xnu-1504.9.17.tar.gz

[apple/xnu.git] / bsd / kern / posix_sem.c

diff --git a/bsd/kern/posix_sem.c b/bsd/kern/posix_sem.c
index 383fc0910afb9a0a7f782eec89201a7391ce611a..a2cd627f1c6fd0114179f3f8270ce0b4f661274f 100644 (file)
--- a/bsd/kern/posix_sem.c
+++ b/bsd/kern/posix_sem.c
@@ -1,31 +1,29 @@
 /*
 /*

- * Copyright (c) 2006 Apple Computer, Inc. All Rights Reserved.
+ * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@

  * 
  * 

- * @APPLE_LICENSE_OSREFERENCE_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.

  * 
  * 

- * 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, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
- * Please see the License for the specific language governing rights and 
+ * 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, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and

  * limitations under the License.
  * limitations under the License.

- *
- * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
+ * 
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@

  */
 /*
  *     Copyright (c) 1990, 1996-1998 Apple Computer, Inc.
  */
 /*
  *     Copyright (c) 1990, 1996-1998 Apple Computer, Inc.


@@ -42,6 +40,12 @@
  *     Created for MacOSX
  *
  */
  *     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/cdefs.h>
 #include <sys/param.h>


@@ -60,8 +64,14 @@
 #include <sys/malloc.h>
 #include <sys/semaphore.h>
 #include <sys/sysproto.h>
 #include <sys/malloc.h>
 #include <sys/semaphore.h>
 #include <sys/sysproto.h>

+#include <sys/proc_info.h>

 
 

-#include <bsm/audit_kernel.h>
+#if CONFIG_MACF
+#include <sys/vnode_internal.h>
+#include <security/mac_framework.h>
+#endif
+
+#include <security/audit/audit.h>

 
 #include <mach/mach_types.h>
 #include <mach/vm_prot.h>
 
 #include <mach/mach_types.h>
 #include <mach/vm_prot.h>


@@ -73,9 +83,6 @@
 #include <kern/clock.h>
 #include <mach/kern_return.h>
 
 #include <kern/clock.h>
 #include <mach/kern_return.h>
 

-#if KTRACE
-#include <sys/ktrace.h>
-#endif

 
 #define f_flag f_fglob->fg_flag
 #define f_type f_fglob->fg_type
 
 #define f_flag f_fglob->fg_flag
 #define f_type f_fglob->fg_type


@@ -94,7 +101,8 @@ struct pseminfo {
        gid_t           psem_gid;
        char            psem_name[PSEMNAMLEN + 1];      /* segment name */
        semaphore_t     psem_semobject;
        gid_t           psem_gid;
        char            psem_name[PSEMNAMLEN + 1];      /* segment name */
        semaphore_t     psem_semobject;

-       struct proc *   sem_proc;
+       proc_t          sem_proc;
+       struct label *  psem_label;

 };
 #define PSEMINFO_NULL (struct pseminfo *)0
 
 };
 #define PSEMINFO_NULL (struct pseminfo *)0
 


@@ -127,7 +135,7 @@ struct      psemstats {
 struct psemname {
        char    *psem_nameptr;  /* pointer to looked up name */
        long    psem_namelen;   /* length of looked up component */
 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 {
 };
 
 struct psemnode {


@@ -147,9 +155,9 @@ 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 */
 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,  0, "Posix");
-SYSCTL_NODE(_kern_posix, OID_AUTO, sem, CTLFLAG_RW, 0, "Semaphores");
-SYSCTL_INT (_kern_posix_sem, OID_AUTO, max, CTLFLAG_RW, &posix_sem_max, 0, "max");
+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, &posix_sem_max, "max");

 
 struct psemstats psemstats;            /* cache effectiveness statistics */
 
 
 struct psemstats psemstats;            /* cache effectiveness statistics */
 


@@ -159,18 +167,18 @@ static int psem_cache_search(struct pseminfo **,
 static int psem_delete(struct pseminfo * pinfo);
 
 static int psem_read (struct fileproc *fp, struct uio *uio,
 static int psem_delete(struct pseminfo * pinfo);
 
 static int psem_read (struct fileproc *fp, struct uio *uio,

-                           kauth_cred_t cred, int flags, struct proc *p);
+                           int flags, vfs_context_t ctx);

 static int psem_write (struct fileproc *fp, struct uio *uio,
 static int psem_write (struct fileproc *fp, struct uio *uio,

-                           kauth_cred_t cred, int flags, struct proc *p);
+                           int flags, vfs_context_t ctx);

 static int psem_ioctl (struct fileproc *fp, u_long com,
 static int psem_ioctl (struct fileproc *fp, u_long com,

-                           caddr_t data, struct proc *p);
-static int psem_select (struct fileproc *fp, int which, void *wql, struct proc *p);
-static int psem_closefile (struct fileglob *fp, struct proc *p);
+                           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 (struct fileproc *fp, struct knote *kn, struct proc *p);
+static int psem_kqfilter (struct fileproc *fp, struct knote *kn, vfs_context_t ctx);

 
 struct         fileops psemops =
 
 struct         fileops psemops =

-       { psem_read, psem_write, psem_ioctl, psem_select, psem_closefile, psem_kqfilter, 0 };
+       { 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_t       *psx_sem_subsys_lck_grp;


@@ -189,12 +197,10 @@ psem_lock_init( void )
 {
 
     psx_sem_subsys_lck_grp_attr = lck_grp_attr_alloc_init();
 {
 
     psx_sem_subsys_lck_grp_attr = lck_grp_attr_alloc_init();

-    lck_grp_attr_setstat(psx_sem_subsys_lck_grp_attr);

 
     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();
 
     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_attr_setdebug(psx_sem_subsys_lck_attr); */

     lck_mtx_init(& psx_sem_subsys_mutex, psx_sem_subsys_lck_grp, psx_sem_subsys_lck_attr);
 }
 
     lck_mtx_init(& psx_sem_subsys_mutex, psx_sem_subsys_lck_grp, psx_sem_subsys_lck_attr);
 }
 


@@ -209,10 +215,8 @@ psem_lock_init( void )
  */
 
 static int
  */
 
 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)

 {
        struct psemcache *pcp, *nnp;
        struct psemhashhead *pcpp;
 {
        struct psemcache *pcp, *nnp;
        struct psemhashhead *pcpp;


@@ -263,7 +267,7 @@ psem_cache_add(struct pseminfo *psemp, struct psemname *pnp, struct psemcache *p
        struct psemcache *dpcp;
 
 #if DIAGNOSTIC
        struct psemcache *dpcp;
 
 #if DIAGNOSTIC

-       if (pnp->psem_namelen > NCHNAMLEN)
+       if (pnp->psem_namelen > PSEMNAMLEN)

                panic("cache_enter: name too long");
 #endif
 
                panic("cache_enter: name too long");
 #endif
 


@@ -304,7 +308,7 @@ psem_cache_add(struct pseminfo *psemp, struct psemname *pnp, struct psemcache *p
 void
 psem_cache_init(void)
 {
 void
 psem_cache_init(void)
 {

-       psemhashtbl = hashinit(desiredvnodes, M_SHM, &psemhash);
+       psemhashtbl = hashinit(posix_sem_max / 2, M_SHM, &psemhash);

 }
 
 static void
 }
 
 static void


@@ -317,7 +321,7 @@ psem_cache_delete(struct psemcache *pcp)
                panic("namecache purge le_next");
 #endif /* DIAGNOSTIC */
        LIST_REMOVE(pcp, psem_hash);
                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--;
 }
 
        psemnument--;
 }
 


@@ -344,16 +348,17 @@ psem_cache_purge(void)
 #endif /* NOT_USED */
 
 int
 #endif /* NOT_USED */
 
 int

-sem_open(struct proc *p, struct sem_open_args *uap, user_addr_t *retval)
+sem_open(proc_t p, struct sem_open_args *uap, user_addr_t *retval)

 {
 {

-       struct fileproc *fp;

        size_t i;
        size_t i;

-       struct fileproc *nfp;

        int indx, error;
        struct psemname nd;
        struct pseminfo *pinfo;
        int indx, error;
        struct psemname nd;
        struct pseminfo *pinfo;

-       struct psemcache *pcp;
-       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;
        char * nameptr;
        char * cp;
        size_t pathlen, plen;


@@ -361,20 +366,24 @@ sem_open(struct proc *p, struct sem_open_args *uap, user_addr_t *retval)
        int cmode = uap->mode;
        int value = uap->value;
        int incache = 0;
        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(fflags, uap->oflag);
        AUDIT_ARG(mode, uap->mode);

-       AUDIT_ARG(value, uap->value);
+       AUDIT_ARG(value32, uap->value);

 
        pinfo = PSEMINFO_NULL;
 
 
        pinfo = PSEMINFO_NULL;
 

+       /*
+        * 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);
        MALLOC_ZONE(pnbuf, caddr_t, MAXPATHLEN, M_NAMEI, M_WAITOK);

-       if (pnbuf == NULL)
-               return(ENOSPC);
+       if (pnbuf == NULL) {
+               error = ENOSPC;
+               goto bad;
+       }

 
        pathlen = MAXPATHLEN;
        error = copyinstr(uap->name, pnbuf, MAXPATHLEN, &pathlen);
 
        pathlen = MAXPATHLEN;
        error = copyinstr(uap->name, pnbuf, MAXPATHLEN, &pathlen);


@@ -405,39 +414,92 @@ sem_open(struct proc *p, struct sem_open_args *uap, user_addr_t *retval)
        nameptr = pnbuf;
        nd.psem_nameptr = nameptr;
        nd.psem_namelen = plen;
        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;
        }
 
 
         for (cp = nameptr, i=1; *cp != 0 && i <= plen; i++, cp++) {
                nd.psem_hash += (unsigned char)*cp * i;
        }
 

-#if KTRACE
-       if (KTRPOINT(p, KTR_NAMEI))
-               ktrnamei(p->p_tracep, nameptr);
+       /*
+        * 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
 #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) {
        PSEM_SUBSYS_LOCK();
        error = psem_cache_search(&pinfo, &nd, &pcache);
 
        if (error == ENOENT) {

-               PSEM_SUBSYS_UNLOCK();

                error = EINVAL;
                error = EINVAL;

-               goto bad;
+               goto bad_locked;

 
        }
        if (!error) {
                incache = 0;
        } else
                incache = 1;
 
        }
        if (!error) {
                incache = 0;
        } else
                incache = 1;

-       fmode = FFLAGS(uap->oflag);

 
 

-       PSEM_SUBSYS_UNLOCK();
-       error = falloc(p, &nfp, &indx);
-       if (error)
-               goto bad;
-
-       PSEM_SUBSYS_LOCK();
-       fp = nfp;

        cmode &=  ALLPERMS;
 
        if (((fmode & (O_CREAT | O_EXCL))==(O_CREAT | O_EXCL)) &&  incache) {
        cmode &=  ALLPERMS;
 
        if (((fmode & (O_CREAT | O_EXCL))==(O_CREAT | O_EXCL)) &&  incache) {


@@ -448,9 +510,8 @@ sem_open(struct proc *p, struct sem_open_args *uap, user_addr_t *retval)
 #endif 
                AUDIT_ARG(posix_ipc_perm, pinfo->psem_uid,
                        pinfo->psem_gid, pinfo->psem_mode);
 #endif 
                AUDIT_ARG(posix_ipc_perm, pinfo->psem_uid,
                        pinfo->psem_gid, pinfo->psem_mode);

-               PSEM_SUBSYS_UNLOCK();

                error = EEXIST;
                error = EEXIST;

-               goto bad1;
+               goto bad_locked;

        }
        if (((fmode & (O_CREAT | O_EXCL))== O_CREAT) &&  incache) {
                /* As per POSIX, O_CREAT has no effect */
        }
        if (((fmode & (O_CREAT | O_EXCL))== O_CREAT) &&  incache) {
                /* As per POSIX, O_CREAT has no effect */


@@ -458,91 +519,84 @@ sem_open(struct proc *p, struct sem_open_args *uap, user_addr_t *retval)
        }
 
        if ( (fmode & O_CREAT) ) {
        }
 
        if ( (fmode & O_CREAT) ) {

-               if((value < 0) && (value > SEM_VALUE_MAX)) {
-                       PSEM_SUBSYS_UNLOCK();
-                       error = EINVAL;
-                       goto bad1;
-               }
-               PSEM_SUBSYS_UNLOCK();
-               MALLOC(pinfo, struct pseminfo *, sizeof(struct pseminfo), M_SHM, M_WAITOK|M_ZERO);
-               if (pinfo == NULL) {
-                       error = ENOSPC;
-                       goto bad1;
-               }
-               PSEM_SUBSYS_LOCK();
-
-               pinfo_alloc = 1;
+               /* 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 = kauth_cred_getuid(kauth_cred_get());
                pinfo->psem_gid = kauth_cred_get()->cr_gid;
                pinfo->psem_flags = PSEM_DEFINED | PSEM_INCREATE;
                pinfo->psem_usecount = 1;
                pinfo->psem_mode = cmode;
                pinfo->psem_uid = kauth_cred_getuid(kauth_cred_get());
                pinfo->psem_gid = kauth_cred_get()->cr_gid;

-               PSEM_SUBSYS_UNLOCK();
-               kret = semaphore_create(kernel_task, &pinfo->psem_semobject,
-                            SYNC_POLICY_FIFO, value);
-               if(kret != KERN_SUCCESS) 
-                       goto bad3;
-               PSEM_SUBSYS_LOCK();
+               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;
                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) {
        } else {
                /* semaphore should exist as it is without  O_CREAT */
                if (!incache) {

-                       PSEM_SUBSYS_UNLOCK();

                        error = ENOENT;
                        error = ENOENT;

-                       goto bad1;
+                       goto bad_locked;

                }
                if( pinfo->psem_flags & PSEM_INDELETE) {
                }
                if( pinfo->psem_flags & PSEM_INDELETE) {

-                       PSEM_SUBSYS_UNLOCK();

                        error = ENOENT;
                        error = ENOENT;

-                       goto bad1;
+                       goto bad_locked;

                }       
                AUDIT_ARG(posix_ipc_perm, pinfo->psem_uid,
                        pinfo->psem_gid, pinfo->psem_mode);
                }       
                AUDIT_ARG(posix_ipc_perm, pinfo->psem_uid,
                        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())) ) {
                if ( (error = psem_access(pinfo, fmode, kauth_cred_get())) ) {

-                       PSEM_SUBSYS_UNLOCK();
-                       goto bad1;
+                       goto bad_locked;

                }
        }
                }
        }

-       PSEM_SUBSYS_UNLOCK();
-       MALLOC(pnode, struct psemnode *, sizeof(struct psemnode), M_SHM, M_WAITOK|M_ZERO);
-       if (pnode == NULL) {
-               error = ENOSPC;
-               goto bad1;
-       }
-       if (!incache) {
-               /*
-               * 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 == NULL) {
-                       error = ENOMEM;
-                       goto bad2;
-               }

 
 

-       }
-       PSEM_SUBSYS_LOCK();

        if (!incache) {
        if (!incache) {

+               /* if successful, this will consume the pcp */

                if ( (error = psem_cache_add(pinfo, &nd, pcp)) ) {
                if ( (error = psem_cache_add(pinfo, &nd, pcp)) ) {

-                       PSEM_SUBSYS_UNLOCK();
-                       FREE(pcp, M_SHM);
-                       goto bad2;
+                       goto bad_locked;

                }
        }
        pinfo->psem_flags &= ~PSEM_INCREATE;
        pinfo->psem_usecount++;
                }
        }
        pinfo->psem_flags &= ~PSEM_INCREATE;
        pinfo->psem_usecount++;

-       pnode->pinfo = pinfo;
+       new_pnode->pinfo = pinfo;

        PSEM_SUBSYS_UNLOCK();
 
        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;
        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;
+       fp->f_data = (caddr_t)new_pnode;
+       procfdtbl_releasefd(p, indx, NULL);

        fp_drop(p, indx, fp, 1);
        proc_fdunlock(p);
 
        fp_drop(p, indx, fp, 1);
        proc_fdunlock(p);
 


@@ -550,24 +604,36 @@ sem_open(struct proc *p, struct sem_open_args *uap, user_addr_t *retval)
        FREE_ZONE(pnbuf, MAXPATHLEN, M_NAMEI);
        return (0);
 
        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);
-bad1:
-       if (pinfo_alloc)
-               FREE(pinfo, M_SHM);
-       fp_free(p, indx, nfp);
+bad_locked:
+       PSEM_SUBSYS_UNLOCK();

 bad:
 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);
 }
 
        return (error);
 }
 


@@ -613,7 +679,7 @@ psem_access(struct pseminfo *pinfo, int mode, kauth_cred_t cred)
 }
 
 int
 }
 
 int

-sem_unlink(__unused struct proc *p, struct sem_unlink_args *uap, __unused register_t *retval)
+sem_unlink(__unused proc_t p, struct sem_unlink_args *uap, __unused int32_t *retval)

 {
        size_t i;
        int error=0;
 {
        size_t i;
        int error=0;


@@ -683,6 +749,13 @@ sem_unlink(__unused struct proc *p, struct sem_unlink_args *uap, __unused regist
                goto bad;
        } else
                incache = 1;
                goto bad;
        } else
                incache = 1;

+#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 ( (error = psem_access(pinfo, pinfo->psem_mode, kauth_cred_get())) ) {
                PSEM_SUBSYS_UNLOCK();
                goto bad;


@@ -690,7 +763,8 @@ sem_unlink(__unused struct proc *p, struct sem_unlink_args *uap, __unused regist
 
        if ((pinfo->psem_flags & (PSEM_DEFINED | PSEM_ALLOCATED))==0) {
                PSEM_SUBSYS_UNLOCK();
 
        if ((pinfo->psem_flags & (PSEM_DEFINED | PSEM_ALLOCATED))==0) {
                PSEM_SUBSYS_UNLOCK();

-               return (EINVAL);
+               error = EINVAL;
+               goto bad;

        }
 
        if ( (pinfo->psem_flags & PSEM_INDELETE) ) {
        }
 
        if ( (pinfo->psem_flags & PSEM_INDELETE) ) {


@@ -721,9 +795,9 @@ bad:
 }
 
 int
 }
 
 int

-sem_close(struct proc *p, struct sem_close_args *uap, __unused register_t *retval)
+sem_close(proc_t p, struct sem_close_args *uap, __unused int32_t *retval)

 {
 {

-       int fd = CAST_DOWN(int,uap->sem);
+       int fd = CAST_DOWN_EXPLICIT(int,uap->sem);

        struct fileproc *fp;
        int error = 0;
 
        struct fileproc *fp;
        int error = 0;
 


@@ -735,6 +809,7 @@ sem_close(struct proc *p, struct sem_close_args *uap, __unused register_t *retva
                proc_fdunlock(p);
                return(error);
        }
                proc_fdunlock(p);
                return(error);
        }

+       fileproc_drain(p, fp);

        fdrelse(p, fd);
        error = closef_locked(fp, fp->f_fglob, p);
        FREE_ZONE(fp, sizeof *fp, M_FILEPROC);
        fdrelse(p, fd);
        error = closef_locked(fp, fp->f_fglob, p);
        FREE_ZONE(fp, sizeof *fp, M_FILEPROC);


@@ -743,9 +818,16 @@ sem_close(struct proc *p, struct sem_close_args *uap, __unused register_t *retva
 }
 
 int
 }
 
 int

-sem_wait(struct proc *p, struct sem_wait_args *uap, __unused register_t *retval)
+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_nocancel(proc_t p, struct sem_wait_nocancel_args *uap, __unused int32_t *retval)

 {
 {

-       int fd = CAST_DOWN(int,uap->sem);
+       int fd = CAST_DOWN_EXPLICIT(int,uap->sem);

        struct fileproc *fp;
        struct pseminfo * pinfo;
        struct psemnode * pnode ;
        struct fileproc *fp;
        struct pseminfo * pinfo;
        struct psemnode * pnode ;


@@ -771,7 +853,13 @@ sem_wait(struct proc *p, struct sem_wait_args *uap, __unused register_t *retval)
                error = EINVAL;
                goto out;
        }
                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) {
        PSEM_SUBSYS_UNLOCK();
        kret = semaphore_wait(pinfo->psem_semobject);
        switch (kret) {


@@ -797,9 +885,9 @@ out:
 }
 
 int
 }
 
 int

-sem_trywait(struct proc *p, struct sem_trywait_args *uap, __unused register_t *retval)
+sem_trywait(proc_t p, struct sem_trywait_args *uap, __unused int32_t *retval)

 {
 {

-       int fd = CAST_DOWN(int,uap->sem);
+       int fd = CAST_DOWN_EXPLICIT(int,uap->sem);

        struct fileproc *fp;
        struct pseminfo * pinfo;
        struct psemnode * pnode ;
        struct fileproc *fp;
        struct pseminfo * pinfo;
        struct psemnode * pnode ;


@@ -826,7 +914,13 @@ sem_trywait(struct proc *p, struct sem_trywait_args *uap, __unused register_t *r
                error = EINVAL;
                goto out;
        }
                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;
        PSEM_SUBSYS_UNLOCK();
        wait_time.tv_sec = 0;
        wait_time.tv_nsec = 0;


@@ -856,9 +950,9 @@ out:
 }
 
 int
 }
 
 int

-sem_post(struct proc *p, struct sem_post_args *uap, __unused register_t *retval)
+sem_post(proc_t p, struct sem_post_args *uap, __unused int32_t *retval)

 {
 {

-       int fd = CAST_DOWN(int,uap->sem);
+       int fd = CAST_DOWN_EXPLICIT(int,uap->sem);

        struct fileproc *fp;
        struct pseminfo * pinfo;
        struct psemnode * pnode ;
        struct fileproc *fp;
        struct pseminfo * pinfo;
        struct psemnode * pnode ;


@@ -884,7 +978,13 @@ sem_post(struct proc *p, struct sem_post_args *uap, __unused register_t *retval)
                error = EINVAL;
                goto out;
        }
                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) {
        PSEM_SUBSYS_UNLOCK();
        kret = semaphore_signal(pinfo->psem_semobject);
        switch (kret) {


@@ -909,29 +1009,28 @@ out:
 }
 
 int
 }
 
 int

-sem_init(__unused struct proc *p, __unused struct sem_init_args *uap, __unused register_t *retval)
+sem_init(__unused proc_t p, __unused struct sem_init_args *uap, __unused int32_t *retval)

 {
        return(ENOSYS);
 }
 
 int
 {
        return(ENOSYS);
 }
 
 int

-sem_destroy(__unused struct proc *p, __unused struct sem_destroy_args *uap, __unused register_t *retval)
+sem_destroy(__unused proc_t p, __unused struct sem_destroy_args *uap, __unused int32_t *retval)

 {
        return(ENOSYS);
 }
 
 int
 {
        return(ENOSYS);
 }
 
 int

-sem_getvalue(__unused struct proc *p, __unused struct sem_getvalue_args *uap, __unused register_t *retval)
+sem_getvalue(__unused proc_t p, __unused struct sem_getvalue_args *uap, __unused int32_t *retval)

 {
        return(ENOSYS);
 }
 
 static int
 {
        return(ENOSYS);
 }
 
 static int

-psem_close(struct psemnode *pnode, __unused int flags, 
-               __unused kauth_cred_t cred, __unused struct proc *p)
+psem_close(struct psemnode *pnode, __unused int flags)

 {
        int error=0;
 {
        int error=0;

-       register struct pseminfo *pinfo;
+       struct pseminfo *pinfo;

 
        PSEM_SUBSYS_LOCK();
        if ((pinfo = pnode->pinfo) == PSEMINFO_NULL){
 
        PSEM_SUBSYS_LOCK();
        if ((pinfo = pnode->pinfo) == PSEMINFO_NULL){


@@ -964,15 +1063,15 @@ psem_close(struct psemnode *pnode, __unused int flags,
 }
 
 static int
 }
 
 static int

-psem_closefile(fg, p)
-       struct fileglob *fg;
-       struct proc *p;
+psem_closefile(struct fileglob *fg, __unused vfs_context_t ctx)

 {
        int error;
 
 {
        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,
-               fg->fg_cred, p);
+       /*
+        * 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(error);
 }
 
        return(error);
 }


@@ -983,6 +1082,9 @@ psem_delete(struct pseminfo * pinfo)
        kern_return_t kret;
 
        kret = semaphore_destroy(kernel_task, pinfo->psem_semobject);
        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:
 
        switch (kret) {
        case KERN_INVALID_ADDRESS:


@@ -1000,38 +1102,88 @@ psem_delete(struct pseminfo * pinfo)
 
 static int
 psem_read(__unused struct fileproc *fp, __unused struct uio *uio, 
 
 static int
 psem_read(__unused struct fileproc *fp, __unused struct uio *uio, 

-                 __unused kauth_cred_t cred, __unused int flags, 
-                 __unused struct proc *p)
+                 __unused int flags, __unused vfs_context_t ctx)

 {
        return(ENOTSUP);
 }
 
 static int
 psem_write(__unused struct fileproc *fp, __unused struct uio *uio, 
 {
        return(ENOTSUP);
 }
 
 static int
 psem_write(__unused struct fileproc *fp, __unused struct uio *uio, 

-                  __unused kauth_cred_t cred, __unused int flags, 
-                  __unused struct proc *p)
+                  __unused int flags, __unused vfs_context_t ctx)

 {
        return(ENOTSUP);
 }
 
 static int
 psem_ioctl(__unused struct fileproc *fp, __unused u_long com, 
 {
        return(ENOTSUP);
 }
 
 static int
 psem_ioctl(__unused struct fileproc *fp, __unused u_long com, 

-                       __unused caddr_t data, __unused struct proc *p)
+                       __unused caddr_t data, __unused vfs_context_t ctx)

 {
        return(ENOTSUP);
 }
 
 static int
 psem_select(__unused struct fileproc *fp, __unused int which, 
 {
        return(ENOTSUP);
 }
 
 static int
 psem_select(__unused struct fileproc *fp, __unused int which, 

-                       __unused void *wql, __unused struct proc *p)
+                       __unused void *wql, __unused vfs_context_t ctx)

 {
        return(ENOTSUP);
 }
 
 static int
 psem_kqfilter(__unused struct fileproc *fp, __unused struct knote *kn, 
 {
        return(ENOTSUP);
 }
 
 static int
 psem_kqfilter(__unused struct fileproc *fp, __unused struct knote *kn, 

-                               __unused struct proc *p)
+                               __unused vfs_context_t ctx)

 {
        return (ENOTSUP);
 }
 
 {
        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
+