/*
- * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
*
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
*
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* Copyright (c) 1990, 1996-1998 Apple Computer, Inc.
* Created for MacOSX
*
*/
+/*
+ * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
+ * support for mandatory and extensible security protections. This notice
+ * is included in support of clause 2.2 (b) of the Apple Public License,
+ * Version 2.0.
+ */
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
-#include <sys/file.h>
+#include <sys/file_internal.h>
#include <sys/filedesc.h>
#include <sys/stat.h>
-#include <sys/buf.h>
-#include <sys/proc.h>
+#include <sys/proc_internal.h>
+#include <sys/kauth.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/vnode.h>
+#include <sys/vnode_internal.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/malloc.h>
#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/sysproto.h>
+#include <sys/proc_info.h>
+#include <security/audit/audit.h>
-#include <bsm/audit_kernel.h>
+#if CONFIG_MACF
+#include <security/mac_framework.h>
+#endif
#include <mach/mach_types.h>
+#include <mach/mach_vm.h>
+#include <mach/vm_map.h>
#include <mach/vm_prot.h>
#include <mach/vm_inherit.h>
#include <mach/kern_return.h>
#include <mach/memory_object_control.h>
+#include <vm/vm_map.h>
+#include <vm/vm_protos.h>
+#define f_flag f_fglob->fg_flag
+#define f_type f_fglob->fg_ops->fo_type
+#define f_msgcount f_fglob->fg_msgcount
+#define f_cred f_fglob->fg_cred
+#define f_ops f_fglob->fg_ops
+#define f_offset f_fglob->fg_offset
+#define f_data f_fglob->fg_data
#define PSHMNAMLEN 31 /* maximum name segment length we bother with */
+struct pshmobj {
+ void * pshmo_memobject;
+ memory_object_size_t pshmo_size;
+ struct pshmobj * pshmo_next;
+};
+
struct pshminfo {
unsigned int pshm_flags;
unsigned int pshm_usecount;
uid_t pshm_uid;
gid_t pshm_gid;
char pshm_name[PSHMNAMLEN + 1]; /* segment name */
- void * pshm_memobject;
+ struct pshmobj *pshm_memobjects;
#if DIAGNOSTIC
unsigned int pshm_readcount;
unsigned int pshm_writecount;
- struct proc * pshm_proc;
+ proc_t pshm_proc;
#endif /* DIAGNOSTIC */
+ struct label* pshm_label;
};
#define PSHMINFO_NULL (struct pshminfo *)0
-#define PSHM_NONE 1
-#define PSHM_DEFINED 2
-#define PSHM_ALLOCATED 4
-#define PSHM_MAPPED 8
-#define PSHM_INUSE 0x10
-#define PSHM_REMOVED 0x20
-#define PSHM_INCREATE 0x40
-#define PSHM_INDELETE 0x80
+#define PSHM_NONE 0x001
+#define PSHM_DEFINED 0x002
+#define PSHM_ALLOCATED 0x004
+#define PSHM_MAPPED 0x008
+#define PSHM_INUSE 0x010
+#define PSHM_REMOVED 0x020
+#define PSHM_INCREATE 0x040
+#define PSHM_INDELETE 0x080
+#define PSHM_ALLOCATING 0x100
struct pshmcache {
LIST_ENTRY(pshmcache) pshm_hash; /* hash chain */
};
#define PSHMCACHE_NULL (struct pshmcache *)0
+#define PSHMCACHE_NOTFOUND (0)
+#define PSHMCACHE_FOUND (-1)
+#define PSHMCACHE_NEGATIVE (ENOENT)
+
struct pshmstats {
long goodhits; /* hits that we can really use */
long neghits; /* negative hits that we can use */
};
struct pshmnode {
- off_t mapp_addr;
- size_t map_size;
+ off_t mapp_addr;
+ user_size_t map_size; /* XXX unused ? */
struct pshminfo *pinfo;
unsigned int pshm_usecount;
#if DIAGNOSTIC
#define PSHMHASH(pnp) \
(&pshmhashtbl[(pnp)->pshm_hash & pshmhash])
+
LIST_HEAD(pshmhashhead, pshmcache) *pshmhashtbl; /* Hash Table */
u_long pshmhash; /* size of hash table - 1 */
long pshmnument; /* number of cache entries allocated */
struct pshmstats pshmstats; /* cache effectiveness statistics */
-static int pshm_read __P((struct file *fp, struct uio *uio,
- struct ucred *cred, int flags, struct proc *p));
-static int pshm_write __P((struct file *fp, struct uio *uio,
- struct ucred *cred, int flags, struct proc *p));
-static int pshm_ioctl __P((struct file *fp, u_long com,
- caddr_t data, struct proc *p));
-static int pshm_select __P((struct file *fp, int which, void *wql,
- struct proc *p));
-static int pshm_closefile __P((struct file *fp, struct proc *p));
+static int pshm_read (struct fileproc *fp, struct uio *uio,
+ int flags, vfs_context_t ctx);
+static int pshm_write (struct fileproc *fp, struct uio *uio,
+ int flags, vfs_context_t ctx);
+static int pshm_ioctl (struct fileproc *fp, u_long com,
+ caddr_t data, vfs_context_t ctx);
+static int pshm_select (struct fileproc *fp, int which, void *wql, vfs_context_t ctx);
+static int pshm_close(struct pshminfo *pinfo, int dropref);
+static int pshm_closefile (struct fileglob *fg, vfs_context_t ctx);
+
+static int pshm_kqfilter(struct fileproc *fp, struct knote *kn, vfs_context_t ctx);
+
+int pshm_access(struct pshminfo *pinfo, int mode, kauth_cred_t cred, proc_t p);
+int pshm_cache_purge_all(proc_t p);
+
+static int pshm_cache_add(struct pshminfo *pshmp, struct pshmname *pnp, struct pshmcache *pcp);
+static void pshm_cache_delete(struct pshmcache *pcp);
+static int pshm_cache_search(struct pshminfo **pshmp, struct pshmname *pnp,
+ struct pshmcache **pcache, int addref);
+static int pshm_unlink_internal(struct pshminfo *pinfo, struct pshmcache *pcache);
+
+static const struct fileops pshmops = {
+ DTYPE_PSXSHM,
+ pshm_read,
+ pshm_write,
+ pshm_ioctl,
+ pshm_select,
+ pshm_closefile,
+ pshm_kqfilter,
+ 0
+};
-static int pshm_kqfilter __P((struct file *fp, struct knote *kn, struct proc *p));
+static lck_grp_t *psx_shm_subsys_lck_grp;
+static lck_grp_attr_t *psx_shm_subsys_lck_grp_attr;
+static lck_attr_t *psx_shm_subsys_lck_attr;
+static lck_mtx_t psx_shm_subsys_mutex;
-struct fileops pshmops =
- { pshm_read, pshm_write, pshm_ioctl, pshm_select, pshm_closefile, pshm_kqfilter };
+#define PSHM_SUBSYS_LOCK() lck_mtx_lock(& psx_shm_subsys_mutex)
+#define PSHM_SUBSYS_UNLOCK() lck_mtx_unlock(& psx_shm_subsys_mutex)
+#define PSHM_SUBSYS_ASSERT_HELD() lck_mtx_assert(&psx_shm_subsys_mutex, LCK_MTX_ASSERT_OWNED)
+
+
+/* Initialize the mutex governing access to the posix shm subsystem */
+__private_extern__ void
+pshm_lock_init( void )
+{
+
+ psx_shm_subsys_lck_grp_attr = lck_grp_attr_alloc_init();
+
+ psx_shm_subsys_lck_grp = lck_grp_alloc_init("posix shared memory", psx_shm_subsys_lck_grp_attr);
+
+ psx_shm_subsys_lck_attr = lck_attr_alloc_init();
+ lck_mtx_init(& psx_shm_subsys_mutex, psx_shm_subsys_lck_grp, psx_shm_subsys_lck_attr);
+}
/*
* Lookup an entry in the cache
* fails, a status of zero is returned.
*/
-int
-pshm_cache_search(pshmp, pnp, pcache)
- struct pshminfo **pshmp;
- struct pshmname *pnp;
- struct pshmcache **pcache;
+static int
+pshm_cache_search(struct pshminfo **pshmp, struct pshmname *pnp,
+ struct pshmcache **pcache, int addref)
{
- register struct pshmcache *pcp, *nnp;
- register struct pshmhashhead *pcpp;
+ struct pshmcache *pcp, *nnp;
+ struct pshmhashhead *pcpp;
if (pnp->pshm_namelen > PSHMNAMLEN) {
pshmstats.longnames++;
- return (0);
+ return PSHMCACHE_NOTFOUND;
}
pcpp = PSHMHASH(pnp);
if (pcp == 0) {
pshmstats.miss++;
- return (0);
+ return PSHMCACHE_NOTFOUND;
}
/* We found a "positive" match, return the vnode */
/* TOUCH(ncp); */
*pshmp = pcp->pshminfo;
*pcache = pcp;
- return (-1);
+ if (addref)
+ pcp->pshminfo->pshm_usecount++;
+ return PSHMCACHE_FOUND;
}
/*
* We found a "negative" match, ENOENT notifies client of this match.
- * The nc_vpid field records whether this is a whiteout.
*/
pshmstats.neghits++;
- return (ENOENT);
+ return PSHMCACHE_NEGATIVE;
}
/*
* Add an entry to the cache.
+ * XXX should be static?
*/
-int
-pshm_cache_add(pshmp, pnp)
- struct pshminfo *pshmp;
- struct pshmname *pnp;
+static int
+pshm_cache_add(struct pshminfo *pshmp, struct pshmname *pnp, struct pshmcache *pcp)
{
- register struct pshmcache *pcp;
- register struct pshmhashhead *pcpp;
+ struct pshmhashhead *pcpp;
struct pshminfo *dpinfo;
struct pshmcache *dpcp;
#if DIAGNOSTIC
- if (pnp->pshm_namelen > NCHNAMLEN)
+ if (pnp->pshm_namelen > PSHMNAMLEN)
panic("cache_enter: name too long");
#endif
- /*
- * We allocate a new entry if we are less than the maximum
- * allowed and the one at the front of the LRU list is in use.
- * Otherwise we use the one at the front of the LRU list.
- */
- pcp = (struct pshmcache *)_MALLOC(sizeof(struct pshmcache), M_SHM, M_WAITOK);
+
/* if the entry has already been added by some one else return */
- if (pshm_cache_search(&dpinfo, pnp, &dpcp) == -1) {
- _FREE(pcp, M_SHM);
- return(EEXIST);
+ if (pshm_cache_search(&dpinfo, pnp, &dpcp, 0) == PSHMCACHE_FOUND) {
+ return EEXIST;
}
pshmnument++;
- bzero(pcp, sizeof(struct pshmcache));
/*
* Fill in cache info, if vp is NULL this is a "negative" cache entry.
- * For negative entries, we have to record whether it is a whiteout.
- * the whiteout flag is stored in the nc_vpid field which is
- * otherwise unused.
*/
pcp->pshminfo = pshmp;
pcp->pshm_nlen = pnp->pshm_namelen;
pcpp = PSHMHASH(pnp);
#if DIAGNOSTIC
{
- register struct pshmcache *p;
+ struct pshmcache *p;
for (p = pcpp->lh_first; p != 0; p = p->pshm_hash.le_next)
if (p == pcp)
}
#endif
LIST_INSERT_HEAD(pcpp, pcp, pshm_hash);
- return(0);
+ return 0;
}
/*
* Name cache initialization, from vfs_init() when we are booting
*/
void
-pshm_cache_init()
+pshm_cache_init(void)
{
- pshmhashtbl = hashinit(desiredvnodes, M_SHM, &pshmhash);
+ pshmhashtbl = hashinit(desiredvnodes / 8, M_SHM, &pshmhash);
}
/*
- * Invalidate a all entries to particular vnode.
- *
+ * Invalidate all entries and delete all objects associated with it. Entire
+ * non Kernel entries are going away. Just dump'em all
+ *
* We actually just increment the v_id, that will do it. The entries will
* be purged by lookup as they get found. If the v_id wraps around, we
* need to ditch the entire cache, to avoid confusion. No valid vnode will
* ever have (v_id == 0).
*/
-void
-pshm_cache_purge(void)
+int
+pshm_cache_purge_all(__unused proc_t p)
{
- struct pshmcache *pcp;
+ struct pshmcache *pcp, *tmppcp;
struct pshmhashhead *pcpp;
+ int error = 0;
+
+ if (kauth_cred_issuser(kauth_cred_get()) == 0)
+ return EPERM;
+ PSHM_SUBSYS_LOCK();
for (pcpp = &pshmhashtbl[pshmhash]; pcpp >= pshmhashtbl; pcpp--) {
- while (pcp = pcpp->lh_first)
- pshm_cache_delete(pcp);
+ LIST_FOREACH_SAFE(pcp, pcpp, pshm_hash, tmppcp) {
+ assert(pcp->pshm_nlen);
+ error = pshm_unlink_internal(pcp->pshminfo, pcp);
+ if (error)
+ goto out;
+ }
}
+ assert(pshmnument == 0);
+
+out:
+ PSHM_SUBSYS_UNLOCK();
+
+ if (error)
+ printf("%s: Error %d removing shm cache: %ld remain!\n",
+ __func__, error, pshmnument);
+ return error;
}
-pshm_cache_delete(pcp)
- struct pshmcache *pcp;
+static void
+pshm_cache_delete(struct pshmcache *pcp)
{
#if DIAGNOSTIC
if (pcp->pshm_hash.le_prev == 0)
}
-struct shm_open_args {
- const char *name;
- int oflag;
- int mode;
-};
-
int
-shm_open(p, uap, retval)
- struct proc *p;
- register struct shm_open_args *uap;
- register_t *retval;
+shm_open(proc_t p, struct shm_open_args *uap, int32_t *retval)
{
- register struct filedesc *fdp = p->p_fd;
- register struct file *fp;
- register struct vnode *vp;
- int i;
- struct file *nfp;
- int type, indx, error;
+ size_t i;
+ int indx, error;
struct pshmname nd;
struct pshminfo *pinfo;
- extern struct fileops pshmops;
- char * pnbuf;
+ struct fileproc *fp = NULL;
+ char *pnbuf = NULL;
+ struct pshminfo *new_pinfo = PSHMINFO_NULL;
+ struct pshmnode *new_pnode = PSHMNODE_NULL;
+ struct pshmcache *pcache = PSHMCACHE_NULL; /* ignored on return */
char * nameptr;
char * cp;
size_t pathlen, plen;
int fmode ;
int cmode = uap->mode;
int incache = 0;
- struct pshmnode * pnode = PSHMNODE_NULL;
- struct pshmcache * pcache = PSHMCACHE_NULL;
- int pinfo_alloc=0;
+ struct pshmcache *pcp = NULL;
AUDIT_ARG(fflags, uap->oflag);
AUDIT_ARG(mode, uap->mode);
+
pinfo = PSHMINFO_NULL;
- MALLOC_ZONE(pnbuf, caddr_t,
- MAXPATHLEN, M_NAMEI, M_WAITOK);
+ /*
+ * Preallocate everything we might need up front to avoid taking
+ * and dropping the lock, opening us up to race conditions.
+ */
+ MALLOC_ZONE(pnbuf, caddr_t, MAXPATHLEN, M_NAMEI, M_WAITOK);
+ if (pnbuf == NULL) {
+ error = ENOSPC;
+ goto bad;
+ }
+
pathlen = MAXPATHLEN;
- error = copyinstr((void *)uap->name, (void *)pnbuf,
- MAXPATHLEN, &pathlen);
+ error = copyinstr(uap->name, (void *)pnbuf, MAXPATHLEN, &pathlen);
if (error) {
goto bad;
}
error = ENAMETOOLONG;
goto bad;
}
-
-
#ifdef PSXSHM_NAME_RESTRICT
nameptr = pnbuf;
if (*nameptr == '/') {
error = EINVAL;
goto bad;
}
- } else {
+ } else {
error = EINVAL;
goto bad;
}
nd.pshm_namelen = plen;
nd. pshm_hash =0;
- for (cp = nameptr, i=1; *cp != 0 && i <= plen; i++, cp++) {
- nd.pshm_hash += (unsigned char)*cp * i;
+ for (cp = nameptr, i=1; *cp != 0 && i <= plen; i++, cp++) {
+ nd.pshm_hash += (unsigned char)*cp * i;
}
- error = pshm_cache_search(&pinfo, &nd, &pcache);
+ /*
+ * attempt to allocate a new fp; if unsuccessful, the fp will be
+ * left unmodified (NULL).
+ */
+ error = falloc(p, &fp, &indx, vfs_context_current());
+ if (error)
+ goto bad;
+
+ cmode &= ALLPERMS;
- if (error == ENOENT) {
+ fmode = FFLAGS(uap->oflag);
+ if ((fmode & (FREAD | FWRITE)) == 0) {
error = EINVAL;
goto bad;
+ }
+ /*
+ * We allocate a new entry if we are less than the maximum
+ * allowed and the one at the front of the LRU list is in use.
+ * Otherwise we use the one at the front of the LRU list.
+ */
+ MALLOC(pcp, struct pshmcache *, sizeof(struct pshmcache), M_SHM, M_WAITOK|M_ZERO);
+ if (pcp == NULL) {
+ error = ENOSPC;
+ goto bad;
}
- if (!error) {
- incache = 0;
- } else
- incache = 1;
- fmode = FFLAGS(uap->oflag);
- if ((fmode & (FREAD | FWRITE))==0) {
- error = EINVAL;
+
+ MALLOC(new_pinfo, struct pshminfo *, sizeof(struct pshminfo), M_SHM, M_WAITOK|M_ZERO);
+ if (new_pinfo == PSHMINFO_NULL) {
+ error = ENOSPC;
goto bad;
}
+#if CONFIG_MACF
+ mac_posixshm_label_init(new_pinfo);
+#endif
- if (error = falloc(p, &nfp, &indx))
+ MALLOC(new_pnode, struct pshmnode *, sizeof(struct pshmnode), M_SHM, M_WAITOK|M_ZERO);
+ if (new_pnode == PSHMNODE_NULL) {
+ error = ENOSPC;
goto bad;
- fp = nfp;
+ }
- cmode &= ALLPERMS;
+ PSHM_SUBSYS_LOCK();
- if (fmode & O_CREAT) {
- if ((fmode & O_EXCL) && incache) {
- AUDIT_ARG(posix_ipc_perm, pinfo->pshm_uid,
- pinfo->pshm_gid, pinfo->pshm_mode);
-
- /* shm obj exists and opened O_EXCL */
-#if notyet
- if (pinfo->pshm_flags & PSHM_INDELETE) {
- }
-#endif
- error = EEXIST;
- goto bad1;
- }
- if (!incache) {
- /* create a new one */
- pinfo = (struct pshminfo *)_MALLOC(sizeof(struct pshminfo), M_SHM, M_WAITOK);
- bzero(pinfo, sizeof(struct pshminfo));
- pinfo_alloc = 1;
- pinfo->pshm_flags = PSHM_DEFINED | PSHM_INCREATE;
- pinfo->pshm_usecount = 1;
- pinfo->pshm_mode = cmode;
- pinfo->pshm_uid = p->p_ucred->cr_uid;
- pinfo->pshm_gid = p->p_ucred->cr_gid;
- } else {
- /* already exists */
- if( pinfo->pshm_flags & PSHM_INDELETE) {
- error = ENOENT;
- goto bad1;
- }
- AUDIT_ARG(posix_ipc_perm, pinfo->pshm_uid,
- pinfo->pshm_gid, pinfo->pshm_mode);
- if (error = pshm_access(pinfo, fmode, p->p_ucred, p))
- goto bad1;
- }
+ /*
+ * If we find the entry in the cache, this will take a reference,
+ * allowing us to unlock it for the permissions check.
+ */
+ error = pshm_cache_search(&pinfo, &nd, &pcache, 1);
+
+ PSHM_SUBSYS_UNLOCK();
+
+ if (error == PSHMCACHE_NEGATIVE) {
+ error = EINVAL;
+ goto bad;
+ }
+
+ if (error == PSHMCACHE_NOTFOUND) {
+ incache = 0;
+ if (fmode & O_CREAT) {
+ /* create a new one (commit the allocation) */
+ pinfo = new_pinfo;
+ pinfo->pshm_flags = PSHM_DEFINED | PSHM_INCREATE;
+ pinfo->pshm_usecount = 1; /* existence reference */
+ pinfo->pshm_mode = cmode;
+ pinfo->pshm_uid = kauth_getuid();
+ pinfo->pshm_gid = kauth_getgid();
+ bcopy(pnbuf, &pinfo->pshm_name[0], pathlen);
+ pinfo->pshm_name[pathlen]=0;
+#if CONFIG_MACF
+ error = mac_posixshm_check_create(kauth_cred_get(), nameptr);
+ if (error) {
+ goto bad;
+ }
+ mac_posixshm_label_associate(kauth_cred_get(), pinfo, nameptr);
+#endif
+ }
} else {
+ incache = 1;
+ if (fmode & O_CREAT) {
+ /* already exists */
+ if ((fmode & O_EXCL)) {
+ AUDIT_ARG(posix_ipc_perm, pinfo->pshm_uid,
+ pinfo->pshm_gid,
+ pinfo->pshm_mode);
+
+ /* shm obj exists and opened O_EXCL */
+ error = EEXIST;
+ goto bad;
+ }
+
+ if( pinfo->pshm_flags & PSHM_INDELETE) {
+ error = ENOENT;
+ goto bad;
+ }
+ AUDIT_ARG(posix_ipc_perm, pinfo->pshm_uid,
+ pinfo->pshm_gid, pinfo->pshm_mode);
+#if CONFIG_MACF
+ if ((error = mac_posixshm_check_open(kauth_cred_get(), pinfo, fmode))) {
+ goto bad;
+ }
+#endif
+ if ( (error = pshm_access(pinfo, fmode, kauth_cred_get(), p)) ) {
+ goto bad;
+ }
+ }
+ }
+ if (!(fmode & O_CREAT)) {
if (!incache) {
- /* O_CREAT is not set and the shm obecj does not exist */
+ /* O_CREAT is not set and the object does not exist */
error = ENOENT;
- goto bad1;
+ goto bad;
}
if( pinfo->pshm_flags & PSHM_INDELETE) {
error = ENOENT;
- goto bad1;
+ goto bad;
}
- if (error = pshm_access(pinfo, fmode, p->p_ucred, p))
- goto bad1;
+#if CONFIG_MACF
+ if ((error = mac_posixshm_check_open(kauth_cred_get(), pinfo, fmode))) {
+ goto bad;
+ }
+#endif
+
+ if ((error = pshm_access(pinfo, fmode, kauth_cred_get(), p))) {
+ goto bad;
+ }
}
if (fmode & O_TRUNC) {
error = EINVAL;
- goto bad2;
+ goto bad;
}
+
+
+ PSHM_SUBSYS_LOCK();
+
#if DIAGNOSTIC
if (fmode & FWRITE)
pinfo->pshm_writecount++;
if (fmode & FREAD)
pinfo->pshm_readcount++;
#endif
- pnode = (struct pshmnode *)_MALLOC(sizeof(struct pshmnode), M_SHM, M_WAITOK);
- bzero(pnode, sizeof(struct pshmnode));
-
if (!incache) {
- if (error = pshm_cache_add(pinfo, &nd)) {
- goto bad3;
+ /* if successful, this will consume the pcp */
+ if ( (error = pshm_cache_add(pinfo, &nd, pcp)) ) {
+ goto bad_locked;
}
+ /*
+ * add reference for the new entry; otherwise, we obtained
+ * one from the cache hit earlier.
+ */
+ pinfo->pshm_usecount++;
}
pinfo->pshm_flags &= ~PSHM_INCREATE;
- pinfo->pshm_usecount++;
- pnode->pinfo = pinfo;
+ new_pnode->pinfo = pinfo;
+
+ PSHM_SUBSYS_UNLOCK();
+
+ /*
+ * if incache, we did not use the new pcp or new_pinfo and must
+ * free them
+ */
+ if (incache) {
+ FREE(pcp, M_SHM);
+
+ if (new_pinfo != PSHMINFO_NULL) {
+#if CONFIG_MACF
+ mac_posixshm_label_destroy(new_pinfo);
+#endif
+ FREE(new_pinfo, M_SHM);
+ }
+ }
+
+ proc_fdlock(p);
fp->f_flag = fmode & FMASK;
- fp->f_type = DTYPE_PSXSHM;
fp->f_ops = &pshmops;
- fp->f_data = (caddr_t)pnode;
- *fdflags(p, indx) &= ~UF_RESERVED;
+ fp->f_data = (caddr_t)new_pnode;
+ *fdflags(p, indx) |= UF_EXCLOSE;
+ procfdtbl_releasefd(p, indx, NULL);
+ fp_drop(p, indx, fp, 1);
+ proc_fdunlock(p);
+
*retval = indx;
FREE_ZONE(pnbuf, MAXPATHLEN, M_NAMEI);
return (0);
-bad3:
- _FREE(pnode, M_SHM);
-
-bad2:
- if (pinfo_alloc)
- _FREE(pinfo, M_SHM);
-bad1:
- fdrelse(p, indx);
- ffree(nfp);
+
+bad_locked:
+ PSHM_SUBSYS_UNLOCK();
bad:
- FREE_ZONE(pnbuf, MAXPATHLEN, M_NAMEI);
+ /*
+ * If we obtained the entry from the cache, we need to drop the
+ * reference; holding the reference may have prevented unlinking,
+ * so we need to call pshm_close() to get the full effect.
+ */
+ if (incache) {
+ PSHM_SUBSYS_LOCK();
+ pshm_close(pinfo, 1);
+ PSHM_SUBSYS_UNLOCK();
+ }
+
+ if (pcp != NULL)
+ FREE(pcp, M_SHM);
+
+ if (new_pnode != PSHMNODE_NULL)
+ FREE(new_pnode, M_SHM);
+
+ if (fp != NULL)
+ fp_free(p, indx, fp);
+
+ if (new_pinfo != PSHMINFO_NULL) {
+#if CONFIG_MACF
+ mac_posixshm_label_destroy(new_pinfo);
+#endif
+ FREE(new_pinfo, M_SHM);
+ }
+ if (pnbuf != NULL)
+ FREE_ZONE(pnbuf, MAXPATHLEN, M_NAMEI);
return (error);
}
-/* ARGSUSED */
int
-pshm_truncate(p, fp, fd, length, retval)
- struct proc *p;
- struct file *fp;
- int fd;
- off_t length;
- register_t *retval;
+pshm_truncate(__unused proc_t p, struct fileproc *fp, __unused int fd,
+ off_t length, __unused int32_t *retval)
{
struct pshminfo * pinfo;
struct pshmnode * pnode ;
kern_return_t kret;
- vm_offset_t user_addr;
- void * mem_object;
- vm_size_t size;
+ mem_entry_name_port_t mem_object;
+ mach_vm_size_t total_size, alloc_size;
+ memory_object_size_t mosize;
+ struct pshmobj *pshmobj, *pshmobj_next, **pshmobj_next_p;
+ vm_map_t user_map;
+#if CONFIG_MACF
+ int error;
+#endif
+
+ user_map = current_map();
if (fp->f_type != DTYPE_PSXSHM) {
return(EINVAL);
if (((pnode = (struct pshmnode *)fp->f_data)) == PSHMNODE_NULL )
return(EINVAL);
- if ((pinfo = pnode->pinfo) == PSHMINFO_NULL)
+ PSHM_SUBSYS_LOCK();
+ if ((pinfo = pnode->pinfo) == PSHMINFO_NULL) {
+ PSHM_SUBSYS_UNLOCK();
return(EINVAL);
- if ((pinfo->pshm_flags & (PSHM_DEFINED | PSHM_ALLOCATED))
+ }
+ if ((pinfo->pshm_flags & (PSHM_DEFINED|PSHM_ALLOCATING|PSHM_ALLOCATED))
!= PSHM_DEFINED) {
+ PSHM_SUBSYS_UNLOCK();
return(EINVAL);
}
+#if CONFIG_MACF
+ error = mac_posixshm_check_truncate(kauth_cred_get(), pinfo, length);
+ if (error) {
+ PSHM_SUBSYS_UNLOCK();
+ return(error);
+ }
+#endif
- size = round_page_64(length);
- kret = vm_allocate(current_map(), &user_addr, size, TRUE);
- if (kret != KERN_SUCCESS)
- goto out;
+ pinfo->pshm_flags |= PSHM_ALLOCATING;
+ total_size = vm_map_round_page(length,
+ vm_map_page_mask(user_map));
+ pshmobj_next_p = &pinfo->pshm_memobjects;
- kret = mach_make_memory_entry (current_map(), &size,
- user_addr, VM_PROT_DEFAULT, &mem_object, 0);
+ for (alloc_size = 0;
+ alloc_size < total_size;
+ alloc_size += mosize) {
- if (kret != KERN_SUCCESS)
- goto out;
-
- vm_deallocate(current_map(), user_addr, size);
+ PSHM_SUBSYS_UNLOCK();
+
+ mosize = MIN(total_size - alloc_size, ANON_MAX_SIZE);
+ kret = mach_make_memory_entry_64(
+ VM_MAP_NULL,
+ &mosize,
+ 0,
+ MAP_MEM_NAMED_CREATE | VM_PROT_DEFAULT,
+ &mem_object,
+ 0);
+
+ if (kret != KERN_SUCCESS)
+ goto out;
+
+ MALLOC(pshmobj, struct pshmobj *, sizeof (struct pshmobj),
+ M_SHM, M_WAITOK);
+ if (pshmobj == NULL) {
+ kret = KERN_NO_SPACE;
+ mach_memory_entry_port_release(mem_object);
+ mem_object = NULL;
+ goto out;
+ }
+
+ PSHM_SUBSYS_LOCK();
- pinfo->pshm_flags &= ~PSHM_DEFINED;
- pinfo->pshm_flags = PSHM_ALLOCATED;
- pinfo->pshm_memobject = mem_object;
- pinfo->pshm_length = size;
+ pshmobj->pshmo_memobject = (void *) mem_object;
+ pshmobj->pshmo_size = mosize;
+ pshmobj->pshmo_next = NULL;
+
+ *pshmobj_next_p = pshmobj;
+ pshmobj_next_p = &pshmobj->pshmo_next;
+ }
+
+ pinfo->pshm_flags |= PSHM_ALLOCATED;
+ pinfo->pshm_flags &= ~(PSHM_ALLOCATING);
+ pinfo->pshm_length = total_size;
+ PSHM_SUBSYS_UNLOCK();
return(0);
out:
+ PSHM_SUBSYS_LOCK();
+ for (pshmobj = pinfo->pshm_memobjects;
+ pshmobj != NULL;
+ pshmobj = pshmobj_next) {
+ pshmobj_next = pshmobj->pshmo_next;
+ mach_memory_entry_port_release(pshmobj->pshmo_memobject);
+ FREE(pshmobj, M_SHM);
+ }
+ pinfo->pshm_memobjects = NULL;
+ pinfo->pshm_flags &= ~PSHM_ALLOCATING;
+ PSHM_SUBSYS_UNLOCK();
+
switch (kret) {
case KERN_INVALID_ADDRESS:
case KERN_NO_SPACE:
}
int
-pshm_stat(pnode, sb)
-struct pshmnode *pnode;
-struct stat *sb;
+pshm_stat(struct pshmnode *pnode, void *ub, int isstat64)
{
+ struct stat *sb = (struct stat *)0; /* warning avoidance ; protected by isstat64 */
+ struct stat64 * sb64 = (struct stat64 *)0; /* warning avoidance ; protected by isstat64 */
struct pshminfo *pinfo;
+#if CONFIG_MACF
+ int error;
+#endif
- if ((pinfo = pnode->pinfo) == PSHMINFO_NULL)
+ PSHM_SUBSYS_LOCK();
+ if ((pinfo = pnode->pinfo) == PSHMINFO_NULL){
+ PSHM_SUBSYS_UNLOCK();
return(EINVAL);
+ }
- bzero(sb, sizeof(struct stat));
- sb->st_mode = pinfo->pshm_mode;
- sb->st_uid = pinfo->pshm_uid;
- sb->st_gid = pinfo->pshm_gid;
- sb->st_size = pinfo->pshm_length;
+#if CONFIG_MACF
+ error = mac_posixshm_check_stat(kauth_cred_get(), pinfo);
+ if (error) {
+ PSHM_SUBSYS_UNLOCK();
+ return(error);
+ }
+#endif
+
+ if (isstat64 != 0) {
+ sb64 = (struct stat64 *)ub;
+ bzero(sb64, sizeof(struct stat64));
+ sb64->st_mode = pinfo->pshm_mode;
+ sb64->st_uid = pinfo->pshm_uid;
+ sb64->st_gid = pinfo->pshm_gid;
+ sb64->st_size = pinfo->pshm_length;
+ } else {
+ sb = (struct stat *)ub;
+ bzero(sb, sizeof(struct stat));
+ sb->st_mode = pinfo->pshm_mode;
+ sb->st_uid = pinfo->pshm_uid;
+ sb->st_gid = pinfo->pshm_gid;
+ sb->st_size = pinfo->pshm_length;
+ }
+ PSHM_SUBSYS_UNLOCK();
return(0);
}
+/*
+ * This is called only from shm_open which holds pshm_lock();
+ * XXX This code is repeated many times
+ */
int
-pshm_access(struct pshminfo *pinfo, int mode, struct ucred *cred, struct proc *p)
+pshm_access(struct pshminfo *pinfo, int mode, kauth_cred_t cred, __unused proc_t p)
{
- mode_t mask;
- register gid_t *gp;
- int i, error;
+ int mode_req = ((mode & FREAD) ? S_IRUSR : 0) |
+ ((mode & FWRITE) ? S_IWUSR : 0);
/* Otherwise, user id 0 always gets access. */
- if (cred->cr_uid == 0)
+ if (!suser(cred, NULL))
return (0);
- mask = 0;
-
- /* Otherwise, check the owner. */
- if (cred->cr_uid == pinfo->pshm_uid) {
- if (mode & FREAD)
- mask |= S_IRUSR;
- if (mode & FWRITE)
- mask |= S_IWUSR;
- return ((pinfo->pshm_mode & mask) == mask ? 0 : EACCES);
- }
-
- /* Otherwise, check the groups. */
- for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++)
- if (pinfo->pshm_gid == *gp) {
- if (mode & FREAD)
- mask |= S_IRGRP;
- if (mode & FWRITE)
- mask |= S_IWGRP;
- return ((pinfo->pshm_mode & mask) == mask ? 0 : EACCES);
- }
-
- /* Otherwise, check everyone else. */
- if (mode & FREAD)
- mask |= S_IROTH;
- if (mode & FWRITE)
- mask |= S_IWOTH;
- return ((pinfo->pshm_mode & mask) == mask ? 0 : EACCES);
+ return(posix_cred_access(cred, pinfo->pshm_uid, pinfo->pshm_gid, pinfo->pshm_mode, mode_req));
}
-struct mmap_args {
- caddr_t addr;
- size_t len;
- int prot;
- int flags;
- int fd;
-#ifdef DOUBLE_ALIGN_PARAMS
- long pad;
-#endif
- off_t pos;
-};
-
int
-pshm_mmap(struct proc *p, struct mmap_args *uap, register_t *retval, struct file *fp, vm_size_t pageoff)
+pshm_mmap(__unused proc_t p, struct mmap_args *uap, user_addr_t *retval, struct fileproc *fp, off_t pageoff)
{
- vm_offset_t user_addr = (vm_offset_t)uap->addr;
- vm_size_t user_size = (vm_size_t)uap->len ;
+ vm_map_offset_t user_addr = (vm_map_offset_t)uap->addr;
+ vm_map_size_t user_size = (vm_map_size_t)uap->len ;
+ vm_map_offset_t user_start_addr;
+ vm_map_size_t map_size, mapped_size;
int prot = uap->prot;
int flags = uap->flags;
vm_object_offset_t file_pos = (vm_object_offset_t)uap->pos;
- int fd = uap->fd;
+ vm_object_offset_t map_pos;
vm_map_t user_map;
- boolean_t find_space,docow;
+ int alloc_flags;
+ boolean_t docow;
kern_return_t kret;
struct pshminfo * pinfo;
struct pshmnode * pnode;
- void * mem_object;
+ struct pshmobj * pshmobj;
+#if CONFIG_MACF
+ int error;
+#endif
if (user_size == 0)
return(0);
if (((pnode = (struct pshmnode *)fp->f_data)) == PSHMNODE_NULL )
return(EINVAL);
- if ((pinfo = pnode->pinfo) == PSHMINFO_NULL)
+ PSHM_SUBSYS_LOCK();
+ if ((pinfo = pnode->pinfo) == PSHMINFO_NULL) {
+ PSHM_SUBSYS_UNLOCK();
return(EINVAL);
+ }
if ((pinfo->pshm_flags & PSHM_ALLOCATED) != PSHM_ALLOCATED) {
+ PSHM_SUBSYS_UNLOCK();
return(EINVAL);
}
- if (user_size > pinfo->pshm_length) {
+ if ((off_t)user_size > pinfo->pshm_length) {
+ PSHM_SUBSYS_UNLOCK();
return(EINVAL);
}
- if ((off_t)user_size + file_pos > pinfo->pshm_length) {
+ if ((off_t)(user_size + file_pos) > pinfo->pshm_length) {
+ PSHM_SUBSYS_UNLOCK();
return(EINVAL);
}
- if ((mem_object = pinfo->pshm_memobject) == NULL) {
+ if ((pshmobj = pinfo->pshm_memobjects) == NULL) {
+ PSHM_SUBSYS_UNLOCK();
return(EINVAL);
}
-
+#if CONFIG_MACF
+ error = mac_posixshm_check_mmap(kauth_cred_get(), pinfo, prot, flags);
+ if (error) {
+ PSHM_SUBSYS_UNLOCK();
+ return(error);
+ }
+#endif
+
+ PSHM_SUBSYS_UNLOCK();
user_map = current_map();
if ((flags & MAP_FIXED) == 0) {
- find_space = TRUE;
- user_addr = round_page_32(user_addr);
+ alloc_flags = VM_FLAGS_ANYWHERE;
+ user_addr = vm_map_round_page(user_addr,
+ vm_map_page_mask(user_map));
} else {
- if (user_addr != trunc_page_32(user_addr))
+ if (user_addr != vm_map_round_page(user_addr,
+ vm_map_page_mask(user_map)))
return (EINVAL);
- find_space = FALSE;
- (void) vm_deallocate(user_map, user_addr, user_size);
+ /*
+ * We do not get rid of the existing mappings here because
+ * it wouldn't be atomic (see comment in mmap()). We let
+ * Mach VM know that we want it to replace any existing
+ * mapping with the new one.
+ */
+ alloc_flags = VM_FLAGS_FIXED | VM_FLAGS_OVERWRITE;
}
docow = FALSE;
- kret = vm_map_64(user_map, &user_addr, user_size,
- 0, find_space, pinfo->pshm_memobject, file_pos, docow,
- prot, VM_PROT_DEFAULT,
- VM_INHERIT_DEFAULT);
-
- if (kret != KERN_SUCCESS)
- goto out;
- kret = vm_inherit(user_map, user_addr, user_size,
- VM_INHERIT_SHARE);
+ mapped_size = 0;
+
+ /* reserver the entire space first... */
+ kret = vm_map_enter_mem_object(user_map,
+ &user_addr,
+ user_size,
+ 0,
+ alloc_flags,
+ IPC_PORT_NULL,
+ 0,
+ FALSE,
+ VM_PROT_NONE,
+ VM_PROT_NONE,
+ VM_INHERIT_NONE);
+ user_start_addr = user_addr;
if (kret != KERN_SUCCESS) {
- (void) vm_deallocate(user_map, user_addr, user_size);
goto out;
}
- pnode->mapp_addr = user_addr;
- pnode->map_size = user_size;
+
+ /* ... and overwrite with the real mappings */
+ for (map_pos = 0, pshmobj = pinfo->pshm_memobjects;
+ user_size != 0;
+ map_pos += pshmobj->pshmo_size, pshmobj = pshmobj->pshmo_next) {
+ if (pshmobj == NULL) {
+ /* nothing there to map !? */
+ goto out;
+ }
+ if (file_pos >= map_pos + pshmobj->pshmo_size) {
+ continue;
+ }
+ map_size = pshmobj->pshmo_size - (file_pos - map_pos);
+ if (map_size > user_size) {
+ map_size = user_size;
+ }
+ kret = vm_map_enter_mem_object(
+ user_map,
+ &user_addr,
+ map_size,
+ 0,
+ VM_FLAGS_FIXED | VM_FLAGS_OVERWRITE,
+ pshmobj->pshmo_memobject,
+ file_pos - map_pos,
+ docow,
+ prot,
+ VM_PROT_DEFAULT,
+ VM_INHERIT_SHARE);
+ if (kret != KERN_SUCCESS)
+ goto out;
+
+ user_addr += map_size;
+ user_size -= map_size;
+ mapped_size += map_size;
+ file_pos += map_size;
+ }
+
+ PSHM_SUBSYS_LOCK();
+ pnode->mapp_addr = user_start_addr;
+ pnode->map_size = mapped_size;
pinfo->pshm_flags |= (PSHM_MAPPED | PSHM_INUSE);
+ PSHM_SUBSYS_UNLOCK();
out:
+ if (kret != KERN_SUCCESS) {
+ if (mapped_size != 0) {
+ (void) mach_vm_deallocate(current_map(),
+ user_start_addr,
+ mapped_size);
+ }
+ }
+
switch (kret) {
case KERN_SUCCESS:
- *fdflags(p, fd) |= UF_MAPPED;
- *retval = (register_t)(user_addr + pageoff);
+ *retval = (user_start_addr + pageoff);
return (0);
case KERN_INVALID_ADDRESS:
case KERN_NO_SPACE:
}
-struct shm_unlink_args {
- const char *name;
-};
+static int
+pshm_unlink_internal(struct pshminfo *pinfo, struct pshmcache *pcache)
+{
+ struct pshmobj *pshmobj, *pshmobj_next;
+
+ PSHM_SUBSYS_ASSERT_HELD();
+
+ if (!pinfo || !pcache)
+ return EINVAL;
+
+ if ((pinfo->pshm_flags & (PSHM_DEFINED | PSHM_ALLOCATED)) == 0)
+ return EINVAL;
+
+ if (pinfo->pshm_flags & PSHM_INDELETE)
+ return 0;
+
+ pinfo->pshm_flags |= PSHM_INDELETE;
+ pinfo->pshm_usecount--;
+
+ pshm_cache_delete(pcache);
+ pinfo->pshm_flags |= PSHM_REMOVED;
+
+ /* release the existence reference */
+ if (!pinfo->pshm_usecount) {
+#if CONFIG_MACF
+ mac_posixshm_label_destroy(pinfo);
+#endif
+ /*
+ * If this is the last reference going away on the object,
+ * then we need to destroy the backing object. The name
+ * has an implied but uncounted reference on the object,
+ * once it's created, since it's used as a rendezvous, and
+ * therefore may be subsequently reopened.
+ */
+ for (pshmobj = pinfo->pshm_memobjects;
+ pshmobj != NULL;
+ pshmobj = pshmobj_next) {
+ mach_memory_entry_port_release(pshmobj->pshmo_memobject);
+ pshmobj_next = pshmobj->pshmo_next;
+ FREE(pshmobj, M_SHM);
+ }
+ FREE(pinfo,M_SHM);
+ }
+
+ FREE(pcache, M_SHM);
+
+ return 0;
+}
int
-shm_unlink(p, uap, retval)
- struct proc *p;
- register struct shm_unlink_args *uap;
- register_t *retval;
+shm_unlink(proc_t p, struct shm_unlink_args *uap, __unused int32_t *retval)
{
- register struct filedesc *fdp = p->p_fd;
- register struct file *fp;
- int flags, i;
- int error=0;
+ size_t i;
+ char * pnbuf;
+ size_t pathlen;
+ int error = 0;
+
struct pshmname nd;
struct pshminfo *pinfo;
- extern struct fileops pshmops;
- char * pnbuf;
char * nameptr;
char * cp;
- size_t pathlen, plen;
- int fmode, cmode ;
- int incache = 0;
- struct pshmnode * pnode = PSHMNODE_NULL;
struct pshmcache *pcache = PSHMCACHE_NULL;
- kern_return_t kret;
pinfo = PSHMINFO_NULL;
- MALLOC_ZONE(pnbuf, caddr_t,
- MAXPATHLEN, M_NAMEI, M_WAITOK);
+
+ MALLOC_ZONE(pnbuf, caddr_t, MAXPATHLEN, M_NAMEI, M_WAITOK);
+ if (pnbuf == NULL) {
+ return(ENOSPC); /* XXX non-standard */
+ }
pathlen = MAXPATHLEN;
- error = copyinstr((void *)uap->name, (void *)pnbuf,
- MAXPATHLEN, &pathlen);
+ error = copyinstr(uap->name, (void *)pnbuf, MAXPATHLEN, &pathlen);
if (error) {
goto bad;
}
goto bad;
}
+ nameptr = pnbuf;
#ifdef PSXSHM_NAME_RESTRICT
- nameptr = pnbuf;
if (*nameptr == '/') {
while (*(nameptr++) == '/') {
- plen--;
+ pathlen--;
error = EINVAL;
goto bad;
}
}
#endif /* PSXSHM_NAME_RESTRICT */
- plen = pathlen;
- nameptr = pnbuf;
nd.pshm_nameptr = nameptr;
- nd.pshm_namelen = plen;
- nd. pshm_hash =0;
+ nd.pshm_namelen = pathlen;
+ nd.pshm_hash = 0;
- for (cp = nameptr, i=1; *cp != 0 && i <= plen; i++, cp++) {
+ for (cp = nameptr, i=1; *cp != 0 && i <= pathlen; i++, cp++) {
nd.pshm_hash += (unsigned char)*cp * i;
}
- error = pshm_cache_search(&pinfo, &nd, &pcache);
+ PSHM_SUBSYS_LOCK();
+ error = pshm_cache_search(&pinfo, &nd, &pcache, 0);
- if (error == ENOENT) {
- error = EINVAL;
+ /* During unlink lookup failure also implies ENOENT */
+ if (error != PSHMCACHE_FOUND) {
+ PSHM_SUBSYS_UNLOCK();
+ error = ENOENT;
goto bad;
}
- if (!error) {
+
+ if ((pinfo->pshm_flags & (PSHM_DEFINED | PSHM_ALLOCATED))==0) {
+ PSHM_SUBSYS_UNLOCK();
error = EINVAL;
goto bad;
- } else
- incache = 1;
+ }
- if ((pinfo->pshm_flags & (PSHM_DEFINED | PSHM_ALLOCATED))==0) {
- return (EINVAL);
+ if (pinfo->pshm_flags & PSHM_ALLOCATING) {
+ /* XXX should we wait for flag to clear and then proceed ? */
+ PSHM_SUBSYS_UNLOCK();
+ error = EAGAIN;
+ goto bad;
}
if (pinfo->pshm_flags & PSHM_INDELETE) {
+ PSHM_SUBSYS_UNLOCK();
error = 0;
goto bad;
}
- if (pinfo->pshm_memobject == NULL) {
- error = EINVAL;
+#if CONFIG_MACF
+ error = mac_posixshm_check_unlink(kauth_cred_get(), pinfo, nameptr);
+ if (error) {
+ PSHM_SUBSYS_UNLOCK();
goto bad;
}
+#endif
AUDIT_ARG(posix_ipc_perm, pinfo->pshm_uid, pinfo->pshm_gid,
pinfo->pshm_mode);
- pinfo->pshm_flags |= PSHM_INDELETE;
- pinfo->pshm_usecount--;
- kret = mach_destroy_memory_entry(pinfo->pshm_memobject);
- pshm_cache_delete(pcache);
- _FREE(pcache, M_SHM);
- pinfo->pshm_flags |= PSHM_REMOVED;
- error = 0;
+
+ /*
+ * following file semantics, unlink should be allowed
+ * for users with write permission only.
+ */
+ if ( (error = pshm_access(pinfo, FWRITE, kauth_cred_get(), p)) ) {
+ PSHM_SUBSYS_UNLOCK();
+ goto bad;
+ }
+
+ error = pshm_unlink_internal(pinfo, pcache);
+ PSHM_SUBSYS_UNLOCK();
+
bad:
FREE_ZONE(pnbuf, MAXPATHLEN, M_NAMEI);
- return (error);
-out:
- switch (kret) {
- case KERN_INVALID_ADDRESS:
- case KERN_PROTECTION_FAILURE:
- return (EACCES);
- default:
- return (EINVAL);
- }
+ return error;
}
-int
-pshm_close(pnode, flags, cred, p)
- register struct pshmnode *pnode;
- int flags;
- struct ucred *cred;
- struct proc *p;
+/* already called locked */
+static int
+pshm_close(struct pshminfo *pinfo, int dropref)
{
- int error=0;
- kern_return_t kret;
- register struct pshminfo *pinfo;
-
- if ((pinfo = pnode->pinfo) == PSHMINFO_NULL)
- return(EINVAL);
+ int error = 0;
+ struct pshmobj *pshmobj, *pshmobj_next;
- if ((pinfo->pshm_flags & PSHM_ALLOCATED) != PSHM_ALLOCATED) {
+ /*
+ * If we are dropping the reference we took on the cache object, don't
+ * enforce the allocation requirement.
+ */
+ if ( !dropref && ((pinfo->pshm_flags & PSHM_ALLOCATED) != PSHM_ALLOCATED)) {
return(EINVAL);
}
#if DIAGNOSTIC
kprintf("negative usecount in pshm_close\n");
}
#endif /* DIAGNOSTIC */
- pinfo->pshm_usecount--;
+ pinfo->pshm_usecount--; /* release this fd's reference */
if ((pinfo->pshm_flags & PSHM_REMOVED) && !pinfo->pshm_usecount) {
- _FREE(pinfo,M_SHM);
+#if CONFIG_MACF
+ mac_posixshm_label_destroy(pinfo);
+#endif
+ PSHM_SUBSYS_UNLOCK();
+ /*
+ * If this is the last reference going away on the object,
+ * then we need to destroy the backing object.
+ */
+ for (pshmobj = pinfo->pshm_memobjects;
+ pshmobj != NULL;
+ pshmobj = pshmobj_next) {
+ mach_memory_entry_port_release(pshmobj->pshmo_memobject);
+ pshmobj_next = pshmobj->pshmo_next;
+ FREE(pshmobj, M_SHM);
+ }
+ PSHM_SUBSYS_LOCK();
+ FREE(pinfo,M_SHM);
}
- _FREE(pnode, M_SHM);
return (error);
}
+/* vfs_context_t passed to match prototype for struct fileops */
static int
-pshm_closefile(fp, p)
- struct file *fp;
- struct proc *p;
+pshm_closefile(struct fileglob *fg, __unused vfs_context_t ctx)
{
- return (pshm_close(((struct pshmnode *)fp->f_data), fp->f_flag,
- fp->f_cred, p));
+ int error = EINVAL;
+ struct pshmnode *pnode;
+
+ PSHM_SUBSYS_LOCK();
+
+ if ((pnode = (struct pshmnode *)fg->fg_data) != NULL) {
+ if (pnode->pinfo != PSHMINFO_NULL) {
+ error = pshm_close(pnode->pinfo, 0);
+ }
+ FREE(pnode, M_SHM);
+ }
+
+ PSHM_SUBSYS_UNLOCK();
+
+ return(error);
}
static int
-pshm_read(fp, uio, cred, flags, p)
- struct file *fp;
- struct uio *uio;
- struct ucred *cred;
- int flags;
- struct proc *p;
+pshm_read(__unused struct fileproc *fp, __unused struct uio *uio,
+ __unused int flags, __unused vfs_context_t ctx)
{
- return(EOPNOTSUPP);
+ return(ENOTSUP);
}
static int
-pshm_write(fp, uio, cred, flags, p)
- struct file *fp;
- struct uio *uio;
- struct ucred *cred;
- int flags;
- struct proc *p;
+pshm_write(__unused struct fileproc *fp, __unused struct uio *uio,
+ __unused int flags, __unused vfs_context_t ctx)
{
- return(EOPNOTSUPP);
+ return(ENOTSUP);
}
static int
-pshm_ioctl(fp, com, data, p)
- struct file *fp;
- u_long com;
- caddr_t data;
- struct proc *p;
+pshm_ioctl(__unused struct fileproc *fp, __unused u_long com,
+ __unused caddr_t data, __unused vfs_context_t ctx)
{
- return(EOPNOTSUPP);
+ return(ENOTSUP);
}
static int
-pshm_select(fp, which, wql, p)
- struct file *fp;
- int which;
- void *wql;
- struct proc *p;
+pshm_select(__unused struct fileproc *fp, __unused int which, __unused void *wql,
+ __unused vfs_context_t ctx)
{
- return(EOPNOTSUPP);
+ return(ENOTSUP);
}
static int
-pshm_kqfilter(fp, kn, p)
- struct file *fp;
- struct knote *kn;
- struct proc *p;
+pshm_kqfilter(__unused struct fileproc *fp, __unused struct knote *kn,
+ __unused vfs_context_t ctx)
+{
+ return(ENOTSUP);
+}
+
+int
+fill_pshminfo(struct pshmnode * pshm, struct pshm_info * info)
+{
+ struct pshminfo *pinfo;
+ struct vinfo_stat *sb;
+
+ PSHM_SUBSYS_LOCK();
+ if ((pinfo = pshm->pinfo) == PSHMINFO_NULL){
+ PSHM_SUBSYS_UNLOCK();
+ return(EINVAL);
+ }
+
+ sb = &info->pshm_stat;
+
+ bzero(sb, sizeof(struct vinfo_stat));
+ sb->vst_mode = pinfo->pshm_mode;
+ sb->vst_uid = pinfo->pshm_uid;
+ sb->vst_gid = pinfo->pshm_gid;
+ sb->vst_size = pinfo->pshm_length;
+
+ info->pshm_mappaddr = pshm->mapp_addr;
+ bcopy(&pinfo->pshm_name[0], &info->pshm_name[0], PSHMNAMLEN+1);
+
+ PSHM_SUBSYS_UNLOCK();
+ return(0);
+}
+
+#if CONFIG_MACF
+void
+pshm_label_associate(struct fileproc *fp, struct vnode *vp, vfs_context_t ctx)
{
- return(EOPNOTSUPP);
+ struct pshmnode *pnode;
+ struct pshminfo *pshm;
+
+ PSHM_SUBSYS_LOCK();
+ pnode = (struct pshmnode *)fp->f_fglob->fg_data;
+ if (pnode != NULL) {
+ pshm = pnode->pinfo;
+ if (pshm != NULL)
+ mac_posixshm_vnode_label_associate(
+ vfs_context_ucred(ctx), pshm, pshm->pshm_label,
+ vp, vp->v_label);
+ }
+ PSHM_SUBSYS_UNLOCK();
}
+#endif
projects / apple / xnu.git / blobdiff