/*
- * Copyright (c) 2000 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@
*/
/* $NetBSD: sysv_shm.c,v 1.23 1994/07/04 23:25:12 glass Exp $ */
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
+/*
+ * NOTICE: This file was modified by McAfee Research in 2004 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.
+ * Copyright (c) 2005-2006 SPARTA, Inc.
+*/
#include <sys/appleapiopts.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
-#include <sys/shm.h>
-#include <sys/proc.h>
+#include <sys/shm_internal.h>
+#include <sys/proc_internal.h>
+#include <sys/kauth.h>
#include <sys/malloc.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
+#include <sys/ipcs.h>
+#include <sys/sysent.h>
+#include <sys/sysproto.h>
+#if CONFIG_MACF
+#include <security/mac_framework.h>
+#endif
+
+#include <security/audit/audit.h>
#include <mach/mach_types.h>
#include <mach/vm_inherit.h>
+#include <mach/vm_map.h>
+
+#include <mach/mach_vm.h>
+
#include <vm/vm_map.h>
+#include <vm/vm_protos.h>
+
+#include <kern/locks.h>
-struct shmat_args;
-extern int shmat __P((struct proc *p, struct shmat_args *uap, int *retval));
-struct shmctl_args;
-extern int shmctl __P((struct proc *p, struct shmctl_args *uap, int *retval));
-struct shmdt_args;
-extern int shmdt __P((struct proc *p, struct shmdt_args *uap, int *retval));
-struct shmget_args;
-extern int shmget __P((struct proc *p, struct shmget_args *uap, int *retval));
+/* Uncomment this line to see MAC debugging output. */
+/* #define MAC_DEBUG */
+#if CONFIG_MACF_DEBUG
+#define MPRINTF(a) printf a
+#else
+#define MPRINTF(a)
+#endif
+#if SYSV_SHM
+static void shminit(void *);
#if 0
-static void shminit __P((void *));
SYSINIT(sysv_shm, SI_SUB_SYSV_SHM, SI_ORDER_FIRST, shminit, NULL)
-#endif 0
+#endif
+
+static lck_grp_t *sysv_shm_subsys_lck_grp;
+static lck_grp_attr_t *sysv_shm_subsys_lck_grp_attr;
+static lck_attr_t *sysv_shm_subsys_lck_attr;
+static lck_mtx_t sysv_shm_subsys_mutex;
-struct oshmctl_args;
-static int oshmctl __P((struct proc *p, struct oshmctl_args *uap, int * retval));
-static int shmget_allocate_segment __P((struct proc *p, struct shmget_args *uap, int mode, int * retval));
-static int shmget_existing __P((struct proc *p, struct shmget_args *uap, int mode, int segnum, int * retval));
+#define SYSV_SHM_SUBSYS_LOCK() lck_mtx_lock(&sysv_shm_subsys_mutex)
+#define SYSV_SHM_SUBSYS_UNLOCK() lck_mtx_unlock(&sysv_shm_subsys_mutex)
-typedef int sy_call_t __P((struct proc *, void *, int *));
+static int oshmctl(void *p, void *uap, void *retval);
+static int shmget_allocate_segment(struct proc *p, struct shmget_args *uap, int mode, int * retval);
+static int shmget_existing(struct shmget_args *uap, int mode, int segnum, int * retval);
+static void shmid_ds_64to32(struct user_shmid_ds *in, struct user32_shmid_ds *out);
+static void shmid_ds_32to64(struct user32_shmid_ds *in, struct user_shmid_ds *out);
/* XXX casting to (sy_call_t *) is bogus, as usual. */
static sy_call_t *shmcalls[] = {
#define SHMSEG_WANTED 0x1000
static int shm_last_free, shm_nused, shm_committed;
-struct shmid_ds *shmsegs;
+struct shmid_kernel *shmsegs; /* 64 bit version */
static int shm_inited = 0;
+/*
+ * Since anonymous memory chunks are limited to ANON_MAX_SIZE bytes,
+ * we have to keep a list of chunks when we want to handle a shared memory
+ * segment bigger than ANON_MAX_SIZE.
+ * Each chunk points to a VM named entry of up to ANON_MAX_SIZE bytes
+ * of anonymous memory.
+ */
struct shm_handle {
- /* vm_offset_t kva; */
- void * shm_object;
+ void * shm_object; /* named entry for this chunk*/
+ memory_object_size_t shm_handle_size; /* size of this chunk */
+ struct shm_handle *shm_handle_next; /* next chunk */
};
struct shmmap_state {
- vm_offset_t va;
- int shmid;
+ mach_vm_address_t va; /* user address */
+ int shmid; /* segment id */
};
-static void shm_deallocate_segment __P((struct shmid_ds *));
-static int shm_find_segment_by_key __P((key_t));
-static struct shmid_ds *shm_find_segment_by_shmid __P((int));
-static int shm_delete_mapping __P((struct proc *, struct shmmap_state *));
+static void shm_deallocate_segment(struct shmid_kernel *);
+static int shm_find_segment_by_key(key_t);
+static struct shmid_kernel *shm_find_segment_by_shmid(int);
+static int shm_delete_mapping(struct proc *, struct shmmap_state *, int);
#ifdef __APPLE_API_PRIVATE
+#define DEFAULT_SHMMAX (4 * 1024 * 1024)
+#define DEFAULT_SHMMIN 1
+#define DEFAULT_SHMMNI 32
+#define DEFAULT_SHMSEG 8
+#define DEFAULT_SHMALL 1024
struct shminfo shminfo = {
- -1, /* SHMMAX 4096 *1024 */
- -1, /* SHMMIN = 1 */
- -1, /* SHMMNI = 1 */
- -1, /* SHMSEG = 8 */
- -1 /* SHMALL = 1024 */
+ DEFAULT_SHMMAX,
+ DEFAULT_SHMMIN,
+ DEFAULT_SHMMNI,
+ DEFAULT_SHMSEG,
+ DEFAULT_SHMALL
};
#endif /* __APPLE_API_PRIVATE */
+void sysv_shm_lock_init(void);
+
+static __inline__ time_t
+sysv_shmtime(void)
+{
+ struct timeval tv;
+ microtime(&tv);
+ return (tv.tv_sec);
+}
+
+/*
+ * This conversion is safe, since if we are converting for a 32 bit process,
+ * then it's value of (struct shmid_ds)->shm_segsz will never exceed 4G.
+ *
+ * NOTE: Source and target may *NOT* overlap! (target is smaller)
+ */
+static void
+shmid_ds_64to32(struct user_shmid_ds *in, struct user32_shmid_ds *out)
+{
+ out->shm_perm = in->shm_perm;
+ out->shm_segsz = in->shm_segsz;
+ out->shm_lpid = in->shm_lpid;
+ out->shm_cpid = in->shm_cpid;
+ out->shm_nattch = in->shm_nattch;
+ out->shm_atime = in->shm_atime;
+ out->shm_dtime = in->shm_dtime;
+ out->shm_ctime = in->shm_ctime;
+ out->shm_internal = CAST_DOWN_EXPLICIT(int,in->shm_internal);
+}
+
+/*
+ * NOTE: Source and target may are permitted to overlap! (source is smaller);
+ * this works because we copy fields in order from the end of the struct to
+ * the beginning.
+ */
+static void
+shmid_ds_32to64(struct user32_shmid_ds *in, struct user_shmid_ds *out)
+{
+ out->shm_internal = in->shm_internal;
+ out->shm_ctime = in->shm_ctime;
+ out->shm_dtime = in->shm_dtime;
+ out->shm_atime = in->shm_atime;
+ out->shm_nattch = in->shm_nattch;
+ out->shm_cpid = in->shm_cpid;
+ out->shm_lpid = in->shm_lpid;
+ out->shm_segsz = in->shm_segsz;
+ out->shm_perm = in->shm_perm;
+}
+
+
static int
-shm_find_segment_by_key(key)
- key_t key;
+shm_find_segment_by_key(key_t key)
{
int i;
for (i = 0; i < shminfo.shmmni; i++)
- if ((shmsegs[i].shm_perm.mode & SHMSEG_ALLOCATED) &&
- shmsegs[i].shm_perm.key == key)
+ if ((shmsegs[i].u.shm_perm.mode & SHMSEG_ALLOCATED) &&
+ shmsegs[i].u.shm_perm._key == key)
return i;
return -1;
}
-static struct shmid_ds *
-shm_find_segment_by_shmid(shmid)
- int shmid;
+static struct shmid_kernel *
+shm_find_segment_by_shmid(int shmid)
{
int segnum;
- struct shmid_ds *shmseg;
+ struct shmid_kernel *shmseg;
segnum = IPCID_TO_IX(shmid);
if (segnum < 0 || segnum >= shminfo.shmmni)
return NULL;
shmseg = &shmsegs[segnum];
- if ((shmseg->shm_perm.mode & (SHMSEG_ALLOCATED | SHMSEG_REMOVED))
+ if ((shmseg->u.shm_perm.mode & (SHMSEG_ALLOCATED | SHMSEG_REMOVED))
!= SHMSEG_ALLOCATED ||
- shmseg->shm_perm.seq != IPCID_TO_SEQ(shmid))
+ shmseg->u.shm_perm._seq != IPCID_TO_SEQ(shmid))
return NULL;
return shmseg;
}
static void
-shm_deallocate_segment(shmseg)
- struct shmid_ds *shmseg;
+shm_deallocate_segment(struct shmid_kernel *shmseg)
{
- struct shm_handle *shm_handle;
- struct shmmap_state *shmmap_s=NULL;
- size_t size;
- char * ptr;
-
- shm_handle = shmseg->shm_internal;
- size = round_page(shmseg->shm_segsz);
- mach_destroy_memory_entry(shm_handle->shm_object);
- FREE((caddr_t)shm_handle, M_SHM);
- shmseg->shm_internal = NULL;
+ struct shm_handle *shm_handle, *shm_handle_next;
+ mach_vm_size_t size;
+
+ for (shm_handle = CAST_DOWN(void *,shmseg->u.shm_internal); /* tunnel */
+ shm_handle != NULL;
+ shm_handle = shm_handle_next) {
+ shm_handle_next = shm_handle->shm_handle_next;
+ mach_memory_entry_port_release(shm_handle->shm_object);
+ FREE((caddr_t) shm_handle, M_SHM);
+ }
+ shmseg->u.shm_internal = USER_ADDR_NULL; /* tunnel */
+ size = mach_vm_round_page(shmseg->u.shm_segsz);
shm_committed -= btoc(size);
shm_nused--;
- shmseg->shm_perm.mode = SHMSEG_FREE;
+ shmseg->u.shm_perm.mode = SHMSEG_FREE;
+#if CONFIG_MACF
+ /* Reset the MAC label */
+ mac_sysvshm_label_recycle(shmseg);
+#endif
}
static int
-shm_delete_mapping(p, shmmap_s)
- struct proc *p;
- struct shmmap_state *shmmap_s;
+shm_delete_mapping(__unused struct proc *p, struct shmmap_state *shmmap_s,
+ int deallocate)
{
- struct shmid_ds *shmseg;
+ struct shmid_kernel *shmseg;
int segnum, result;
- size_t size;
+ mach_vm_size_t size;
segnum = IPCID_TO_IX(shmmap_s->shmid);
shmseg = &shmsegs[segnum];
- size = round_page(shmseg->shm_segsz);
- result = vm_deallocate(current_map(), shmmap_s->va, size);
+ size = mach_vm_round_page(shmseg->u.shm_segsz); /* XXX done for us? */
+ if (deallocate) {
+ result = mach_vm_deallocate(current_map(), shmmap_s->va, size);
if (result != KERN_SUCCESS)
return EINVAL;
+ }
shmmap_s->shmid = -1;
- shmseg->shm_dtime = time_second;
- if ((--shmseg->shm_nattch <= 0) &&
- (shmseg->shm_perm.mode & SHMSEG_REMOVED)) {
+ shmseg->u.shm_dtime = sysv_shmtime();
+ if ((--shmseg->u.shm_nattch <= 0) &&
+ (shmseg->u.shm_perm.mode & SHMSEG_REMOVED)) {
shm_deallocate_segment(shmseg);
shm_last_free = segnum;
}
return 0;
}
-struct shmdt_args {
- void *shmaddr;
-};
-
int
-shmdt(p, uap, retval)
- struct proc *p;
- struct shmdt_args *uap;
- register_t *retval;
+shmdt(struct proc *p, struct shmdt_args *uap, int32_t *retval)
{
+#if CONFIG_MACF
+ struct shmid_kernel *shmsegptr;
+#endif
struct shmmap_state *shmmap_s;
int i;
+ int shmdtret = 0;
+
+ AUDIT_ARG(svipc_addr, uap->shmaddr);
- if (!shm_inited)
- return(EINVAL);
+ SYSV_SHM_SUBSYS_LOCK();
+
+ if (!shm_inited) {
+ shminit(NULL);
+ }
shmmap_s = (struct shmmap_state *)p->vm_shm;
- if (shmmap_s == NULL)
- return EINVAL;
+ if (shmmap_s == NULL) {
+ shmdtret = EINVAL;
+ goto shmdt_out;
+ }
+
for (i = 0; i < shminfo.shmseg; i++, shmmap_s++)
if (shmmap_s->shmid != -1 &&
- shmmap_s->va == (vm_offset_t)uap->shmaddr)
+ shmmap_s->va == (mach_vm_offset_t)uap->shmaddr)
break;
- if (i == shminfo.shmseg)
- return EINVAL;
- return shm_delete_mapping(p, shmmap_s);
-}
-
-#ifndef _SYS_SYSPROTO_H_
-struct shmat_args {
- int shmid;
- void *shmaddr;
- int shmflg;
-};
+ if (i == shminfo.shmseg) {
+ shmdtret = EINVAL;
+ goto shmdt_out;
+ }
+#if CONFIG_MACF
+ /*
+ * XXX: It might be useful to move this into the shm_delete_mapping
+ * function
+ */
+ shmsegptr = &shmsegs[IPCID_TO_IX(shmmap_s->shmid)];
+ shmdtret = mac_sysvshm_check_shmdt(kauth_cred_get(), shmsegptr);
+ if (shmdtret)
+ goto shmdt_out;
#endif
+ i = shm_delete_mapping(p, shmmap_s, 1);
+
+ if (i == 0)
+ *retval = 0;
+ shmdtret = i;
+shmdt_out:
+ SYSV_SHM_SUBSYS_UNLOCK();
+ return shmdtret;
+}
int
-shmat(p, uap, retval)
- struct proc *p;
- struct shmat_args *uap;
- register_t *retval;
+shmat(struct proc *p, struct shmat_args *uap, user_addr_t *retval)
{
int error, i, flags;
- struct ucred *cred = p->p_ucred;
- struct shmid_ds *shmseg;
- struct shmmap_state *shmmap_s = NULL;
- struct shm_handle *shm_handle;
- vm_offset_t attach_va;
- vm_prot_t prot;
- vm_size_t size;
- kern_return_t rv;
+ struct shmid_kernel *shmseg;
+ struct shmmap_state *shmmap_s = NULL;
+ struct shm_handle *shm_handle;
+ mach_vm_address_t attach_va; /* attach address in/out */
+ mach_vm_size_t map_size; /* size of map entry */
+ mach_vm_size_t mapped_size;
+ vm_prot_t prot;
+ size_t size;
+ kern_return_t rv;
+ int shmat_ret;
+ int vm_flags;
+
+ shmat_ret = 0;
+
+ AUDIT_ARG(svipc_id, uap->shmid);
+ AUDIT_ARG(svipc_addr, uap->shmaddr);
+
+ SYSV_SHM_SUBSYS_LOCK();
+
+ if (!shm_inited) {
+ shminit(NULL);
+ }
- if (!shm_inited)
- return(EINVAL);
shmmap_s = (struct shmmap_state *)p->vm_shm;
+
if (shmmap_s == NULL) {
size = shminfo.shmseg * sizeof(struct shmmap_state);
- shmmap_s = (struct shmmap_state *)_MALLOC(size, M_SHM, M_WAITOK);
+ MALLOC(shmmap_s, struct shmmap_state *, size, M_SHM, M_WAITOK);
+ if (shmmap_s == NULL) {
+ shmat_ret = ENOMEM;
+ goto shmat_out;
+ }
for (i = 0; i < shminfo.shmseg; i++)
shmmap_s[i].shmid = -1;
p->vm_shm = (caddr_t)shmmap_s;
}
shmseg = shm_find_segment_by_shmid(uap->shmid);
- if (shmseg == NULL)
- return EINVAL;
- error = ipcperm(cred, &shmseg->shm_perm,
+ if (shmseg == NULL) {
+ shmat_ret = EINVAL;
+ goto shmat_out;
+ }
+
+ AUDIT_ARG(svipc_perm, &shmseg->u.shm_perm);
+ error = ipcperm(kauth_cred_get(), &shmseg->u.shm_perm,
(uap->shmflg & SHM_RDONLY) ? IPC_R : IPC_R|IPC_W);
- if (error)
- return error;
+ if (error) {
+ shmat_ret = error;
+ goto shmat_out;
+ }
+
+#if CONFIG_MACF
+ error = mac_sysvshm_check_shmat(kauth_cred_get(), shmseg, uap->shmflg);
+ if (error) {
+ shmat_ret = error;
+ goto shmat_out;
+ }
+#endif
for (i = 0; i < shminfo.shmseg; i++) {
if (shmmap_s->shmid == -1)
break;
shmmap_s++;
}
- if (i >= shminfo.shmseg)
- return EMFILE;
- size = round_page(shmseg->shm_segsz);
+ if (i >= shminfo.shmseg) {
+ shmat_ret = EMFILE;
+ goto shmat_out;
+ }
+
+ map_size = mach_vm_round_page(shmseg->u.shm_segsz);
prot = VM_PROT_READ;
if ((uap->shmflg & SHM_RDONLY) == 0)
prot |= VM_PROT_WRITE;
flags = MAP_ANON | MAP_SHARED;
- if (uap->shmaddr) {
+ if (uap->shmaddr)
flags |= MAP_FIXED;
- if (uap->shmflg & SHM_RND)
- attach_va = (vm_offset_t)uap->shmaddr & ~(SHMLBA-1);
- else if (((vm_offset_t)uap->shmaddr & (SHMLBA-1)) == 0)
- attach_va = (vm_offset_t)uap->shmaddr;
- else
- return EINVAL;
+
+ attach_va = (mach_vm_address_t)uap->shmaddr;
+ if (uap->shmflg & SHM_RND)
+ attach_va &= ~(SHMLBA-1);
+ else if ((attach_va & (SHMLBA-1)) != 0) {
+ shmat_ret = EINVAL;
+ goto shmat_out;
+ }
+
+ if (flags & MAP_FIXED) {
+ vm_flags = VM_FLAGS_FIXED;
} else {
- attach_va = round_page(uap->shmaddr);
+ vm_flags = VM_FLAGS_ANYWHERE;
}
- shm_handle = shmseg->shm_internal;
- rv = vm_map(current_map(), &attach_va, size, 0, (flags & MAP_FIXED)? FALSE: TRUE,
- shm_handle->shm_object, 0, FALSE, prot, prot, VM_INHERIT_DEFAULT);
- if (rv != KERN_SUCCESS)
- goto out;
- rv = vm_inherit(current_map(), attach_va, size,
- VM_INHERIT_SHARE);
+ mapped_size = 0;
+
+ /* first reserve enough space... */
+ rv = mach_vm_map(current_map(),
+ &attach_va,
+ map_size,
+ 0,
+ vm_flags,
+ IPC_PORT_NULL,
+ 0,
+ FALSE,
+ VM_PROT_NONE,
+ VM_PROT_NONE,
+ VM_INHERIT_NONE);
if (rv != KERN_SUCCESS) {
- (void) vm_deallocate(current_map(), attach_va, size);
goto out;
}
shmmap_s->va = attach_va;
+
+ /* ... then map the shared memory over the reserved space */
+ for (shm_handle = CAST_DOWN(void *, shmseg->u.shm_internal);/* tunnel */
+ shm_handle != NULL;
+ shm_handle = shm_handle->shm_handle_next) {
+
+ rv = vm_map_enter_mem_object(
+ current_map(), /* process map */
+ &attach_va, /* attach address */
+ shm_handle->shm_handle_size, /* segment size */
+ (mach_vm_offset_t)0, /* alignment mask */
+ VM_FLAGS_FIXED | VM_FLAGS_OVERWRITE,
+ shm_handle->shm_object,
+ (mach_vm_offset_t)0,
+ FALSE,
+ prot,
+ prot,
+ VM_INHERIT_SHARE);
+ if (rv != KERN_SUCCESS)
+ goto out;
+
+ mapped_size += shm_handle->shm_handle_size;
+ attach_va = attach_va + shm_handle->shm_handle_size;
+ }
+
shmmap_s->shmid = uap->shmid;
- shmseg->shm_lpid = p->p_pid;
- shmseg->shm_atime = time_second;
- shmseg->shm_nattch++;
- *retval = attach_va;
- return( 0);
+ shmseg->u.shm_lpid = p->p_pid;
+ shmseg->u.shm_atime = sysv_shmtime();
+ shmseg->u.shm_nattch++;
+ *retval = shmmap_s->va; /* XXX return -1 on error */
+ shmat_ret = 0;
+ goto shmat_out;
out:
+ if (mapped_size > 0) {
+ (void) mach_vm_deallocate(current_map(),
+ shmmap_s->va,
+ mapped_size);
+ }
switch (rv) {
case KERN_INVALID_ADDRESS:
case KERN_NO_SPACE:
- return (ENOMEM);
+ shmat_ret = ENOMEM;
+ break;
case KERN_PROTECTION_FAILURE:
- return (EACCES);
+ shmat_ret = EACCES;
+ break;
default:
- return (EINVAL);
+ shmat_ret = EINVAL;
+ break;
}
-
+shmat_out:
+ SYSV_SHM_SUBSYS_UNLOCK();
+ return shmat_ret;
}
-struct oshmid_ds {
- struct ipc_perm shm_perm; /* operation perms */
- int shm_segsz; /* size of segment (bytes) */
- ushort shm_cpid; /* pid, creator */
- ushort shm_lpid; /* pid, last operation */
- short shm_nattch; /* no. of current attaches */
- time_t shm_atime; /* last attach time */
- time_t shm_dtime; /* last detach time */
- time_t shm_ctime; /* last change time */
- void *shm_handle; /* internal handle for shm segment */
-};
-
-struct oshmctl_args {
- int shmid;
- int cmd;
- struct oshmid_ds *ubuf;
-};
-
static int
-oshmctl(p, uap, retval)
- struct proc *p;
- struct oshmctl_args *uap;
- register_t *retval;
+oshmctl(__unused void *p, __unused void *uap, __unused void *retval)
{
-#ifdef COMPAT_43
- int error;
- struct ucred *cred = p->p_ucred;
- struct shmid_ds *shmseg;
- struct oshmid_ds outbuf;
-
- if (!shm_inited)
- return(EINVAL);
- shmseg = shm_find_segment_by_shmid(uap->shmid);
- if (shmseg == NULL)
- return EINVAL;
- switch (uap->cmd) {
- case IPC_STAT:
- error = ipcperm(cred, &shmseg->shm_perm, IPC_R);
- if (error)
- return error;
- outbuf.shm_perm = shmseg->shm_perm;
- outbuf.shm_segsz = shmseg->shm_segsz;
- outbuf.shm_cpid = shmseg->shm_cpid;
- outbuf.shm_lpid = shmseg->shm_lpid;
- outbuf.shm_nattch = shmseg->shm_nattch;
- outbuf.shm_atime = shmseg->shm_atime;
- outbuf.shm_dtime = shmseg->shm_dtime;
- outbuf.shm_ctime = shmseg->shm_ctime;
- outbuf.shm_handle = shmseg->shm_internal;
- error = copyout((caddr_t)&outbuf, uap->ubuf, sizeof(outbuf));
- if (error)
- return error;
- break;
- default:
- /* XXX casting to (sy_call_t *) is bogus, as usual. */
- return ((sy_call_t *)shmctl)(p, uap, retval);
- }
- return 0;
-#else
return EINVAL;
-#endif
}
-#ifndef _SYS_SYSPROTO_H_
-struct shmctl_args {
- int shmid;
- int cmd;
- struct shmid_ds *buf;
-};
-#endif
-
+/*
+ * Returns: 0 Success
+ * EINVAL
+ * copyout:EFAULT
+ * copyin:EFAULT
+ * ipcperm:EPERM
+ * ipcperm:EACCES
+ */
int
-shmctl(p, uap, retval)
- struct proc *p;
- struct shmctl_args *uap;
- register_t *retval;
+shmctl(__unused struct proc *p, struct shmctl_args *uap, int32_t *retval)
{
int error;
- struct ucred *cred = p->p_ucred;
- struct shmid_ds inbuf;
- struct shmid_ds *shmseg;
+ kauth_cred_t cred = kauth_cred_get();
+ struct user_shmid_ds inbuf;
+ struct shmid_kernel *shmseg;
+
+ int shmctl_ret = 0;
+
+ AUDIT_ARG(svipc_cmd, uap->cmd);
+ AUDIT_ARG(svipc_id, uap->shmid);
+
+ SYSV_SHM_SUBSYS_LOCK();
+
+ if (!shm_inited) {
+ shminit(NULL);
+ }
- if (!shm_inited)
- return(EINVAL);
shmseg = shm_find_segment_by_shmid(uap->shmid);
- if (shmseg == NULL)
- return EINVAL;
+ if (shmseg == NULL) {
+ shmctl_ret = EINVAL;
+ goto shmctl_out;
+ }
+
+ /* XXAUDIT: This is the perms BEFORE any change by this call. This
+ * may not be what is desired.
+ */
+ AUDIT_ARG(svipc_perm, &shmseg->u.shm_perm);
+
+#if CONFIG_MACF
+ error = mac_sysvshm_check_shmctl(cred, shmseg, uap->cmd);
+ if (error) {
+ shmctl_ret = error;
+ goto shmctl_out;
+ }
+#endif
switch (uap->cmd) {
case IPC_STAT:
- error = ipcperm(cred, &shmseg->shm_perm, IPC_R);
- if (error)
- return error;
- error = copyout((caddr_t)shmseg, uap->buf, sizeof(inbuf));
- if (error)
- return error;
+ error = ipcperm(cred, &shmseg->u.shm_perm, IPC_R);
+ if (error) {
+ shmctl_ret = error;
+ goto shmctl_out;
+ }
+
+ if (IS_64BIT_PROCESS(p)) {
+ struct user_shmid_ds shmid_ds;
+ memcpy(&shmid_ds, &shmseg->u, sizeof(struct user_shmid_ds));
+
+ /* Clear kernel reserved pointer before copying to user space */
+ shmid_ds.shm_internal = USER_ADDR_NULL;
+
+ error = copyout(&shmid_ds, uap->buf, sizeof(shmid_ds));
+ } else {
+ struct user32_shmid_ds shmid_ds32;
+ shmid_ds_64to32(&shmseg->u, &shmid_ds32);
+
+ /* Clear kernel reserved pointer before copying to user space */
+ shmid_ds32.shm_internal = (user32_addr_t)0;
+
+ error = copyout(&shmid_ds32, uap->buf, sizeof(shmid_ds32));
+ }
+ if (error) {
+ shmctl_ret = error;
+ goto shmctl_out;
+ }
break;
case IPC_SET:
- error = ipcperm(cred, &shmseg->shm_perm, IPC_M);
- if (error)
- return error;
- error = copyin(uap->buf, (caddr_t)&inbuf, sizeof(inbuf));
- if (error)
- return error;
- shmseg->shm_perm.uid = inbuf.shm_perm.uid;
- shmseg->shm_perm.gid = inbuf.shm_perm.gid;
- shmseg->shm_perm.mode =
- (shmseg->shm_perm.mode & ~ACCESSPERMS) |
+ error = ipcperm(cred, &shmseg->u.shm_perm, IPC_M);
+ if (error) {
+ shmctl_ret = error;
+ goto shmctl_out;
+ }
+ if (IS_64BIT_PROCESS(p)) {
+ error = copyin(uap->buf, &inbuf, sizeof(struct user_shmid_ds));
+ } else {
+ struct user32_shmid_ds shmid_ds32;
+ error = copyin(uap->buf, &shmid_ds32, sizeof(shmid_ds32));
+ /* convert in place; ugly, but safe */
+ shmid_ds_32to64(&shmid_ds32, &inbuf);
+ }
+ if (error) {
+ shmctl_ret = error;
+ goto shmctl_out;
+ }
+ shmseg->u.shm_perm.uid = inbuf.shm_perm.uid;
+ shmseg->u.shm_perm.gid = inbuf.shm_perm.gid;
+ shmseg->u.shm_perm.mode =
+ (shmseg->u.shm_perm.mode & ~ACCESSPERMS) |
(inbuf.shm_perm.mode & ACCESSPERMS);
- shmseg->shm_ctime = time_second;
+ shmseg->u.shm_ctime = sysv_shmtime();
break;
case IPC_RMID:
- error = ipcperm(cred, &shmseg->shm_perm, IPC_M);
- if (error)
- return error;
- shmseg->shm_perm.key = IPC_PRIVATE;
- shmseg->shm_perm.mode |= SHMSEG_REMOVED;
- if (shmseg->shm_nattch <= 0) {
+ error = ipcperm(cred, &shmseg->u.shm_perm, IPC_M);
+ if (error) {
+ shmctl_ret = error;
+ goto shmctl_out;
+ }
+ shmseg->u.shm_perm._key = IPC_PRIVATE;
+ shmseg->u.shm_perm.mode |= SHMSEG_REMOVED;
+ if (shmseg->u.shm_nattch <= 0) {
shm_deallocate_segment(shmseg);
shm_last_free = IPCID_TO_IX(uap->shmid);
}
case SHM_UNLOCK:
#endif
default:
- return EINVAL;
+ shmctl_ret = EINVAL;
+ goto shmctl_out;
}
- return 0;
+ *retval = 0;
+ shmctl_ret = 0;
+shmctl_out:
+ SYSV_SHM_SUBSYS_UNLOCK();
+ return shmctl_ret;
}
-#ifndef _SYS_SYSPROTO_H_
-struct shmget_args {
- key_t key;
- size_t size;
- int shmflg;
-};
-#endif
-
static int
-shmget_existing(p, uap, mode, segnum, retval)
- struct proc *p;
- struct shmget_args *uap;
- int mode;
- int segnum;
- int *retval;
+shmget_existing(struct shmget_args *uap, int mode, int segnum, int *retval)
{
- struct shmid_ds *shmseg;
- struct ucred *cred = p->p_ucred;
- int error;
+ struct shmid_kernel *shmseg;
+ int error = 0;
shmseg = &shmsegs[segnum];
- if (shmseg->shm_perm.mode & SHMSEG_REMOVED) {
+ if (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) {
/*
* This segment is in the process of being allocated. Wait
* until it's done, and look the key up again (in case the
* allocation failed or it was freed).
*/
- shmseg->shm_perm.mode |= SHMSEG_WANTED;
+ shmseg->u.shm_perm.mode |= SHMSEG_WANTED;
error = tsleep((caddr_t)shmseg, PLOCK | PCATCH, "shmget", 0);
if (error)
return error;
return EAGAIN;
}
- error = ipcperm(cred, &shmseg->shm_perm, mode);
- if (error)
- return error;
- if (uap->size && uap->size > shmseg->shm_segsz)
+
+ /*
+ * The low 9 bits of shmflag are the mode bits being requested, which
+ * are the actual mode bits desired on the segment, and not in IPC_R
+ * form; therefore it would be incorrect to call ipcperm() to validate
+ * them; instead, we AND the existing mode with the requested mode, and
+ * verify that it matches the requested mode; otherwise, we fail with
+ * EACCES (access denied).
+ */
+ if ((shmseg->u.shm_perm.mode & mode) != mode)
+ return EACCES;
+
+#if CONFIG_MACF
+ error = mac_sysvshm_check_shmget(kauth_cred_get(), shmseg, uap->shmflg);
+ if (error)
+ return (error);
+#endif
+
+ if (uap->size && uap->size > shmseg->u.shm_segsz)
return EINVAL;
+
if ((uap->shmflg & (IPC_CREAT | IPC_EXCL)) == (IPC_CREAT | IPC_EXCL))
return EEXIST;
- *retval = IXSEQ_TO_IPCID(segnum, shmseg->shm_perm);
+
+ *retval = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm);
return 0;
}
static int
-shmget_allocate_segment(p, uap, mode, retval)
- struct proc *p;
- struct shmget_args *uap;
- int mode;
- int * retval;
+shmget_allocate_segment(struct proc *p, struct shmget_args *uap, int mode,
+ int *retval)
{
- int i, segnum, shmid, size;
- struct ucred *cred = p->p_ucred;
- struct shmid_ds *shmseg;
+ int i, segnum, shmid;
+ kauth_cred_t cred = kauth_cred_get();
+ struct shmid_kernel *shmseg;
struct shm_handle *shm_handle;
kern_return_t kret;
- vm_offset_t user_addr;
+ mach_vm_size_t total_size, size, alloc_size;
void * mem_object;
+ struct shm_handle *shm_handle_next, **shm_handle_next_p;
- if (uap->size < shminfo.shmmin || uap->size > shminfo.shmmax)
+ if (uap->size < (user_size_t)shminfo.shmmin ||
+ uap->size > (user_size_t)shminfo.shmmax)
return EINVAL;
if (shm_nused >= shminfo.shmmni) /* any shmids left? */
return ENOSPC;
- size = round_page(uap->size);
- if (shm_committed + btoc(size) > shminfo.shmall)
+ total_size = mach_vm_round_page(uap->size);
+ if ((user_ssize_t)(shm_committed + btoc(total_size)) > shminfo.shmall)
return ENOMEM;
if (shm_last_free < 0) {
for (i = 0; i < shminfo.shmmni; i++)
- if (shmsegs[i].shm_perm.mode & SHMSEG_FREE)
+ if (shmsegs[i].u.shm_perm.mode & SHMSEG_FREE)
break;
if (i == shminfo.shmmni)
panic("shmseg free count inconsistent");
shm_last_free = -1;
}
shmseg = &shmsegs[segnum];
+
/*
* In case we sleep in malloc(), mark the segment present but deleted
* so that noone else tries to create the same key.
+ * XXX but we don't release the global lock !?
*/
- kret = vm_allocate(current_map(), &user_addr, size, TRUE);
- if (kret != KERN_SUCCESS)
- goto out;
+ shmseg->u.shm_perm.mode = SHMSEG_ALLOCATED | SHMSEG_REMOVED;
+ shmseg->u.shm_perm._key = uap->key;
+ shmseg->u.shm_perm._seq = (shmseg->u.shm_perm._seq + 1) & 0x7fff;
+
+ shm_handle_next_p = NULL;
+ for (alloc_size = 0;
+ alloc_size < total_size;
+ alloc_size += size) {
+ size = MIN(total_size - alloc_size, ANON_MAX_SIZE);
+ kret = mach_make_memory_entry_64(
+ VM_MAP_NULL,
+ (memory_object_size_t *) &size,
+ (memory_object_offset_t) 0,
+ MAP_MEM_NAMED_CREATE | VM_PROT_DEFAULT,
+ (ipc_port_t *) &mem_object, 0);
+ if (kret != KERN_SUCCESS)
+ goto out;
+
+ MALLOC(shm_handle, struct shm_handle *, sizeof(struct shm_handle), M_SHM, M_WAITOK);
+ if (shm_handle == NULL) {
+ kret = KERN_NO_SPACE;
+ mach_memory_entry_port_release(mem_object);
+ mem_object = NULL;
+ goto out;
+ }
+ shm_handle->shm_object = mem_object;
+ shm_handle->shm_handle_size = size;
+ shm_handle->shm_handle_next = NULL;
+ if (shm_handle_next_p == NULL) {
+ shmseg->u.shm_internal = CAST_USER_ADDR_T(shm_handle);/* tunnel */
+ } else {
+ *shm_handle_next_p = shm_handle;
+ }
+ shm_handle_next_p = &shm_handle->shm_handle_next;
+ }
- kret = mach_make_memory_entry (current_map(), &size,
- user_addr, VM_PROT_DEFAULT, &mem_object, 0);
+ shmid = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm);
- if (kret != KERN_SUCCESS)
- goto out;
- shmseg->shm_perm.mode = SHMSEG_ALLOCATED | SHMSEG_REMOVED;
- shmseg->shm_perm.key = uap->key;
- shmseg->shm_perm.seq = (shmseg->shm_perm.seq + 1) & 0x7fff;
- shm_handle = (struct shm_handle *)
- _MALLOC(sizeof(struct shm_handle), M_SHM, M_WAITOK);
- shm_handle->shm_object = mem_object;
- shmid = IXSEQ_TO_IPCID(segnum, shmseg->shm_perm);
-
- shmseg->shm_internal = shm_handle;
- shmseg->shm_perm.cuid = shmseg->shm_perm.uid = cred->cr_uid;
- shmseg->shm_perm.cgid = shmseg->shm_perm.gid = cred->cr_gid;
- shmseg->shm_perm.mode = (shmseg->shm_perm.mode & SHMSEG_WANTED) |
+ shmseg->u.shm_perm.cuid = shmseg->u.shm_perm.uid = kauth_cred_getuid(cred);
+ shmseg->u.shm_perm.cgid = shmseg->u.shm_perm.gid = kauth_cred_getgid(cred);
+ shmseg->u.shm_perm.mode = (shmseg->u.shm_perm.mode & SHMSEG_WANTED) |
(mode & ACCESSPERMS) | SHMSEG_ALLOCATED;
- shmseg->shm_segsz = uap->size;
- shmseg->shm_cpid = p->p_pid;
- shmseg->shm_lpid = shmseg->shm_nattch = 0;
- shmseg->shm_atime = shmseg->shm_dtime = 0;
- shmseg->shm_ctime = time_second;
+ shmseg->u.shm_segsz = uap->size;
+ shmseg->u.shm_cpid = p->p_pid;
+ shmseg->u.shm_lpid = shmseg->u.shm_nattch = 0;
+ shmseg->u.shm_atime = shmseg->u.shm_dtime = 0;
+#if CONFIG_MACF
+ mac_sysvshm_label_associate(cred, shmseg);
+#endif
+ shmseg->u.shm_ctime = sysv_shmtime();
shm_committed += btoc(size);
shm_nused++;
- if (shmseg->shm_perm.mode & SHMSEG_WANTED) {
+ AUDIT_ARG(svipc_perm, &shmseg->u.shm_perm);
+ if (shmseg->u.shm_perm.mode & SHMSEG_WANTED) {
/*
* Somebody else wanted this key while we were asleep. Wake
* them up now.
*/
- shmseg->shm_perm.mode &= ~SHMSEG_WANTED;
+ shmseg->u.shm_perm.mode &= ~SHMSEG_WANTED;
wakeup((caddr_t)shmseg);
}
*retval = shmid;
+ AUDIT_ARG(svipc_id, shmid);
return 0;
out:
+ if (kret != KERN_SUCCESS) {
+ for (shm_handle = CAST_DOWN(void *,shmseg->u.shm_internal); /* tunnel */
+ shm_handle != NULL;
+ shm_handle = shm_handle_next) {
+ shm_handle_next = shm_handle->shm_handle_next;
+ mach_memory_entry_port_release(shm_handle->shm_object);
+ FREE((caddr_t) shm_handle, M_SHM);
+ }
+ shmseg->u.shm_internal = USER_ADDR_NULL; /* tunnel */
+ }
+
switch (kret) {
case KERN_INVALID_ADDRESS:
case KERN_NO_SPACE:
}
int
-shmget(p, uap, retval)
- struct proc *p;
- struct shmget_args *uap;
- register_t *retval;
+shmget(struct proc *p, struct shmget_args *uap, int32_t *retval)
{
int segnum, mode, error;
+ int shmget_ret = 0;
+
+ /* Auditing is actually done in shmget_allocate_segment() */
- if (!shm_inited)
- return(EINVAL);
+ SYSV_SHM_SUBSYS_LOCK();
+
+ if (!shm_inited) {
+ shminit(NULL);
+ }
mode = uap->shmflg & ACCESSPERMS;
if (uap->key != IPC_PRIVATE) {
again:
segnum = shm_find_segment_by_key(uap->key);
if (segnum >= 0) {
- error = shmget_existing(p, uap, mode, segnum, retval);
+ error = shmget_existing(uap, mode, segnum, retval);
if (error == EAGAIN)
goto again;
- return(error);
+ shmget_ret = error;
+ goto shmget_out;
+ }
+ if ((uap->shmflg & IPC_CREAT) == 0) {
+ shmget_ret = ENOENT;
+ goto shmget_out;
}
- if ((uap->shmflg & IPC_CREAT) == 0)
- return ENOENT;
}
- return( shmget_allocate_segment(p, uap, mode, retval));;
+ shmget_ret = shmget_allocate_segment(p, uap, mode, retval);
+shmget_out:
+ SYSV_SHM_SUBSYS_UNLOCK();
+ return shmget_ret;
/*NOTREACHED*/
}
-struct shmsys_args {
- u_int which;
- int a2;
- int a3;
- int a4;
-};
+/*
+ * shmsys
+ *
+ * Entry point for all SHM calls: shmat, oshmctl, shmdt, shmget, shmctl
+ *
+ * Parameters: p Process requesting the call
+ * uap User argument descriptor (see below)
+ * retval Return value of the selected shm call
+ *
+ * Indirect parameters: uap->which msg call to invoke (index in array of shm calls)
+ * uap->a2 User argument descriptor
+ *
+ * Returns: 0 Success
+ * !0 Not success
+ *
+ * Implicit returns: retval Return value of the selected shm call
+ *
+ * DEPRECATED: This interface should not be used to call the other SHM
+ * functions (shmat, oshmctl, shmdt, shmget, shmctl). The correct
+ * usage is to call the other SHM functions directly.
+ */
int
-shmsys(p, uap, retval)
- struct proc *p;
- /* XXX actually varargs. */
- struct shmsys_args *uap;
- register_t *retval;
+shmsys(struct proc *p, struct shmsys_args *uap, int32_t *retval)
{
- if (!shm_inited)
- return(EINVAL);
+ /* The routine that we are dispatching already does this */
if (uap->which >= sizeof(shmcalls)/sizeof(shmcalls[0]))
return EINVAL;
return ((*shmcalls[uap->which])(p, &uap->a2, retval));
}
-void
-shmfork(p1, p2)
- struct proc *p1, *p2;
+/*
+ * Return 0 on success, 1 on failure.
+ */
+int
+shmfork(struct proc *p1, struct proc *p2)
{
struct shmmap_state *shmmap_s;
size_t size;
int i;
+ int shmfork_ret = 0;
+
+ SYSV_SHM_SUBSYS_LOCK();
- if (!shm_inited)
- return;
+ if (!shm_inited) {
+ shminit(NULL);
+ }
+
size = shminfo.shmseg * sizeof(struct shmmap_state);
- shmmap_s = (struct shmmap_state *)_MALLOC(size, M_SHM, M_WAITOK);
- bcopy((caddr_t)p1->vm_shm, (caddr_t)shmmap_s, size);
- p2->vm_shm = (caddr_t)shmmap_s;
+ MALLOC(shmmap_s, struct shmmap_state *, size, M_SHM, M_WAITOK);
+ if (shmmap_s != NULL) {
+ bcopy((caddr_t)p1->vm_shm, (caddr_t)shmmap_s, size);
+ p2->vm_shm = (caddr_t)shmmap_s;
+ for (i = 0; i < shminfo.shmseg; i++, shmmap_s++)
+ if (shmmap_s->shmid != -1)
+ shmsegs[IPCID_TO_IX(shmmap_s->shmid)].u.shm_nattch++;
+ shmfork_ret = 0;
+ goto shmfork_out;
+ }
+
+ shmfork_ret = 1; /* failed to copy to child - ENOMEM */
+shmfork_out:
+ SYSV_SHM_SUBSYS_UNLOCK();
+ return shmfork_ret;
+}
+
+void
+shmexit(struct proc *p)
+{
+ struct shmmap_state *shmmap_s;
+ int i;
+
+ shmmap_s = (struct shmmap_state *)p->vm_shm;
+
+ SYSV_SHM_SUBSYS_LOCK();
for (i = 0; i < shminfo.shmseg; i++, shmmap_s++)
if (shmmap_s->shmid != -1)
- shmsegs[IPCID_TO_IX(shmmap_s->shmid)].shm_nattch++;
+ /*
+ * XXX: Should the MAC framework enforce
+ * check here as well.
+ */
+ shm_delete_mapping(p, shmmap_s, 1);
+ FREE((caddr_t)p->vm_shm, M_SHM);
+ p->vm_shm = NULL;
+ SYSV_SHM_SUBSYS_UNLOCK();
}
-void
-shmexit(p)
- struct proc *p;
+/*
+ * shmexec() is like shmexit(), only it doesn't delete the mappings,
+ * since the old address space has already been destroyed and the new
+ * one instantiated. Instead, it just does the housekeeping work we
+ * need to do to keep the System V shared memory subsystem sane.
+ */
+__private_extern__ void
+shmexec(struct proc *p)
{
struct shmmap_state *shmmap_s;
int i;
shmmap_s = (struct shmmap_state *)p->vm_shm;
+ SYSV_SHM_SUBSYS_LOCK();
for (i = 0; i < shminfo.shmseg; i++, shmmap_s++)
if (shmmap_s->shmid != -1)
- shm_delete_mapping(p, shmmap_s);
+ shm_delete_mapping(p, shmmap_s, 0);
FREE((caddr_t)p->vm_shm, M_SHM);
p->vm_shm = NULL;
+ SYSV_SHM_SUBSYS_UNLOCK();
}
void
-shminit(dummy)
- void *dummy;
+shminit(__unused void *dummy)
{
int i;
int s;
if (!shm_inited) {
- s = sizeof(struct shmid_ds) * shminfo.shmmni;
+ /*
+ * we store internally 64 bit, since if we didn't, we would
+ * be unable to represent a segment size in excess of 32 bits
+ * with the (struct shmid_ds)->shm_segsz field; also, POSIX
+ * dictates this filed be a size_t, which is 64 bits when
+ * running 64 bit binaries.
+ */
+ s = sizeof(struct shmid_kernel) * shminfo.shmmni;
- MALLOC(shmsegs, struct shmid_ds *, s,
- M_SHM, M_WAITOK);
+ MALLOC(shmsegs, struct shmid_kernel *, s, M_SHM, M_WAITOK);
+ if (shmsegs == NULL) {
+ /* XXX fail safely: leave shared memory uninited */
+ return;
+ }
for (i = 0; i < shminfo.shmmni; i++) {
- shmsegs[i].shm_perm.mode = SHMSEG_FREE;
- shmsegs[i].shm_perm.seq = 0;
+ shmsegs[i].u.shm_perm.mode = SHMSEG_FREE;
+ shmsegs[i].u.shm_perm._seq = 0;
+#if CONFIG_MACF
+ mac_sysvshm_label_init(&shmsegs[i]);
+#endif
}
shm_last_free = 0;
shm_nused = 0;
shm_inited = 1;
}
}
+/* Initialize the mutex governing access to the SysV shm subsystem */
+__private_extern__ void
+sysv_shm_lock_init( void )
+{
+
+ sysv_shm_subsys_lck_grp_attr = lck_grp_attr_alloc_init();
+
+ sysv_shm_subsys_lck_grp = lck_grp_alloc_init("sysv_shm_subsys_lock", sysv_shm_subsys_lck_grp_attr);
+
+ sysv_shm_subsys_lck_attr = lck_attr_alloc_init();
+ lck_mtx_init(&sysv_shm_subsys_mutex, sysv_shm_subsys_lck_grp, sysv_shm_subsys_lck_attr);
+}
/* (struct sysctl_oid *oidp, void *arg1, int arg2, \
struct sysctl_req *req) */
static int
-sysctl_shminfo SYSCTL_HANDLER_ARGS
+sysctl_shminfo(__unused struct sysctl_oid *oidp, void *arg1,
+ __unused int arg2, struct sysctl_req *req)
{
int error = 0;
+ int sysctl_shminfo_ret = 0;
+ uint64_t saved_shmmax;
- error = SYSCTL_OUT(req, arg1, sizeof(int));
- if (error || !req->newptr)
+ error = SYSCTL_OUT(req, arg1, sizeof(int64_t));
+ if (error || req->newptr == USER_ADDR_NULL)
return(error);
- /* Set the values only if shared memory is not initialised */
+ SYSV_SHM_SUBSYS_LOCK();
+
+ /* shmmni can not be changed after SysV SHM has been initialized */
+ if (shm_inited && arg1 == &shminfo.shmmni) {
+ sysctl_shminfo_ret = EPERM;
+ goto sysctl_shminfo_out;
+ }
+ saved_shmmax = shminfo.shmmax;
+
+ if ((error = SYSCTL_IN(req, arg1, sizeof(int64_t))) != 0) {
+ sysctl_shminfo_ret = error;
+ goto sysctl_shminfo_out;
+ }
+
+ if (arg1 == &shminfo.shmmax) {
+ /* shmmax needs to be page-aligned */
+ if (shminfo.shmmax & PAGE_MASK_64) {
+ shminfo.shmmax = saved_shmmax;
+ sysctl_shminfo_ret = EINVAL;
+ goto sysctl_shminfo_out;
+ }
+ }
+ sysctl_shminfo_ret = 0;
+sysctl_shminfo_out:
+ SYSV_SHM_SUBSYS_UNLOCK();
+ return sysctl_shminfo_ret;
+}
+
+static int
+IPCS_shm_sysctl(__unused struct sysctl_oid *oidp, __unused void *arg1,
+ __unused int arg2, struct sysctl_req *req)
+{
+ int error;
+ int cursor;
+ union {
+ struct user32_IPCS_command u32;
+ struct user_IPCS_command u64;
+ } ipcs;
+ struct user32_shmid_ds shmid_ds32; /* post conversion, 32 bit version */
+ struct user_shmid_ds shmid_ds; /* 64 bit version */
+ void *shmid_dsp;
+ size_t ipcs_sz = sizeof(struct user_IPCS_command);
+ size_t shmid_ds_sz = sizeof(struct user_shmid_ds);
+ struct proc *p = current_proc();
+
+ SYSV_SHM_SUBSYS_LOCK();
+
if (!shm_inited) {
- if (error = SYSCTL_IN(req, arg1, sizeof(int)))
- return(error);
- if (arg1 == &shminfo.shmmax) {
- if (shminfo.shmmax & PAGE_MASK) {
- shminfo.shmmax = -1;
- return(EINVAL);
+ shminit(NULL);
+ }
+
+ if (!IS_64BIT_PROCESS(p)) {
+ ipcs_sz = sizeof(struct user32_IPCS_command);
+ shmid_ds_sz = sizeof(struct user32_shmid_ds);
+ }
+
+ /* Copy in the command structure */
+ if ((error = SYSCTL_IN(req, &ipcs, ipcs_sz)) != 0) {
+ goto ipcs_shm_sysctl_out;
+ }
+
+ if (!IS_64BIT_PROCESS(p)) /* convert in place */
+ ipcs.u64.ipcs_data = CAST_USER_ADDR_T(ipcs.u32.ipcs_data);
+
+ /* Let us version this interface... */
+ if (ipcs.u64.ipcs_magic != IPCS_MAGIC) {
+ error = EINVAL;
+ goto ipcs_shm_sysctl_out;
+ }
+
+ switch(ipcs.u64.ipcs_op) {
+ case IPCS_SHM_CONF: /* Obtain global configuration data */
+ if (ipcs.u64.ipcs_datalen != sizeof(struct shminfo)) {
+ if (ipcs.u64.ipcs_cursor != 0) { /* fwd. compat. */
+ error = ENOMEM;
+ break;
}
+ error = ERANGE;
+ break;
}
+ error = copyout(&shminfo, ipcs.u64.ipcs_data, ipcs.u64.ipcs_datalen);
+ break;
- /* Initialize only when all values are set */
- if ((shminfo.shmmax != -1) &&
- (shminfo.shmmin != -1) &&
- (shminfo.shmmni != -1) &&
- (shminfo.shmseg != -1) &&
- (shminfo.shmall != -1)) {
- shminit();
+ case IPCS_SHM_ITER: /* Iterate over existing segments */
+ cursor = ipcs.u64.ipcs_cursor;
+ if (cursor < 0 || cursor >= shminfo.shmmni) {
+ error = ERANGE;
+ break;
+ }
+ if (ipcs.u64.ipcs_datalen != (int)shmid_ds_sz) {
+ error = EINVAL;
+ break;
}
+ for( ; cursor < shminfo.shmmni; cursor++) {
+ if (shmsegs[cursor].u.shm_perm.mode & SHMSEG_ALLOCATED)
+ break;
+ continue;
+ }
+ if (cursor == shminfo.shmmni) {
+ error = ENOENT;
+ break;
+ }
+
+ shmid_dsp = &shmsegs[cursor]; /* default: 64 bit */
+
+ /*
+ * If necessary, convert the 64 bit kernel segment
+ * descriptor to a 32 bit user one.
+ */
+ if (!IS_64BIT_PROCESS(p)) {
+ shmid_ds_64to32(shmid_dsp, &shmid_ds32);
+
+ /* Clear kernel reserved pointer before copying to user space */
+ shmid_ds32.shm_internal = (user32_addr_t)0;
+
+ shmid_dsp = &shmid_ds32;
+ } else {
+ memcpy(&shmid_ds, shmid_dsp, sizeof(shmid_ds));
+
+ /* Clear kernel reserved pointer before copying to user space */
+ shmid_ds.shm_internal = USER_ADDR_NULL;
+
+ shmid_dsp = &shmid_ds;
+ }
+ error = copyout(shmid_dsp, ipcs.u64.ipcs_data, ipcs.u64.ipcs_datalen);
+ if (!error) {
+ /* update cursor */
+ ipcs.u64.ipcs_cursor = cursor + 1;
+
+ if (!IS_64BIT_PROCESS(p)) /* convert in place */
+ ipcs.u32.ipcs_data = CAST_DOWN_EXPLICIT(user32_addr_t,ipcs.u64.ipcs_data);
+
+ error = SYSCTL_OUT(req, &ipcs, ipcs_sz);
+ }
+ break;
+
+ default:
+ error = EINVAL;
+ break;
}
- return(0);
+ipcs_shm_sysctl_out:
+ SYSV_SHM_SUBSYS_UNLOCK();
+ return(error);
}
-SYSCTL_NODE(_kern, KERN_SYSV, sysv, CTLFLAG_RW, 0, "SYSV");
+SYSCTL_NODE(_kern, KERN_SYSV, sysv, CTLFLAG_RW | CTLFLAG_LOCKED | CTLFLAG_ANYBODY, 0, "SYSV");
+
+SYSCTL_PROC(_kern_sysv, OID_AUTO, shmmax, CTLTYPE_QUAD | CTLFLAG_RW | CTLFLAG_LOCKED,
+ &shminfo.shmmax, 0, &sysctl_shminfo ,"Q","shmmax");
-SYSCTL_PROC(_kern_sysv, KSYSV_SHMMAX, shmmax, CTLTYPE_INT | CTLFLAG_RW,
- &shminfo.shmmax, 0, &sysctl_shminfo ,"I","shmmax");
+SYSCTL_PROC(_kern_sysv, OID_AUTO, shmmin, CTLTYPE_QUAD | CTLFLAG_RW | CTLFLAG_LOCKED,
+ &shminfo.shmmin, 0, &sysctl_shminfo ,"Q","shmmin");
-SYSCTL_PROC(_kern_sysv, KSYSV_SHMMIN, shmmin, CTLTYPE_INT | CTLFLAG_RW,
- &shminfo.shmmin, 0, &sysctl_shminfo ,"I","shmmin");
+SYSCTL_PROC(_kern_sysv, OID_AUTO, shmmni, CTLTYPE_QUAD | CTLFLAG_RW | CTLFLAG_LOCKED,
+ &shminfo.shmmni, 0, &sysctl_shminfo ,"Q","shmmni");
-SYSCTL_PROC(_kern_sysv, KSYSV_SHMMNI, shmmni, CTLTYPE_INT | CTLFLAG_RW,
- &shminfo.shmmni, 0, &sysctl_shminfo ,"I","shmmni");
+SYSCTL_PROC(_kern_sysv, OID_AUTO, shmseg, CTLTYPE_QUAD | CTLFLAG_RW | CTLFLAG_LOCKED,
+ &shminfo.shmseg, 0, &sysctl_shminfo ,"Q","shmseg");
-SYSCTL_PROC(_kern_sysv, KSYSV_SHMSEG, shmseg, CTLTYPE_INT | CTLFLAG_RW,
- &shminfo.shmseg, 0, &sysctl_shminfo ,"I","shmseg");
+SYSCTL_PROC(_kern_sysv, OID_AUTO, shmall, CTLTYPE_QUAD | CTLFLAG_RW | CTLFLAG_LOCKED,
+ &shminfo.shmall, 0, &sysctl_shminfo ,"Q","shmall");
-SYSCTL_PROC(_kern_sysv, KSYSV_SHMALL, shmall, CTLTYPE_INT | CTLFLAG_RW,
- &shminfo.shmall, 0, &sysctl_shminfo ,"I","shmall");
+SYSCTL_NODE(_kern_sysv, OID_AUTO, ipcs, CTLFLAG_RW | CTLFLAG_LOCKED | CTLFLAG_ANYBODY, 0, "SYSVIPCS");
+SYSCTL_PROC(_kern_sysv_ipcs, OID_AUTO, shm, CTLFLAG_RW | CTLFLAG_ANYBODY | CTLFLAG_LOCKED,
+ 0, 0, IPCS_shm_sysctl,
+ "S,IPCS_shm_command",
+ "ipcs shm command interface");
+#endif /* SYSV_SHM */
+/* DSEP Review Done pl-20051108-v02 @2743,@2908,@2913,@3009 */
projects / apple / xnu.git / blobdiff