3 * Copyright (C) 1992 Krishna Balasubramanian
5 * Sep 1997 - Call suser() last after "normal" permission checks so we
6 * get BSD style process accounting right.
7 * Occurs in several places in the IPC code.
8 * Chris Evans, <chris@ferret.lmh.ox.ac.uk>
9 * Nov 1999 - ipc helper functions, unified SMP locking
10 * Manfred Spraul <manfred@colorfullife.com>
11 * Oct 2002 - One lock per IPC id. RCU ipc_free for lock-free grow_ary().
12 * Mingming Cao <cmm@us.ibm.com>
13 * Mar 2006 - support for audit of ipc object properties
14 * Dustin Kirkland <dustin.kirkland@us.ibm.com>
15 * Jun 2006 - namespaces ssupport
17 * Pavel Emelianov <xemul@openvz.org>
19 * General sysv ipc locking scheme:
21 * obtain the ipc object (kern_ipc_perm) by looking up the id in an idr
23 * - perform initial checks (capabilities, auditing and permission,
25 * - perform read-only operations, such as STAT, INFO commands.
26 * acquire the ipc lock (kern_ipc_perm.lock) through
28 * - perform data updates, such as SET, RMID commands and
29 * mechanism-specific operations (semop/semtimedop,
30 * msgsnd/msgrcv, shmat/shmdt).
31 * drop the ipc lock, through ipc_unlock_object().
34 * The ids->rwsem must be taken when:
35 * - creating, removing and iterating the existing entries in ipc
37 * - iterating through files under /proc/sysvipc/
39 * Note that sems have a special fast path that avoids kern_ipc_perm.lock -
44 #include <linux/shm.h>
45 #include <linux/init.h>
46 #include <linux/msg.h>
47 #include <linux/vmalloc.h>
48 #include <linux/slab.h>
49 #include <linux/notifier.h>
50 #include <linux/capability.h>
51 #include <linux/highuid.h>
52 #include <linux/security.h>
53 #include <linux/rcupdate.h>
54 #include <linux/workqueue.h>
55 #include <linux/seq_file.h>
56 #include <linux/proc_fs.h>
57 #include <linux/audit.h>
58 #include <linux/nsproxy.h>
59 #include <linux/rwsem.h>
60 #include <linux/memory.h>
61 #include <linux/ipc_namespace.h>
63 #include <asm/unistd.h>
67 struct ipc_proc_iface
{
71 int (*show
)(struct seq_file
*, void *);
74 static void ipc_memory_notifier(struct work_struct
*work
)
76 ipcns_notify(IPCNS_MEMCHANGED
);
79 static int ipc_memory_callback(struct notifier_block
*self
,
80 unsigned long action
, void *arg
)
82 static DECLARE_WORK(ipc_memory_wq
, ipc_memory_notifier
);
85 case MEM_ONLINE
: /* memory successfully brought online */
86 case MEM_OFFLINE
: /* or offline: it's time to recompute msgmni */
88 * This is done by invoking the ipcns notifier chain with the
89 * IPC_MEMCHANGED event.
90 * In order not to keep the lock on the hotplug memory chain
91 * for too long, queue a work item that will, when waken up,
92 * activate the ipcns notification chain.
94 schedule_work(&ipc_memory_wq
);
96 case MEM_GOING_ONLINE
:
97 case MEM_GOING_OFFLINE
:
98 case MEM_CANCEL_ONLINE
:
99 case MEM_CANCEL_OFFLINE
:
107 static struct notifier_block ipc_memory_nb
= {
108 .notifier_call
= ipc_memory_callback
,
109 .priority
= IPC_CALLBACK_PRI
,
113 * ipc_init - initialise ipc subsystem
115 * The various sysv ipc resources (semaphores, messages and shared
116 * memory) are initialised.
118 * A callback routine is registered into the memory hotplug notifier
119 * chain: since msgmni scales to lowmem this callback routine will be
120 * called upon successful memory add / remove to recompute msmgni.
122 static int __init
ipc_init(void)
127 register_hotmemory_notifier(&ipc_memory_nb
);
128 register_ipcns_notifier(&init_ipc_ns
);
131 __initcall(ipc_init
);
134 * ipc_init_ids - initialise ipc identifiers
135 * @ids: ipc identifier set
137 * Set up the sequence range to use for the ipc identifier range (limited
138 * below IPCMNI) then initialise the ids idr.
140 void ipc_init_ids(struct ipc_ids
*ids
)
142 init_rwsem(&ids
->rwsem
);
148 int seq_limit
= INT_MAX
/SEQ_MULTIPLIER
;
149 if (seq_limit
> USHRT_MAX
)
150 ids
->seq_max
= USHRT_MAX
;
152 ids
->seq_max
= seq_limit
;
155 idr_init(&ids
->ipcs_idr
);
158 #ifdef CONFIG_PROC_FS
159 static const struct file_operations sysvipc_proc_fops
;
161 * ipc_init_proc_interface - create a proc interface for sysipc types using a seq_file interface.
162 * @path: Path in procfs
163 * @header: Banner to be printed at the beginning of the file.
164 * @ids: ipc id table to iterate.
165 * @show: show routine.
167 void __init
ipc_init_proc_interface(const char *path
, const char *header
,
168 int ids
, int (*show
)(struct seq_file
*, void *))
170 struct proc_dir_entry
*pde
;
171 struct ipc_proc_iface
*iface
;
173 iface
= kmalloc(sizeof(*iface
), GFP_KERNEL
);
177 iface
->header
= header
;
181 pde
= proc_create_data(path
,
182 S_IRUGO
, /* world readable */
183 NULL
, /* parent dir */
192 * ipc_findkey - find a key in an ipc identifier set
193 * @ids: ipc identifier set
196 * Returns the locked pointer to the ipc structure if found or NULL
197 * otherwise. If key is found ipc points to the owning ipc structure
199 * Called with ipc_ids.rwsem held.
201 static struct kern_ipc_perm
*ipc_findkey(struct ipc_ids
*ids
, key_t key
)
203 struct kern_ipc_perm
*ipc
;
207 for (total
= 0, next_id
= 0; total
< ids
->in_use
; next_id
++) {
208 ipc
= idr_find(&ids
->ipcs_idr
, next_id
);
213 if (ipc
->key
!= key
) {
219 ipc_lock_object(ipc
);
227 * ipc_get_maxid - get the last assigned id
228 * @ids: ipc identifier set
230 * Called with ipc_ids.rwsem held.
232 int ipc_get_maxid(struct ipc_ids
*ids
)
234 struct kern_ipc_perm
*ipc
;
238 if (ids
->in_use
== 0)
241 if (ids
->in_use
== IPCMNI
)
244 /* Look for the last assigned id */
246 for (id
= 0; id
< IPCMNI
&& total
< ids
->in_use
; id
++) {
247 ipc
= idr_find(&ids
->ipcs_idr
, id
);
257 * ipc_addid - add an ipc identifier
258 * @ids: ipc identifier set
259 * @new: new ipc permission set
260 * @size: limit for the number of used ids
262 * Add an entry 'new' to the ipc ids idr. The permissions object is
263 * initialised and the first free entry is set up and the id assigned
264 * is returned. The 'new' entry is returned in a locked state on success.
265 * On failure the entry is not locked and a negative err-code is returned.
267 * Called with writer ipc_ids.rwsem held.
269 int ipc_addid(struct ipc_ids
*ids
, struct kern_ipc_perm
*new, int size
)
274 int next_id
= ids
->next_id
;
279 if (ids
->in_use
>= size
)
282 idr_preload(GFP_KERNEL
);
284 spin_lock_init(&new->lock
);
285 new->deleted
= false;
287 spin_lock(&new->lock
);
289 id
= idr_alloc(&ids
->ipcs_idr
, new,
290 (next_id
< 0) ? 0 : ipcid_to_idx(next_id
), 0,
294 spin_unlock(&new->lock
);
301 current_euid_egid(&euid
, &egid
);
302 new->cuid
= new->uid
= euid
;
303 new->gid
= new->cgid
= egid
;
306 new->seq
= ids
->seq
++;
307 if (ids
->seq
> ids
->seq_max
)
310 new->seq
= ipcid_to_seqx(next_id
);
314 new->id
= ipc_buildid(id
, new->seq
);
319 * ipcget_new - create a new ipc object
321 * @ids: ipc identifer set
322 * @ops: the actual creation routine to call
323 * @params: its parameters
325 * This routine is called by sys_msgget, sys_semget() and sys_shmget()
326 * when the key is IPC_PRIVATE.
328 static int ipcget_new(struct ipc_namespace
*ns
, struct ipc_ids
*ids
,
329 struct ipc_ops
*ops
, struct ipc_params
*params
)
333 down_write(&ids
->rwsem
);
334 err
= ops
->getnew(ns
, params
);
335 up_write(&ids
->rwsem
);
340 * ipc_check_perms - check security and permissions for an ipc object
342 * @ipcp: ipc permission set
343 * @ops: the actual security routine to call
344 * @params: its parameters
346 * This routine is called by sys_msgget(), sys_semget() and sys_shmget()
347 * when the key is not IPC_PRIVATE and that key already exists in the
350 * On success, the ipc id is returned.
352 * It is called with ipc_ids.rwsem and ipcp->lock held.
354 static int ipc_check_perms(struct ipc_namespace
*ns
,
355 struct kern_ipc_perm
*ipcp
,
357 struct ipc_params
*params
)
361 if (ipcperms(ns
, ipcp
, params
->flg
))
364 err
= ops
->associate(ipcp
, params
->flg
);
373 * ipcget_public - get an ipc object or create a new one
375 * @ids: ipc identifer set
376 * @ops: the actual creation routine to call
377 * @params: its parameters
379 * This routine is called by sys_msgget, sys_semget() and sys_shmget()
380 * when the key is not IPC_PRIVATE.
381 * It adds a new entry if the key is not found and does some permission
382 * / security checkings if the key is found.
384 * On success, the ipc id is returned.
386 static int ipcget_public(struct ipc_namespace
*ns
, struct ipc_ids
*ids
,
387 struct ipc_ops
*ops
, struct ipc_params
*params
)
389 struct kern_ipc_perm
*ipcp
;
390 int flg
= params
->flg
;
394 * Take the lock as a writer since we are potentially going to add
395 * a new entry + read locks are not "upgradable"
397 down_write(&ids
->rwsem
);
398 ipcp
= ipc_findkey(ids
, params
->key
);
401 if (!(flg
& IPC_CREAT
))
404 err
= ops
->getnew(ns
, params
);
406 /* ipc object has been locked by ipc_findkey() */
408 if (flg
& IPC_CREAT
&& flg
& IPC_EXCL
)
412 if (ops
->more_checks
)
413 err
= ops
->more_checks(ipcp
, params
);
416 * ipc_check_perms returns the IPC id on
419 err
= ipc_check_perms(ns
, ipcp
, ops
, params
);
423 up_write(&ids
->rwsem
);
430 * ipc_rmid - remove an ipc identifier
431 * @ids: ipc identifier set
432 * @ipcp: ipc perm structure containing the identifier to remove
434 * ipc_ids.rwsem (as a writer) and the spinlock for this ID are held
435 * before this function is called, and remain locked on the exit.
437 void ipc_rmid(struct ipc_ids
*ids
, struct kern_ipc_perm
*ipcp
)
439 int lid
= ipcid_to_idx(ipcp
->id
);
441 idr_remove(&ids
->ipcs_idr
, lid
);
443 ipcp
->deleted
= true;
447 * ipc_alloc - allocate ipc space
448 * @size: size desired
450 * Allocate memory from the appropriate pools and return a pointer to it.
451 * NULL is returned if the allocation fails
453 void *ipc_alloc(int size
)
456 if (size
> PAGE_SIZE
)
459 out
= kmalloc(size
, GFP_KERNEL
);
464 * ipc_free - free ipc space
465 * @ptr: pointer returned by ipc_alloc
466 * @size: size of block
468 * Free a block created with ipc_alloc(). The caller must know the size
469 * used in the allocation call.
471 void ipc_free(void *ptr
, int size
)
473 if (size
> PAGE_SIZE
)
480 * ipc_rcu_alloc - allocate ipc and rcu space
481 * @size: size desired
483 * Allocate memory for the rcu header structure + the object.
484 * Returns the pointer to the object or NULL upon failure.
486 void *ipc_rcu_alloc(int size
)
489 * We prepend the allocation with the rcu struct
491 struct ipc_rcu
*out
= ipc_alloc(sizeof(struct ipc_rcu
) + size
);
494 atomic_set(&out
->refcount
, 1);
498 int ipc_rcu_getref(void *ptr
)
500 struct ipc_rcu
*p
= ((struct ipc_rcu
*)ptr
) - 1;
502 return atomic_inc_not_zero(&p
->refcount
);
505 void ipc_rcu_putref(void *ptr
, void (*func
)(struct rcu_head
*head
))
507 struct ipc_rcu
*p
= ((struct ipc_rcu
*)ptr
) - 1;
509 if (!atomic_dec_and_test(&p
->refcount
))
512 call_rcu(&p
->rcu
, func
);
515 void ipc_rcu_free(struct rcu_head
*head
)
517 struct ipc_rcu
*p
= container_of(head
, struct ipc_rcu
, rcu
);
519 if (is_vmalloc_addr(p
))
526 * ipcperms - check ipc permissions
528 * @ipcp: ipc permission set
529 * @flag: desired permission set
531 * Check user, group, other permissions for access
532 * to ipc resources. return 0 if allowed
534 * @flag will most probably be 0 or S_...UGO from <linux/stat.h>
536 int ipcperms(struct ipc_namespace
*ns
, struct kern_ipc_perm
*ipcp
, short flag
)
538 kuid_t euid
= current_euid();
539 int requested_mode
, granted_mode
;
542 requested_mode
= (flag
>> 6) | (flag
>> 3) | flag
;
543 granted_mode
= ipcp
->mode
;
544 if (uid_eq(euid
, ipcp
->cuid
) ||
545 uid_eq(euid
, ipcp
->uid
))
547 else if (in_group_p(ipcp
->cgid
) || in_group_p(ipcp
->gid
))
549 /* is there some bit set in requested_mode but not in granted_mode? */
550 if ((requested_mode
& ~granted_mode
& 0007) &&
551 !ns_capable(ns
->user_ns
, CAP_IPC_OWNER
))
554 return security_ipc_permission(ipcp
, flag
);
558 * Functions to convert between the kern_ipc_perm structure and the
559 * old/new ipc_perm structures
563 * kernel_to_ipc64_perm - convert kernel ipc permissions to user
564 * @in: kernel permissions
565 * @out: new style ipc permissions
567 * Turn the kernel object @in into a set of permissions descriptions
568 * for returning to userspace (@out).
570 void kernel_to_ipc64_perm(struct kern_ipc_perm
*in
, struct ipc64_perm
*out
)
573 out
->uid
= from_kuid_munged(current_user_ns(), in
->uid
);
574 out
->gid
= from_kgid_munged(current_user_ns(), in
->gid
);
575 out
->cuid
= from_kuid_munged(current_user_ns(), in
->cuid
);
576 out
->cgid
= from_kgid_munged(current_user_ns(), in
->cgid
);
577 out
->mode
= in
->mode
;
582 * ipc64_perm_to_ipc_perm - convert new ipc permissions to old
583 * @in: new style ipc permissions
584 * @out: old style ipc permissions
586 * Turn the new style permissions object @in into a compatibility
587 * object and store it into the @out pointer.
589 void ipc64_perm_to_ipc_perm(struct ipc64_perm
*in
, struct ipc_perm
*out
)
592 SET_UID(out
->uid
, in
->uid
);
593 SET_GID(out
->gid
, in
->gid
);
594 SET_UID(out
->cuid
, in
->cuid
);
595 SET_GID(out
->cgid
, in
->cgid
);
596 out
->mode
= in
->mode
;
602 * @ids: ipc identifier set
603 * @id: ipc id to look for
605 * Look for an id in the ipc ids idr and return associated ipc object.
607 * Call inside the RCU critical section.
608 * The ipc object is *not* locked on exit.
610 struct kern_ipc_perm
*ipc_obtain_object(struct ipc_ids
*ids
, int id
)
612 struct kern_ipc_perm
*out
;
613 int lid
= ipcid_to_idx(id
);
615 out
= idr_find(&ids
->ipcs_idr
, lid
);
617 return ERR_PTR(-EINVAL
);
623 * ipc_lock - lock an ipc structure without rwsem held
624 * @ids: ipc identifier set
625 * @id: ipc id to look for
627 * Look for an id in the ipc ids idr and lock the associated ipc object.
629 * The ipc object is locked on successful exit.
631 struct kern_ipc_perm
*ipc_lock(struct ipc_ids
*ids
, int id
)
633 struct kern_ipc_perm
*out
;
636 out
= ipc_obtain_object(ids
, id
);
640 spin_lock(&out
->lock
);
642 /* ipc_rmid() may have already freed the ID while ipc_lock
643 * was spinning: here verify that the structure is still valid
645 if (ipc_valid_object(out
))
648 spin_unlock(&out
->lock
);
649 out
= ERR_PTR(-EINVAL
);
656 * ipc_obtain_object_check
657 * @ids: ipc identifier set
658 * @id: ipc id to look for
660 * Similar to ipc_obtain_object() but also checks
661 * the ipc object reference counter.
663 * Call inside the RCU critical section.
664 * The ipc object is *not* locked on exit.
666 struct kern_ipc_perm
*ipc_obtain_object_check(struct ipc_ids
*ids
, int id
)
668 struct kern_ipc_perm
*out
= ipc_obtain_object(ids
, id
);
673 if (ipc_checkid(out
, id
))
674 return ERR_PTR(-EIDRM
);
680 * ipcget - Common sys_*get() code
682 * @ids: ipc identifier set
683 * @ops: operations to be called on ipc object creation, permission checks
685 * @params: the parameters needed by the previous operations.
687 * Common routine called by sys_msgget(), sys_semget() and sys_shmget().
689 int ipcget(struct ipc_namespace
*ns
, struct ipc_ids
*ids
,
690 struct ipc_ops
*ops
, struct ipc_params
*params
)
692 if (params
->key
== IPC_PRIVATE
)
693 return ipcget_new(ns
, ids
, ops
, params
);
695 return ipcget_public(ns
, ids
, ops
, params
);
699 * ipc_update_perm - update the permissions of an ipc object
700 * @in: the permission given as input.
701 * @out: the permission of the ipc to set.
703 int ipc_update_perm(struct ipc64_perm
*in
, struct kern_ipc_perm
*out
)
705 kuid_t uid
= make_kuid(current_user_ns(), in
->uid
);
706 kgid_t gid
= make_kgid(current_user_ns(), in
->gid
);
707 if (!uid_valid(uid
) || !gid_valid(gid
))
712 out
->mode
= (out
->mode
& ~S_IRWXUGO
)
713 | (in
->mode
& S_IRWXUGO
);
719 * ipcctl_pre_down_nolock - retrieve an ipc and check permissions for some IPC_XXX cmd
721 * @ids: the table of ids where to look for the ipc
722 * @id: the id of the ipc to retrieve
723 * @cmd: the cmd to check
724 * @perm: the permission to set
725 * @extra_perm: one extra permission parameter used by msq
727 * This function does some common audit and permissions check for some IPC_XXX
728 * cmd and is called from semctl_down, shmctl_down and msgctl_down.
729 * It must be called without any lock held and
730 * - retrieves the ipc with the given id in the given table.
731 * - performs some audit and permission check, depending on the given cmd
732 * - returns a pointer to the ipc object or otherwise, the corresponding error.
734 * Call holding the both the rwsem and the rcu read lock.
736 struct kern_ipc_perm
*ipcctl_pre_down_nolock(struct ipc_namespace
*ns
,
737 struct ipc_ids
*ids
, int id
, int cmd
,
738 struct ipc64_perm
*perm
, int extra_perm
)
742 struct kern_ipc_perm
*ipcp
;
744 ipcp
= ipc_obtain_object_check(ids
, id
);
752 audit_ipc_set_perm(extra_perm
, perm
->uid
,
753 perm
->gid
, perm
->mode
);
755 euid
= current_euid();
756 if (uid_eq(euid
, ipcp
->cuid
) || uid_eq(euid
, ipcp
->uid
) ||
757 ns_capable(ns
->user_ns
, CAP_SYS_ADMIN
))
758 return ipcp
; /* successful lookup */
763 #ifdef CONFIG_ARCH_WANT_IPC_PARSE_VERSION
767 * ipc_parse_version - ipc call version
768 * @cmd: pointer to command
770 * Return IPC_64 for new style IPC and IPC_OLD for old style IPC.
771 * The @cmd value is turned from an encoding command and version into
772 * just the command code.
774 int ipc_parse_version(int *cmd
)
784 #endif /* CONFIG_ARCH_WANT_IPC_PARSE_VERSION */
786 #ifdef CONFIG_PROC_FS
787 struct ipc_proc_iter
{
788 struct ipc_namespace
*ns
;
789 struct ipc_proc_iface
*iface
;
793 * This routine locks the ipc structure found at least at position pos.
795 static struct kern_ipc_perm
*sysvipc_find_ipc(struct ipc_ids
*ids
, loff_t pos
,
798 struct kern_ipc_perm
*ipc
;
802 for (id
= 0; id
< pos
&& total
< ids
->in_use
; id
++) {
803 ipc
= idr_find(&ids
->ipcs_idr
, id
);
808 if (total
>= ids
->in_use
)
811 for (; pos
< IPCMNI
; pos
++) {
812 ipc
= idr_find(&ids
->ipcs_idr
, pos
);
816 ipc_lock_object(ipc
);
821 /* Out of range - return NULL to terminate iteration */
825 static void *sysvipc_proc_next(struct seq_file
*s
, void *it
, loff_t
*pos
)
827 struct ipc_proc_iter
*iter
= s
->private;
828 struct ipc_proc_iface
*iface
= iter
->iface
;
829 struct kern_ipc_perm
*ipc
= it
;
831 /* If we had an ipc id locked before, unlock it */
832 if (ipc
&& ipc
!= SEQ_START_TOKEN
)
835 return sysvipc_find_ipc(&iter
->ns
->ids
[iface
->ids
], *pos
, pos
);
839 * File positions: pos 0 -> header, pos n -> ipc id = n - 1.
840 * SeqFile iterator: iterator value locked ipc pointer or SEQ_TOKEN_START.
842 static void *sysvipc_proc_start(struct seq_file
*s
, loff_t
*pos
)
844 struct ipc_proc_iter
*iter
= s
->private;
845 struct ipc_proc_iface
*iface
= iter
->iface
;
848 ids
= &iter
->ns
->ids
[iface
->ids
];
851 * Take the lock - this will be released by the corresponding
854 down_read(&ids
->rwsem
);
856 /* pos < 0 is invalid */
860 /* pos == 0 means header */
862 return SEQ_START_TOKEN
;
864 /* Find the (pos-1)th ipc */
865 return sysvipc_find_ipc(ids
, *pos
- 1, pos
);
868 static void sysvipc_proc_stop(struct seq_file
*s
, void *it
)
870 struct kern_ipc_perm
*ipc
= it
;
871 struct ipc_proc_iter
*iter
= s
->private;
872 struct ipc_proc_iface
*iface
= iter
->iface
;
875 /* If we had a locked structure, release it */
876 if (ipc
&& ipc
!= SEQ_START_TOKEN
)
879 ids
= &iter
->ns
->ids
[iface
->ids
];
880 /* Release the lock we took in start() */
881 up_read(&ids
->rwsem
);
884 static int sysvipc_proc_show(struct seq_file
*s
, void *it
)
886 struct ipc_proc_iter
*iter
= s
->private;
887 struct ipc_proc_iface
*iface
= iter
->iface
;
889 if (it
== SEQ_START_TOKEN
)
890 return seq_puts(s
, iface
->header
);
892 return iface
->show(s
, it
);
895 static const struct seq_operations sysvipc_proc_seqops
= {
896 .start
= sysvipc_proc_start
,
897 .stop
= sysvipc_proc_stop
,
898 .next
= sysvipc_proc_next
,
899 .show
= sysvipc_proc_show
,
902 static int sysvipc_proc_open(struct inode
*inode
, struct file
*file
)
905 struct seq_file
*seq
;
906 struct ipc_proc_iter
*iter
;
909 iter
= kmalloc(sizeof(*iter
), GFP_KERNEL
);
913 ret
= seq_open(file
, &sysvipc_proc_seqops
);
917 seq
= file
->private_data
;
920 iter
->iface
= PDE_DATA(inode
);
921 iter
->ns
= get_ipc_ns(current
->nsproxy
->ipc_ns
);
929 static int sysvipc_proc_release(struct inode
*inode
, struct file
*file
)
931 struct seq_file
*seq
= file
->private_data
;
932 struct ipc_proc_iter
*iter
= seq
->private;
933 put_ipc_ns(iter
->ns
);
934 return seq_release_private(inode
, file
);
937 static const struct file_operations sysvipc_proc_fops
= {
938 .open
= sysvipc_proc_open
,
941 .release
= sysvipc_proc_release
,
943 #endif /* CONFIG_PROC_FS */