/*
- * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* 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/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 <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_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
gid_t psem_gid;
char psem_name[PSEMNAMLEN + 1]; /* segment name */
semaphore_t psem_semobject;
- struct proc * sem_proc;
+ struct label * psem_label;
+ pid_t psem_creator_pid;
+ uint64_t psem_creator_uniqueid;
};
#define PSEMINFO_NULL (struct pseminfo *)0
};
#define PSEMCACHE_NULL (struct psemcache *)0
+#define PSEMCACHE_NOTFOUND (0)
+#define PSEMCACHE_FOUND (-1)
+#define PSEMCACHE_NEGATIVE (ENOENT)
+
struct psemstats {
long goodhits; /* hits that we can really use */
long neghits; /* negative hits that we can use */
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 {
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 | CTLFLAG_LOCKED, &posix_sem_max, "max");
struct psemstats psemstats; /* cache effectiveness statistics */
static int psem_access(struct pseminfo *pinfo, int mode, kauth_cred_t cred);
static int psem_cache_search(struct pseminfo **,
- struct psemname *, struct psemcache **);
+ struct psemname *, struct psemcache **);
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,
- 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,
- 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);
-
-static int psem_kqfilter (struct fileproc *fp, struct knote *kn, struct proc *p);
-
-struct fileops psemops =
- { psem_read, psem_write, psem_ioctl, psem_select, psem_closefile, psem_kqfilter, 0 };
-
+ 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_unlink_internal(struct pseminfo *pinfo, struct psemcache *pcache);
+
+static int psem_kqfilter (struct fileproc *fp, struct knote *kn,
+ struct kevent_internal_s *kev, vfs_context_t ctx);
+
+static const struct fileops psemops = {
+ .fo_type = DTYPE_PSXSEM,
+ .fo_read = psem_read,
+ .fo_write = psem_write,
+ .fo_ioctl = psem_ioctl,
+ .fo_select = psem_select,
+ .fo_close = psem_closefile,
+ .fo_kqfilter = psem_kqfilter,
+ .fo_drain = NULL,
+};
static lck_grp_t *psx_sem_subsys_lck_grp;
static lck_grp_attr_t *psx_sem_subsys_lck_grp_attr;
#define PSEM_SUBSYS_LOCK() lck_mtx_lock(& psx_sem_subsys_mutex)
#define PSEM_SUBSYS_UNLOCK() lck_mtx_unlock(& psx_sem_subsys_mutex)
+#define PSEM_SUBSYS_ASSERT_HELD() LCK_MTX_ASSERT(&psx_sem_subsys_mutex, LCK_MTX_ASSERT_OWNED)
static int psem_cache_add(struct pseminfo *psemp, struct psemname *pnp, struct psemcache *pcp);
+static void psem_cache_delete(struct psemcache *pcp);
+int psem_cache_purge_all(proc_t);
+
+
/* 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();
- 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();
- /* 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);
}
*/
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;
if (pnp->psem_namelen > PSEMNAMLEN) {
psemstats.longnames++;
- return (0);
+ return PSEMCACHE_NOTFOUND;
}
pcpp = PSEMHASH(pnp);
if (pcp == 0) {
psemstats.miss++;
- return (0);
+ return PSEMCACHE_NOTFOUND;
}
/* We found a "positive" match, return the vnode */
/* TOUCH(ncp); */
*psemp = pcp->pseminfo;
*pcache = pcp;
- return (-1);
+ return PSEMCACHE_FOUND;
}
/*
* The nc_vpid field records whether this is a whiteout.
*/
psemstats.neghits++;
- return (ENOENT);
+ return PSEMCACHE_NEGATIVE;
}
/*
struct psemcache *dpcp;
#if DIAGNOSTIC
- if (pnp->psem_namelen > NCHNAMLEN)
+ if (pnp->psem_namelen > PSEMNAMLEN)
panic("cache_enter: name too long");
#endif
/* if the entry has already been added by some one else return */
- if (psem_cache_search(&dpinfo, pnp, &dpcp) == -1) {
- return(EEXIST);
+ if (psem_cache_search(&dpinfo, pnp, &dpcp) == PSEMCACHE_FOUND) {
+ return EEXIST;
}
if (psemnument >= posix_sem_max)
- return(ENOSPC);
+ return ENOSPC;
psemnument++;
/*
* Fill in cache info, if vp is NULL this is a "negative" cache entry.
}
#endif
LIST_INSERT_HEAD(pcpp, pcp, psem_hash);
- return(0);
+ return 0;
}
/*
void
psem_cache_init(void)
{
- psemhashtbl = hashinit(desiredvnodes, M_SHM, &psemhash);
+ psemhashtbl = hashinit(posix_sem_max / 2, M_SHM, &psemhash);
}
static void
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.
- *
- * 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).
+ * Remove all cached psem entries. Open semaphores (with a positive refcount)
+ * will continue to exist, but their cache entries tying them to a particular
+ * name/path will be removed making all future lookups on the name fail.
*/
-static void
-psem_cache_purge(void)
+int
+psem_cache_purge_all(__unused proc_t p)
{
- struct psemcache *pcp;
+ struct psemcache *pcp, *tmppcp;
struct psemhashhead *pcpp;
+ int error = 0;
+ if (kauth_cred_issuser(kauth_cred_get()) == 0)
+ return EPERM;
+
+ PSEM_SUBSYS_LOCK();
for (pcpp = &psemhashtbl[psemhash]; pcpp >= psemhashtbl; pcpp--) {
- while ( (pcp = pcpp->lh_first) )
- psem_cache_delete(pcp);
+ LIST_FOREACH_SAFE(pcp, pcpp, psem_hash, tmppcp) {
+ assert(pcp->psem_nlen);
+ /*
+ * unconditionally unlink the cache entry
+ */
+ error = psem_unlink_internal(pcp->pseminfo, pcp);
+ if (error)
+ goto out;
+ }
}
+ assert(psemnument == 0);
+
+out:
+ PSEM_SUBSYS_UNLOCK();
+
+ if (error)
+ printf("%s: Error %d removing all semaphores: %ld remain!\n",
+ __func__, error, psemnument);
+ return error;
}
-#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;
- struct fileproc *nfp;
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;
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);
- if (pnbuf == NULL)
- return(ENOSPC);
+ /*
+ * 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 | M_ZERO);
+ if (pnbuf == NULL) {
+ error = ENOSPC;
+ goto bad;
+ }
pathlen = MAXPATHLEN;
error = copyinstr(uap->name, pnbuf, MAXPATHLEN, &pathlen);
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;
}
-#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
+
+ /*
+ * 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_UNLOCK();
+ if (error == PSEMCACHE_NEGATIVE) {
error = EINVAL;
- goto bad;
-
+ goto bad_locked;
}
- if (!error) {
- incache = 0;
- } else
- incache = 1;
- fmode = FFLAGS(uap->oflag);
- PSEM_SUBSYS_UNLOCK();
- error = falloc(p, &nfp, &indx);
- if (error)
- goto bad;
+ if (error == PSEMCACHE_FOUND)
+ incache = 1;
+ else
+ incache = 0;
- PSEM_SUBSYS_LOCK();
- 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);
- PSEM_SUBSYS_UNLOCK();
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) ) {
- 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;
- PSEM_SUBSYS_UNLOCK();
- kret = semaphore_create(kernel_task, &pinfo->psem_semobject,
- SYNC_POLICY_FIFO, value);
- if(kret != KERN_SUCCESS)
- goto bad3;
- PSEM_SUBSYS_LOCK();
+ 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;
+ pinfo->psem_creator_pid = p->p_pid;
+ pinfo->psem_creator_uniqueid = p->p_uniqueid;
+
+#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) {
- PSEM_SUBSYS_UNLOCK();
error = ENOENT;
- goto bad1;
+ goto bad_locked;
}
if( pinfo->psem_flags & PSEM_INDELETE) {
- PSEM_SUBSYS_UNLOCK();
error = ENOENT;
- goto bad1;
+ goto bad_locked;
}
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())) ) {
- 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 successful, this will consume the 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++;
- 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;
+ fp->f_data = (caddr_t)new_pnode;
+ procfdtbl_releasefd(p, indx, NULL);
fp_drop(p, indx, fp, 1);
proc_fdunlock(p);
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:
- 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);
}
static int
psem_access(struct pseminfo *pinfo, int mode, kauth_cred_t cred)
{
- mode_t mask;
- int is_member;
+ int mode_req = ((mode & FREAD) ? S_IRUSR : 0) |
+ ((mode & FWRITE) ? S_IWUSR : 0);
/* Otherwise, user id 0 always gets access. */
if (!suser(cred, NULL))
return (0);
- mask = 0;
+ return(posix_cred_access(cred, pinfo->psem_uid, pinfo->psem_gid, pinfo->psem_mode, mode_req));
+}
- /* Otherwise, check the owner. */
- if (kauth_cred_getuid(cred) == pinfo->psem_uid) {
- if (mode & FREAD)
- mask |= S_IRUSR;
- if (mode & FWRITE)
- mask |= S_IWUSR;
- return ((pinfo->psem_mode & mask) == mask ? 0 : EACCES);
- }
+static int
+psem_unlink_internal(struct pseminfo *pinfo, struct psemcache *pcache)
+{
+ PSEM_SUBSYS_ASSERT_HELD();
+
+ if (!pinfo || !pcache)
+ return EINVAL;
+
+ if ((pinfo->psem_flags & (PSEM_DEFINED | PSEM_ALLOCATED)) == 0)
+ return EINVAL;
- /* Otherwise, check the groups. */
- if (kauth_cred_ismember_gid(cred, pinfo->psem_gid, &is_member) == 0 && is_member) {
- if (mode & FREAD)
- mask |= S_IRGRP;
- if (mode & FWRITE)
- mask |= S_IWGRP;
- return ((pinfo->psem_mode & mask) == mask ? 0 : EACCES);
+ if (pinfo->psem_flags & PSEM_INDELETE)
+ return 0;
+
+ AUDIT_ARG(posix_ipc_perm, pinfo->psem_uid, pinfo->psem_gid,
+ pinfo->psem_mode);
+
+ pinfo->psem_flags |= PSEM_INDELETE;
+ pinfo->psem_usecount--;
+
+ if (!pinfo->psem_usecount) {
+ psem_delete(pinfo);
+ FREE(pinfo,M_SHM);
+ } else {
+ pinfo->psem_flags |= PSEM_REMOVED;
}
- /* Otherwise, check everyone else. */
- if (mode & FREAD)
- mask |= S_IROTH;
- if (mode & FWRITE)
- mask |= S_IWOTH;
- return ((pinfo->psem_mode & mask) == mask ? 0 : EACCES);
+ psem_cache_delete(pcache);
+ FREE(pcache, M_SHM);
+ return 0;
}
+
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;
struct psemname nd;
struct pseminfo *pinfo;
- char * pnbuf;
char * nameptr;
char * cp;
- size_t pathlen, plen;
- int incache = 0;
+ char * pnbuf;
+ size_t pathlen;
struct psemcache *pcache = PSEMCACHE_NULL;
pinfo = PSEMINFO_NULL;
goto bad;
}
+ nameptr = pnbuf;
#ifdef PSXSEM_NAME_RESTRICT
- nameptr = pnbuf;
if (*nameptr == '/') {
while (*(nameptr++) == '/') {
- plen--;
+ pathlen--;
error = EINVAL;
goto bad;
}
}
#endif /* PSXSEM_NAME_RESTRICT */
- plen = pathlen;
- nameptr = pnbuf;
nd.psem_nameptr = nameptr;
- nd.psem_namelen = plen;
+ nd.psem_namelen = pathlen;
nd. psem_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.psem_hash += (unsigned char)*cp * i;
}
PSEM_SUBSYS_LOCK();
error = psem_cache_search(&pinfo, &nd, &pcache);
- if (error == ENOENT) {
+ if (error != PSEMCACHE_FOUND) {
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, kauth_cred_get())) ) {
- PSEM_SUBSYS_UNLOCK();
- goto bad;
- }
- if ((pinfo->psem_flags & (PSEM_DEFINED | PSEM_ALLOCATED))==0) {
+#if CONFIG_MACF
+ error = mac_posixsem_check_unlink(kauth_cred_get(), pinfo, nameptr);
+ if (error) {
PSEM_SUBSYS_UNLOCK();
- return (EINVAL);
+ goto bad;
}
-
- if ( (pinfo->psem_flags & PSEM_INDELETE) ) {
+#endif
+ if ( (error = psem_access(pinfo, pinfo->psem_mode, kauth_cred_get())) ) {
PSEM_SUBSYS_UNLOCK();
- error = 0;
goto bad;
}
- AUDIT_ARG(posix_ipc_perm, pinfo->psem_uid, pinfo->psem_gid,
- pinfo->psem_mode);
-
- pinfo->psem_flags |= PSEM_INDELETE;
- pinfo->psem_usecount--;
-
- if (!pinfo->psem_usecount) {
- psem_delete(pinfo);
- FREE(pinfo,M_SHM);
- } else
- pinfo->psem_flags |= PSEM_REMOVED;
-
- psem_cache_delete(pcache);
+ error = psem_unlink_internal(pinfo, pcache);
PSEM_SUBSYS_UNLOCK();
- FREE(pcache, M_SHM);
- error = 0;
+
bad:
FREE_ZONE(pnbuf, MAXPATHLEN, M_NAMEI);
- return (error);
+ return error;
}
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;
proc_fdunlock(p);
return(error);
}
+ if (fp->f_type != DTYPE_PSXSEM) {
+ proc_fdunlock(p);
+ return(EBADF);
+ }
+ 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);
+ fileproc_free(fp);
proc_fdunlock(p);
return(error);
}
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 ;
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) {
}
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 ;
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;
}
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 ;
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) {
return(error);
}
-int
-sem_init(__unused struct proc *p, __unused struct sem_init_args *uap, __unused register_t *retval)
-{
- return(ENOSYS);
-}
-
-int
-sem_destroy(__unused struct proc *p, __unused struct sem_destroy_args *uap, __unused register_t *retval)
-{
- return(ENOSYS);
-}
-
-int
-sem_getvalue(__unused struct proc *p, __unused struct sem_getvalue_args *uap, __unused register_t *retval)
-{
- 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;
- register struct pseminfo *pinfo;
+ struct pseminfo *pinfo;
PSEM_SUBSYS_LOCK();
if ((pinfo = pnode->pinfo) == PSEMINFO_NULL){
}
static int
-psem_closefile(fg, p)
- struct fileglob *fg;
- 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,
- 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);
}
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(__unused struct fileproc *fp, __unused struct uio *uio,
- __unused kauth_cred_t cred, __unused int flags,
- __unused struct proc *p)
+psem_read(__unused struct fileproc *fp, __unused struct uio *uio,
+ __unused int flags, __unused vfs_context_t ctx)
{
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)
+psem_write(__unused struct fileproc *fp, __unused struct uio *uio,
+ __unused int flags, __unused vfs_context_t ctx)
{
return(ENOTSUP);
}
static int
-psem_ioctl(__unused struct fileproc *fp, __unused u_long com,
- __unused caddr_t data, __unused struct proc *p)
+psem_ioctl(__unused struct fileproc *fp, __unused u_long com,
+ __unused caddr_t data, __unused vfs_context_t ctx)
{
return(ENOTSUP);
}
static int
-psem_select(__unused struct fileproc *fp, __unused int which,
- __unused void *wql, __unused struct proc *p)
+psem_select(__unused struct fileproc *fp, __unused int which,
+ __unused void *wql, __unused vfs_context_t ctx)
{
return(ENOTSUP);
}
static int
-psem_kqfilter(__unused struct fileproc *fp, __unused struct knote *kn,
- __unused struct proc *p)
+psem_kqfilter(__unused struct fileproc *fp, struct knote *kn,
+ __unused struct kevent_internal_s *kev, __unused vfs_context_t ctx)
+{
+ kn->kn_flags = EV_ERROR;
+ kn->kn_data = ENOTSUP;
+ return 0;
+}
+
+int
+fill_pseminfo(struct psemnode *pnode, struct psem_info * info)
{
- return (ENOTSUP);
+ 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