/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_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 Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Copyright (c) 2000-2016 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ *
+ * 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.
+ *
+ * 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.
- *
- * @APPLE_LICENSE_HEADER_END@
+ * 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_OSREFERENCE_LICENSE_HEADER_END@
*/
/* Copyright (c) 1995, 1997 Apple Computer, Inc. All Rights Reserved */
/*
* SUCH DAMAGE.
*
* @(#)kern_descrip.c 8.8 (Berkeley) 2/14/95
- *
- * History:
- * CHW 8/5/98 Added F_SETSIZE command to truncate without
- * zero filling space
- * CHW 7/6/98 Updated Preallocate command to take a structure
- * and return output.
- * CHW 6/25/98 Fixed a bug in the lock call in fcntl
- * Preallocate command
+ */
+/*
+ * NOTICE: This file was modified by SPARTA, Inc. in 2006 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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
-#include <sys/vnode.h>
-#include <sys/proc.h>
-#include <sys/file.h>
+#include <sys/vnode_internal.h>
+#include <sys/proc_internal.h>
+#include <sys/kauth.h>
+#include <sys/file_internal.h>
+#include <sys/guarded.h>
+#include <sys/priv.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/fcntl.h>
+#include <sys/fsctl.h>
#include <sys/malloc.h>
+#include <sys/mman.h>
#include <sys/syslog.h>
#include <sys/unistd.h>
#include <sys/resourcevar.h>
+#include <sys/aio_kern.h>
+#include <sys/ev.h>
+#include <kern/locks.h>
+#include <sys/uio_internal.h>
+#include <sys/codesign.h>
+#include <sys/codedir_internal.h>
+#include <sys/mount_internal.h>
+#include <sys/kdebug.h>
+#include <sys/sysproto.h>
+#include <sys/pipe.h>
+#include <sys/spawn.h>
+#include <sys/cprotect.h>
+#include <sys/ubc_internal.h>
+
+#include <kern/kern_types.h>
+#include <kern/kalloc.h>
+#include <kern/waitq.h>
+#include <kern/ipc_misc.h>
+
+#include <vm/vm_protos.h>
+#include <mach/mach_port.h>
+
+#include <security/audit/audit.h>
+#if CONFIG_MACF
+#include <security/mac_framework.h>
+#endif
+
+#include <stdbool.h>
+#include <os/atomic_private.h>
+#include <IOKit/IOBSD.h>
+
+#define IPC_KMSG_FLAGS_ALLOW_IMMOVABLE_SEND 0x1
+kern_return_t ipc_object_copyin(ipc_space_t, mach_port_name_t,
+ mach_msg_type_name_t, ipc_port_t *, mach_port_context_t, mach_msg_guard_flags_t *, uint32_t);
+void ipc_port_release_send(ipc_port_t);
+
+static void fileproc_drain(proc_t, struct fileproc *);
+static int finishdup(proc_t p,
+ struct filedesc *fdp, int old, int new, int flags, int32_t *retval);
+
+void fileport_releasefg(struct fileglob *fg);
+
+/* flags for fp_close_and_unlock */
+#define FD_DUP2RESV 1
+
+/* We don't want these exported */
+
+__private_extern__
+int unlink1(vfs_context_t, vnode_t, user_addr_t, enum uio_seg, int);
-#include <sys/mount.h>
+static void fdrelse(struct proc * p, int fd);
+
+extern void file_lock_init(void);
+
+extern kauth_scope_t kauth_scope_fileop;
+
+/* Conflict wait queue for when selects collide (opaque type) */
+extern struct waitq select_conflict_queue;
+
+#ifndef HFS_GET_BOOT_INFO
+#define HFS_GET_BOOT_INFO (FCNTL_FS_SPECIFIC_BASE + 0x00004)
+#endif
+
+#ifndef HFS_SET_BOOT_INFO
+#define HFS_SET_BOOT_INFO (FCNTL_FS_SPECIFIC_BASE + 0x00005)
+#endif
+
+#ifndef APFSIOC_REVERT_TO_SNAPSHOT
+#define APFSIOC_REVERT_TO_SNAPSHOT _IOW('J', 1, u_int64_t)
+#endif
+
+#define f_flag fp_glob->fg_flag
+#define f_type fp_glob->fg_ops->fo_type
+#define f_cred fp_glob->fg_cred
+#define f_ops fp_glob->fg_ops
+#define f_offset fp_glob->fg_offset
+#define f_data fp_glob->fg_data
+#define CHECK_ADD_OVERFLOW_INT64L(x, y) \
+ (((((x) > 0) && ((y) > 0) && ((x) > LLONG_MAX - (y))) || \
+ (((x) < 0) && ((y) < 0) && ((x) < LLONG_MIN - (y)))) \
+ ? 1 : 0)
+
+ZONE_DECLARE(fg_zone, "fileglob",
+ sizeof(struct fileglob), ZC_NOENCRYPT | ZC_ZFREE_CLEARMEM);
+ZONE_DECLARE(fp_zone, "fileproc",
+ sizeof(struct fileproc), ZC_NOENCRYPT | ZC_ZFREE_CLEARMEM);
+ZONE_DECLARE(fdp_zone, "filedesc",
+ sizeof(struct filedesc), ZC_NOENCRYPT | ZC_ZFREE_CLEARMEM);
/*
* Descriptor management.
*/
-struct filelist filehead; /* head of list of open files */
-int nfiles; /* actual number of open files */
-
+int nfiles; /* actual number of open files */
/*
- * System calls on descriptors.
+ * "uninitialized" ops -- ensure FILEGLOB_DTYPE(fg) always exists
*/
-/* ARGSUSED */
-int
-getdtablesize(p, uap, retval)
- struct proc *p;
- void *uap;
- register_t *retval;
-{
+static const struct fileops uninitops;
- *retval = min((int)p->p_rlimit[RLIMIT_NOFILE].rlim_cur, maxfiles);
- return (0);
-}
+os_refgrp_decl(, f_refgrp, "files refcounts", NULL);
+lck_grp_attr_t * file_lck_grp_attr;
+lck_grp_t * file_lck_grp;
+lck_attr_t * file_lck_attr;
-/* ARGSUSED */
-int
-ogetdtablesize(p, uap, retval)
- struct proc *p;
- void *uap;
- register_t *retval;
+#pragma mark fileglobs
+
+/*!
+ * @function fg_free
+ *
+ * @brief
+ * Free a file structure.
+ */
+static void
+fg_free(struct fileglob *fg)
{
+ os_atomic_dec(&nfiles, relaxed);
+
+ if (fg->fg_vn_data) {
+ fg_vn_data_free(fg->fg_vn_data);
+ fg->fg_vn_data = NULL;
+ }
+
+ if (IS_VALID_CRED(fg->fg_cred)) {
+ kauth_cred_unref(&fg->fg_cred);
+ }
+ lck_mtx_destroy(&fg->fg_lock, file_lck_grp);
- *retval = min((int)p->p_rlimit[RLIMIT_NOFILE].rlim_cur, NOFILE);
- return (0);
+#if CONFIG_MACF
+ mac_file_label_destroy(fg);
+#endif
+ zfree(fg_zone, fg);
}
-static __inline__
-void _fdrelse(fdp, fd)
- register struct filedesc *fdp;
- register int fd;
+OS_ALWAYS_INLINE
+void
+fg_ref(proc_t p, struct fileglob *fg)
{
- if (fd < fdp->fd_freefile)
- fdp->fd_freefile = fd;
-#if DIAGNOSTIC
- if (fd > fdp->fd_lastfile)
- panic("fdrelse: fd_lastfile inconsistent");
+#if DEBUG || DEVELOPMENT
+ proc_fdlock_assert(p, LCK_MTX_ASSERT_OWNED);
+#else
+ (void)p;
#endif
- fdp->fd_ofiles[fd] = NULL;
- fdp->fd_ofileflags[fd] = 0;
- while ((fd = fdp->fd_lastfile) > 0 &&
- fdp->fd_ofiles[fd] == NULL &&
- !(fdp->fd_ofileflags[fd] & UF_RESERVED))
- fdp->fd_lastfile--;
+ os_ref_retain_raw(&fg->fg_count, &f_refgrp);
}
-/*
- * Duplicate a file descriptor.
- */
-struct dup_args {
- u_int fd;
-};
-/* ARGSUSED */
-int
-dup(p, uap, retval)
- struct proc *p;
- struct dup_args *uap;
- register_t *retval;
+void
+fg_drop_live(struct fileglob *fg)
{
- register struct filedesc *fdp = p->p_fd;
- register int old = uap->fd;
- int new, error;
-
- if ((u_int)old >= fdp->fd_nfiles ||
- fdp->fd_ofiles[old] == NULL ||
- (fdp->fd_ofileflags[old] & UF_RESERVED))
- return (EBADF);
- if (error = fdalloc(p, 0, &new))
- return (error);
- return (finishdup(fdp, old, new, retval));
+ os_ref_release_live_raw(&fg->fg_count, &f_refgrp);
}
-/*
- * Duplicate a file descriptor to a particular value.
- */
-struct dup2_args {
- u_int from;
- u_int to;
-};
-/* ARGSUSED */
int
-dup2(p, uap, retval)
- struct proc *p;
- struct dup2_args *uap;
- register_t *retval;
+fg_drop(proc_t p, struct fileglob *fg)
{
- register struct filedesc *fdp = p->p_fd;
- register int old = uap->from, new = uap->to;
- int i, error;
+ struct vnode *vp;
+ struct vfs_context context;
+ int error = 0;
- if ((u_int)old >= fdp->fd_nfiles ||
- fdp->fd_ofiles[old] == NULL ||
- (fdp->fd_ofileflags[old] & UF_RESERVED) ||
- (u_int)new >= p->p_rlimit[RLIMIT_NOFILE].rlim_cur ||
- (u_int)new >= maxfiles)
- return (EBADF);
- if (old == new) {
- *retval = new;
- return (0);
+ if (fg == NULL) {
+ return 0;
}
- if ((u_int)new >= fdp->fd_nfiles) {
- if (error = fdalloc(p, new, &i))
- return (error);
- if (new != i) {
- _fdrelse(fdp, i);
- goto closeit;
+
+ /* Set up context with cred stashed in fg */
+ if (p == current_proc()) {
+ context.vc_thread = current_thread();
+ } else {
+ context.vc_thread = NULL;
+ }
+ context.vc_ucred = fg->fg_cred;
+
+ /*
+ * POSIX record locking dictates that any close releases ALL
+ * locks owned by this process. This is handled by setting
+ * a flag in the unlock to free ONLY locks obeying POSIX
+ * semantics, and not to free BSD-style file locks.
+ * If the descriptor was in a message, POSIX-style locks
+ * aren't passed with the descriptor.
+ */
+ if (p && DTYPE_VNODE == FILEGLOB_DTYPE(fg) &&
+ (p->p_ladvflag & P_LADVLOCK)) {
+ struct flock lf = {
+ .l_whence = SEEK_SET,
+ .l_type = F_UNLCK,
+ };
+
+ vp = (struct vnode *)fg->fg_data;
+ if ((error = vnode_getwithref(vp)) == 0) {
+ (void)VNOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_POSIX, &context, NULL);
+ (void)vnode_put(vp);
}
}
- else {
- struct file **fpp;
- char flags;
-closeit:
- if ((flags = fdp->fd_ofileflags[new]) & UF_RESERVED)
- return (EBADF);
- fdp->fd_ofileflags[new] = (flags & ~UF_MAPPED) | UF_RESERVED;
+
+ if (os_ref_release_raw(&fg->fg_count, &f_refgrp) == 0) {
/*
- * dup2() must succeed even if the close has an error.
+ * Since we ensure that fg->fg_ops is always initialized,
+ * it is safe to invoke fo_close on the fg
*/
- if (*(fpp = &fdp->fd_ofiles[new])) {
- struct file *fp = *fpp;
+ error = fo_close(fg, &context);
- *fpp = NULL; (void) closef(fp, p);
- }
+ fg_free(fg);
}
- return (finishdup(fdp, old, new, retval));
+
+ return error;
}
/*
- * The file control system call.
+ * fg_get_vnode
+ *
+ * Description: Return vnode associated with the file structure, if
+ * any. The lifetime of the returned vnode is bound to
+ * the lifetime of the file structure.
+ *
+ * Parameters: fg Pointer to fileglob to
+ * inspect
+ *
+ * Returns: vnode_t
*/
-struct fcntl_args {
- int fd;
- int cmd;
- int arg;
-};
-/* ARGSUSED */
-int
-fcntl(p, uap, retval)
- struct proc *p;
- register struct fcntl_args *uap;
- register_t *retval;
+vnode_t
+fg_get_vnode(struct fileglob *fg)
{
- int fd = uap->fd;
- register struct filedesc *fdp = p->p_fd;
- register struct file *fp;
- register char *pop;
- struct vnode *vp, *devvp;
- int i, tmp, error, error2, flg = F_POSIX;
- struct flock fl;
- fstore_t alloc_struct; /* structure for allocate command */
- u_int32_t alloc_flags = 0;
- off_t offset; /* used for F_SETSIZE */
- int newmin;
- struct radvisory ra_struct;
- fbootstraptransfer_t fbt_struct; /* for F_READBOOTSTRAP and F_WRITEBOOTSTRAP */
- struct log2phys l2p_struct; /* structure for allocate command */
- daddr_t lbn, bn;
- int devBlockSize = 0;
-
- if ((u_int)fd >= fdp->fd_nfiles ||
- (fp = fdp->fd_ofiles[fd]) == NULL ||
- (fdp->fd_ofileflags[fd] & UF_RESERVED))
- return (EBADF);
- pop = &fdp->fd_ofileflags[fd];
- switch (uap->cmd) {
+ if (FILEGLOB_DTYPE(fg) == DTYPE_VNODE) {
+ return (vnode_t)fg->fg_data;
+ } else {
+ return NULL;
+ }
+}
- case F_DUPFD:
- newmin = (long)uap->arg;
- if ((u_int)newmin >= p->p_rlimit[RLIMIT_NOFILE].rlim_cur ||
- (u_int)newmin >= maxfiles)
- return (EINVAL);
- if (error = fdalloc(p, newmin, &i))
- return (error);
- return (finishdup(fdp, fd, i, retval));
+bool
+fg_sendable(struct fileglob *fg)
+{
+ switch (FILEGLOB_DTYPE(fg)) {
+ case DTYPE_VNODE:
+ case DTYPE_SOCKET:
+ case DTYPE_PIPE:
+ case DTYPE_PSXSHM:
+ case DTYPE_NETPOLICY:
+ return (fg->fg_lflags & FG_CONFINED) == 0;
- case F_GETFD:
- *retval = (*pop & UF_EXCLOSE)? 1 : 0;
- return (0);
+ default:
+ return false;
+ }
+}
- case F_SETFD:
- *pop = (*pop &~ UF_EXCLOSE) |
- ((long)(uap->arg) & 1)? UF_EXCLOSE : 0;
- return (0);
- case F_GETFL:
- *retval = OFLAGS(fp->f_flag);
- return (0);
+#pragma mark fileprocs
- case F_SETFL:
- fp->f_flag &= ~FCNTLFLAGS;
- fp->f_flag |= FFLAGS((long)uap->arg) & FCNTLFLAGS;
- tmp = fp->f_flag & FNONBLOCK;
- error = (*fp->f_ops->fo_ioctl)(fp, FIONBIO, (caddr_t)&tmp, p);
- if (error)
- return (error);
- tmp = fp->f_flag & FASYNC;
- error = (*fp->f_ops->fo_ioctl)(fp, FIOASYNC, (caddr_t)&tmp, p);
- if (!error)
- return (0);
- fp->f_flag &= ~FNONBLOCK;
- tmp = 0;
- (void) (*fp->f_ops->fo_ioctl)(fp, FIONBIO, (caddr_t)&tmp, p);
- return (error);
+/*
+ * check_file_seek_range
+ *
+ * Description: Checks if seek offsets are in the range of 0 to LLONG_MAX.
+ *
+ * Parameters: fl Flock structure.
+ * cur_file_offset Current offset in the file.
+ *
+ * Returns: 0 on Success.
+ * EOVERFLOW on overflow.
+ * EINVAL on offset less than zero.
+ */
- case F_GETOWN:
- if (fp->f_type == DTYPE_SOCKET) {
- *retval = ((struct socket *)fp->f_data)->so_pgid;
- return (0);
+static int
+check_file_seek_range(struct flock *fl, off_t cur_file_offset)
+{
+ if (fl->l_whence == SEEK_CUR) {
+ /* Check if the start marker is beyond LLONG_MAX. */
+ if (CHECK_ADD_OVERFLOW_INT64L(fl->l_start, cur_file_offset)) {
+ /* Check if start marker is negative */
+ if (fl->l_start < 0) {
+ return EINVAL;
+ }
+ return EOVERFLOW;
}
- error = (*fp->f_ops->fo_ioctl)
- (fp, (int)TIOCGPGRP, (caddr_t)retval, p);
- *retval = -*retval;
- return (error);
-
- case F_SETOWN:
- if (fp->f_type == DTYPE_SOCKET) {
- ((struct socket *)fp->f_data)->so_pgid =
- (long)uap->arg;
- return (0);
+ /* Check if the start marker is negative. */
+ if (fl->l_start + cur_file_offset < 0) {
+ return EINVAL;
}
- if ((long)uap->arg <= 0) {
- uap->arg = (void *)(-(long)(uap->arg));
- } else {
- struct proc *p1 = pfind((long)uap->arg);
- if (p1 == 0)
- return (ESRCH);
- uap->arg = (void *)(long)p1->p_pgrp->pg_id;
+ /* Check if end marker is beyond LLONG_MAX. */
+ if ((fl->l_len > 0) && (CHECK_ADD_OVERFLOW_INT64L(fl->l_start +
+ cur_file_offset, fl->l_len - 1))) {
+ return EOVERFLOW;
}
- return ((*fp->f_ops->fo_ioctl)
- (fp, (int)TIOCSPGRP, (caddr_t)&uap->arg, p));
-
- case F_SETLKW:
- flg |= F_WAIT;
- /* Fall into F_SETLK */
-
- case F_SETLK:
- if (fp->f_type != DTYPE_VNODE)
- return (EBADF);
- vp = (struct vnode *)fp->f_data;
- /* Copy in the lock structure */
- error = copyin((caddr_t)uap->arg, (caddr_t)&fl,
- sizeof (fl));
- if (error)
- return (error);
- if (fl.l_whence == SEEK_CUR)
- fl.l_start += fp->f_offset;
- switch (fl.l_type) {
-
- case F_RDLCK:
- if ((fp->f_flag & FREAD) == 0)
- return (EBADF);
- p->p_flag |= P_ADVLOCK;
- return (VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &fl, flg));
-
- case F_WRLCK:
- if ((fp->f_flag & FWRITE) == 0)
- return (EBADF);
- p->p_flag |= P_ADVLOCK;
- return (VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &fl, flg));
-
- case F_UNLCK:
- return (VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &fl,
- F_POSIX));
-
- default:
- return (EINVAL);
+ /* Check if the end marker is negative. */
+ if ((fl->l_len <= 0) && (fl->l_start + cur_file_offset +
+ fl->l_len < 0)) {
+ return EINVAL;
}
+ } else if (fl->l_whence == SEEK_SET) {
+ /* Check if the start marker is negative. */
+ if (fl->l_start < 0) {
+ return EINVAL;
+ }
+ /* Check if the end marker is beyond LLONG_MAX. */
+ if ((fl->l_len > 0) &&
+ CHECK_ADD_OVERFLOW_INT64L(fl->l_start, fl->l_len - 1)) {
+ return EOVERFLOW;
+ }
+ /* Check if the end marker is negative. */
+ if ((fl->l_len < 0) && fl->l_start + fl->l_len < 0) {
+ return EINVAL;
+ }
+ }
+ return 0;
+}
- case F_GETLK:
- if (fp->f_type != DTYPE_VNODE)
- return (EBADF);
- vp = (struct vnode *)fp->f_data;
- /* Copy in the lock structure */
- error = copyin((caddr_t)uap->arg, (caddr_t)&fl,
- sizeof (fl));
- if (error)
- return (error);
- if (fl.l_whence == SEEK_CUR)
- fl.l_start += fp->f_offset;
- if (error = VOP_ADVLOCK(vp, (caddr_t)p, F_GETLK, &fl, F_POSIX))
- return (error);
- return (copyout((caddr_t)&fl, (caddr_t)uap->arg,
- sizeof (fl)));
-
- case F_PREALLOCATE:
-
- /* Copy in the structure */
-
- error = copyin((caddr_t)uap->arg, (caddr_t)&alloc_struct,
- sizeof (alloc_struct));
-
- if (error)
- return (error);
-
- /* now set the space allocated to 0 and pass it out in
- case we get a parameter checking error */
-
- alloc_struct.fst_bytesalloc = 0;
-
- error = copyout((caddr_t)&alloc_struct, (caddr_t)uap->arg,
- sizeof (alloc_struct));
-
- if (error)
- return(error);
- /* First make sure that we have write permission */
+/*
+ * file_lock_init
+ *
+ * Description: Initialize the file lock group and the uipc and flist locks
+ *
+ * Parameters: (void)
+ *
+ * Returns: void
+ *
+ * Notes: Called at system startup from bsd_init().
+ */
+void
+file_lock_init(void)
+{
+ /* allocate file lock group attribute and group */
+ file_lck_grp_attr = lck_grp_attr_alloc_init();
- if ((fp->f_flag & FWRITE) == 0)
- return (EBADF);
+ file_lck_grp = lck_grp_alloc_init("file", file_lck_grp_attr);
+ /* Allocate file lock attribute */
+ file_lck_attr = lck_attr_alloc_init();
+}
- /* Do some simple parameter checking */
+void
+proc_dirs_lock_shared(proc_t p)
+{
+ lck_rw_lock_shared(&p->p_dirs_lock);
+}
- /* set up the flags */
+void
+proc_dirs_unlock_shared(proc_t p)
+{
+ lck_rw_unlock_shared(&p->p_dirs_lock);
+}
- alloc_flags |= PREALLOCATE;
-
- if (alloc_struct.fst_flags & F_ALLOCATECONTIG) {
- alloc_flags |= ALLOCATECONTIG;
- }
+void
+proc_dirs_lock_exclusive(proc_t p)
+{
+ lck_rw_lock_exclusive(&p->p_dirs_lock);
+}
- if (alloc_struct.fst_flags & F_ALLOCATEALL) {
- alloc_flags |= ALLOCATEALL;
- }
+void
+proc_dirs_unlock_exclusive(proc_t p)
+{
+ lck_rw_unlock_exclusive(&p->p_dirs_lock);
+}
- /* Do any position mode specific stuff. The only */
- /* position mode supported now is PEOFPOSMODE */
+/*
+ * proc_fdlock, proc_fdlock_spin
+ *
+ * Description: Lock to control access to the per process struct fileproc
+ * and struct filedesc
+ *
+ * Parameters: p Process to take the lock on
+ *
+ * Returns: void
+ *
+ * Notes: The lock is initialized in forkproc() and destroyed in
+ * reap_child_process().
+ */
+void
+proc_fdlock(proc_t p)
+{
+ lck_mtx_lock(&p->p_fdmlock);
+}
- switch (alloc_struct.fst_posmode) {
-
- case F_PEOFPOSMODE:
+void
+proc_fdlock_spin(proc_t p)
+{
+ lck_mtx_lock_spin(&p->p_fdmlock);
+}
- if ((alloc_struct.fst_offset != 0) ||
- (alloc_struct.fst_length < 0))
- return (EINVAL);
+void
+proc_fdlock_assert(proc_t p, int assertflags)
+{
+ lck_mtx_assert(&p->p_fdmlock, assertflags);
+}
- alloc_flags |= ALLOCATEFROMPEOF;
- break;
- default:
+/*
+ * proc_fdunlock
+ *
+ * Description: Unlock the lock previously locked by a call to proc_fdlock()
+ *
+ * Parameters: p Process to drop the lock on
+ *
+ * Returns: void
+ */
+void
+proc_fdunlock(proc_t p)
+{
+ lck_mtx_unlock(&p->p_fdmlock);
+}
- return(EINVAL);
+struct fdt_iterator
+fdt_next(proc_t p, int fd, bool only_settled)
+{
+ struct fdt_iterator it;
+ struct filedesc *fdp = p->p_fd;
+ struct fileproc *fp;
+ int nfds = min(fdp->fd_lastfile + 1, fdp->fd_nfiles);
+ while (++fd < nfds) {
+ fp = fdp->fd_ofiles[fd];
+ if (fp == NULL || fp->fp_glob == NULL) {
+ continue;
}
+ if (only_settled && (fdp->fd_ofileflags[fd] & UF_RESERVED)) {
+ continue;
+ }
+ it.fdti_fd = fd;
+ it.fdti_fp = fp;
+ return it;
+ }
+ it.fdti_fd = nfds;
+ it.fdti_fp = NULL;
+ return it;
+}
- /* Now lock the vnode and call allocate to get the space */
-
- vp = (struct vnode *)fp->f_data;
-
- VOP_LOCK(vp,LK_EXCLUSIVE,p);
- error = VOP_ALLOCATE(vp,alloc_struct.fst_length,alloc_flags,
- &alloc_struct.fst_bytesalloc,fp->f_cred,p);
- VOP_UNLOCK(vp,0,p);
+struct fdt_iterator
+fdt_prev(proc_t p, int fd, bool only_settled)
+{
+ struct fdt_iterator it;
+ struct filedesc *fdp = p->p_fd;
+ struct fileproc *fp;
- if (error2 = (copyout((caddr_t)&alloc_struct, (caddr_t)uap->arg,
- sizeof (alloc_struct)))) {
- if (error) {
- return(error);
- } else {
- return(error2);
- }
+ while (--fd >= 0) {
+ fp = fdp->fd_ofiles[fd];
+ if (fp == NULL || fp->fp_glob == NULL) {
+ continue;
+ }
+ if (only_settled && (fdp->fd_ofileflags[fd] & UF_RESERVED)) {
+ continue;
}
+ it.fdti_fd = fd;
+ it.fdti_fp = fp;
+ return it;
+ }
- return(error);
-
- case F_SETSIZE:
-
- /* Copy in the structure */
+ it.fdti_fd = -1;
+ it.fdti_fp = NULL;
+ return it;
+}
- error = copyin((caddr_t)uap->arg, (caddr_t)&offset,
- sizeof (off_t));
+/*
+ * System calls on descriptors.
+ */
- if (error)
- return (error);
+/*
+ * sys_getdtablesize
+ *
+ * Description: Returns the per process maximum size of the descriptor table
+ *
+ * Parameters: p Process being queried
+ * retval Pointer to the call return area
+ *
+ * Returns: 0 Success
+ *
+ * Implicit returns:
+ * *retval (modified) Size of dtable
+ */
+int
+sys_getdtablesize(proc_t p, __unused struct getdtablesize_args *uap, int32_t *retval)
+{
+ *retval = (int32_t)MIN(proc_limitgetcur(p, RLIMIT_NOFILE, TRUE), maxfilesperproc);
- /* First make sure that we are root. Growing a file */
- /* without zero filling the data is a security hole */
- /* root would have access anyway so we'll allow it */
+ return 0;
+}
- if (!is_suser()) {
- return (EACCES);
- }
- /* Now lock the vnode and call allocate to get the space */
+static void
+procfdtbl_reservefd(struct proc * p, int fd)
+{
+ p->p_fd->fd_ofiles[fd] = NULL;
+ p->p_fd->fd_ofileflags[fd] |= UF_RESERVED;
+}
- vp = (struct vnode *)fp->f_data;
+void
+procfdtbl_releasefd(struct proc * p, int fd, struct fileproc * fp)
+{
+ if (fp != NULL) {
+ p->p_fd->fd_ofiles[fd] = fp;
+ }
+ p->p_fd->fd_ofileflags[fd] &= ~UF_RESERVED;
+ if ((p->p_fd->fd_ofileflags[fd] & UF_RESVWAIT) == UF_RESVWAIT) {
+ p->p_fd->fd_ofileflags[fd] &= ~UF_RESVWAIT;
+ wakeup(&p->p_fd);
+ }
+}
- VOP_LOCK(vp,LK_EXCLUSIVE,p);
- error = VOP_TRUNCATE(vp,offset,IO_NOZEROFILL,fp->f_cred,p);
- VOP_UNLOCK(vp,0,p);
+static void
+procfdtbl_waitfd(struct proc * p, int fd)
+{
+ p->p_fd->fd_ofileflags[fd] |= UF_RESVWAIT;
+ msleep(&p->p_fd, &p->p_fdmlock, PRIBIO, "ftbl_waitfd", NULL);
+}
- return(error);
-
- case F_RDAHEAD:
- vp = (struct vnode *)fp->f_data;
-
- simple_lock(&vp->v_interlock);
- if (uap->arg)
- vp->v_flag &= ~VRAOFF;
- else
- vp->v_flag |= VRAOFF;
- simple_unlock(&vp->v_interlock);
+static void
+procfdtbl_clearfd(struct proc * p, int fd)
+{
+ int waiting;
- return (0);
+ waiting = (p->p_fd->fd_ofileflags[fd] & UF_RESVWAIT);
+ p->p_fd->fd_ofiles[fd] = NULL;
+ p->p_fd->fd_ofileflags[fd] = 0;
+ if (waiting == UF_RESVWAIT) {
+ wakeup(&p->p_fd);
+ }
+}
- case F_NOCACHE:
- vp = (struct vnode *)fp->f_data;
-
- simple_lock(&vp->v_interlock);
- if (uap->arg)
- vp->v_flag |= VNOCACHE_DATA;
- else
- vp->v_flag &= ~VNOCACHE_DATA;
- simple_unlock(&vp->v_interlock);
+/*
+ * fdrelse
+ *
+ * Description: Inline utility function to free an fd in a filedesc
+ *
+ * Parameters: fdp Pointer to filedesc fd lies in
+ * fd fd to free
+ * reserv fd should be reserved
+ *
+ * Returns: void
+ *
+ * Locks: Assumes proc_fdlock for process pointing to fdp is held by
+ * the caller
+ */
+static void
+fdrelse(struct proc * p, int fd)
+{
+ struct filedesc *fdp = p->p_fd;
+ int nfd = 0;
- return (0);
+ if (fd < fdp->fd_freefile) {
+ fdp->fd_freefile = fd;
+ }
+#if DIAGNOSTIC
+ if (fd > fdp->fd_lastfile) {
+ panic("fdrelse: fd_lastfile inconsistent");
+ }
+#endif
+ procfdtbl_clearfd(p, fd);
- case F_RDADVISE:
- vp = (struct vnode *)fp->f_data;
+ while ((nfd = fdp->fd_lastfile) > 0 &&
+ fdp->fd_ofiles[nfd] == NULL &&
+ !(fdp->fd_ofileflags[nfd] & UF_RESERVED)) {
+ /* JMM - What about files with lingering EV_VANISHED knotes? */
+ fdp->fd_lastfile--;
+ }
+}
- if (error = copyin((caddr_t)uap->arg, (caddr_t)&ra_struct, sizeof (ra_struct)))
- return(error);
- return (VOP_IOCTL(vp, 1, &ra_struct, 0, fp->f_cred, p));
-
- case F_READBOOTSTRAP:
- case F_WRITEBOOTSTRAP:
-
- /* Copy in the structure */
- error = copyin((caddr_t)uap->arg, (caddr_t)&fbt_struct,
- sizeof (fbt_struct));
+int
+fd_rdwr(
+ int fd,
+ enum uio_rw rw,
+ uint64_t base,
+ int64_t len,
+ enum uio_seg segflg,
+ off_t offset,
+ int io_flg,
+ int64_t *aresid)
+{
+ struct fileproc *fp;
+ proc_t p;
+ int error = 0;
+ int flags = 0;
+ int spacetype;
+ uio_t auio = NULL;
+ char uio_buf[UIO_SIZEOF(1)];
+ struct vfs_context context = *(vfs_context_current());
+
+ p = current_proc();
+
+ error = fp_lookup(p, fd, &fp, 0);
+ if (error) {
+ return error;
+ }
- if (error)
- return (error);
+ switch (FILEGLOB_DTYPE(fp->fp_glob)) {
+ case DTYPE_VNODE:
+ case DTYPE_PIPE:
+ case DTYPE_SOCKET:
+ break;
+ default:
+ error = EINVAL;
+ goto out;
+ }
+ if (rw == UIO_WRITE && !(fp->f_flag & FWRITE)) {
+ error = EBADF;
+ goto out;
+ }
+ if (rw == UIO_READ && !(fp->f_flag & FREAD)) {
+ error = EBADF;
+ goto out;
+ }
- if (uap->cmd == F_WRITEBOOTSTRAP) {
- /* First make sure that we are root. Updating the */
- /* bootstrap on a disk could be a security hole */
+ context.vc_ucred = fp->fp_glob->fg_cred;
- if (!is_suser()) {
- return (EACCES);
- }
- };
+ if (UIO_SEG_IS_USER_SPACE(segflg)) {
+ spacetype = proc_is64bit(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
+ } else {
+ spacetype = UIO_SYSSPACE;
+ }
- /* Now lock the vnode and call VOP_IOCTL to handle the I/O: */
+ auio = uio_createwithbuffer(1, offset, spacetype, rw, &uio_buf[0], sizeof(uio_buf));
- vp = (struct vnode *)fp->f_data;
- if (vp->v_tag != VT_HFS) {
- error = EINVAL;
+ uio_addiov(auio, (user_addr_t)base, (user_size_t)len);
+
+ if (!(io_flg & IO_APPEND)) {
+ flags = FOF_OFFSET;
+ }
+
+ if (rw == UIO_WRITE) {
+ user_ssize_t orig_resid = uio_resid(auio);
+ error = fo_write(fp, auio, flags, &context);
+ if (uio_resid(auio) < orig_resid) {
+ os_atomic_or(&fp->fp_glob->fg_flag, FWASWRITTEN, relaxed);
+ }
+ } else {
+ error = fo_read(fp, auio, flags, &context);
+ }
+
+ if (aresid) {
+ *aresid = uio_resid(auio);
+ } else if (uio_resid(auio) && error == 0) {
+ error = EIO;
+ }
+out:
+ fp_drop(p, fd, fp, 0);
+ return error;
+}
+
+
+
+/*
+ * sys_dup
+ *
+ * Description: Duplicate a file descriptor.
+ *
+ * Parameters: p Process performing the dup
+ * uap->fd The fd to dup
+ * retval Pointer to the call return area
+ *
+ * Returns: 0 Success
+ * !0 Errno
+ *
+ * Implicit returns:
+ * *retval (modified) The new descriptor
+ */
+int
+sys_dup(proc_t p, struct dup_args *uap, int32_t *retval)
+{
+ struct filedesc *fdp = p->p_fd;
+ int old = uap->fd;
+ int new, error;
+ struct fileproc *fp;
+
+ proc_fdlock(p);
+ if ((error = fp_lookup(p, old, &fp, 1))) {
+ proc_fdunlock(p);
+ return error;
+ }
+ if (FP_ISGUARDED(fp, GUARD_DUP)) {
+ error = fp_guard_exception(p, old, fp, kGUARD_EXC_DUP);
+ (void) fp_drop(p, old, fp, 1);
+ proc_fdunlock(p);
+ return error;
+ }
+ if ((error = fdalloc(p, 0, &new))) {
+ fp_drop(p, old, fp, 1);
+ proc_fdunlock(p);
+ return error;
+ }
+ error = finishdup(p, fdp, old, new, 0, retval);
+ fp_drop(p, old, fp, 1);
+ proc_fdunlock(p);
+
+ if (ENTR_SHOULDTRACE && FILEGLOB_DTYPE(fp->fp_glob) == DTYPE_SOCKET) {
+ KERNEL_ENERGYTRACE(kEnTrActKernSocket, DBG_FUNC_START,
+ new, 0, (int64_t)VM_KERNEL_ADDRPERM(fp->f_data));
+ }
+
+ return error;
+}
+
+/*
+ * sys_dup2
+ *
+ * Description: Duplicate a file descriptor to a particular value.
+ *
+ * Parameters: p Process performing the dup
+ * uap->from The fd to dup
+ * uap->to The fd to dup it to
+ * retval Pointer to the call return area
+ *
+ * Returns: 0 Success
+ * !0 Errno
+ *
+ * Implicit returns:
+ * *retval (modified) The new descriptor
+ */
+int
+sys_dup2(proc_t p, struct dup2_args *uap, int32_t *retval)
+{
+ return dup2(p, uap->from, uap->to, retval);
+}
+
+int
+dup2(proc_t p, int old, int new, int *retval)
+{
+ struct filedesc *fdp = p->p_fd;
+ struct fileproc *fp, *nfp;
+ int i, error;
+ rlim_t nofile = proc_limitgetcur(p, RLIMIT_NOFILE, TRUE);
+
+ proc_fdlock(p);
+
+startover:
+ if ((error = fp_lookup(p, old, &fp, 1))) {
+ proc_fdunlock(p);
+ return error;
+ }
+ if (FP_ISGUARDED(fp, GUARD_DUP)) {
+ error = fp_guard_exception(p, old, fp, kGUARD_EXC_DUP);
+ (void) fp_drop(p, old, fp, 1);
+ proc_fdunlock(p);
+ return error;
+ }
+ if (new < 0 ||
+ (rlim_t)new >= nofile ||
+ new >= maxfilesperproc) {
+ fp_drop(p, old, fp, 1);
+ proc_fdunlock(p);
+ return EBADF;
+ }
+ if (old == new) {
+ fp_drop(p, old, fp, 1);
+ *retval = new;
+ proc_fdunlock(p);
+ return 0;
+ }
+ if (new < 0 || new >= fdp->fd_nfiles) {
+ if ((error = fdalloc(p, new, &i))) {
+ fp_drop(p, old, fp, 1);
+ proc_fdunlock(p);
+ return error;
+ }
+ if (new != i) {
+ fdrelse(p, i);
+ goto closeit;
+ }
+ } else {
+closeit:
+ if ((fdp->fd_ofileflags[new] & UF_RESERVED) == UF_RESERVED) {
+ fp_drop(p, old, fp, 1);
+ procfdtbl_waitfd(p, new);
+#if DIAGNOSTIC
+ proc_fdlock_assert(p, LCK_MTX_ASSERT_OWNED);
+#endif
+ goto startover;
+ }
+
+ if ((nfp = fdp->fd_ofiles[new]) != NULL) {
+ if (FP_ISGUARDED(nfp, GUARD_CLOSE)) {
+ fp_drop(p, old, fp, 1);
+ error = fp_guard_exception(p,
+ new, nfp, kGUARD_EXC_CLOSE);
+ proc_fdunlock(p);
+ return error;
+ }
+ (void)fp_close_and_unlock(p, new, nfp, FD_DUP2RESV);
+ proc_fdlock(p);
+ assert(fdp->fd_ofileflags[new] & UF_RESERVED);
} else {
- VOP_LOCK(vp,LK_EXCLUSIVE,p);
- error = VOP_IOCTL(vp, (uap->cmd == F_WRITEBOOTSTRAP) ? 3 : 2, &fbt_struct, 0, fp->f_cred, p);
- VOP_UNLOCK(vp,0,p);
- };
+#if DIAGNOSTIC
+ if (fdp->fd_ofiles[new] != NULL) {
+ panic("dup2: no ref on fileproc %d", new);
+ }
+#endif
+ procfdtbl_reservefd(p, new);
+ }
+ }
+#if DIAGNOSTIC
+ if (fdp->fd_ofiles[new] != 0) {
+ panic("dup2: overwriting fd_ofiles with new %d", new);
+ }
+ if ((fdp->fd_ofileflags[new] & UF_RESERVED) == 0) {
+ panic("dup2: unreserved fileflags with new %d", new);
+ }
+#endif
+ error = finishdup(p, fdp, old, new, 0, retval);
+ fp_drop(p, old, fp, 1);
+ proc_fdunlock(p);
- return(error);
-
- case F_LOG2PHYS:
- if (fp->f_type != DTYPE_VNODE)
- return (EBADF);
- vp = (struct vnode *)fp->f_data;
- VOP_LOCK(vp, LK_EXCLUSIVE, p);
- if (VOP_OFFTOBLK(vp, fp->f_offset, &lbn))
- panic("fcntl LOG2PHYS OFFTOBLK");
- if (VOP_BLKTOOFF(vp, lbn, &offset))
- panic("fcntl LOG2PHYS BLKTOOFF1");
- error = VOP_BMAP(vp, lbn, &devvp, &bn, 0);
- VOP_DEVBLOCKSIZE(devvp, &devBlockSize);
- VOP_UNLOCK(vp, 0, p);
+ return error;
+}
+
+
+/*
+ * fcntl
+ *
+ * Description: The file control system call.
+ *
+ * Parameters: p Process performing the fcntl
+ * uap->fd The fd to operate against
+ * uap->cmd The command to perform
+ * uap->arg Pointer to the command argument
+ * retval Pointer to the call return area
+ *
+ * Returns: 0 Success
+ * !0 Errno (see fcntl_nocancel)
+ *
+ * Implicit returns:
+ * *retval (modified) fcntl return value (if any)
+ *
+ * Notes: This system call differs from fcntl_nocancel() in that it
+ * tests for cancellation prior to performing a potentially
+ * blocking operation.
+ */
+int
+sys_fcntl(proc_t p, struct fcntl_args *uap, int32_t *retval)
+{
+ __pthread_testcancel(1);
+ return sys_fcntl_nocancel(p, (struct fcntl_nocancel_args *)uap, retval);
+}
+
+#define ACCOUNT_OPENFROM_ENTITLEMENT \
+ "com.apple.private.vfs.role-account-openfrom"
+
+/*
+ * sys_fcntl_nocancel
+ *
+ * Description: A non-cancel-testing file control system call.
+ *
+ * Parameters: p Process performing the fcntl
+ * uap->fd The fd to operate against
+ * uap->cmd The command to perform
+ * uap->arg Pointer to the command argument
+ * retval Pointer to the call return area
+ *
+ * Returns: 0 Success
+ * EINVAL
+ * fp_lookup:EBADF Bad file descriptor
+ * [F_DUPFD]
+ * fdalloc:EMFILE
+ * fdalloc:ENOMEM
+ * finishdup:EBADF
+ * finishdup:ENOMEM
+ * [F_SETOWN]
+ * ESRCH
+ * [F_SETLK]
+ * EBADF
+ * EOVERFLOW
+ * copyin:EFAULT
+ * vnode_getwithref:???
+ * VNOP_ADVLOCK:???
+ * msleep:ETIMEDOUT
+ * [F_GETLK]
+ * EBADF
+ * EOVERFLOW
+ * copyin:EFAULT
+ * copyout:EFAULT
+ * vnode_getwithref:???
+ * VNOP_ADVLOCK:???
+ * [F_PREALLOCATE]
+ * EBADF
+ * EINVAL
+ * copyin:EFAULT
+ * copyout:EFAULT
+ * vnode_getwithref:???
+ * VNOP_ALLOCATE:???
+ * [F_SETSIZE,F_RDADVISE]
+ * EBADF
+ * EINVAL
+ * copyin:EFAULT
+ * vnode_getwithref:???
+ * [F_RDAHEAD,F_NOCACHE]
+ * EBADF
+ * vnode_getwithref:???
+ * [???]
+ *
+ * Implicit returns:
+ * *retval (modified) fcntl return value (if any)
+ */
+int
+sys_fcntl_nocancel(proc_t p, struct fcntl_nocancel_args *uap, int32_t *retval)
+{
+ int fd = uap->fd;
+ struct filedesc *fdp = p->p_fd;
+ struct fileproc *fp;
+ char *pop;
+ struct vnode *vp = NULLVP; /* for AUDIT_ARG() at end */
+ unsigned int oflags, nflags;
+ int i, tmp, error, error2, flg = 0;
+ struct flock fl = {};
+ struct flocktimeout fltimeout;
+ struct timespec *timeout = NULL;
+ struct vfs_context context;
+ off_t offset;
+ int newmin;
+ daddr64_t lbn, bn;
+ unsigned int fflag;
+ user_addr_t argp;
+ boolean_t is64bit;
+ rlim_t nofile;
+ int has_entitlement = 0;
+
+ AUDIT_ARG(fd, uap->fd);
+ AUDIT_ARG(cmd, uap->cmd);
+
+ nofile = proc_limitgetcur(p, RLIMIT_NOFILE, TRUE);
+
+ proc_fdlock(p);
+ if ((error = fp_lookup(p, fd, &fp, 1))) {
+ proc_fdunlock(p);
+ return error;
+ }
+ context.vc_thread = current_thread();
+ context.vc_ucred = fp->f_cred;
+
+ is64bit = proc_is64bit(p);
+ if (is64bit) {
+ argp = uap->arg;
+ } else {
+ /*
+ * Since the arg parameter is defined as a long but may be
+ * either a long or a pointer we must take care to handle
+ * sign extension issues. Our sys call munger will sign
+ * extend a long when we are called from a 32-bit process.
+ * Since we can never have an address greater than 32-bits
+ * from a 32-bit process we lop off the top 32-bits to avoid
+ * getting the wrong address
+ */
+ argp = CAST_USER_ADDR_T((uint32_t)uap->arg);
+ }
+
+#if CONFIG_MACF
+ error = mac_file_check_fcntl(proc_ucred(p), fp->fp_glob, uap->cmd,
+ uap->arg);
+ if (error) {
+ goto out;
+ }
+#endif
+
+ pop = &fdp->fd_ofileflags[fd];
+
+ switch (uap->cmd) {
+ case F_DUPFD:
+ case F_DUPFD_CLOEXEC:
+ if (FP_ISGUARDED(fp, GUARD_DUP)) {
+ error = fp_guard_exception(p, fd, fp, kGUARD_EXC_DUP);
+ goto out;
+ }
+ newmin = CAST_DOWN_EXPLICIT(int, uap->arg); /* arg is an int, so we won't lose bits */
+ AUDIT_ARG(value32, newmin);
+ if ((rlim_t)newmin >= nofile ||
+ newmin >= maxfilesperproc) {
+ error = EINVAL;
+ goto out;
+ }
+ if ((error = fdalloc(p, newmin, &i))) {
+ goto out;
+ }
+ error = finishdup(p, fdp, fd, i,
+ uap->cmd == F_DUPFD_CLOEXEC ? UF_EXCLOSE : 0, retval);
+ goto out;
+
+ case F_GETFD:
+ *retval = (*pop & UF_EXCLOSE)? FD_CLOEXEC : 0;
+ error = 0;
+ goto out;
+
+ case F_SETFD:
+ AUDIT_ARG(value32, (uint32_t)uap->arg);
+ if (uap->arg & FD_CLOEXEC) {
+ *pop |= UF_EXCLOSE;
+ } else {
+ if (FILEPROC_TYPE(fp) == FTYPE_GUARDED) {
+ error = fp_guard_exception(p,
+ fd, fp, kGUARD_EXC_NOCLOEXEC);
+ goto out;
+ }
+ *pop &= ~UF_EXCLOSE;
+ }
+ error = 0;
+ goto out;
+
+ case F_GETFL:
+ *retval = OFLAGS(fp->f_flag);
+ error = 0;
+ goto out;
+
+ case F_SETFL:
+ // FIXME (rdar://54898652)
+ //
+ // this code is broken if fnctl(F_SETFL), ioctl() are
+ // called concurrently for the same fileglob.
+
+ tmp = CAST_DOWN_EXPLICIT(int, uap->arg); /* arg is an int, so we won't lose bits */
+ AUDIT_ARG(value32, tmp);
+
+ os_atomic_rmw_loop(&fp->f_flag, oflags, nflags, relaxed, {
+ nflags = oflags & ~FCNTLFLAGS;
+ nflags |= FFLAGS(tmp) & FCNTLFLAGS;
+ });
+ tmp = nflags & FNONBLOCK;
+ error = fo_ioctl(fp, FIONBIO, (caddr_t)&tmp, &context);
+ if (error) {
+ goto out;
+ }
+ tmp = nflags & FASYNC;
+ error = fo_ioctl(fp, FIOASYNC, (caddr_t)&tmp, &context);
if (!error) {
- l2p_struct.l2p_flags = 0; /* for now */
- l2p_struct.l2p_contigbytes = 0; /* for now */
- l2p_struct.l2p_devoffset = bn * devBlockSize;
- l2p_struct.l2p_devoffset += fp->f_offset - offset;
- error = copyout((caddr_t)&l2p_struct,
- (caddr_t)uap->arg,
- sizeof (l2p_struct));
+ goto out;
+ }
+ os_atomic_andnot(&fp->f_flag, FNONBLOCK, relaxed);
+ tmp = 0;
+ (void)fo_ioctl(fp, FIONBIO, (caddr_t)&tmp, &context);
+ goto out;
+
+ case F_GETOWN:
+ if (fp->f_type == DTYPE_SOCKET) {
+ *retval = ((struct socket *)fp->f_data)->so_pgid;
+ error = 0;
+ goto out;
+ }
+ error = fo_ioctl(fp, TIOCGPGRP, (caddr_t)retval, &context);
+ *retval = -*retval;
+ goto out;
+
+ case F_SETOWN:
+ tmp = CAST_DOWN_EXPLICIT(pid_t, uap->arg); /* arg is an int, so we won't lose bits */
+ AUDIT_ARG(value32, tmp);
+ if (fp->f_type == DTYPE_SOCKET) {
+ ((struct socket *)fp->f_data)->so_pgid = tmp;
+ error = 0;
+ goto out;
+ }
+ if (fp->f_type == DTYPE_PIPE) {
+ error = fo_ioctl(fp, TIOCSPGRP, (caddr_t)&tmp, &context);
+ goto out;
+ }
+
+ if (tmp <= 0) {
+ tmp = -tmp;
+ } else {
+ proc_t p1 = proc_find(tmp);
+ if (p1 == 0) {
+ error = ESRCH;
+ goto out;
+ }
+ tmp = (int)p1->p_pgrpid;
+ proc_rele(p1);
+ }
+ error = fo_ioctl(fp, TIOCSPGRP, (caddr_t)&tmp, &context);
+ goto out;
+
+ case F_SETNOSIGPIPE:
+ tmp = CAST_DOWN_EXPLICIT(int, uap->arg);
+ if (fp->f_type == DTYPE_SOCKET) {
+#if SOCKETS
+ error = sock_setsockopt((struct socket *)fp->f_data,
+ SOL_SOCKET, SO_NOSIGPIPE, &tmp, sizeof(tmp));
+#else
+ error = EINVAL;
+#endif
+ } else {
+ struct fileglob *fg = fp->fp_glob;
+
+ lck_mtx_lock_spin(&fg->fg_lock);
+ if (tmp) {
+ fg->fg_lflags |= FG_NOSIGPIPE;
+ } else {
+ fg->fg_lflags &= ~FG_NOSIGPIPE;
+ }
+ lck_mtx_unlock(&fg->fg_lock);
+ error = 0;
+ }
+ goto out;
+
+ case F_GETNOSIGPIPE:
+ if (fp->f_type == DTYPE_SOCKET) {
+#if SOCKETS
+ int retsize = sizeof(*retval);
+ error = sock_getsockopt((struct socket *)fp->f_data,
+ SOL_SOCKET, SO_NOSIGPIPE, retval, &retsize);
+#else
+ error = EINVAL;
+#endif
+ } else {
+ *retval = (fp->fp_glob->fg_lflags & FG_NOSIGPIPE) ?
+ 1 : 0;
+ error = 0;
+ }
+ goto out;
+
+ case F_SETCONFINED:
+ /*
+ * If this is the only reference to this fglob in the process
+ * and it's already marked as close-on-fork then mark it as
+ * (immutably) "confined" i.e. any fd that points to it will
+ * forever be close-on-fork, and attempts to use an IPC
+ * mechanism to move the descriptor elsewhere will fail.
+ */
+ if (CAST_DOWN_EXPLICIT(int, uap->arg)) {
+ struct fileglob *fg = fp->fp_glob;
+
+ lck_mtx_lock_spin(&fg->fg_lock);
+ if (fg->fg_lflags & FG_CONFINED) {
+ error = 0;
+ } else if (1 != os_ref_get_count_raw(&fg->fg_count)) {
+ error = EAGAIN; /* go close the dup .. */
+ } else if (UF_FORKCLOSE == (*pop & UF_FORKCLOSE)) {
+ fg->fg_lflags |= FG_CONFINED;
+ error = 0;
+ } else {
+ error = EBADF; /* open without O_CLOFORK? */
+ }
+ lck_mtx_unlock(&fg->fg_lock);
+ } else {
+ /*
+ * Other subsystems may have built on the immutability
+ * of FG_CONFINED; clearing it may be tricky.
+ */
+ error = EPERM; /* immutable */
+ }
+ goto out;
+
+ case F_GETCONFINED:
+ *retval = (fp->fp_glob->fg_lflags & FG_CONFINED) ? 1 : 0;
+ error = 0;
+ goto out;
+
+ case F_SETLKWTIMEOUT:
+ case F_SETLKW:
+ case F_OFD_SETLKWTIMEOUT:
+ case F_OFD_SETLKW:
+ flg |= F_WAIT;
+ OS_FALLTHROUGH;
+
+ case F_SETLK:
+ case F_OFD_SETLK:
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ vp = (struct vnode *)fp->f_data;
+
+ fflag = fp->f_flag;
+ offset = fp->f_offset;
+ proc_fdunlock(p);
+
+ /* Copy in the lock structure */
+ if (F_SETLKWTIMEOUT == uap->cmd ||
+ F_OFD_SETLKWTIMEOUT == uap->cmd) {
+ error = copyin(argp, (caddr_t) &fltimeout, sizeof(fltimeout));
+ if (error) {
+ goto outdrop;
+ }
+ fl = fltimeout.fl;
+ timeout = &fltimeout.timeout;
+ } else {
+ error = copyin(argp, (caddr_t)&fl, sizeof(fl));
+ if (error) {
+ goto outdrop;
+ }
+ }
+
+ /* Check starting byte and ending byte for EOVERFLOW in SEEK_CUR */
+ /* and ending byte for EOVERFLOW in SEEK_SET */
+ error = check_file_seek_range(&fl, offset);
+ if (error) {
+ goto outdrop;
+ }
+
+ if ((error = vnode_getwithref(vp))) {
+ goto outdrop;
+ }
+ if (fl.l_whence == SEEK_CUR) {
+ fl.l_start += offset;
+ }
+
+#if CONFIG_MACF
+ error = mac_file_check_lock(proc_ucred(p), fp->fp_glob,
+ F_SETLK, &fl);
+ if (error) {
+ (void)vnode_put(vp);
+ goto outdrop;
+ }
+#endif
+ switch (uap->cmd) {
+ case F_OFD_SETLK:
+ case F_OFD_SETLKW:
+ case F_OFD_SETLKWTIMEOUT:
+ flg |= F_OFD_LOCK;
+ switch (fl.l_type) {
+ case F_RDLCK:
+ if ((fflag & FREAD) == 0) {
+ error = EBADF;
+ break;
+ }
+ error = VNOP_ADVLOCK(vp, (caddr_t)fp->fp_glob,
+ F_SETLK, &fl, flg, &context, timeout);
+ break;
+ case F_WRLCK:
+ if ((fflag & FWRITE) == 0) {
+ error = EBADF;
+ break;
+ }
+ error = VNOP_ADVLOCK(vp, (caddr_t)fp->fp_glob,
+ F_SETLK, &fl, flg, &context, timeout);
+ break;
+ case F_UNLCK:
+ error = VNOP_ADVLOCK(vp, (caddr_t)fp->fp_glob,
+ F_UNLCK, &fl, F_OFD_LOCK, &context,
+ timeout);
+ break;
+ default:
+ error = EINVAL;
+ break;
+ }
+ if (0 == error &&
+ (F_RDLCK == fl.l_type || F_WRLCK == fl.l_type)) {
+ struct fileglob *fg = fp->fp_glob;
+
+ /*
+ * arrange F_UNLCK on last close (once
+ * set, FG_HAS_OFDLOCK is immutable)
+ */
+ if ((fg->fg_lflags & FG_HAS_OFDLOCK) == 0) {
+ lck_mtx_lock_spin(&fg->fg_lock);
+ fg->fg_lflags |= FG_HAS_OFDLOCK;
+ lck_mtx_unlock(&fg->fg_lock);
+ }
+ }
+ break;
+ default:
+ flg |= F_POSIX;
+ switch (fl.l_type) {
+ case F_RDLCK:
+ if ((fflag & FREAD) == 0) {
+ error = EBADF;
+ break;
+ }
+ // XXX UInt32 unsafe for LP64 kernel
+ os_atomic_or(&p->p_ladvflag, P_LADVLOCK, relaxed);
+ error = VNOP_ADVLOCK(vp, (caddr_t)p,
+ F_SETLK, &fl, flg, &context, timeout);
+ break;
+ case F_WRLCK:
+ if ((fflag & FWRITE) == 0) {
+ error = EBADF;
+ break;
+ }
+ // XXX UInt32 unsafe for LP64 kernel
+ os_atomic_or(&p->p_ladvflag, P_LADVLOCK, relaxed);
+ error = VNOP_ADVLOCK(vp, (caddr_t)p,
+ F_SETLK, &fl, flg, &context, timeout);
+ break;
+ case F_UNLCK:
+ error = VNOP_ADVLOCK(vp, (caddr_t)p,
+ F_UNLCK, &fl, F_POSIX, &context, timeout);
+ break;
+ default:
+ error = EINVAL;
+ break;
+ }
+ break;
+ }
+ (void) vnode_put(vp);
+ goto outdrop;
+
+ case F_GETLK:
+ case F_OFD_GETLK:
+ case F_GETLKPID:
+ case F_OFD_GETLKPID:
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ vp = (struct vnode *)fp->f_data;
+
+ offset = fp->f_offset;
+ proc_fdunlock(p);
+
+ /* Copy in the lock structure */
+ error = copyin(argp, (caddr_t)&fl, sizeof(fl));
+ if (error) {
+ goto outdrop;
+ }
+
+ /* Check starting byte and ending byte for EOVERFLOW in SEEK_CUR */
+ /* and ending byte for EOVERFLOW in SEEK_SET */
+ error = check_file_seek_range(&fl, offset);
+ if (error) {
+ goto outdrop;
+ }
+
+ if ((fl.l_whence == SEEK_SET) && (fl.l_start < 0)) {
+ error = EINVAL;
+ goto outdrop;
+ }
+
+ switch (fl.l_type) {
+ case F_RDLCK:
+ case F_UNLCK:
+ case F_WRLCK:
+ break;
+ default:
+ error = EINVAL;
+ goto outdrop;
+ }
+
+ switch (fl.l_whence) {
+ case SEEK_CUR:
+ case SEEK_SET:
+ case SEEK_END:
+ break;
+ default:
+ error = EINVAL;
+ goto outdrop;
+ }
+
+ if ((error = vnode_getwithref(vp)) == 0) {
+ if (fl.l_whence == SEEK_CUR) {
+ fl.l_start += offset;
+ }
+
+#if CONFIG_MACF
+ error = mac_file_check_lock(proc_ucred(p), fp->fp_glob,
+ uap->cmd, &fl);
+ if (error == 0)
+#endif
+ switch (uap->cmd) {
+ case F_OFD_GETLK:
+ error = VNOP_ADVLOCK(vp, (caddr_t)fp->fp_glob,
+ F_GETLK, &fl, F_OFD_LOCK, &context, NULL);
+ break;
+ case F_OFD_GETLKPID:
+ error = VNOP_ADVLOCK(vp, (caddr_t)fp->fp_glob,
+ F_GETLKPID, &fl, F_OFD_LOCK, &context, NULL);
+ break;
+ default:
+ error = VNOP_ADVLOCK(vp, (caddr_t)p,
+ uap->cmd, &fl, F_POSIX, &context, NULL);
+ break;
+ }
+
+ (void)vnode_put(vp);
+
+ if (error == 0) {
+ error = copyout((caddr_t)&fl, argp, sizeof(fl));
+ }
+ }
+ goto outdrop;
+
+ case F_PREALLOCATE: {
+ fstore_t alloc_struct; /* structure for allocate command */
+ u_int32_t alloc_flags = 0;
+
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
}
- return (error);
+ vp = (struct vnode *)fp->f_data;
+ proc_fdunlock(p);
+
+ /* make sure that we have write permission */
+ if ((fp->f_flag & FWRITE) == 0) {
+ error = EBADF;
+ goto outdrop;
+ }
+
+ error = copyin(argp, (caddr_t)&alloc_struct, sizeof(alloc_struct));
+ if (error) {
+ goto outdrop;
+ }
+
+ /* now set the space allocated to 0 */
+ alloc_struct.fst_bytesalloc = 0;
+
+ /*
+ * Do some simple parameter checking
+ */
+
+ /* set up the flags */
+
+ alloc_flags |= PREALLOCATE;
+
+ if (alloc_struct.fst_flags & F_ALLOCATECONTIG) {
+ alloc_flags |= ALLOCATECONTIG;
+ }
+
+ if (alloc_struct.fst_flags & F_ALLOCATEALL) {
+ alloc_flags |= ALLOCATEALL;
+ }
+
+ /*
+ * Do any position mode specific stuff. The only
+ * position mode supported now is PEOFPOSMODE
+ */
+
+ switch (alloc_struct.fst_posmode) {
+ case F_PEOFPOSMODE:
+ if (alloc_struct.fst_offset != 0) {
+ error = EINVAL;
+ goto outdrop;
+ }
+
+ alloc_flags |= ALLOCATEFROMPEOF;
+ break;
+
+ case F_VOLPOSMODE:
+ if (alloc_struct.fst_offset <= 0) {
+ error = EINVAL;
+ goto outdrop;
+ }
+
+ alloc_flags |= ALLOCATEFROMVOL;
+ break;
+
+ default: {
+ error = EINVAL;
+ goto outdrop;
+ }
+ }
+ if ((error = vnode_getwithref(vp)) == 0) {
+ /*
+ * call allocate to get the space
+ */
+ error = VNOP_ALLOCATE(vp, alloc_struct.fst_length, alloc_flags,
+ &alloc_struct.fst_bytesalloc, alloc_struct.fst_offset,
+ &context);
+ (void)vnode_put(vp);
+
+ error2 = copyout((caddr_t)&alloc_struct, argp, sizeof(alloc_struct));
+
+ if (error == 0) {
+ error = error2;
+ }
+ }
+ goto outdrop;
+ }
+ case F_PUNCHHOLE: {
+ fpunchhole_t args;
+
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+
+ vp = (struct vnode *)fp->f_data;
+ proc_fdunlock(p);
+
+ /* need write permissions */
+ if ((fp->f_flag & FWRITE) == 0) {
+ error = EPERM;
+ goto outdrop;
+ }
+
+ if ((error = copyin(argp, (caddr_t)&args, sizeof(args)))) {
+ goto outdrop;
+ }
+
+ if ((error = vnode_getwithref(vp))) {
+ goto outdrop;
+ }
+
+#if CONFIG_MACF
+ if ((error = mac_vnode_check_write(&context, fp->fp_glob->fg_cred, vp))) {
+ (void)vnode_put(vp);
+ goto outdrop;
+ }
+#endif
+
+ error = VNOP_IOCTL(vp, F_PUNCHHOLE, (caddr_t)&args, 0, &context);
+ (void)vnode_put(vp);
+
+ goto outdrop;
+ }
+ case F_TRIM_ACTIVE_FILE: {
+ ftrimactivefile_t args;
+
+ if (priv_check_cred(kauth_cred_get(), PRIV_TRIM_ACTIVE_FILE, 0)) {
+ error = EACCES;
+ goto out;
+ }
+
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+
+ vp = (struct vnode *)fp->f_data;
+ proc_fdunlock(p);
+
+ /* need write permissions */
+ if ((fp->f_flag & FWRITE) == 0) {
+ error = EPERM;
+ goto outdrop;
+ }
+
+ if ((error = copyin(argp, (caddr_t)&args, sizeof(args)))) {
+ goto outdrop;
+ }
+
+ if ((error = vnode_getwithref(vp))) {
+ goto outdrop;
+ }
+
+ error = VNOP_IOCTL(vp, F_TRIM_ACTIVE_FILE, (caddr_t)&args, 0, &context);
+ (void)vnode_put(vp);
+
+ goto outdrop;
+ }
+ case F_SPECULATIVE_READ: {
+ fspecread_t args;
+
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+
+ vp = (struct vnode *)fp->f_data;
+ proc_fdunlock(p);
+
+ if ((error = copyin(argp, (caddr_t)&args, sizeof(args)))) {
+ goto outdrop;
+ }
+
+ /* Discard invalid offsets or lengths */
+ if ((args.fsr_offset < 0) || (args.fsr_length < 0)) {
+ error = EINVAL;
+ goto outdrop;
+ }
+
+ /*
+ * Round the file offset down to a page-size boundary (or to 0).
+ * The filesystem will need to round the length up to the end of the page boundary
+ * or to the EOF of the file.
+ */
+ uint64_t foff = (((uint64_t)args.fsr_offset) & ~((uint64_t)PAGE_MASK));
+ uint64_t foff_delta = args.fsr_offset - foff;
+ args.fsr_offset = (off_t) foff;
+
+ /*
+ * Now add in the delta to the supplied length. Since we may have adjusted the
+ * offset, increase it by the amount that we adjusted.
+ */
+ args.fsr_length += foff_delta;
+
+ if ((error = vnode_getwithref(vp))) {
+ goto outdrop;
+ }
+ error = VNOP_IOCTL(vp, F_SPECULATIVE_READ, (caddr_t)&args, 0, &context);
+ (void)vnode_put(vp);
+
+ goto outdrop;
+ }
+ case F_SETSIZE:
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ vp = (struct vnode *)fp->f_data;
+ proc_fdunlock(p);
+
+ error = copyin(argp, (caddr_t)&offset, sizeof(off_t));
+ if (error) {
+ goto outdrop;
+ }
+ AUDIT_ARG(value64, offset);
+
+ error = vnode_getwithref(vp);
+ if (error) {
+ goto outdrop;
+ }
+
+#if CONFIG_MACF
+ error = mac_vnode_check_truncate(&context,
+ fp->fp_glob->fg_cred, vp);
+ if (error) {
+ (void)vnode_put(vp);
+ goto outdrop;
+ }
+#endif
+ /*
+ * Make sure that we are root. Growing a file
+ * without zero filling the data is a security hole.
+ */
+ if (!kauth_cred_issuser(kauth_cred_get())) {
+ error = EACCES;
+ } else {
+ /*
+ * Require privilege to change file size without zerofill,
+ * else will change the file size and zerofill it.
+ */
+ error = priv_check_cred(kauth_cred_get(), PRIV_VFS_SETSIZE, 0);
+ if (error == 0) {
+ error = vnode_setsize(vp, offset, IO_NOZEROFILL, &context);
+ } else {
+ error = vnode_setsize(vp, offset, 0, &context);
+ }
+
+#if CONFIG_MACF
+ if (error == 0) {
+ mac_vnode_notify_truncate(&context, fp->fp_glob->fg_cred, vp);
+ }
+#endif
+ }
+
+ (void)vnode_put(vp);
+ goto outdrop;
+
+ case F_RDAHEAD:
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ if (uap->arg) {
+ os_atomic_andnot(&fp->fp_glob->fg_flag, FNORDAHEAD, relaxed);
+ } else {
+ os_atomic_or(&fp->fp_glob->fg_flag, FNORDAHEAD, relaxed);
+ }
+ goto out;
+
+ case F_NOCACHE:
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ if (uap->arg) {
+ os_atomic_or(&fp->fp_glob->fg_flag, FNOCACHE, relaxed);
+ } else {
+ os_atomic_andnot(&fp->fp_glob->fg_flag, FNOCACHE, relaxed);
+ }
+ goto out;
+
+ case F_NODIRECT:
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ if (uap->arg) {
+ os_atomic_or(&fp->fp_glob->fg_flag, FNODIRECT, relaxed);
+ } else {
+ os_atomic_andnot(&fp->fp_glob->fg_flag, FNODIRECT, relaxed);
+ }
+ goto out;
+
+ case F_SINGLE_WRITER:
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ if (uap->arg) {
+ os_atomic_or(&fp->fp_glob->fg_flag, FSINGLE_WRITER, relaxed);
+ } else {
+ os_atomic_andnot(&fp->fp_glob->fg_flag, FSINGLE_WRITER, relaxed);
+ }
+ goto out;
+
+ case F_GLOBAL_NOCACHE:
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ vp = (struct vnode *)fp->f_data;
+ proc_fdunlock(p);
+
+ if ((error = vnode_getwithref(vp)) == 0) {
+ *retval = vnode_isnocache(vp);
+
+ if (uap->arg) {
+ vnode_setnocache(vp);
+ } else {
+ vnode_clearnocache(vp);
+ }
+
+ (void)vnode_put(vp);
+ }
+ goto outdrop;
+
+ case F_CHECK_OPENEVT:
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ vp = (struct vnode *)fp->f_data;
+ proc_fdunlock(p);
+
+ if ((error = vnode_getwithref(vp)) == 0) {
+ *retval = vnode_is_openevt(vp);
+
+ if (uap->arg) {
+ vnode_set_openevt(vp);
+ } else {
+ vnode_clear_openevt(vp);
+ }
+
+ (void)vnode_put(vp);
+ }
+ goto outdrop;
+
+ case F_RDADVISE: {
+ struct radvisory ra_struct;
+
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ vp = (struct vnode *)fp->f_data;
+ proc_fdunlock(p);
+
+ if ((error = copyin(argp, (caddr_t)&ra_struct, sizeof(ra_struct)))) {
+ goto outdrop;
+ }
+ if (ra_struct.ra_offset < 0 || ra_struct.ra_count < 0) {
+ error = EINVAL;
+ goto outdrop;
+ }
+ if ((error = vnode_getwithref(vp)) == 0) {
+ error = VNOP_IOCTL(vp, F_RDADVISE, (caddr_t)&ra_struct, 0, &context);
+
+ (void)vnode_put(vp);
+ }
+ goto outdrop;
+ }
+
+ case F_FLUSH_DATA:
+
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ vp = (struct vnode *)fp->f_data;
+ proc_fdunlock(p);
+
+ if ((error = vnode_getwithref(vp)) == 0) {
+ error = VNOP_FSYNC(vp, MNT_NOWAIT, &context);
+
+ (void)vnode_put(vp);
+ }
+ goto outdrop;
+
+ case F_LOG2PHYS:
+ case F_LOG2PHYS_EXT: {
+ struct log2phys l2p_struct = {}; /* structure for allocate command */
+ int devBlockSize;
+
+ off_t file_offset = 0;
+ size_t a_size = 0;
+ size_t run = 0;
+
+ if (uap->cmd == F_LOG2PHYS_EXT) {
+ error = copyin(argp, (caddr_t)&l2p_struct, sizeof(l2p_struct));
+ if (error) {
+ goto out;
+ }
+ file_offset = l2p_struct.l2p_devoffset;
+ } else {
+ file_offset = fp->f_offset;
+ }
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ vp = (struct vnode *)fp->f_data;
+ proc_fdunlock(p);
+ if ((error = vnode_getwithref(vp))) {
+ goto outdrop;
+ }
+ error = VNOP_OFFTOBLK(vp, file_offset, &lbn);
+ if (error) {
+ (void)vnode_put(vp);
+ goto outdrop;
+ }
+ error = VNOP_BLKTOOFF(vp, lbn, &offset);
+ if (error) {
+ (void)vnode_put(vp);
+ goto outdrop;
+ }
+ devBlockSize = vfs_devblocksize(vnode_mount(vp));
+ if (uap->cmd == F_LOG2PHYS_EXT) {
+ if (l2p_struct.l2p_contigbytes < 0) {
+ vnode_put(vp);
+ error = EINVAL;
+ goto outdrop;
+ }
+
+ a_size = (size_t)MIN((uint64_t)l2p_struct.l2p_contigbytes, SIZE_MAX);
+ } else {
+ a_size = devBlockSize;
+ }
+
+ error = VNOP_BLOCKMAP(vp, offset, a_size, &bn, &run, NULL, 0, &context);
+
+ (void)vnode_put(vp);
+
+ if (!error) {
+ l2p_struct.l2p_flags = 0; /* for now */
+ if (uap->cmd == F_LOG2PHYS_EXT) {
+ l2p_struct.l2p_contigbytes = run - (file_offset - offset);
+ } else {
+ l2p_struct.l2p_contigbytes = 0; /* for now */
+ }
+
+ /*
+ * The block number being -1 suggests that the file offset is not backed
+ * by any real blocks on-disk. As a result, just let it be passed back up wholesale.
+ */
+ if (bn == -1) {
+ /* Don't multiply it by the block size */
+ l2p_struct.l2p_devoffset = bn;
+ } else {
+ l2p_struct.l2p_devoffset = bn * devBlockSize;
+ l2p_struct.l2p_devoffset += file_offset - offset;
+ }
+ error = copyout((caddr_t)&l2p_struct, argp, sizeof(l2p_struct));
+ }
+ goto outdrop;
+ }
+ case F_GETPATH:
+ case F_GETPATH_NOFIRMLINK: {
+ char *pathbufp;
+ int pathlen;
+
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ vp = (struct vnode *)fp->f_data;
+ proc_fdunlock(p);
+
+ pathlen = MAXPATHLEN;
+ MALLOC(pathbufp, char *, pathlen, M_TEMP, M_WAITOK);
+ if (pathbufp == NULL) {
+ error = ENOMEM;
+ goto outdrop;
+ }
+ if ((error = vnode_getwithref(vp)) == 0) {
+ if (uap->cmd == F_GETPATH_NOFIRMLINK) {
+ error = vn_getpath_ext(vp, NULL, pathbufp, &pathlen, VN_GETPATH_NO_FIRMLINK);
+ } else {
+ error = vn_getpath(vp, pathbufp, &pathlen);
+ }
+ (void)vnode_put(vp);
+
+ if (error == 0) {
+ error = copyout((caddr_t)pathbufp, argp, pathlen);
+ }
+ }
+ FREE(pathbufp, M_TEMP);
+ goto outdrop;
+ }
+
+ case F_PATHPKG_CHECK: {
+ char *pathbufp;
+ size_t pathlen;
+
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ vp = (struct vnode *)fp->f_data;
+ proc_fdunlock(p);
+
+ pathlen = MAXPATHLEN;
+ pathbufp = zalloc(ZV_NAMEI);
+
+ if ((error = copyinstr(argp, pathbufp, MAXPATHLEN, &pathlen)) == 0) {
+ if ((error = vnode_getwithref(vp)) == 0) {
+ AUDIT_ARG(text, pathbufp);
+ error = vn_path_package_check(vp, pathbufp, (int)pathlen, retval);
+
+ (void)vnode_put(vp);
+ }
+ }
+ zfree(ZV_NAMEI, pathbufp);
+ goto outdrop;
+ }
+
+ case F_CHKCLEAN: // used by regression tests to see if all dirty pages got cleaned by fsync()
+ case F_FULLFSYNC: // fsync + flush the journal + DKIOCSYNCHRONIZE
+ case F_BARRIERFSYNC: // fsync + barrier
+ case F_FREEZE_FS: // freeze all other fs operations for the fs of this fd
+ case F_THAW_FS: { // thaw all frozen fs operations for the fs of this fd
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ vp = (struct vnode *)fp->f_data;
+ proc_fdunlock(p);
+
+ if ((error = vnode_getwithref(vp)) == 0) {
+ error = VNOP_IOCTL(vp, uap->cmd, (caddr_t)NULL, 0, &context);
+
+ (void)vnode_put(vp);
+ }
+ break;
+ }
+
+ /*
+ * SPI (private) for opening a file starting from a dir fd
+ */
+ case F_OPENFROM: {
+ struct user_fopenfrom fopen;
+ struct vnode_attr va;
+ struct nameidata nd;
+ int cmode;
+
+ /* Check if this isn't a valid file descriptor */
+ if ((fp->f_type != DTYPE_VNODE) ||
+ (fp->f_flag & FREAD) == 0) {
+ error = EBADF;
+ goto out;
+ }
+ vp = (struct vnode *)fp->f_data;
+ proc_fdunlock(p);
+
+ if (vnode_getwithref(vp)) {
+ error = ENOENT;
+ goto outdrop;
+ }
+
+ /* Only valid for directories */
+ if (vp->v_type != VDIR) {
+ vnode_put(vp);
+ error = ENOTDIR;
+ goto outdrop;
+ }
+
+ /*
+ * Only entitled apps may use the credentials of the thread
+ * that opened the file descriptor.
+ * Non-entitled threads will use their own context.
+ */
+ if (IOTaskHasEntitlement(current_task(), ACCOUNT_OPENFROM_ENTITLEMENT)) {
+ has_entitlement = 1;
+ }
+
+ /* Get flags, mode and pathname arguments. */
+ if (IS_64BIT_PROCESS(p)) {
+ error = copyin(argp, &fopen, sizeof(fopen));
+ } else {
+ struct user32_fopenfrom fopen32;
+
+ error = copyin(argp, &fopen32, sizeof(fopen32));
+ fopen.o_flags = fopen32.o_flags;
+ fopen.o_mode = fopen32.o_mode;
+ fopen.o_pathname = CAST_USER_ADDR_T(fopen32.o_pathname);
+ }
+ if (error) {
+ vnode_put(vp);
+ goto outdrop;
+ }
+ AUDIT_ARG(fflags, fopen.o_flags);
+ AUDIT_ARG(mode, fopen.o_mode);
+ VATTR_INIT(&va);
+ /* Mask off all but regular access permissions */
+ cmode = ((fopen.o_mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT;
+ VATTR_SET(&va, va_mode, cmode & ACCESSPERMS);
+
+ /* Start the lookup relative to the file descriptor's vnode. */
+ NDINIT(&nd, LOOKUP, OP_OPEN, USEDVP | FOLLOW | AUDITVNPATH1, UIO_USERSPACE,
+ fopen.o_pathname, has_entitlement ? &context : vfs_context_current());
+ nd.ni_dvp = vp;
+
+ error = open1(has_entitlement ? &context : vfs_context_current(),
+ &nd, fopen.o_flags, &va, fileproc_alloc_init, NULL, retval);
+
+ vnode_put(vp);
+ break;
+ }
+ /*
+ * SPI (private) for unlinking a file starting from a dir fd
+ */
+ case F_UNLINKFROM: {
+ user_addr_t pathname;
+
+ /* Check if this isn't a valid file descriptor */
+ if ((fp->f_type != DTYPE_VNODE) ||
+ (fp->f_flag & FREAD) == 0) {
+ error = EBADF;
+ goto out;
+ }
+ vp = (struct vnode *)fp->f_data;
+ proc_fdunlock(p);
+
+ if (vnode_getwithref(vp)) {
+ error = ENOENT;
+ goto outdrop;
+ }
+
+ /* Only valid for directories */
+ if (vp->v_type != VDIR) {
+ vnode_put(vp);
+ error = ENOTDIR;
+ goto outdrop;
+ }
+
+ /*
+ * Only entitled apps may use the credentials of the thread
+ * that opened the file descriptor.
+ * Non-entitled threads will use their own context.
+ */
+ if (IOTaskHasEntitlement(current_task(), ACCOUNT_OPENFROM_ENTITLEMENT)) {
+ has_entitlement = 1;
+ }
+
+ /* Get flags, mode and pathname arguments. */
+ if (IS_64BIT_PROCESS(p)) {
+ pathname = (user_addr_t)argp;
+ } else {
+ pathname = CAST_USER_ADDR_T(argp);
+ }
+
+ /* Start the lookup relative to the file descriptor's vnode. */
+ error = unlink1(has_entitlement ? &context : vfs_context_current(),
+ vp, pathname, UIO_USERSPACE, 0);
+
+ vnode_put(vp);
+ break;
+ }
+
+ case F_ADDSIGS:
+ case F_ADDFILESIGS:
+ case F_ADDFILESIGS_FOR_DYLD_SIM:
+ case F_ADDFILESIGS_RETURN:
+ case F_ADDFILESIGS_INFO:
+ {
+ struct cs_blob *blob = NULL;
+ struct user_fsignatures fs;
+ kern_return_t kr;
+ vm_offset_t kernel_blob_addr;
+ vm_size_t kernel_blob_size;
+ int blob_add_flags = 0;
+ const size_t sizeof_fs = (uap->cmd == F_ADDFILESIGS_INFO ?
+ offsetof(struct user_fsignatures, fs_cdhash /* first output element */) :
+ offsetof(struct user_fsignatures, fs_fsignatures_size /* compat */));
+
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ vp = (struct vnode *)fp->f_data;
+ proc_fdunlock(p);
+
+ if (uap->cmd == F_ADDFILESIGS_FOR_DYLD_SIM) {
+ blob_add_flags |= MAC_VNODE_CHECK_DYLD_SIM;
+ if ((p->p_csflags & CS_KILL) == 0) {
+ proc_lock(p);
+ p->p_csflags |= CS_KILL;
+ proc_unlock(p);
+ }
+ }
+
+ error = vnode_getwithref(vp);
+ if (error) {
+ goto outdrop;
+ }
+
+ if (IS_64BIT_PROCESS(p)) {
+ error = copyin(argp, &fs, sizeof_fs);
+ } else {
+ if (uap->cmd == F_ADDFILESIGS_INFO) {
+ error = EINVAL;
+ vnode_put(vp);
+ goto outdrop;
+ }
+
+ struct user32_fsignatures fs32;
+
+ error = copyin(argp, &fs32, sizeof(fs32));
+ fs.fs_file_start = fs32.fs_file_start;
+ fs.fs_blob_start = CAST_USER_ADDR_T(fs32.fs_blob_start);
+ fs.fs_blob_size = fs32.fs_blob_size;
+ }
+
+ if (error) {
+ vnode_put(vp);
+ goto outdrop;
+ }
+
+ /*
+ * First check if we have something loaded a this offset
+ */
+ blob = ubc_cs_blob_get(vp, CPU_TYPE_ANY, CPU_SUBTYPE_ANY, fs.fs_file_start);
+ if (blob != NULL) {
+ /* If this is for dyld_sim revalidate the blob */
+ if (uap->cmd == F_ADDFILESIGS_FOR_DYLD_SIM) {
+ error = ubc_cs_blob_revalidate(vp, blob, NULL, blob_add_flags, proc_platform(p));
+ if (error) {
+ blob = NULL;
+ if (error != EAGAIN) {
+ vnode_put(vp);
+ goto outdrop;
+ }
+ }
+ }
+ }
+
+ if (blob == NULL) {
+ /*
+ * An arbitrary limit, to prevent someone from mapping in a 20GB blob. This should cover
+ * our use cases for the immediate future, but note that at the time of this commit, some
+ * platforms are nearing 2MB blob sizes (with a prior soft limit of 2.5MB).
+ *
+ * We should consider how we can manage this more effectively; the above means that some
+ * platforms are using megabytes of memory for signing data; it merely hasn't crossed the
+ * threshold considered ridiculous at the time of this change.
+ */
+#define CS_MAX_BLOB_SIZE (40ULL * 1024ULL * 1024ULL)
+ if (fs.fs_blob_size > CS_MAX_BLOB_SIZE) {
+ error = E2BIG;
+ vnode_put(vp);
+ goto outdrop;
+ }
+
+ kernel_blob_size = CAST_DOWN(vm_size_t, fs.fs_blob_size);
+ kr = ubc_cs_blob_allocate(&kernel_blob_addr, &kernel_blob_size);
+ if (kr != KERN_SUCCESS || kernel_blob_size < fs.fs_blob_size) {
+ error = ENOMEM;
+ vnode_put(vp);
+ goto outdrop;
+ }
+
+ if (uap->cmd == F_ADDSIGS) {
+ error = copyin(fs.fs_blob_start,
+ (void *) kernel_blob_addr,
+ fs.fs_blob_size);
+ } else { /* F_ADDFILESIGS || F_ADDFILESIGS_RETURN || F_ADDFILESIGS_FOR_DYLD_SIM || F_ADDFILESIGS_INFO */
+ int resid;
+
+ error = vn_rdwr(UIO_READ,
+ vp,
+ (caddr_t) kernel_blob_addr,
+ (int)kernel_blob_size,
+ fs.fs_file_start + fs.fs_blob_start,
+ UIO_SYSSPACE,
+ 0,
+ kauth_cred_get(),
+ &resid,
+ p);
+ if ((error == 0) && resid) {
+ /* kernel_blob_size rounded to a page size, but signature may be at end of file */
+ memset((void *)(kernel_blob_addr + (kernel_blob_size - resid)), 0x0, resid);
+ }
+ }
+
+ if (error) {
+ ubc_cs_blob_deallocate(kernel_blob_addr,
+ kernel_blob_size);
+ vnode_put(vp);
+ goto outdrop;
+ }
+
+ blob = NULL;
+ error = ubc_cs_blob_add(vp,
+ proc_platform(p),
+ CPU_TYPE_ANY, /* not for a specific architecture */
+ CPU_SUBTYPE_ANY,
+ fs.fs_file_start,
+ &kernel_blob_addr,
+ kernel_blob_size,
+ NULL,
+ blob_add_flags,
+ &blob);
+
+ /* ubc_blob_add() has consumed "kernel_blob_addr" if it is zeroed */
+ if (error) {
+ if (kernel_blob_addr) {
+ ubc_cs_blob_deallocate(kernel_blob_addr,
+ kernel_blob_size);
+ }
+ vnode_put(vp);
+ goto outdrop;
+ } else {
+#if CHECK_CS_VALIDATION_BITMAP
+ ubc_cs_validation_bitmap_allocate( vp );
+#endif
+ }
+ }
+
+ if (uap->cmd == F_ADDFILESIGS_RETURN || uap->cmd == F_ADDFILESIGS_FOR_DYLD_SIM ||
+ uap->cmd == F_ADDFILESIGS_INFO) {
+ /*
+ * The first element of the structure is a
+ * off_t that happen to have the same size for
+ * all archs. Lets overwrite that.
+ */
+ off_t end_offset = 0;
+ if (blob) {
+ end_offset = blob->csb_end_offset;
+ }
+ error = copyout(&end_offset, argp, sizeof(end_offset));
+
+ if (error) {
+ vnode_put(vp);
+ goto outdrop;
+ }
+ }
+
+ if (uap->cmd == F_ADDFILESIGS_INFO) {
+ /* Return information. What we copy out depends on the size of the
+ * passed in structure, to keep binary compatibility. */
+
+ if (fs.fs_fsignatures_size >= sizeof(struct user_fsignatures)) {
+ // enough room for fs_cdhash[20]+fs_hash_type
+
+ if (blob != NULL) {
+ error = copyout(blob->csb_cdhash,
+ (vm_address_t)argp + offsetof(struct user_fsignatures, fs_cdhash),
+ USER_FSIGNATURES_CDHASH_LEN);
+ if (error) {
+ vnode_put(vp);
+ goto outdrop;
+ }
+ int hashtype = cs_hash_type(blob->csb_hashtype);
+ error = copyout(&hashtype,
+ (vm_address_t)argp + offsetof(struct user_fsignatures, fs_hash_type),
+ sizeof(int));
+ if (error) {
+ vnode_put(vp);
+ goto outdrop;
+ }
+ }
+ }
+ }
+
+ (void) vnode_put(vp);
+ break;
+ }
+#if CONFIG_SUPPLEMENTAL_SIGNATURES
+ case F_ADDFILESUPPL:
+ {
+ struct vnode *ivp;
+ struct cs_blob *blob = NULL;
+ struct user_fsupplement fs;
+ int orig_fd;
+ struct fileproc* orig_fp = NULL;
+ kern_return_t kr;
+ vm_offset_t kernel_blob_addr;
+ vm_size_t kernel_blob_size;
+
+ if (!IS_64BIT_PROCESS(p)) {
+ error = EINVAL;
+ goto out; // drop fp and unlock fds
+ }
+
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+
+ error = copyin(argp, &fs, sizeof(fs));
+ if (error) {
+ goto out;
+ }
+
+ orig_fd = fs.fs_orig_fd;
+ if ((error = fp_lookup(p, orig_fd, &orig_fp, 1))) {
+ printf("CODE SIGNING: Failed to find original file for supplemental signature attachment\n");
+ goto out;
+ }
+
+ if (orig_fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ fp_drop(p, orig_fd, orig_fp, 1);
+ goto out;
+ }
+
+ ivp = (struct vnode *)orig_fp->f_data;
+
+ vp = (struct vnode *)fp->f_data;
+
+ proc_fdunlock(p);
+
+ error = vnode_getwithref(ivp);
+ if (error) {
+ fp_drop(p, orig_fd, orig_fp, 0);
+ goto outdrop; //drop fp
+ }
+
+ error = vnode_getwithref(vp);
+ if (error) {
+ vnode_put(ivp);
+ fp_drop(p, orig_fd, orig_fp, 0);
+ goto outdrop;
+ }
+
+ if (fs.fs_blob_size > CS_MAX_BLOB_SIZE) {
+ error = E2BIG;
+ goto dropboth; // drop iocounts on vp and ivp, drop orig_fp then drop fp via outdrop
+ }
+
+ kernel_blob_size = CAST_DOWN(vm_size_t, fs.fs_blob_size);
+ kr = ubc_cs_blob_allocate(&kernel_blob_addr, &kernel_blob_size);
+ if (kr != KERN_SUCCESS) {
+ error = ENOMEM;
+ goto dropboth;
+ }
+
+ int resid;
+ error = vn_rdwr(UIO_READ, vp,
+ (caddr_t)kernel_blob_addr, (int)kernel_blob_size,
+ fs.fs_file_start + fs.fs_blob_start,
+ UIO_SYSSPACE, 0,
+ kauth_cred_get(), &resid, p);
+ if ((error == 0) && resid) {
+ /* kernel_blob_size rounded to a page size, but signature may be at end of file */
+ memset((void *)(kernel_blob_addr + (kernel_blob_size - resid)), 0x0, resid);
+ }
+
+ if (error) {
+ ubc_cs_blob_deallocate(kernel_blob_addr,
+ kernel_blob_size);
+ goto dropboth;
+ }
+
+ error = ubc_cs_blob_add_supplement(vp, ivp, fs.fs_file_start,
+ &kernel_blob_addr, kernel_blob_size, &blob);
+
+ /* ubc_blob_add_supplement() has consumed kernel_blob_addr if it is zeroed */
+ if (error) {
+ if (kernel_blob_addr) {
+ ubc_cs_blob_deallocate(kernel_blob_addr,
+ kernel_blob_size);
+ }
+ goto dropboth;
+ }
+ vnode_put(ivp);
+ vnode_put(vp);
+ fp_drop(p, orig_fd, orig_fp, 0);
+ break;
+
+dropboth:
+ vnode_put(ivp);
+ vnode_put(vp);
+ fp_drop(p, orig_fd, orig_fp, 0);
+ goto outdrop;
+ }
+#endif
+ case F_GETCODEDIR:
+ case F_FINDSIGS: {
+ error = ENOTSUP;
+ goto out;
+ }
+ case F_CHECK_LV: {
+ struct fileglob *fg;
+ fchecklv_t lv = {};
+
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ fg = fp->fp_glob;
+ proc_fdunlock(p);
+
+ if (IS_64BIT_PROCESS(p)) {
+ error = copyin(argp, &lv, sizeof(lv));
+ } else {
+ struct user32_fchecklv lv32 = {};
+
+ error = copyin(argp, &lv32, sizeof(lv32));
+ lv.lv_file_start = lv32.lv_file_start;
+ lv.lv_error_message = (void *)(uintptr_t)lv32.lv_error_message;
+ lv.lv_error_message_size = lv32.lv_error_message_size;
+ }
+ if (error) {
+ goto outdrop;
+ }
+
+#if CONFIG_MACF
+ error = mac_file_check_library_validation(p, fg, lv.lv_file_start,
+ (user_long_t)lv.lv_error_message, lv.lv_error_message_size);
+#endif
+
+ break;
+ }
+ case F_GETSIGSINFO: {
+ struct cs_blob *blob = NULL;
+ fgetsigsinfo_t sigsinfo = {};
+
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ vp = (struct vnode *)fp->f_data;
+ proc_fdunlock(p);
+
+ error = vnode_getwithref(vp);
+ if (error) {
+ goto outdrop;
+ }
+
+ error = copyin(argp, &sigsinfo, sizeof(sigsinfo));
+ if (error) {
+ vnode_put(vp);
+ goto outdrop;
+ }
+
+ blob = ubc_cs_blob_get(vp, CPU_TYPE_ANY, CPU_SUBTYPE_ANY, sigsinfo.fg_file_start);
+ if (blob == NULL) {
+ error = ENOENT;
+ vnode_put(vp);
+ goto outdrop;
+ }
+ switch (sigsinfo.fg_info_request) {
+ case GETSIGSINFO_PLATFORM_BINARY:
+ sigsinfo.fg_sig_is_platform = blob->csb_platform_binary;
+ error = copyout(&sigsinfo.fg_sig_is_platform,
+ (vm_address_t)argp + offsetof(struct fgetsigsinfo, fg_sig_is_platform),
+ sizeof(sigsinfo.fg_sig_is_platform));
+ if (error) {
+ vnode_put(vp);
+ goto outdrop;
+ }
+ break;
+ default:
+ error = EINVAL;
+ vnode_put(vp);
+ goto outdrop;
+ }
+ vnode_put(vp);
+ break;
+ }
+#if CONFIG_PROTECT
+ case F_GETPROTECTIONCLASS: {
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ vp = (struct vnode *)fp->f_data;
+
+ proc_fdunlock(p);
+
+ if (vnode_getwithref(vp)) {
+ error = ENOENT;
+ goto outdrop;
+ }
+
+ struct vnode_attr va;
+
+ VATTR_INIT(&va);
+ VATTR_WANTED(&va, va_dataprotect_class);
+ error = VNOP_GETATTR(vp, &va, &context);
+ if (!error) {
+ if (VATTR_IS_SUPPORTED(&va, va_dataprotect_class)) {
+ *retval = va.va_dataprotect_class;
+ } else {
+ error = ENOTSUP;
+ }
+ }
+
+ vnode_put(vp);
+ break;
+ }
+
+ case F_SETPROTECTIONCLASS: {
+ /* tmp must be a valid PROTECTION_CLASS_* */
+ tmp = CAST_DOWN_EXPLICIT(uint32_t, uap->arg);
+
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ vp = (struct vnode *)fp->f_data;
+
+ proc_fdunlock(p);
+
+ if (vnode_getwithref(vp)) {
+ error = ENOENT;
+ goto outdrop;
+ }
+
+ /* Only go forward if you have write access */
+ vfs_context_t ctx = vfs_context_current();
+ if (vnode_authorize(vp, NULLVP, (KAUTH_VNODE_ACCESS | KAUTH_VNODE_WRITE_DATA), ctx) != 0) {
+ vnode_put(vp);
+ error = EBADF;
+ goto outdrop;
+ }
+
+ struct vnode_attr va;
+
+ VATTR_INIT(&va);
+ VATTR_SET(&va, va_dataprotect_class, tmp);
+
+ error = VNOP_SETATTR(vp, &va, ctx);
+
+ vnode_put(vp);
+ break;
+ }
+
+ case F_TRANSCODEKEY: {
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+
+ vp = (struct vnode *)fp->f_data;
+ proc_fdunlock(p);
+
+ if (vnode_getwithref(vp)) {
+ error = ENOENT;
+ goto outdrop;
+ }
+
+ cp_key_t k = {
+ .len = CP_MAX_WRAPPEDKEYSIZE,
+ };
+
+ MALLOC(k.key, char *, k.len, M_TEMP, M_WAITOK | M_ZERO);
+
+ error = VNOP_IOCTL(vp, F_TRANSCODEKEY, (caddr_t)&k, 1, &context);
+
+ vnode_put(vp);
+
+ if (error == 0) {
+ error = copyout(k.key, argp, k.len);
+ *retval = k.len;
+ }
+
+ FREE(k.key, M_TEMP);
+
+ break;
+ }
+
+ case F_GETPROTECTIONLEVEL: {
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+
+ vp = (struct vnode*) fp->f_data;
+ proc_fdunlock(p);
+
+ if (vnode_getwithref(vp)) {
+ error = ENOENT;
+ goto outdrop;
+ }
+
+ error = VNOP_IOCTL(vp, F_GETPROTECTIONLEVEL, (caddr_t)retval, 0, &context);
+
+ vnode_put(vp);
+ break;
+ }
+
+ case F_GETDEFAULTPROTLEVEL: {
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+
+ vp = (struct vnode*) fp->f_data;
+ proc_fdunlock(p);
+
+ if (vnode_getwithref(vp)) {
+ error = ENOENT;
+ goto outdrop;
+ }
+
+ /*
+ * if cp_get_major_vers fails, error will be set to proper errno
+ * and cp_version will still be 0.
+ */
+
+ error = VNOP_IOCTL(vp, F_GETDEFAULTPROTLEVEL, (caddr_t)retval, 0, &context);
+
+ vnode_put(vp);
+ break;
+ }
+
+#endif /* CONFIG_PROTECT */
+
+ case F_MOVEDATAEXTENTS: {
+ struct fileproc *fp2 = NULL;
+ struct vnode *src_vp = NULLVP;
+ struct vnode *dst_vp = NULLVP;
+ /* We need to grab the 2nd FD out of the argments before moving on. */
+ int fd2 = CAST_DOWN_EXPLICIT(int32_t, uap->arg);
+
+ error = priv_check_cred(kauth_cred_get(), PRIV_VFS_MOVE_DATA_EXTENTS, 0);
+ if (error) {
+ goto out;
+ }
+
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+
+ /*
+ * For now, special case HFS+ and APFS only, since this
+ * is SPI.
+ */
+ src_vp = (struct vnode *)fp->f_data;
+ if (src_vp->v_tag != VT_HFS && src_vp->v_tag != VT_APFS) {
+ error = ENOTSUP;
+ goto out;
+ }
+
+ /*
+ * Get the references before we start acquiring iocounts on the vnodes,
+ * while we still hold the proc fd lock
+ */
+ if ((error = fp_lookup(p, fd2, &fp2, 1))) {
+ error = EBADF;
+ goto out;
+ }
+ if (fp2->f_type != DTYPE_VNODE) {
+ fp_drop(p, fd2, fp2, 1);
+ error = EBADF;
+ goto out;
+ }
+ dst_vp = (struct vnode *)fp2->f_data;
+ if (dst_vp->v_tag != VT_HFS && dst_vp->v_tag != VT_APFS) {
+ fp_drop(p, fd2, fp2, 1);
+ error = ENOTSUP;
+ goto out;
+ }
+
+#if CONFIG_MACF
+ /* Re-do MAC checks against the new FD, pass in a fake argument */
+ error = mac_file_check_fcntl(proc_ucred(p), fp2->fp_glob, uap->cmd, 0);
+ if (error) {
+ fp_drop(p, fd2, fp2, 1);
+ goto out;
+ }
+#endif
+ /* Audit the 2nd FD */
+ AUDIT_ARG(fd, fd2);
+
+ proc_fdunlock(p);
+
+ if (vnode_getwithref(src_vp)) {
+ fp_drop(p, fd2, fp2, 0);
+ error = ENOENT;
+ goto outdrop;
+ }
+ if (vnode_getwithref(dst_vp)) {
+ vnode_put(src_vp);
+ fp_drop(p, fd2, fp2, 0);
+ error = ENOENT;
+ goto outdrop;
+ }
+
+ /*
+ * Basic asserts; validate they are not the same and that
+ * both live on the same filesystem.
+ */
+ if (dst_vp == src_vp) {
+ vnode_put(src_vp);
+ vnode_put(dst_vp);
+ fp_drop(p, fd2, fp2, 0);
+ error = EINVAL;
+ goto outdrop;
+ }
+
+ if (dst_vp->v_mount != src_vp->v_mount) {
+ vnode_put(src_vp);
+ vnode_put(dst_vp);
+ fp_drop(p, fd2, fp2, 0);
+ error = EXDEV;
+ goto outdrop;
+ }
+
+ /* Now we have a legit pair of FDs. Go to work */
+
+ /* Now check for write access to the target files */
+ if (vnode_authorize(src_vp, NULLVP,
+ (KAUTH_VNODE_ACCESS | KAUTH_VNODE_WRITE_DATA), &context) != 0) {
+ vnode_put(src_vp);
+ vnode_put(dst_vp);
+ fp_drop(p, fd2, fp2, 0);
+ error = EBADF;
+ goto outdrop;
+ }
+
+ if (vnode_authorize(dst_vp, NULLVP,
+ (KAUTH_VNODE_ACCESS | KAUTH_VNODE_WRITE_DATA), &context) != 0) {
+ vnode_put(src_vp);
+ vnode_put(dst_vp);
+ fp_drop(p, fd2, fp2, 0);
+ error = EBADF;
+ goto outdrop;
+ }
+
+ /* Verify that both vps point to files and not directories */
+ if (!vnode_isreg(src_vp) || !vnode_isreg(dst_vp)) {
+ error = EINVAL;
+ vnode_put(src_vp);
+ vnode_put(dst_vp);
+ fp_drop(p, fd2, fp2, 0);
+ goto outdrop;
+ }
+
+ /*
+ * The exchangedata syscall handler passes in 0 for the flags to VNOP_EXCHANGE.
+ * We'll pass in our special bit indicating that the new behavior is expected
+ */
+
+ error = VNOP_EXCHANGE(src_vp, dst_vp, FSOPT_EXCHANGE_DATA_ONLY, &context);
+
+ vnode_put(src_vp);
+ vnode_put(dst_vp);
+ fp_drop(p, fd2, fp2, 0);
+ break;
+ }
+
+ /*
+ * SPI for making a file compressed.
+ */
+ case F_MAKECOMPRESSED: {
+ uint32_t gcounter = CAST_DOWN_EXPLICIT(uint32_t, uap->arg);
+
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+
+ vp = (struct vnode*) fp->f_data;
+ proc_fdunlock(p);
+
+ /* get the vnode */
+ if (vnode_getwithref(vp)) {
+ error = ENOENT;
+ goto outdrop;
+ }
+
+ /* Is it a file? */
+ if ((vnode_isreg(vp) == 0) && (vnode_islnk(vp) == 0)) {
+ vnode_put(vp);
+ error = EBADF;
+ goto outdrop;
+ }
+
+ /* invoke ioctl to pass off to FS */
+ /* Only go forward if you have write access */
+ vfs_context_t ctx = vfs_context_current();
+ if (vnode_authorize(vp, NULLVP, (KAUTH_VNODE_ACCESS | KAUTH_VNODE_WRITE_DATA), ctx) != 0) {
+ vnode_put(vp);
+ error = EBADF;
+ goto outdrop;
+ }
+
+ error = VNOP_IOCTL(vp, uap->cmd, (caddr_t)&gcounter, 0, &context);
+
+ vnode_put(vp);
+ break;
+ }
+
+ /*
+ * SPI (private) for indicating to a filesystem that subsequent writes to
+ * the open FD will written to the Fastflow.
+ */
+ case F_SET_GREEDY_MODE:
+ /* intentionally drop through to the same handler as F_SETSTATIC.
+ * both fcntls should pass the argument and their selector into VNOP_IOCTL.
+ */
+
+ /*
+ * SPI (private) for indicating to a filesystem that subsequent writes to
+ * the open FD will represent static content.
+ */
+ case F_SETSTATICCONTENT: {
+ caddr_t ioctl_arg = NULL;
+
+ if (uap->arg) {
+ ioctl_arg = (caddr_t) 1;
+ }
+
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ vp = (struct vnode *)fp->f_data;
+ proc_fdunlock(p);
+
+ error = vnode_getwithref(vp);
+ if (error) {
+ error = ENOENT;
+ goto outdrop;
+ }
+
+ /* Only go forward if you have write access */
+ vfs_context_t ctx = vfs_context_current();
+ if (vnode_authorize(vp, NULLVP, (KAUTH_VNODE_ACCESS | KAUTH_VNODE_WRITE_DATA), ctx) != 0) {
+ vnode_put(vp);
+ error = EBADF;
+ goto outdrop;
+ }
+
+ error = VNOP_IOCTL(vp, uap->cmd, ioctl_arg, 0, &context);
+ (void)vnode_put(vp);
+
+ break;
+ }
+
+ /*
+ * SPI (private) for indicating to the lower level storage driver that the
+ * subsequent writes should be of a particular IO type (burst, greedy, static),
+ * or other flavors that may be necessary.
+ */
+ case F_SETIOTYPE: {
+ caddr_t param_ptr;
+ uint32_t param;
+
+ if (uap->arg) {
+ /* extract 32 bits of flags from userland */
+ param_ptr = (caddr_t) uap->arg;
+ param = (uint32_t) param_ptr;
+ } else {
+ /* If no argument is specified, error out */
+ error = EINVAL;
+ goto out;
+ }
+
+ /*
+ * Validate the different types of flags that can be specified:
+ * all of them are mutually exclusive for now.
+ */
+ switch (param) {
+ case F_IOTYPE_ISOCHRONOUS:
+ break;
+
+ default:
+ error = EINVAL;
+ goto out;
+ }
+
+
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ vp = (struct vnode *)fp->f_data;
+ proc_fdunlock(p);
+
+ error = vnode_getwithref(vp);
+ if (error) {
+ error = ENOENT;
+ goto outdrop;
+ }
+
+ /* Only go forward if you have write access */
+ vfs_context_t ctx = vfs_context_current();
+ if (vnode_authorize(vp, NULLVP, (KAUTH_VNODE_ACCESS | KAUTH_VNODE_WRITE_DATA), ctx) != 0) {
+ vnode_put(vp);
+ error = EBADF;
+ goto outdrop;
+ }
+
+ error = VNOP_IOCTL(vp, uap->cmd, param_ptr, 0, &context);
+ (void)vnode_put(vp);
+
+ break;
+ }
+
+ /*
+ * Set the vnode pointed to by 'fd'
+ * and tag it as the (potentially future) backing store
+ * for another filesystem
+ */
+ case F_SETBACKINGSTORE: {
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+
+ vp = (struct vnode *)fp->f_data;
+
+ if (vp->v_tag != VT_HFS) {
+ error = EINVAL;
+ goto out;
+ }
+ proc_fdunlock(p);
+
+ if (vnode_getwithref(vp)) {
+ error = ENOENT;
+ goto outdrop;
+ }
+
+ /* only proceed if you have write access */
+ vfs_context_t ctx = vfs_context_current();
+ if (vnode_authorize(vp, NULLVP, (KAUTH_VNODE_ACCESS | KAUTH_VNODE_WRITE_DATA), ctx) != 0) {
+ vnode_put(vp);
+ error = EBADF;
+ goto outdrop;
+ }
+
+
+ /* If arg != 0, set, otherwise unset */
+ if (uap->arg) {
+ error = VNOP_IOCTL(vp, uap->cmd, (caddr_t)1, 0, &context);
+ } else {
+ error = VNOP_IOCTL(vp, uap->cmd, (caddr_t)NULL, 0, &context);
+ }
+
+ vnode_put(vp);
+ break;
+ }
+
+ /*
+ * like F_GETPATH, but special semantics for
+ * the mobile time machine handler.
+ */
+ case F_GETPATH_MTMINFO: {
+ char *pathbufp;
+ int pathlen;
+
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ vp = (struct vnode *)fp->f_data;
+ proc_fdunlock(p);
+
+ pathlen = MAXPATHLEN;
+ MALLOC(pathbufp, char *, pathlen, M_TEMP, M_WAITOK);
+ if (pathbufp == NULL) {
+ error = ENOMEM;
+ goto outdrop;
+ }
+ if ((error = vnode_getwithref(vp)) == 0) {
+ int backingstore = 0;
+
+ /* Check for error from vn_getpath before moving on */
+ if ((error = vn_getpath(vp, pathbufp, &pathlen)) == 0) {
+ if (vp->v_tag == VT_HFS) {
+ error = VNOP_IOCTL(vp, uap->cmd, (caddr_t) &backingstore, 0, &context);
+ }
+ (void)vnode_put(vp);
+
+ if (error == 0) {
+ error = copyout((caddr_t)pathbufp, argp, pathlen);
+ }
+ if (error == 0) {
+ /*
+ * If the copyout was successful, now check to ensure
+ * that this vnode is not a BACKINGSTORE vnode. mtmd
+ * wants the path regardless.
+ */
+ if (backingstore) {
+ error = EBUSY;
+ }
+ }
+ } else {
+ (void)vnode_put(vp);
+ }
+ }
+ FREE(pathbufp, M_TEMP);
+ goto outdrop;
+ }
+
+#if DEBUG || DEVELOPMENT
+ case F_RECYCLE:
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ vp = (struct vnode *)fp->f_data;
+ proc_fdunlock(p);
+
+ vnode_recycle(vp);
+ break;
+#endif
+
+ default:
+ /*
+ * This is an fcntl() that we d not recognize at this level;
+ * if this is a vnode, we send it down into the VNOP_IOCTL
+ * for this vnode; this can include special devices, and will
+ * effectively overload fcntl() to send ioctl()'s.
+ */
+ if ((uap->cmd & IOC_VOID) && (uap->cmd & IOC_INOUT)) {
+ error = EINVAL;
+ goto out;
+ }
+
+ /* Catch any now-invalid fcntl() selectors */
+ switch (uap->cmd) {
+ case (int)APFSIOC_REVERT_TO_SNAPSHOT:
+ case (int)FSIOC_FIOSEEKHOLE:
+ case (int)FSIOC_FIOSEEKDATA:
+ case (int)FSIOC_CAS_BSDFLAGS:
+ case HFS_GET_BOOT_INFO:
+ case HFS_SET_BOOT_INFO:
+ case FIOPINSWAP:
+ case F_MARKDEPENDENCY:
+ case TIOCREVOKE:
+ case TIOCREVOKECLEAR:
+ error = EINVAL;
+ goto out;
+ default:
+ break;
+ }
+
+ if (fp->f_type != DTYPE_VNODE) {
+ error = EBADF;
+ goto out;
+ }
+ vp = (struct vnode *)fp->f_data;
+ proc_fdunlock(p);
+
+ if ((error = vnode_getwithref(vp)) == 0) {
+#define STK_PARAMS 128
+ char stkbuf[STK_PARAMS] = {0};
+ unsigned int size;
+ caddr_t data, memp;
+ /*
+ * For this to work properly, we have to copy in the
+ * ioctl() cmd argument if there is one; we must also
+ * check that a command parameter, if present, does
+ * not exceed the maximum command length dictated by
+ * the number of bits we have available in the command
+ * to represent a structure length. Finally, we have
+ * to copy the results back out, if it is that type of
+ * ioctl().
+ */
+ size = IOCPARM_LEN(uap->cmd);
+ if (size > IOCPARM_MAX) {
+ (void)vnode_put(vp);
+ error = EINVAL;
+ break;
+ }
+
+ memp = NULL;
+ if (size > sizeof(stkbuf)) {
+ memp = (caddr_t)kheap_alloc(KHEAP_TEMP, size, Z_WAITOK);
+ if (memp == 0) {
+ (void)vnode_put(vp);
+ error = ENOMEM;
+ goto outdrop;
+ }
+ data = memp;
+ } else {
+ data = &stkbuf[0];
+ }
+
+ if (uap->cmd & IOC_IN) {
+ if (size) {
+ /* structure */
+ error = copyin(argp, data, size);
+ if (error) {
+ (void)vnode_put(vp);
+ if (memp) {
+ kheap_free(KHEAP_TEMP, memp, size);
+ }
+ goto outdrop;
+ }
+
+ /* Bzero the section beyond that which was needed */
+ if (size <= sizeof(stkbuf)) {
+ bzero((((uint8_t*)data) + size), (sizeof(stkbuf) - size));
+ }
+ } else {
+ /* int */
+ if (is64bit) {
+ *(user_addr_t *)data = argp;
+ } else {
+ *(uint32_t *)data = (uint32_t)argp;
+ }
+ };
+ } else if ((uap->cmd & IOC_OUT) && size) {
+ /*
+ * Zero the buffer so the user always
+ * gets back something deterministic.
+ */
+ bzero(data, size);
+ } else if (uap->cmd & IOC_VOID) {
+ if (is64bit) {
+ *(user_addr_t *)data = argp;
+ } else {
+ *(uint32_t *)data = (uint32_t)argp;
+ }
+ }
+
+ error = VNOP_IOCTL(vp, uap->cmd, CAST_DOWN(caddr_t, data), 0, &context);
+
+ (void)vnode_put(vp);
+
+ /* Copy any output data to user */
+ if (error == 0 && (uap->cmd & IOC_OUT) && size) {
+ error = copyout(data, argp, size);
+ }
+ if (memp) {
+ kheap_free(KHEAP_TEMP, memp, size);
+ }
+ }
+ break;
+ }
+
+outdrop:
+ AUDIT_ARG(vnpath_withref, vp, ARG_VNODE1);
+ fp_drop(p, fd, fp, 0);
+ return error;
+out:
+ fp_drop(p, fd, fp, 1);
+ proc_fdunlock(p);
+ return error;
+}
+
+
+/*
+ * finishdup
+ *
+ * Description: Common code for dup, dup2, and fcntl(F_DUPFD).
+ *
+ * Parameters: p Process performing the dup
+ * old The fd to dup
+ * new The fd to dup it to
+ * fd_flags Flags to augment the new fd
+ * retval Pointer to the call return area
+ *
+ * Returns: 0 Success
+ * EBADF
+ * ENOMEM
+ *
+ * Implicit returns:
+ * *retval (modified) The new descriptor
+ *
+ * Locks: Assumes proc_fdlock for process pointing to fdp is held by
+ * the caller
+ *
+ * Notes: This function may drop and reacquire this lock; it is unsafe
+ * for a caller to assume that other state protected by the lock
+ * has not been subsequently changed out from under it.
+ */
+int
+finishdup(proc_t p,
+ struct filedesc *fdp, int old, int new, int fd_flags, int32_t *retval)
+{
+ struct fileproc *nfp;
+ struct fileproc *ofp;
+#if CONFIG_MACF
+ int error;
+#endif
+
+#if DIAGNOSTIC
+ proc_fdlock_assert(p, LCK_MTX_ASSERT_OWNED);
+#endif
+ if ((ofp = fdp->fd_ofiles[old]) == NULL ||
+ (fdp->fd_ofileflags[old] & UF_RESERVED)) {
+ fdrelse(p, new);
+ return EBADF;
+ }
+
+#if CONFIG_MACF
+ error = mac_file_check_dup(proc_ucred(p), ofp->fp_glob, new);
+ if (error) {
+ fdrelse(p, new);
+ return error;
+ }
+#endif
+
+ proc_fdunlock(p);
+
+ nfp = fileproc_alloc_init(NULL);
+
+ proc_fdlock(p);
+
+ if (nfp == NULL) {
+ fdrelse(p, new);
+ return ENOMEM;
+ }
+
+ fg_ref(p, ofp->fp_glob);
+ nfp->fp_glob = ofp->fp_glob;
+
+#if DIAGNOSTIC
+ if (fdp->fd_ofiles[new] != 0) {
+ panic("finishdup: overwriting fd_ofiles with new %d", new);
+ }
+ if ((fdp->fd_ofileflags[new] & UF_RESERVED) == 0) {
+ panic("finishdup: unreserved fileflags with new %d", new);
+ }
+#endif
+
+ if (new > fdp->fd_lastfile) {
+ fdp->fd_lastfile = new;
+ }
+ *fdflags(p, new) |= fd_flags;
+ procfdtbl_releasefd(p, new, nfp);
+ *retval = new;
+ return 0;
+}
+
+
+/*
+ * sys_close
+ *
+ * Description: The implementation of the close(2) system call
+ *
+ * Parameters: p Process in whose per process file table
+ * the close is to occur
+ * uap->fd fd to be closed
+ * retval <unused>
+ *
+ * Returns: 0 Success
+ * fp_lookup:EBADF Bad file descriptor
+ * fp_guard_exception:??? Guarded file descriptor
+ * close_internal:EBADF
+ * close_internal:??? Anything returnable by a per-fileops
+ * close function
+ */
+int
+sys_close(proc_t p, struct close_args *uap, __unused int32_t *retval)
+{
+ __pthread_testcancel(1);
+ return close_nocancel(p, uap->fd);
+}
+
+int
+sys_close_nocancel(proc_t p, struct close_nocancel_args *uap, __unused int32_t *retval)
+{
+ return close_nocancel(p, uap->fd);
+}
+
+int
+close_nocancel(proc_t p, int fd)
+{
+ struct fileproc *fp;
+
+ AUDIT_SYSCLOSE(p, fd);
+
+ proc_fdlock(p);
+ if ((fp = fp_get_noref_locked(p, fd)) == NULL) {
+ proc_fdunlock(p);
+ return EBADF;
+ }
+
+ if (FP_ISGUARDED(fp, GUARD_CLOSE)) {
+ int error = fp_guard_exception(p, fd, fp, kGUARD_EXC_CLOSE);
+ proc_fdunlock(p);
+ return error;
+ }
+
+ return fp_close_and_unlock(p, fd, fp, 0);
+}
+
+
+int
+fp_close_and_unlock(proc_t p, int fd, struct fileproc *fp, int flags)
+{
+ struct filedesc *fdp = p->p_fd;
+ struct fileglob *fg = fp->fp_glob;
+
+#if DIAGNOSTIC
+ proc_fdlock_assert(p, LCK_MTX_ASSERT_OWNED);
+#endif
+
+ /*
+ * Keep most people from finding the filedesc while we are closing it.
+ *
+ * Callers are:
+ *
+ * - dup2() which always waits for UF_RESERVED to clear
+ *
+ * - close/guarded_close/... who will fail the fileproc lookup if
+ * UF_RESERVED is set,
+ *
+ * - fdexec()/fdfree() who only run once all threads in the proc
+ * are properly canceled, hence no fileproc in this proc should
+ * be in flux.
+ *
+ * Which means that neither UF_RESERVED nor UF_CLOSING should be set.
+ *
+ * Callers of fp_get_noref_locked_with_iocount() can still find
+ * this entry so that they can drop their I/O reference despite
+ * not having remembered the fileproc pointer (namely select() and
+ * file_drop()).
+ */
+ if (p->p_fd->fd_ofileflags[fd] & (UF_RESERVED | UF_CLOSING)) {
+ panic("%s: called with fileproc in flux (%d/:%p)",
+ __func__, fd, fp);
+ }
+ p->p_fd->fd_ofileflags[fd] |= (UF_RESERVED | UF_CLOSING);
+
+ if ((fp->fp_flags & FP_AIOISSUED) || kauth_authorize_fileop_has_listeners()) {
+ proc_fdunlock(p);
+
+ if ((FILEGLOB_DTYPE(fg) == DTYPE_VNODE) && kauth_authorize_fileop_has_listeners()) {
+ /*
+ * call out to allow 3rd party notification of close.
+ * Ignore result of kauth_authorize_fileop call.
+ */
+ if (vnode_getwithref((vnode_t)fg->fg_data) == 0) {
+ u_int fileop_flags = 0;
+ if (fg->fg_flag & FWASWRITTEN) {
+ fileop_flags |= KAUTH_FILEOP_CLOSE_MODIFIED;
+ }
+ kauth_authorize_fileop(fg->fg_cred, KAUTH_FILEOP_CLOSE,
+ (uintptr_t)fg->fg_data, (uintptr_t)fileop_flags);
+#if CONFIG_MACF
+ mac_file_notify_close(proc_ucred(p), fp->fp_glob);
+#endif
+ vnode_put((vnode_t)fg->fg_data);
+ }
+ }
+ if (fp->fp_flags & FP_AIOISSUED) {
+ /*
+ * cancel all async IO requests that can be cancelled.
+ */
+ _aio_close( p, fd );
+ }
+
+ proc_fdlock(p);
+ }
+
+ if (fd < fdp->fd_knlistsize) {
+ knote_fdclose(p, fd);
+ }
+
+ fileproc_drain(p, fp);
+
+ if (flags & FD_DUP2RESV) {
+ fdp->fd_ofiles[fd] = NULL;
+ fdp->fd_ofileflags[fd] &= ~(UF_CLOSING | UF_EXCLOSE | UF_FORKCLOSE);
+ } else {
+ fdrelse(p, fd);
+ }
+
+ proc_fdunlock(p);
+
+ if (ENTR_SHOULDTRACE && FILEGLOB_DTYPE(fg) == DTYPE_SOCKET) {
+ KERNEL_ENERGYTRACE(kEnTrActKernSocket, DBG_FUNC_END,
+ fd, 0, (int64_t)VM_KERNEL_ADDRPERM(fg->fg_data));
+ }
+
+ fileproc_free(fp);
+
+ return fg_drop(p, fg);
+}
+
+
+/*
+ * fstat
+ *
+ * Description: Return status information about a file descriptor.
+ *
+ * Parameters: p The process doing the fstat
+ * fd The fd to stat
+ * ub The user stat buffer
+ * xsecurity The user extended security
+ * buffer, or 0 if none
+ * xsecurity_size The size of xsecurity, or 0
+ * if no xsecurity
+ * isstat64 Flag to indicate 64 bit version
+ * for inode size, etc.
+ *
+ * Returns: 0 Success
+ * EBADF
+ * EFAULT
+ * fp_lookup:EBADF Bad file descriptor
+ * vnode_getwithref:???
+ * copyout:EFAULT
+ * vnode_getwithref:???
+ * vn_stat:???
+ * soo_stat:???
+ * pipe_stat:???
+ * pshm_stat:???
+ * kqueue_stat:???
+ *
+ * Notes: Internal implementation for all other fstat() related
+ * functions
+ *
+ * XXX switch on node type is bogus; need a stat in struct
+ * XXX fileops instead.
+ */
+static int
+fstat(proc_t p, int fd, user_addr_t ub, user_addr_t xsecurity, user_addr_t xsecurity_size, int isstat64)
+{
+ struct fileproc *fp;
+ union {
+ struct stat sb;
+ struct stat64 sb64;
+ } source;
+ union {
+ struct user64_stat user64_sb;
+ struct user32_stat user32_sb;
+ struct user64_stat64 user64_sb64;
+ struct user32_stat64 user32_sb64;
+ } dest;
+ int error, my_size;
+ file_type_t type;
+ caddr_t data;
+ kauth_filesec_t fsec;
+ user_size_t xsecurity_bufsize;
+ vfs_context_t ctx = vfs_context_current();
+ void * sbptr;
+
+
+ AUDIT_ARG(fd, fd);
+
+ if ((error = fp_lookup(p, fd, &fp, 0)) != 0) {
+ return error;
+ }
+ type = fp->f_type;
+ data = fp->f_data;
+ fsec = KAUTH_FILESEC_NONE;
+
+ sbptr = (void *)&source;
+
+ switch (type) {
+ case DTYPE_VNODE:
+ if ((error = vnode_getwithref((vnode_t)data)) == 0) {
+ /*
+ * If the caller has the file open, and is not
+ * requesting extended security information, we are
+ * going to let them get the basic stat information.
+ */
+ if (xsecurity == USER_ADDR_NULL) {
+ error = vn_stat_noauth((vnode_t)data, sbptr, NULL, isstat64, 0, ctx,
+ fp->fp_glob->fg_cred);
+ } else {
+ error = vn_stat((vnode_t)data, sbptr, &fsec, isstat64, 0, ctx);
+ }
+
+ AUDIT_ARG(vnpath, (struct vnode *)data, ARG_VNODE1);
+ (void)vnode_put((vnode_t)data);
+ }
+ break;
+
+#if SOCKETS
+ case DTYPE_SOCKET:
+ error = soo_stat((struct socket *)data, sbptr, isstat64);
+ break;
+#endif /* SOCKETS */
+
+ case DTYPE_PIPE:
+ error = pipe_stat((void *)data, sbptr, isstat64);
+ break;
+
+ case DTYPE_PSXSHM:
+ error = pshm_stat((void *)data, sbptr, isstat64);
+ break;
+
+ case DTYPE_KQUEUE:
+ error = kqueue_stat((void *)data, sbptr, isstat64, p);
+ break;
+
+ default:
+ error = EBADF;
+ goto out;
+ }
+ if (error == 0) {
+ caddr_t sbp;
+
+ if (isstat64 != 0) {
+ source.sb64.st_lspare = 0;
+ source.sb64.st_qspare[0] = 0LL;
+ source.sb64.st_qspare[1] = 0LL;
+
+ if (IS_64BIT_PROCESS(current_proc())) {
+ munge_user64_stat64(&source.sb64, &dest.user64_sb64);
+ my_size = sizeof(dest.user64_sb64);
+ sbp = (caddr_t)&dest.user64_sb64;
+ } else {
+ munge_user32_stat64(&source.sb64, &dest.user32_sb64);
+ my_size = sizeof(dest.user32_sb64);
+ sbp = (caddr_t)&dest.user32_sb64;
+ }
+ } else {
+ source.sb.st_lspare = 0;
+ source.sb.st_qspare[0] = 0LL;
+ source.sb.st_qspare[1] = 0LL;
+ if (IS_64BIT_PROCESS(current_proc())) {
+ munge_user64_stat(&source.sb, &dest.user64_sb);
+ my_size = sizeof(dest.user64_sb);
+ sbp = (caddr_t)&dest.user64_sb;
+ } else {
+ munge_user32_stat(&source.sb, &dest.user32_sb);
+ my_size = sizeof(dest.user32_sb);
+ sbp = (caddr_t)&dest.user32_sb;
+ }
+ }
+
+ error = copyout(sbp, ub, my_size);
+ }
+
+ /* caller wants extended security information? */
+ if (xsecurity != USER_ADDR_NULL) {
+ /* did we get any? */
+ if (fsec == KAUTH_FILESEC_NONE) {
+ if (susize(xsecurity_size, 0) != 0) {
+ error = EFAULT;
+ goto out;
+ }
+ } else {
+ /* find the user buffer size */
+ xsecurity_bufsize = fusize(xsecurity_size);
+
+ /* copy out the actual data size */
+ if (susize(xsecurity_size, KAUTH_FILESEC_COPYSIZE(fsec)) != 0) {
+ error = EFAULT;
+ goto out;
+ }
+
+ /* if the caller supplied enough room, copy out to it */
+ if (xsecurity_bufsize >= KAUTH_FILESEC_COPYSIZE(fsec)) {
+ error = copyout(fsec, xsecurity, KAUTH_FILESEC_COPYSIZE(fsec));
+ }
+ }
+ }
+out:
+ fp_drop(p, fd, fp, 0);
+ if (fsec != NULL) {
+ kauth_filesec_free(fsec);
+ }
+ return error;
+}
+
+
+/*
+ * sys_fstat_extended
+ *
+ * Description: Extended version of fstat supporting returning extended
+ * security information
+ *
+ * Parameters: p The process doing the fstat
+ * uap->fd The fd to stat
+ * uap->ub The user stat buffer
+ * uap->xsecurity The user extended security
+ * buffer, or 0 if none
+ * uap->xsecurity_size The size of xsecurity, or 0
+ *
+ * Returns: 0 Success
+ * !0 Errno (see fstat)
+ */
+int
+sys_fstat_extended(proc_t p, struct fstat_extended_args *uap, __unused int32_t *retval)
+{
+ return fstat(p, uap->fd, uap->ub, uap->xsecurity, uap->xsecurity_size, 0);
+}
+
+
+/*
+ * sys_fstat
+ *
+ * Description: Get file status for the file associated with fd
+ *
+ * Parameters: p The process doing the fstat
+ * uap->fd The fd to stat
+ * uap->ub The user stat buffer
+ *
+ * Returns: 0 Success
+ * !0 Errno (see fstat)
+ */
+int
+sys_fstat(proc_t p, struct fstat_args *uap, __unused int32_t *retval)
+{
+ return fstat(p, uap->fd, uap->ub, 0, 0, 0);
+}
+
+
+/*
+ * sys_fstat64_extended
+ *
+ * Description: Extended version of fstat64 supporting returning extended
+ * security information
+ *
+ * Parameters: p The process doing the fstat
+ * uap->fd The fd to stat
+ * uap->ub The user stat buffer
+ * uap->xsecurity The user extended security
+ * buffer, or 0 if none
+ * uap->xsecurity_size The size of xsecurity, or 0
+ *
+ * Returns: 0 Success
+ * !0 Errno (see fstat)
+ */
+int
+sys_fstat64_extended(proc_t p, struct fstat64_extended_args *uap, __unused int32_t *retval)
+{
+ return fstat(p, uap->fd, uap->ub, uap->xsecurity, uap->xsecurity_size, 1);
+}
+
+
+/*
+ * sys_fstat64
+ *
+ * Description: Get 64 bit version of the file status for the file associated
+ * with fd
+ *
+ * Parameters: p The process doing the fstat
+ * uap->fd The fd to stat
+ * uap->ub The user stat buffer
+ *
+ * Returns: 0 Success
+ * !0 Errno (see fstat)
+ */
+int
+sys_fstat64(proc_t p, struct fstat64_args *uap, __unused int32_t *retval)
+{
+ return fstat(p, uap->fd, uap->ub, 0, 0, 1);
+}
+
+
+/*
+ * sys_fpathconf
+ *
+ * Description: Return pathconf information about a file descriptor.
+ *
+ * Parameters: p Process making the request
+ * uap->fd fd to get information about
+ * uap->name Name of information desired
+ * retval Pointer to the call return area
+ *
+ * Returns: 0 Success
+ * EINVAL
+ * fp_lookup:EBADF Bad file descriptor
+ * vnode_getwithref:???
+ * vn_pathconf:???
+ *
+ * Implicit returns:
+ * *retval (modified) Returned information (numeric)
+ */
+int
+sys_fpathconf(proc_t p, struct fpathconf_args *uap, int32_t *retval)
+{
+ int fd = uap->fd;
+ struct fileproc *fp;
+ struct vnode *vp;
+ int error = 0;
+ file_type_t type;
+ caddr_t data;
+
+
+ AUDIT_ARG(fd, uap->fd);
+ if ((error = fp_lookup(p, fd, &fp, 0))) {
+ return error;
+ }
+ type = fp->f_type;
+ data = fp->f_data;
+
+ switch (type) {
+ case DTYPE_SOCKET:
+ if (uap->name != _PC_PIPE_BUF) {
+ error = EINVAL;
+ goto out;
+ }
+ *retval = PIPE_BUF;
+ error = 0;
+ goto out;
+
+ case DTYPE_PIPE:
+ if (uap->name != _PC_PIPE_BUF) {
+ error = EINVAL;
+ goto out;
+ }
+ *retval = PIPE_BUF;
+ error = 0;
+ goto out;
+
+ case DTYPE_VNODE:
+ vp = (struct vnode *)data;
+
+ if ((error = vnode_getwithref(vp)) == 0) {
+ AUDIT_ARG(vnpath, vp, ARG_VNODE1);
+
+ error = vn_pathconf(vp, uap->name, retval, vfs_context_current());
+
+ (void)vnode_put(vp);
+ }
+ goto out;
+
+ default:
+ error = EINVAL;
+ goto out;
+ }
+ /*NOTREACHED*/
+out:
+ fp_drop(p, fd, fp, 0);
+ return error;
+}
+
+/*
+ * Statistics counter for the number of times a process calling fdalloc()
+ * has resulted in an expansion of the per process open file table.
+ *
+ * XXX This would likely be of more use if it were per process
+ */
+int fdexpand;
+
+
+/*
+ * fdalloc
+ *
+ * Description: Allocate a file descriptor for the process.
+ *
+ * Parameters: p Process to allocate the fd in
+ * want The fd we would prefer to get
+ * result Pointer to fd we got
+ *
+ * Returns: 0 Success
+ * EMFILE
+ * ENOMEM
+ *
+ * Implicit returns:
+ * *result (modified) The fd which was allocated
+ */
+int
+fdalloc(proc_t p, int want, int *result)
+{
+ struct filedesc *fdp = p->p_fd;
+ int i;
+ int last, numfiles, oldnfiles;
+ struct fileproc **newofiles, **ofiles;
+ char *newofileflags;
+ rlim_t lim;
+ rlim_t nofile = proc_limitgetcur(p, RLIMIT_NOFILE, TRUE);
+
+ nofile = MIN(nofile, INT_MAX);
+
+ /*
+ * Search for a free descriptor starting at the higher
+ * of want or fd_freefile. If that fails, consider
+ * expanding the ofile array.
+ */
+#if DIAGNOSTIC
+ proc_fdlock_assert(p, LCK_MTX_ASSERT_OWNED);
+#endif
+
+ lim = MIN(nofile, maxfilesperproc);
+ for (;;) {
+ last = (int)MIN((unsigned int)fdp->fd_nfiles, (unsigned int)lim);
+ if ((i = want) < fdp->fd_freefile) {
+ i = fdp->fd_freefile;
+ }
+ for (; i < last; i++) {
+ if (fdp->fd_ofiles[i] == NULL && !(fdp->fd_ofileflags[i] & UF_RESERVED)) {
+ procfdtbl_reservefd(p, i);
+ if (i > fdp->fd_lastfile) {
+ fdp->fd_lastfile = i;
+ }
+ if (want <= fdp->fd_freefile) {
+ fdp->fd_freefile = i;
+ }
+ *result = i;
+ return 0;
+ }
+ }
+
+ /*
+ * No space in current array. Expand?
+ */
+ if ((rlim_t)fdp->fd_nfiles >= lim) {
+ return EMFILE;
+ }
+ if (fdp->fd_nfiles < NDEXTENT) {
+ numfiles = NDEXTENT;
+ } else {
+ numfiles = 2 * fdp->fd_nfiles;
+ }
+ /* Enforce lim */
+ if ((rlim_t)numfiles > lim) {
+ numfiles = (int)lim;
+ }
+ proc_fdunlock(p);
+ MALLOC(newofiles, struct fileproc **,
+ numfiles * OFILESIZE, M_OFILETABL, M_WAITOK);
+ proc_fdlock(p);
+ if (newofiles == NULL) {
+ return ENOMEM;
+ }
+ if (fdp->fd_nfiles >= numfiles) {
+ FREE(newofiles, M_OFILETABL);
+ continue;
+ }
+ newofileflags = (char *) &newofiles[numfiles];
+ /*
+ * Copy the existing ofile and ofileflags arrays
+ * and zero the new portion of each array.
+ */
+ oldnfiles = fdp->fd_nfiles;
+ (void) memcpy(newofiles, fdp->fd_ofiles,
+ oldnfiles * sizeof(*fdp->fd_ofiles));
+ (void) memset(&newofiles[oldnfiles], 0,
+ (numfiles - oldnfiles) * sizeof(*fdp->fd_ofiles));
+
+ (void) memcpy(newofileflags, fdp->fd_ofileflags,
+ oldnfiles * sizeof(*fdp->fd_ofileflags));
+ (void) memset(&newofileflags[oldnfiles], 0,
+ (numfiles - oldnfiles) *
+ sizeof(*fdp->fd_ofileflags));
+ ofiles = fdp->fd_ofiles;
+ fdp->fd_ofiles = newofiles;
+ fdp->fd_ofileflags = newofileflags;
+ fdp->fd_nfiles = numfiles;
+ FREE(ofiles, M_OFILETABL);
+ fdexpand++;
+ }
+}
+
+
+/*
+ * fdavail
+ *
+ * Description: Check to see whether n user file descriptors are available
+ * to the process p.
+ *
+ * Parameters: p Process to check in
+ * n The number of fd's desired
+ *
+ * Returns: 0 No
+ * 1 Yes
+ *
+ * Locks: Assumes proc_fdlock for process is held by the caller
+ *
+ * Notes: The answer only remains valid so long as the proc_fdlock is
+ * held by the caller.
+ */
+int
+fdavail(proc_t p, int n)
+{
+ struct filedesc *fdp = p->p_fd;
+ struct fileproc **fpp;
+ char *flags;
+ int i;
+ int lim;
+ rlim_t nofile = proc_limitgetcur(p, RLIMIT_NOFILE, TRUE);
+
+ lim = (int)MIN(nofile, maxfilesperproc);
+ if ((i = lim - fdp->fd_nfiles) > 0 && (n -= i) <= 0) {
+ return 1;
+ }
+ fpp = &fdp->fd_ofiles[fdp->fd_freefile];
+ flags = &fdp->fd_ofileflags[fdp->fd_freefile];
+ for (i = fdp->fd_nfiles - fdp->fd_freefile; --i >= 0; fpp++, flags++) {
+ if (*fpp == NULL && !(*flags & UF_RESERVED) && --n <= 0) {
+ return 1;
+ }
+ }
+ return 0;
+}
+
+
+struct fileproc *
+fp_get_noref_locked(proc_t p, int fd)
+{
+ struct filedesc *fdp = p->p_fd;
+ struct fileproc *fp;
+
+ if (fd < 0 || fd >= fdp->fd_nfiles ||
+ (fp = fdp->fd_ofiles[fd]) == NULL ||
+ (fdp->fd_ofileflags[fd] & UF_RESERVED)) {
+ return NULL;
+ }
+ return fp;
+}
+
+struct fileproc *
+fp_get_noref_locked_with_iocount(proc_t p, int fd)
+{
+ struct filedesc *fdp = p->p_fd;
+ struct fileproc *fp = NULL;
+
+ if (fd < 0 || fd >= fdp->fd_nfiles ||
+ (fp = fdp->fd_ofiles[fd]) == NULL ||
+ os_ref_get_count(&fp->fp_iocount) <= 1 ||
+ ((fdp->fd_ofileflags[fd] & UF_RESERVED) &&
+ !(fdp->fd_ofileflags[fd] & UF_CLOSING))) {
+ panic("%s: caller without an ioccount on fileproc (%d/:%p)",
+ __func__, fd, fp);
+ }
+
+ return fp;
+}
+
+int
+fp_get_ftype(proc_t p, int fd, file_type_t ftype, int err, struct fileproc **fpp)
+{
+ struct filedesc *fdp = p->p_fd;
+ struct fileproc *fp;
+
+ proc_fdlock_spin(p);
+ if (fd < 0 || fd >= fdp->fd_nfiles ||
+ (fp = fdp->fd_ofiles[fd]) == NULL ||
+ (fdp->fd_ofileflags[fd] & UF_RESERVED)) {
+ proc_fdunlock(p);
+ return EBADF;
+ }
+
+ if (fp->f_type != ftype) {
+ proc_fdunlock(p);
+ return err;
+ }
+
+ os_ref_retain_locked(&fp->fp_iocount);
+ proc_fdunlock(p);
+
+ *fpp = fp;
+ return 0;
+}
+
+
+/*
+ * fp_getfvp
+ *
+ * Description: Get fileproc and vnode pointer for a given fd from the per
+ * process open file table of the specified process, and if
+ * successful, increment the fp_iocount
+ *
+ * Parameters: p Process in which fd lives
+ * fd fd to get information for
+ * resultfp Pointer to result fileproc
+ * pointer area, or 0 if none
+ * resultvp Pointer to result vnode pointer
+ * area, or 0 if none
+ *
+ * Returns: 0 Success
+ * EBADF Bad file descriptor
+ * ENOTSUP fd does not refer to a vnode
+ *
+ * Implicit returns:
+ * *resultfp (modified) Fileproc pointer
+ * *resultvp (modified) vnode pointer
+ *
+ * Notes: The resultfp and resultvp fields are optional, and may be
+ * independently specified as NULL to skip returning information
+ *
+ * Locks: Internally takes and releases proc_fdlock
+ */
+int
+fp_getfvp(proc_t p, int fd, struct fileproc **resultfp, struct vnode **resultvp)
+{
+ struct fileproc *fp;
+ int error;
+
+ error = fp_get_ftype(p, fd, DTYPE_VNODE, ENOTSUP, &fp);
+ if (error == 0) {
+ if (resultfp) {
+ *resultfp = fp;
+ }
+ if (resultvp) {
+ *resultvp = (struct vnode *)fp->f_data;
+ }
+ }
+
+ return error;
+}
+
+
+/*
+ * fp_get_pipe_id
+ *
+ * Description: Get pipe id for a given fd from the per process open file table
+ * of the specified process.
+ *
+ * Parameters: p Process in which fd lives
+ * fd fd to get information for
+ * result_pipe_id Pointer to result pipe id
+ *
+ * Returns: 0 Success
+ * EIVAL NULL pointer arguments passed
+ * fp_lookup:EBADF Bad file descriptor
+ * ENOTSUP fd does not refer to a pipe
+ *
+ * Implicit returns:
+ * *result_pipe_id (modified) pipe id
+ *
+ * Locks: Internally takes and releases proc_fdlock
+ */
+int
+fp_get_pipe_id(proc_t p, int fd, uint64_t *result_pipe_id)
+{
+ struct fileproc *fp = FILEPROC_NULL;
+ struct fileglob *fg = NULL;
+ int error = 0;
+
+ if (p == NULL || result_pipe_id == NULL) {
+ return EINVAL;
+ }
+
+ proc_fdlock(p);
+ if ((error = fp_lookup(p, fd, &fp, 1))) {
+ proc_fdunlock(p);
+ return error;
+ }
+ fg = fp->fp_glob;
+
+ if (FILEGLOB_DTYPE(fg) == DTYPE_PIPE) {
+ *result_pipe_id = pipe_id((struct pipe*)fg->fg_data);
+ } else {
+ error = ENOTSUP;
+ }
+
+ fp_drop(p, fd, fp, 1);
+ proc_fdunlock(p);
+ return error;
+}
+
+
+/*
+ * fp_lookup
+ *
+ * Description: Get fileproc pointer for a given fd from the per process
+ * open file table of the specified process and if successful,
+ * increment the fp_iocount
+ *
+ * Parameters: p Process in which fd lives
+ * fd fd to get information for
+ * resultfp Pointer to result fileproc
+ * pointer area, or 0 if none
+ * locked !0 if the caller holds the
+ * proc_fdlock, 0 otherwise
+ *
+ * Returns: 0 Success
+ * EBADF Bad file descriptor
+ *
+ * Implicit returns:
+ * *resultfp (modified) Fileproc pointer
+ *
+ * Locks: If the argument 'locked' is non-zero, then the caller is
+ * expected to have taken and held the proc_fdlock; if it is
+ * zero, than this routine internally takes and drops this lock.
+ */
+int
+fp_lookup(proc_t p, int fd, struct fileproc **resultfp, int locked)
+{
+ struct filedesc *fdp = p->p_fd;
+ struct fileproc *fp;
+
+ if (!locked) {
+ proc_fdlock_spin(p);
+ }
+ if (fd < 0 || fdp == NULL || fd >= fdp->fd_nfiles ||
+ (fp = fdp->fd_ofiles[fd]) == NULL ||
+ (fdp->fd_ofileflags[fd] & UF_RESERVED)) {
+ if (!locked) {
+ proc_fdunlock(p);
+ }
+ return EBADF;
+ }
+ os_ref_retain_locked(&fp->fp_iocount);
+
+ if (resultfp) {
+ *resultfp = fp;
+ }
+ if (!locked) {
+ proc_fdunlock(p);
+ }
+
+ return 0;
+}
+
+
+/*
+ * fp_tryswap
+ *
+ * Description: Swap the fileproc pointer for a given fd with a new
+ * fileproc pointer in the per-process open file table of
+ * the specified process. The fdlock must be held at entry.
+ * Iff the swap is successful, the old fileproc pointer is freed.
+ *
+ * Parameters: p Process containing the fd
+ * fd The fd of interest
+ * nfp Pointer to the newfp
+ *
+ * Returns: 0 Success
+ * EBADF Bad file descriptor
+ * EINTR Interrupted
+ * EKEEPLOOKING Other references were active, try again.
+ */
+int
+fp_tryswap(proc_t p, int fd, struct fileproc *nfp)
+{
+ struct fileproc *fp;
+ int error;
+
+ proc_fdlock_assert(p, LCK_MTX_ASSERT_OWNED);
+
+ if (0 != (error = fp_lookup(p, fd, &fp, 1))) {
+ return error;
+ }
+ /*
+ * At this point, our caller (change_guardedfd_np) has
+ * one fp_iocount reference, and we just took another
+ * one to begin the replacement.
+ * fp and nfp have a +1 reference from allocation.
+ * Thus if no-one else is looking, fp_iocount should be 3.
+ */
+ if (os_ref_get_count(&fp->fp_iocount) < 3 ||
+ 1 != os_ref_get_count(&nfp->fp_iocount)) {
+ panic("%s: fp_iocount", __func__);
+ } else if (3 == os_ref_get_count(&fp->fp_iocount)) {
+ /* Copy the contents of *fp, preserving the "type" of *nfp */
+
+ nfp->fp_flags = (nfp->fp_flags & FP_TYPEMASK) |
+ (fp->fp_flags & ~FP_TYPEMASK);
+ os_ref_retain_locked(&nfp->fp_iocount);
+ os_ref_retain_locked(&nfp->fp_iocount);
+ nfp->fp_glob = fp->fp_glob;
+ nfp->fp_wset = fp->fp_wset;
+
+ p->p_fd->fd_ofiles[fd] = nfp;
+ fp_drop(p, fd, nfp, 1);
+
+ os_ref_release_live(&fp->fp_iocount);
+ os_ref_release_live(&fp->fp_iocount);
+ fileproc_free(fp);
+ } else {
+ /*
+ * Wait for all other active references to evaporate.
+ */
+ p->p_fpdrainwait = 1;
+ error = msleep(&p->p_fpdrainwait, &p->p_fdmlock,
+ PRIBIO | PCATCH, "tryswap fpdrain", NULL);
+ if (0 == error) {
+ /*
+ * Return an "internal" errno to trigger a full
+ * reevaluation of the change-guard attempt.
+ */
+ error = EKEEPLOOKING;
+ }
+ (void) fp_drop(p, fd, fp, 1);
+ }
+ return error;
+}
+
+
+/*
+ * fp_drop
+ *
+ * Description: Drop the I/O reference previously taken by calling fp_lookup
+ * et. al.
+ *
+ * Parameters: p Process in which the fd lives
+ * fd fd associated with the fileproc
+ * fp fileproc on which to set the
+ * flag and drop the reference
+ * locked flag to internally take and
+ * drop proc_fdlock if it is not
+ * already held by the caller
+ *
+ * Returns: 0 Success
+ * EBADF Bad file descriptor
+ *
+ * Locks: This function internally takes and drops the proc_fdlock for
+ * the supplied process if 'locked' is non-zero, and assumes that
+ * the caller already holds this lock if 'locked' is non-zero.
+ *
+ * Notes: The fileproc must correspond to the fd in the supplied proc
+ */
+int
+fp_drop(proc_t p, int fd, struct fileproc *fp, int locked)
+{
+ struct filedesc *fdp = p->p_fd;
+ int needwakeup = 0;
+
+ if (!locked) {
+ proc_fdlock_spin(p);
+ }
+ if ((fp == FILEPROC_NULL) && (fd < 0 || fd >= fdp->fd_nfiles ||
+ (fp = fdp->fd_ofiles[fd]) == NULL ||
+ ((fdp->fd_ofileflags[fd] & UF_RESERVED) &&
+ !(fdp->fd_ofileflags[fd] & UF_CLOSING)))) {
+ if (!locked) {
+ proc_fdunlock(p);
+ }
+ return EBADF;
+ }
+
+ if (1 == os_ref_release_locked(&fp->fp_iocount)) {
+ if (fp->fp_flags & FP_SELCONFLICT) {
+ fp->fp_flags &= ~FP_SELCONFLICT;
+ }
+
+ if (p->p_fpdrainwait) {
+ p->p_fpdrainwait = 0;
+ needwakeup = 1;
+ }
+ }
+ if (!locked) {
+ proc_fdunlock(p);
+ }
+ if (needwakeup) {
+ wakeup(&p->p_fpdrainwait);
+ }
+
+ return 0;
+}
+
+
+/*
+ * file_vnode
+ *
+ * Description: Given an fd, look it up in the current process's per process
+ * open file table, and return its internal vnode pointer.
+ *
+ * Parameters: fd fd to obtain vnode from
+ * vpp pointer to vnode return area
+ *
+ * Returns: 0 Success
+ * EINVAL The fd does not refer to a
+ * vnode fileproc entry
+ * fp_lookup:EBADF Bad file descriptor
+ *
+ * Implicit returns:
+ * *vpp (modified) Returned vnode pointer
+ *
+ * Locks: This function internally takes and drops the proc_fdlock for
+ * the current process
+ *
+ * Notes: If successful, this function increments the fp_iocount on the
+ * fd's corresponding fileproc.
+ *
+ * The fileproc referenced is not returned; because of this, care
+ * must be taken to not drop the last reference (e.g. by closing
+ * the file). This is inherently unsafe, since the reference may
+ * not be recoverable from the vnode, if there is a subsequent
+ * close that destroys the associate fileproc. The caller should
+ * therefore retain their own reference on the fileproc so that
+ * the fp_iocount can be dropped subsequently. Failure to do this
+ * can result in the returned pointer immediately becoming invalid
+ * following the call.
+ *
+ * Use of this function is discouraged.
+ */
+int
+file_vnode(int fd, struct vnode **vpp)
+{
+ return file_vnode_withvid(fd, vpp, NULL);
+}
+
+/*
+ * file_vnode_withvid
+ *
+ * Description: Given an fd, look it up in the current process's per process
+ * open file table, and return its internal vnode pointer.
+ *
+ * Parameters: fd fd to obtain vnode from
+ * vpp pointer to vnode return area
+ * vidp pointer to vid of the returned vnode
+ *
+ * Returns: 0 Success
+ * EINVAL The fd does not refer to a
+ * vnode fileproc entry
+ * fp_lookup:EBADF Bad file descriptor
+ *
+ * Implicit returns:
+ * *vpp (modified) Returned vnode pointer
+ *
+ * Locks: This function internally takes and drops the proc_fdlock for
+ * the current process
+ *
+ * Notes: If successful, this function increments the fp_iocount on the
+ * fd's corresponding fileproc.
+ *
+ * The fileproc referenced is not returned; because of this, care
+ * must be taken to not drop the last reference (e.g. by closing
+ * the file). This is inherently unsafe, since the reference may
+ * not be recoverable from the vnode, if there is a subsequent
+ * close that destroys the associate fileproc. The caller should
+ * therefore retain their own reference on the fileproc so that
+ * the fp_iocount can be dropped subsequently. Failure to do this
+ * can result in the returned pointer immediately becoming invalid
+ * following the call.
+ *
+ * Use of this function is discouraged.
+ */
+int
+file_vnode_withvid(int fd, struct vnode **vpp, uint32_t *vidp)
+{
+ struct fileproc *fp;
+ int error;
+
+ error = fp_get_ftype(current_proc(), fd, DTYPE_VNODE, EINVAL, &fp);
+ if (error == 0) {
+ if (vpp) {
+ *vpp = fp->f_data;
+ }
+ if (vidp) {
+ *vidp = vnode_vid(fp->f_data);
+ }
+ }
+ return error;
+}
+
+/*
+ * file_socket
+ *
+ * Description: Given an fd, look it up in the current process's per process
+ * open file table, and return its internal socket pointer.
+ *
+ * Parameters: fd fd to obtain vnode from
+ * sp pointer to socket return area
+ *
+ * Returns: 0 Success
+ * ENOTSOCK Not a socket
+ * fp_lookup:EBADF Bad file descriptor
+ *
+ * Implicit returns:
+ * *sp (modified) Returned socket pointer
+ *
+ * Locks: This function internally takes and drops the proc_fdlock for
+ * the current process
+ *
+ * Notes: If successful, this function increments the fp_iocount on the
+ * fd's corresponding fileproc.
+ *
+ * The fileproc referenced is not returned; because of this, care
+ * must be taken to not drop the last reference (e.g. by closing
+ * the file). This is inherently unsafe, since the reference may
+ * not be recoverable from the socket, if there is a subsequent
+ * close that destroys the associate fileproc. The caller should
+ * therefore retain their own reference on the fileproc so that
+ * the fp_iocount can be dropped subsequently. Failure to do this
+ * can result in the returned pointer immediately becoming invalid
+ * following the call.
+ *
+ * Use of this function is discouraged.
+ */
+int
+file_socket(int fd, struct socket **sp)
+{
+ struct fileproc *fp;
+ int error;
+
+ error = fp_get_ftype(current_proc(), fd, DTYPE_SOCKET, ENOTSOCK, &fp);
+ if (error == 0) {
+ if (sp) {
+ *sp = (struct socket *)fp->f_data;
+ }
+ }
+ return error;
+}
+
+
+/*
+ * file_flags
+ *
+ * Description: Given an fd, look it up in the current process's per process
+ * open file table, and return its fileproc's flags field.
+ *
+ * Parameters: fd fd whose flags are to be
+ * retrieved
+ * flags pointer to flags data area
+ *
+ * Returns: 0 Success
+ * ENOTSOCK Not a socket
+ * fp_lookup:EBADF Bad file descriptor
+ *
+ * Implicit returns:
+ * *flags (modified) Returned flags field
+ *
+ * Locks: This function internally takes and drops the proc_fdlock for
+ * the current process
+ */
+int
+file_flags(int fd, int *flags)
+{
+ proc_t p = current_proc();
+ struct fileproc *fp;
+ int error = EBADF;
+
+ proc_fdlock_spin(p);
+ fp = fp_get_noref_locked(p, fd);
+ if (fp) {
+ *flags = (int)fp->f_flag;
+ error = 0;
+ }
+ proc_fdunlock(p);
+
+ return error;
+}
+
+
+/*
+ * file_drop
+ *
+ * Description: Drop an iocount reference on an fd, and wake up any waiters
+ * for draining (i.e. blocked in fileproc_drain() called during
+ * the last attempt to close a file).
+ *
+ * Parameters: fd fd on which an ioreference is
+ * to be dropped
+ *
+ * Returns: 0 Success
+ *
+ * Description: Given an fd, look it up in the current process's per process
+ * open file table, and drop it's fileproc's fp_iocount by one
+ *
+ * Notes: This is intended as a corresponding operation to the functions
+ * file_vnode() and file_socket() operations.
+ *
+ * If the caller can't possibly hold an I/O reference,
+ * this function will panic the kernel rather than allowing
+ * for memory corruption. Callers should always call this
+ * because they acquired an I/O reference on this file before.
+ *
+ * Use of this function is discouraged.
+ */
+int
+file_drop(int fd)
+{
+ struct fileproc *fp;
+ proc_t p = current_proc();
+ int needwakeup = 0;
+
+ proc_fdlock_spin(p);
+ fp = fp_get_noref_locked_with_iocount(p, fd);
+
+ if (1 == os_ref_release_locked(&fp->fp_iocount)) {
+ if (fp->fp_flags & FP_SELCONFLICT) {
+ fp->fp_flags &= ~FP_SELCONFLICT;
+ }
+
+ if (p->p_fpdrainwait) {
+ p->p_fpdrainwait = 0;
+ needwakeup = 1;
+ }
+ }
+ proc_fdunlock(p);
+
+ if (needwakeup) {
+ wakeup(&p->p_fpdrainwait);
+ }
+ return 0;
+}
+
+
+
+/*
+ * falloc_withalloc
+ *
+ * Create a new open file structure and allocate
+ * a file descriptor for the process that refers to it.
+ *
+ * Returns: 0 Success
+ *
+ * Description: Allocate an entry in the per process open file table and
+ * return the corresponding fileproc and fd.
+ *
+ * Parameters: p The process in whose open file
+ * table the fd is to be allocated
+ * resultfp Pointer to fileproc pointer
+ * return area
+ * resultfd Pointer to fd return area
+ * ctx VFS context
+ * fp_zalloc fileproc allocator to use
+ * crarg allocator args
+ *
+ * Returns: 0 Success
+ * ENFILE Too many open files in system
+ * fdalloc:EMFILE Too many open files in process
+ * fdalloc:ENOMEM M_OFILETABL zone exhausted
+ * ENOMEM fp_zone or fg_zone zone
+ * exhausted
+ *
+ * Implicit returns:
+ * *resultfd (modified) Returned fileproc pointer
+ * *resultfd (modified) Returned fd
+ *
+ * Notes: This function takes separate process and context arguments
+ * solely to support kern_exec.c; otherwise, it would take
+ * neither, and use the vfs_context_current() routine internally.
+ */
+int
+falloc_withalloc(proc_t p, struct fileproc **resultfp, int *resultfd,
+ vfs_context_t ctx, fp_allocfn_t fp_zalloc, void *crarg)
+{
+ struct fileproc *fp;
+ struct fileglob *fg;
+ int error, nfd;
+
+ /* Make sure we don't go beyond the system-wide limit */
+ if (nfiles >= maxfiles) {
+ tablefull("file");
+ return ENFILE;
+ }
+
+ proc_fdlock(p);
+
+ /* fdalloc will make sure the process stays below per-process limit */
+ if ((error = fdalloc(p, 0, &nfd))) {
+ proc_fdunlock(p);
+ return error;
+ }
+
+#if CONFIG_MACF
+ error = mac_file_check_create(proc_ucred(p));
+ if (error) {
+ proc_fdunlock(p);
+ return error;
+ }
+#endif
+
+ /*
+ * Allocate a new file descriptor.
+ * If the process has file descriptor zero open, add to the list
+ * of open files at that point, otherwise put it at the front of
+ * the list of open files.
+ */
+ proc_fdunlock(p);
+
+ fp = (*fp_zalloc)(crarg);
+ if (fp == NULL) {
+ return ENOMEM;
+ }
+ fg = zalloc_flags(fg_zone, Z_WAITOK | Z_ZERO);
+ lck_mtx_init(&fg->fg_lock, file_lck_grp, file_lck_attr);
+
+ os_ref_retain_locked(&fp->fp_iocount);
+ os_ref_init_raw(&fg->fg_count, &f_refgrp);
+ fg->fg_ops = &uninitops;
+ fp->fp_glob = fg;
+#if CONFIG_MACF
+ mac_file_label_init(fg);
+#endif
+
+ kauth_cred_ref(ctx->vc_ucred);
+
+ fp->f_cred = ctx->vc_ucred;
+
+#if CONFIG_MACF
+ mac_file_label_associate(fp->f_cred, fg);
+#endif
+
+ os_atomic_inc(&nfiles, relaxed);
+
+ proc_fdlock(p);
+
+ p->p_fd->fd_ofiles[nfd] = fp;
- default:
- return (EINVAL);
+ proc_fdunlock(p);
+
+ if (resultfp) {
+ *resultfp = fp;
+ }
+ if (resultfd) {
+ *resultfd = nfd;
}
- /* NOTREACHED */
-}
-/*
- * Common code for dup, dup2, and fcntl(F_DUPFD).
- */
-int
-finishdup(fdp, old, new, retval)
- register struct filedesc *fdp;
- register int old, new;
- register_t *retval;
-{
- register struct file *fp;
-
- if ((fp = fdp->fd_ofiles[old]) == NULL ||
- (fdp->fd_ofileflags[old] & UF_RESERVED)) {
- _fdrelse(fdp, new);
- return (EBADF);
- }
- fdp->fd_ofiles[new] = fp;
- fdp->fd_ofileflags[new] = fdp->fd_ofileflags[old] &~ UF_EXCLOSE;
- (void)fref(fp);
- if (new > fdp->fd_lastfile)
- fdp->fd_lastfile = new;
- *retval = new;
- return (0);
+ return 0;
}
-/*
- * Close a file descriptor.
- */
-struct close_args {
- int fd;
-};
-/* ARGSUSED */
int
-close(p, uap, retval)
- struct proc *p;
- struct close_args *uap;
- register_t *retval;
+falloc(proc_t p, struct fileproc **resultfp, int *resultfd, vfs_context_t ctx)
{
- int fd = uap->fd;
- register struct filedesc *fdp = p->p_fd;
- register struct file *fp;
-
- if ((u_int)fd >= fdp->fd_nfiles ||
- (fp = fdp->fd_ofiles[fd]) == NULL ||
- (fdp->fd_ofileflags[fd] & UF_RESERVED))
- return (EBADF);
- _fdrelse(fdp, fd);
- return (closef(fp, p));
+ return falloc_withalloc(p, resultfp, resultfd, ctx,
+ fileproc_alloc_init, NULL);
}
/*
- * Return status information about a file descriptor.
+ * fdexec
+ *
+ * Description: Perform close-on-exec processing for all files in a process
+ * that are either marked as close-on-exec, or which were in the
+ * process of being opened at the time of the execve
+ *
+ * Also handles the case (via posix_spawn()) where -all-
+ * files except those marked with "inherit" as treated as
+ * close-on-exec.
+ *
+ * Parameters: p Pointer to process calling
+ * execve
+ *
+ * Returns: void
+ *
+ * Locks: This function internally takes and drops proc_fdlock()
+ * But assumes tables don't grow/change while unlocked.
+ *
*/
-struct fstat_args {
- int fd;
- struct stat *sb;
-};
-/* ARGSUSED */
-int
-fstat(p, uap, retval)
- struct proc *p;
- register struct fstat_args *uap;
- register_t *retval;
+void
+fdexec(proc_t p, short flags, int self_exec)
{
- int fd = uap->fd;
- register struct filedesc *fdp = p->p_fd;
- register struct file *fp;
- struct stat ub;
- int error;
+ struct filedesc *fdp = p->p_fd;
+ int i;
+ boolean_t cloexec_default = (flags & POSIX_SPAWN_CLOEXEC_DEFAULT) != 0;
+ thread_t self = current_thread();
+ struct uthread *ut = get_bsdthread_info(self);
+ struct kqworkq *dealloc_kqwq = NULL;
- if ((u_int)fd >= fdp->fd_nfiles ||
- (fp = fdp->fd_ofiles[fd]) == NULL ||
- (fdp->fd_ofileflags[fd] & UF_RESERVED))
- return (EBADF);
- switch (fp->f_type) {
+ /*
+ * If the current thread is bound as a workq/workloop
+ * servicing thread, we need to unbind it first.
+ */
+ if (ut->uu_kqr_bound && self_exec) {
+ kqueue_threadreq_unbind(p, ut->uu_kqr_bound);
+ }
- case DTYPE_VNODE:
- error = vn_stat((struct vnode *)fp->f_data, &ub, p);
- break;
+ proc_fdlock(p);
- case DTYPE_SOCKET:
- error = soo_stat((struct socket *)fp->f_data, &ub);
- break;
+ /*
+ * Deallocate the knotes for this process
+ * and mark the tables non-existent so
+ * subsequent kqueue closes go faster.
+ */
+ knotes_dealloc(p);
+ assert(fdp->fd_knlistsize == 0);
+ assert(fdp->fd_knhashmask == 0);
+
+ for (i = fdp->fd_lastfile; i >= 0; i--) {
+ struct fileproc *fp = fdp->fd_ofiles[i];
+ char *flagp = &fdp->fd_ofileflags[i];
+
+ if (fp && cloexec_default) {
+ /*
+ * Reverse the usual semantics of file descriptor
+ * inheritance - all of them should be closed
+ * except files marked explicitly as "inherit" and
+ * not marked close-on-exec.
+ */
+ if ((*flagp & (UF_EXCLOSE | UF_INHERIT)) != UF_INHERIT) {
+ *flagp |= UF_EXCLOSE;
+ }
+ *flagp &= ~UF_INHERIT;
+ }
- case DTYPE_PSXSHM:
- error = pshm_stat((void *)fp->f_data, &ub);
- break;
- default:
- panic("fstat");
- /*NOTREACHED*/
+ if (
+ ((*flagp & (UF_RESERVED | UF_EXCLOSE)) == UF_EXCLOSE)
+#if CONFIG_MACF
+ || (fp && mac_file_check_inherit(proc_ucred(p), fp->fp_glob))
+#endif
+ ) {
+ fp_close_and_unlock(p, i, fp, 0);
+ proc_fdlock(p);
+ }
}
- if (error == 0)
- error = copyout((caddr_t)&ub, (caddr_t)uap->sb,
- sizeof (ub));
- return (error);
-}
-
-#if COMPAT_43
-/*
- * Return status information about a file descriptor.
- */
-struct ofstat_args {
- int fd;
- struct ostat *sb;
-};
-/* ARGSUSED */
-ofstat(p, uap, retval)
- struct proc *p;
- register struct ofstat_args *uap;
- register_t *retval;
-{
- int fd = uap->fd;
- register struct filedesc *fdp = p->p_fd;
- register struct file *fp;
- struct stat ub;
- struct ostat oub;
- int error;
-
- if ((u_int)fd >= fdp->fd_nfiles ||
- (fp = fdp->fd_ofiles[fd]) == NULL ||
- (fdp->fd_ofileflags[fd] & UF_RESERVED))
- return (EBADF);
- switch (fp->f_type) {
- case DTYPE_VNODE:
- error = vn_stat((struct vnode *)fp->f_data, &ub, p);
- break;
+ /* release the per-process workq kq */
+ if (fdp->fd_wqkqueue) {
+ dealloc_kqwq = fdp->fd_wqkqueue;
+ fdp->fd_wqkqueue = NULL;
+ }
- case DTYPE_SOCKET:
- error = soo_stat((struct socket *)fp->f_data, &ub);
- break;
+ proc_fdunlock(p);
- default:
- panic("ofstat");
- /*NOTREACHED*/
+ /* Anything to free? */
+ if (dealloc_kqwq) {
+ kqworkq_dealloc(dealloc_kqwq);
}
- cvtstat(&ub, &oub);
- if (error == 0)
- error = copyout((caddr_t)&oub, (caddr_t)uap->sb,
- sizeof (oub));
- return (error);
}
-#endif /* COMPAT_43 */
+
/*
- * Return pathconf information about a file descriptor.
+ * fdcopy
+ *
+ * Description: Copy a filedesc structure. This is normally used as part of
+ * forkproc() when forking a new process, to copy the per process
+ * open file table over to the new process.
+ *
+ * Parameters: p Process whose open file table
+ * is to be copied (parent)
+ * uth_cdir Per thread current working
+ * cirectory, or NULL
+ *
+ * Returns: NULL Copy failed
+ * !NULL Pointer to new struct filedesc
+ *
+ * Locks: This function internally takes and drops proc_fdlock()
+ *
+ * Notes: Files are copied directly, ignoring the new resource limits
+ * for the process that's being copied into. Since the descriptor
+ * references are just additional references, this does not count
+ * against the number of open files on the system.
+ *
+ * The struct filedesc includes the current working directory,
+ * and the current root directory, if the process is chroot'ed.
+ *
+ * If the exec was called by a thread using a per thread current
+ * working directory, we inherit the working directory from the
+ * thread making the call, rather than from the process.
+ *
+ * In the case of a failure to obtain a reference, for most cases,
+ * the file entry will be silently dropped. There's an exception
+ * for the case of a chroot dir, since a failure to to obtain a
+ * reference there would constitute an "escape" from the chroot
+ * environment, which must not be allowed. In that case, we will
+ * deny the execve() operation, rather than allowing the escape.
*/
-struct fpathconf_args {
- int fd;
- int name;
-};
-/* ARGSUSED */
-fpathconf(p, uap, retval)
- struct proc *p;
- register struct fpathconf_args *uap;
- register_t *retval;
+struct filedesc *
+fdcopy(proc_t p, vnode_t uth_cdir)
{
- int fd = uap->fd;
- struct filedesc *fdp = p->p_fd;
- struct file *fp;
- struct vnode *vp;
+ struct filedesc *newfdp, *fdp = p->p_fd;
+ int i;
+ struct fileproc *ofp, *fp;
+ vnode_t v_dir;
- if ((u_int)fd >= fdp->fd_nfiles ||
- (fp = fdp->fd_ofiles[fd]) == NULL ||
- (fdp->fd_ofileflags[fd] & UF_RESERVED))
- return (EBADF);
- switch (fp->f_type) {
+ newfdp = zalloc(fdp_zone);
- case DTYPE_SOCKET:
- if (uap->name != _PC_PIPE_BUF)
- return (EINVAL);
- *retval = PIPE_BUF;
- return (0);
+ proc_fdlock(p);
- case DTYPE_VNODE:
- vp = (struct vnode *)fp->f_data;
- return (VOP_PATHCONF(vp, uap->name, retval));
+ /*
+ * the FD_CHROOT flag will be inherited via this copy
+ */
+ (void) memcpy(newfdp, fdp, sizeof(*newfdp));
- default:
- panic("fpathconf");
+ /*
+ * If we are running with per-thread current working directories,
+ * inherit the new current working directory from the current thread
+ * instead, before we take our references.
+ */
+ if (uth_cdir != NULLVP) {
+ newfdp->fd_cdir = uth_cdir;
}
- /*NOTREACHED*/
-}
-
-/*
- * Allocate a file descriptor for the process.
- */
-int fdexpand;
-
-int
-fdalloc(p, want, result)
- struct proc *p;
- int want;
- int *result;
-{
- register struct filedesc *fdp = p->p_fd;
- register int i;
- int lim, last, nfiles, oldnfiles;
- struct file **newofiles, **ofiles;
- char *newofileflags, *ofileflags;
/*
- * Search for a free descriptor starting at the higher
- * of want or fd_freefile. If that fails, consider
- * expanding the ofile array.
+ * For both fd_cdir and fd_rdir make sure we get
+ * a valid reference... if we can't, than set
+ * set the pointer(s) to NULL in the child... this
+ * will keep us from using a non-referenced vp
+ * and allows us to do the vnode_rele only on
+ * a properly referenced vp
*/
- lim = min((int)p->p_rlimit[RLIMIT_NOFILE].rlim_cur, maxfiles);
- for (;;) {
- last = min(fdp->fd_nfiles, lim);
- if ((i = want) < fdp->fd_freefile)
- i = fdp->fd_freefile;
- ofiles = &fdp->fd_ofiles[i];
- ofileflags = &fdp->fd_ofileflags[i];
- for (; i < last; i++) {
- if (*ofiles == NULL && !(*ofileflags & UF_RESERVED)) {
- *ofileflags = UF_RESERVED;
- if (i > fdp->fd_lastfile)
- fdp->fd_lastfile = i;
- if (want <= fdp->fd_freefile)
- fdp->fd_freefile = i;
- *result = i;
- return (0);
+ if ((v_dir = newfdp->fd_cdir)) {
+ if (vnode_getwithref(v_dir) == 0) {
+ if ((vnode_ref(v_dir))) {
+ newfdp->fd_cdir = NULL;
}
- ofiles++; ofileflags++;
+ vnode_put(v_dir);
+ } else {
+ newfdp->fd_cdir = NULL;
}
+ }
+ if (newfdp->fd_cdir == NULL && fdp->fd_cdir) {
+ /*
+ * we couldn't get a new reference on
+ * the current working directory being
+ * inherited... we might as well drop
+ * our reference from the parent also
+ * since the vnode has gone DEAD making
+ * it useless... by dropping it we'll
+ * be that much closer to recycling it
+ */
+ vnode_rele(fdp->fd_cdir);
+ fdp->fd_cdir = NULL;
+ }
+ if ((v_dir = newfdp->fd_rdir)) {
+ if (vnode_getwithref(v_dir) == 0) {
+ if ((vnode_ref(v_dir))) {
+ newfdp->fd_rdir = NULL;
+ }
+ vnode_put(v_dir);
+ } else {
+ newfdp->fd_rdir = NULL;
+ }
+ }
+ /* Coming from a chroot environment and unable to get a reference... */
+ if (newfdp->fd_rdir == NULL && fdp->fd_rdir) {
+ proc_fdunlock(p);
/*
- * No space in current array. Expand?
+ * We couldn't get a new reference on
+ * the chroot directory being
+ * inherited... this is fatal, since
+ * otherwise it would constitute an
+ * escape from a chroot environment by
+ * the new process.
*/
- if (fdp->fd_nfiles >= lim)
- return (EMFILE);
- if (fdp->fd_nfiles < NDEXTENT)
- nfiles = NDEXTENT;
- else
- nfiles = 2 * fdp->fd_nfiles;
- /* Enforce lim */
- if (nfiles > lim)
- nfiles = lim;
- MALLOC_ZONE(newofiles, struct file **,
- nfiles * OFILESIZE, M_OFILETABL, M_WAITOK);
- if (fdp->fd_nfiles >= nfiles) {
- FREE_ZONE(newofiles, nfiles * OFILESIZE, M_OFILETABL);
- continue;
+ if (newfdp->fd_cdir) {
+ vnode_rele(newfdp->fd_cdir);
}
- newofileflags = (char *) &newofiles[nfiles];
+ zfree(fdp_zone, newfdp);
+ return NULL;
+ }
+
+ /*
+ * If the number of open files fits in the internal arrays
+ * of the open file structure, use them, otherwise allocate
+ * additional memory for the number of descriptors currently
+ * in use.
+ */
+ if (newfdp->fd_lastfile < NDFILE) {
+ i = NDFILE;
+ } else {
/*
- * Copy the existing ofile and ofileflags arrays
- * and zero the new portion of each array.
+ * Compute the smallest multiple of NDEXTENT needed
+ * for the file descriptors currently in use,
+ * allowing the table to shrink.
*/
- oldnfiles = fdp->fd_nfiles;
- (void) memcpy(newofiles, fdp->fd_ofiles,
- oldnfiles * sizeof *fdp->fd_ofiles);
- (void) memset(&newofiles[oldnfiles], 0,
- (nfiles - oldnfiles) * sizeof *fdp->fd_ofiles);
+ i = newfdp->fd_nfiles;
+ while (i > 1 + 2 * NDEXTENT && i > 1 + newfdp->fd_lastfile * 2) {
+ i /= 2;
+ }
+ }
+ proc_fdunlock(p);
- (void) memcpy(newofileflags, fdp->fd_ofileflags,
- oldnfiles * sizeof *fdp->fd_ofileflags);
- (void) memset(&newofileflags[oldnfiles], 0,
- (nfiles - oldnfiles) *
- sizeof *fdp->fd_ofileflags);
- ofiles = fdp->fd_ofiles;
- fdp->fd_ofiles = newofiles;
- fdp->fd_ofileflags = newofileflags;
- fdp->fd_nfiles = nfiles;
- FREE_ZONE(ofiles, oldnfiles * OFILESIZE, M_OFILETABL);
- fdexpand++;
+ MALLOC(newfdp->fd_ofiles, struct fileproc **,
+ i * OFILESIZE, M_OFILETABL, M_WAITOK);
+ if (newfdp->fd_ofiles == NULL) {
+ if (newfdp->fd_cdir) {
+ vnode_rele(newfdp->fd_cdir);
+ }
+ if (newfdp->fd_rdir) {
+ vnode_rele(newfdp->fd_rdir);
+ }
+
+ zfree(fdp_zone, newfdp);
+ return NULL;
+ }
+ (void) memset(newfdp->fd_ofiles, 0, i * OFILESIZE);
+ proc_fdlock(p);
+
+ newfdp->fd_ofileflags = (char *) &newfdp->fd_ofiles[i];
+ newfdp->fd_nfiles = i;
+
+ if (fdp->fd_nfiles > 0) {
+ struct fileproc **fpp;
+ char *flags;
+
+ (void) memcpy(newfdp->fd_ofiles, fdp->fd_ofiles,
+ (newfdp->fd_lastfile + 1) * sizeof(*fdp->fd_ofiles));
+ (void) memcpy(newfdp->fd_ofileflags, fdp->fd_ofileflags,
+ (newfdp->fd_lastfile + 1) * sizeof(*fdp->fd_ofileflags));
+
+ fpp = &newfdp->fd_ofiles[newfdp->fd_lastfile];
+ flags = &newfdp->fd_ofileflags[newfdp->fd_lastfile];
+ for (i = newfdp->fd_lastfile; i >= 0; i--, fpp--, flags--) {
+ if ((ofp = *fpp) != NULL &&
+ 0 == (ofp->fp_glob->fg_lflags & FG_CONFINED) &&
+ 0 == (*flags & (UF_FORKCLOSE | UF_RESERVED))) {
+#if DEBUG
+ if (FILEPROC_TYPE(ofp) != FTYPE_SIMPLE) {
+ panic("complex fileproc");
+ }
+#endif
+ fp = fileproc_alloc_init(NULL);
+ if (fp == NULL) {
+ /*
+ * XXX no room to copy, unable to
+ * XXX safely unwind state at present
+ */
+ *fpp = NULL;
+ } else {
+ fp->fp_flags |=
+ (ofp->fp_flags & ~FP_TYPEMASK);
+ fp->fp_glob = ofp->fp_glob;
+ fg_ref(p, fp->fp_glob);
+ *fpp = fp;
+ }
+ } else {
+ *fpp = NULL;
+ *flags = 0;
+ }
+ if (*fpp == NULL) {
+ if (i == newfdp->fd_lastfile && i > 0) {
+ newfdp->fd_lastfile--;
+ }
+ if (i < newfdp->fd_freefile) {
+ newfdp->fd_freefile = i;
+ }
+ }
+ }
}
+
+ proc_fdunlock(p);
+
+ /*
+ * Initialize knote and kqueue tracking structs
+ */
+ newfdp->fd_knlist = NULL;
+ newfdp->fd_knlistsize = 0;
+ newfdp->fd_knhash = NULL;
+ newfdp->fd_knhashmask = 0;
+ newfdp->fd_kqhash = NULL;
+ newfdp->fd_kqhashmask = 0;
+ newfdp->fd_wqkqueue = NULL;
+ lck_mtx_init(&newfdp->fd_kqhashlock, proc_kqhashlock_grp, proc_lck_attr);
+ lck_mtx_init(&newfdp->fd_knhashlock, proc_knhashlock_grp, proc_lck_attr);
+
+ return newfdp;
}
+
/*
- * Check to see whether n user file descriptors
- * are available to the process p.
+ * fdfree
+ *
+ * Description: Release a filedesc (per process open file table) structure;
+ * this is done on process exit(), or from forkproc_free() if
+ * the fork fails for some reason subsequent to a successful
+ * call to fdcopy()
+ *
+ * Parameters: p Pointer to process going away
+ *
+ * Returns: void
+ *
+ * Locks: This function internally takes and drops proc_fdlock()
*/
-int
-fdavail(p, n)
- struct proc *p;
- register int n;
-{
- register struct filedesc *fdp = p->p_fd;
- register struct file **fpp;
- register char *flags;
- register int i, lim;
-
- lim = min((int)p->p_rlimit[RLIMIT_NOFILE].rlim_cur, maxfiles);
- if ((i = lim - fdp->fd_nfiles) > 0 && (n -= i) <= 0)
- return (1);
- fpp = &fdp->fd_ofiles[fdp->fd_freefile];
- flags = &fdp->fd_ofileflags[fdp->fd_freefile];
- for (i = fdp->fd_nfiles - fdp->fd_freefile; --i >= 0; fpp++, flags++)
- if (*fpp == NULL && !(*flags & UF_RESERVED) && --n <= 0)
- return (1);
- return (0);
+void
+fdfree(proc_t p)
+{
+ struct filedesc *fdp;
+ struct fileproc *fp;
+ struct kqworkq *dealloc_kqwq = NULL;
+ int i;
+
+ proc_fdlock(p);
+
+ if (p == kernproc || NULL == (fdp = p->p_fd)) {
+ proc_fdunlock(p);
+ return;
+ }
+
+ extern struct filedesc filedesc0;
+
+ if (&filedesc0 == fdp) {
+ panic("filedesc0");
+ }
+
+ /*
+ * deallocate all the knotes up front and claim empty
+ * tables to make any subsequent kqueue closes faster.
+ */
+ knotes_dealloc(p);
+ assert(fdp->fd_knlistsize == 0);
+ assert(fdp->fd_knhashmask == 0);
+
+ /*
+ * dealloc all workloops that have outstanding retains
+ * when created with scheduling parameters.
+ */
+ kqworkloops_dealloc(p);
+
+ /* close file descriptors */
+ if (fdp->fd_nfiles > 0 && fdp->fd_ofiles) {
+ for (i = fdp->fd_lastfile; i >= 0; i--) {
+ if ((fp = fdp->fd_ofiles[i]) != NULL) {
+ if (fdp->fd_ofileflags[i] & UF_RESERVED) {
+ panic("fdfree: found fp with UF_RESERVED");
+ }
+ fp_close_and_unlock(p, i, fp, 0);
+ proc_fdlock(p);
+ }
+ }
+ FREE(fdp->fd_ofiles, M_OFILETABL);
+ fdp->fd_ofiles = NULL;
+ fdp->fd_nfiles = 0;
+ }
+
+ if (fdp->fd_wqkqueue) {
+ dealloc_kqwq = fdp->fd_wqkqueue;
+ fdp->fd_wqkqueue = NULL;
+ }
+
+ proc_fdunlock(p);
+
+ if (dealloc_kqwq) {
+ kqworkq_dealloc(dealloc_kqwq);
+ }
+ if (fdp->fd_cdir) {
+ vnode_rele(fdp->fd_cdir);
+ }
+ if (fdp->fd_rdir) {
+ vnode_rele(fdp->fd_rdir);
+ }
+
+ proc_fdlock_spin(p);
+ p->p_fd = NULL;
+ proc_fdunlock(p);
+
+ if (fdp->fd_kqhash) {
+ for (uint32_t j = 0; j <= fdp->fd_kqhashmask; j++) {
+ assert(LIST_EMPTY(&fdp->fd_kqhash[j]));
+ }
+ hashdestroy(fdp->fd_kqhash, M_KQUEUE, fdp->fd_kqhashmask);
+ }
+
+ lck_mtx_destroy(&fdp->fd_kqhashlock, proc_kqhashlock_grp);
+ lck_mtx_destroy(&fdp->fd_knhashlock, proc_knhashlock_grp);
+
+ zfree(fdp_zone, fdp);
}
+/*
+ * fileproc_drain
+ *
+ * Description: Drain out pending I/O operations
+ *
+ * Parameters: p Process closing this file
+ * fp fileproc struct for the open
+ * instance on the file
+ *
+ * Returns: void
+ *
+ * Locks: Assumes the caller holds the proc_fdlock
+ *
+ * Notes: For character devices, this occurs on the last close of the
+ * device; for all other file descriptors, this occurs on each
+ * close to prevent fd's from being closed out from under
+ * operations currently in progress and blocked
+ *
+ * See Also: file_vnode(), file_socket(), file_drop(), and the cautions
+ * regarding their use and interaction with this function.
+ */
void
-fdrelse(p, fd)
- struct proc *p;
- int fd;
+fileproc_drain(proc_t p, struct fileproc * fp)
{
- _fdrelse(p->p_fd, fd);
+ struct vfs_context context;
+ thread_t thread;
+ bool is_current_proc;
+
+ is_current_proc = (p == current_proc());
+
+ if (!is_current_proc) {
+ proc_lock(p);
+ thread = proc_thread(p); /* XXX */
+ thread_reference(thread);
+ proc_unlock(p);
+ } else {
+ thread = current_thread();
+ }
+
+ context.vc_thread = thread;
+ context.vc_ucred = fp->fp_glob->fg_cred;
+
+ /* Set the vflag for drain */
+ fileproc_modify_vflags(fp, FPV_DRAIN, FALSE);
+
+ while (os_ref_get_count(&fp->fp_iocount) > 1) {
+ lck_mtx_convert_spin(&p->p_fdmlock);
+
+ fo_drain(fp, &context);
+ if ((fp->fp_flags & FP_INSELECT) == FP_INSELECT) {
+ if (waitq_wakeup64_all((struct waitq *)fp->fp_wset, NO_EVENT64,
+ THREAD_INTERRUPTED, WAITQ_ALL_PRIORITIES) == KERN_INVALID_ARGUMENT) {
+ panic("bad wait queue for waitq_wakeup64_all %p (fp:%p)", fp->fp_wset, fp);
+ }
+ }
+ if ((fp->fp_flags & FP_SELCONFLICT) == FP_SELCONFLICT) {
+ if (waitq_wakeup64_all(&select_conflict_queue, NO_EVENT64,
+ THREAD_INTERRUPTED, WAITQ_ALL_PRIORITIES) == KERN_INVALID_ARGUMENT) {
+ panic("bad select_conflict_queue");
+ }
+ }
+ p->p_fpdrainwait = 1;
+
+ msleep(&p->p_fpdrainwait, &p->p_fdmlock, PRIBIO, "fpdrain", NULL);
+ }
+#if DIAGNOSTIC
+ if ((fp->fp_flags & FP_INSELECT) != 0) {
+ panic("FP_INSELECT set on drained fp");
+ }
+#endif
+ if ((fp->fp_flags & FP_SELCONFLICT) == FP_SELCONFLICT) {
+ fp->fp_flags &= ~FP_SELCONFLICT;
+ }
+
+ if (!is_current_proc) {
+ thread_deallocate(thread);
+ }
}
-int
-fdgetf(p, fd, resultfp)
- register struct proc *p;
- register int fd;
- struct file **resultfp;
-{
- register struct filedesc *fdp = p->p_fd;
- struct file *fp;
- if ((u_int)fd >= fdp->fd_nfiles ||
- (fp = fdp->fd_ofiles[fd]) == NULL ||
- (fdp->fd_ofileflags[fd] & UF_RESERVED))
- return (EBADF);
+/*
+ * fp_free
+ *
+ * Description: Release the fd and free the fileproc associated with the fd
+ * in the per process open file table of the specified process;
+ * these values must correspond.
+ *
+ * Parameters: p Process containing fd
+ * fd fd to be released
+ * fp fileproc to be freed
+ */
+void
+fp_free(proc_t p, int fd, struct fileproc * fp)
+{
+ proc_fdlock_spin(p);
+ fdrelse(p, fd);
+ proc_fdunlock(p);
- if (resultfp)
- *resultfp = fp;
- return (0);
+ fg_free(fp->fp_glob);
+ os_ref_release_live(&fp->fp_iocount);
+ fileproc_free(fp);
}
+
/*
- * Create a new open file structure and allocate
- * a file decriptor for the process that refers to it.
+ * sys_flock
+ *
+ * Description: Apply an advisory lock on a file descriptor.
+ *
+ * Parameters: p Process making request
+ * uap->fd fd on which the lock is to be
+ * attempted
+ * uap->how (Un)Lock bits, including type
+ * retval Pointer to the call return area
+ *
+ * Returns: 0 Success
+ * fp_getfvp:EBADF Bad file descriptor
+ * fp_getfvp:ENOTSUP fd does not refer to a vnode
+ * vnode_getwithref:???
+ * VNOP_ADVLOCK:???
+ *
+ * Implicit returns:
+ * *retval (modified) Size of dtable
+ *
+ * Notes: Just attempt to get a record lock of the requested type on
+ * the entire file (l_whence = SEEK_SET, l_start = 0, l_len = 0).
*/
int
-falloc(p, resultfp, resultfd)
- register struct proc *p;
- struct file **resultfp;
- int *resultfd;
+sys_flock(proc_t p, struct flock_args *uap, __unused int32_t *retval)
{
- register struct file *fp, *fq;
- int error, i;
+ int fd = uap->fd;
+ int how = uap->how;
+ struct fileproc *fp;
+ struct vnode *vp;
+ struct flock lf;
+ vfs_context_t ctx = vfs_context_current();
+ int error = 0;
- if (error = fdalloc(p, 0, &i))
- return (error);
- if (nfiles >= maxfiles) {
- tablefull("file");
- return (ENFILE);
+ AUDIT_ARG(fd, uap->fd);
+ if ((error = fp_getfvp(p, fd, &fp, &vp))) {
+ return error;
+ }
+ if ((error = vnode_getwithref(vp))) {
+ goto out1;
+ }
+ AUDIT_ARG(vnpath, vp, ARG_VNODE1);
+
+ lf.l_whence = SEEK_SET;
+ lf.l_start = 0;
+ lf.l_len = 0;
+ if (how & LOCK_UN) {
+ lf.l_type = F_UNLCK;
+ error = VNOP_ADVLOCK(vp, (caddr_t)fp->fp_glob, F_UNLCK, &lf, F_FLOCK, ctx, NULL);
+ goto out;
}
- /*
- * Allocate a new file descriptor.
- * If the process has file descriptor zero open, add to the list
- * of open files at that point, otherwise put it at the front of
- * the list of open files.
- */
- nfiles++;
- MALLOC_ZONE(fp, struct file *, sizeof(struct file), M_FILE, M_WAITOK);
- bzero(fp, sizeof(struct file));
- if (fq = p->p_fd->fd_ofiles[0]) {
- LIST_INSERT_AFTER(fq, fp, f_list);
+ if (how & LOCK_EX) {
+ lf.l_type = F_WRLCK;
+ } else if (how & LOCK_SH) {
+ lf.l_type = F_RDLCK;
} else {
- LIST_INSERT_HEAD(&filehead, fp, f_list);
+ error = EBADF;
+ goto out;
}
- p->p_fd->fd_ofiles[i] = fp;
- fp->f_count = 1;
- fp->f_cred = p->p_ucred;
- crhold(fp->f_cred);
- if (resultfp)
- *resultfp = fp;
- if (resultfd)
- *resultfd = i;
- return (0);
+#if CONFIG_MACF
+ error = mac_file_check_lock(proc_ucred(p), fp->fp_glob, F_SETLK, &lf);
+ if (error) {
+ goto out;
+ }
+#endif
+ error = VNOP_ADVLOCK(vp, (caddr_t)fp->fp_glob, F_SETLK, &lf,
+ (how & LOCK_NB ? F_FLOCK : F_FLOCK | F_WAIT),
+ ctx, NULL);
+ if (!error) {
+ os_atomic_or(&fp->fp_glob->fg_flag, FWASLOCKED, relaxed);
+ }
+out:
+ (void)vnode_put(vp);
+out1:
+ fp_drop(p, fd, fp, 0);
+ return error;
}
/*
- * Free a file structure.
+ * sys_fileport_makeport
+ *
+ * Description: Obtain a Mach send right for a given file descriptor.
+ *
+ * Parameters: p Process calling fileport
+ * uap->fd The fd to reference
+ * uap->portnamep User address at which to place port name.
+ *
+ * Returns: 0 Success.
+ * EBADF Bad file descriptor.
+ * EINVAL File descriptor had type that cannot be sent, misc. other errors.
+ * EFAULT Address at which to store port name is not valid.
+ * EAGAIN Resource shortage.
+ *
+ * Implicit returns:
+ * On success, name of send right is stored at user-specified address.
*/
-void
-ffree(fp)
- register struct file *fp;
+int
+sys_fileport_makeport(proc_t p, struct fileport_makeport_args *uap,
+ __unused int *retval)
{
- register struct file *fq;
- struct ucred *cred;
+ int err;
+ int fd = uap->fd;
+ user_addr_t user_portaddr = uap->portnamep;
+ struct fileproc *fp = FILEPROC_NULL;
+ struct fileglob *fg = NULL;
+ ipc_port_t fileport;
+ mach_port_name_t name = MACH_PORT_NULL;
+
+ proc_fdlock(p);
+ err = fp_lookup(p, fd, &fp, 1);
+ if (err != 0) {
+ goto out_unlock;
+ }
- LIST_REMOVE(fp, f_list);
- cred = fp->f_cred;
- if (cred != NOCRED) {
- fp->f_cred = NOCRED;
- crfree(cred);
+ fg = fp->fp_glob;
+ if (!fg_sendable(fg)) {
+ err = EINVAL;
+ goto out_unlock;
}
-#if 1 || DIAGNOSTIC
- fp->f_count = 0;
-#endif
- nfiles--;
- FREE_ZONE(fp, sizeof *fp, M_FILE);
-}
-void
-fdexec(p)
- struct proc *p;
-{
- register struct filedesc *fdp = p->p_fd;
- register int i = fdp->fd_lastfile;
- register struct file **fpp = &fdp->fd_ofiles[i];
- register char *flags = &fdp->fd_ofileflags[i];
+ if (FP_ISGUARDED(fp, GUARD_FILEPORT)) {
+ err = fp_guard_exception(p, fd, fp, kGUARD_EXC_FILEPORT);
+ goto out_unlock;
+ }
- while (i >= 0) {
- if ((*flags & (UF_RESERVED|UF_EXCLOSE)) == UF_EXCLOSE) {
- register struct file *fp = *fpp;
+ /* Dropped when port is deallocated */
+ fg_ref(p, fg);
- *fpp = NULL; *flags = 0;
- if (i == fdp->fd_lastfile && i > 0)
- fdp->fd_lastfile--;
- closef(fp, p);
- }
- else
- *flags &= ~UF_MAPPED;
+ proc_fdunlock(p);
- i--; fpp--; flags--;
+ /* Allocate and initialize a port */
+ fileport = fileport_alloc(fg);
+ if (fileport == IPC_PORT_NULL) {
+ fg_drop_live(fg);
+ err = EAGAIN;
+ goto out;
}
-}
-
-/*
- * Copy a filedesc structure.
- */
-struct filedesc *
-fdcopy(p)
- struct proc *p;
-{
- register struct filedesc *newfdp, *fdp = p->p_fd;
- register int i;
- MALLOC_ZONE(newfdp, struct filedesc *,
- sizeof *newfdp, M_FILEDESC, M_WAITOK);
- (void) memcpy(newfdp, fdp, sizeof *newfdp);
- VREF(newfdp->fd_cdir);
- if (newfdp->fd_rdir)
- VREF(newfdp->fd_rdir);
- newfdp->fd_refcnt = 1;
+ /* Add an entry. Deallocates port on failure. */
+ name = ipc_port_copyout_send(fileport, get_task_ipcspace(p->task));
+ if (!MACH_PORT_VALID(name)) {
+ err = EINVAL;
+ goto out;
+ }
- /*
- * If the number of open files fits in the internal arrays
- * of the open file structure, use them, otherwise allocate
- * additional memory for the number of descriptors currently
- * in use.
- */
- if (newfdp->fd_lastfile < NDFILE)
- i = NDFILE;
- else {
- /*
- * Compute the smallest multiple of NDEXTENT needed
- * for the file descriptors currently in use,
- * allowing the table to shrink.
- */
- i = newfdp->fd_nfiles;
- while (i > 2 * NDEXTENT && i > newfdp->fd_lastfile * 2)
- i /= 2;
+ err = copyout(&name, user_portaddr, sizeof(mach_port_name_t));
+ if (err != 0) {
+ goto out;
}
- MALLOC_ZONE(newfdp->fd_ofiles, struct file **,
- i * OFILESIZE, M_OFILETABL, M_WAITOK);
- newfdp->fd_ofileflags = (char *) &newfdp->fd_ofiles[i];
- newfdp->fd_nfiles = i;
- if (fdp->fd_nfiles > 0) {
- register struct file **fpp;
- register char *flags;
- (void) memcpy(newfdp->fd_ofiles, fdp->fd_ofiles,
- i * sizeof *fdp->fd_ofiles);
- (void) memcpy(newfdp->fd_ofileflags, fdp->fd_ofileflags,
- i * sizeof *fdp->fd_ofileflags);
+ /* Tag the fileglob for debugging purposes */
+ lck_mtx_lock_spin(&fg->fg_lock);
+ fg->fg_lflags |= FG_PORTMADE;
+ lck_mtx_unlock(&fg->fg_lock);
- fpp = newfdp->fd_ofiles;
- flags = newfdp->fd_ofileflags;
- for (i = newfdp->fd_lastfile; i-- >= 0; fpp++, flags++)
- if (*fpp != NULL && !(*flags & UF_RESERVED)) {
- (void)fref(*fpp);
- } else {
- *fpp = NULL;
- *flags = 0;
- }
+ fp_drop(p, fd, fp, 0);
+
+ return 0;
+
+out_unlock:
+ proc_fdunlock(p);
+out:
+ if (MACH_PORT_VALID(name)) {
+ /* Don't care if another thread races us to deallocate the entry */
+ (void) mach_port_deallocate(get_task_ipcspace(p->task), name);
+ }
+
+ if (fp != FILEPROC_NULL) {
+ fp_drop(p, fd, fp, 0);
}
- else
- (void) memset(newfdp->fd_ofiles, 0, i * OFILESIZE);
- return (newfdp);
+ return err;
}
-/*
- * Release a filedesc structure.
- */
void
-fdfree(p)
- struct proc *p;
+fileport_releasefg(struct fileglob *fg)
{
- register struct filedesc *fdp;
- register struct file **fpp;
- register int i;
-
- if ((fdp = p->p_fd) == NULL)
- return;
- if (--fdp->fd_refcnt > 0)
- return;
- p->p_fd = NULL;
- if (fdp->fd_nfiles > 0) {
- fpp = fdp->fd_ofiles;
- for (i = fdp->fd_lastfile; i-- >= 0; fpp++)
- if (*fpp)
- (void) closef(*fpp, p);
- FREE_ZONE(fdp->fd_ofiles,
- fdp->fd_nfiles * OFILESIZE, M_OFILETABL);
- }
- vrele(fdp->fd_cdir);
- if (fdp->fd_rdir)
- vrele(fdp->fd_rdir);
- FREE_ZONE(fdp, sizeof *fdp, M_FILEDESC);
+ (void)fg_drop(PROC_NULL, fg);
}
/*
- * Internal form of close.
- * Decrement reference count on file structure.
- * Note: p may be NULL when closing a file
- * that was being passed in a message.
+ * fileport_makefd
+ *
+ * Description: Obtain the file descriptor for a given Mach send right.
+ *
+ * Returns: 0 Success
+ * EINVAL Invalid Mach port name, or port is not for a file.
+ * fdalloc:EMFILE
+ * fdalloc:ENOMEM Unable to allocate fileproc or extend file table.
+ *
+ * Implicit returns:
+ * *retval (modified) The new descriptor
*/
int
-closef(fp, p)
- register struct file *fp;
- register struct proc *p;
+fileport_makefd(proc_t p, ipc_port_t port, int uf_flags, int *retval)
{
- struct vnode *vp;
- struct flock lf;
- int error;
+ struct fileglob *fg;
+ struct fileproc *fp = FILEPROC_NULL;
+ int fd;
+ int err;
- if (fp == NULL)
- return (0);
- /*
- * POSIX record locking dictates that any close releases ALL
- * locks owned by this process. This is handled by setting
- * a flag in the unlock to free ONLY locks obeying POSIX
- * semantics, and not to free BSD-style file locks.
- * If the descriptor was in a message, POSIX-style locks
- * aren't passed with the descriptor.
- */
- if (p && (p->p_flag & P_ADVLOCK) && fp->f_type == DTYPE_VNODE) {
- lf.l_whence = SEEK_SET;
- lf.l_start = 0;
- lf.l_len = 0;
- lf.l_type = F_UNLCK;
- vp = (struct vnode *)fp->f_data;
- (void) VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_POSIX);
- }
- if (frele(fp) > 0)
- return (0);
- if ((fp->f_flag & FHASLOCK) && fp->f_type == DTYPE_VNODE) {
- lf.l_whence = SEEK_SET;
- lf.l_start = 0;
- lf.l_len = 0;
- lf.l_type = F_UNLCK;
- vp = (struct vnode *)fp->f_data;
- (void) VOP_ADVLOCK(vp, (caddr_t)fp, F_UNLCK, &lf, F_FLOCK);
+ fg = fileport_port_to_fileglob(port);
+ if (fg == NULL) {
+ err = EINVAL;
+ goto out;
}
- if (fp->f_ops)
- error = (*fp->f_ops->fo_close)(fp, p);
- else
- error = 0;
- ffree(fp);
- return (error);
-}
-/*
- * Apply an advisory lock on a file descriptor.
- *
- * Just attempt to get a record lock of the requested type on
- * the entire file (l_whence = SEEK_SET, l_start = 0, l_len = 0).
- */
-struct flock_args {
- int fd;
- int how;
-};
-/* ARGSUSED */
-int
-flock(p, uap, retval)
- struct proc *p;
- register struct flock_args *uap;
- register_t *retval;
-{
- int fd = uap->fd;
- int how = uap->how;
- register struct filedesc *fdp = p->p_fd;
- register struct file *fp;
- struct vnode *vp;
- struct flock lf;
+ fp = fileproc_alloc_init(NULL);
+ if (fp == FILEPROC_NULL) {
+ err = ENOMEM;
+ goto out;
+ }
- if ((u_int)fd >= fdp->fd_nfiles ||
- (fp = fdp->fd_ofiles[fd]) == NULL ||
- (fdp->fd_ofileflags[fd] & UF_RESERVED))
- return (EBADF);
- if (fp->f_type != DTYPE_VNODE)
- return (EOPNOTSUPP);
- vp = (struct vnode *)fp->f_data;
- lf.l_whence = SEEK_SET;
- lf.l_start = 0;
- lf.l_len = 0;
- if (how & LOCK_UN) {
- lf.l_type = F_UNLCK;
- fp->f_flag &= ~FHASLOCK;
- return (VOP_ADVLOCK(vp, (caddr_t)fp, F_UNLCK, &lf, F_FLOCK));
+ proc_fdlock(p);
+ err = fdalloc(p, 0, &fd);
+ if (err != 0) {
+ proc_fdunlock(p);
+ goto out;
}
- if (how & LOCK_EX)
- lf.l_type = F_WRLCK;
- else if (how & LOCK_SH)
- lf.l_type = F_RDLCK;
- else
- return (EBADF);
- fp->f_flag |= FHASLOCK;
- if (how & LOCK_NB)
- return (VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, F_FLOCK));
- return (VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, F_FLOCK|F_WAIT));
+ if (uf_flags) {
+ *fdflags(p, fd) |= uf_flags;
+ }
+
+ fp->fp_glob = fg;
+ fg_ref(p, fg);
+
+ procfdtbl_releasefd(p, fd, fp);
+ proc_fdunlock(p);
+
+ *retval = fd;
+ err = 0;
+out:
+ if ((fp != NULL) && (0 != err)) {
+ fileproc_free(fp);
+ }
+
+ return err;
}
/*
- * File Descriptor pseudo-device driver (/dev/fd/).
+ * sys_fileport_makefd
+ *
+ * Description: Obtain the file descriptor for a given Mach send right.
*
- * Opening minor device N dup()s the file (if any) connected to file
- * descriptor N belonging to the calling process. Note that this driver
- * consists of only the ``open()'' routine, because all subsequent
- * references to this file will be direct to the other driver.
+ * Parameters: p Process calling fileport
+ * uap->port Name of send right to file port.
+ *
+ * Returns: 0 Success
+ * EINVAL Invalid Mach port name, or port is not for a file.
+ * fdalloc:EMFILE
+ * fdalloc:ENOMEM Unable to allocate fileproc or extend file table.
+ *
+ * Implicit returns:
+ * *retval (modified) The new descriptor
*/
-/* ARGSUSED */
int
-fdopen(dev, mode, type, p)
- dev_t dev;
- int mode, type;
- struct proc *p;
+sys_fileport_makefd(proc_t p, struct fileport_makefd_args *uap, int32_t *retval)
{
+ ipc_port_t port = IPC_PORT_NULL;
+ mach_port_name_t send = uap->port;
+ kern_return_t res;
+ int err;
- /*
- * XXX Kludge: set curproc->p_dupfd to contain the value of the
- * the file descriptor being sought for duplication. The error
- * return ensures that the vnode for this device will be released
- * by vn_open. Open will detect this special error and take the
- * actions in dupfdopen below. Other callers of vn_open or VOP_OPEN
- * will simply report the error.
- */
- p->p_dupfd = minor(dev);
- return (ENODEV);
+ res = ipc_object_copyin(get_task_ipcspace(p->task),
+ send, MACH_MSG_TYPE_COPY_SEND, &port, 0, NULL, IPC_KMSG_FLAGS_ALLOW_IMMOVABLE_SEND);
+
+ if (res == KERN_SUCCESS) {
+ err = fileport_makefd(p, port, UF_EXCLOSE, retval);
+ } else {
+ err = EINVAL;
+ }
+
+ if (IPC_PORT_NULL != port) {
+ ipc_port_release_send(port);
+ }
+
+ return err;
}
+
/*
- * Duplicate the specified descriptor to a free descriptor.
+ * dupfdopen
+ *
+ * Description: Duplicate the specified descriptor to a free descriptor;
+ * this is the second half of fdopen(), above.
+ *
+ * Parameters: fdp filedesc pointer to fill in
+ * indx fd to dup to
+ * dfd fd to dup from
+ * mode mode to set on new fd
+ * error command code
+ *
+ * Returns: 0 Success
+ * EBADF Source fd is bad
+ * EACCES Requested mode not allowed
+ * !0 'error', if not ENODEV or
+ * ENXIO
+ *
+ * Notes: XXX This is not thread safe; see fdopen() above
*/
int
-dupfdopen(fdp, indx, dfd, mode, error)
- register struct filedesc *fdp;
- register int indx, dfd;
- int mode;
- int error;
+dupfdopen(struct filedesc *fdp, int indx, int dfd, int flags, int error)
{
- register struct file *wfp;
- struct file *fp;
+ struct fileproc *wfp;
+ struct fileproc *fp;
+#if CONFIG_MACF
+ int myerror;
+#endif
+ proc_t p = current_proc();
/*
* If the to-be-dup'd fd number is greater than the allowed number
* falloc could allocate an already closed to-be-dup'd descriptor
* as the new descriptor.
*/
- fp = fdp->fd_ofiles[indx];
- if ((u_int)dfd >= fdp->fd_nfiles ||
- (wfp = fdp->fd_ofiles[dfd]) == NULL || wfp == fp ||
- (fdp->fd_ofileflags[dfd] & UF_RESERVED))
- return (EBADF);
+ proc_fdlock(p);
+ fp = fdp->fd_ofiles[indx];
+ if (dfd < 0 || dfd >= fdp->fd_nfiles ||
+ (wfp = fdp->fd_ofiles[dfd]) == NULL || wfp == fp ||
+ (fdp->fd_ofileflags[dfd] & UF_RESERVED)) {
+ proc_fdunlock(p);
+ return EBADF;
+ }
+#if CONFIG_MACF
+ myerror = mac_file_check_dup(proc_ucred(p), wfp->fp_glob, dfd);
+ if (myerror) {
+ proc_fdunlock(p);
+ return myerror;
+ }
+#endif
/*
* There are two cases of interest here.
*
*/
switch (error) {
case ENODEV:
+ if (FP_ISGUARDED(wfp, GUARD_DUP)) {
+ proc_fdunlock(p);
+ return EPERM;
+ }
+
/*
* Check that the mode the file is being opened for is a
* subset of the mode of the existing descriptor.
*/
- if (((mode & (FREAD|FWRITE)) | wfp->f_flag) != wfp->f_flag)
- return (EACCES);
- (void)fref(wfp);
- if (indx > fdp->fd_lastfile)
- fdp->fd_lastfile = indx;;
- fdp->fd_ofiles[indx] = wfp;
- fdp->fd_ofileflags[indx] = fdp->fd_ofileflags[dfd];
- return (0);
-
- case ENXIO:
- /*
- * Steal away the file pointer from dfd, and stuff it into indx.
- */
- if (indx > fdp->fd_lastfile)
- fdp->fd_lastfile = indx;;
- fdp->fd_ofiles[indx] = fdp->fd_ofiles[dfd];
- fdp->fd_ofileflags[indx] = fdp->fd_ofileflags[dfd];
- _fdrelse(fdp, dfd);
- return (0);
+ if (((flags & (FREAD | FWRITE)) | wfp->f_flag) != wfp->f_flag) {
+ proc_fdunlock(p);
+ return EACCES;
+ }
+ if (indx > fdp->fd_lastfile) {
+ fdp->fd_lastfile = indx;
+ }
+
+ if (fp->fp_glob) {
+ fg_free(fp->fp_glob);
+ }
+ fg_ref(p, wfp->fp_glob);
+ fp->fp_glob = wfp->fp_glob;
+
+ fdp->fd_ofileflags[indx] = fdp->fd_ofileflags[dfd] |
+ (flags & O_CLOEXEC) ? UF_EXCLOSE : 0;
+
+ proc_fdunlock(p);
+ return 0;
default:
- return (error);
+ proc_fdunlock(p);
+ return error;
}
/* NOTREACHED */
}
-/* Reference manipulation routines for the file structure */
+
+/*
+ * fo_read
+ *
+ * Description: Generic fileops read indirected through the fileops pointer
+ * in the fileproc structure
+ *
+ * Parameters: fp fileproc structure pointer
+ * uio user I/O structure pointer
+ * flags FOF_ flags
+ * ctx VFS context for operation
+ *
+ * Returns: 0 Success
+ * !0 Errno from read
+ */
+int
+fo_read(struct fileproc *fp, struct uio *uio, int flags, vfs_context_t ctx)
+{
+ return (*fp->f_ops->fo_read)(fp, uio, flags, ctx);
+}
+
+int
+fo_no_read(struct fileproc *fp, struct uio *uio, int flags, vfs_context_t ctx)
+{
+#pragma unused(fp, uio, flags, ctx)
+ return ENXIO;
+}
+
+
+/*
+ * fo_write
+ *
+ * Description: Generic fileops write indirected through the fileops pointer
+ * in the fileproc structure
+ *
+ * Parameters: fp fileproc structure pointer
+ * uio user I/O structure pointer
+ * flags FOF_ flags
+ * ctx VFS context for operation
+ *
+ * Returns: 0 Success
+ * !0 Errno from write
+ */
+int
+fo_write(struct fileproc *fp, struct uio *uio, int flags, vfs_context_t ctx)
+{
+ return (*fp->f_ops->fo_write)(fp, uio, flags, ctx);
+}
+
+int
+fo_no_write(struct fileproc *fp, struct uio *uio, int flags, vfs_context_t ctx)
+{
+#pragma unused(fp, uio, flags, ctx)
+ return ENXIO;
+}
+
+
+/*
+ * fo_ioctl
+ *
+ * Description: Generic fileops ioctl indirected through the fileops pointer
+ * in the fileproc structure
+ *
+ * Parameters: fp fileproc structure pointer
+ * com ioctl command
+ * data pointer to internalized copy
+ * of user space ioctl command
+ * parameter data in kernel space
+ * ctx VFS context for operation
+ *
+ * Returns: 0 Success
+ * !0 Errno from ioctl
+ *
+ * Locks: The caller is assumed to have held the proc_fdlock; this
+ * function releases and reacquires this lock. If the caller
+ * accesses data protected by this lock prior to calling this
+ * function, it will need to revalidate/reacquire any cached
+ * protected data obtained prior to the call.
+ */
+int
+fo_ioctl(struct fileproc *fp, u_long com, caddr_t data, vfs_context_t ctx)
+{
+ int error;
+
+ proc_fdunlock(vfs_context_proc(ctx));
+ error = (*fp->f_ops->fo_ioctl)(fp, com, data, ctx);
+ proc_fdlock(vfs_context_proc(ctx));
+ return error;
+}
+
+int
+fo_no_ioctl(struct fileproc *fp, u_long com, caddr_t data, vfs_context_t ctx)
+{
+#pragma unused(fp, com, data, ctx)
+ return ENOTTY;
+}
+
+
+/*
+ * fo_select
+ *
+ * Description: Generic fileops select indirected through the fileops pointer
+ * in the fileproc structure
+ *
+ * Parameters: fp fileproc structure pointer
+ * which select which
+ * wql pointer to wait queue list
+ * ctx VFS context for operation
+ *
+ * Returns: 0 Success
+ * !0 Errno from select
+ */
+int
+fo_select(struct fileproc *fp, int which, void *wql, vfs_context_t ctx)
+{
+ return (*fp->f_ops->fo_select)(fp, which, wql, ctx);
+}
+
+int
+fo_no_select(struct fileproc *fp, int which, void *wql, vfs_context_t ctx)
+{
+#pragma unused(fp, which, wql, ctx)
+ return ENOTSUP;
+}
+
+
+/*
+ * fo_close
+ *
+ * Description: Generic fileops close indirected through the fileops pointer
+ * in the fileproc structure
+ *
+ * Parameters: fp fileproc structure pointer for
+ * file to close
+ * ctx VFS context for operation
+ *
+ * Returns: 0 Success
+ * !0 Errno from close
+ */
+int
+fo_close(struct fileglob *fg, vfs_context_t ctx)
+{
+ return (*fg->fg_ops->fo_close)(fg, ctx);
+}
+
+
+/*
+ * fo_drain
+ *
+ * Description: Generic fileops kqueue filter indirected through the fileops
+ * pointer in the fileproc structure
+ *
+ * Parameters: fp fileproc structure pointer
+ * ctx VFS context for operation
+ *
+ * Returns: 0 Success
+ * !0 errno from drain
+ */
+int
+fo_drain(struct fileproc *fp, vfs_context_t ctx)
+{
+ return (*fp->f_ops->fo_drain)(fp, ctx);
+}
int
-fref(struct file *fp)
+fo_no_drain(struct fileproc *fp, vfs_context_t ctx)
{
- if (++fp->f_count <= 0)
- panic("fref: f_count");
- return ((int)fp->f_count);
+#pragma unused(fp, ctx)
+ return ENOTSUP;
}
+
+/*
+ * fo_kqfilter
+ *
+ * Description: Generic fileops kqueue filter indirected through the fileops
+ * pointer in the fileproc structure
+ *
+ * Parameters: fp fileproc structure pointer
+ * kn pointer to knote to filter on
+ *
+ * Returns: (kn->kn_flags & EV_ERROR) error in kn->kn_data
+ * 0 Filter is not active
+ * !0 Filter is active
+ */
int
-frele(struct file *fp)
+fo_kqfilter(struct fileproc *fp, struct knote *kn, struct kevent_qos_s *kev)
{
- if (--fp->f_count < 0)
- panic("frele: count < 0");
- return ((int)fp->f_count);
+ return (*fp->f_ops->fo_kqfilter)(fp, kn, kev);
}
int
-fcount(struct file *fp)
+fo_no_kqfilter(struct fileproc *fp, struct knote *kn, struct kevent_qos_s *kev)
+{
+#pragma unused(fp, kev)
+ knote_set_error(kn, ENOTSUP);
+ return 0;
+}
+
+
+struct fileproc *
+fileproc_alloc_init(__unused void *arg)
+{
+ struct fileproc *fp = zalloc_flags(fp_zone, Z_WAITOK | Z_ZERO);
+
+ os_ref_init(&fp->fp_iocount, &f_refgrp);
+ return fp;
+}
+
+
+void
+fileproc_free(struct fileproc *fp)
+{
+ os_ref_count_t __unused refc = os_ref_release(&fp->fp_iocount);
+#if DEVELOPMENT || DEBUG
+ if (0 != refc) {
+ panic("%s: pid %d refc: %u != 0",
+ __func__, proc_pid(current_proc()), refc);
+ }
+#endif
+ switch (FILEPROC_TYPE(fp)) {
+ case FTYPE_SIMPLE:
+ zfree(fp_zone, fp);
+ break;
+ case FTYPE_GUARDED:
+ guarded_fileproc_free(fp);
+ break;
+ default:
+ panic("%s: corrupt fp %p flags %x", __func__, fp, fp->fp_flags);
+ }
+}
+
+void
+fileproc_modify_vflags(struct fileproc *fp, fileproc_vflags_t vflags, boolean_t clearflags)
{
- return ((int)fp->f_count);
+ if (clearflags) {
+ os_atomic_andnot(&fp->fp_vflags, vflags, relaxed);
+ } else {
+ os_atomic_or(&fp->fp_vflags, vflags, relaxed);
+ }
}
+fileproc_vflags_t
+fileproc_get_vflags(struct fileproc *fp)
+{
+ return os_atomic_load(&fp->fp_vflags, relaxed);
+}
projects / apple / xnu.git / blobdiff