/*
- * 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.
* All Rights Reserved.
*/
/*
- * posix_shm.c : Support for POSIX semaphore APIs
+ * posix_sem.c : Support for POSIX semaphore APIs
*
* File: posix_sem.c
* Author: Ananthakrishna Ramesh
* 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/tty.h>
#include <sys/malloc.h>
#include <sys/semaphore.h>
+#include <sys/sysproto.h>
+#include <sys/proc_info.h>
+
+#if CONFIG_MACF
+#include <sys/vnode_internal.h>
+#include <security/mac_framework.h>
+#endif
-#include <bsm/audit_kernel.h>
+#include <security/audit/audit.h>
#include <mach/mach_types.h>
#include <mach/vm_prot.h>
#include <mach/semaphore.h>
#include <mach/sync_policy.h>
+#include <mach/task.h>
+#include <kern/kern_types.h>
#include <kern/task.h>
#include <kern/clock.h>
#include <mach/kern_return.h>
+
+#define f_flag f_fglob->fg_flag
+#define f_type f_fglob->fg_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 PSEMNAMLEN 31 /* maximum name segment length we bother with */
struct pseminfo {
uid_t psem_uid;
gid_t psem_gid;
char psem_name[PSEMNAMLEN + 1]; /* segment name */
- void * psem_semobject;
- struct proc * sem_proc;
+ semaphore_t psem_semobject;
+ proc_t sem_proc;
+ struct label * psem_label;
};
#define PSEMINFO_NULL (struct pseminfo *)0
struct psemname {
char *psem_nameptr; /* pointer to looked up name */
long psem_namelen; /* length of looked up component */
- u_long psem_hash; /* hash value of looked up name */
+ u_int32_t psem_hash; /* hash value of looked up name */
};
struct psemnode {
LIST_HEAD(psemhashhead, psemcache) *psemhashtbl; /* Hash Table */
u_long psemhash; /* size of hash table - 1 */
long psemnument; /* number of cache entries allocated */
+long posix_sem_max = 10000; /* tunable for max POSIX semaphores */
+ /* 10000 limits to ~1M of memory */
+SYSCTL_NODE(_kern, KERN_POSIX, posix, CTLFLAG_RW | CTLFLAG_LOCKED, 0, "Posix");
+SYSCTL_NODE(_kern_posix, OID_AUTO, sem, CTLFLAG_RW | CTLFLAG_LOCKED, 0, "Semaphores");
+SYSCTL_LONG (_kern_posix_sem, OID_AUTO, max, CTLFLAG_RW | CTLFLAG_LOCKED, &posix_sem_max, "max");
+
struct psemstats psemstats; /* cache effectiveness statistics */
-static int psem_cache_search __P((struct pseminfo **,
- struct psemname *, struct psemcache **));
+static int psem_access(struct pseminfo *pinfo, int mode, kauth_cred_t cred);
+static int psem_cache_search(struct pseminfo **,
+ struct psemname *, struct psemcache **);
+static int psem_delete(struct pseminfo * pinfo);
-static int psem_read __P((struct file *fp, struct uio *uio,
- struct ucred *cred, int flags, struct proc *p));
-static int psem_write __P((struct file *fp, struct uio *uio,
- struct ucred *cred, int flags, struct proc *p));
-static int psem_ioctl __P((struct file *fp, u_long com,
- caddr_t data, struct proc *p));
-static int psem_select __P((struct file *fp, int which, void *wql,
- struct proc *p));
-static int psem_closefile __P((struct file *fp, struct proc *p));
+static int psem_read (struct fileproc *fp, struct uio *uio,
+ int flags, vfs_context_t ctx);
+static int psem_write (struct fileproc *fp, struct uio *uio,
+ int flags, vfs_context_t ctx);
+static int psem_ioctl (struct fileproc *fp, u_long com,
+ caddr_t data, vfs_context_t ctx);
+static int psem_select (struct fileproc *fp, int which, void *wql, vfs_context_t ctx);
+static int psem_closefile (struct fileglob *fp, vfs_context_t ctx);
-static int psem_kqfilter __P((struct file *fp, struct knote *kn, struct proc *p));
+static int psem_kqfilter (struct fileproc *fp, struct knote *kn, vfs_context_t ctx);
struct fileops psemops =
- { psem_read, psem_write, psem_ioctl, psem_select, psem_closefile, psem_kqfilter };
+ { psem_read, psem_write, psem_ioctl, psem_select, psem_closefile, psem_kqfilter, NULL };
+
+
+static lck_grp_t *psx_sem_subsys_lck_grp;
+static lck_grp_attr_t *psx_sem_subsys_lck_grp_attr;
+static lck_attr_t *psx_sem_subsys_lck_attr;
+static lck_mtx_t psx_sem_subsys_mutex;
+
+#define PSEM_SUBSYS_LOCK() lck_mtx_lock(& psx_sem_subsys_mutex)
+#define PSEM_SUBSYS_UNLOCK() lck_mtx_unlock(& psx_sem_subsys_mutex)
+
+
+static int psem_cache_add(struct pseminfo *psemp, struct psemname *pnp, struct psemcache *pcp);
+/* Initialize the mutex governing access to the posix sem subsystem */
+__private_extern__ void
+psem_lock_init( void )
+{
+
+ psx_sem_subsys_lck_grp_attr = lck_grp_attr_alloc_init();
+
+ psx_sem_subsys_lck_grp = lck_grp_alloc_init("posix shared memory", psx_sem_subsys_lck_grp_attr);
+
+ psx_sem_subsys_lck_attr = lck_attr_alloc_init();
+ lck_mtx_init(& psx_sem_subsys_mutex, psx_sem_subsys_lck_grp, psx_sem_subsys_lck_attr);
+}
/*
* Lookup an entry in the cache
*/
static int
-psem_cache_search(psemp, pnp, pcache)
- struct pseminfo **psemp;
- struct psemname *pnp;
- struct psemcache **pcache;
+psem_cache_search(struct pseminfo **psemp, struct psemname *pnp,
+ struct psemcache **pcache)
{
- register struct psemcache *pcp, *nnp;
- register struct psemhashhead *pcpp;
+ struct psemcache *pcp, *nnp;
+ struct psemhashhead *pcpp;
if (pnp->psem_namelen > PSEMNAMLEN) {
psemstats.longnames++;
* Add an entry to the cache.
*/
static int
-psem_cache_add(psemp, pnp)
- struct pseminfo *psemp;
- struct psemname *pnp;
+psem_cache_add(struct pseminfo *psemp, struct psemname *pnp, struct psemcache *pcp)
{
- register struct psemcache *pcp;
- register struct psemhashhead *pcpp;
+ struct psemhashhead *pcpp;
struct pseminfo *dpinfo;
struct psemcache *dpcp;
#if DIAGNOSTIC
- if (pnp->psem_namelen > NCHNAMLEN)
+ if (pnp->psem_namelen > PSEMNAMLEN)
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 psemcache *)_MALLOC(sizeof(struct psemcache), M_SHM, M_WAITOK);
+
/* if the entry has already been added by some one else return */
if (psem_cache_search(&dpinfo, pnp, &dpcp) == -1) {
- _FREE(pcp, M_SHM);
return(EEXIST);
}
+ if (psemnument >= posix_sem_max)
+ return(ENOSPC);
psemnument++;
-
- bzero(pcp, sizeof(struct psemcache));
/*
* 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.
pcpp = PSEMHASH(pnp);
#if DIAGNOSTIC
{
- register struct psemcache *p;
+ struct psemcache *p;
for (p = pcpp->lh_first; p != 0; p = p->psem_hash.le_next)
if (p == pcp)
* Name cache initialization, from vfs_init() when we are booting
*/
void
-psem_cache_init()
+psem_cache_init(void)
{
- psemhashtbl = hashinit(desiredvnodes, M_SHM, &psemhash);
+ psemhashtbl = hashinit(posix_sem_max / 2, M_SHM, &psemhash);
}
static void
-psem_cache_delete(pcp)
- struct psemcache *pcp;
+psem_cache_delete(struct psemcache *pcp)
{
#if DIAGNOSTIC
if (pcp->psem_hash.le_prev == 0)
panic("namecache purge le_next");
#endif /* DIAGNOSTIC */
LIST_REMOVE(pcp, psem_hash);
- pcp->psem_hash.le_prev = 0;
+ pcp->psem_hash.le_prev = NULL;
psemnument--;
}
+#if NOT_USED
/*
* Invalidate a all entries to particular vnode.
*
* need to ditch the entire cache, to avoid confusion. No valid vnode will
* ever have (v_id == 0).
*/
-void
+static void
psem_cache_purge(void)
{
struct psemcache *pcp;
struct psemhashhead *pcpp;
for (pcpp = &psemhashtbl[psemhash]; pcpp >= psemhashtbl; pcpp--) {
- while (pcp = pcpp->lh_first)
+ while ( (pcp = pcpp->lh_first) )
psem_cache_delete(pcp);
}
}
-
-struct sem_open_args {
- const char *name;
- int oflag;
- int mode;
- int value;
-};
+#endif /* NOT_USED */
int
-sem_open(p, uap, retval)
- struct proc *p;
- register struct sem_open_args *uap;
- register_t *retval;
+sem_open(proc_t p, struct sem_open_args *uap, user_addr_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 psemname nd;
struct pseminfo *pinfo;
- extern struct fileops psemops;
- char * pnbuf;
+ struct fileproc *fp = NULL;
+ char *pnbuf = NULL;
+ struct pseminfo *new_pinfo = PSEMINFO_NULL;
+ struct psemnode *new_pnode = PSEMNODE_NULL;
+ struct psemcache *pcache = PSEMCACHE_NULL;
char * nameptr;
char * cp;
size_t pathlen, plen;
int cmode = uap->mode;
int value = uap->value;
int incache = 0;
- struct psemnode * pnode = PSEMNODE_NULL;
- struct psemcache * pcache = PSEMCACHE_NULL;
- kern_return_t kret = KERN_SUCCESS;
- int pinfo_alloc = 0;
-
+ struct psemcache *pcp = PSEMCACHE_NULL;
+ kern_return_t kret = KERN_INVALID_ADDRESS; /* default fail */
+
AUDIT_ARG(fflags, uap->oflag);
AUDIT_ARG(mode, uap->mode);
- AUDIT_ARG(value, uap->value);
+ AUDIT_ARG(value32, uap->value);
+
pinfo = PSEMINFO_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, pnbuf,
- MAXPATHLEN, &pathlen);
+ error = copyinstr(uap->name, pnbuf, MAXPATHLEN, &pathlen);
if (error) {
goto bad;
}
AUDIT_ARG(text, pnbuf);
- if (pathlen > PSEMNAMLEN) {
+ if ( (pathlen > PSEMNAMLEN) ) {
error = ENAMETOOLONG;
goto bad;
}
nameptr = pnbuf;
nd.psem_nameptr = nameptr;
nd.psem_namelen = plen;
- nd. psem_hash =0;
+ nd.psem_hash = 0;
for (cp = nameptr, i=1; *cp != 0 && i <= plen; i++, cp++) {
nd.psem_hash += (unsigned char)*cp * i;
}
+ /*
+ * 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;
+
+ /*
+ * 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 psemcache *, sizeof(struct psemcache), M_SHM, M_WAITOK|M_ZERO);
+ if (pcp == PSEMCACHE_NULL) {
+ error = ENOMEM;
+ goto bad;
+ }
+
+ MALLOC(new_pinfo, struct pseminfo *, sizeof(struct pseminfo), M_SHM, M_WAITOK|M_ZERO);
+ if (new_pinfo == NULL) {
+ error = ENOSPC;
+ goto bad;
+ }
+#if CONFIG_MACF
+ mac_posixsem_label_init(new_pinfo);
+#endif
+
+ /*
+ * Provisionally create the semaphore in the new_pinfo; we have to do
+ * this here to prevent locking later. We use the value of kret to
+ * signal success or failure, which is why we set its default value
+ * to KERN_INVALID_ADDRESS, above.
+ */
+
+ fmode = FFLAGS(uap->oflag);
+
+ if((fmode & O_CREAT)) {
+
+ if((value < 0) || (value > SEM_VALUE_MAX)) {
+ error = EINVAL;
+ goto bad;
+ }
+
+ kret = semaphore_create(kernel_task, &new_pinfo->psem_semobject, SYNC_POLICY_FIFO, value);
+
+ if (kret != KERN_SUCCESS) {
+ switch (kret) {
+ case KERN_RESOURCE_SHORTAGE:
+ error = ENOMEM;
+ break;
+ case KERN_PROTECTION_FAILURE:
+ error = EACCES;
+ break;
+ default:
+ error = EINVAL;
+ }
+ goto bad;
+ }
+ }
+
+ MALLOC(new_pnode, struct psemnode *, sizeof(struct psemnode), M_SHM, M_WAITOK|M_ZERO);
+ if (new_pnode == NULL) {
+ error = ENOSPC;
+ goto bad;
+ }
+
+ PSEM_SUBSYS_LOCK();
error = psem_cache_search(&pinfo, &nd, &pcache);
if (error == ENOENT) {
error = EINVAL;
- goto bad;
+ goto bad_locked;
}
if (!error) {
incache = 0;
} else
incache = 1;
- fmode = FFLAGS(uap->oflag);
-
- if (error = falloc(p, &nfp, &indx)) {
- goto bad;
- }
- fp = nfp;
cmode &= ALLPERMS;
if (((fmode & (O_CREAT | O_EXCL))==(O_CREAT | O_EXCL)) && incache) {
}
#endif
AUDIT_ARG(posix_ipc_perm, pinfo->psem_uid,
- pinfo->psem_gid, pinfo->psem_mode);
+ pinfo->psem_gid, pinfo->psem_mode);
error = EEXIST;
- goto bad1;
+ goto bad_locked;
}
if (((fmode & (O_CREAT | O_EXCL))== O_CREAT) && incache) {
/* As per POSIX, O_CREAT has no effect */
fmode &= ~O_CREAT;
}
- if (fmode & O_CREAT) {
- if((value < 0) && (value > SEM_VALUE_MAX)) {
- error = EINVAL;
- goto bad1;
- }
- pinfo = (struct pseminfo *)_MALLOC(sizeof(struct pseminfo), M_SHM, M_WAITOK);
- bzero(pinfo, sizeof(struct pseminfo));
- pinfo_alloc = 1;
+ if ( (fmode & O_CREAT) ) {
+ /* create a new one (commit the allocation) */
+ pinfo = new_pinfo;
pinfo->psem_flags = PSEM_DEFINED | PSEM_INCREATE;
pinfo->psem_usecount = 1;
pinfo->psem_mode = cmode;
- pinfo->psem_uid = p->p_ucred->cr_uid;
- pinfo->psem_gid = p->p_ucred->cr_gid;
- kret = semaphore_create(kernel_task, &pinfo->psem_semobject,
- SYNC_POLICY_FIFO, value);
- if(kret != KERN_SUCCESS)
- goto bad3;
+ pinfo->psem_uid = kauth_getuid();
+ pinfo->psem_gid = kauth_getgid();
+ bcopy(pnbuf, &pinfo->psem_name[0], PSEMNAMLEN);
+ pinfo->psem_name[PSEMNAMLEN]= 0;
pinfo->psem_flags &= ~PSEM_DEFINED;
pinfo->psem_flags |= PSEM_ALLOCATED;
pinfo->sem_proc = p;
+
+#if CONFIG_MACF
+ error = mac_posixsem_check_create(kauth_cred_get(), nameptr);
+ if (error) {
+ goto bad_locked;
+ }
+ mac_posixsem_label_associate(kauth_cred_get(), pinfo, nameptr);
+#endif
} else {
/* semaphore should exist as it is without O_CREAT */
if (!incache) {
error = ENOENT;
- goto bad1;
+ goto bad_locked;
}
if( pinfo->psem_flags & PSEM_INDELETE) {
error = ENOENT;
- goto bad1;
+ goto bad_locked;
}
AUDIT_ARG(posix_ipc_perm, pinfo->psem_uid,
- pinfo->psem_gid, pinfo->psem_mode);
- if (error = psem_access(pinfo, fmode, p->p_ucred, p))
- goto bad1;
+ pinfo->psem_gid, pinfo->psem_mode);
+#if CONFIG_MACF
+ error = mac_posixsem_check_open(kauth_cred_get(), pinfo);
+ if (error) {
+ goto bad_locked;
+ }
+#endif
+ if ( (error = psem_access(pinfo, fmode, kauth_cred_get())) ) {
+ goto bad_locked;
+ }
}
- pnode = (struct psemnode *)_MALLOC(sizeof(struct psemnode), M_SHM, M_WAITOK);
- bzero(pnode, sizeof(struct psemnode));
if (!incache) {
- if (error = psem_cache_add(pinfo, &nd)) {
- goto bad2;
+ /* if successful, this will consume the pcp */
+ if ( (error = psem_cache_add(pinfo, &nd, pcp)) ) {
+ goto bad_locked;
}
}
pinfo->psem_flags &= ~PSEM_INCREATE;
pinfo->psem_usecount++;
- pnode->pinfo = pinfo;
+ new_pnode->pinfo = pinfo;
+ PSEM_SUBSYS_UNLOCK();
+
+ /*
+ * if incache, we did not use the new pcp or the new pcp or the
+ * new . and we must free them.
+ */
+ if (incache) {
+ FREE(pcp, M_SHM);
+ pcp = PSEMCACHE_NULL;
+ if (new_pinfo != PSEMINFO_NULL) {
+ /* return value ignored - we can't _not_ do this */
+ (void)semaphore_destroy(kernel_task, new_pinfo->psem_semobject);
+#if CONFIG_MACF
+ mac_posixsem_label_destroy(new_pinfo);
+#endif
+ FREE(new_pinfo, M_SHM);
+ new_pinfo = PSEMINFO_NULL;
+ }
+ }
+
+ proc_fdlock(p);
fp->f_flag = fmode & FMASK;
fp->f_type = DTYPE_PSXSEM;
fp->f_ops = &psemops;
- fp->f_data = (caddr_t)pnode;
- *fdflags(p, indx) &= ~UF_RESERVED;
- *retval = indx;
+ fp->f_data = (caddr_t)new_pnode;
+ procfdtbl_releasefd(p, indx, NULL);
+ fp_drop(p, indx, fp, 1);
+ proc_fdunlock(p);
+
+ *retval = CAST_USER_ADDR_T(indx);
FREE_ZONE(pnbuf, MAXPATHLEN, M_NAMEI);
return (0);
-bad3:
- switch (kret) {
- case KERN_RESOURCE_SHORTAGE:
- error = ENOMEM;
- case KERN_PROTECTION_FAILURE:
- error = EACCES;
- default:
- error = EINVAL;
- }
- goto bad1;
-bad2:
- _FREE(pnode, M_SHM);
- if (pinfo_alloc)
- _FREE(pinfo, M_SHM);
-bad1:
- fdrelse(p, indx);
- ffree(nfp);
+bad_locked:
+ PSEM_SUBSYS_UNLOCK();
bad:
- FREE_ZONE(pnbuf, MAXPATHLEN, M_NAMEI);
+ if (pcp != PSEMCACHE_NULL)
+ FREE(pcp, M_SHM);
+
+ if (new_pnode != PSEMNODE_NULL)
+ FREE(new_pnode, M_SHM);
+
+ if (fp != NULL)
+ fp_free(p, indx, fp);
+
+ if (new_pinfo != PSEMINFO_NULL) {
+ /*
+ * kret signals whether or not we successfully created a
+ * Mach semaphore for this semaphore; if so, we need to
+ * destroy it here.
+ */
+ if (kret == KERN_SUCCESS) {
+ /* return value ignored - we can't _not_ do this */
+ (void)semaphore_destroy(kernel_task, new_pinfo->psem_semobject);
+ }
+#if CONFIG_MACF
+ mac_posixsem_label_destroy(new_pinfo);
+#endif
+ FREE(new_pinfo, M_SHM);
+ }
+
+ if (pnbuf != NULL)
+ FREE_ZONE(pnbuf, MAXPATHLEN, M_NAMEI);
return (error);
}
-int
-psem_access(pinfo, mode, cred, p)
- struct pseminfo *pinfo;
- int mode;
- struct ucred *cred;
- struct proc *p;
+/*
+ * XXX This code is repeated in several places
+ */
+static int
+psem_access(struct pseminfo *pinfo, int mode, kauth_cred_t cred)
{
- 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->psem_uid) {
- if (mode & FREAD)
- mask |= S_IRUSR;
- if (mode & FWRITE)
- mask |= S_IWUSR;
- return ((pinfo->psem_mode & mask) == mask ? 0 : EACCES);
- }
-
- /* Otherwise, check the groups. */
- for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++)
- if (pinfo->psem_gid == *gp) {
- if (mode & FREAD)
- mask |= S_IRGRP;
- if (mode & FWRITE)
- mask |= S_IWGRP;
- return ((pinfo->psem_mode & mask) == mask ? 0 : EACCES);
- }
-
- /* Otherwise, check everyone else. */
- if (mode & FREAD)
- mask |= S_IROTH;
- if (mode & FWRITE)
- mask |= S_IWOTH;
- return ((pinfo->psem_mode & mask) == mask ? 0 : EACCES);
+ return(posix_cred_access(cred, pinfo->psem_uid, pinfo->psem_gid, pinfo->psem_mode, mode_req));
}
-struct sem_unlink_args {
- const char *name;
-};
-
int
-sem_unlink(p, uap, retval)
- struct proc *p;
- register struct sem_unlink_args *uap;
- register_t *retval;
+sem_unlink(__unused proc_t p, struct sem_unlink_args *uap, __unused int32_t *retval)
{
- register struct filedesc *fdp = p->p_fd;
- register struct file *fp;
- int flags, i;
+ size_t i;
int error=0;
struct psemname nd;
struct pseminfo *pinfo;
- extern struct fileops psemops;
char * pnbuf;
char * nameptr;
char * cp;
size_t pathlen, plen;
- int fmode, cmode ;
int incache = 0;
- struct psemnode * pnode = PSEMNODE_NULL;
struct psemcache *pcache = PSEMCACHE_NULL;
- kern_return_t kret;
pinfo = PSEMINFO_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, pnbuf,
- MAXPATHLEN, &pathlen);
+ error = copyinstr(uap->name, pnbuf, MAXPATHLEN, &pathlen);
if (error) {
goto bad;
}
nd.psem_hash += (unsigned char)*cp * i;
}
+ PSEM_SUBSYS_LOCK();
error = psem_cache_search(&pinfo, &nd, &pcache);
if (error == ENOENT) {
+ PSEM_SUBSYS_UNLOCK();
error = EINVAL;
goto bad;
}
if (!error) {
+ PSEM_SUBSYS_UNLOCK();
error = EINVAL;
goto bad;
} else
incache = 1;
- if (error = psem_access(pinfo, pinfo->psem_mode, p->p_ucred, p))
+#if CONFIG_MACF
+ error = mac_posixsem_check_unlink(kauth_cred_get(), pinfo, nameptr);
+ if (error) {
+ PSEM_SUBSYS_UNLOCK();
+ goto bad;
+ }
+#endif
+ if ( (error = psem_access(pinfo, pinfo->psem_mode, kauth_cred_get())) ) {
+ PSEM_SUBSYS_UNLOCK();
goto bad;
+ }
if ((pinfo->psem_flags & (PSEM_DEFINED | PSEM_ALLOCATED))==0) {
- return (EINVAL);
+ PSEM_SUBSYS_UNLOCK();
+ error = EINVAL;
+ goto bad;
}
- if (pinfo->psem_flags & PSEM_INDELETE) {
+ if ( (pinfo->psem_flags & PSEM_INDELETE) ) {
+ PSEM_SUBSYS_UNLOCK();
error = 0;
goto bad;
}
+
AUDIT_ARG(posix_ipc_perm, pinfo->psem_uid, pinfo->psem_gid,
pinfo->psem_mode);
if (!pinfo->psem_usecount) {
psem_delete(pinfo);
- _FREE(pinfo,M_SHM);
+ FREE(pinfo,M_SHM);
} else
pinfo->psem_flags |= PSEM_REMOVED;
psem_cache_delete(pcache);
- _FREE(pcache, M_SHM);
+ PSEM_SUBSYS_UNLOCK();
+ FREE(pcache, M_SHM);
error = 0;
bad:
FREE_ZONE(pnbuf, MAXPATHLEN, M_NAMEI);
return (error);
}
-struct sem_close_args {
- sem_t *sem;
-};
-
int
-sem_close(p, uap, retval)
- struct proc *p;
- struct sem_close_args *uap;
- register_t *retval;
+sem_close(proc_t p, struct sem_close_args *uap, __unused int32_t *retval)
{
- int fd = (int)uap->sem;
- register struct filedesc *fdp = p->p_fd;
- register struct file *fp;
+ int fd = CAST_DOWN_EXPLICIT(int,uap->sem);
+ struct fileproc *fp;
int error = 0;
AUDIT_ARG(fd, fd); /* XXX This seems wrong; uap->sem is a pointer */
- if ((u_int)fd >= fdp->fd_nfiles ||
- (fp = fdp->fd_ofiles[fd]) == NULL ||
- (fdp->fd_ofileflags[fd] & UF_RESERVED))
- return (EBADF);
- fdrelse(p, fd);
- if( error = closef(fp, p))
+
+ proc_fdlock(p);
+ error = fp_lookup(p,fd, &fp, 1);
+ if (error) {
+ proc_fdunlock(p);
return(error);
- return(0);
+ }
+ procfdtbl_markclosefd(p, fd);
+ fileproc_drain(p, fp);
+ fdrelse(p, fd);
+ error = closef_locked(fp, fp->f_fglob, p);
+ FREE_ZONE(fp, sizeof *fp, M_FILEPROC);
+ proc_fdunlock(p);
+ return(error);
}
-struct sem_wait_args {
- sem_t *sem;
-};
+int
+sem_wait(proc_t p, struct sem_wait_args *uap, int32_t *retval)
+{
+ __pthread_testcancel(1);
+ return(sem_wait_nocancel(p, (struct sem_wait_nocancel_args *)uap, retval));
+}
int
-sem_wait(p, uap, retval)
- struct proc *p;
- struct sem_wait_args *uap;
- register_t *retval;
+sem_wait_nocancel(proc_t p, struct sem_wait_nocancel_args *uap, __unused int32_t *retval)
{
- int fd = (int)uap->sem;
- register struct filedesc *fdp = p->p_fd;
- struct file *fp;
+ int fd = CAST_DOWN_EXPLICIT(int,uap->sem);
+ struct fileproc *fp;
struct pseminfo * pinfo;
struct psemnode * pnode ;
kern_return_t kret;
int error;
- if (error = fdgetf(p, (int)uap->sem, &fp))
+ error = fp_getfpsem(p, fd, &fp, &pnode);
+ if (error)
return (error);
- if (fp->f_type != DTYPE_PSXSEM)
- return(EBADF);
- if (((pnode = (struct psemnode *)fp->f_data)) == PSEMNODE_NULL )
- return(EINVAL);
- if ((pinfo = pnode->pinfo) == PSEMINFO_NULL)
- return(EINVAL);
+ if (((pnode = (struct psemnode *)fp->f_data)) == PSEMNODE_NULL ) {
+ error = EINVAL;
+ goto out;
+ }
+ PSEM_SUBSYS_LOCK();
+ if ((pinfo = pnode->pinfo) == PSEMINFO_NULL) {
+ PSEM_SUBSYS_UNLOCK();
+ error = EINVAL;
+ goto out;
+ }
if ((pinfo->psem_flags & (PSEM_DEFINED | PSEM_ALLOCATED))
!= PSEM_ALLOCATED) {
- return(EINVAL);
+ PSEM_SUBSYS_UNLOCK();
+ error = EINVAL;
+ goto out;
}
-
+#if CONFIG_MACF
+ error = mac_posixsem_check_wait(kauth_cred_get(), pinfo);
+ if (error) {
+ PSEM_SUBSYS_UNLOCK();
+ goto out;
+ }
+#endif
+ PSEM_SUBSYS_UNLOCK();
kret = semaphore_wait(pinfo->psem_semobject);
switch (kret) {
case KERN_INVALID_ADDRESS:
case KERN_PROTECTION_FAILURE:
- return (EACCES);
+ error = EACCES;
+ break;
case KERN_ABORTED:
case KERN_OPERATION_TIMED_OUT:
- return (EINTR);
+ error = EINTR;
+ break;
case KERN_SUCCESS:
- return(0);
+ error = 0;
+ break;
default:
- return (EINVAL);
+ error = EINVAL;
+ break;
}
-}
+out:
+ fp_drop(p, fd, fp, 0);
+ return(error);
-struct sem_trywait_args {
- sem_t *sem;
-};
+}
int
-sem_trywait(p, uap, retval)
- struct proc *p;
- struct sem_trywait_args *uap;
- register_t *retval;
+sem_trywait(proc_t p, struct sem_trywait_args *uap, __unused int32_t *retval)
{
- int fd = (int)uap->sem;
- register struct filedesc *fdp = p->p_fd;
- struct file *fp;
+ int fd = CAST_DOWN_EXPLICIT(int,uap->sem);
+ struct fileproc *fp;
struct pseminfo * pinfo;
struct psemnode * pnode ;
kern_return_t kret;
mach_timespec_t wait_time;
int error;
- if (error = fdgetf(p, (int)uap->sem, &fp))
+ error = fp_getfpsem(p, fd, &fp, &pnode);
+ if (error)
return (error);
- if (fp->f_type != DTYPE_PSXSEM)
- return(EBADF);
- if (((pnode = (struct psemnode *)fp->f_data)) == PSEMNODE_NULL )
- return(EINVAL);
- if ((pinfo = pnode->pinfo) == PSEMINFO_NULL)
- return(EINVAL);
+ if (((pnode = (struct psemnode *)fp->f_data)) == PSEMNODE_NULL ) {
+ error = EINVAL;
+ goto out;
+ }
+ PSEM_SUBSYS_LOCK();
+ if ((pinfo = pnode->pinfo) == PSEMINFO_NULL) {
+ PSEM_SUBSYS_UNLOCK();
+ error = EINVAL;
+ goto out;
+ }
if ((pinfo->psem_flags & (PSEM_DEFINED | PSEM_ALLOCATED))
!= PSEM_ALLOCATED) {
- return(EINVAL);
+ PSEM_SUBSYS_UNLOCK();
+ error = EINVAL;
+ goto out;
}
-
+#if CONFIG_MACF
+ error = mac_posixsem_check_wait(kauth_cred_get(), pinfo);
+ if (error) {
+ PSEM_SUBSYS_UNLOCK();
+ goto out;
+ }
+#endif
+ PSEM_SUBSYS_UNLOCK();
wait_time.tv_sec = 0;
wait_time.tv_nsec = 0;
switch (kret) {
case KERN_INVALID_ADDRESS:
case KERN_PROTECTION_FAILURE:
- return (EINVAL);
+ error = EINVAL;
+ break;
case KERN_ABORTED:
- return (EINTR);
+ error = EINTR;
+ break;
case KERN_OPERATION_TIMED_OUT:
- return (EAGAIN);
+ error = EAGAIN;
+ break;
case KERN_SUCCESS:
- return(0);
+ error = 0;
+ break;
default:
- return (EINVAL);
+ error = EINVAL;
+ break;
}
+out:
+ fp_drop(p, fd, fp, 0);
+ return(error);
}
-struct sem_post_args {
- sem_t *sem;
-};
-
int
-sem_post(p, uap, retval)
- struct proc *p;
- struct sem_post_args *uap;
- register_t *retval;
+sem_post(proc_t p, struct sem_post_args *uap, __unused int32_t *retval)
{
- int fd = (int)uap->sem;
- register struct filedesc *fdp = p->p_fd;
- struct file *fp;
+ int fd = CAST_DOWN_EXPLICIT(int,uap->sem);
+ struct fileproc *fp;
struct pseminfo * pinfo;
struct psemnode * pnode ;
kern_return_t kret;
int error;
- if (error = fdgetf(p, (int)uap->sem, &fp))
+ error = fp_getfpsem(p, fd, &fp, &pnode);
+ if (error)
return (error);
- if (fp->f_type != DTYPE_PSXSEM)
- return(EBADF);
- if (((pnode = (struct psemnode *)fp->f_data)) == PSEMNODE_NULL )
- return(EINVAL);
- if ((pinfo = pnode->pinfo) == PSEMINFO_NULL)
- return(EINVAL);
+ if (((pnode = (struct psemnode *)fp->f_data)) == PSEMNODE_NULL ) {
+ error = EINVAL;
+ goto out;
+ }
+ PSEM_SUBSYS_LOCK();
+ if ((pinfo = pnode->pinfo) == PSEMINFO_NULL) {
+ PSEM_SUBSYS_UNLOCK();
+ error = EINVAL;
+ goto out;
+ }
if ((pinfo->psem_flags & (PSEM_DEFINED | PSEM_ALLOCATED))
!= PSEM_ALLOCATED) {
- return(EINVAL);
+ PSEM_SUBSYS_UNLOCK();
+ error = EINVAL;
+ goto out;
}
-
+#if CONFIG_MACF
+ error = mac_posixsem_check_post(kauth_cred_get(), pinfo);
+ if (error) {
+ PSEM_SUBSYS_UNLOCK();
+ goto out;
+ }
+#endif
+ PSEM_SUBSYS_UNLOCK();
kret = semaphore_signal(pinfo->psem_semobject);
switch (kret) {
case KERN_INVALID_ADDRESS:
case KERN_PROTECTION_FAILURE:
- return (EINVAL);
+ error = EINVAL;
+ break;
case KERN_ABORTED:
case KERN_OPERATION_TIMED_OUT:
- return (EINTR);
+ error = EINTR;
+ break;
case KERN_SUCCESS:
- return(0);
+ error = 0;
+ break;
default:
- return (EINVAL);
+ error = EINVAL;
+ break;
}
+out:
+ fp_drop(p, fd, fp, 0);
+ return(error);
}
-struct sem_init_args {
- sem_t *sem;
- int phsared;
- unsigned int value;
-};
-
int
-sem_init(p, uap, retval)
- struct proc *p;
- struct sem_init_args *uap;
- register_t *retval;
+sem_init(__unused proc_t p, __unused struct sem_init_args *uap, __unused int32_t *retval)
{
return(ENOSYS);
}
-struct sem_destroy_args {
- sem_t *sem;
-};
-
int
-sem_destroy(p, uap, retval)
- struct proc *p;
- struct sem_destroy_args *uap;
- register_t *retval;
+sem_destroy(__unused proc_t p, __unused struct sem_destroy_args *uap, __unused int32_t *retval)
{
return(ENOSYS);
}
-struct sem_getvalue_args {
- sem_t *sem;
- int * sval;
-};
-
int
-sem_getvalue(p, uap, retval)
- struct proc *p;
- struct sem_getvalue_args *uap;
- register_t *retval;
+sem_getvalue(__unused proc_t p, __unused struct sem_getvalue_args *uap, __unused int32_t *retval)
{
return(ENOSYS);
}
static int
-psem_close(pnode, flags, cred, p)
- register struct psemnode *pnode;
- int flags;
- struct ucred *cred;
- struct proc *p;
+psem_close(struct psemnode *pnode, __unused int flags)
{
int error=0;
- kern_return_t kret;
- register struct pseminfo *pinfo;
+ struct pseminfo *pinfo;
- if ((pinfo = pnode->pinfo) == PSEMINFO_NULL)
+ PSEM_SUBSYS_LOCK();
+ if ((pinfo = pnode->pinfo) == PSEMINFO_NULL){
+ PSEM_SUBSYS_UNLOCK();
return(EINVAL);
+ }
if ((pinfo->psem_flags & PSEM_ALLOCATED) != PSEM_ALLOCATED) {
+ PSEM_SUBSYS_UNLOCK();
return(EINVAL);
}
#if DIAGNOSTIC
pinfo->psem_usecount--;
if ((pinfo->psem_flags & PSEM_REMOVED) && !pinfo->psem_usecount) {
+ PSEM_SUBSYS_UNLOCK();
+ /* lock dropped as only semaphore is destroyed here */
error = psem_delete(pinfo);
- _FREE(pinfo,M_SHM);
+ FREE(pinfo,M_SHM);
+ } else {
+ PSEM_SUBSYS_UNLOCK();
}
- _FREE(pnode, M_SHM);
+ /* subsystem lock is dropped when we get here */
+ FREE(pnode, M_SHM);
return (error);
}
static int
-psem_closefile(fp, p)
- struct file *fp;
- struct proc *p;
+psem_closefile(struct fileglob *fg, __unused vfs_context_t ctx)
{
+ int error;
+
+ /*
+ * Not locked as psem_close is called only from here and is locked
+ * properly
+ */
+ error = psem_close(((struct psemnode *)fg->fg_data), fg->fg_flag);
- return (psem_close(((struct psemnode *)fp->f_data), fp->f_flag,
- fp->f_cred, p));
+ return(error);
}
-int
+static int
psem_delete(struct pseminfo * pinfo)
{
kern_return_t kret;
kret = semaphore_destroy(kernel_task, pinfo->psem_semobject);
+#if CONFIG_MACF
+ mac_posixsem_label_destroy(pinfo);
+#endif
switch (kret) {
case KERN_INVALID_ADDRESS:
}
static int
-psem_read(fp, uio, cred, flags, p)
- struct file *fp;
- struct uio *uio;
- struct ucred *cred;
- int flags;
- struct proc *p;
+psem_read(__unused struct fileproc *fp, __unused struct uio *uio,
+ __unused int flags, __unused vfs_context_t ctx)
{
- return(EOPNOTSUPP);
+ return(ENOTSUP);
}
static int
-psem_write(fp, uio, cred, flags, p)
- struct file *fp;
- struct uio *uio;
- struct ucred *cred;
- int flags;
- struct proc *p;
+psem_write(__unused struct fileproc *fp, __unused struct uio *uio,
+ __unused int flags, __unused vfs_context_t ctx)
{
- return(EOPNOTSUPP);
+ return(ENOTSUP);
}
static int
-psem_ioctl(fp, com, data, p)
- struct file *fp;
- u_long com;
- caddr_t data;
- struct proc *p;
+psem_ioctl(__unused struct fileproc *fp, __unused u_long com,
+ __unused caddr_t data, __unused vfs_context_t ctx)
{
- return(EOPNOTSUPP);
+ return(ENOTSUP);
}
static int
-psem_select(fp, which, wql, p)
- struct file *fp;
- int which;
- void *wql;
- struct proc *p;
+psem_select(__unused struct fileproc *fp, __unused int which,
+ __unused void *wql, __unused vfs_context_t ctx)
{
- return(EOPNOTSUPP);
+ return(ENOTSUP);
}
static int
-psem_kqfilter(fp, kn, p)
- struct file *fp;
- struct knote *kn;
- struct proc *p;
+psem_kqfilter(__unused struct fileproc *fp, __unused struct knote *kn,
+ __unused vfs_context_t ctx)
{
- return (EOPNOTSUPP);
+ return (ENOTSUP);
}
+int
+fill_pseminfo(struct psemnode *pnode, struct psem_info * info)
+{
+ struct pseminfo *pinfo;
+ struct vinfo_stat *sb;
+
+ PSEM_SUBSYS_LOCK();
+ if ((pinfo = pnode->pinfo) == PSEMINFO_NULL){
+ PSEM_SUBSYS_UNLOCK();
+ return(EINVAL);
+ }
+
+#if 0
+ if ((pinfo->psem_flags & PSEM_ALLOCATED) != PSEM_ALLOCATED) {
+ PSEM_SUBSYS_UNLOCK();
+ return(EINVAL);
+ }
+#endif
+
+ sb = &info->psem_stat;
+ bzero(sb, sizeof(struct vinfo_stat));
+
+ sb->vst_mode = pinfo->psem_mode;
+ sb->vst_uid = pinfo->psem_uid;
+ sb->vst_gid = pinfo->psem_gid;
+ sb->vst_size = pinfo->psem_usecount;
+ bcopy(&pinfo->psem_name[0], &info->psem_name[0], PSEMNAMLEN+1);
+
+ PSEM_SUBSYS_UNLOCK();
+ return(0);
+}
+
+#if CONFIG_MACF
+void
+psem_label_associate(struct fileproc *fp, struct vnode *vp, vfs_context_t ctx)
+{
+ struct psemnode *pnode;
+ struct pseminfo *psem;
+
+ PSEM_SUBSYS_LOCK();
+ pnode = (struct psemnode *)fp->f_fglob->fg_data;
+ if (pnode != NULL) {
+ psem = pnode->pinfo;
+ if (psem != NULL)
+ mac_posixsem_vnode_label_associate(
+ vfs_context_ucred(ctx), psem, psem->psem_label,
+ vp, vp->v_label);
+ }
+ PSEM_SUBSYS_UNLOCK();
+}
+#endif
+
projects / apple / xnu.git / blobdiff