
+ * dead list if appropriate
+ */
vnode_list_add(vp);
+ }
if (!locked)
vnode_unlock(vp);
}
-/* USAGE:
- * The following api creates a vnode and associates all the parameter specified in vnode_fsparam
- * structure and returns a vnode handle with a reference. device aliasing is handled here so checkalias
- * is obsoleted by this.
- * vnode_create(int flavor, size_t size, void * param, vnode_t *vp)
- */
-int
-vnode_create(int flavor, size_t size, void *data, vnode_t *vpp)
+static int
+vnode_create_internal(uint32_t flavor, uint32_t size, void *data, vnode_t *vpp,
+ int init_vnode)
{
int error;
int insert = 1;
+ int existing_vnode;
vnode_t vp;
vnode_t nvp;
vnode_t dvp;
+ struct uthread *ut;
struct componentname *cnp;
struct vnode_fsparam *param = (struct vnode_fsparam *)data;
-
- if (flavor == VNCREATE_FLAVOR && (size == VCREATESIZE) && param) {
- if ( (error = new_vnode(&vp)) ) {
- return(error);
- } else {
- dvp = param->vnfs_dvp;
- cnp = param->vnfs_cnp;
+#if CONFIG_TRIGGERS
+ struct vnode_trigger_param *tinfo = NULL;
+#endif
+ if (*vpp) {
+ vp = *vpp;
+ *vpp = NULLVP;
+ existing_vnode = 1;
+ } else {
+ existing_vnode = 0;
+ }
- vp->v_op = param->vnfs_vops;
- vp->v_type = param->vnfs_vtype;
- vp->v_data = param->vnfs_fsnode;
- vp->v_iocount = 1;
+ if (init_vnode) {
+ /* Do quick sanity check on the parameters. */
+ if ((param == NULL) || (param->vnfs_vtype == VBAD)) {
+ error = EINVAL;
+ goto error_out;
+ }
- if (param->vnfs_markroot)
- vp->v_flag |= VROOT;
- if (param->vnfs_marksystem)
- vp->v_flag |= VSYSTEM;
- else if (vp->v_type == VREG) {
- /*
- * only non SYSTEM vp
- */
- error = ubc_info_init_withsize(vp, param->vnfs_filesize);
- if (error) {
+#if CONFIG_TRIGGERS
+ if ((flavor == VNCREATE_TRIGGER) && (size == VNCREATE_TRIGGER_SIZE)) {
+ tinfo = (struct vnode_trigger_param *)data;
+
+ /* Validate trigger vnode input */
+ if ((param->vnfs_vtype != VDIR) ||
+ (tinfo->vnt_resolve_func == NULL) ||
+ (tinfo->vnt_flags & ~VNT_VALID_MASK)) {
+ error = EINVAL;
+ goto error_out;
+ }
+ /* Fall through a normal create (params will be the same) */
+ flavor = VNCREATE_FLAVOR;
+ size = VCREATESIZE;
+ }
+#endif
+ if ((flavor != VNCREATE_FLAVOR) || (size != VCREATESIZE)) {
+ error = EINVAL;
+ goto error_out;
+ }
+ }
+
+ if (!existing_vnode) {
+ if ((error = new_vnode(&vp)) ) {
+ return (error);
+ }
+ if (!init_vnode) {
+ /* Make it so that it can be released by a vnode_put) */
+ vn_set_dead(vp);
+ *vpp = vp;
+ return (0);
+ }
+ } else {
+ /*
+ * A vnode obtained by vnode_create_empty has been passed to
+ * vnode_initialize - Unset VL_DEAD set by vn_set_dead. After
+ * this point, it is set back on any error.
+ *
+ * N.B. vnode locking - We make the same assumptions as the
+ * "unsplit" vnode_create did - i.e. it is safe to update the
+ * vnode's fields without the vnode lock. This vnode has been
+ * out and about with the filesystem and hopefully nothing
+ * was done to the vnode between the vnode_create_empty and
+ * now when it has come in through vnode_initialize.
+ */
+ vp->v_lflag &= ~VL_DEAD;
+ }
+
+ dvp = param->vnfs_dvp;
+ cnp = param->vnfs_cnp;
+
+ vp->v_op = param->vnfs_vops;
+ vp->v_type = param->vnfs_vtype;
+ vp->v_data = param->vnfs_fsnode;
+
+ if (param->vnfs_markroot)
+ vp->v_flag |= VROOT;
+ if (param->vnfs_marksystem)
+ vp->v_flag |= VSYSTEM;
+ if (vp->v_type == VREG) {
+ error = ubc_info_init_withsize(vp, param->vnfs_filesize);
+ if (error) {
#ifdef JOE_DEBUG
- record_vp(vp, 1);
+ record_vp(vp, 1);
#endif
- vp->v_mount = 0;
- vp->v_op = dead_vnodeop_p;
- vp->v_tag = VT_NON;
- vp->v_data = NULL;
- vp->v_type = VBAD;
- vp->v_lflag |= VL_DEAD;
-
- vnode_put(vp);
- return(error);
- }
- }
+ vn_set_dead(vp);
+
+ vnode_put(vp);
+ return(error);
+ }
+ if (param->vnfs_mp->mnt_ioflags & MNT_IOFLAGS_IOSCHED_SUPPORTED)
+ memory_object_mark_io_tracking(vp->v_ubcinfo->ui_control);
+ }
+#ifdef JOE_DEBUG
+ record_vp(vp, 1);
+#endif
+
+#if CONFIG_TRIGGERS
+ /*
+ * For trigger vnodes, attach trigger info to vnode
+ */
+ if ((vp->v_type == VDIR) && (tinfo != NULL)) {
+ /*
+ * Note: has a side effect of incrementing trigger count on the
+ * mount if successful, which we would need to undo on a
+ * subsequent failure.
+ */
+#ifdef JOE_DEBUG
+ record_vp(vp, -1);
+#endif
+ error = vnode_resolver_create(param->vnfs_mp, vp, tinfo, FALSE);
+ if (error) {
+ printf("vnode_create: vnode_resolver_create() err %d\n", error);
+ vn_set_dead(vp);
#ifdef JOE_DEBUG
record_vp(vp, 1);
#endif
- if (vp->v_type == VCHR || vp->v_type == VBLK) {
-
- if ( (nvp = checkalias(vp, param->vnfs_rdev)) ) {
- /*
- * if checkalias returns a vnode, it will be locked
- *
- * first get rid of the unneeded vnode we acquired
- */
- vp->v_data = NULL;
- vp->v_op = spec_vnodeop_p;
- vp->v_type = VBAD;
- vp->v_lflag = VL_DEAD;
- vp->v_data = NULL;
- vp->v_tag = VT_NON;
- vnode_put(vp);
+ vnode_put(vp);
+ return (error);
+ }
+ }
+#endif
+ if (vp->v_type == VCHR || vp->v_type == VBLK) {
- /*
- * switch to aliased vnode and finish
- * preparing it
- */
- vp = nvp;
-
- vclean(vp, 0, current_proc());
- vp->v_op = param->vnfs_vops;
- vp->v_type = param->vnfs_vtype;
- vp->v_data = param->vnfs_fsnode;
- vp->v_lflag = 0;
- vp->v_mount = NULL;
- insmntque(vp, param->vnfs_mp);
- insert = 0;
- vnode_unlock(vp);
- }
- }
+ vp->v_tag = VT_DEVFS; /* callers will reset if needed (bdevvp) */
- if (vp->v_type == VFIFO) {
- struct fifoinfo *fip;
+ if ( (nvp = checkalias(vp, param->vnfs_rdev)) ) {
+ /*
+ * if checkalias returns a vnode, it will be locked
+ *
+ * first get rid of the unneeded vnode we acquired
+ */
+ vp->v_data = NULL;
+ vp->v_op = spec_vnodeop_p;
+ vp->v_type = VBAD;
+ vp->v_lflag = VL_DEAD;
+ vp->v_data = NULL;
+ vp->v_tag = VT_NON;
+ vnode_put(vp);
- MALLOC(fip, struct fifoinfo *,
- sizeof(*fip), M_TEMP, M_WAITOK);
- bzero(fip, sizeof(struct fifoinfo ));
- vp->v_fifoinfo = fip;
- }
- /* The file systems usually pass the address of the location where
- * where there store the vnode pointer. When we add the vnode in mount
- * point and name cache they are discoverable. So the file system node
- * will have the connection to vnode setup by then
+ /*
+ * switch to aliased vnode and finish
+ * preparing it
*/
- *vpp = vp;
+ vp = nvp;
- if (param->vnfs_mp) {
- if (param->vnfs_mp->mnt_kern_flag & MNTK_LOCK_LOCAL)
- vp->v_flag |= VLOCKLOCAL;
- if (insert) {
- /*
- * enter in mount vnode list
- */
- insmntque(vp, param->vnfs_mp);
- }
-#ifdef INTERIM_FSNODE_LOCK
- if (param->vnfs_mp->mnt_vtable->vfc_threadsafe == 0) {
- MALLOC_ZONE(vp->v_unsafefs, struct unsafe_fsnode *,
- sizeof(struct unsafe_fsnode), M_UNSAFEFS, M_WAITOK);
- vp->v_unsafefs->fsnode_count = 0;
- vp->v_unsafefs->fsnodeowner = (void *)NULL;
- lck_mtx_init(&vp->v_unsafefs->fsnodelock, vnode_lck_grp, vnode_lck_attr);
- }
-#endif /* INTERIM_FSNODE_LOCK */
- }
- if (dvp && vnode_ref(dvp) == 0) {
- vp->v_parent = dvp;
- }
- if (cnp) {
- if (dvp && ((param->vnfs_flags & (VNFS_NOCACHE | VNFS_CANTCACHE)) == 0)) {
- /*
- * enter into name cache
- * we've got the info to enter it into the name cache now
- */
- cache_enter(dvp, vp, cnp);
- }
- vp->v_name = vfs_addname(cnp->cn_nameptr, cnp->cn_namelen, cnp->cn_hash, 0);
- }
- if ((param->vnfs_flags & VNFS_CANTCACHE) == 0) {
- /*
- * this vnode is being created as cacheable in the name cache
- * this allows us to re-enter it in the cache
- */
- vp->v_flag |= VNCACHEABLE;
- }
- if ((vp->v_flag & VSYSTEM) && (vp->v_type != VREG))
- panic("incorrect vnode setup");
+ vclean(vp, 0);
+ vp->v_op = param->vnfs_vops;
+ vp->v_type = param->vnfs_vtype;
+ vp->v_data = param->vnfs_fsnode;
+ vp->v_lflag = 0;
+ vp->v_mount = NULL;
+ insmntque(vp, param->vnfs_mp);
+ insert = 0;
+ vnode_unlock(vp);
+ }
- return(0);
+ if (VCHR == vp->v_type) {
+ u_int maj = major(vp->v_rdev);
+
+ if (maj < (u_int)nchrdev && cdevsw[maj].d_type == D_TTY)
+ vp->v_flag |= VISTTY;
}
}
- return (EINVAL);
+
+ if (vp->v_type == VFIFO) {
+ struct fifoinfo *fip;
+
+ MALLOC(fip, struct fifoinfo *,
+ sizeof(*fip), M_TEMP, M_WAITOK);
+ bzero(fip, sizeof(struct fifoinfo ));
+ vp->v_fifoinfo = fip;
+ }
+ /* The file systems must pass the address of the location where
+ * they store the vnode pointer. When we add the vnode into the mount
+ * list and name cache they become discoverable. So the file system node
+ * must have the connection to vnode setup by then
+ */
+ *vpp = vp;
+
+ /* Add fs named reference. */
+ if (param->vnfs_flags & VNFS_ADDFSREF) {
+ vp->v_lflag |= VNAMED_FSHASH;
+ }
+ if (param->vnfs_mp) {
+ if (param->vnfs_mp->mnt_kern_flag & MNTK_LOCK_LOCAL)
+ vp->v_flag |= VLOCKLOCAL;
+ if (insert) {
+ if ((vp->v_freelist.tqe_prev != (struct vnode **)0xdeadb))
+ panic("insmntque: vp on the free list\n");
+
+ /*
+ * enter in mount vnode list
+ */
+ insmntque(vp, param->vnfs_mp);
+ }
+ }
+ if (dvp && vnode_ref(dvp) == 0) {
+ vp->v_parent = dvp;
+ }
+ if (cnp) {
+ if (dvp && ((param->vnfs_flags & (VNFS_NOCACHE | VNFS_CANTCACHE)) == 0)) {
+ /*
+ * enter into name cache
+ * we've got the info to enter it into the name cache now
+ * cache_enter_create will pick up an extra reference on
+ * the name entered into the string cache
+ */
+ vp->v_name = cache_enter_create(dvp, vp, cnp);
+ } else
+ vp->v_name = vfs_addname(cnp->cn_nameptr, cnp->cn_namelen, cnp->cn_hash, 0);
+
+ if ((cnp->cn_flags & UNIONCREATED) == UNIONCREATED)
+ vp->v_flag |= VISUNION;
+ }
+ if ((param->vnfs_flags & VNFS_CANTCACHE) == 0) {
+ /*
+ * this vnode is being created as cacheable in the name cache
+ * this allows us to re-enter it in the cache
+ */
+ vp->v_flag |= VNCACHEABLE;
+ }
+ ut = get_bsdthread_info(current_thread());
+
+ if ((current_proc()->p_lflag & P_LRAGE_VNODES) ||
+ (ut->uu_flag & UT_RAGE_VNODES)) {
+ /*
+ * process has indicated that it wants any
+ * vnodes created on its behalf to be rapidly
+ * aged to reduce the impact on the cached set
+ * of vnodes
+ */
+ vp->v_flag |= VRAGE;
+ }
+
+#if CONFIG_SECLUDED_MEMORY
+ switch (secluded_for_filecache) {
+ case 0:
+ /*
+ * secluded_for_filecache == 0:
+ * + no file contents in secluded pool
+ */
+ break;
+ case 1:
+ /*
+ * secluded_for_filecache == 1:
+ * + no files from /
+ * + files from /Applications/ are OK
+ * + files from /Applications/Camera are not OK
+ * + no files that are open for write
+ */
+ if (vnode_vtype(vp) == VREG &&
+ vnode_mount(vp) != NULL &&
+ (! (vfs_flags(vnode_mount(vp)) & MNT_ROOTFS))) {
+ /* not from root filesystem: eligible for secluded pages */
+ memory_object_mark_eligible_for_secluded(
+ ubc_getobject(vp, UBC_FLAGS_NONE),
+ TRUE);
+ }
+ break;
+ case 2:
+ /*
+ * secluded_for_filecache == 2:
+ * + all read-only files OK, except:
+ * + dyld_shared_cache_arm64*
+ * + Camera
+ * + mediaserverd
+ */
+ if (vnode_vtype(vp) == VREG) {
+ memory_object_mark_eligible_for_secluded(
+ ubc_getobject(vp, UBC_FLAGS_NONE),
+ TRUE);
+ }
+ break;
+ default:
+ break;
+ }
+#endif /* CONFIG_SECLUDED_MEMORY */
+
+ return (0);
+
+error_out:
+ if (existing_vnode) {
+ vnode_put(vp);
+ }
+ return (error);
+}
+
+/* USAGE:
+ * The following api creates a vnode and associates all the parameter specified in vnode_fsparam
+ * structure and returns a vnode handle with a reference. device aliasing is handled here so checkalias
+ * is obsoleted by this.
+ */
+int
+vnode_create(uint32_t flavor, uint32_t size, void *data, vnode_t *vpp)
+{
+ *vpp = NULLVP;
+ return (vnode_create_internal(flavor, size, data, vpp, 1));
+}
+
+int
+vnode_create_empty(vnode_t *vpp)
+{
+ *vpp = NULLVP;
+ return (vnode_create_internal(VNCREATE_FLAVOR, VCREATESIZE, NULL,
+ vpp, 0));
+}
+
+int
+vnode_initialize(uint32_t flavor, uint32_t size, void *data, vnode_t *vpp)
+{
+ if (*vpp == NULLVP) {
+ panic("NULL vnode passed to vnode_initialize");
+ }
+#if DEVELOPMENT || DEBUG
+ /*
+ * We lock to check that vnode is fit for unlocked use in
+ * vnode_create_internal.
+ */
+ vnode_lock_spin(*vpp);
+ VNASSERT(((*vpp)->v_iocount == 1), *vpp,
+ ("vnode_initialize : iocount not 1, is %d", (*vpp)->v_iocount));
+ VNASSERT(((*vpp)->v_usecount == 0), *vpp,
+ ("vnode_initialize : usecount not 0, is %d", (*vpp)->v_usecount));
+ VNASSERT(((*vpp)->v_lflag & VL_DEAD), *vpp,
+ ("vnode_initialize : v_lflag does not have VL_DEAD, is 0x%x",
+ (*vpp)->v_lflag));
+ VNASSERT(((*vpp)->v_data == NULL), *vpp,
+ ("vnode_initialize : v_data not NULL"));
+ vnode_unlock(*vpp);
+#endif
+ return (vnode_create_internal(flavor, size, data, vpp, 1));
}
int
vnode_addfsref(vnode_t vp)
{
- vnode_lock(vp);
+ vnode_lock_spin(vp);
if (vp->v_lflag & VNAMED_FSHASH)
panic("add_fsref: vp already has named reference");
if ((vp->v_freelist.tqe_prev != (struct vnode **)0xdeadb))
int
vnode_removefsref(vnode_t vp)
{
- vnode_lock(vp);
+ vnode_lock_spin(vp);
if ((vp->v_lflag & VNAMED_FSHASH) == 0)
panic("remove_fsref: no named reference");
vp->v_lflag &= ~VNAMED_FSHASH;
int
-vfs_iterate(__unused int flags, int (*callout)(mount_t, void *), void *arg)
+vfs_iterate(int flags, int (*callout)(mount_t, void *), void *arg)
{
mount_t mp;
int ret = 0;
fsid_t * fsid_list;
int count, actualcount, i;
void * allocmem;
+ int indx_start, indx_stop, indx_incr;
+ int cb_dropref = (flags & VFS_ITERATE_CB_DROPREF);
count = mount_getvfscnt();
count += 10;
actualcount = mount_fillfsids(fsid_list, count);
- for (i=0; i< actualcount; i++) {
+ /*
+ * Establish the iteration direction
+ * VFS_ITERATE_TAIL_FIRST overrides default head first order (oldest first)
+ */
+ if (flags & VFS_ITERATE_TAIL_FIRST) {
+ indx_start = actualcount - 1;
+ indx_stop = -1;
+ indx_incr = -1;
+ } else /* Head first by default */ {
+ indx_start = 0;
+ indx_stop = actualcount;
+ indx_incr = 1;
+ }
+
+ for (i=indx_start; i != indx_stop; i += indx_incr) {
/* obtain the mount point with iteration reference */
mp = mount_list_lookupby_fsid(&fsid_list[i], 0, 1);
/* iterate over all the vnodes */
ret = callout(mp, arg);
- mount_iterdrop(mp);
+ /*
+ * Drop the iterref here if the callback didn't do it.
+ * Note: If cb_dropref is set the mp may no longer exist.
+ */
+ if (!cb_dropref)
+ mount_iterdrop(mp);
switch (ret) {
case VFS_RETURNED:
/*
* Update the vfsstatfs structure in the mountpoint.
+ * MAC: Parameter eventtype added, indicating whether the event that
+ * triggered this update came from user space, via a system call
+ * (VFS_USER_EVENT) or an internal kernel call (VFS_KERNEL_EVENT).
*/
int
-vfs_update_vfsstat(mount_t mp, vfs_context_t ctx)
+vfs_update_vfsstat(mount_t mp, vfs_context_t ctx, __unused int eventtype)
{
struct vfs_attr va;
int error;
VFSATTR_WANTED(&va, f_ffree);
VFSATTR_WANTED(&va, f_bsize);
VFSATTR_WANTED(&va, f_fssubtype);
+
if ((error = vfs_getattr(mp, &va, ctx)) != 0) {
KAUTH_DEBUG("STAT - filesystem returned error %d", error);
return(error);
}
-
+#if CONFIG_MACF
+ if (eventtype == VFS_USER_EVENT) {
+ error = mac_mount_check_getattr(ctx, mp, &va);
+ if (error != 0)
+ return (error);
+ }
+#endif
/*
* Unpack into the per-mount structure.
*
*
*/
if (VFSATTR_IS_SUPPORTED(&va, f_bsize)) {
- mp->mnt_vfsstat.f_bsize = va.f_bsize;
+ /* 4822056 - protect against malformed server mount */
+ mp->mnt_vfsstat.f_bsize = (va.f_bsize > 0 ? va.f_bsize : 512);
} else {
mp->mnt_vfsstat.f_bsize = mp->mnt_devblocksize; /* default from the device block size */
}
return(0);
}
-void
+int
mount_list_add(mount_t mp)
{
+ int res;
+
mount_list_lock();
- TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
- nummounts++;
+ if (system_inshutdown != 0) {
+ res = -1;
+ } else {
+ TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
+ nummounts++;
+ res = 0;
+ }
mount_list_unlock();
+
+ return res;
}
void
mount_list_lock();
TAILQ_REMOVE(&mountlist, mp, mnt_list);
nummounts--;
- mp->mnt_list.tqe_next = 0;
- mp->mnt_list.tqe_prev = 0;
+ mp->mnt_list.tqe_next = NULL;
+ mp->mnt_list.tqe_prev = NULL;
mount_list_unlock();
}
mount_lookupby_volfsid(int volfs_id, int withref)
{
mount_t cur_mount = (mount_t)0;
- mount_t mp ;
+ mount_t mp;
mount_list_lock();
- TAILQ_FOREACH(mp, &mountlist, mnt_list) {
- if (validfsnode(mp) && mp->mnt_vfsstat.f_fsid.val[0] == volfs_id) {
- cur_mount = mp;
+ TAILQ_FOREACH(mp, &mountlist, mnt_list) {
+ if (!(mp->mnt_kern_flag & MNTK_UNMOUNT) &&
+ (mp->mnt_kern_flag & MNTK_PATH_FROM_ID) &&
+ (mp->mnt_vfsstat.f_fsid.val[0] == volfs_id)) {
+ cur_mount = mp;
if (withref) {
if (mount_iterref(cur_mount, 1)) {
cur_mount = (mount_t)0;
goto out;
}
}
- break;
- }
+ break;
+ }
}
mount_list_unlock();
if (withref && (cur_mount != (mount_t)0)) {
mp = cur_mount;
if (vfs_busy(mp, LK_NOWAIT) != 0) {
cur_mount = (mount_t)0;
- }
+ }
mount_iterdrop(mp);
}
out:
return(cur_mount);
}
-
mount_t
-mount_list_lookupby_fsid(fsid, locked, withref)
- fsid_t *fsid;
- int locked;
- int withref;
+mount_list_lookupby_fsid(fsid_t *fsid, int locked, int withref)
{
mount_t retmp = (mount_t)0;
mount_t mp;
}
errno_t
-vnode_lookup(const char *path, int flags, vnode_t *vpp, vfs_context_t context)
+vnode_lookup(const char *path, int flags, vnode_t *vpp, vfs_context_t ctx)
{
struct nameidata nd;
int error;
- struct vfs_context context2;
- vfs_context_t ctx = context;
- u_long ndflags = 0;
+ u_int32_t ndflags = 0;
- if (context == NULL) { /* XXX technically an error */
- context2.vc_proc = current_proc();
- context2.vc_ucred = kauth_cred_get();
- ctx = &context2;
+ if (ctx == NULL) {
+ return EINVAL;
}
if (flags & VNODE_LOOKUP_NOFOLLOW)
if (flags & VNODE_LOOKUP_NOCROSSMOUNT)
ndflags |= NOCROSSMOUNT;
- if (flags & VNODE_LOOKUP_DOWHITEOUT)
- ndflags |= DOWHITEOUT;
+
+ if (flags & VNODE_LOOKUP_CROSSMOUNTNOWAIT)
+ ndflags |= CN_NBMOUNTLOOK;
/* XXX AUDITVNPATH1 needed ? */
- NDINIT(&nd, LOOKUP, ndflags, UIO_SYSSPACE, CAST_USER_ADDR_T(path), ctx);
+ NDINIT(&nd, LOOKUP, OP_LOOKUP, ndflags, UIO_SYSSPACE,
+ CAST_USER_ADDR_T(path), ctx);
if ((error = namei(&nd)))
return (error);
}
errno_t
-vnode_open(const char *path, int fmode, int cmode, int flags, vnode_t *vpp, vfs_context_t context)
+vnode_open(const char *path, int fmode, int cmode, int flags, vnode_t *vpp, vfs_context_t ctx)
{
struct nameidata nd;
int error;
- struct vfs_context context2;
- vfs_context_t ctx = context;
- u_long ndflags = 0;
+ u_int32_t ndflags = 0;
int lflags = flags;
- if (context == NULL) { /* XXX technically an error */
- context2.vc_proc = current_proc();
- context2.vc_ucred = kauth_cred_get();
- ctx = &context2;
+ if (ctx == NULL) { /* XXX technically an error */
+ ctx = vfs_context_current();
}
if (fmode & O_NOFOLLOW)
if (lflags & VNODE_LOOKUP_NOCROSSMOUNT)
ndflags |= NOCROSSMOUNT;
- if (lflags & VNODE_LOOKUP_DOWHITEOUT)
- ndflags |= DOWHITEOUT;
+ if (lflags & VNODE_LOOKUP_CROSSMOUNTNOWAIT)
+ ndflags |= CN_NBMOUNTLOOK;
+
/* XXX AUDITVNPATH1 needed ? */
- NDINIT(&nd, LOOKUP, ndflags, UIO_SYSSPACE, CAST_USER_ADDR_T(path), ctx);
+ NDINIT(&nd, LOOKUP, OP_OPEN, ndflags, UIO_SYSSPACE,
+ CAST_USER_ADDR_T(path), ctx);
if ((error = vn_open(&nd, fmode, cmode)))
*vpp = NULL;
}
errno_t
-vnode_close(vnode_t vp, int flags, vfs_context_t context)
+vnode_close(vnode_t vp, int flags, vfs_context_t ctx)
{
- kauth_cred_t cred;
- struct proc *p;
int error;
- if (context) {
- p = context->vc_proc;
- cred = context->vc_ucred;
- } else {
- p = current_proc();
- cred = kauth_cred_get();
+ if (ctx == NULL) {
+ ctx = vfs_context_current();
}
- error = vn_close(vp, flags, cred, p);
+ error = vn_close(vp, flags, ctx);
vnode_put(vp);
return (error);
}
+errno_t
+vnode_mtime(vnode_t vp, struct timespec *mtime, vfs_context_t ctx)
+{
+ struct vnode_attr va;
+ int error;
+
+ VATTR_INIT(&va);
+ VATTR_WANTED(&va, va_modify_time);
+ error = vnode_getattr(vp, &va, ctx);
+ if (!error)
+ *mtime = va.va_modify_time;
+ return error;
+}
+
+errno_t
+vnode_flags(vnode_t vp, uint32_t *flags, vfs_context_t ctx)
+{
+ struct vnode_attr va;
+ int error;
+
+ VATTR_INIT(&va);
+ VATTR_WANTED(&va, va_flags);
+ error = vnode_getattr(vp, &va, ctx);
+ if (!error)
+ *flags = va.va_flags;
+ return error;
+}
+
+/*
+ * Returns: 0 Success
+ * vnode_getattr:???
+ */
errno_t
vnode_size(vnode_t vp, off_t *sizep, vfs_context_t ctx)
{
return(vnode_setattr(vp, &va, ctx));
}
+int
+vnode_setdirty(vnode_t vp)
+{
+ vnode_lock_spin(vp);
+ vp->v_flag |= VISDIRTY;
+ vnode_unlock(vp);
+ return 0;
+}
+
+int
+vnode_cleardirty(vnode_t vp)
+{
+ vnode_lock_spin(vp);
+ vp->v_flag &= ~VISDIRTY;
+ vnode_unlock(vp);
+ return 0;
+}
+
+int
+vnode_isdirty(vnode_t vp)
+{
+ int dirty;
+
+ vnode_lock_spin(vp);
+ dirty = (vp->v_flag & VISDIRTY) ? 1 : 0;
+ vnode_unlock(vp);
+
+ return dirty;
+}
+
+static int
+vn_create_reg(vnode_t dvp, vnode_t *vpp, struct nameidata *ndp, struct vnode_attr *vap, uint32_t flags, int fmode, uint32_t *statusp, vfs_context_t ctx)
+{
+ /* Only use compound VNOP for compound operation */
+ if (vnode_compound_open_available(dvp) && ((flags & VN_CREATE_DOOPEN) != 0)) {
+ *vpp = NULLVP;
+ return VNOP_COMPOUND_OPEN(dvp, vpp, ndp, O_CREAT, fmode, statusp, vap, ctx);
+ } else {
+ return VNOP_CREATE(dvp, vpp, &ndp->ni_cnd, vap, ctx);
+ }
+}
+
/*
* Create a filesystem object of arbitrary type with arbitrary attributes in
* the spevied directory with the specified name.
* in the code they originated.
*/
errno_t
-vn_create(vnode_t dvp, vnode_t *vpp, struct componentname *cnp, struct vnode_attr *vap, int flags, vfs_context_t ctx)
+vn_create(vnode_t dvp, vnode_t *vpp, struct nameidata *ndp, struct vnode_attr *vap, uint32_t flags, int fmode, uint32_t *statusp, vfs_context_t ctx)
{
- kauth_acl_t oacl, nacl;
- int initial_acl;
- errno_t error;
+ errno_t error, old_error;
vnode_t vp = (vnode_t)0;
+ boolean_t batched;
+ struct componentname *cnp;
+ uint32_t defaulted;
+ cnp = &ndp->ni_cnd;
error = 0;
- oacl = nacl = NULL;
- initial_acl = 0;
+ batched = namei_compound_available(dvp, ndp) ? TRUE : FALSE;
KAUTH_DEBUG("%p CREATE - '%s'", dvp, cnp->cn_nameptr);
+ if (flags & VN_CREATE_NOINHERIT)
+ vap->va_vaflags |= VA_NOINHERIT;
+ if (flags & VN_CREATE_NOAUTH)
+ vap->va_vaflags |= VA_NOAUTH;
/*
- * Handle ACL inheritance.
+ * Handle ACL inheritance, initialize vap.
*/
- if (!(flags & VN_CREATE_NOINHERIT) && vfs_extendedsecurity(dvp->v_mount)) {
- /* save the original filesec */
- if (VATTR_IS_ACTIVE(vap, va_acl)) {
- initial_acl = 1;
- oacl = vap->va_acl;
- }
-
- vap->va_acl = NULL;
- if ((error = kauth_acl_inherit(dvp,
- oacl,
- &nacl,
- vap->va_type == VDIR,
- ctx)) != 0) {
- KAUTH_DEBUG("%p CREATE - error %d processing inheritance", dvp, error);
- return(error);
- }
+ error = vn_attribute_prepare(dvp, vap, &defaulted, ctx);
+ if (error) {
+ return error;
+ }
- /*
- * If the generated ACL is NULL, then we can save ourselves some effort
- * by clearing the active bit.
- */
- if (nacl == NULL) {
- VATTR_CLEAR_ACTIVE(vap, va_acl);
- } else {
- VATTR_SET(vap, va_acl, nacl);
- }
+ if (vap->va_type != VREG && (fmode != 0 || (flags & VN_CREATE_DOOPEN) || statusp)) {
+ panic("Open parameters, but not a regular file.");
}
-
- /*
- * Check and default new attributes.
- * This will set va_uid, va_gid, va_mode and va_create_time at least, if the caller
- * hasn't supplied them.
- */
- if ((error = vnode_authattr_new(dvp, vap, flags & VN_CREATE_NOAUTH, ctx)) != 0) {
- KAUTH_DEBUG("%p CREATE - error %d handing/defaulting attributes", dvp, error);
- goto out;
+ if ((fmode != 0) && ((flags & VN_CREATE_DOOPEN) == 0)) {
+ panic("Mode for open, but not trying to open...");
}
-
+
/*
* Create the requested node.
*/
switch(vap->va_type) {
case VREG:
- error = VNOP_CREATE(dvp, vpp, cnp, vap, ctx);
+ error = vn_create_reg(dvp, vpp, ndp, vap, flags, fmode, statusp, ctx);
break;
case VDIR:
- error = VNOP_MKDIR(dvp, vpp, cnp, vap, ctx);
+ error = vn_mkdir(dvp, vpp, ndp, vap, ctx);
break;
case VSOCK:
case VFIFO:
}
vp = *vpp;
+ old_error = error;
+
+#if CONFIG_MACF
+ if (!(flags & VN_CREATE_NOLABEL)) {
+ error = vnode_label(vnode_mount(vp), dvp, vp, cnp, VNODE_LABEL_CREATE, ctx);
+ if (error)
+ goto error;
+ }
+#endif
+
/*
* If some of the requested attributes weren't handled by the VNOP,
* use our fallback code.
KAUTH_DEBUG(" CREATE - doing fallback with ACL %p", vap->va_acl);
error = vnode_setattr_fallback(*vpp, vap, ctx);
}
- if ((error != 0 ) && (vp != (vnode_t)0)) {
- *vpp = (vnode_t) 0;
- vnode_put(vp);
+#if CONFIG_MACF
+error:
+#endif
+ if ((error != 0) && (vp != (vnode_t)0)) {
+
+ /* If we've done a compound open, close */
+ if (batched && (old_error == 0) && (vap->va_type == VREG)) {
+ VNOP_CLOSE(vp, fmode, ctx);
+ }
+
+ /* Need to provide notifications if a create succeeded */
+ if (!batched) {
+ *vpp = (vnode_t) 0;
+ vnode_put(vp);
+ }
}
out:
- /*
- * If the caller supplied a filesec in vap, it has been replaced
- * now by the post-inheritance copy. We need to put the original back
- * and free the inherited product.
- */
- if (initial_acl) {
- VATTR_SET(vap, va_acl, oacl);
- } else {
- VATTR_CLEAR_ACTIVE(vap, va_acl);
- }
- if (nacl != NULL)
- kauth_acl_free(nacl);
+ vn_attribute_cleanup(vap, defaulted);
return(error);
}
static kauth_scope_t vnode_scope;
-static int vnode_authorize_callback(kauth_cred_t credential, __unused void *idata, kauth_action_t action,
+static int vnode_authorize_callback(kauth_cred_t credential, void *idata, kauth_action_t action,
uintptr_t arg0, uintptr_t arg1, uintptr_t arg2, uintptr_t arg3);
+static int vnode_authorize_callback_int(kauth_action_t action, vfs_context_t ctx,
+ vnode_t vp, vnode_t dvp, int *errorp);
typedef struct _vnode_authorize_context {
vnode_t vp;
#define _VAC_IN_GROUP (1<<1)
#define _VAC_IS_DIR_OWNER (1<<2)
#define _VAC_IN_DIR_GROUP (1<<3)
+#define _VAC_NO_VNODE_POINTERS (1<<4)
} *vauth_ctx;
void
vnode_scope = kauth_register_scope(KAUTH_SCOPE_VNODE, vnode_authorize_callback, NULL);
}
-/*
- * Authorize an operation on a vnode.
- *
- * This is KPI, but here because it needs vnode_scope.
- */
+#define VATTR_PREPARE_DEFAULTED_UID 0x1
+#define VATTR_PREPARE_DEFAULTED_GID 0x2
+#define VATTR_PREPARE_DEFAULTED_MODE 0x4
+
int
-vnode_authorize(vnode_t vp, vnode_t dvp, kauth_action_t action, vfs_context_t context)
+vn_attribute_prepare(vnode_t dvp, struct vnode_attr *vap, uint32_t *defaulted_fieldsp, vfs_context_t ctx)
{
- int error, result;
+ kauth_acl_t nacl = NULL, oacl = NULL;
+ int error;
/*
- * We can't authorize against a dead vnode; allow all operations through so that
- * the correct error can be returned.
+ * Handle ACL inheritance.
*/
- if (vp->v_type == VBAD)
- return(0);
+ if (!(vap->va_vaflags & VA_NOINHERIT) && vfs_extendedsecurity(dvp->v_mount)) {
+ /* save the original filesec */
+ if (VATTR_IS_ACTIVE(vap, va_acl)) {
+ oacl = vap->va_acl;
+ }
+
+ vap->va_acl = NULL;
+ if ((error = kauth_acl_inherit(dvp,
+ oacl,
+ &nacl,
+ vap->va_type == VDIR,
+ ctx)) != 0) {
+ KAUTH_DEBUG("%p CREATE - error %d processing inheritance", dvp, error);
+ return(error);
+ }
+
+ /*
+ * If the generated ACL is NULL, then we can save ourselves some effort
+ * by clearing the active bit.
+ */
+ if (nacl == NULL) {
+ VATTR_CLEAR_ACTIVE(vap, va_acl);
+ } else {
+ vap->va_base_acl = oacl;
+ VATTR_SET(vap, va_acl, nacl);
+ }
+ }
- error = 0;
- result = kauth_authorize_action(vnode_scope, vfs_context_ucred(context), action,
- (uintptr_t)context, (uintptr_t)vp, (uintptr_t)dvp, (uintptr_t)&error);
- if (result == EPERM) /* traditional behaviour */
- result = EACCES;
- /* did the lower layers give a better error return? */
- if ((result != 0) && (error != 0))
- return(error);
- return(result);
+ error = vnode_authattr_new_internal(dvp, vap, (vap->va_vaflags & VA_NOAUTH), defaulted_fieldsp, ctx);
+ if (error) {
+ vn_attribute_cleanup(vap, *defaulted_fieldsp);
+ }
+
+ return error;
}
-/*
- * Test for vnode immutability.
- *
- * The 'append' flag is set when the authorization request is constrained
- * to operations which only request the right to append to a file.
- *
- * The 'ignore' flag is set when an operation modifying the immutability flags
- * is being authorized. We check the system securelevel to determine which
- * immutability flags we can ignore.
- */
-static int
-vnode_immutable(struct vnode_attr *vap, int append, int ignore)
+void
+vn_attribute_cleanup(struct vnode_attr *vap, uint32_t defaulted_fields)
{
- int mask;
-
- /* start with all bits precluding the operation */
- mask = IMMUTABLE | APPEND;
+ /*
+ * If the caller supplied a filesec in vap, it has been replaced
+ * now by the post-inheritance copy. We need to put the original back
+ * and free the inherited product.
+ */
+ kauth_acl_t nacl, oacl;
- /* if appending only, remove the append-only bits */
- if (append)
- mask &= ~APPEND;
+ if (VATTR_IS_ACTIVE(vap, va_acl)) {
+ nacl = vap->va_acl;
+ oacl = vap->va_base_acl;
- /* ignore only set when authorizing flags changes */
- if (ignore) {
- if (securelevel <= 0) {
- /* in insecure state, flags do not inhibit changes */
- mask = 0;
+ if (oacl) {
+ VATTR_SET(vap, va_acl, oacl);
+ vap->va_base_acl = NULL;
} else {
- /* in secure state, user flags don't inhibit */
- mask &= ~(UF_IMMUTABLE | UF_APPEND);
+ VATTR_CLEAR_ACTIVE(vap, va_acl);
+ }
+
+ if (nacl != NULL) {
+ kauth_acl_free(nacl);
}
}
- KAUTH_DEBUG("IMMUTABLE - file flags 0x%x mask 0x%x append = %d ignore = %d", vap->va_flags, mask, append, ignore);
- if ((vap->va_flags & mask) != 0)
- return(EPERM);
- return(0);
+
+ if ((defaulted_fields & VATTR_PREPARE_DEFAULTED_MODE) != 0) {
+ VATTR_CLEAR_ACTIVE(vap, va_mode);
+ }
+ if ((defaulted_fields & VATTR_PREPARE_DEFAULTED_GID) != 0) {
+ VATTR_CLEAR_ACTIVE(vap, va_gid);
+ }
+ if ((defaulted_fields & VATTR_PREPARE_DEFAULTED_UID) != 0) {
+ VATTR_CLEAR_ACTIVE(vap, va_uid);
+ }
+
+ return;
}
-static int
-vauth_node_owner(struct vnode_attr *vap, kauth_cred_t cred)
+int
+vn_authorize_unlink(vnode_t dvp, vnode_t vp, struct componentname *cnp, vfs_context_t ctx, __unused void *reserved)
{
- int result;
-
- /* default assumption is not-owner */
- result = 0;
+#if !CONFIG_MACF
+#pragma unused(cnp)
+#endif
+ int error = 0;
/*
- * If the filesystem has given us a UID, we treat this as authoritative.
+ * Normally, unlinking of directories is not supported.
+ * However, some file systems may have limited support.
*/
- if (vap && VATTR_IS_SUPPORTED(vap, va_uid)) {
- result = (vap->va_uid == kauth_cred_getuid(cred)) ? 1 : 0;
+ if ((vp->v_type == VDIR) &&
+ !(vp->v_mount->mnt_kern_flag & MNTK_DIR_HARDLINKS)) {
+ return (EPERM); /* POSIX */
}
- /* we could test the owner UUID here if we had a policy for it */
-
- return(result);
+
+ /* authorize the delete operation */
+#if CONFIG_MACF
+ if (!error)
+ error = mac_vnode_check_unlink(ctx, dvp, vp, cnp);
+#endif /* MAC */
+ if (!error)
+ error = vnode_authorize(vp, dvp, KAUTH_VNODE_DELETE, ctx);
+
+ return error;
}
-static int
-vauth_node_group(struct vnode_attr *vap, kauth_cred_t cred, int *ismember)
+int
+vn_authorize_open_existing(vnode_t vp, struct componentname *cnp, int fmode, vfs_context_t ctx, void *reserved)
{
- int error;
- int result;
+ /* Open of existing case */
+ kauth_action_t action;
+ int error = 0;
+ if (cnp->cn_ndp == NULL) {
+ panic("NULL ndp");
+ }
+ if (reserved != NULL) {
+ panic("reserved not NULL.");
+ }
- error = 0;
- result = 0;
+#if CONFIG_MACF
+ /* XXX may do duplicate work here, but ignore that for now (idempotent) */
+ if (vfs_flags(vnode_mount(vp)) & MNT_MULTILABEL) {
+ error = vnode_label(vnode_mount(vp), NULL, vp, NULL, 0, ctx);
+ if (error)
+ return (error);
+ }
+#endif
- /* the caller is expected to have asked the filesystem for a group at some point */
- if (vap && VATTR_IS_SUPPORTED(vap, va_gid)) {
- error = kauth_cred_ismember_gid(cred, vap->va_gid, &result);
+ if ( (fmode & O_DIRECTORY) && vp->v_type != VDIR ) {
+ return (ENOTDIR);
}
- /* we could test the group UUID here if we had a policy for it */
- if (!error)
- *ismember = result;
- return(error);
-}
+ if (vp->v_type == VSOCK && vp->v_tag != VT_FDESC) {
+ return (EOPNOTSUPP); /* Operation not supported on socket */
+ }
-static int
-vauth_file_owner(vauth_ctx vcp)
-{
- int result;
+ if (vp->v_type == VLNK && (fmode & O_NOFOLLOW) != 0) {
+ return (ELOOP); /* O_NOFOLLOW was specified and the target is a symbolic link */
+ }
- if (vcp->flags_valid & _VAC_IS_OWNER) {
- result = (vcp->flags & _VAC_IS_OWNER) ? 1 : 0;
- } else {
- result = vauth_node_owner(vcp->vap, vcp->ctx->vc_ucred);
+ /* disallow write operations on directories */
+ if (vnode_isdir(vp) && (fmode & (FWRITE | O_TRUNC))) {
+ return (EISDIR);
+ }
- /* cache our result */
- vcp->flags_valid |= _VAC_IS_OWNER;
- if (result) {
- vcp->flags |= _VAC_IS_OWNER;
- } else {
- vcp->flags &= ~_VAC_IS_OWNER;
+ if ((cnp->cn_ndp->ni_flag & NAMEI_TRAILINGSLASH)) {
+ if (vp->v_type != VDIR) {
+ return (ENOTDIR);
}
}
- return(result);
-}
-
-static int
-vauth_file_ingroup(vauth_ctx vcp, int *ismember)
-{
- int error;
-
- if (vcp->flags_valid & _VAC_IN_GROUP) {
- *ismember = (vcp->flags & _VAC_IN_GROUP) ? 1 : 0;
- error = 0;
- } else {
- error = vauth_node_group(vcp->vap, vcp->ctx->vc_ucred, ismember);
- if (!error) {
- /* cache our result */
- vcp->flags_valid |= _VAC_IN_GROUP;
- if (*ismember) {
- vcp->flags |= _VAC_IN_GROUP;
- } else {
- vcp->flags &= ~_VAC_IN_GROUP;
- }
+#if CONFIG_MACF
+ /* If a file being opened is a shadow file containing
+ * namedstream data, ignore the macf checks because it
+ * is a kernel internal file and access should always
+ * be allowed.
+ */
+ if (!(vnode_isshadow(vp) && vnode_isnamedstream(vp))) {
+ error = mac_vnode_check_open(ctx, vp, fmode);
+ if (error) {
+ return (error);
}
-
}
- return(error);
-}
-
-static int
-vauth_dir_owner(vauth_ctx vcp)
-{
- int result;
-
- if (vcp->flags_valid & _VAC_IS_DIR_OWNER) {
- result = (vcp->flags & _VAC_IS_DIR_OWNER) ? 1 : 0;
- } else {
- result = vauth_node_owner(vcp->dvap, vcp->ctx->vc_ucred);
+#endif
- /* cache our result */
- vcp->flags_valid |= _VAC_IS_DIR_OWNER;
- if (result) {
- vcp->flags |= _VAC_IS_DIR_OWNER;
+ /* compute action to be authorized */
+ action = 0;
+ if (fmode & FREAD) {
+ action |= KAUTH_VNODE_READ_DATA;
+ }
+ if (fmode & (FWRITE | O_TRUNC)) {
+ /*
+ * If we are writing, appending, and not truncating,
+ * indicate that we are appending so that if the
+ * UF_APPEND or SF_APPEND bits are set, we do not deny
+ * the open.
+ */
+ if ((fmode & O_APPEND) && !(fmode & O_TRUNC)) {
+ action |= KAUTH_VNODE_APPEND_DATA;
} else {
- vcp->flags &= ~_VAC_IS_DIR_OWNER;
+ action |= KAUTH_VNODE_WRITE_DATA;
}
}
- return(result);
+ error = vnode_authorize(vp, NULL, action, ctx);
+#if NAMEDSTREAMS
+ if (error == EACCES) {
+ /*
+ * Shadow files may exist on-disk with a different UID/GID
+ * than that of the current context. Verify that this file
+ * is really a shadow file. If it was created successfully
+ * then it should be authorized.
+ */
+ if (vnode_isshadow(vp) && vnode_isnamedstream (vp)) {
+ error = vnode_verifynamedstream(vp);
+ }
+ }
+#endif
+
+ return error;
}
-static int
-vauth_dir_ingroup(vauth_ctx vcp, int *ismember)
+int
+vn_authorize_create(vnode_t dvp, struct componentname *cnp, struct vnode_attr *vap, vfs_context_t ctx, void *reserved)
{
- int error;
+#if !CONFIG_MACF
+#pragma unused(vap)
+#endif
+ /* Creation case */
+ int error;
- if (vcp->flags_valid & _VAC_IN_DIR_GROUP) {
- *ismember = (vcp->flags & _VAC_IN_DIR_GROUP) ? 1 : 0;
- error = 0;
- } else {
- error = vauth_node_group(vcp->dvap, vcp->ctx->vc_ucred, ismember);
+ if (cnp->cn_ndp == NULL) {
+ panic("NULL cn_ndp");
+ }
+ if (reserved != NULL) {
+ panic("reserved not NULL.");
+ }
- if (!error) {
- /* cache our result */
- vcp->flags_valid |= _VAC_IN_DIR_GROUP;
- if (*ismember) {
- vcp->flags |= _VAC_IN_DIR_GROUP;
- } else {
- vcp->flags &= ~_VAC_IN_DIR_GROUP;
- }
- }
+ /* Only validate path for creation if we didn't do a complete lookup */
+ if (cnp->cn_ndp->ni_flag & NAMEI_UNFINISHED) {
+ error = lookup_validate_creation_path(cnp->cn_ndp);
+ if (error)
+ return (error);
}
- return(error);
+
+#if CONFIG_MACF
+ error = mac_vnode_check_create(ctx, dvp, cnp, vap);
+ if (error)
+ return (error);
+#endif /* CONFIG_MACF */
+
+ return (vnode_authorize(dvp, NULL, KAUTH_VNODE_ADD_FILE, ctx));
}
-/*
- * Test the posix permissions in (vap) to determine whether (credential)
- * may perform (action)
- */
-static int
-vnode_authorize_posix(vauth_ctx vcp, int action, int on_dir)
+int
+vn_authorize_rename(struct vnode *fdvp, struct vnode *fvp, struct componentname *fcnp,
+ struct vnode *tdvp, struct vnode *tvp, struct componentname *tcnp,
+ vfs_context_t ctx, void *reserved)
{
- struct vnode_attr *vap;
- int needed, error, owner_ok, group_ok, world_ok, ismember;
-#ifdef KAUTH_DEBUG_ENABLE
- const char *where;
-# define _SETWHERE(c) where = c;
-#else
-# define _SETWHERE(c)
-#endif
+ return vn_authorize_renamex(fdvp, fvp, fcnp, tdvp, tvp, tcnp, ctx, 0, reserved);
+}
- /* checking file or directory? */
- if (on_dir) {
- vap = vcp->dvap;
- } else {
- vap = vcp->vap;
+int
+vn_authorize_renamex(struct vnode *fdvp, struct vnode *fvp, struct componentname *fcnp,
+ struct vnode *tdvp, struct vnode *tvp, struct componentname *tcnp,
+ vfs_context_t ctx, vfs_rename_flags_t flags, void *reserved)
+{
+ int error = 0;
+ int moving = 0;
+ bool swap = flags & VFS_RENAME_SWAP;
+
+ if (reserved != NULL) {
+ panic("Passed something other than NULL as reserved field!");
}
-
- error = 0;
-
+
/*
- * We want to do as little work here as possible. So first we check
- * which sets of permissions grant us the access we need, and avoid checking
- * whether specific permissions grant access when more generic ones would.
+ * Avoid renaming "." and "..".
+ *
+ * XXX No need to check for this in the FS. We should always have the leaves
+ * in VFS in this case.
*/
+ if (fvp->v_type == VDIR &&
+ ((fdvp == fvp) ||
+ (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
+ ((fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT)) ) {
+ error = EINVAL;
+ goto out;
+ }
- /* owner permissions */
- needed = 0;
- if (action & VREAD)
- needed |= S_IRUSR;
- if (action & VWRITE)
- needed |= S_IWUSR;
- if (action & VEXEC)
- needed |= S_IXUSR;
- owner_ok = (needed & vap->va_mode) == needed;
-
- /* group permissions */
- needed = 0;
- if (action & VREAD)
- needed |= S_IRGRP;
- if (action & VWRITE)
- needed |= S_IWGRP;
- if (action & VEXEC)
- needed |= S_IXGRP;
- group_ok = (needed & vap->va_mode) == needed;
-
- /* world permissions */
- needed = 0;
- if (action & VREAD)
- needed |= S_IROTH;
- if (action & VWRITE)
- needed |= S_IWOTH;
- if (action & VEXEC)
- needed |= S_IXOTH;
- world_ok = (needed & vap->va_mode) == needed;
+ if (tvp == NULLVP && vnode_compound_rename_available(tdvp)) {
+ error = lookup_validate_creation_path(tcnp->cn_ndp);
+ if (error)
+ goto out;
+ }
- /* If granted/denied by all three, we're done */
- if (owner_ok && group_ok && world_ok) {
- _SETWHERE("all");
+ /***** <MACF> *****/
+#if CONFIG_MACF
+ error = mac_vnode_check_rename(ctx, fdvp, fvp, fcnp, tdvp, tvp, tcnp);
+ if (error)
goto out;
+ if (swap) {
+ error = mac_vnode_check_rename(ctx, tdvp, tvp, tcnp, fdvp, fvp, fcnp);
+ if (error)
+ goto out;
}
- if (!owner_ok && !group_ok && !world_ok) {
- _SETWHERE("all");
- error = EACCES;
+#endif
+ /***** </MACF> *****/
+
+ /***** <MiscChecks> *****/
+ if (tvp != NULL) {
+ if (!swap) {
+ if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
+ error = ENOTDIR;
+ goto out;
+ } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
+ error = EISDIR;
+ goto out;
+ }
+ }
+ } else if (swap) {
+ /*
+ * Caller should have already checked this and returned
+ * ENOENT. If we send back ENOENT here, caller will retry
+ * which isn't what we want so we send back EINVAL here
+ * instead.
+ */
+ error = EINVAL;
goto out;
}
- /* Check ownership (relatively cheap) */
- if ((on_dir && vauth_dir_owner(vcp)) ||
- (!on_dir && vauth_file_owner(vcp))) {
- _SETWHERE("user");
- if (!owner_ok)
- error = EACCES;
+ if (fvp == tdvp) {
+ error = EINVAL;
goto out;
}
- /* Not owner; if group and world both grant it we're done */
- if (group_ok && world_ok) {
- _SETWHERE("group/world");
+ /*
+ * The following edge case is caught here:
+ * (to cannot be a descendent of from)
+ *
+ * o fdvp
+ * /
+ * /
+ * o fvp
+ * \
+ * \
+ * o tdvp
+ * /
+ * /
+ * o tvp
+ */
+ if (tdvp->v_parent == fvp) {
+ error = EINVAL;
goto out;
}
- if (!group_ok && !world_ok) {
- _SETWHERE("group/world");
- error = EACCES;
+
+ if (swap && fdvp->v_parent == tvp) {
+ error = EINVAL;
goto out;
}
+ /***** </MiscChecks> *****/
- /* Check group membership (most expensive) */
- ismember = 0;
- if (on_dir) {
- error = vauth_dir_ingroup(vcp, &ismember);
+ /***** <Kauth> *****/
+
+ if (swap) {
+ kauth_action_t f = 0, t = 0;
+
+ /*
+ * Directories changing parents need ...ADD_SUBDIR... to
+ * permit changing ".."
+ */
+ if (fdvp != tdvp) {
+ if (vnode_isdir(fvp))
+ f = KAUTH_VNODE_ADD_SUBDIRECTORY;
+ if (vnode_isdir(tvp))
+ t = KAUTH_VNODE_ADD_SUBDIRECTORY;
+ }
+ error = vnode_authorize(fvp, fdvp, KAUTH_VNODE_DELETE | f, ctx);
+ if (error)
+ goto out;
+ error = vnode_authorize(tvp, tdvp, KAUTH_VNODE_DELETE | t, ctx);
+ if (error)
+ goto out;
+ f = vnode_isdir(fvp) ? KAUTH_VNODE_ADD_SUBDIRECTORY : KAUTH_VNODE_ADD_FILE;
+ t = vnode_isdir(tvp) ? KAUTH_VNODE_ADD_SUBDIRECTORY : KAUTH_VNODE_ADD_FILE;
+ if (fdvp == tdvp)
+ error = vnode_authorize(fdvp, NULL, f | t, ctx);
+ else {
+ error = vnode_authorize(fdvp, NULL, t, ctx);
+ if (error)
+ goto out;
+ error = vnode_authorize(tdvp, NULL, f, ctx);
+ }
+ if (error)
+ goto out;
} else {
- error = vauth_file_ingroup(vcp, &ismember);
- }
- if (error)
- goto out;
- if (ismember) {
- _SETWHERE("group");
- if (!group_ok)
- error = EACCES;
- goto out;
- }
+ error = 0;
+ if ((tvp != NULL) && vnode_isdir(tvp)) {
+ if (tvp != fdvp)
+ moving = 1;
+ } else if (tdvp != fdvp) {
+ moving = 1;
+ }
- /* Not owner, not in group, use world result */
- _SETWHERE("world");
- if (!world_ok)
- error = EACCES;
+ /*
+ * must have delete rights to remove the old name even in
+ * the simple case of fdvp == tdvp.
+ *
+ * If fvp is a directory, and we are changing it's parent,
+ * then we also need rights to rewrite its ".." entry as well.
+ */
+ if (vnode_isdir(fvp)) {
+ if ((error = vnode_authorize(fvp, fdvp, KAUTH_VNODE_DELETE | KAUTH_VNODE_ADD_SUBDIRECTORY, ctx)) != 0)
+ goto out;
+ } else {
+ if ((error = vnode_authorize(fvp, fdvp, KAUTH_VNODE_DELETE, ctx)) != 0)
+ goto out;
+ }
+ if (moving) {
+ /* moving into tdvp or tvp, must have rights to add */
+ if ((error = vnode_authorize(((tvp != NULL) && vnode_isdir(tvp)) ? tvp : tdvp,
+ NULL,
+ vnode_isdir(fvp) ? KAUTH_VNODE_ADD_SUBDIRECTORY : KAUTH_VNODE_ADD_FILE,
+ ctx)) != 0) {
+ goto out;
+ }
+ } else {
+ /* node staying in same directory, must be allowed to add new name */
+ if ((error = vnode_authorize(fdvp, NULL,
+ vnode_isdir(fvp) ? KAUTH_VNODE_ADD_SUBDIRECTORY : KAUTH_VNODE_ADD_FILE, ctx)) != 0)
+ goto out;
+ }
+ /* overwriting tvp */
+ if ((tvp != NULL) && !vnode_isdir(tvp) &&
+ ((error = vnode_authorize(tvp, tdvp, KAUTH_VNODE_DELETE, ctx)) != 0)) {
+ goto out;
+ }
+ }
- /* FALLTHROUGH */
+ /***** </Kauth> *****/
+ /* XXX more checks? */
out:
- KAUTH_DEBUG("%p %s - posix %s permissions : need %s%s%s %x have %s%s%s%s%s%s%s%s%s UID = %d file = %d,%d",
- vcp->vp, (error == 0) ? "ALLOWED" : "DENIED", where,
- (action & VREAD) ? "r" : "-",
- (action & VWRITE) ? "w" : "-",
- (action & VEXEC) ? "x" : "-",
- needed,
- (vap->va_mode & S_IRUSR) ? "r" : "-",
- (vap->va_mode & S_IWUSR) ? "w" : "-",
- (vap->va_mode & S_IXUSR) ? "x" : "-",
- (vap->va_mode & S_IRGRP) ? "r" : "-",
- (vap->va_mode & S_IWGRP) ? "w" : "-",
- (vap->va_mode & S_IXGRP) ? "x" : "-",
- (vap->va_mode & S_IROTH) ? "r" : "-",
- (vap->va_mode & S_IWOTH) ? "w" : "-",
- (vap->va_mode & S_IXOTH) ? "x" : "-",
- kauth_cred_getuid(vcp->ctx->vc_ucred),
- on_dir ? vcp->dvap->va_uid : vcp->vap->va_uid,
- on_dir ? vcp->dvap->va_gid : vcp->vap->va_gid);
- return(error);
+ return error;
}
-/*
- * Authorize the deletion of the node vp from the directory dvp.
- *
- * We assume that:
- * - Neither the node nor the directory are immutable.
- * - The user is not the superuser.
- *
- * Deletion is not permitted if the directory is sticky and the caller is not owner of the
- * node or directory.
+int
+vn_authorize_mkdir(vnode_t dvp, struct componentname *cnp, struct vnode_attr *vap, vfs_context_t ctx, void *reserved)
+{
+#if !CONFIG_MACF
+#pragma unused(vap)
+#endif
+ int error;
+
+ if (reserved != NULL) {
+ panic("reserved not NULL in vn_authorize_mkdir()");
+ }
+
+ /* XXX A hack for now, to make shadow files work */
+ if (cnp->cn_ndp == NULL) {
+ return 0;
+ }
+
+ if (vnode_compound_mkdir_available(dvp)) {
+ error = lookup_validate_creation_path(cnp->cn_ndp);
+ if (error)
+ goto out;
+ }
+
+#if CONFIG_MACF
+ error = mac_vnode_check_create(ctx,
+ dvp, cnp, vap);
+ if (error)
+ goto out;
+#endif
+
+ /* authorize addition of a directory to the parent */
+ if ((error = vnode_authorize(dvp, NULL, KAUTH_VNODE_ADD_SUBDIRECTORY, ctx)) != 0)
+ goto out;
+
+out:
+ return error;
+}
+
+int
+vn_authorize_rmdir(vnode_t dvp, vnode_t vp, struct componentname *cnp, vfs_context_t ctx, void *reserved)
+{
+#if CONFIG_MACF
+ int error;
+#else
+#pragma unused(cnp)
+#endif
+ if (reserved != NULL) {
+ panic("Non-NULL reserved argument to vn_authorize_rmdir()");
+ }
+
+ if (vp->v_type != VDIR) {
+ /*
+ * rmdir only deals with directories
+ */
+ return ENOTDIR;
+ }
+
+ if (dvp == vp) {
+ /*
+ * No rmdir "." please.
+ */
+ return EINVAL;
+ }
+
+#if CONFIG_MACF
+ error = mac_vnode_check_unlink(ctx, dvp,
+ vp, cnp);
+ if (error)
+ return error;
+#endif
+
+ return vnode_authorize(vp, dvp, KAUTH_VNODE_DELETE, ctx);
+}
+
+/*
+ * Authorizer for directory cloning. This does not use vnodes but instead
+ * uses prefilled vnode attributes from the filesystem.
*
- * If either the node grants DELETE, or the directory grants DELETE_CHILD, the node may be
- * deleted. If neither denies the permission, and the caller has Posix write access to the
- * directory, then the node may be deleted.
+ * The same function is called to set up the attributes required, perform the
+ * authorization and cleanup (if required)
*/
-static int
-vnode_authorize_delete(vauth_ctx vcp)
+int
+vnode_attr_authorize_dir_clone(struct vnode_attr *vap, kauth_action_t action,
+ struct vnode_attr *dvap, __unused vnode_t sdvp, mount_t mp,
+ dir_clone_authorizer_op_t vattr_op, uint32_t flags, vfs_context_t ctx,
+ __unused void *reserved)
{
- struct vnode_attr *vap = vcp->vap;
- struct vnode_attr *dvap = vcp->dvap;
- kauth_cred_t cred = vcp->ctx->vc_ucred;
- struct kauth_acl_eval eval;
- int error, delete_denied, delete_child_denied, ismember;
-
- /* check the ACL on the directory */
- delete_child_denied = 0;
- if (VATTR_IS_NOT(dvap, va_acl, NULL)) {
- eval.ae_requested = KAUTH_VNODE_DELETE_CHILD;
- eval.ae_acl = &dvap->va_acl->acl_ace[0];
- eval.ae_count = dvap->va_acl->acl_entrycount;
- eval.ae_options = 0;
- if (vauth_dir_owner(vcp))
- eval.ae_options |= KAUTH_AEVAL_IS_OWNER;
- if ((error = vauth_dir_ingroup(vcp, &ismember)) != 0)
- return(error);
- if (ismember)
- eval.ae_options |= KAUTH_AEVAL_IN_GROUP;
- eval.ae_exp_gall = KAUTH_VNODE_GENERIC_ALL_BITS;
- eval.ae_exp_gread = KAUTH_VNODE_GENERIC_READ_BITS;
- eval.ae_exp_gwrite = KAUTH_VNODE_GENERIC_WRITE_BITS;
- eval.ae_exp_gexec = KAUTH_VNODE_GENERIC_EXECUTE_BITS;
+ int error;
+ int is_suser = vfs_context_issuser(ctx);
- error = kauth_acl_evaluate(cred, &eval);
+ if (vattr_op == OP_VATTR_SETUP) {
+ VATTR_INIT(vap);
- if (error != 0) {
- KAUTH_DEBUG("%p ERROR during ACL processing - %d", vcp->vp, error);
- return(error);
+ /*
+ * When ACL inheritence is implemented, both vap->va_acl and
+ * dvap->va_acl will be required (even as superuser).
+ */
+ VATTR_WANTED(vap, va_type);
+ VATTR_WANTED(vap, va_mode);
+ VATTR_WANTED(vap, va_flags);
+ VATTR_WANTED(vap, va_uid);
+ VATTR_WANTED(vap, va_gid);
+ if (dvap) {
+ VATTR_INIT(dvap);
+ VATTR_WANTED(dvap, va_flags);
}
- if (eval.ae_result == KAUTH_RESULT_DENY)
- delete_child_denied = 1;
- if (eval.ae_result == KAUTH_RESULT_ALLOW) {
- KAUTH_DEBUG("%p ALLOWED - granted by directory ACL", vcp->vp);
- return(0);
+
+ if (!is_suser) {
+ /*
+ * If not superuser, we have to evaluate ACLs and
+ * need the target directory gid to set the initial
+ * gid of the new object.
+ */
+ VATTR_WANTED(vap, va_acl);
+ if (dvap)
+ VATTR_WANTED(dvap, va_gid);
+ } else if (dvap && (flags & VNODE_CLONEFILE_NOOWNERCOPY)) {
+ VATTR_WANTED(dvap, va_gid);
}
+ return (0);
+ } else if (vattr_op == OP_VATTR_CLEANUP) {
+ return (0); /* Nothing to do for now */
}
- /* check the ACL on the node */
- delete_denied = 0;
- if (VATTR_IS_NOT(vap, va_acl, NULL)) {
- eval.ae_requested = KAUTH_VNODE_DELETE;
- eval.ae_acl = &vap->va_acl->acl_ace[0];
- eval.ae_count = vap->va_acl->acl_entrycount;
- eval.ae_options = 0;
- if (vauth_file_owner(vcp))
- eval.ae_options |= KAUTH_AEVAL_IS_OWNER;
- if ((error = vauth_file_ingroup(vcp, &ismember)) != 0)
- return(error);
- if (ismember)
- eval.ae_options |= KAUTH_AEVAL_IN_GROUP;
- eval.ae_exp_gall = KAUTH_VNODE_GENERIC_ALL_BITS;
- eval.ae_exp_gread = KAUTH_VNODE_GENERIC_READ_BITS;
- eval.ae_exp_gwrite = KAUTH_VNODE_GENERIC_WRITE_BITS;
- eval.ae_exp_gexec = KAUTH_VNODE_GENERIC_EXECUTE_BITS;
+ /* dvap isn't used for authorization */
+ error = vnode_attr_authorize(vap, NULL, mp, action, ctx);
- if ((error = kauth_acl_evaluate(cred, &eval)) != 0) {
- KAUTH_DEBUG("%p ERROR during ACL processing - %d", vcp->vp, error);
- return(error);
+ if (error)
+ return (error);
+
+ /*
+ * vn_attribute_prepare should be able to accept attributes as well as
+ * vnodes but for now we do this inline.
+ */
+ if (!is_suser || (flags & VNODE_CLONEFILE_NOOWNERCOPY)) {
+ /*
+ * If the filesystem is mounted IGNORE_OWNERSHIP and an explicit
+ * owner is set, that owner takes ownership of all new files.
+ */
+ if ((mp->mnt_flag & MNT_IGNORE_OWNERSHIP) &&
+ (mp->mnt_fsowner != KAUTH_UID_NONE)) {
+ VATTR_SET(vap, va_uid, mp->mnt_fsowner);
+ } else {
+ /* default owner is current user */
+ VATTR_SET(vap, va_uid,
+ kauth_cred_getuid(vfs_context_ucred(ctx)));
}
- if (eval.ae_result == KAUTH_RESULT_DENY)
- delete_denied = 1;
- if (eval.ae_result == KAUTH_RESULT_ALLOW) {
- KAUTH_DEBUG("%p ALLOWED - granted by file ACL", vcp->vp);
- return(0);
+
+ if ((mp->mnt_flag & MNT_IGNORE_OWNERSHIP) &&
+ (mp->mnt_fsgroup != KAUTH_GID_NONE)) {
+ VATTR_SET(vap, va_gid, mp->mnt_fsgroup);
+ } else {
+ /*
+ * default group comes from parent object,
+ * fallback to current user
+ */
+ if (VATTR_IS_SUPPORTED(dvap, va_gid)) {
+ VATTR_SET(vap, va_gid, dvap->va_gid);
+ } else {
+ VATTR_SET(vap, va_gid,
+ kauth_cred_getgid(vfs_context_ucred(ctx)));
+ }
}
}
- /* if denied by ACL on directory or node, return denial */
- if (delete_denied || delete_child_denied) {
- KAUTH_DEBUG("%p ALLOWED - denied by ACL", vcp->vp);
- return(EACCES);
+ /* Inherit SF_RESTRICTED bit from destination directory only */
+ if (VATTR_IS_ACTIVE(vap, va_flags)) {
+ VATTR_SET(vap, va_flags,
+ ((vap->va_flags & ~(UF_DATAVAULT | SF_RESTRICTED)))); /* Turn off from source */
+ if (VATTR_IS_ACTIVE(dvap, va_flags))
+ VATTR_SET(vap, va_flags,
+ vap->va_flags | (dvap->va_flags & (UF_DATAVAULT | SF_RESTRICTED)));
+ } else if (VATTR_IS_ACTIVE(dvap, va_flags)) {
+ VATTR_SET(vap, va_flags, (dvap->va_flags & (UF_DATAVAULT | SF_RESTRICTED)));
}
- /* enforce sticky bit behaviour */
- if ((dvap->va_mode & S_ISTXT) && !vauth_file_owner(vcp) && !vauth_dir_owner(vcp)) {
- KAUTH_DEBUG("%p DENIED - sticky bit rules (user %d file %d dir %d)",
- vcp->vp, cred->cr_uid, vap->va_uid, dvap->va_uid);
- return(EACCES);
- }
+ return (0);
+}
- /* check the directory */
- if ((error = vnode_authorize_posix(vcp, VWRITE, 1 /* on_dir */)) != 0) {
- KAUTH_DEBUG("%p ALLOWED - granted by posix permisssions", vcp->vp);
- return(error);
- }
- /* not denied, must be OK */
- return(0);
-}
+/*
+ * Authorize an operation on a vnode.
+ *
+ * This is KPI, but here because it needs vnode_scope.
+ *
+ * Returns: 0 Success
+ * kauth_authorize_action:EPERM ...
+ * xlate => EACCES Permission denied
+ * kauth_authorize_action:0 Success
+ * kauth_authorize_action: Depends on callback return; this is
+ * usually only vnode_authorize_callback(),
+ * but may include other listerners, if any
+ * exist.
+ * EROFS
+ * EACCES
+ * EPERM
+ * ???
+ */
+int
+vnode_authorize(vnode_t vp, vnode_t dvp, kauth_action_t action, vfs_context_t ctx)
+{
+ int error, result;
+
+ /*
+ * We can't authorize against a dead vnode; allow all operations through so that
+ * the correct error can be returned.
+ */
+ if (vp->v_type == VBAD)
+ return(0);
+ error = 0;
+ result = kauth_authorize_action(vnode_scope, vfs_context_ucred(ctx), action,
+ (uintptr_t)ctx, (uintptr_t)vp, (uintptr_t)dvp, (uintptr_t)&error);
+ if (result == EPERM) /* traditional behaviour */
+ result = EACCES;
+ /* did the lower layers give a better error return? */
+ if ((result != 0) && (error != 0))
+ return(error);
+ return(result);
+}
/*
- * Authorize an operation based on the node's attributes.
+ * Test for vnode immutability.
+ *
+ * The 'append' flag is set when the authorization request is constrained
+ * to operations which only request the right to append to a file.
+ *
+ * The 'ignore' flag is set when an operation modifying the immutability flags
+ * is being authorized. We check the system securelevel to determine which
+ * immutability flags we can ignore.
*/
static int
-vnode_authorize_simple(vauth_ctx vcp, kauth_ace_rights_t acl_rights, kauth_ace_rights_t preauth_rights)
+vnode_immutable(struct vnode_attr *vap, int append, int ignore)
{
- struct vnode_attr *vap = vcp->vap;
- kauth_cred_t cred = vcp->ctx->vc_ucred;
- struct kauth_acl_eval eval;
- int error, ismember;
- mode_t posix_action;
+ int mask;
- /*
- * If we are the file owner, we automatically have some rights.
- *
- * Do we need to expand this to support group ownership?
- */
- if (vauth_file_owner(vcp))
- acl_rights &= ~(KAUTH_VNODE_WRITE_SECURITY);
+ /* start with all bits precluding the operation */
+ mask = IMMUTABLE | APPEND;
- /*
- * If we are checking both TAKE_OWNERSHIP and WRITE_SECURITY, we can
- * mask the latter. If TAKE_OWNERSHIP is requested the caller is about to
- * change ownership to themselves, and WRITE_SECURITY is implicitly
- * granted to the owner. We need to do this because at this point
- * WRITE_SECURITY may not be granted as the caller is not currently
- * the owner.
- */
- if ((acl_rights & KAUTH_VNODE_TAKE_OWNERSHIP) &&
- (acl_rights & KAUTH_VNODE_WRITE_SECURITY))
- acl_rights &= ~KAUTH_VNODE_WRITE_SECURITY;
-
- if (acl_rights == 0) {
- KAUTH_DEBUG("%p ALLOWED - implicit or no rights required", vcp->vp);
- return(0);
- }
+ /* if appending only, remove the append-only bits */
+ if (append)
+ mask &= ~APPEND;
- /* if we have an ACL, evaluate it */
- if (VATTR_IS_NOT(vap, va_acl, NULL)) {
- eval.ae_requested = acl_rights;
- eval.ae_acl = &vap->va_acl->acl_ace[0];
- eval.ae_count = vap->va_acl->acl_entrycount;
- eval.ae_options = 0;
- if (vauth_file_owner(vcp))
- eval.ae_options |= KAUTH_AEVAL_IS_OWNER;
- if ((error = vauth_file_ingroup(vcp, &ismember)) != 0)
- return(error);
- if (ismember)
- eval.ae_options |= KAUTH_AEVAL_IN_GROUP;
- eval.ae_exp_gall = KAUTH_VNODE_GENERIC_ALL_BITS;
- eval.ae_exp_gread = KAUTH_VNODE_GENERIC_READ_BITS;
- eval.ae_exp_gwrite = KAUTH_VNODE_GENERIC_WRITE_BITS;
- eval.ae_exp_gexec = KAUTH_VNODE_GENERIC_EXECUTE_BITS;
-
- if ((error = kauth_acl_evaluate(cred, &eval)) != 0) {
- KAUTH_DEBUG("%p ERROR during ACL processing - %d", vcp->vp, error);
- return(error);
- }
-
- if (eval.ae_result == KAUTH_RESULT_DENY) {
- KAUTH_DEBUG("%p DENIED - by ACL", vcp->vp);
- return(EACCES); /* deny, deny, counter-allege */
- }
- if (eval.ae_result == KAUTH_RESULT_ALLOW) {
- KAUTH_DEBUG("%p ALLOWED - all rights granted by ACL", vcp->vp);
- return(0);
+ /* ignore only set when authorizing flags changes */
+ if (ignore) {
+ if (securelevel <= 0) {
+ /* in insecure state, flags do not inhibit changes */
+ mask = 0;
+ } else {
+ /* in secure state, user flags don't inhibit */
+ mask &= ~(UF_IMMUTABLE | UF_APPEND);
}
- /* fall through and evaluate residual rights */
- } else {
- /* no ACL, everything is residual */
- eval.ae_residual = acl_rights;
}
+ KAUTH_DEBUG("IMMUTABLE - file flags 0x%x mask 0x%x append = %d ignore = %d", vap->va_flags, mask, append, ignore);
+ if ((vap->va_flags & mask) != 0)
+ return(EPERM);
+ return(0);
+}
- /*
- * Grant residual rights that have been pre-authorized.
- */
- eval.ae_residual &= ~preauth_rights;
+static int
+vauth_node_owner(struct vnode_attr *vap, kauth_cred_t cred)
+{
+ int result;
+
+ /* default assumption is not-owner */
+ result = 0;
/*
- * We grant WRITE_ATTRIBUTES to the owner if it hasn't been denied.
+ * If the filesystem has given us a UID, we treat this as authoritative.
*/
- if (vauth_file_owner(vcp))
- eval.ae_residual &= ~KAUTH_VNODE_WRITE_ATTRIBUTES;
+ if (vap && VATTR_IS_SUPPORTED(vap, va_uid)) {
+ result = (vap->va_uid == kauth_cred_getuid(cred)) ? 1 : 0;
+ }
+ /* we could test the owner UUID here if we had a policy for it */
- if (eval.ae_residual == 0) {
- KAUTH_DEBUG("%p ALLOWED - rights already authorized", vcp->vp);
- return(0);
- }
-
- /*
- * Bail if we have residual rights that can't be granted by posix permissions,
- * or aren't presumed granted at this point.
- *
- * XXX these can be collapsed for performance
- */
- if (eval.ae_residual & KAUTH_VNODE_CHANGE_OWNER) {
- KAUTH_DEBUG("%p DENIED - CHANGE_OWNER not permitted", vcp->vp);
- return(EACCES);
- }
- if (eval.ae_residual & KAUTH_VNODE_WRITE_SECURITY) {
- KAUTH_DEBUG("%p DENIED - WRITE_SECURITY not permitted", vcp->vp);
- return(EACCES);
- }
-
-#if DIAGNOSTIC
- if (eval.ae_residual & KAUTH_VNODE_DELETE)
- panic("vnode_authorize: can't be checking delete permission here");
-#endif
-
- /*
- * Compute the fallback posix permissions that will satisfy the remaining
- * rights.
- */
- posix_action = 0;
- if (eval.ae_residual & (KAUTH_VNODE_READ_DATA |
- KAUTH_VNODE_LIST_DIRECTORY |
- KAUTH_VNODE_READ_EXTATTRIBUTES))
- posix_action |= VREAD;
- if (eval.ae_residual & (KAUTH_VNODE_WRITE_DATA |
- KAUTH_VNODE_ADD_FILE |
- KAUTH_VNODE_ADD_SUBDIRECTORY |
- KAUTH_VNODE_DELETE_CHILD |
- KAUTH_VNODE_WRITE_ATTRIBUTES |
- KAUTH_VNODE_WRITE_EXTATTRIBUTES))
- posix_action |= VWRITE;
- if (eval.ae_residual & (KAUTH_VNODE_EXECUTE |
- KAUTH_VNODE_SEARCH))
- posix_action |= VEXEC;
-
- if (posix_action != 0) {
- return(vnode_authorize_posix(vcp, posix_action, 0 /* !on_dir */));
- } else {
- KAUTH_DEBUG("%p ALLOWED - residual rights %s%s%s%s%s%s%s%s%s%s%s%s%s%s granted due to no posix mapping",
- vcp->vp,
- (eval.ae_residual & KAUTH_VNODE_READ_DATA)
- ? vnode_isdir(vcp->vp) ? " LIST_DIRECTORY" : " READ_DATA" : "",
- (eval.ae_residual & KAUTH_VNODE_WRITE_DATA)
- ? vnode_isdir(vcp->vp) ? " ADD_FILE" : " WRITE_DATA" : "",
- (eval.ae_residual & KAUTH_VNODE_EXECUTE)
- ? vnode_isdir(vcp->vp) ? " SEARCH" : " EXECUTE" : "",
- (eval.ae_residual & KAUTH_VNODE_DELETE)
- ? " DELETE" : "",
- (eval.ae_residual & KAUTH_VNODE_APPEND_DATA)
- ? vnode_isdir(vcp->vp) ? " ADD_SUBDIRECTORY" : " APPEND_DATA" : "",
- (eval.ae_residual & KAUTH_VNODE_DELETE_CHILD)
- ? " DELETE_CHILD" : "",
- (eval.ae_residual & KAUTH_VNODE_READ_ATTRIBUTES)
- ? " READ_ATTRIBUTES" : "",
- (eval.ae_residual & KAUTH_VNODE_WRITE_ATTRIBUTES)
- ? " WRITE_ATTRIBUTES" : "",
- (eval.ae_residual & KAUTH_VNODE_READ_EXTATTRIBUTES)
- ? " READ_EXTATTRIBUTES" : "",
- (eval.ae_residual & KAUTH_VNODE_WRITE_EXTATTRIBUTES)
- ? " WRITE_EXTATTRIBUTES" : "",
- (eval.ae_residual & KAUTH_VNODE_READ_SECURITY)
- ? " READ_SECURITY" : "",
- (eval.ae_residual & KAUTH_VNODE_WRITE_SECURITY)
- ? " WRITE_SECURITY" : "",
- (eval.ae_residual & KAUTH_VNODE_CHECKIMMUTABLE)
- ? " CHECKIMMUTABLE" : "",
- (eval.ae_residual & KAUTH_VNODE_CHANGE_OWNER)
- ? " CHANGE_OWNER" : "");
- }
-
- /*
- * Lack of required Posix permissions implies no reason to deny access.
- */
- return(0);
+ return(result);
}
/*
- * Check for file immutability.
+ * vauth_node_group
+ *
+ * Description: Ask if a cred is a member of the group owning the vnode object
+ *
+ * Parameters: vap vnode attribute
+ * vap->va_gid group owner of vnode object
+ * cred credential to check
+ * ismember pointer to where to put the answer
+ * idontknow Return this if we can't get an answer
+ *
+ * Returns: 0 Success
+ * idontknow Can't get information
+ * kauth_cred_ismember_gid:? Error from kauth subsystem
+ * kauth_cred_ismember_gid:? Error from kauth subsystem
*/
static int
-vnode_authorize_checkimmutable(vnode_t vp, struct vnode_attr *vap, int rights, int ignore)
+vauth_node_group(struct vnode_attr *vap, kauth_cred_t cred, int *ismember, int idontknow)
{
- mount_t mp;
- int error;
- int append;
+ int error;
+ int result;
+
+ error = 0;
+ result = 0;
/*
- * Perform immutability checks for operations that change data.
- *
- * Sockets, fifos and devices require special handling.
+ * The caller is expected to have asked the filesystem for a group
+ * at some point prior to calling this function. The answer may
+ * have been that there is no group ownership supported for the
+ * vnode object, in which case we return
*/
- switch(vp->v_type) {
- case VSOCK:
- case VFIFO:
- case VBLK:
- case VCHR:
+ if (vap && VATTR_IS_SUPPORTED(vap, va_gid)) {
+ error = kauth_cred_ismember_gid(cred, vap->va_gid, &result);
/*
- * Writing to these nodes does not change the filesystem data,
- * so forget that it's being tried.
+ * Credentials which are opted into external group membership
+ * resolution which are not known to the external resolver
+ * will result in an ENOENT error. We translate this into
+ * the appropriate 'idontknow' response for our caller.
+ *
+ * XXX We do not make a distinction here between an ENOENT
+ * XXX arising from a response from the external resolver,
+ * XXX and an ENOENT which is internally generated. This is
+ * XXX a deficiency of the published kauth_cred_ismember_gid()
+ * XXX KPI which can not be overcome without new KPI. For
+ * XXX all currently known cases, however, this wil result
+ * XXX in correct behaviour.
*/
- rights &= ~KAUTH_VNODE_WRITE_DATA;
- break;
- default:
- break;
+ if (error == ENOENT)
+ error = idontknow;
}
+ /*
+ * XXX We could test the group UUID here if we had a policy for it,
+ * XXX but this is problematic from the perspective of synchronizing
+ * XXX group UUID and POSIX GID ownership of a file and keeping the
+ * XXX values coherent over time. The problem is that the local
+ * XXX system will vend transient group UUIDs for unknown POSIX GID
+ * XXX values, and these are not persistent, whereas storage of values
+ * XXX is persistent. One potential solution to this is a local
+ * XXX (persistent) replica of remote directory entries and vended
+ * XXX local ids in a local directory server (think in terms of a
+ * XXX caching DNS server).
+ */
- error = 0;
- if (rights & KAUTH_VNODE_WRITE_RIGHTS) {
-
- /* check per-filesystem options if possible */
- mp = vnode_mount(vp);
- if (mp != NULL) {
-
- /* check for no-EA filesystems */
- if ((rights & KAUTH_VNODE_WRITE_EXTATTRIBUTES) &&
- (vfs_flags(mp) & MNT_NOUSERXATTR)) {
- KAUTH_DEBUG("%p DENIED - filesystem disallowed extended attributes", vp);
- error = EACCES; /* User attributes disabled */
- goto out;
- }
- }
+ if (!error)
+ *ismember = result;
+ return(error);
+}
- /* check for file immutability */
- append = 0;
- if (vp->v_type == VDIR) {
- if ((rights & (KAUTH_VNODE_ADD_FILE | KAUTH_VNODE_ADD_SUBDIRECTORY)) == rights)
- append = 1;
+static int
+vauth_file_owner(vauth_ctx vcp)
+{
+ int result;
+
+ if (vcp->flags_valid & _VAC_IS_OWNER) {
+ result = (vcp->flags & _VAC_IS_OWNER) ? 1 : 0;
+ } else {
+ result = vauth_node_owner(vcp->vap, vcp->ctx->vc_ucred);
+
+ /* cache our result */
+ vcp->flags_valid |= _VAC_IS_OWNER;
+ if (result) {
+ vcp->flags |= _VAC_IS_OWNER;
} else {
- if ((rights & KAUTH_VNODE_APPEND_DATA) == rights)
- append = 1;
- }
- if ((error = vnode_immutable(vap, append, ignore)) != 0) {
- KAUTH_DEBUG("%p DENIED - file is immutable", vp);
- goto out;
+ vcp->flags &= ~_VAC_IS_OWNER;
}
}
-out:
- return(error);
+ return(result);
}
+
/*
- * Handle authorization actions for filesystems that advertise that the server will
- * be enforcing.
+ * vauth_file_ingroup
+ *
+ * Description: Ask if a user is a member of the group owning the directory
+ *
+ * Parameters: vcp The vnode authorization context that
+ * contains the user and directory info
+ * vcp->flags_valid Valid flags
+ * vcp->flags Flags values
+ * vcp->vap File vnode attributes
+ * vcp->ctx VFS Context (for user)
+ * ismember pointer to where to put the answer
+ * idontknow Return this if we can't get an answer
+ *
+ * Returns: 0 Success
+ * vauth_node_group:? Error from vauth_node_group()
+ *
+ * Implicit returns: *ismember 0 The user is not a group member
+ * 1 The user is a group member
*/
static int
-vnode_authorize_opaque(vnode_t vp, int *resultp, kauth_action_t action, vfs_context_t ctx)
+vauth_file_ingroup(vauth_ctx vcp, int *ismember, int idontknow)
{
int error;
- /*
- * If the vp is a device node, socket or FIFO it actually represents a local
- * endpoint, so we need to handle it locally.
- */
- switch(vp->v_type) {
- case VBLK:
- case VCHR:
- case VSOCK:
- case VFIFO:
- return(0);
- default:
- break;
- }
-
- /*
- * In the advisory request case, if the filesystem doesn't think it's reliable
- * we will attempt to formulate a result ourselves based on VNOP_GETATTR data.
- */
- if ((action & KAUTH_VNODE_ACCESS) && !vfs_authopaqueaccess(vnode_mount(vp)))
- return(0);
+ /* Check for a cached answer first, to avoid the check if possible */
+ if (vcp->flags_valid & _VAC_IN_GROUP) {
+ *ismember = (vcp->flags & _VAC_IN_GROUP) ? 1 : 0;
+ error = 0;
+ } else {
+ /* Otherwise, go look for it */
+ error = vauth_node_group(vcp->vap, vcp->ctx->vc_ucred, ismember, idontknow);
- /*
- * Let the filesystem have a say in the matter. It's OK for it to not implemnent
- * VNOP_ACCESS, as most will authorise inline with the actual request.
- */
- if ((error = VNOP_ACCESS(vp, action, ctx)) != ENOTSUP) {
- *resultp = error;
- KAUTH_DEBUG("%p DENIED - opaque filesystem VNOP_ACCESS denied access", vp);
- return(1);
- }
-
- /*
- * Typically opaque filesystems do authorisation in-line, but exec is a special case. In
- * order to be reasonably sure that exec will be permitted, we try a bit harder here.
- */
- if ((action & KAUTH_VNODE_EXECUTE) && vnode_isreg(vp)) {
- /* try a VNOP_OPEN for readonly access */
- if ((error = VNOP_OPEN(vp, FREAD, ctx)) != 0) {
- *resultp = error;
- KAUTH_DEBUG("%p DENIED - EXECUTE denied because file could not be opened readonly", vp);
- return(1);
+ if (!error) {
+ /* cache our result */
+ vcp->flags_valid |= _VAC_IN_GROUP;
+ if (*ismember) {
+ vcp->flags |= _VAC_IN_GROUP;
+ } else {
+ vcp->flags &= ~_VAC_IN_GROUP;
+ }
}
- VNOP_CLOSE(vp, FREAD, ctx);
+
}
-
- /*
- * We don't have any reason to believe that the request has to be denied at this point,
- * so go ahead and allow it.
- */
- *resultp = 0;
- KAUTH_DEBUG("%p ALLOWED - bypassing access check for non-local filesystem", vp);
- return(1);
+ return(error);
}
static int
-vnode_authorize_callback(__unused kauth_cred_t unused_cred, __unused void *idata, kauth_action_t action,
- uintptr_t arg0, uintptr_t arg1, uintptr_t arg2, uintptr_t arg3)
+vauth_dir_owner(vauth_ctx vcp)
{
- struct _vnode_authorize_context auth_context;
- vauth_ctx vcp;
- vfs_context_t ctx;
- vnode_t vp, dvp;
- kauth_cred_t cred;
- kauth_ace_rights_t rights;
- struct vnode_attr va, dva;
- int result;
- int *errorp;
- int noimmutable;
-
- vcp = &auth_context;
- ctx = vcp->ctx = (vfs_context_t)arg0;
- vp = vcp->vp = (vnode_t)arg1;
- dvp = vcp->dvp = (vnode_t)arg2;
- errorp = (int *)arg3;
- /* note that we authorize against the context, not the passed cred (the same thing anyway) */
- cred = ctx->vc_ucred;
+ int result;
- VATTR_INIT(&va);
- vcp->vap = &va;
- VATTR_INIT(&dva);
- vcp->dvap = &dva;
+ if (vcp->flags_valid & _VAC_IS_DIR_OWNER) {
+ result = (vcp->flags & _VAC_IS_DIR_OWNER) ? 1 : 0;
+ } else {
+ result = vauth_node_owner(vcp->dvap, vcp->ctx->vc_ucred);
- vcp->flags = vcp->flags_valid = 0;
+ /* cache our result */
+ vcp->flags_valid |= _VAC_IS_DIR_OWNER;
+ if (result) {
+ vcp->flags |= _VAC_IS_DIR_OWNER;
+ } else {
+ vcp->flags &= ~_VAC_IS_DIR_OWNER;
+ }
+ }
+ return(result);
+}
-#if DIAGNOSTIC
- if ((ctx == NULL) || (vp == NULL) || (cred == NULL))
- panic("vnode_authorize: bad arguments (context %p vp %p cred %p)", ctx, vp, cred);
-#endif
+/*
+ * vauth_dir_ingroup
+ *
+ * Description: Ask if a user is a member of the group owning the directory
+ *
+ * Parameters: vcp The vnode authorization context that
+ * contains the user and directory info
+ * vcp->flags_valid Valid flags
+ * vcp->flags Flags values
+ * vcp->dvap Dir vnode attributes
+ * vcp->ctx VFS Context (for user)
+ * ismember pointer to where to put the answer
+ * idontknow Return this if we can't get an answer
+ *
+ * Returns: 0 Success
+ * vauth_node_group:? Error from vauth_node_group()
+ *
+ * Implicit returns: *ismember 0 The user is not a group member
+ * 1 The user is a group member
+ */
+static int
+vauth_dir_ingroup(vauth_ctx vcp, int *ismember, int idontknow)
+{
+ int error;
- KAUTH_DEBUG("%p AUTH - %s %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s on %s '%s' (0x%x:%p/%p)",
- vp, vfs_context_proc(ctx)->p_comm,
- (action & KAUTH_VNODE_ACCESS) ? "access" : "auth",
- (action & KAUTH_VNODE_READ_DATA) ? vnode_isdir(vp) ? " LIST_DIRECTORY" : " READ_DATA" : "",
- (action & KAUTH_VNODE_WRITE_DATA) ? vnode_isdir(vp) ? " ADD_FILE" : " WRITE_DATA" : "",
- (action & KAUTH_VNODE_EXECUTE) ? vnode_isdir(vp) ? " SEARCH" : " EXECUTE" : "",
- (action & KAUTH_VNODE_DELETE) ? " DELETE" : "",
- (action & KAUTH_VNODE_APPEND_DATA) ? vnode_isdir(vp) ? " ADD_SUBDIRECTORY" : " APPEND_DATA" : "",
- (action & KAUTH_VNODE_DELETE_CHILD) ? " DELETE_CHILD" : "",
- (action & KAUTH_VNODE_READ_ATTRIBUTES) ? " READ_ATTRIBUTES" : "",
- (action & KAUTH_VNODE_WRITE_ATTRIBUTES) ? " WRITE_ATTRIBUTES" : "",
- (action & KAUTH_VNODE_READ_EXTATTRIBUTES) ? " READ_EXTATTRIBUTES" : "",
- (action & KAUTH_VNODE_WRITE_EXTATTRIBUTES) ? " WRITE_EXTATTRIBUTES" : "",
- (action & KAUTH_VNODE_READ_SECURITY) ? " READ_SECURITY" : "",
- (action & KAUTH_VNODE_WRITE_SECURITY) ? " WRITE_SECURITY" : "",
- (action & KAUTH_VNODE_CHANGE_OWNER) ? " CHANGE_OWNER" : "",
- (action & KAUTH_VNODE_NOIMMUTABLE) ? " (noimmutable)" : "",
- vnode_isdir(vp) ? "directory" : "file",
- vp->v_name ? vp->v_name : "<NULL>", action, vp, dvp);
+ /* Check for a cached answer first, to avoid the check if possible */
+ if (vcp->flags_valid & _VAC_IN_DIR_GROUP) {
+ *ismember = (vcp->flags & _VAC_IN_DIR_GROUP) ? 1 : 0;
+ error = 0;
+ } else {
+ /* Otherwise, go look for it */
+ error = vauth_node_group(vcp->dvap, vcp->ctx->vc_ucred, ismember, idontknow);
- /*
- * Extract the control bits from the action, everything else is
- * requested rights.
- */
- noimmutable = (action & KAUTH_VNODE_NOIMMUTABLE) ? 1 : 0;
- rights = action & ~(KAUTH_VNODE_ACCESS | KAUTH_VNODE_NOIMMUTABLE);
-
- if (rights & KAUTH_VNODE_DELETE) {
-#if DIAGNOSTIC
- if (dvp == NULL)
- panic("vnode_authorize: KAUTH_VNODE_DELETE test requires a directory");
+ if (!error) {
+ /* cache our result */
+ vcp->flags_valid |= _VAC_IN_DIR_GROUP;
+ if (*ismember) {
+ vcp->flags |= _VAC_IN_DIR_GROUP;
+ } else {
+ vcp->flags &= ~_VAC_IN_DIR_GROUP;
+ }
+ }
+ }
+ return(error);
+}
+
+/*
+ * Test the posix permissions in (vap) to determine whether (credential)
+ * may perform (action)
+ */
+static int
+vnode_authorize_posix(vauth_ctx vcp, int action, int on_dir)
+{
+ struct vnode_attr *vap;
+ int needed, error, owner_ok, group_ok, world_ok, ismember;
+#ifdef KAUTH_DEBUG_ENABLE
+ const char *where = "uninitialized";
+# define _SETWHERE(c) where = c;
+#else
+# define _SETWHERE(c)
#endif
+
+ /* checking file or directory? */
+ if (on_dir) {
+ vap = vcp->dvap;
} else {
- dvp = NULL;
+ vap = vcp->vap;
}
+ error = 0;
+
/*
- * Check for read-only filesystems.
+ * We want to do as little work here as possible. So first we check
+ * which sets of permissions grant us the access we need, and avoid checking
+ * whether specific permissions grant access when more generic ones would.
*/
- if ((rights & KAUTH_VNODE_WRITE_RIGHTS) &&
- (vp->v_mount->mnt_flag & MNT_RDONLY) &&
- ((vp->v_type == VREG) || (vp->v_type == VDIR) ||
- (vp->v_type == VLNK) || (vp->v_type == VCPLX) ||
- (rights & KAUTH_VNODE_DELETE) || (rights & KAUTH_VNODE_DELETE_CHILD))) {
- result = EROFS;
- goto out;
- }
- /*
- * Check for noexec filesystems.
- */
- if ((rights & KAUTH_VNODE_EXECUTE) && vnode_isreg(vp) && (vp->v_mount->mnt_flag & MNT_NOEXEC)) {
- result = EACCES;
- goto out;
- }
+ /* owner permissions */
+ needed = 0;
+ if (action & VREAD)
+ needed |= S_IRUSR;
+ if (action & VWRITE)
+ needed |= S_IWUSR;
+ if (action & VEXEC)
+ needed |= S_IXUSR;
+ owner_ok = (needed & vap->va_mode) == needed;
- /*
- * Handle cases related to filesystems with non-local enforcement.
- * This call can return 0, in which case we will fall through to perform a
- * check based on VNOP_GETATTR data. Otherwise it returns 1 and sets
- * an appropriate result, at which point we can return immediately.
- */
- if (vfs_authopaque(vp->v_mount) && vnode_authorize_opaque(vp, &result, action, ctx))
- goto out;
+ /* group permissions */
+ needed = 0;
+ if (action & VREAD)
+ needed |= S_IRGRP;
+ if (action & VWRITE)
+ needed |= S_IWGRP;
+ if (action & VEXEC)
+ needed |= S_IXGRP;
+ group_ok = (needed & vap->va_mode) == needed;
- /*
- * Get vnode attributes and extended security information for the vnode
- * and directory if required.
- */
- VATTR_WANTED(&va, va_mode);
- VATTR_WANTED(&va, va_uid);
- VATTR_WANTED(&va, va_gid);
- VATTR_WANTED(&va, va_flags);
- VATTR_WANTED(&va, va_acl);
- if ((result = vnode_getattr(vp, &va, ctx)) != 0) {
- KAUTH_DEBUG("%p ERROR - failed to get vnode attributes - %d", vp, result);
+ /* world permissions */
+ needed = 0;
+ if (action & VREAD)
+ needed |= S_IROTH;
+ if (action & VWRITE)
+ needed |= S_IWOTH;
+ if (action & VEXEC)
+ needed |= S_IXOTH;
+ world_ok = (needed & vap->va_mode) == needed;
+
+ /* If granted/denied by all three, we're done */
+ if (owner_ok && group_ok && world_ok) {
+ _SETWHERE("all");
goto out;
}
- if (dvp) {
- VATTR_WANTED(&dva, va_mode);
- VATTR_WANTED(&dva, va_uid);
- VATTR_WANTED(&dva, va_gid);
- VATTR_WANTED(&dva, va_flags);
- VATTR_WANTED(&dva, va_acl);
- if ((result = vnode_getattr(dvp, &dva, ctx)) != 0) {
- KAUTH_DEBUG("%p ERROR - failed to get directory vnode attributes - %d", vp, result);
- goto out;
- }
+ if (!owner_ok && !group_ok && !world_ok) {
+ _SETWHERE("all");
+ error = EACCES;
+ goto out;
}
- /*
- * If the vnode is an extended attribute data vnode (eg. a resource fork), *_DATA becomes
- * *_EXTATTRIBUTES.
- */
- if (S_ISXATTR(va.va_mode)) {
- if (rights & KAUTH_VNODE_READ_DATA) {
- rights &= ~KAUTH_VNODE_READ_DATA;
- rights |= KAUTH_VNODE_READ_EXTATTRIBUTES;
- }
- if (rights & KAUTH_VNODE_WRITE_DATA) {
- rights &= ~KAUTH_VNODE_WRITE_DATA;
- rights |= KAUTH_VNODE_WRITE_EXTATTRIBUTES;
- }
+ /* Check ownership (relatively cheap) */
+ if ((on_dir && vauth_dir_owner(vcp)) ||
+ (!on_dir && vauth_file_owner(vcp))) {
+ _SETWHERE("user");
+ if (!owner_ok)
+ error = EACCES;
+ goto out;
}
-
- /*
- * Check for immutability.
- *
- * In the deletion case, parent directory immutability vetoes specific
- * file rights.
- */
- if ((result = vnode_authorize_checkimmutable(vp, &va, rights, noimmutable)) != 0)
+
+ /* Not owner; if group and world both grant it we're done */
+ if (group_ok && world_ok) {
+ _SETWHERE("group/world");
goto out;
- if ((rights & KAUTH_VNODE_DELETE) &&
- ((result = vnode_authorize_checkimmutable(dvp, &dva, KAUTH_VNODE_DELETE_CHILD, 0)) != 0))
+ }
+ if (!group_ok && !world_ok) {
+ _SETWHERE("group/world");
+ error = EACCES;
goto out;
+ }
- /*
- * Clear rights that have been authorized by reaching this point, bail if nothing left to
- * check.
- */
- rights &= ~(KAUTH_VNODE_LINKTARGET | KAUTH_VNODE_CHECKIMMUTABLE);
- if (rights == 0)
- goto out;
+ /* Check group membership (most expensive) */
+ ismember = 0; /* Default to allow, if the target has no group owner */
/*
- * If we're not the superuser, authorize based on file properties.
+ * In the case we can't get an answer about the user from the call to
+ * vauth_dir_ingroup() or vauth_file_ingroup(), we want to fail on
+ * the side of caution, rather than simply granting access, or we will
+ * fail to correctly implement exclusion groups, so we set the third
+ * parameter on the basis of the state of 'group_ok'.
*/
- if (!vfs_context_issuser(ctx)) {
- /* process delete rights */
- if ((rights & KAUTH_VNODE_DELETE) &&
- ((result = vnode_authorize_delete(vcp)) != 0))
- goto out;
-
- /* process remaining rights */
- if ((rights & ~KAUTH_VNODE_DELETE) &&
- ((result = vnode_authorize_simple(vcp, rights, rights & KAUTH_VNODE_DELETE)) != 0))
- goto out;
+ if (on_dir) {
+ error = vauth_dir_ingroup(vcp, &ismember, (!group_ok ? EACCES : 0));
} else {
-
- /*
- * Execute is only granted to root if one of the x bits is set. This check only
- * makes sense if the posix mode bits are actually supported.
- */
- if ((rights & KAUTH_VNODE_EXECUTE) &&
- (vp->v_type == VREG) &&
- VATTR_IS_SUPPORTED(&va, va_mode) &&
- !(va.va_mode & (S_IXUSR | S_IXGRP | S_IXOTH))) {
- result = EPERM;
- KAUTH_DEBUG("%p DENIED - root execute requires at least one x bit in 0x%x", vp, va.va_mode);
- goto out;
- }
-
- KAUTH_DEBUG("%p ALLOWED - caller is superuser", vp);
+ error = vauth_file_ingroup(vcp, &ismember, (!group_ok ? EACCES : 0));
}
-
-out:
- if (VATTR_IS_SUPPORTED(&va, va_acl) && (va.va_acl != NULL))
- kauth_acl_free(va.va_acl);
- if (VATTR_IS_SUPPORTED(&dva, va_acl) && (dva.va_acl != NULL))
- kauth_acl_free(dva.va_acl);
- if (result) {
- *errorp = result;
- KAUTH_DEBUG("%p DENIED - auth denied", vp);
- return(KAUTH_RESULT_DENY);
+ if (error) {
+ if (!group_ok)
+ ismember = 1;
+ error = 0;
+ }
+ if (ismember) {
+ _SETWHERE("group");
+ if (!group_ok)
+ error = EACCES;
+ goto out;
}
- /*
- * Note that this implies that we will allow requests for no rights, as well as
- * for rights that we do not recognise. There should be none of these.
- */
- KAUTH_DEBUG("%p ALLOWED - auth granted", vp);
- return(KAUTH_RESULT_ALLOW);
-}
+ /* Not owner, not in group, use world result */
+ _SETWHERE("world");
+ if (!world_ok)
+ error = EACCES;
-/*
- * Check that the attribute information in vattr can be legally applied to
- * a new file by the context.
- */
-int
-vnode_authattr_new(vnode_t dvp, struct vnode_attr *vap, int noauth, vfs_context_t ctx)
-{
- int error;
- int is_suser, ismember, defaulted_owner, defaulted_group, defaulted_mode;
- kauth_cred_t cred;
- guid_t changer;
- mount_t dmp;
+ /* FALLTHROUGH */
- error = 0;
- defaulted_owner = defaulted_group = defaulted_mode = 0;
+out:
+ KAUTH_DEBUG("%p %s - posix %s permissions : need %s%s%s %x have %s%s%s%s%s%s%s%s%s UID = %d file = %d,%d",
+ vcp->vp, (error == 0) ? "ALLOWED" : "DENIED", where,
+ (action & VREAD) ? "r" : "-",
+ (action & VWRITE) ? "w" : "-",
+ (action & VEXEC) ? "x" : "-",
+ needed,
+ (vap->va_mode & S_IRUSR) ? "r" : "-",
+ (vap->va_mode & S_IWUSR) ? "w" : "-",
+ (vap->va_mode & S_IXUSR) ? "x" : "-",
+ (vap->va_mode & S_IRGRP) ? "r" : "-",
+ (vap->va_mode & S_IWGRP) ? "w" : "-",
+ (vap->va_mode & S_IXGRP) ? "x" : "-",
+ (vap->va_mode & S_IROTH) ? "r" : "-",
+ (vap->va_mode & S_IWOTH) ? "w" : "-",
+ (vap->va_mode & S_IXOTH) ? "x" : "-",
+ kauth_cred_getuid(vcp->ctx->vc_ucred),
+ on_dir ? vcp->dvap->va_uid : vcp->vap->va_uid,
+ on_dir ? vcp->dvap->va_gid : vcp->vap->va_gid);
+ return(error);
+}
- /*
- * Require that the filesystem support extended security to apply any.
- */
- if (!vfs_extendedsecurity(dvp->v_mount) &&
- (VATTR_IS_ACTIVE(vap, va_acl) || VATTR_IS_ACTIVE(vap, va_uuuid) || VATTR_IS_ACTIVE(vap, va_guuid))) {
- error = EINVAL;
- goto out;
+/*
+ * Authorize the deletion of the node vp from the directory dvp.
+ *
+ * We assume that:
+ * - Neither the node nor the directory are immutable.
+ * - The user is not the superuser.
+ *
+ * The precedence of factors for authorizing or denying delete for a credential
+ *
+ * 1) Explicit ACE on the node. (allow or deny DELETE)
+ * 2) Explicit ACE on the directory (allow or deny DELETE_CHILD).
+ *
+ * If there are conflicting ACEs on the node and the directory, the node
+ * ACE wins.
+ *
+ * 3) Sticky bit on the directory.
+ * Deletion is not permitted if the directory is sticky and the caller is
+ * not owner of the node or directory. The sticky bit rules are like a deny
+ * delete ACE except lower in priority than ACL's either allowing or denying
+ * delete.
+ *
+ * 4) POSIX permisions on the directory.
+ *
+ * As an optimization, we cache whether or not delete child is permitted
+ * on directories. This enables us to skip directory ACL and POSIX checks
+ * as we already have the result from those checks. However, we always check the
+ * node ACL and, if the directory has the sticky bit set, we always check its
+ * ACL (even for a directory with an authorized delete child). Furthermore,
+ * caching the delete child authorization is independent of the sticky bit
+ * being set as it is only applicable in determining whether the node can be
+ * deleted or not.
+ */
+static int
+vnode_authorize_delete(vauth_ctx vcp, boolean_t cached_delete_child)
+{
+ struct vnode_attr *vap = vcp->vap;
+ struct vnode_attr *dvap = vcp->dvap;
+ kauth_cred_t cred = vcp->ctx->vc_ucred;
+ struct kauth_acl_eval eval;
+ int error, ismember;
+
+ /* Check the ACL on the node first */
+ if (VATTR_IS_NOT(vap, va_acl, NULL)) {
+ eval.ae_requested = KAUTH_VNODE_DELETE;
+ eval.ae_acl = &vap->va_acl->acl_ace[0];
+ eval.ae_count = vap->va_acl->acl_entrycount;
+ eval.ae_options = 0;
+ if (vauth_file_owner(vcp))
+ eval.ae_options |= KAUTH_AEVAL_IS_OWNER;
+ /*
+ * We use ENOENT as a marker to indicate we could not get
+ * information in order to delay evaluation until after we
+ * have the ACL evaluation answer. Previously, we would
+ * always deny the operation at this point.
+ */
+ if ((error = vauth_file_ingroup(vcp, &ismember, ENOENT)) != 0 && error != ENOENT)
+ return (error);
+ if (error == ENOENT)
+ eval.ae_options |= KAUTH_AEVAL_IN_GROUP_UNKNOWN;
+ else if (ismember)
+ eval.ae_options |= KAUTH_AEVAL_IN_GROUP;
+ eval.ae_exp_gall = KAUTH_VNODE_GENERIC_ALL_BITS;
+ eval.ae_exp_gread = KAUTH_VNODE_GENERIC_READ_BITS;
+ eval.ae_exp_gwrite = KAUTH_VNODE_GENERIC_WRITE_BITS;
+ eval.ae_exp_gexec = KAUTH_VNODE_GENERIC_EXECUTE_BITS;
+
+ if ((error = kauth_acl_evaluate(cred, &eval)) != 0) {
+ KAUTH_DEBUG("%p ERROR during ACL processing - %d", vcp->vp, error);
+ return (error);
+ }
+
+ switch(eval.ae_result) {
+ case KAUTH_RESULT_DENY:
+ KAUTH_DEBUG("%p DENIED - denied by ACL", vcp->vp);
+ return (EACCES);
+ case KAUTH_RESULT_ALLOW:
+ KAUTH_DEBUG("%p ALLOWED - granted by ACL", vcp->vp);
+ return (0);
+ case KAUTH_RESULT_DEFER:
+ default:
+ /* Defer to directory */
+ KAUTH_DEBUG("%p DEFERRED - by file ACL", vcp->vp);
+ break;
+ }
}
-
- /*
- * Default some fields.
- */
- dmp = dvp->v_mount;
/*
- * If the filesystem is mounted IGNORE_OWNERSHIP and an explicit owner is set, that
- * owner takes ownership of all new files.
+ * Without a sticky bit, a previously authorized delete child is
+ * sufficient to authorize this delete.
+ *
+ * If the sticky bit is set, a directory ACL which allows delete child
+ * overrides a (potential) sticky bit deny. The authorized delete child
+ * cannot tell us if it was authorized because of an explicit delete
+ * child allow ACE or because of POSIX permisions so we have to check
+ * the directory ACL everytime if the directory has a sticky bit.
*/
- if ((dmp->mnt_flag & MNT_IGNORE_OWNERSHIP) && (dmp->mnt_fsowner != KAUTH_UID_NONE)) {
- VATTR_SET(vap, va_uid, dmp->mnt_fsowner);
- defaulted_owner = 1;
- } else {
- if (!VATTR_IS_ACTIVE(vap, va_uid)) {
- /* default owner is current user */
- VATTR_SET(vap, va_uid, kauth_cred_getuid(vfs_context_ucred(ctx)));
- defaulted_owner = 1;
+ if (!(dvap->va_mode & S_ISTXT) && cached_delete_child) {
+ KAUTH_DEBUG("%p ALLOWED - granted by directory ACL or POSIX permissions and no sticky bit on directory", vcp->vp);
+ return (0);
+ }
+
+ /* check the ACL on the directory */
+ if (VATTR_IS_NOT(dvap, va_acl, NULL)) {
+ eval.ae_requested = KAUTH_VNODE_DELETE_CHILD;
+ eval.ae_acl = &dvap->va_acl->acl_ace[0];
+ eval.ae_count = dvap->va_acl->acl_entrycount;
+ eval.ae_options = 0;
+ if (vauth_dir_owner(vcp))
+ eval.ae_options |= KAUTH_AEVAL_IS_OWNER;
+ /*
+ * We use ENOENT as a marker to indicate we could not get
+ * information in order to delay evaluation until after we
+ * have the ACL evaluation answer. Previously, we would
+ * always deny the operation at this point.
+ */
+ if ((error = vauth_dir_ingroup(vcp, &ismember, ENOENT)) != 0 && error != ENOENT)
+ return(error);
+ if (error == ENOENT)
+ eval.ae_options |= KAUTH_AEVAL_IN_GROUP_UNKNOWN;
+ else if (ismember)
+ eval.ae_options |= KAUTH_AEVAL_IN_GROUP;
+ eval.ae_exp_gall = KAUTH_VNODE_GENERIC_ALL_BITS;
+ eval.ae_exp_gread = KAUTH_VNODE_GENERIC_READ_BITS;
+ eval.ae_exp_gwrite = KAUTH_VNODE_GENERIC_WRITE_BITS;
+ eval.ae_exp_gexec = KAUTH_VNODE_GENERIC_EXECUTE_BITS;
+
+ /*
+ * If there is no entry, we are going to defer to other
+ * authorization mechanisms.
+ */
+ error = kauth_acl_evaluate(cred, &eval);
+
+ if (error != 0) {
+ KAUTH_DEBUG("%p ERROR during ACL processing - %d", vcp->vp, error);
+ return (error);
+ }
+ switch(eval.ae_result) {
+ case KAUTH_RESULT_DENY:
+ KAUTH_DEBUG("%p DENIED - denied by directory ACL", vcp->vp);
+ return (EACCES);
+ case KAUTH_RESULT_ALLOW:
+ KAUTH_DEBUG("%p ALLOWED - granted by directory ACL", vcp->vp);
+ if (!cached_delete_child && vcp->dvp) {
+ vnode_cache_authorized_action(vcp->dvp,
+ vcp->ctx, KAUTH_VNODE_DELETE_CHILD);
+ }
+ return (0);
+ case KAUTH_RESULT_DEFER:
+ default:
+ /* Deferred by directory ACL */
+ KAUTH_DEBUG("%p DEFERRED - directory ACL", vcp->vp);
+ break;
}
}
/*
- * If the filesystem is mounted IGNORE_OWNERSHIP and an explicit grouo is set, that
- * group takes ownership of all new files.
+ * From this point, we can't explicitly allow and if we reach the end
+ * of the function without a denial, then the delete is authorized.
*/
- if ((dmp->mnt_flag & MNT_IGNORE_OWNERSHIP) && (dmp->mnt_fsgroup != KAUTH_GID_NONE)) {
- VATTR_SET(vap, va_gid, dmp->mnt_fsgroup);
- defaulted_group = 1;
- } else {
- if (!VATTR_IS_ACTIVE(vap, va_gid)) {
- /* default group comes from parent object, fallback to current user */
- struct vnode_attr dva;
- VATTR_INIT(&dva);
- VATTR_WANTED(&dva, va_gid);
- if ((error = vnode_getattr(dvp, &dva, ctx)) != 0)
- goto out;
- if (VATTR_IS_SUPPORTED(&dva, va_gid)) {
- VATTR_SET(vap, va_gid, dva.va_gid);
- } else {
- VATTR_SET(vap, va_gid, kauth_cred_getgid(vfs_context_ucred(ctx)));
- }
- defaulted_group = 1;
+ if (!cached_delete_child) {
+ if (vnode_authorize_posix(vcp, VWRITE, 1 /* on_dir */) != 0) {
+ KAUTH_DEBUG("%p DENIED - denied by posix permisssions", vcp->vp);
+ return (EACCES);
+ }
+ /*
+ * Cache the authorized action on the vnode if allowed by the
+ * directory ACL or POSIX permissions. It is correct to cache
+ * this action even if sticky bit would deny deleting the node.
+ */
+ if (vcp->dvp) {
+ vnode_cache_authorized_action(vcp->dvp, vcp->ctx,
+ KAUTH_VNODE_DELETE_CHILD);
}
}
- if (!VATTR_IS_ACTIVE(vap, va_flags))
- VATTR_SET(vap, va_flags, 0);
-
- /* default mode is everything, masked with current umask */
- if (!VATTR_IS_ACTIVE(vap, va_mode)) {
- VATTR_SET(vap, va_mode, ACCESSPERMS & ~vfs_context_proc(ctx)->p_fd->fd_cmask);
- KAUTH_DEBUG("ATTR - defaulting new file mode to %o from umask %o", vap->va_mode, vfs_context_proc(ctx)->p_fd->fd_cmask);
- defaulted_mode = 1;
- }
- /* set timestamps to now */
- if (!VATTR_IS_ACTIVE(vap, va_create_time)) {
- nanotime(&vap->va_create_time);
- VATTR_SET_ACTIVE(vap, va_create_time);
+ /* enforce sticky bit behaviour */
+ if ((dvap->va_mode & S_ISTXT) && !vauth_file_owner(vcp) && !vauth_dir_owner(vcp)) {
+ KAUTH_DEBUG("%p DENIED - sticky bit rules (user %d file %d dir %d)",
+ vcp->vp, cred->cr_posix.cr_uid, vap->va_uid, dvap->va_uid);
+ return (EACCES);
}
+
+ /* not denied, must be OK */
+ return (0);
+}
- /*
- * Check for attempts to set nonsensical fields.
- */
- if (vap->va_active & ~VNODE_ATTR_NEWOBJ) {
- error = EINVAL;
- KAUTH_DEBUG("ATTR - ERROR - attempt to set unsupported new-file attributes %llx",
- vap->va_active & ~VNODE_ATTR_NEWOBJ);
- goto out;
- }
+
+/*
+ * Authorize an operation based on the node's attributes.
+ */
+static int
+vnode_authorize_simple(vauth_ctx vcp, kauth_ace_rights_t acl_rights, kauth_ace_rights_t preauth_rights, boolean_t *found_deny)
+{
+ struct vnode_attr *vap = vcp->vap;
+ kauth_cred_t cred = vcp->ctx->vc_ucred;
+ struct kauth_acl_eval eval;
+ int error, ismember;
+ mode_t posix_action;
/*
- * Quickly check for the applicability of any enforcement here.
- * Tests below maintain the integrity of the local security model.
+ * If we are the file owner, we automatically have some rights.
+ *
+ * Do we need to expand this to support group ownership?
*/
- if (vfs_authopaque(vnode_mount(dvp)))
- goto out;
+ if (vauth_file_owner(vcp))
+ acl_rights &= ~(KAUTH_VNODE_WRITE_SECURITY);
/*
- * We need to know if the caller is the superuser, or if the work is
- * otherwise already authorised.
+ * If we are checking both TAKE_OWNERSHIP and WRITE_SECURITY, we can
+ * mask the latter. If TAKE_OWNERSHIP is requested the caller is about to
+ * change ownership to themselves, and WRITE_SECURITY is implicitly
+ * granted to the owner. We need to do this because at this point
+ * WRITE_SECURITY may not be granted as the caller is not currently
+ * the owner.
*/
- cred = vfs_context_ucred(ctx);
- if (noauth) {
- /* doing work for the kernel */
- is_suser = 1;
- } else {
- is_suser = vfs_context_issuser(ctx);
+ if ((acl_rights & KAUTH_VNODE_TAKE_OWNERSHIP) &&
+ (acl_rights & KAUTH_VNODE_WRITE_SECURITY))
+ acl_rights &= ~KAUTH_VNODE_WRITE_SECURITY;
+
+ if (acl_rights == 0) {
+ KAUTH_DEBUG("%p ALLOWED - implicit or no rights required", vcp->vp);
+ return(0);
}
-
- if (VATTR_IS_ACTIVE(vap, va_flags)) {
- if (is_suser) {
- if ((vap->va_flags & (UF_SETTABLE | SF_SETTABLE)) != vap->va_flags) {
- error = EPERM;
- KAUTH_DEBUG(" DENIED - superuser attempt to set illegal flag(s)");
- goto out;
- }
- } else {
- if ((vap->va_flags & UF_SETTABLE) != vap->va_flags) {
- error = EPERM;
- KAUTH_DEBUG(" DENIED - user attempt to set illegal flag(s)");
- goto out;
- }
+ /* if we have an ACL, evaluate it */
+ if (VATTR_IS_NOT(vap, va_acl, NULL)) {
+ eval.ae_requested = acl_rights;
+ eval.ae_acl = &vap->va_acl->acl_ace[0];
+ eval.ae_count = vap->va_acl->acl_entrycount;
+ eval.ae_options = 0;
+ if (vauth_file_owner(vcp))
+ eval.ae_options |= KAUTH_AEVAL_IS_OWNER;
+ /*
+ * We use ENOENT as a marker to indicate we could not get
+ * information in order to delay evaluation until after we
+ * have the ACL evaluation answer. Previously, we would
+ * always deny the operation at this point.
+ */
+ if ((error = vauth_file_ingroup(vcp, &ismember, ENOENT)) != 0 && error != ENOENT)
+ return(error);
+ if (error == ENOENT)
+ eval.ae_options |= KAUTH_AEVAL_IN_GROUP_UNKNOWN;
+ else if (ismember)
+ eval.ae_options |= KAUTH_AEVAL_IN_GROUP;
+ eval.ae_exp_gall = KAUTH_VNODE_GENERIC_ALL_BITS;
+ eval.ae_exp_gread = KAUTH_VNODE_GENERIC_READ_BITS;
+ eval.ae_exp_gwrite = KAUTH_VNODE_GENERIC_WRITE_BITS;
+ eval.ae_exp_gexec = KAUTH_VNODE_GENERIC_EXECUTE_BITS;
+
+ if ((error = kauth_acl_evaluate(cred, &eval)) != 0) {
+ KAUTH_DEBUG("%p ERROR during ACL processing - %d", vcp->vp, error);
+ return(error);
+ }
+
+ switch(eval.ae_result) {
+ case KAUTH_RESULT_DENY:
+ KAUTH_DEBUG("%p DENIED - by ACL", vcp->vp);
+ return(EACCES); /* deny, deny, counter-allege */
+ case KAUTH_RESULT_ALLOW:
+ KAUTH_DEBUG("%p ALLOWED - all rights granted by ACL", vcp->vp);
+ return(0);
+ case KAUTH_RESULT_DEFER:
+ default:
+ /* Effectively the same as !delete_child_denied */
+ KAUTH_DEBUG("%p DEFERRED - directory ACL", vcp->vp);
+ break;
}
- }
- /* if not superuser, validate legality of new-item attributes */
- if (!is_suser) {
- if (!defaulted_mode && VATTR_IS_ACTIVE(vap, va_mode)) {
- /* setgid? */
- if (vap->va_mode & S_ISGID) {
- if ((error = kauth_cred_ismember_gid(cred, vap->va_gid, &ismember)) != 0) {
- KAUTH_DEBUG("ATTR - ERROR: got %d checking for membership in %d", error, vap->va_gid);
- goto out;
- }
- if (!ismember) {
- KAUTH_DEBUG(" DENIED - can't set SGID bit, not a member of %d", vap->va_gid);
- error = EPERM;
- goto out;
- }
- }
-
- /* setuid? */
- if ((vap->va_mode & S_ISUID) && (vap->va_uid != kauth_cred_getuid(cred))) {
- KAUTH_DEBUG("ATTR - ERROR: illegal attempt to set the setuid bit");
- error = EPERM;
- goto out;
- }
- }
- if (!defaulted_owner && (vap->va_uid != kauth_cred_getuid(cred))) {
- KAUTH_DEBUG(" DENIED - cannot create new item owned by %d", vap->va_uid);
- error = EPERM;
- goto out;
- }
- if (!defaulted_group) {
- if ((error = kauth_cred_ismember_gid(cred, vap->va_gid, &ismember)) != 0) {
- KAUTH_DEBUG(" ERROR - got %d checking for membership in %d", error, vap->va_gid);
- goto out;
- }
- if (!ismember) {
- KAUTH_DEBUG(" DENIED - cannot create new item with group %d - not a member", vap->va_gid);
- error = EPERM;
- goto out;
- }
- }
+ *found_deny = eval.ae_found_deny;
- /* initialising owner/group UUID */
- if (VATTR_IS_ACTIVE(vap, va_uuuid)) {
- if ((error = kauth_cred_getguid(cred, &changer)) != 0) {
- KAUTH_DEBUG(" ERROR - got %d trying to get caller UUID", error);
- /* XXX ENOENT here - no GUID - should perhaps become EPERM */
- goto out;
- }
- if (!kauth_guid_equal(&vap->va_uuuid, &changer)) {
- KAUTH_DEBUG(" ERROR - cannot create item with supplied owner UUID - not us");
- error = EPERM;
- goto out;
- }
- }
- if (VATTR_IS_ACTIVE(vap, va_guuid)) {
- if ((error = kauth_cred_ismember_guid(cred, &vap->va_guuid, &ismember)) != 0) {
- KAUTH_DEBUG(" ERROR - got %d trying to check group membership", error);
- goto out;
- }
- if (!ismember) {
- KAUTH_DEBUG(" ERROR - cannot create item with supplied group UUID - not a member");
- error = EPERM;
- goto out;
- }
- }
+ /* fall through and evaluate residual rights */
+ } else {
+ /* no ACL, everything is residual */
+ eval.ae_residual = acl_rights;
}
-out:
- return(error);
-}
-
-/*
- * Check that the attribute information in vap can be legally written by the context.
- *
- * Call this when you're not sure about the vnode_attr; either its contents have come
- * from an unknown source, or when they are variable.
- *
- * Returns errno, or zero and sets *actionp to the KAUTH_VNODE_* actions that
- * must be authorized to be permitted to write the vattr.
- */
-int
-vnode_authattr(vnode_t vp, struct vnode_attr *vap, kauth_action_t *actionp, vfs_context_t ctx)
-{
- struct vnode_attr ova;
- kauth_action_t required_action;
- int error, is_suser, ismember, chowner, chgroup;
- guid_t changer;
- gid_t group;
- uid_t owner;
- mode_t newmode;
- kauth_cred_t cred;
- uint32_t fdelta;
-
- VATTR_INIT(&ova);
- required_action = 0;
- error = 0;
/*
- * Quickly check for enforcement applicability.
- */
- if (vfs_authopaque(vnode_mount(vp)))
- goto out;
-
- /*
- * Check for attempts to set nonsensical fields.
+ * Grant residual rights that have been pre-authorized.
*/
- if (vap->va_active & VNODE_ATTR_RDONLY) {
- KAUTH_DEBUG("ATTR - ERROR: attempt to set readonly attribute(s)");
- error = EINVAL;
- goto out;
- }
+ eval.ae_residual &= ~preauth_rights;
/*
- * We need to know if the caller is the superuser.
+ * We grant WRITE_ATTRIBUTES to the owner if it hasn't been denied.
*/
- cred = vfs_context_ucred(ctx);
- is_suser = kauth_cred_issuser(cred);
+ if (vauth_file_owner(vcp))
+ eval.ae_residual &= ~KAUTH_VNODE_WRITE_ATTRIBUTES;
+
+ if (eval.ae_residual == 0) {
+ KAUTH_DEBUG("%p ALLOWED - rights already authorized", vcp->vp);
+ return(0);
+ }
/*
- * If any of the following are changing, we need information from the old file:
- * va_uid
- * va_gid
- * va_mode
- * va_uuuid
- * va_guuid
+ * Bail if we have residual rights that can't be granted by posix permissions,
+ * or aren't presumed granted at this point.
+ *
+ * XXX these can be collapsed for performance
*/
- if (VATTR_IS_ACTIVE(vap, va_uid) ||
- VATTR_IS_ACTIVE(vap, va_gid) ||
- VATTR_IS_ACTIVE(vap, va_mode) ||
- VATTR_IS_ACTIVE(vap, va_uuuid) ||
- VATTR_IS_ACTIVE(vap, va_guuid)) {
- VATTR_WANTED(&ova, va_mode);
- VATTR_WANTED(&ova, va_uid);
- VATTR_WANTED(&ova, va_gid);
- VATTR_WANTED(&ova, va_uuuid);
- VATTR_WANTED(&ova, va_guuid);
- KAUTH_DEBUG("ATTR - security information changing, fetching existing attributes");
+ if (eval.ae_residual & KAUTH_VNODE_CHANGE_OWNER) {
+ KAUTH_DEBUG("%p DENIED - CHANGE_OWNER not permitted", vcp->vp);
+ return(EACCES);
+ }
+ if (eval.ae_residual & KAUTH_VNODE_WRITE_SECURITY) {
+ KAUTH_DEBUG("%p DENIED - WRITE_SECURITY not permitted", vcp->vp);
+ return(EACCES);
}
- /*
- * If timestamps are being changed, we need to know who the file is owned
- * by.
- */
- if (VATTR_IS_ACTIVE(vap, va_create_time) ||
- VATTR_IS_ACTIVE(vap, va_change_time) ||
- VATTR_IS_ACTIVE(vap, va_modify_time) ||
- VATTR_IS_ACTIVE(vap, va_access_time) ||
- VATTR_IS_ACTIVE(vap, va_backup_time)) {
-
- VATTR_WANTED(&ova, va_uid);
-#if 0 /* enable this when we support UUIDs as official owners */
- VATTR_WANTED(&ova, va_uuuid);
+#if DIAGNOSTIC
+ if (eval.ae_residual & KAUTH_VNODE_DELETE)
+ panic("vnode_authorize: can't be checking delete permission here");
#endif
- KAUTH_DEBUG("ATTR - timestamps changing, fetching uid and GUID");
- }
-
- /*
- * If flags are being changed, we need the old flags.
- */
- if (VATTR_IS_ACTIVE(vap, va_flags)) {
- KAUTH_DEBUG("ATTR - flags changing, fetching old flags");
- VATTR_WANTED(&ova, va_flags);
- }
/*
- * If the size is being set, make sure it's not a directory.
+ * Compute the fallback posix permissions that will satisfy the remaining
+ * rights.
*/
- if (VATTR_IS_ACTIVE(vap, va_data_size)) {
- /* size is meaningless on a directory, don't permit this */
- if (vnode_isdir(vp)) {
- KAUTH_DEBUG("ATTR - ERROR: size change requested on a directory");
- error = EISDIR;
- goto out;
- }
+ posix_action = 0;
+ if (eval.ae_residual & (KAUTH_VNODE_READ_DATA |
+ KAUTH_VNODE_LIST_DIRECTORY |
+ KAUTH_VNODE_READ_EXTATTRIBUTES))
+ posix_action |= VREAD;
+ if (eval.ae_residual & (KAUTH_VNODE_WRITE_DATA |
+ KAUTH_VNODE_ADD_FILE |
+ KAUTH_VNODE_ADD_SUBDIRECTORY |
+ KAUTH_VNODE_DELETE_CHILD |
+ KAUTH_VNODE_WRITE_ATTRIBUTES |
+ KAUTH_VNODE_WRITE_EXTATTRIBUTES))
+ posix_action |= VWRITE;
+ if (eval.ae_residual & (KAUTH_VNODE_EXECUTE |
+ KAUTH_VNODE_SEARCH))
+ posix_action |= VEXEC;
+
+ if (posix_action != 0) {
+ return(vnode_authorize_posix(vcp, posix_action, 0 /* !on_dir */));
+ } else {
+ KAUTH_DEBUG("%p ALLOWED - residual rights %s%s%s%s%s%s%s%s%s%s%s%s%s%s granted due to no posix mapping",
+ vcp->vp,
+ (eval.ae_residual & KAUTH_VNODE_READ_DATA)
+ ? vnode_isdir(vcp->vp) ? " LIST_DIRECTORY" : " READ_DATA" : "",
+ (eval.ae_residual & KAUTH_VNODE_WRITE_DATA)
+ ? vnode_isdir(vcp->vp) ? " ADD_FILE" : " WRITE_DATA" : "",
+ (eval.ae_residual & KAUTH_VNODE_EXECUTE)
+ ? vnode_isdir(vcp->vp) ? " SEARCH" : " EXECUTE" : "",
+ (eval.ae_residual & KAUTH_VNODE_DELETE)
+ ? " DELETE" : "",
+ (eval.ae_residual & KAUTH_VNODE_APPEND_DATA)
+ ? vnode_isdir(vcp->vp) ? " ADD_SUBDIRECTORY" : " APPEND_DATA" : "",
+ (eval.ae_residual & KAUTH_VNODE_DELETE_CHILD)
+ ? " DELETE_CHILD" : "",
+ (eval.ae_residual & KAUTH_VNODE_READ_ATTRIBUTES)
+ ? " READ_ATTRIBUTES" : "",
+ (eval.ae_residual & KAUTH_VNODE_WRITE_ATTRIBUTES)
+ ? " WRITE_ATTRIBUTES" : "",
+ (eval.ae_residual & KAUTH_VNODE_READ_EXTATTRIBUTES)
+ ? " READ_EXTATTRIBUTES" : "",
+ (eval.ae_residual & KAUTH_VNODE_WRITE_EXTATTRIBUTES)
+ ? " WRITE_EXTATTRIBUTES" : "",
+ (eval.ae_residual & KAUTH_VNODE_READ_SECURITY)
+ ? " READ_SECURITY" : "",
+ (eval.ae_residual & KAUTH_VNODE_WRITE_SECURITY)
+ ? " WRITE_SECURITY" : "",
+ (eval.ae_residual & KAUTH_VNODE_CHECKIMMUTABLE)
+ ? " CHECKIMMUTABLE" : "",
+ (eval.ae_residual & KAUTH_VNODE_CHANGE_OWNER)
+ ? " CHANGE_OWNER" : "");
}
/*
- * Get old data.
+ * Lack of required Posix permissions implies no reason to deny access.
*/
- KAUTH_DEBUG("ATTR - fetching old attributes %016llx", ova.va_active);
- if ((error = vnode_getattr(vp, &ova, ctx)) != 0) {
- KAUTH_DEBUG(" ERROR - got %d trying to get attributes", error);
- goto out;
- }
+ return(0);
+}
- /*
- * Size changes require write access to the file data.
- */
- if (VATTR_IS_ACTIVE(vap, va_data_size)) {
- /* if we can't get the size, or it's different, we need write access */
- KAUTH_DEBUG("ATTR - size change, requiring WRITE_DATA");
- required_action |= KAUTH_VNODE_WRITE_DATA;
- }
+/*
+ * Check for file immutability.
+ */
+static int
+vnode_authorize_checkimmutable(mount_t mp, struct vnode_attr *vap, int rights, int ignore)
+{
+ int error;
+ int append;
/*
- * Changing timestamps?
- *
- * Note that we are only called to authorize user-requested time changes;
- * side-effect time changes are not authorized. Authorisation is only
- * required for existing files.
+ * Perform immutability checks for operations that change data.
*
- * Non-owners are not permitted to change the time on an existing
- * file to anything other than the current time.
+ * Sockets, fifos and devices require special handling.
*/
- if (VATTR_IS_ACTIVE(vap, va_create_time) ||
- VATTR_IS_ACTIVE(vap, va_change_time) ||
- VATTR_IS_ACTIVE(vap, va_modify_time) ||
- VATTR_IS_ACTIVE(vap, va_access_time) ||
- VATTR_IS_ACTIVE(vap, va_backup_time)) {
+ switch(vap->va_type) {
+ case VSOCK:
+ case VFIFO:
+ case VBLK:
+ case VCHR:
/*
- * The owner and root may set any timestamps they like,
- * provided that the file is not immutable. The owner still needs
- * WRITE_ATTRIBUTES (implied by ownership but still deniable).
+ * Writing to these nodes does not change the filesystem data,
+ * so forget that it's being tried.
*/
- if (is_suser || vauth_node_owner(&ova, cred)) {
- KAUTH_DEBUG("ATTR - root or owner changing timestamps");
- required_action |= KAUTH_VNODE_CHECKIMMUTABLE | KAUTH_VNODE_WRITE_ATTRIBUTES;
- } else {
- /* just setting the current time? */
- if (vap->va_vaflags & VA_UTIMES_NULL) {
- KAUTH_DEBUG("ATTR - non-root/owner changing timestamps, requiring WRITE_ATTRIBUTES");
- required_action |= KAUTH_VNODE_WRITE_ATTRIBUTES;
- } else {
- KAUTH_DEBUG("ATTR - ERROR: illegal timestamp modification attempted");
- error = EACCES;
+ rights &= ~KAUTH_VNODE_WRITE_DATA;
+ break;
+ default:
+ break;
+ }
+
+ error = 0;
+ if (rights & KAUTH_VNODE_WRITE_RIGHTS) {
+
+ /* check per-filesystem options if possible */
+ if (mp != NULL) {
+
+ /* check for no-EA filesystems */
+ if ((rights & KAUTH_VNODE_WRITE_EXTATTRIBUTES) &&
+ (vfs_flags(mp) & MNT_NOUSERXATTR)) {
+ KAUTH_DEBUG("%p DENIED - filesystem disallowed extended attributes", vp);
+ error = EACCES; /* User attributes disabled */
goto out;
}
}
+
+ /*
+ * check for file immutability. first, check if the requested rights are
+ * allowable for a UF_APPEND file.
+ */
+ append = 0;
+ if (vap->va_type == VDIR) {
+ if ((rights & (KAUTH_VNODE_ADD_FILE | KAUTH_VNODE_ADD_SUBDIRECTORY | KAUTH_VNODE_WRITE_EXTATTRIBUTES)) == rights)
+ append = 1;
+ } else {
+ if ((rights & (KAUTH_VNODE_APPEND_DATA | KAUTH_VNODE_WRITE_EXTATTRIBUTES)) == rights)
+ append = 1;
+ }
+ if ((error = vnode_immutable(vap, append, ignore)) != 0) {
+ KAUTH_DEBUG("%p DENIED - file is immutable", vp);
+ goto out;
+ }
}
+out:
+ return(error);
+}
+
+/*
+ * Handle authorization actions for filesystems that advertise that the
+ * server will be enforcing.
+ *
+ * Returns: 0 Authorization should be handled locally
+ * 1 Authorization was handled by the FS
+ *
+ * Note: Imputed returns will only occur if the authorization request
+ * was handled by the FS.
+ *
+ * Imputed: *resultp, modified Return code from FS when the request is
+ * handled by the FS.
+ * VNOP_ACCESS:???
+ * VNOP_OPEN:???
+ */
+static int
+vnode_authorize_opaque(vnode_t vp, int *resultp, kauth_action_t action, vfs_context_t ctx)
+{
+ int error;
/*
- * Changing file mode?
+ * If the vp is a device node, socket or FIFO it actually represents a local
+ * endpoint, so we need to handle it locally.
*/
- if (VATTR_IS_ACTIVE(vap, va_mode) && VATTR_IS_SUPPORTED(&ova, va_mode) && (ova.va_mode != vap->va_mode)) {
- KAUTH_DEBUG("ATTR - mode change from %06o to %06o", ova.va_mode, vap->va_mode);
+ switch(vp->v_type) {
+ case VBLK:
+ case VCHR:
+ case VSOCK:
+ case VFIFO:
+ return(0);
+ default:
+ break;
+ }
- /*
- * Mode changes always have the same basic auth requirements.
- */
- if (is_suser) {
- KAUTH_DEBUG("ATTR - superuser mode change, requiring immutability check");
- required_action |= KAUTH_VNODE_CHECKIMMUTABLE;
- } else {
- /* need WRITE_SECURITY */
- KAUTH_DEBUG("ATTR - non-superuser mode change, requiring WRITE_SECURITY");
- required_action |= KAUTH_VNODE_WRITE_SECURITY;
+ /*
+ * In the advisory request case, if the filesystem doesn't think it's reliable
+ * we will attempt to formulate a result ourselves based on VNOP_GETATTR data.
+ */
+ if ((action & KAUTH_VNODE_ACCESS) && !vfs_authopaqueaccess(vp->v_mount))
+ return(0);
+
+ /*
+ * Let the filesystem have a say in the matter. It's OK for it to not implemnent
+ * VNOP_ACCESS, as most will authorise inline with the actual request.
+ */
+ if ((error = VNOP_ACCESS(vp, action, ctx)) != ENOTSUP) {
+ *resultp = error;
+ KAUTH_DEBUG("%p DENIED - opaque filesystem VNOP_ACCESS denied access", vp);
+ return(1);
+ }
+
+ /*
+ * Typically opaque filesystems do authorisation in-line, but exec is a special case. In
+ * order to be reasonably sure that exec will be permitted, we try a bit harder here.
+ */
+ if ((action & KAUTH_VNODE_EXECUTE) && (vp->v_type == VREG)) {
+ /* try a VNOP_OPEN for readonly access */
+ if ((error = VNOP_OPEN(vp, FREAD, ctx)) != 0) {
+ *resultp = error;
+ KAUTH_DEBUG("%p DENIED - EXECUTE denied because file could not be opened readonly", vp);
+ return(1);
}
+ VNOP_CLOSE(vp, FREAD, ctx);
+ }
- /*
- * Can't set the setgid bit if you're not in the group and not root. Have to have
- * existing group information in the case we're not setting it right now.
+ /*
+ * We don't have any reason to believe that the request has to be denied at this point,
+ * so go ahead and allow it.
+ */
+ *resultp = 0;
+ KAUTH_DEBUG("%p ALLOWED - bypassing access check for non-local filesystem", vp);
+ return(1);
+}
+
+
+
+
+/*
+ * Returns: KAUTH_RESULT_ALLOW
+ * KAUTH_RESULT_DENY
+ *
+ * Imputed: *arg3, modified Error code in the deny case
+ * EROFS Read-only file system
+ * EACCES Permission denied
+ * EPERM Operation not permitted [no execute]
+ * vnode_getattr:ENOMEM Not enough space [only if has filesec]
+ * vnode_getattr:???
+ * vnode_authorize_opaque:*arg2 ???
+ * vnode_authorize_checkimmutable:???
+ * vnode_authorize_delete:???
+ * vnode_authorize_simple:???
+ */
+
+
+static int
+vnode_authorize_callback(__unused kauth_cred_t cred, __unused void *idata,
+ kauth_action_t action, uintptr_t arg0, uintptr_t arg1, uintptr_t arg2,
+ uintptr_t arg3)
+{
+ vfs_context_t ctx;
+ vnode_t cvp = NULLVP;
+ vnode_t vp, dvp;
+ int result = KAUTH_RESULT_DENY;
+ int parent_iocount = 0;
+ int parent_action; /* In case we need to use namedstream's data fork for cached rights*/
+
+ ctx = (vfs_context_t)arg0;
+ vp = (vnode_t)arg1;
+ dvp = (vnode_t)arg2;
+
+ /*
+ * if there are 2 vnodes passed in, we don't know at
+ * this point which rights to look at based on the
+ * combined action being passed in... defer until later...
+ * otherwise check the kauth 'rights' cache hung
+ * off of the vnode we're interested in... if we've already
+ * been granted the right we're currently interested in,
+ * we can just return success... otherwise we'll go through
+ * the process of authorizing the requested right(s)... if that
+ * succeeds, we'll add the right(s) to the cache.
+ * VNOP_SETATTR and VNOP_SETXATTR will invalidate this cache
+ */
+ if (dvp && vp)
+ goto defer;
+ if (dvp) {
+ cvp = dvp;
+ } else {
+ /*
+ * For named streams on local-authorization volumes, rights are cached on the parent;
+ * authorization is determined by looking at the parent's properties anyway, so storing
+ * on the parent means that we don't recompute for the named stream and that if
+ * we need to flush rights (e.g. on VNOP_SETATTR()) we don't need to track down the
+ * stream to flush its cache separately. If we miss in the cache, then we authorize
+ * as if there were no cached rights (passing the named stream vnode and desired rights to
+ * vnode_authorize_callback_int()).
+ *
+ * On an opaquely authorized volume, we don't know the relationship between the
+ * data fork's properties and the rights granted on a stream. Thus, named stream vnodes
+ * on such a volume are authorized directly (rather than using the parent) and have their
+ * own caches. When a named stream vnode is created, we mark the parent as having a named
+ * stream. On a VNOP_SETATTR() for the parent that may invalidate cached authorization, we
+ * find the stream and flush its cache.
*/
- if (vap->va_mode & S_ISGID) {
- required_action |= KAUTH_VNODE_CHECKIMMUTABLE; /* always required */
- if (!is_suser) {
- if (VATTR_IS_ACTIVE(vap, va_gid)) {
- group = vap->va_gid;
- } else if (VATTR_IS_SUPPORTED(&ova, va_gid)) {
- group = ova.va_gid;
- } else {
- KAUTH_DEBUG("ATTR - ERROR: setgid but no gid available");
- error = EINVAL;
- goto out;
- }
- /*
- * This might be too restrictive; WRITE_SECURITY might be implied by
- * membership in this case, rather than being an additional requirement.
- */
- if ((error = kauth_cred_ismember_gid(cred, group, &ismember)) != 0) {
- KAUTH_DEBUG("ATTR - ERROR: got %d checking for membership in %d", error, vap->va_gid);
- goto out;
- }
- if (!ismember) {
- KAUTH_DEBUG(" DENIED - can't set SGID bit, not a member of %d", group);
- error = EPERM;
- goto out;
- }
+ if (vnode_isnamedstream(vp) && (!vfs_authopaque(vp->v_mount))) {
+ cvp = vnode_getparent(vp);
+ if (cvp != NULLVP) {
+ parent_iocount = 1;
+ } else {
+ cvp = NULL;
+ goto defer; /* If we can't use the parent, take the slow path */
}
- }
- /*
- * Can't set the setuid bit unless you're root or the file's owner.
- */
- if (vap->va_mode & S_ISUID) {
- required_action |= KAUTH_VNODE_CHECKIMMUTABLE; /* always required */
- if (!is_suser) {
- if (VATTR_IS_ACTIVE(vap, va_uid)) {
- owner = vap->va_uid;
- } else if (VATTR_IS_SUPPORTED(&ova, va_uid)) {
- owner = ova.va_uid;
- } else {
- KAUTH_DEBUG("ATTR - ERROR: setuid but no uid available");
- error = EINVAL;
- goto out;
- }
- if (owner != kauth_cred_getuid(cred)) {
- /*
- * We could allow this if WRITE_SECURITY is permitted, perhaps.
- */
- KAUTH_DEBUG("ATTR - ERROR: illegal attempt to set the setuid bit");
- error = EPERM;
- goto out;
- }
+ /* Have to translate some actions */
+ parent_action = action;
+ if (parent_action & KAUTH_VNODE_READ_DATA) {
+ parent_action &= ~KAUTH_VNODE_READ_DATA;
+ parent_action |= KAUTH_VNODE_READ_EXTATTRIBUTES;
+ }
+ if (parent_action & KAUTH_VNODE_WRITE_DATA) {
+ parent_action &= ~KAUTH_VNODE_WRITE_DATA;
+ parent_action |= KAUTH_VNODE_WRITE_EXTATTRIBUTES;
}
+
+ } else {
+ cvp = vp;
}
}
-
+
+ if (vnode_cache_is_authorized(cvp, ctx, parent_iocount ? parent_action : action) == TRUE) {
+ result = KAUTH_RESULT_ALLOW;
+ goto out;
+ }
+defer:
+ result = vnode_authorize_callback_int(action, ctx, vp, dvp, (int *)arg3);
+
+ if (result == KAUTH_RESULT_ALLOW && cvp != NULLVP) {
+ KAUTH_DEBUG("%p - caching action = %x", cvp, action);
+ vnode_cache_authorized_action(cvp, ctx, action);
+ }
+
+out:
+ if (parent_iocount) {
+ vnode_put(cvp);
+ }
+
+ return result;
+}
+
+static int
+vnode_attr_authorize_internal(vauth_ctx vcp, mount_t mp,
+ kauth_ace_rights_t rights, int is_suser, boolean_t *found_deny,
+ int noimmutable, int parent_authorized_for_delete_child)
+{
+ int result;
+
/*
- * Validate/mask flags changes. This checks that only the flags in
- * the UF_SETTABLE mask are being set, and preserves the flags in
- * the SF_SETTABLE case.
+ * Check for immutability.
*
- * Since flags changes may be made in conjunction with other changes,
- * we will ask the auth code to ignore immutability in the case that
- * the SF_* flags are not set and we are only manipulating the file flags.
- *
+ * In the deletion case, parent directory immutability vetoes specific
+ * file rights.
*/
- if (VATTR_IS_ACTIVE(vap, va_flags)) {
- /* compute changing flags bits */
- if (VATTR_IS_SUPPORTED(&ova, va_flags)) {
- fdelta = vap->va_flags ^ ova.va_flags;
- } else {
- fdelta = vap->va_flags;
- }
+ if ((result = vnode_authorize_checkimmutable(mp, vcp->vap, rights,
+ noimmutable)) != 0)
+ goto out;
- if (fdelta != 0) {
- KAUTH_DEBUG("ATTR - flags changing, requiring WRITE_SECURITY");
- required_action |= KAUTH_VNODE_WRITE_SECURITY;
+ if ((rights & KAUTH_VNODE_DELETE) &&
+ !parent_authorized_for_delete_child) {
+ result = vnode_authorize_checkimmutable(mp, vcp->dvap,
+ KAUTH_VNODE_DELETE_CHILD, 0);
+ if (result)
+ goto out;
+ }
- /* check that changing bits are legal */
- if (is_suser) {
- /*
- * The immutability check will prevent us from clearing the SF_*
- * flags unless the system securelevel permits it, so just check
- * for legal flags here.
- */
- if (fdelta & ~(UF_SETTABLE | SF_SETTABLE)) {
- error = EPERM;
- KAUTH_DEBUG(" DENIED - superuser attempt to set illegal flag(s)");
- goto out;
- }
- } else {
- if (fdelta & ~UF_SETTABLE) {
- error = EPERM;
- KAUTH_DEBUG(" DENIED - user attempt to set illegal flag(s)");
- goto out;
- }
- }
- /*
- * If the caller has the ability to manipulate file flags,
- * security is not reduced by ignoring them for this operation.
- *
+ /*
+ * Clear rights that have been authorized by reaching this point, bail if nothing left to
+ * check.
+ */
+ rights &= ~(KAUTH_VNODE_LINKTARGET | KAUTH_VNODE_CHECKIMMUTABLE);
+ if (rights == 0)
+ goto out;
+
+ /*
+ * If we're not the superuser, authorize based on file properties;
+ * note that even if parent_authorized_for_delete_child is TRUE, we
+ * need to check on the node itself.
+ */
+ if (!is_suser) {
+ /* process delete rights */
+ if ((rights & KAUTH_VNODE_DELETE) &&
+ ((result = vnode_authorize_delete(vcp, parent_authorized_for_delete_child)) != 0))
+ goto out;
+
+ /* process remaining rights */
+ if ((rights & ~KAUTH_VNODE_DELETE) &&
+ (result = vnode_authorize_simple(vcp, rights, rights & KAUTH_VNODE_DELETE, found_deny)) != 0)
+ goto out;
+ } else {
+ /*
+ * Execute is only granted to root if one of the x bits is set. This check only
+ * makes sense if the posix mode bits are actually supported.
+ */
+ if ((rights & KAUTH_VNODE_EXECUTE) &&
+ (vcp->vap->va_type == VREG) &&
+ VATTR_IS_SUPPORTED(vcp->vap, va_mode) &&
+ !(vcp->vap->va_mode & (S_IXUSR | S_IXGRP | S_IXOTH))) {
+ result = EPERM;
+ KAUTH_DEBUG("%p DENIED - root execute requires at least one x bit in 0x%x", vp, va.va_mode);
+ goto out;
+ }
+
+ /* Assume that there were DENYs so we don't wrongly cache KAUTH_VNODE_SEARCHBYANYONE */
+ *found_deny = TRUE;
+
+ KAUTH_DEBUG("%p ALLOWED - caller is superuser", vp);
+ }
+out:
+ return (result);
+}
+
+static int
+vnode_authorize_callback_int(kauth_action_t action, vfs_context_t ctx,
+ vnode_t vp, vnode_t dvp, int *errorp)
+{
+ struct _vnode_authorize_context auth_context;
+ vauth_ctx vcp;
+ kauth_cred_t cred;
+ kauth_ace_rights_t rights;
+ struct vnode_attr va, dva;
+ int result;
+ int noimmutable;
+ boolean_t parent_authorized_for_delete_child = FALSE;
+ boolean_t found_deny = FALSE;
+ boolean_t parent_ref= FALSE;
+ boolean_t is_suser = FALSE;
+
+ vcp = &auth_context;
+ vcp->ctx = ctx;
+ vcp->vp = vp;
+ vcp->dvp = dvp;
+ /*
+ * Note that we authorize against the context, not the passed cred
+ * (the same thing anyway)
+ */
+ cred = ctx->vc_ucred;
+
+ VATTR_INIT(&va);
+ vcp->vap = &va;
+ VATTR_INIT(&dva);
+ vcp->dvap = &dva;
+
+ vcp->flags = vcp->flags_valid = 0;
+
+#if DIAGNOSTIC
+ if ((ctx == NULL) || (vp == NULL) || (cred == NULL))
+ panic("vnode_authorize: bad arguments (context %p vp %p cred %p)", ctx, vp, cred);
+#endif
+
+ KAUTH_DEBUG("%p AUTH - %s %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s on %s '%s' (0x%x:%p/%p)",
+ vp, vfs_context_proc(ctx)->p_comm,
+ (action & KAUTH_VNODE_ACCESS) ? "access" : "auth",
+ (action & KAUTH_VNODE_READ_DATA) ? vnode_isdir(vp) ? " LIST_DIRECTORY" : " READ_DATA" : "",
+ (action & KAUTH_VNODE_WRITE_DATA) ? vnode_isdir(vp) ? " ADD_FILE" : " WRITE_DATA" : "",
+ (action & KAUTH_VNODE_EXECUTE) ? vnode_isdir(vp) ? " SEARCH" : " EXECUTE" : "",
+ (action & KAUTH_VNODE_DELETE) ? " DELETE" : "",
+ (action & KAUTH_VNODE_APPEND_DATA) ? vnode_isdir(vp) ? " ADD_SUBDIRECTORY" : " APPEND_DATA" : "",
+ (action & KAUTH_VNODE_DELETE_CHILD) ? " DELETE_CHILD" : "",
+ (action & KAUTH_VNODE_READ_ATTRIBUTES) ? " READ_ATTRIBUTES" : "",
+ (action & KAUTH_VNODE_WRITE_ATTRIBUTES) ? " WRITE_ATTRIBUTES" : "",
+ (action & KAUTH_VNODE_READ_EXTATTRIBUTES) ? " READ_EXTATTRIBUTES" : "",
+ (action & KAUTH_VNODE_WRITE_EXTATTRIBUTES) ? " WRITE_EXTATTRIBUTES" : "",
+ (action & KAUTH_VNODE_READ_SECURITY) ? " READ_SECURITY" : "",
+ (action & KAUTH_VNODE_WRITE_SECURITY) ? " WRITE_SECURITY" : "",
+ (action & KAUTH_VNODE_CHANGE_OWNER) ? " CHANGE_OWNER" : "",
+ (action & KAUTH_VNODE_NOIMMUTABLE) ? " (noimmutable)" : "",
+ vnode_isdir(vp) ? "directory" : "file",
+ vp->v_name ? vp->v_name : "<NULL>", action, vp, dvp);
+
+ /*
+ * Extract the control bits from the action, everything else is
+ * requested rights.
+ */
+ noimmutable = (action & KAUTH_VNODE_NOIMMUTABLE) ? 1 : 0;
+ rights = action & ~(KAUTH_VNODE_ACCESS | KAUTH_VNODE_NOIMMUTABLE);
+
+ if (rights & KAUTH_VNODE_DELETE) {
+#if DIAGNOSTIC
+ if (dvp == NULL)
+ panic("vnode_authorize: KAUTH_VNODE_DELETE test requires a directory");
+#endif
+ /*
+ * check to see if we've already authorized the parent
+ * directory for deletion of its children... if so, we
+ * can skip a whole bunch of work... we will still have to
+ * authorize that this specific child can be removed
+ */
+ if (vnode_cache_is_authorized(dvp, ctx, KAUTH_VNODE_DELETE_CHILD) == TRUE)
+ parent_authorized_for_delete_child = TRUE;
+ } else {
+ vcp->dvp = NULLVP;
+ vcp->dvap = NULL;
+ }
+
+ /*
+ * Check for read-only filesystems.
+ */
+ if ((rights & KAUTH_VNODE_WRITE_RIGHTS) &&
+ (vp->v_mount->mnt_flag & MNT_RDONLY) &&
+ ((vp->v_type == VREG) || (vp->v_type == VDIR) ||
+ (vp->v_type == VLNK) || (vp->v_type == VCPLX) ||
+ (rights & KAUTH_VNODE_DELETE) || (rights & KAUTH_VNODE_DELETE_CHILD))) {
+ result = EROFS;
+ goto out;
+ }
+
+ /*
+ * Check for noexec filesystems.
+ */
+ if ((rights & KAUTH_VNODE_EXECUTE) && (vp->v_type == VREG) && (vp->v_mount->mnt_flag & MNT_NOEXEC)) {
+ result = EACCES;
+ goto out;
+ }
+
+ /*
+ * Handle cases related to filesystems with non-local enforcement.
+ * This call can return 0, in which case we will fall through to perform a
+ * check based on VNOP_GETATTR data. Otherwise it returns 1 and sets
+ * an appropriate result, at which point we can return immediately.
+ */
+ if ((vp->v_mount->mnt_kern_flag & MNTK_AUTH_OPAQUE) && vnode_authorize_opaque(vp, &result, action, ctx))
+ goto out;
+
+ /*
+ * If the vnode is a namedstream (extended attribute) data vnode (eg.
+ * a resource fork), *_DATA becomes *_EXTATTRIBUTES.
+ */
+ if (vnode_isnamedstream(vp)) {
+ if (rights & KAUTH_VNODE_READ_DATA) {
+ rights &= ~KAUTH_VNODE_READ_DATA;
+ rights |= KAUTH_VNODE_READ_EXTATTRIBUTES;
+ }
+ if (rights & KAUTH_VNODE_WRITE_DATA) {
+ rights &= ~KAUTH_VNODE_WRITE_DATA;
+ rights |= KAUTH_VNODE_WRITE_EXTATTRIBUTES;
+ }
+
+ /*
+ * Point 'vp' to the namedstream's parent for ACL checking
+ */
+ if ((vp->v_parent != NULL) &&
+ (vget_internal(vp->v_parent, 0, VNODE_NODEAD | VNODE_DRAINO) == 0)) {
+ parent_ref = TRUE;
+ vcp->vp = vp = vp->v_parent;
+ }
+ }
+
+ if (vfs_context_issuser(ctx)) {
+ /*
+ * if we're not asking for execute permissions or modifications,
+ * then we're done, this action is authorized.
+ */
+ if (!(rights & (KAUTH_VNODE_EXECUTE | KAUTH_VNODE_WRITE_RIGHTS)))
+ goto success;
+
+ is_suser = TRUE;
+ }
+
+ /*
+ * Get vnode attributes and extended security information for the vnode
+ * and directory if required.
+ *
+ * If we're root we only want mode bits and flags for checking
+ * execute and immutability.
+ */
+ VATTR_WANTED(&va, va_mode);
+ VATTR_WANTED(&va, va_flags);
+ if (!is_suser) {
+ VATTR_WANTED(&va, va_uid);
+ VATTR_WANTED(&va, va_gid);
+ VATTR_WANTED(&va, va_acl);
+ }
+ if ((result = vnode_getattr(vp, &va, ctx)) != 0) {
+ KAUTH_DEBUG("%p ERROR - failed to get vnode attributes - %d", vp, result);
+ goto out;
+ }
+ VATTR_WANTED(&va, va_type);
+ VATTR_RETURN(&va, va_type, vnode_vtype(vp));
+
+ if (vcp->dvp) {
+ VATTR_WANTED(&dva, va_mode);
+ VATTR_WANTED(&dva, va_flags);
+ if (!is_suser) {
+ VATTR_WANTED(&dva, va_uid);
+ VATTR_WANTED(&dva, va_gid);
+ VATTR_WANTED(&dva, va_acl);
+ }
+ if ((result = vnode_getattr(vcp->dvp, &dva, ctx)) != 0) {
+ KAUTH_DEBUG("%p ERROR - failed to get directory vnode attributes - %d", vp, result);
+ goto out;
+ }
+ VATTR_WANTED(&dva, va_type);
+ VATTR_RETURN(&dva, va_type, vnode_vtype(vcp->dvp));
+ }
+
+ result = vnode_attr_authorize_internal(vcp, vp->v_mount, rights, is_suser,
+ &found_deny, noimmutable, parent_authorized_for_delete_child);
+out:
+ if (VATTR_IS_SUPPORTED(&va, va_acl) && (va.va_acl != NULL))
+ kauth_acl_free(va.va_acl);
+ if (VATTR_IS_SUPPORTED(&dva, va_acl) && (dva.va_acl != NULL))
+ kauth_acl_free(dva.va_acl);
+
+ if (result) {
+ if (parent_ref)
+ vnode_put(vp);
+ *errorp = result;
+ KAUTH_DEBUG("%p DENIED - auth denied", vp);
+ return(KAUTH_RESULT_DENY);
+ }
+ if ((rights & KAUTH_VNODE_SEARCH) && found_deny == FALSE && vp->v_type == VDIR) {
+ /*
+ * if we were successfully granted the right to search this directory
+ * and there were NO ACL DENYs for search and the posix permissions also don't
+ * deny execute, we can synthesize a global right that allows anyone to
+ * traverse this directory during a pathname lookup without having to
+ * match the credential associated with this cache of rights.
+ *
+ * Note that we can correctly cache KAUTH_VNODE_SEARCHBYANYONE
+ * only if we actually check ACLs which we don't for root. As
+ * a workaround, the lookup fast path checks for root.
+ */
+ if (!VATTR_IS_SUPPORTED(&va, va_mode) ||
+ ((va.va_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) ==
+ (S_IXUSR | S_IXGRP | S_IXOTH))) {
+ vnode_cache_authorized_action(vp, ctx, KAUTH_VNODE_SEARCHBYANYONE);
+ }
+ }
+success:
+ if (parent_ref)
+ vnode_put(vp);
+
+ /*
+ * Note that this implies that we will allow requests for no rights, as well as
+ * for rights that we do not recognise. There should be none of these.
+ */
+ KAUTH_DEBUG("%p ALLOWED - auth granted", vp);
+ return(KAUTH_RESULT_ALLOW);
+}
+
+int
+vnode_attr_authorize_init(struct vnode_attr *vap, struct vnode_attr *dvap,
+ kauth_action_t action, vfs_context_t ctx)
+{
+ VATTR_INIT(vap);
+ VATTR_WANTED(vap, va_type);
+ VATTR_WANTED(vap, va_mode);
+ VATTR_WANTED(vap, va_flags);
+ if (dvap) {
+ VATTR_INIT(dvap);
+ if (action & KAUTH_VNODE_DELETE) {
+ VATTR_WANTED(dvap, va_type);
+ VATTR_WANTED(dvap, va_mode);
+ VATTR_WANTED(dvap, va_flags);
+ }
+ } else if (action & KAUTH_VNODE_DELETE) {
+ return (EINVAL);
+ }
+
+ if (!vfs_context_issuser(ctx)) {
+ VATTR_WANTED(vap, va_uid);
+ VATTR_WANTED(vap, va_gid);
+ VATTR_WANTED(vap, va_acl);
+ if (dvap && (action & KAUTH_VNODE_DELETE)) {
+ VATTR_WANTED(dvap, va_uid);
+ VATTR_WANTED(dvap, va_gid);
+ VATTR_WANTED(dvap, va_acl);
+ }
+ }
+
+ return (0);
+}
+
+int
+vnode_attr_authorize(struct vnode_attr *vap, struct vnode_attr *dvap, mount_t mp,
+ kauth_action_t action, vfs_context_t ctx)
+{
+ struct _vnode_authorize_context auth_context;
+ vauth_ctx vcp;
+ kauth_ace_rights_t rights;
+ int noimmutable;
+ boolean_t found_deny;
+ boolean_t is_suser = FALSE;
+ int result = 0;
+
+ vcp = &auth_context;
+ vcp->ctx = ctx;
+ vcp->vp = NULLVP;
+ vcp->vap = vap;
+ vcp->dvp = NULLVP;
+ vcp->dvap = dvap;
+ vcp->flags = vcp->flags_valid = 0;
+
+ noimmutable = (action & KAUTH_VNODE_NOIMMUTABLE) ? 1 : 0;
+ rights = action & ~(KAUTH_VNODE_ACCESS | KAUTH_VNODE_NOIMMUTABLE);
+
+ /*
+ * Check for read-only filesystems.
+ */
+ if ((rights & KAUTH_VNODE_WRITE_RIGHTS) &&
+ mp && (mp->mnt_flag & MNT_RDONLY) &&
+ ((vap->va_type == VREG) || (vap->va_type == VDIR) ||
+ (vap->va_type == VLNK) || (rights & KAUTH_VNODE_DELETE) ||
+ (rights & KAUTH_VNODE_DELETE_CHILD))) {
+ result = EROFS;
+ goto out;
+ }
+
+ /*
+ * Check for noexec filesystems.
+ */
+ if ((rights & KAUTH_VNODE_EXECUTE) &&
+ (vap->va_type == VREG) && mp && (mp->mnt_flag & MNT_NOEXEC)) {
+ result = EACCES;
+ goto out;
+ }
+
+ if (vfs_context_issuser(ctx)) {
+ /*
+ * if we're not asking for execute permissions or modifications,
+ * then we're done, this action is authorized.
+ */
+ if (!(rights & (KAUTH_VNODE_EXECUTE | KAUTH_VNODE_WRITE_RIGHTS)))
+ goto out;
+ is_suser = TRUE;
+ } else {
+ if (!VATTR_IS_SUPPORTED(vap, va_uid) ||
+ !VATTR_IS_SUPPORTED(vap, va_gid) ||
+ (mp && vfs_extendedsecurity(mp) && !VATTR_IS_SUPPORTED(vap, va_acl))) {
+ panic("vnode attrs not complete for vnode_attr_authorize\n");
+ }
+ }
+
+ result = vnode_attr_authorize_internal(vcp, mp, rights, is_suser,
+ &found_deny, noimmutable, FALSE);
+
+ if (result == EPERM)
+ result = EACCES;
+out:
+ return (result);
+}
+
+
+int
+vnode_authattr_new(vnode_t dvp, struct vnode_attr *vap, int noauth, vfs_context_t ctx)
+{
+ return vnode_authattr_new_internal(dvp, vap, noauth, NULL, ctx);
+}
+
+/*
+ * Check that the attribute information in vattr can be legally applied to
+ * a new file by the context.
+ */
+static int
+vnode_authattr_new_internal(vnode_t dvp, struct vnode_attr *vap, int noauth, uint32_t *defaulted_fieldsp, vfs_context_t ctx)
+{
+ int error;
+ int has_priv_suser, ismember, defaulted_owner, defaulted_group, defaulted_mode;
+ uint32_t inherit_flags;
+ kauth_cred_t cred;
+ guid_t changer;
+ mount_t dmp;
+ struct vnode_attr dva;
+
+ error = 0;
+
+ if (defaulted_fieldsp) {
+ *defaulted_fieldsp = 0;
+ }
+
+ defaulted_owner = defaulted_group = defaulted_mode = 0;
+
+ inherit_flags = 0;
+
+ /*
+ * Require that the filesystem support extended security to apply any.
+ */
+ if (!vfs_extendedsecurity(dvp->v_mount) &&
+ (VATTR_IS_ACTIVE(vap, va_acl) || VATTR_IS_ACTIVE(vap, va_uuuid) || VATTR_IS_ACTIVE(vap, va_guuid))) {
+ error = EINVAL;
+ goto out;
+ }
+
+ /*
+ * Default some fields.
+ */
+ dmp = dvp->v_mount;
+
+ /*
+ * If the filesystem is mounted IGNORE_OWNERSHIP and an explicit owner is set, that
+ * owner takes ownership of all new files.
+ */
+ if ((dmp->mnt_flag & MNT_IGNORE_OWNERSHIP) && (dmp->mnt_fsowner != KAUTH_UID_NONE)) {
+ VATTR_SET(vap, va_uid, dmp->mnt_fsowner);
+ defaulted_owner = 1;
+ } else {
+ if (!VATTR_IS_ACTIVE(vap, va_uid)) {
+ /* default owner is current user */
+ VATTR_SET(vap, va_uid, kauth_cred_getuid(vfs_context_ucred(ctx)));
+ defaulted_owner = 1;
+ }
+ }
+
+ /*
+ * We need the dvp's va_flags and *may* need the gid of the directory,
+ * we ask for both here.
+ */
+ VATTR_INIT(&dva);
+ VATTR_WANTED(&dva, va_gid);
+ VATTR_WANTED(&dva, va_flags);
+ if ((error = vnode_getattr(dvp, &dva, ctx)) != 0)
+ goto out;
+
+ /*
+ * If the filesystem is mounted IGNORE_OWNERSHIP and an explicit grouo is set, that
+ * group takes ownership of all new files.
+ */
+ if ((dmp->mnt_flag & MNT_IGNORE_OWNERSHIP) && (dmp->mnt_fsgroup != KAUTH_GID_NONE)) {
+ VATTR_SET(vap, va_gid, dmp->mnt_fsgroup);
+ defaulted_group = 1;
+ } else {
+ if (!VATTR_IS_ACTIVE(vap, va_gid)) {
+ /* default group comes from parent object, fallback to current user */
+ if (VATTR_IS_SUPPORTED(&dva, va_gid)) {
+ VATTR_SET(vap, va_gid, dva.va_gid);
+ } else {
+ VATTR_SET(vap, va_gid, kauth_cred_getgid(vfs_context_ucred(ctx)));
+ }
+ defaulted_group = 1;
+ }
+ }
+
+ if (!VATTR_IS_ACTIVE(vap, va_flags))
+ VATTR_SET(vap, va_flags, 0);
+
+ /* Determine if SF_RESTRICTED should be inherited from the parent
+ * directory. */
+ if (VATTR_IS_SUPPORTED(&dva, va_flags)) {
+ inherit_flags = dva.va_flags & (UF_DATAVAULT | SF_RESTRICTED);
+ }
+
+ /* default mode is everything, masked with current umask */
+ if (!VATTR_IS_ACTIVE(vap, va_mode)) {
+ VATTR_SET(vap, va_mode, ACCESSPERMS & ~vfs_context_proc(ctx)->p_fd->fd_cmask);
+ KAUTH_DEBUG("ATTR - defaulting new file mode to %o from umask %o", vap->va_mode, vfs_context_proc(ctx)->p_fd->fd_cmask);
+ defaulted_mode = 1;
+ }
+ /* set timestamps to now */
+ if (!VATTR_IS_ACTIVE(vap, va_create_time)) {
+ nanotime(&vap->va_create_time);
+ VATTR_SET_ACTIVE(vap, va_create_time);
+ }
+
+ /*
+ * Check for attempts to set nonsensical fields.
+ */
+ if (vap->va_active & ~VNODE_ATTR_NEWOBJ) {
+ error = EINVAL;
+ KAUTH_DEBUG("ATTR - ERROR - attempt to set unsupported new-file attributes %llx",
+ vap->va_active & ~VNODE_ATTR_NEWOBJ);
+ goto out;
+ }
+
+ /*
+ * Quickly check for the applicability of any enforcement here.
+ * Tests below maintain the integrity of the local security model.
+ */
+ if (vfs_authopaque(dvp->v_mount))
+ goto out;
+
+ /*
+ * We need to know if the caller is the superuser, or if the work is
+ * otherwise already authorised.
+ */
+ cred = vfs_context_ucred(ctx);
+ if (noauth) {
+ /* doing work for the kernel */
+ has_priv_suser = 1;
+ } else {
+ has_priv_suser = vfs_context_issuser(ctx);
+ }
+
+
+ if (VATTR_IS_ACTIVE(vap, va_flags)) {
+ if (has_priv_suser) {
+ if ((vap->va_flags & (UF_SETTABLE | SF_SETTABLE)) != vap->va_flags) {
+ error = EPERM;
+ KAUTH_DEBUG(" DENIED - superuser attempt to set illegal flag(s)");
+ goto out;
+ }
+ } else {
+ if ((vap->va_flags & UF_SETTABLE) != vap->va_flags) {
+ error = EPERM;
+ KAUTH_DEBUG(" DENIED - user attempt to set illegal flag(s)");
+ goto out;
+ }
+ }
+ }
+
+ /* if not superuser, validate legality of new-item attributes */
+ if (!has_priv_suser) {
+ if (!defaulted_mode && VATTR_IS_ACTIVE(vap, va_mode)) {
+ /* setgid? */
+ if (vap->va_mode & S_ISGID) {
+ if ((error = kauth_cred_ismember_gid(cred, vap->va_gid, &ismember)) != 0) {
+ KAUTH_DEBUG("ATTR - ERROR: got %d checking for membership in %d", error, vap->va_gid);
+ goto out;
+ }
+ if (!ismember) {
+ KAUTH_DEBUG(" DENIED - can't set SGID bit, not a member of %d", vap->va_gid);
+ error = EPERM;
+ goto out;
+ }
+ }
+
+ /* setuid? */
+ if ((vap->va_mode & S_ISUID) && (vap->va_uid != kauth_cred_getuid(cred))) {
+ KAUTH_DEBUG("ATTR - ERROR: illegal attempt to set the setuid bit");
+ error = EPERM;
+ goto out;
+ }
+ }
+ if (!defaulted_owner && (vap->va_uid != kauth_cred_getuid(cred))) {
+ KAUTH_DEBUG(" DENIED - cannot create new item owned by %d", vap->va_uid);
+ error = EPERM;
+ goto out;
+ }
+ if (!defaulted_group) {
+ if ((error = kauth_cred_ismember_gid(cred, vap->va_gid, &ismember)) != 0) {
+ KAUTH_DEBUG(" ERROR - got %d checking for membership in %d", error, vap->va_gid);
+ goto out;
+ }
+ if (!ismember) {
+ KAUTH_DEBUG(" DENIED - cannot create new item with group %d - not a member", vap->va_gid);
+ error = EPERM;
+ goto out;
+ }
+ }
+
+ /* initialising owner/group UUID */
+ if (VATTR_IS_ACTIVE(vap, va_uuuid)) {
+ if ((error = kauth_cred_getguid(cred, &changer)) != 0) {
+ KAUTH_DEBUG(" ERROR - got %d trying to get caller UUID", error);
+ /* XXX ENOENT here - no GUID - should perhaps become EPERM */
+ goto out;
+ }
+ if (!kauth_guid_equal(&vap->va_uuuid, &changer)) {
+ KAUTH_DEBUG(" ERROR - cannot create item with supplied owner UUID - not us");
+ error = EPERM;
+ goto out;
+ }
+ }
+ if (VATTR_IS_ACTIVE(vap, va_guuid)) {
+ if ((error = kauth_cred_ismember_guid(cred, &vap->va_guuid, &ismember)) != 0) {
+ KAUTH_DEBUG(" ERROR - got %d trying to check group membership", error);
+ goto out;
+ }
+ if (!ismember) {
+ KAUTH_DEBUG(" ERROR - cannot create item with supplied group UUID - not a member");
+ error = EPERM;
+ goto out;
+ }
+ }
+ }
+out:
+ if (inherit_flags) {
+ /* Apply SF_RESTRICTED to the file if its parent directory was
+ * restricted. This is done at the end so that root is not
+ * required if this flag is only set due to inheritance. */
+ VATTR_SET(vap, va_flags, (vap->va_flags | inherit_flags));
+ }
+ if (defaulted_fieldsp) {
+ if (defaulted_mode) {
+ *defaulted_fieldsp |= VATTR_PREPARE_DEFAULTED_MODE;
+ }
+ if (defaulted_group) {
+ *defaulted_fieldsp |= VATTR_PREPARE_DEFAULTED_GID;
+ }
+ if (defaulted_owner) {
+ *defaulted_fieldsp |= VATTR_PREPARE_DEFAULTED_UID;
+ }
+ }
+ return(error);
+}
+
+/*
+ * Check that the attribute information in vap can be legally written by the
+ * context.
+ *
+ * Call this when you're not sure about the vnode_attr; either its contents
+ * have come from an unknown source, or when they are variable.
+ *
+ * Returns errno, or zero and sets *actionp to the KAUTH_VNODE_* actions that
+ * must be authorized to be permitted to write the vattr.
+ */
+int
+vnode_authattr(vnode_t vp, struct vnode_attr *vap, kauth_action_t *actionp, vfs_context_t ctx)
+{
+ struct vnode_attr ova;
+ kauth_action_t required_action;
+ int error, has_priv_suser, ismember, chowner, chgroup, clear_suid, clear_sgid;
+ guid_t changer;
+ gid_t group;
+ uid_t owner;
+ mode_t newmode;
+ kauth_cred_t cred;
+ uint32_t fdelta;
+
+ VATTR_INIT(&ova);
+ required_action = 0;
+ error = 0;
+
+ /*
+ * Quickly check for enforcement applicability.
+ */
+ if (vfs_authopaque(vp->v_mount))
+ goto out;
+
+ /*
+ * Check for attempts to set nonsensical fields.
+ */
+ if (vap->va_active & VNODE_ATTR_RDONLY) {
+ KAUTH_DEBUG("ATTR - ERROR: attempt to set readonly attribute(s)");
+ error = EINVAL;
+ goto out;
+ }
+
+ /*
+ * We need to know if the caller is the superuser.
+ */
+ cred = vfs_context_ucred(ctx);
+ has_priv_suser = kauth_cred_issuser(cred);
+
+ /*
+ * If any of the following are changing, we need information from the old file:
+ * va_uid
+ * va_gid
+ * va_mode
+ * va_uuuid
+ * va_guuid
+ */
+ if (VATTR_IS_ACTIVE(vap, va_uid) ||
+ VATTR_IS_ACTIVE(vap, va_gid) ||
+ VATTR_IS_ACTIVE(vap, va_mode) ||
+ VATTR_IS_ACTIVE(vap, va_uuuid) ||
+ VATTR_IS_ACTIVE(vap, va_guuid)) {
+ VATTR_WANTED(&ova, va_mode);
+ VATTR_WANTED(&ova, va_uid);
+ VATTR_WANTED(&ova, va_gid);
+ VATTR_WANTED(&ova, va_uuuid);
+ VATTR_WANTED(&ova, va_guuid);
+ KAUTH_DEBUG("ATTR - security information changing, fetching existing attributes");
+ }
+
+ /*
+ * If timestamps are being changed, we need to know who the file is owned
+ * by.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_create_time) ||
+ VATTR_IS_ACTIVE(vap, va_change_time) ||
+ VATTR_IS_ACTIVE(vap, va_modify_time) ||
+ VATTR_IS_ACTIVE(vap, va_access_time) ||
+ VATTR_IS_ACTIVE(vap, va_backup_time) ||
+ VATTR_IS_ACTIVE(vap, va_addedtime)) {
+
+ VATTR_WANTED(&ova, va_uid);
+#if 0 /* enable this when we support UUIDs as official owners */
+ VATTR_WANTED(&ova, va_uuuid);
+#endif
+ KAUTH_DEBUG("ATTR - timestamps changing, fetching uid and GUID");
+ }
+
+ /*
+ * If flags are being changed, we need the old flags.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_flags)) {
+ KAUTH_DEBUG("ATTR - flags changing, fetching old flags");
+ VATTR_WANTED(&ova, va_flags);
+ }
+
+ /*
+ * If ACLs are being changed, we need the old ACLs.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_acl)) {
+ KAUTH_DEBUG("ATTR - acl changing, fetching old flags");
+ VATTR_WANTED(&ova, va_acl);
+ }
+
+ /*
+ * If the size is being set, make sure it's not a directory.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_data_size)) {
+ /* size is only meaningful on regular files, don't permit otherwise */
+ if (!vnode_isreg(vp)) {
+ KAUTH_DEBUG("ATTR - ERROR: size change requested on non-file");
+ error = vnode_isdir(vp) ? EISDIR : EINVAL;
+ goto out;
+ }
+ }
+
+ /*
+ * Get old data.
+ */
+ KAUTH_DEBUG("ATTR - fetching old attributes %016llx", ova.va_active);
+ if ((error = vnode_getattr(vp, &ova, ctx)) != 0) {
+ KAUTH_DEBUG(" ERROR - got %d trying to get attributes", error);
+ goto out;
+ }
+
+ /*
+ * Size changes require write access to the file data.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_data_size)) {
+ /* if we can't get the size, or it's different, we need write access */
+ KAUTH_DEBUG("ATTR - size change, requiring WRITE_DATA");
+ required_action |= KAUTH_VNODE_WRITE_DATA;
+ }
+
+ /*
+ * Changing timestamps?
+ *
+ * Note that we are only called to authorize user-requested time changes;
+ * side-effect time changes are not authorized. Authorisation is only
+ * required for existing files.
+ *
+ * Non-owners are not permitted to change the time on an existing
+ * file to anything other than the current time.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_create_time) ||
+ VATTR_IS_ACTIVE(vap, va_change_time) ||
+ VATTR_IS_ACTIVE(vap, va_modify_time) ||
+ VATTR_IS_ACTIVE(vap, va_access_time) ||
+ VATTR_IS_ACTIVE(vap, va_backup_time) ||
+ VATTR_IS_ACTIVE(vap, va_addedtime)) {
+ /*
+ * The owner and root may set any timestamps they like,
+ * provided that the file is not immutable. The owner still needs
+ * WRITE_ATTRIBUTES (implied by ownership but still deniable).
+ */
+ if (has_priv_suser || vauth_node_owner(&ova, cred)) {
+ KAUTH_DEBUG("ATTR - root or owner changing timestamps");
+ required_action |= KAUTH_VNODE_CHECKIMMUTABLE | KAUTH_VNODE_WRITE_ATTRIBUTES;
+ } else {
+ /* just setting the current time? */
+ if (vap->va_vaflags & VA_UTIMES_NULL) {
+ KAUTH_DEBUG("ATTR - non-root/owner changing timestamps, requiring WRITE_ATTRIBUTES");
+ required_action |= KAUTH_VNODE_WRITE_ATTRIBUTES;
+ } else {
+ KAUTH_DEBUG("ATTR - ERROR: illegal timestamp modification attempted");
+ error = EACCES;
+ goto out;
+ }
+ }
+ }
+
+ /*
+ * Changing file mode?
+ */
+ if (VATTR_IS_ACTIVE(vap, va_mode) && VATTR_IS_SUPPORTED(&ova, va_mode) && (ova.va_mode != vap->va_mode)) {
+ KAUTH_DEBUG("ATTR - mode change from %06o to %06o", ova.va_mode, vap->va_mode);
+
+ /*
+ * Mode changes always have the same basic auth requirements.
+ */
+ if (has_priv_suser) {
+ KAUTH_DEBUG("ATTR - superuser mode change, requiring immutability check");
+ required_action |= KAUTH_VNODE_CHECKIMMUTABLE;
+ } else {
+ /* need WRITE_SECURITY */
+ KAUTH_DEBUG("ATTR - non-superuser mode change, requiring WRITE_SECURITY");
+ required_action |= KAUTH_VNODE_WRITE_SECURITY;
+ }
+
+ /*
+ * Can't set the setgid bit if you're not in the group and not root. Have to have
+ * existing group information in the case we're not setting it right now.
+ */
+ if (vap->va_mode & S_ISGID) {
+ required_action |= KAUTH_VNODE_CHECKIMMUTABLE; /* always required */
+ if (!has_priv_suser) {
+ if (VATTR_IS_ACTIVE(vap, va_gid)) {
+ group = vap->va_gid;
+ } else if (VATTR_IS_SUPPORTED(&ova, va_gid)) {
+ group = ova.va_gid;
+ } else {
+ KAUTH_DEBUG("ATTR - ERROR: setgid but no gid available");
+ error = EINVAL;
+ goto out;
+ }
+ /*
+ * This might be too restrictive; WRITE_SECURITY might be implied by
+ * membership in this case, rather than being an additional requirement.
+ */
+ if ((error = kauth_cred_ismember_gid(cred, group, &ismember)) != 0) {
+ KAUTH_DEBUG("ATTR - ERROR: got %d checking for membership in %d", error, vap->va_gid);
+ goto out;
+ }
+ if (!ismember) {
+ KAUTH_DEBUG(" DENIED - can't set SGID bit, not a member of %d", group);
+ error = EPERM;
+ goto out;
+ }
+ }
+ }
+
+ /*
+ * Can't set the setuid bit unless you're root or the file's owner.
+ */
+ if (vap->va_mode & S_ISUID) {
+ required_action |= KAUTH_VNODE_CHECKIMMUTABLE; /* always required */
+ if (!has_priv_suser) {
+ if (VATTR_IS_ACTIVE(vap, va_uid)) {
+ owner = vap->va_uid;
+ } else if (VATTR_IS_SUPPORTED(&ova, va_uid)) {
+ owner = ova.va_uid;
+ } else {
+ KAUTH_DEBUG("ATTR - ERROR: setuid but no uid available");
+ error = EINVAL;
+ goto out;
+ }
+ if (owner != kauth_cred_getuid(cred)) {
+ /*
+ * We could allow this if WRITE_SECURITY is permitted, perhaps.
+ */
+ KAUTH_DEBUG("ATTR - ERROR: illegal attempt to set the setuid bit");
+ error = EPERM;
+ goto out;
+ }
+ }
+ }
+ }
+
+ /*
+ * Validate/mask flags changes. This checks that only the flags in
+ * the UF_SETTABLE mask are being set, and preserves the flags in
+ * the SF_SETTABLE case.
+ *
+ * Since flags changes may be made in conjunction with other changes,
+ * we will ask the auth code to ignore immutability in the case that
+ * the SF_* flags are not set and we are only manipulating the file flags.
+ *
+ */
+ if (VATTR_IS_ACTIVE(vap, va_flags)) {
+ /* compute changing flags bits */
+ if (VATTR_IS_SUPPORTED(&ova, va_flags)) {
+ fdelta = vap->va_flags ^ ova.va_flags;
+ } else {
+ fdelta = vap->va_flags;
+ }
+
+ if (fdelta != 0) {
+ KAUTH_DEBUG("ATTR - flags changing, requiring WRITE_SECURITY");
+ required_action |= KAUTH_VNODE_WRITE_SECURITY;
+
+ /* check that changing bits are legal */
+ if (has_priv_suser) {
+ /*
+ * The immutability check will prevent us from clearing the SF_*
+ * flags unless the system securelevel permits it, so just check
+ * for legal flags here.
+ */
+ if (fdelta & ~(UF_SETTABLE | SF_SETTABLE)) {
+ error = EPERM;
+ KAUTH_DEBUG(" DENIED - superuser attempt to set illegal flag(s)");
+ goto out;
+ }
+ } else {
+ if (fdelta & ~UF_SETTABLE) {
+ error = EPERM;
+ KAUTH_DEBUG(" DENIED - user attempt to set illegal flag(s)");
+ goto out;
+ }
+ }
+ /*
+ * If the caller has the ability to manipulate file flags,
+ * security is not reduced by ignoring them for this operation.
+ *
* A more complete test here would consider the 'after' states of the flags
* to determine whether it would permit the operation, but this becomes
* very complex.
* Ignoring immutability is conditional on securelevel; this does not bypass
* the SF_* flags if securelevel > 0.
*/
- required_action |= KAUTH_VNODE_NOIMMUTABLE;
+ required_action |= KAUTH_VNODE_NOIMMUTABLE;
+ }
+ }
+
+ /*
+ * Validate ownership information.
+ */
+ chowner = 0;
+ chgroup = 0;
+ clear_suid = 0;
+ clear_sgid = 0;
+
+ /*
+ * uid changing
+ * Note that if the filesystem didn't give us a UID, we expect that it doesn't
+ * support them in general, and will ignore it if/when we try to set it.
+ * We might want to clear the uid out of vap completely here.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_uid)) {
+ if (VATTR_IS_SUPPORTED(&ova, va_uid) && (vap->va_uid != ova.va_uid)) {
+ if (!has_priv_suser && (kauth_cred_getuid(cred) != vap->va_uid)) {
+ KAUTH_DEBUG(" DENIED - non-superuser cannot change ownershipt to a third party");
+ error = EPERM;
+ goto out;
+ }
+ chowner = 1;
+ }
+ clear_suid = 1;
+ }
+
+ /*
+ * gid changing
+ * Note that if the filesystem didn't give us a GID, we expect that it doesn't
+ * support them in general, and will ignore it if/when we try to set it.
+ * We might want to clear the gid out of vap completely here.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_gid)) {
+ if (VATTR_IS_SUPPORTED(&ova, va_gid) && (vap->va_gid != ova.va_gid)) {
+ if (!has_priv_suser) {
+ if ((error = kauth_cred_ismember_gid(cred, vap->va_gid, &ismember)) != 0) {
+ KAUTH_DEBUG(" ERROR - got %d checking for membership in %d", error, vap->va_gid);
+ goto out;
+ }
+ if (!ismember) {
+ KAUTH_DEBUG(" DENIED - group change from %d to %d but not a member of target group",
+ ova.va_gid, vap->va_gid);
+ error = EPERM;
+ goto out;
+ }
+ }
+ chgroup = 1;
+ }
+ clear_sgid = 1;
+ }
+
+ /*
+ * Owner UUID being set or changed.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_uuuid)) {
+ /* if the owner UUID is not actually changing ... */
+ if (VATTR_IS_SUPPORTED(&ova, va_uuuid)) {
+ if (kauth_guid_equal(&vap->va_uuuid, &ova.va_uuuid))
+ goto no_uuuid_change;
+
+ /*
+ * If the current owner UUID is a null GUID, check
+ * it against the UUID corresponding to the owner UID.
+ */
+ if (kauth_guid_equal(&ova.va_uuuid, &kauth_null_guid) &&
+ VATTR_IS_SUPPORTED(&ova, va_uid)) {
+ guid_t uid_guid;
+
+ if (kauth_cred_uid2guid(ova.va_uid, &uid_guid) == 0 &&
+ kauth_guid_equal(&vap->va_uuuid, &uid_guid))
+ goto no_uuuid_change;
+ }
+ }
+
+ /*
+ * The owner UUID cannot be set by a non-superuser to anything other than
+ * their own or a null GUID (to "unset" the owner UUID).
+ * Note that file systems must be prepared to handle the
+ * null UUID case in a manner appropriate for that file
+ * system.
+ */
+ if (!has_priv_suser) {
+ if ((error = kauth_cred_getguid(cred, &changer)) != 0) {
+ KAUTH_DEBUG(" ERROR - got %d trying to get caller UUID", error);
+ /* XXX ENOENT here - no UUID - should perhaps become EPERM */
+ goto out;
+ }
+ if (!kauth_guid_equal(&vap->va_uuuid, &changer) &&
+ !kauth_guid_equal(&vap->va_uuuid, &kauth_null_guid)) {
+ KAUTH_DEBUG(" ERROR - cannot set supplied owner UUID - not us / null");
+ error = EPERM;
+ goto out;
+ }
+ }
+ chowner = 1;
+ clear_suid = 1;
+ }
+no_uuuid_change:
+ /*
+ * Group UUID being set or changed.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_guuid)) {
+ /* if the group UUID is not actually changing ... */
+ if (VATTR_IS_SUPPORTED(&ova, va_guuid)) {
+ if (kauth_guid_equal(&vap->va_guuid, &ova.va_guuid))
+ goto no_guuid_change;
+
+ /*
+ * If the current group UUID is a null UUID, check
+ * it against the UUID corresponding to the group GID.
+ */
+ if (kauth_guid_equal(&ova.va_guuid, &kauth_null_guid) &&
+ VATTR_IS_SUPPORTED(&ova, va_gid)) {
+ guid_t gid_guid;
+
+ if (kauth_cred_gid2guid(ova.va_gid, &gid_guid) == 0 &&
+ kauth_guid_equal(&vap->va_guuid, &gid_guid))
+ goto no_guuid_change;
+ }
+ }
+
+ /*
+ * The group UUID cannot be set by a non-superuser to anything other than
+ * one of which they are a member or a null GUID (to "unset"
+ * the group UUID).
+ * Note that file systems must be prepared to handle the
+ * null UUID case in a manner appropriate for that file
+ * system.
+ */
+ if (!has_priv_suser) {
+ if (kauth_guid_equal(&vap->va_guuid, &kauth_null_guid))
+ ismember = 1;
+ else if ((error = kauth_cred_ismember_guid(cred, &vap->va_guuid, &ismember)) != 0) {
+ KAUTH_DEBUG(" ERROR - got %d trying to check group membership", error);
+ goto out;
+ }
+ if (!ismember) {
+ KAUTH_DEBUG(" ERROR - cannot set supplied group UUID - not a member / null");
+ error = EPERM;
+ goto out;
+ }
+ }
+ chgroup = 1;
+ }
+no_guuid_change:
+
+ /*
+ * Compute authorisation for group/ownership changes.
+ */
+ if (chowner || chgroup || clear_suid || clear_sgid) {
+ if (has_priv_suser) {
+ KAUTH_DEBUG("ATTR - superuser changing file owner/group, requiring immutability check");
+ required_action |= KAUTH_VNODE_CHECKIMMUTABLE;
+ } else {
+ if (chowner) {
+ KAUTH_DEBUG("ATTR - ownership change, requiring TAKE_OWNERSHIP");
+ required_action |= KAUTH_VNODE_TAKE_OWNERSHIP;
+ }
+ if (chgroup && !chowner) {
+ KAUTH_DEBUG("ATTR - group change, requiring WRITE_SECURITY");
+ required_action |= KAUTH_VNODE_WRITE_SECURITY;
+ }
+
+ }
+
+ /*
+ * clear set-uid and set-gid bits. POSIX only requires this for
+ * non-privileged processes but we do it even for root.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_mode)) {
+ newmode = vap->va_mode;
+ } else if (VATTR_IS_SUPPORTED(&ova, va_mode)) {
+ newmode = ova.va_mode;
+ } else {
+ KAUTH_DEBUG("CHOWN - trying to change owner but cannot get mode from filesystem to mask setugid bits");
+ newmode = 0;
+ }
+
+ /* chown always clears setuid/gid bits. An exception is made for
+ * setattrlist executed by a root process to set <uid, gid, mode> on a file:
+ * setattrlist is allowed to set the new mode on the file and change (chown)
+ * uid/gid.
+ */
+ if (newmode & (S_ISUID | S_ISGID)) {
+ if (!VATTR_IS_ACTIVE(vap, va_mode) || !has_priv_suser) {
+ KAUTH_DEBUG("CHOWN - masking setugid bits from mode %o to %o",
+ newmode, newmode & ~(S_ISUID | S_ISGID));
+ newmode &= ~(S_ISUID | S_ISGID);
+ }
+ VATTR_SET(vap, va_mode, newmode);
+ }
+ }
+
+ /*
+ * Authorise changes in the ACL.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_acl)) {
+
+ /* no existing ACL */
+ if (!VATTR_IS_ACTIVE(&ova, va_acl) || (ova.va_acl == NULL)) {
+
+ /* adding an ACL */
+ if (vap->va_acl != NULL) {
+ required_action |= KAUTH_VNODE_WRITE_SECURITY;
+ KAUTH_DEBUG("CHMOD - adding ACL");
+ }
+
+ /* removing an existing ACL */
+ } else if (vap->va_acl == NULL) {
+ required_action |= KAUTH_VNODE_WRITE_SECURITY;
+ KAUTH_DEBUG("CHMOD - removing ACL");
+
+ /* updating an existing ACL */
+ } else {
+ if (vap->va_acl->acl_entrycount != ova.va_acl->acl_entrycount) {
+ /* entry count changed, must be different */
+ required_action |= KAUTH_VNODE_WRITE_SECURITY;
+ KAUTH_DEBUG("CHMOD - adding/removing ACL entries");
+ } else if (vap->va_acl->acl_entrycount > 0) {
+ /* both ACLs have the same ACE count, said count is 1 or more, bitwise compare ACLs */
+ if (memcmp(&vap->va_acl->acl_ace[0], &ova.va_acl->acl_ace[0],
+ sizeof(struct kauth_ace) * vap->va_acl->acl_entrycount)) {
+ required_action |= KAUTH_VNODE_WRITE_SECURITY;
+ KAUTH_DEBUG("CHMOD - changing ACL entries");
+ }
+ }
+ }
+ }
+
+ /*
+ * Other attributes that require authorisation.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_encoding))
+ required_action |= KAUTH_VNODE_WRITE_ATTRIBUTES;
+
+out:
+ if (VATTR_IS_SUPPORTED(&ova, va_acl) && (ova.va_acl != NULL))
+ kauth_acl_free(ova.va_acl);
+ if (error == 0)
+ *actionp = required_action;
+ return(error);
+}
+
+static int
+setlocklocal_callback(struct vnode *vp, __unused void *cargs)
+{
+ vnode_lock_spin(vp);
+ vp->v_flag |= VLOCKLOCAL;
+ vnode_unlock(vp);
+
+ return (VNODE_RETURNED);
+}
+
+void
+vfs_setlocklocal(mount_t mp)
+{
+ mount_lock_spin(mp);
+ mp->mnt_kern_flag |= MNTK_LOCK_LOCAL;
+ mount_unlock(mp);
+
+ /*
+ * The number of active vnodes is expected to be
+ * very small when vfs_setlocklocal is invoked.
+ */
+ vnode_iterate(mp, 0, setlocklocal_callback, NULL);
+}
+
+void
+vfs_setcompoundopen(mount_t mp)
+{
+ mount_lock_spin(mp);
+ mp->mnt_compound_ops |= COMPOUND_VNOP_OPEN;
+ mount_unlock(mp);
+}
+
+
+void
+vnode_setswapmount(vnode_t vp)
+{
+ mount_lock(vp->v_mount);
+ vp->v_mount->mnt_kern_flag |= MNTK_SWAP_MOUNT;
+ mount_unlock(vp->v_mount);
+}
+
+
+int64_t
+vnode_getswappin_avail(vnode_t vp)
+{
+ int64_t max_swappin_avail = 0;
+
+ mount_lock(vp->v_mount);
+ if (vp->v_mount->mnt_ioflags & MNT_IOFLAGS_SWAPPIN_SUPPORTED)
+ max_swappin_avail = vp->v_mount->mnt_max_swappin_available;
+ mount_unlock(vp->v_mount);
+
+ return (max_swappin_avail);
+}
+
+
+void
+vn_setunionwait(vnode_t vp)
+{
+ vnode_lock_spin(vp);
+ vp->v_flag |= VISUNION;
+ vnode_unlock(vp);
+}
+
+
+void
+vn_checkunionwait(vnode_t vp)
+{
+ vnode_lock_spin(vp);
+ while ((vp->v_flag & VISUNION) == VISUNION)
+ msleep((caddr_t)&vp->v_flag, &vp->v_lock, 0, 0, 0);
+ vnode_unlock(vp);
+}
+
+void
+vn_clearunionwait(vnode_t vp, int locked)
+{
+ if (!locked)
+ vnode_lock_spin(vp);
+ if((vp->v_flag & VISUNION) == VISUNION) {
+ vp->v_flag &= ~VISUNION;
+ wakeup((caddr_t)&vp->v_flag);
+ }
+ if (!locked)
+ vnode_unlock(vp);
+}
+
+/*
+ * Removes orphaned apple double files during a rmdir
+ * Works by:
+ * 1. vnode_suspend().
+ * 2. Call VNOP_READDIR() till the end of directory is reached.
+ * 3. Check if the directory entries returned are regular files with name starting with "._". If not, return ENOTEMPTY.
+ * 4. Continue (2) and (3) till end of directory is reached.
+ * 5. If all the entries in the directory were files with "._" name, delete all the files.
+ * 6. vnode_resume()
+ * 7. If deletion of all files succeeded, call VNOP_RMDIR() again.
+ */
+
+errno_t rmdir_remove_orphaned_appleDouble(vnode_t vp , vfs_context_t ctx, int * restart_flag)
+{
+
+#define UIO_BUFF_SIZE 2048
+ uio_t auio = NULL;
+ int eofflag, siz = UIO_BUFF_SIZE, nentries = 0;
+ int open_flag = 0, full_erase_flag = 0;
+ char uio_buf[ UIO_SIZEOF(1) ];
+ char *rbuf = NULL;
+ void *dir_pos;
+ void *dir_end;
+ struct dirent *dp;
+ errno_t error;
+
+ error = vnode_suspend(vp);
+
+ /*
+ * restart_flag is set so that the calling rmdir sleeps and resets
+ */
+ if (error == EBUSY)
+ *restart_flag = 1;
+ if (error != 0)
+ return (error);
+
+ /*
+ * set up UIO
+ */
+ MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
+ if (rbuf)
+ auio = uio_createwithbuffer(1, 0, UIO_SYSSPACE, UIO_READ,
+ &uio_buf[0], sizeof(uio_buf));
+ if (!rbuf || !auio) {
+ error = ENOMEM;
+ goto outsc;
+ }
+
+ uio_setoffset(auio,0);
+
+ eofflag = 0;
+
+ if ((error = VNOP_OPEN(vp, FREAD, ctx)))
+ goto outsc;
+ else
+ open_flag = 1;
+
+ /*
+ * First pass checks if all files are appleDouble files.
+ */
+
+ do {
+ siz = UIO_BUFF_SIZE;
+ uio_reset(auio, uio_offset(auio), UIO_SYSSPACE, UIO_READ);
+ uio_addiov(auio, CAST_USER_ADDR_T(rbuf), UIO_BUFF_SIZE);
+
+ if((error = VNOP_READDIR(vp, auio, 0, &eofflag, &nentries, ctx)))
+ goto outsc;
+
+ if (uio_resid(auio) != 0)
+ siz -= uio_resid(auio);
+
+ /*
+ * Iterate through directory
+ */
+ dir_pos = (void*) rbuf;
+ dir_end = (void*) (rbuf + siz);
+ dp = (struct dirent*) (dir_pos);
+
+ if (dir_pos == dir_end)
+ eofflag = 1;
+
+ while (dir_pos < dir_end) {
+ /*
+ * Check for . and .. as well as directories
+ */
+ if (dp->d_ino != 0 &&
+ !((dp->d_namlen == 1 && dp->d_name[0] == '.') ||
+ (dp->d_namlen == 2 && dp->d_name[0] == '.' && dp->d_name[1] == '.'))) {
+ /*
+ * Check for irregular files and ._ files
+ * If there is a ._._ file abort the op
+ */
+ if ( dp->d_namlen < 2 ||
+ strncmp(dp->d_name,"._",2) ||
+ (dp->d_namlen >= 4 && !strncmp(&(dp->d_name[2]), "._",2))) {
+ error = ENOTEMPTY;
+ goto outsc;
+ }
+ }
+ dir_pos = (void*) ((uint8_t*)dir_pos + dp->d_reclen);
+ dp = (struct dirent*)dir_pos;
+ }
+
+ /*
+ * workaround for HFS/NFS setting eofflag before end of file
+ */
+ if (vp->v_tag == VT_HFS && nentries > 2)
+ eofflag=0;
+
+ if (vp->v_tag == VT_NFS) {
+ if (eofflag && !full_erase_flag) {
+ full_erase_flag = 1;
+ eofflag = 0;
+ uio_reset(auio, 0, UIO_SYSSPACE, UIO_READ);
+ }
+ else if (!eofflag && full_erase_flag)
+ full_erase_flag = 0;
+ }
+
+ } while (!eofflag);
+ /*
+ * If we've made it here all the files in the dir are ._ files.
+ * We can delete the files even though the node is suspended
+ * because we are the owner of the file.
+ */
+
+ uio_reset(auio, 0, UIO_SYSSPACE, UIO_READ);
+ eofflag = 0;
+ full_erase_flag = 0;
+
+ do {
+ siz = UIO_BUFF_SIZE;
+ uio_reset(auio, uio_offset(auio), UIO_SYSSPACE, UIO_READ);
+ uio_addiov(auio, CAST_USER_ADDR_T(rbuf), UIO_BUFF_SIZE);
+
+ error = VNOP_READDIR(vp, auio, 0, &eofflag, &nentries, ctx);
+
+ if (error != 0)
+ goto outsc;
+
+ if (uio_resid(auio) != 0)
+ siz -= uio_resid(auio);
+
+ /*
+ * Iterate through directory
+ */
+ dir_pos = (void*) rbuf;
+ dir_end = (void*) (rbuf + siz);
+ dp = (struct dirent*) dir_pos;
+
+ if (dir_pos == dir_end)
+ eofflag = 1;
+
+ while (dir_pos < dir_end) {
+ /*
+ * Check for . and .. as well as directories
+ */
+ if (dp->d_ino != 0 &&
+ !((dp->d_namlen == 1 && dp->d_name[0] == '.') ||
+ (dp->d_namlen == 2 && dp->d_name[0] == '.' && dp->d_name[1] == '.'))
+ ) {
+
+ error = unlink1(ctx, vp,
+ CAST_USER_ADDR_T(dp->d_name), UIO_SYSSPACE,
+ VNODE_REMOVE_SKIP_NAMESPACE_EVENT |
+ VNODE_REMOVE_NO_AUDIT_PATH);
+
+ if (error && error != ENOENT) {
+ goto outsc;
+ }
+
+ }
+ dir_pos = (void*) ((uint8_t*)dir_pos + dp->d_reclen);
+ dp = (struct dirent*)dir_pos;
+ }
+
+ /*
+ * workaround for HFS/NFS setting eofflag before end of file
+ */
+ if (vp->v_tag == VT_HFS && nentries > 2)
+ eofflag=0;
+
+ if (vp->v_tag == VT_NFS) {
+ if (eofflag && !full_erase_flag) {
+ full_erase_flag = 1;
+ eofflag = 0;
+ uio_reset(auio, 0, UIO_SYSSPACE, UIO_READ);
+ }
+ else if (!eofflag && full_erase_flag)
+ full_erase_flag = 0;
+ }
+
+ } while (!eofflag);
+
+
+ error = 0;
+
+outsc:
+ if (open_flag)
+ VNOP_CLOSE(vp, FREAD, ctx);
+
+ if (auio)
+ uio_free(auio);
+ FREE(rbuf, M_TEMP);
+
+ vnode_resume(vp);
+
+
+ return(error);
+
+}
+
+
+void
+lock_vnode_and_post(vnode_t vp, int kevent_num)
+{
+ /* Only take the lock if there's something there! */
+ if (vp->v_knotes.slh_first != NULL) {
+ vnode_lock(vp);
+ KNOTE(&vp->v_knotes, kevent_num);
+ vnode_unlock(vp);
+ }
+}
+
+void panic_print_vnodes(void);
+
+/* define PANIC_PRINTS_VNODES only if investigation is required. */
+#ifdef PANIC_PRINTS_VNODES
+
+static const char *__vtype(uint16_t vtype)
+{
+ switch (vtype) {
+ case VREG:
+ return "R";
+ case VDIR:
+ return "D";
+ case VBLK:
+ return "B";
+ case VCHR:
+ return "C";
+ case VLNK:
+ return "L";
+ case VSOCK:
+ return "S";
+ case VFIFO:
+ return "F";
+ case VBAD:
+ return "x";
+ case VSTR:
+ return "T";
+ case VCPLX:
+ return "X";
+ default:
+ return "?";
+ }
+}
+
+/*
+ * build a path from the bottom up
+ * NOTE: called from the panic path - no alloc'ing of memory and no locks!
+ */
+static char *__vpath(vnode_t vp, char *str, int len, int depth)
+{
+ int vnm_len;
+ const char *src;
+ char *dst;
+
+ if (len <= 0)
+ return str;
+ /* str + len is the start of the string we created */
+ if (!vp->v_name)
+ return str + len;
+
+ /* follow mount vnodes to get the full path */
+ if ((vp->v_flag & VROOT)) {
+ if (vp->v_mount != NULL && vp->v_mount->mnt_vnodecovered) {
+ return __vpath(vp->v_mount->mnt_vnodecovered,
+ str, len, depth+1);
+ }
+ return str + len;
+ }
+
+ src = vp->v_name;
+ vnm_len = strlen(src);
+ if (vnm_len > len) {
+ /* truncate the name to fit in the string */
+ src += (vnm_len - len);
+ vnm_len = len;
+ }
+
+ /* start from the back and copy just characters (no NULLs) */
+
+ /* this will chop off leaf path (file) names */
+ if (depth > 0) {
+ dst = str + len - vnm_len;
+ memcpy(dst, src, vnm_len);
+ len -= vnm_len;
+ } else {
+ dst = str + len;
+ }
+
+ if (vp->v_parent && len > 1) {
+ /* follow parents up the chain */
+ len--;
+ *(dst-1) = '/';
+ return __vpath(vp->v_parent, str, len, depth + 1);
+ }
+
+ return dst;
+}
+
+#define SANE_VNODE_PRINT_LIMIT 5000
+void panic_print_vnodes(void)
+{
+ mount_t mnt;
+ vnode_t vp;
+ int nvnodes = 0;
+ const char *type;
+ char *nm;
+ char vname[257];
+
+ paniclog_append_noflush("\n***** VNODES *****\n"
+ "TYPE UREF ICNT PATH\n");
+
+ /* NULL-terminate the path name */
+ vname[sizeof(vname)-1] = '\0';
+
+ /*
+ * iterate all vnodelist items in all mounts (mntlist) -> mnt_vnodelist
+ */
+ TAILQ_FOREACH(mnt, &mountlist, mnt_list) {
+
+ if (!ml_validate_nofault((vm_offset_t)mnt, sizeof(mount_t))) {
+ paniclog_append_noflush("Unable to iterate the mount list %p - encountered an invalid mount pointer %p \n",
+ &mountlist, mnt);
+ break;
+ }
+
+ TAILQ_FOREACH(vp, &mnt->mnt_vnodelist, v_mntvnodes) {
+
+ if (!ml_validate_nofault((vm_offset_t)vp, sizeof(vnode_t))) {
+ paniclog_append_noflush("Unable to iterate the vnode list %p - encountered an invalid vnode pointer %p \n",
+ &mnt->mnt_vnodelist, vp);
+ break;
+ }
+
+ if (++nvnodes > SANE_VNODE_PRINT_LIMIT)
+ return;
+ type = __vtype(vp->v_type);
+ nm = __vpath(vp, vname, sizeof(vname)-1, 0);
+ paniclog_append_noflush("%s %0d %0d %s\n",
+ type, vp->v_usecount, vp->v_iocount, nm);
+ }
+ }
+}
+
+#else /* !PANIC_PRINTS_VNODES */
+void panic_print_vnodes(void)
+{
+ return;
+}
+#endif
+
+
+#ifdef JOE_DEBUG
+static void record_vp(vnode_t vp, int count) {
+ struct uthread *ut;
+
+#if CONFIG_TRIGGERS
+ if (vp->v_resolve)
+ return;
+#endif
+ if ((vp->v_flag & VSYSTEM))
+ return;
+
+ ut = get_bsdthread_info(current_thread());
+ ut->uu_iocount += count;
+
+ if (count == 1) {
+ if (ut->uu_vpindex < 32) {
+ OSBacktrace((void **)&ut->uu_pcs[ut->uu_vpindex][0], 10);
+
+ ut->uu_vps[ut->uu_vpindex] = vp;
+ ut->uu_vpindex++;
+ }
+ }
+}
+#endif
+
+
+#if CONFIG_TRIGGERS
+
+#define TRIG_DEBUG 0
+
+#if TRIG_DEBUG
+#define TRIG_LOG(...) do { printf("%s: ", __FUNCTION__); printf(__VA_ARGS__); } while (0)
+#else
+#define TRIG_LOG(...)
+#endif
+
+/*
+ * Resolver result functions
+ */
+
+resolver_result_t
+vfs_resolver_result(uint32_t seq, enum resolver_status stat, int aux)
+{
+ /*
+ * |<--- 32 --->|<--- 28 --->|<- 4 ->|
+ * sequence auxiliary status
+ */
+ return (((uint64_t)seq) << 32) |
+ (((uint64_t)(aux & 0x0fffffff)) << 4) |
+ (uint64_t)(stat & 0x0000000F);
+}
+
+enum resolver_status
+vfs_resolver_status(resolver_result_t result)
+{
+ /* lower 4 bits is status */
+ return (result & 0x0000000F);
+}
+
+uint32_t
+vfs_resolver_sequence(resolver_result_t result)
+{
+ /* upper 32 bits is sequence */
+ return (uint32_t)(result >> 32);
+}
+
+int
+vfs_resolver_auxiliary(resolver_result_t result)
+{
+ /* 28 bits of auxiliary */
+ return (int)(((uint32_t)(result & 0xFFFFFFF0)) >> 4);
+}
+
+/*
+ * SPI
+ * Call in for resolvers to update vnode trigger state
+ */
+int
+vnode_trigger_update(vnode_t vp, resolver_result_t result)
+{
+ vnode_resolve_t rp;
+ uint32_t seq;
+ enum resolver_status stat;
+
+ if (vp->v_resolve == NULL) {
+ return (EINVAL);
+ }
+
+ stat = vfs_resolver_status(result);
+ seq = vfs_resolver_sequence(result);
+
+ if ((stat != RESOLVER_RESOLVED) && (stat != RESOLVER_UNRESOLVED)) {
+ return (EINVAL);
+ }
+
+ rp = vp->v_resolve;
+ lck_mtx_lock(&rp->vr_lock);
+
+ if (seq > rp->vr_lastseq) {
+ if (stat == RESOLVER_RESOLVED)
+ rp->vr_flags |= VNT_RESOLVED;
+ else
+ rp->vr_flags &= ~VNT_RESOLVED;
+
+ rp->vr_lastseq = seq;
+ }
+
+ lck_mtx_unlock(&rp->vr_lock);
+
+ return (0);
+}
+
+static int
+vnode_resolver_attach(vnode_t vp, vnode_resolve_t rp, boolean_t ref)
+{
+ int error;
+
+ vnode_lock_spin(vp);
+ if (vp->v_resolve != NULL) {
+ vnode_unlock(vp);
+ return EINVAL;
+ } else {
+ vp->v_resolve = rp;
+ }
+ vnode_unlock(vp);
+
+ if (ref) {
+ error = vnode_ref_ext(vp, O_EVTONLY, VNODE_REF_FORCE);
+ if (error != 0) {
+ panic("VNODE_REF_FORCE didn't help...");
}
}
+ return 0;
+}
+
+/*
+ * VFS internal interfaces for vnode triggers
+ *
+ * vnode must already have an io count on entry
+ * v_resolve is stable when io count is non-zero
+ */
+static int
+vnode_resolver_create(mount_t mp, vnode_t vp, struct vnode_trigger_param *tinfo, boolean_t external)
+{
+ vnode_resolve_t rp;
+ int result;
+ char byte;
+
+#if 1
+ /* minimum pointer test (debugging) */
+ if (tinfo->vnt_data)
+ byte = *((char *)tinfo->vnt_data);
+#endif
+ MALLOC(rp, vnode_resolve_t, sizeof(*rp), M_TEMP, M_WAITOK);
+ if (rp == NULL)
+ return (ENOMEM);
+
+ lck_mtx_init(&rp->vr_lock, trigger_vnode_lck_grp, trigger_vnode_lck_attr);
+
+ rp->vr_resolve_func = tinfo->vnt_resolve_func;
+ rp->vr_unresolve_func = tinfo->vnt_unresolve_func;
+ rp->vr_rearm_func = tinfo->vnt_rearm_func;
+ rp->vr_reclaim_func = tinfo->vnt_reclaim_func;
+ rp->vr_data = tinfo->vnt_data;
+ rp->vr_lastseq = 0;
+ rp->vr_flags = tinfo->vnt_flags & VNT_VALID_MASK;
+ if (external) {
+ rp->vr_flags |= VNT_EXTERNAL;
+ }
+
+ result = vnode_resolver_attach(vp, rp, external);
+ if (result != 0) {
+ goto out;
+ }
+
+ if (mp) {
+ OSAddAtomic(1, &mp->mnt_numtriggers);
+ }
+
+ return (result);
+
+out:
+ FREE(rp, M_TEMP);
+ return result;
+}
+
+static void
+vnode_resolver_release(vnode_resolve_t rp)
+{
+ /*
+ * Give them a chance to free any private data
+ */
+ if (rp->vr_data && rp->vr_reclaim_func) {
+ rp->vr_reclaim_func(NULLVP, rp->vr_data);
+ }
+
+ lck_mtx_destroy(&rp->vr_lock, trigger_vnode_lck_grp);
+ FREE(rp, M_TEMP);
+
+}
+
+/* Called after the vnode has been drained */
+static void
+vnode_resolver_detach(vnode_t vp)
+{
+ vnode_resolve_t rp;
+ mount_t mp;
+
+ mp = vnode_mount(vp);
+
+ vnode_lock(vp);
+ rp = vp->v_resolve;
+ vp->v_resolve = NULL;
+ vnode_unlock(vp);
+
+ if ((rp->vr_flags & VNT_EXTERNAL) != 0) {
+ vnode_rele_ext(vp, O_EVTONLY, 1);
+ }
+
+ vnode_resolver_release(rp);
+
+ /* Keep count of active trigger vnodes per mount */
+ OSAddAtomic(-1, &mp->mnt_numtriggers);
+}
+
+__private_extern__
+void
+vnode_trigger_rearm(vnode_t vp, vfs_context_t ctx)
+{
+ vnode_resolve_t rp;
+ resolver_result_t result;
+ enum resolver_status status;
+ uint32_t seq;
+
+ if ((vp->v_resolve == NULL) ||
+ (vp->v_resolve->vr_rearm_func == NULL) ||
+ (vp->v_resolve->vr_flags & VNT_AUTO_REARM) == 0) {
+ return;
+ }
+
+ rp = vp->v_resolve;
+ lck_mtx_lock(&rp->vr_lock);
+
+ /*
+ * Check if VFS initiated this unmount. If so, we'll catch it after the unresolve completes.
+ */
+ if (rp->vr_flags & VNT_VFS_UNMOUNTED) {
+ lck_mtx_unlock(&rp->vr_lock);
+ return;
+ }
+
+ /* Check if this vnode is already armed */
+ if ((rp->vr_flags & VNT_RESOLVED) == 0) {
+ lck_mtx_unlock(&rp->vr_lock);
+ return;
+ }
+
+ lck_mtx_unlock(&rp->vr_lock);
+
+ result = rp->vr_rearm_func(vp, 0, rp->vr_data, ctx);
+ status = vfs_resolver_status(result);
+ seq = vfs_resolver_sequence(result);
+
+ lck_mtx_lock(&rp->vr_lock);
+ if (seq > rp->vr_lastseq) {
+ if (status == RESOLVER_UNRESOLVED)
+ rp->vr_flags &= ~VNT_RESOLVED;
+ rp->vr_lastseq = seq;
+ }
+ lck_mtx_unlock(&rp->vr_lock);
+}
+
+__private_extern__
+int
+vnode_trigger_resolve(vnode_t vp, struct nameidata *ndp, vfs_context_t ctx)
+{
+ vnode_resolve_t rp;
+ enum path_operation op;
+ resolver_result_t result;
+ enum resolver_status status;
+ uint32_t seq;
+
+ /* Only trigger on topmost vnodes */
+ if ((vp->v_resolve == NULL) ||
+ (vp->v_resolve->vr_resolve_func == NULL) ||
+ (vp->v_mountedhere != NULL)) {
+ return (0);
+ }
+
+ rp = vp->v_resolve;
+ lck_mtx_lock(&rp->vr_lock);
+
+ /* Check if this vnode is already resolved */
+ if (rp->vr_flags & VNT_RESOLVED) {
+ lck_mtx_unlock(&rp->vr_lock);
+ return (0);
+ }
+
+ lck_mtx_unlock(&rp->vr_lock);
+
+ /*
+ * XXX
+ * assumes that resolver will not access this trigger vnode (otherwise the kernel will deadlock)
+ * is there anyway to know this???
+ * there can also be other legitimate lookups in parallel
+ *
+ * XXX - should we call this on a separate thread with a timeout?
+ *
+ * XXX - should we use ISLASTCN to pick the op value??? Perhaps only leafs should
+ * get the richer set and non-leafs should get generic OP_LOOKUP? TBD
+ */
+ op = (ndp->ni_op < OP_MAXOP) ? ndp->ni_op: OP_LOOKUP;
+
+ result = rp->vr_resolve_func(vp, &ndp->ni_cnd, op, 0, rp->vr_data, ctx);
+ status = vfs_resolver_status(result);
+ seq = vfs_resolver_sequence(result);
+
+ lck_mtx_lock(&rp->vr_lock);
+ if (seq > rp->vr_lastseq) {
+ if (status == RESOLVER_RESOLVED)
+ rp->vr_flags |= VNT_RESOLVED;
+ rp->vr_lastseq = seq;
+ }
+ lck_mtx_unlock(&rp->vr_lock);
+
+ /* On resolver errors, propagate the error back up */
+ return (status == RESOLVER_ERROR ? vfs_resolver_auxiliary(result) : 0);
+}
+
+static int
+vnode_trigger_unresolve(vnode_t vp, int flags, vfs_context_t ctx)
+{
+ vnode_resolve_t rp;
+ resolver_result_t result;
+ enum resolver_status status;
+ uint32_t seq;
+
+ if ((vp->v_resolve == NULL) || (vp->v_resolve->vr_unresolve_func == NULL)) {
+ return (0);
+ }
+
+ rp = vp->v_resolve;
+ lck_mtx_lock(&rp->vr_lock);
+
+ /* Check if this vnode is already resolved */
+ if ((rp->vr_flags & VNT_RESOLVED) == 0) {
+ printf("vnode_trigger_unresolve: not currently resolved\n");
+ lck_mtx_unlock(&rp->vr_lock);
+ return (0);
+ }
+
+ rp->vr_flags |= VNT_VFS_UNMOUNTED;
+
+ lck_mtx_unlock(&rp->vr_lock);
+
/*
- * Validate ownership information.
+ * XXX
+ * assumes that resolver will not access this trigger vnode (otherwise the kernel will deadlock)
+ * there can also be other legitimate lookups in parallel
+ *
+ * XXX - should we call this on a separate thread with a timeout?
*/
- chowner = 0;
- chgroup = 0;
+
+ result = rp->vr_unresolve_func(vp, flags, rp->vr_data, ctx);
+ status = vfs_resolver_status(result);
+ seq = vfs_resolver_sequence(result);
+
+ lck_mtx_lock(&rp->vr_lock);
+ if (seq > rp->vr_lastseq) {
+ if (status == RESOLVER_UNRESOLVED)
+ rp->vr_flags &= ~VNT_RESOLVED;
+ rp->vr_lastseq = seq;
+ }
+ rp->vr_flags &= ~VNT_VFS_UNMOUNTED;
+ lck_mtx_unlock(&rp->vr_lock);
+
+ /* On resolver errors, propagate the error back up */
+ return (status == RESOLVER_ERROR ? vfs_resolver_auxiliary(result) : 0);
+}
+
+static int
+triggerisdescendant(mount_t mp, mount_t rmp)
+{
+ int match = FALSE;
/*
- * uid changing
- * Note that if the filesystem didn't give us a UID, we expect that it doesn't
- * support them in general, and will ignore it if/when we try to set it.
- * We might want to clear the uid out of vap completely here.
+ * walk up vnode covered chain looking for a match
*/
- if (VATTR_IS_ACTIVE(vap, va_uid) && VATTR_IS_SUPPORTED(&ova, va_uid) && (vap->va_uid != ova.va_uid)) {
- if (!is_suser && (kauth_cred_getuid(cred) != vap->va_uid)) {
- KAUTH_DEBUG(" DENIED - non-superuser cannot change ownershipt to a third party");
- error = EPERM;
- goto out;
+ name_cache_lock_shared();
+
+ while (1) {
+ vnode_t vp;
+
+ /* did we encounter "/" ? */
+ if (mp->mnt_flag & MNT_ROOTFS)
+ break;
+
+ vp = mp->mnt_vnodecovered;
+ if (vp == NULLVP)
+ break;
+
+ mp = vp->v_mount;
+ if (mp == rmp) {
+ match = TRUE;
+ break;
}
- chowner = 1;
}
-
+
+ name_cache_unlock();
+
+ return (match);
+}
+
+struct trigger_unmount_info {
+ vfs_context_t ctx;
+ mount_t top_mp;
+ vnode_t trigger_vp;
+ mount_t trigger_mp;
+ uint32_t trigger_vid;
+ int flags;
+};
+
+static int
+trigger_unmount_callback(mount_t mp, void * arg)
+{
+ struct trigger_unmount_info * infop = (struct trigger_unmount_info *)arg;
+ boolean_t mountedtrigger = FALSE;
+
/*
- * gid changing
- * Note that if the filesystem didn't give us a GID, we expect that it doesn't
- * support them in general, and will ignore it if/when we try to set it.
- * We might want to clear the gid out of vap completely here.
+ * When we encounter the top level mount we're done
*/
- if (VATTR_IS_ACTIVE(vap, va_gid) && VATTR_IS_SUPPORTED(&ova, va_gid) && (vap->va_gid != ova.va_gid)) {
- if (!is_suser) {
- if ((error = kauth_cred_ismember_gid(cred, vap->va_gid, &ismember)) != 0) {
- KAUTH_DEBUG(" ERROR - got %d checking for membership in %d", error, vap->va_gid);
- goto out;
- }
- if (!ismember) {
- KAUTH_DEBUG(" DENIED - group change from %d to %d but not a member of target group",
- ova.va_gid, vap->va_gid);
- error = EPERM;
- goto out;
- }
- }
- chgroup = 1;
+ if (mp == infop->top_mp)
+ return (VFS_RETURNED_DONE);
+
+ if ((mp->mnt_vnodecovered == NULL) ||
+ (vnode_getwithref(mp->mnt_vnodecovered) != 0)) {
+ return (VFS_RETURNED);
+ }
+
+ if ((mp->mnt_vnodecovered->v_mountedhere == mp) &&
+ (mp->mnt_vnodecovered->v_resolve != NULL) &&
+ (mp->mnt_vnodecovered->v_resolve->vr_flags & VNT_RESOLVED)) {
+ mountedtrigger = TRUE;
}
+ vnode_put(mp->mnt_vnodecovered);
/*
- * Owner UUID being set or changed.
+ * When we encounter a mounted trigger, check if its under the top level mount
*/
- if (VATTR_IS_ACTIVE(vap, va_uuuid)) {
- /* if the owner UUID is not actually changing ... */
- if (VATTR_IS_SUPPORTED(&ova, va_uuuid) && kauth_guid_equal(&vap->va_uuuid, &ova.va_uuuid))
- goto no_uuuid_change;
+ if ( !mountedtrigger || !triggerisdescendant(mp, infop->top_mp) )
+ return (VFS_RETURNED);
+
+ /*
+ * Process any pending nested mount (now that its not referenced)
+ */
+ if ((infop->trigger_vp != NULLVP) &&
+ (vnode_getwithvid(infop->trigger_vp, infop->trigger_vid) == 0)) {
+ vnode_t vp = infop->trigger_vp;
+ int error;
+
+ infop->trigger_vp = NULLVP;
- /*
- * The owner UUID cannot be set by a non-superuser to anything other than
- * their own.
- */
- if (!is_suser) {
- if ((error = kauth_cred_getguid(cred, &changer)) != 0) {
- KAUTH_DEBUG(" ERROR - got %d trying to get caller UUID", error);
- /* XXX ENOENT here - no UUID - should perhaps become EPERM */
- goto out;
- }
- if (!kauth_guid_equal(&vap->va_uuuid, &changer)) {
- KAUTH_DEBUG(" ERROR - cannot set supplied owner UUID - not us");
- error = EPERM;
- goto out;
- }
+ if (mp == vp->v_mountedhere) {
+ vnode_put(vp);
+ printf("trigger_unmount_callback: unexpected match '%s'\n",
+ mp->mnt_vfsstat.f_mntonname);
+ return (VFS_RETURNED);
+ }
+ if (infop->trigger_mp != vp->v_mountedhere) {
+ vnode_put(vp);
+ printf("trigger_unmount_callback: trigger mnt changed! (%p != %p)\n",
+ infop->trigger_mp, vp->v_mountedhere);
+ goto savenext;
+ }
+
+ error = vnode_trigger_unresolve(vp, infop->flags, infop->ctx);
+ vnode_put(vp);
+ if (error) {
+ printf("unresolving: '%s', err %d\n",
+ vp->v_mountedhere ? vp->v_mountedhere->mnt_vfsstat.f_mntonname :
+ "???", error);
+ return (VFS_RETURNED_DONE); /* stop iteration on errors */
}
- chowner = 1;
}
-no_uuuid_change:
+savenext:
/*
- * Group UUID being set or changed.
+ * We can't call resolver here since we hold a mount iter
+ * ref on mp so save its covered vp for later processing
*/
- if (VATTR_IS_ACTIVE(vap, va_guuid)) {
- /* if the group UUID is not actually changing ... */
- if (VATTR_IS_SUPPORTED(&ova, va_guuid) && kauth_guid_equal(&vap->va_guuid, &ova.va_guuid))
- goto no_guuid_change;
+ infop->trigger_vp = mp->mnt_vnodecovered;
+ if ((infop->trigger_vp != NULLVP) &&
+ (vnode_getwithref(infop->trigger_vp) == 0)) {
+ if (infop->trigger_vp->v_mountedhere == mp) {
+ infop->trigger_vid = infop->trigger_vp->v_id;
+ infop->trigger_mp = mp;
+ }
+ vnode_put(infop->trigger_vp);
+ }
- /*
- * The group UUID cannot be set by a non-superuser to anything other than
- * one of which they are a member.
- */
- if (!is_suser) {
- if ((error = kauth_cred_ismember_guid(cred, &vap->va_guuid, &ismember)) != 0) {
- KAUTH_DEBUG(" ERROR - got %d trying to check group membership", error);
- goto out;
- }
- if (!ismember) {
- KAUTH_DEBUG(" ERROR - cannot create item with supplied group UUID - not a member");
- error = EPERM;
- goto out;
- }
+ return (VFS_RETURNED);
+}
+
+/*
+ * Attempt to unmount any trigger mounts nested underneath a mount.
+ * This is a best effort attempt and no retries are performed here.
+ *
+ * Note: mp->mnt_rwlock is held exclusively on entry (so be carefull)
+ */
+__private_extern__
+void
+vfs_nested_trigger_unmounts(mount_t mp, int flags, vfs_context_t ctx)
+{
+ struct trigger_unmount_info info;
+
+ /* Must have trigger vnodes */
+ if (mp->mnt_numtriggers == 0) {
+ return;
+ }
+ /* Avoid recursive requests (by checking covered vnode) */
+ if ((mp->mnt_vnodecovered != NULL) &&
+ (vnode_getwithref(mp->mnt_vnodecovered) == 0)) {
+ boolean_t recursive = FALSE;
+
+ if ((mp->mnt_vnodecovered->v_mountedhere == mp) &&
+ (mp->mnt_vnodecovered->v_resolve != NULL) &&
+ (mp->mnt_vnodecovered->v_resolve->vr_flags & VNT_VFS_UNMOUNTED)) {
+ recursive = TRUE;
}
- chgroup = 1;
+ vnode_put(mp->mnt_vnodecovered);
+ if (recursive)
+ return;
}
-no_guuid_change:
/*
- * Compute authorisation for group/ownership changes.
+ * Attempt to unmount any nested trigger mounts (best effort)
*/
- if (chowner || chgroup) {
- if (is_suser) {
- KAUTH_DEBUG("ATTR - superuser changing file owner/group, requiring immutability check");
- required_action |= KAUTH_VNODE_CHECKIMMUTABLE;
- } else {
- if (chowner) {
- KAUTH_DEBUG("ATTR - ownership change, requiring TAKE_OWNERSHIP");
- required_action |= KAUTH_VNODE_TAKE_OWNERSHIP;
- }
- if (chgroup && !chowner) {
- KAUTH_DEBUG("ATTR - group change, requiring WRITE_SECURITY");
- required_action |= KAUTH_VNODE_WRITE_SECURITY;
- }
-
- /* clear set-uid and set-gid bits as required by Posix */
- if (VATTR_IS_ACTIVE(vap, va_mode)) {
- newmode = vap->va_mode;
- } else if (VATTR_IS_SUPPORTED(&ova, va_mode)) {
- newmode = ova.va_mode;
- } else {
- KAUTH_DEBUG("CHOWN - trying to change owner but cannot get mode from filesystem to mask setugid bits");
- newmode = 0;
- }
- if (newmode & (S_ISUID | S_ISGID)) {
- VATTR_SET(vap, va_mode, newmode & ~(S_ISUID | S_ISGID));
- KAUTH_DEBUG("CHOWN - masking setugid bits from mode %o to %o", newmode, vap->va_mode);
- }
+ info.ctx = ctx;
+ info.top_mp = mp;
+ info.trigger_vp = NULLVP;
+ info.trigger_vid = 0;
+ info.trigger_mp = NULL;
+ info.flags = flags;
+
+ (void) vfs_iterate(VFS_ITERATE_TAIL_FIRST, trigger_unmount_callback, &info);
+
+ /*
+ * Process remaining nested mount (now that its not referenced)
+ */
+ if ((info.trigger_vp != NULLVP) &&
+ (vnode_getwithvid(info.trigger_vp, info.trigger_vid) == 0)) {
+ vnode_t vp = info.trigger_vp;
+
+ if (info.trigger_mp == vp->v_mountedhere) {
+ (void) vnode_trigger_unresolve(vp, flags, ctx);
}
+ vnode_put(vp);
}
+}
- /*
- * Authorise changes in the ACL.
+int
+vfs_addtrigger(mount_t mp, const char *relpath, struct vnode_trigger_info *vtip, vfs_context_t ctx)
+{
+ struct nameidata nd;
+ int res;
+ vnode_t rvp, vp;
+ struct vnode_trigger_param vtp;
+
+ /*
+ * Must be called for trigger callback, wherein rwlock is held
*/
- if (VATTR_IS_ACTIVE(vap, va_acl)) {
+ lck_rw_assert(&mp->mnt_rwlock, LCK_RW_ASSERT_HELD);
- /* no existing ACL */
- if (!VATTR_IS_ACTIVE(&ova, va_acl) || (ova.va_acl == NULL)) {
+ TRIG_LOG("Adding trigger at %s\n", relpath);
+ TRIG_LOG("Trying VFS_ROOT\n");
- /* adding an ACL */
- if (vap->va_acl != NULL) {
- required_action |= KAUTH_VNODE_WRITE_SECURITY;
- KAUTH_DEBUG("CHMOD - adding ACL");
- }
+ /*
+ * We do a lookup starting at the root of the mountpoint, unwilling
+ * to cross into other mountpoints.
+ */
+ res = VFS_ROOT(mp, &rvp, ctx);
+ if (res != 0) {
+ goto out;
+ }
- /* removing an existing ACL */
- } else if (vap->va_acl == NULL) {
- required_action |= KAUTH_VNODE_WRITE_SECURITY;
- KAUTH_DEBUG("CHMOD - removing ACL");
+ TRIG_LOG("Trying namei\n");
- /* updating an existing ACL */
- } else {
- if (vap->va_acl->acl_entrycount != ova.va_acl->acl_entrycount) {
- /* entry count changed, must be different */
- required_action |= KAUTH_VNODE_WRITE_SECURITY;
- KAUTH_DEBUG("CHMOD - adding/removing ACL entries");
- } else if (vap->va_acl->acl_entrycount > 0) {
- /* both ACLs have the same ACE count, said count is 1 or more, bitwise compare ACLs */
- if (!memcmp(&vap->va_acl->acl_ace[0], &ova.va_acl->acl_ace[0],
- sizeof(struct kauth_ace) * vap->va_acl->acl_entrycount)) {
- required_action |= KAUTH_VNODE_WRITE_SECURITY;
- KAUTH_DEBUG("CHMOD - changing ACL entries");
- }
- }
- }
+ NDINIT(&nd, LOOKUP, OP_LOOKUP, USEDVP | NOCROSSMOUNT | FOLLOW, UIO_SYSSPACE,
+ CAST_USER_ADDR_T(relpath), ctx);
+ nd.ni_dvp = rvp;
+ res = namei(&nd);
+ if (res != 0) {
+ vnode_put(rvp);
+ goto out;
}
+
+ vp = nd.ni_vp;
+ nameidone(&nd);
+ vnode_put(rvp);
- /*
- * Other attributes that require authorisation.
+ TRIG_LOG("Trying vnode_resolver_create()\n");
+
+ /*
+ * Set up blob. vnode_create() takes a larger structure
+ * with creation info, and we needed something different
+ * for this case. One needs to win, or we need to munge both;
+ * vnode_create() wins.
*/
- if (VATTR_IS_ACTIVE(vap, va_encoding))
- required_action |= KAUTH_VNODE_WRITE_ATTRIBUTES;
-
+ bzero(&vtp, sizeof(vtp));
+ vtp.vnt_resolve_func = vtip->vti_resolve_func;
+ vtp.vnt_unresolve_func = vtip->vti_unresolve_func;
+ vtp.vnt_rearm_func = vtip->vti_rearm_func;
+ vtp.vnt_reclaim_func = vtip->vti_reclaim_func;
+ vtp.vnt_reclaim_func = vtip->vti_reclaim_func;
+ vtp.vnt_data = vtip->vti_data;
+ vtp.vnt_flags = vtip->vti_flags;
+
+ res = vnode_resolver_create(mp, vp, &vtp, TRUE);
+ vnode_put(vp);
out:
- if (VATTR_IS_SUPPORTED(&ova, va_acl) && (ova.va_acl != NULL))
- kauth_acl_free(ova.va_acl);
- if (error == 0)
- *actionp = required_action;
- return(error);
+ TRIG_LOG("Returning %d\n", res);
+ return res;
}
+#endif /* CONFIG_TRIGGERS */
-void
-vfs_setlocklocal(mount_t mp)
+vm_offset_t kdebug_vnode(vnode_t vp)
{
- vnode_t vp;
-
- mount_lock(mp);
- mp->mnt_kern_flag |= MNTK_LOCK_LOCAL;
+ return VM_KERNEL_ADDRPERM(vp);
+}
- /*
- * We do not expect anyone to be using any vnodes at the
- * time this routine is called. So no need for vnode locking
- */
- TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) {
- vp->v_flag |= VLOCKLOCAL;
- }
- TAILQ_FOREACH(vp, &mp->mnt_workerqueue, v_mntvnodes) {
- vp->v_flag |= VLOCKLOCAL;
- }
- TAILQ_FOREACH(vp, &mp->mnt_newvnodes, v_mntvnodes) {
- vp->v_flag |= VLOCKLOCAL;
- }
- mount_unlock(mp);
+static int flush_cache_on_write = 0;
+SYSCTL_INT (_kern, OID_AUTO, flush_cache_on_write,
+ CTLFLAG_RW | CTLFLAG_LOCKED, &flush_cache_on_write, 0,
+ "always flush the drive cache on writes to uncached files");
+
+int vnode_should_flush_after_write(vnode_t vp, int ioflag)
+{
+ return (flush_cache_on_write
+ && (ISSET(ioflag, IO_NOCACHE) || vnode_isnocache(vp)));
}
+/*
+ * sysctl for use by disk I/O tracing tools to get the list of existing
+ * vnodes' paths
+ */
-#ifdef JOE_DEBUG
+struct vnode_trace_paths_context {
+ uint64_t count;
+ long path[MAXPATHLEN / sizeof (long) + 1]; /* + 1 in case sizeof (long) does not divide MAXPATHLEN */
+};
-record_vp(vnode_t vp, int count) {
- struct uthread *ut;
- int i;
+static int vnode_trace_path_callback(struct vnode *vp, void *arg) {
+ int len, rv;
+ struct vnode_trace_paths_context *ctx;
- if ((vp->v_flag & VSYSTEM))
- return;
+ ctx = arg;
- ut = get_bsdthread_info(current_thread());
- ut->uu_iocount += count;
+ len = sizeof (ctx->path);
+ rv = vn_getpath(vp, (char *)ctx->path, &len);
+ /* vn_getpath() NUL-terminates, and len includes the NUL */
- if (ut->uu_vpindex < 32) {
- for (i = 0; i < ut->uu_vpindex; i++) {
- if (ut->uu_vps[i] == vp)
- return;
+ if (!rv) {
+ kdebug_lookup_gen_events(ctx->path, len, vp, TRUE);
+
+ if (++(ctx->count) == 1000) {
+ thread_yield_to_preemption();
+ ctx->count = 0;
}
- ut->uu_vps[ut->uu_vpindex] = vp;
- ut->uu_vpindex++;
}
+
+ return VNODE_RETURNED;
}
-#endif
+
+static int vfs_trace_paths_callback(mount_t mp, void *arg) {
+ if (mp->mnt_flag & MNT_LOCAL)
+ vnode_iterate(mp, VNODE_ITERATE_ALL, vnode_trace_path_callback, arg);
+
+ return VFS_RETURNED;
+}
+
+static int sysctl_vfs_trace_paths SYSCTL_HANDLER_ARGS {
+ struct vnode_trace_paths_context ctx;
+
+ (void)oidp;
+ (void)arg1;
+ (void)arg2;
+ (void)req;
+
+ if (!kauth_cred_issuser(kauth_cred_get()))
+ return EPERM;
+
+ if (!kdebug_enable || !kdebug_debugid_enabled(VFS_LOOKUP))
+ return EINVAL;
+
+ bzero(&ctx, sizeof (struct vnode_trace_paths_context));
+
+ vfs_iterate(0, vfs_trace_paths_callback, &ctx);
+
+ return 0;
+}
+
+SYSCTL_PROC(_vfs_generic, OID_AUTO, trace_paths, CTLFLAG_RD | CTLFLAG_LOCKED | CTLFLAG_MASKED, NULL, 0, &sysctl_vfs_trace_paths, "-", "trace_paths");
projects / apple / xnu.git / blobdiff