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>
21 #include <linux/shm.h>
22 #include <linux/init.h>
23 #include <linux/msg.h>
24 #include <linux/vmalloc.h>
25 #include <linux/slab.h>
26 #include <linux/capability.h>
27 #include <linux/highuid.h>
28 #include <linux/security.h>
29 #include <linux/rcupdate.h>
30 #include <linux/workqueue.h>
31 #include <linux/seq_file.h>
32 #include <linux/proc_fs.h>
33 #include <linux/audit.h>
34 #include <linux/nsproxy.h>
35 #include <linux/rwsem.h>
36 #include <linux/memory.h>
37 #include <linux/ipc_namespace.h>
39 #include <asm/unistd.h>
43 struct ipc_proc_iface {
47 int (*show)(struct seq_file *, void *);
50 struct ipc_namespace init_ipc_ns = {
52 .refcount = ATOMIC_INIT(2),
56 atomic_t nr_ipc_ns = ATOMIC_INIT(1);
59 #ifdef CONFIG_MEMORY_HOTPLUG
61 static void ipc_memory_notifier(struct work_struct *work)
63 ipcns_notify(IPCNS_MEMCHANGED);
66 static DECLARE_WORK(ipc_memory_wq, ipc_memory_notifier);
69 static int ipc_memory_callback(struct notifier_block *self,
70 unsigned long action, void *arg)
73 case MEM_ONLINE: /* memory successfully brought online */
74 case MEM_OFFLINE: /* or offline: it's time to recompute msgmni */
76 * This is done by invoking the ipcns notifier chain with the
77 * IPC_MEMCHANGED event.
78 * In order not to keep the lock on the hotplug memory chain
79 * for too long, queue a work item that will, when waken up,
80 * activate the ipcns notification chain.
81 * No need to keep several ipc work items on the queue.
83 if (!work_pending(&ipc_memory_wq))
84 schedule_work(&ipc_memory_wq);
86 case MEM_GOING_ONLINE:
87 case MEM_GOING_OFFLINE:
88 case MEM_CANCEL_ONLINE:
89 case MEM_CANCEL_OFFLINE:
97 #endif /* CONFIG_MEMORY_HOTPLUG */
100 * ipc_init - initialise IPC subsystem
102 * The various system5 IPC resources (semaphores, messages and shared
103 * memory) are initialised
104 * A callback routine is registered into the memory hotplug notifier
105 * chain: since msgmni scales to lowmem this callback routine will be
106 * called upon successful memory add / remove to recompute msmgni.
109 static int __init ipc_init(void)
114 hotplug_memory_notifier(ipc_memory_callback, IPC_CALLBACK_PRI);
115 register_ipcns_notifier(&init_ipc_ns);
118 __initcall(ipc_init);
121 * ipc_init_ids - initialise IPC identifiers
122 * @ids: Identifier set
124 * Set up the sequence range to use for the ipc identifier range (limited
125 * below IPCMNI) then initialise the ids idr.
128 void ipc_init_ids(struct ipc_ids *ids)
130 init_rwsem(&ids->rw_mutex);
135 int seq_limit = INT_MAX/SEQ_MULTIPLIER;
136 if (seq_limit > USHORT_MAX)
137 ids->seq_max = USHORT_MAX;
139 ids->seq_max = seq_limit;
142 idr_init(&ids->ipcs_idr);
145 #ifdef CONFIG_PROC_FS
146 static const struct file_operations sysvipc_proc_fops;
148 * ipc_init_proc_interface - Create a proc interface for sysipc types using a seq_file interface.
149 * @path: Path in procfs
150 * @header: Banner to be printed at the beginning of the file.
151 * @ids: ipc id table to iterate.
152 * @show: show routine.
154 void __init ipc_init_proc_interface(const char *path, const char *header,
155 int ids, int (*show)(struct seq_file *, void *))
157 struct proc_dir_entry *pde;
158 struct ipc_proc_iface *iface;
160 iface = kmalloc(sizeof(*iface), GFP_KERNEL);
164 iface->header = header;
168 pde = create_proc_entry(path,
169 S_IRUGO, /* world readable */
170 NULL /* parent dir */);
173 pde->proc_fops = &sysvipc_proc_fops;
181 * ipc_findkey - find a key in an ipc identifier set
182 * @ids: Identifier set
183 * @key: The key to find
185 * Requires ipc_ids.rw_mutex locked.
186 * Returns the LOCKED pointer to the ipc structure if found or NULL
188 * If key is found ipc points to the owning ipc structure
191 static struct kern_ipc_perm *ipc_findkey(struct ipc_ids *ids, key_t key)
193 struct kern_ipc_perm *ipc;
197 for (total = 0, next_id = 0; total < ids->in_use; next_id++) {
198 ipc = idr_find(&ids->ipcs_idr, next_id);
203 if (ipc->key != key) {
208 ipc_lock_by_ptr(ipc);
216 * ipc_get_maxid - get the last assigned id
217 * @ids: IPC identifier set
219 * Called with ipc_ids.rw_mutex held.
222 int ipc_get_maxid(struct ipc_ids *ids)
224 struct kern_ipc_perm *ipc;
228 if (ids->in_use == 0)
231 if (ids->in_use == IPCMNI)
234 /* Look for the last assigned id */
236 for (id = 0; id < IPCMNI && total < ids->in_use; id++) {
237 ipc = idr_find(&ids->ipcs_idr, id);
247 * ipc_addid - add an IPC identifier
248 * @ids: IPC identifier set
249 * @new: new IPC permission set
250 * @size: limit for the number of used ids
252 * Add an entry 'new' to the IPC ids idr. The permissions object is
253 * initialised and the first free entry is set up and the id assigned
254 * is returned. The 'new' entry is returned in a locked state on success.
255 * On failure the entry is not locked and a negative err-code is returned.
257 * Called with ipc_ids.rw_mutex held as a writer.
260 int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size)
267 if (ids->in_use >= size)
270 err = idr_get_new(&ids->ipcs_idr, new, &id);
276 new->cuid = new->uid = current->euid;
277 new->gid = new->cgid = current->egid;
279 new->seq = ids->seq++;
280 if(ids->seq > ids->seq_max)
283 new->id = ipc_buildid(id, new->seq);
284 spin_lock_init(&new->lock);
287 spin_lock(&new->lock);
292 * ipcget_new - create a new ipc object
294 * @ids: IPC identifer set
295 * @ops: the actual creation routine to call
296 * @params: its parameters
298 * This routine is called by sys_msgget, sys_semget() and sys_shmget()
299 * when the key is IPC_PRIVATE.
301 static int ipcget_new(struct ipc_namespace *ns, struct ipc_ids *ids,
302 struct ipc_ops *ops, struct ipc_params *params)
306 err = idr_pre_get(&ids->ipcs_idr, GFP_KERNEL);
311 down_write(&ids->rw_mutex);
312 err = ops->getnew(ns, params);
313 up_write(&ids->rw_mutex);
322 * ipc_check_perms - check security and permissions for an IPC
323 * @ipcp: ipc permission set
324 * @ops: the actual security routine to call
325 * @params: its parameters
327 * This routine is called by sys_msgget(), sys_semget() and sys_shmget()
328 * when the key is not IPC_PRIVATE and that key already exists in the
331 * On success, the IPC id is returned.
333 * It is called with ipc_ids.rw_mutex and ipcp->lock held.
335 static int ipc_check_perms(struct kern_ipc_perm *ipcp, struct ipc_ops *ops,
336 struct ipc_params *params)
340 if (ipcperms(ipcp, params->flg))
343 err = ops->associate(ipcp, params->flg);
352 * ipcget_public - get an ipc object or create a new one
354 * @ids: IPC identifer set
355 * @ops: the actual creation routine to call
356 * @params: its parameters
358 * This routine is called by sys_msgget, sys_semget() and sys_shmget()
359 * when the key is not IPC_PRIVATE.
360 * It adds a new entry if the key is not found and does some permission
361 * / security checkings if the key is found.
363 * On success, the ipc id is returned.
365 static int ipcget_public(struct ipc_namespace *ns, struct ipc_ids *ids,
366 struct ipc_ops *ops, struct ipc_params *params)
368 struct kern_ipc_perm *ipcp;
369 int flg = params->flg;
372 err = idr_pre_get(&ids->ipcs_idr, GFP_KERNEL);
375 * Take the lock as a writer since we are potentially going to add
376 * a new entry + read locks are not "upgradable"
378 down_write(&ids->rw_mutex);
379 ipcp = ipc_findkey(ids, params->key);
382 if (!(flg & IPC_CREAT))
387 err = ops->getnew(ns, params);
389 /* ipc object has been locked by ipc_findkey() */
391 if (flg & IPC_CREAT && flg & IPC_EXCL)
395 if (ops->more_checks)
396 err = ops->more_checks(ipcp, params);
399 * ipc_check_perms returns the IPC id on
402 err = ipc_check_perms(ipcp, ops, params);
406 up_write(&ids->rw_mutex);
416 * ipc_rmid - remove an IPC identifier
417 * @ids: IPC identifier set
418 * @ipcp: ipc perm structure containing the identifier to remove
420 * ipc_ids.rw_mutex (as a writer) and the spinlock for this ID are held
421 * before this function is called, and remain locked on the exit.
424 void ipc_rmid(struct ipc_ids *ids, struct kern_ipc_perm *ipcp)
426 int lid = ipcid_to_idx(ipcp->id);
428 idr_remove(&ids->ipcs_idr, lid);
438 * ipc_alloc - allocate ipc space
439 * @size: size desired
441 * Allocate memory from the appropriate pools and return a pointer to it.
442 * NULL is returned if the allocation fails
445 void* ipc_alloc(int size)
451 out = kmalloc(size, GFP_KERNEL);
456 * ipc_free - free ipc space
457 * @ptr: pointer returned by ipc_alloc
458 * @size: size of block
460 * Free a block created with ipc_alloc(). The caller must know the size
461 * used in the allocation call.
464 void ipc_free(void* ptr, int size)
474 * There are three headers that are prepended to the actual allocation:
475 * - during use: ipc_rcu_hdr.
476 * - during the rcu grace period: ipc_rcu_grace.
477 * - [only if vmalloc]: ipc_rcu_sched.
478 * Their lifetime doesn't overlap, thus the headers share the same memory.
479 * Unlike a normal union, they are right-aligned, thus some container_of
480 * forward/backward casting is necessary:
493 /* "void *" makes sure alignment of following data is sane. */
499 struct work_struct work;
500 /* "void *" makes sure alignment of following data is sane. */
504 #define HDRLEN_KMALLOC (sizeof(struct ipc_rcu_grace) > sizeof(struct ipc_rcu_hdr) ? \
505 sizeof(struct ipc_rcu_grace) : sizeof(struct ipc_rcu_hdr))
506 #define HDRLEN_VMALLOC (sizeof(struct ipc_rcu_sched) > HDRLEN_KMALLOC ? \
507 sizeof(struct ipc_rcu_sched) : HDRLEN_KMALLOC)
509 static inline int rcu_use_vmalloc(int size)
511 /* Too big for a single page? */
512 if (HDRLEN_KMALLOC + size > PAGE_SIZE)
518 * ipc_rcu_alloc - allocate ipc and rcu space
519 * @size: size desired
521 * Allocate memory for the rcu header structure + the object.
522 * Returns the pointer to the object.
523 * NULL is returned if the allocation fails.
526 void* ipc_rcu_alloc(int size)
530 * We prepend the allocation with the rcu struct, and
531 * workqueue if necessary (for vmalloc).
533 if (rcu_use_vmalloc(size)) {
534 out = vmalloc(HDRLEN_VMALLOC + size);
536 out += HDRLEN_VMALLOC;
537 container_of(out, struct ipc_rcu_hdr, data)->is_vmalloc = 1;
538 container_of(out, struct ipc_rcu_hdr, data)->refcount = 1;
541 out = kmalloc(HDRLEN_KMALLOC + size, GFP_KERNEL);
543 out += HDRLEN_KMALLOC;
544 container_of(out, struct ipc_rcu_hdr, data)->is_vmalloc = 0;
545 container_of(out, struct ipc_rcu_hdr, data)->refcount = 1;
552 void ipc_rcu_getref(void *ptr)
554 container_of(ptr, struct ipc_rcu_hdr, data)->refcount++;
557 static void ipc_do_vfree(struct work_struct *work)
559 vfree(container_of(work, struct ipc_rcu_sched, work));
563 * ipc_schedule_free - free ipc + rcu space
564 * @head: RCU callback structure for queued work
566 * Since RCU callback function is called in bh,
567 * we need to defer the vfree to schedule_work().
569 static void ipc_schedule_free(struct rcu_head *head)
571 struct ipc_rcu_grace *grace;
572 struct ipc_rcu_sched *sched;
574 grace = container_of(head, struct ipc_rcu_grace, rcu);
575 sched = container_of(&(grace->data[0]), struct ipc_rcu_sched,
578 INIT_WORK(&sched->work, ipc_do_vfree);
579 schedule_work(&sched->work);
583 * ipc_immediate_free - free ipc + rcu space
584 * @head: RCU callback structure that contains pointer to be freed
586 * Free from the RCU callback context.
588 static void ipc_immediate_free(struct rcu_head *head)
590 struct ipc_rcu_grace *free =
591 container_of(head, struct ipc_rcu_grace, rcu);
595 void ipc_rcu_putref(void *ptr)
597 if (--container_of(ptr, struct ipc_rcu_hdr, data)->refcount > 0)
600 if (container_of(ptr, struct ipc_rcu_hdr, data)->is_vmalloc) {
601 call_rcu(&container_of(ptr, struct ipc_rcu_grace, data)->rcu,
604 call_rcu(&container_of(ptr, struct ipc_rcu_grace, data)->rcu,
610 * ipcperms - check IPC permissions
611 * @ipcp: IPC permission set
612 * @flag: desired permission set.
614 * Check user, group, other permissions for access
615 * to ipc resources. return 0 if allowed
618 int ipcperms (struct kern_ipc_perm *ipcp, short flag)
619 { /* flag will most probably be 0 or S_...UGO from <linux/stat.h> */
620 int requested_mode, granted_mode, err;
622 if (unlikely((err = audit_ipc_obj(ipcp))))
624 requested_mode = (flag >> 6) | (flag >> 3) | flag;
625 granted_mode = ipcp->mode;
626 if (current->euid == ipcp->cuid || current->euid == ipcp->uid)
628 else if (in_group_p(ipcp->cgid) || in_group_p(ipcp->gid))
630 /* is there some bit set in requested_mode but not in granted_mode? */
631 if ((requested_mode & ~granted_mode & 0007) &&
632 !capable(CAP_IPC_OWNER))
635 return security_ipc_permission(ipcp, flag);
639 * Functions to convert between the kern_ipc_perm structure and the
640 * old/new ipc_perm structures
644 * kernel_to_ipc64_perm - convert kernel ipc permissions to user
645 * @in: kernel permissions
646 * @out: new style IPC permissions
648 * Turn the kernel object @in into a set of permissions descriptions
649 * for returning to userspace (@out).
653 void kernel_to_ipc64_perm (struct kern_ipc_perm *in, struct ipc64_perm *out)
658 out->cuid = in->cuid;
659 out->cgid = in->cgid;
660 out->mode = in->mode;
665 * ipc64_perm_to_ipc_perm - convert new ipc permissions to old
666 * @in: new style IPC permissions
667 * @out: old style IPC permissions
669 * Turn the new style permissions object @in into a compatibility
670 * object and store it into the @out pointer.
673 void ipc64_perm_to_ipc_perm (struct ipc64_perm *in, struct ipc_perm *out)
676 SET_UID(out->uid, in->uid);
677 SET_GID(out->gid, in->gid);
678 SET_UID(out->cuid, in->cuid);
679 SET_GID(out->cgid, in->cgid);
680 out->mode = in->mode;
685 * ipc_lock - Lock an ipc structure without rw_mutex held
686 * @ids: IPC identifier set
687 * @id: ipc id to look for
689 * Look for an id in the ipc ids idr and lock the associated ipc object.
691 * The ipc object is locked on exit.
693 * This is the routine that should be called when the rw_mutex is not already
694 * held, i.e. idr tree not protected: it protects the idr tree in read mode
695 * during the idr_find().
698 struct kern_ipc_perm *ipc_lock(struct ipc_ids *ids, int id)
700 struct kern_ipc_perm *out;
701 int lid = ipcid_to_idx(id);
703 down_read(&ids->rw_mutex);
706 out = idr_find(&ids->ipcs_idr, lid);
709 up_read(&ids->rw_mutex);
710 return ERR_PTR(-EINVAL);
713 up_read(&ids->rw_mutex);
715 spin_lock(&out->lock);
717 /* ipc_rmid() may have already freed the ID while ipc_lock
718 * was spinning: here verify that the structure is still valid
721 spin_unlock(&out->lock);
723 return ERR_PTR(-EINVAL);
730 * ipc_lock_down - Lock an ipc structure with rw_sem held
731 * @ids: IPC identifier set
732 * @id: ipc id to look for
734 * Look for an id in the ipc ids idr and lock the associated ipc object.
736 * The ipc object is locked on exit.
738 * This is the routine that should be called when the rw_mutex is already
739 * held, i.e. idr tree protected.
742 struct kern_ipc_perm *ipc_lock_down(struct ipc_ids *ids, int id)
744 struct kern_ipc_perm *out;
745 int lid = ipcid_to_idx(id);
748 out = idr_find(&ids->ipcs_idr, lid);
751 return ERR_PTR(-EINVAL);
754 spin_lock(&out->lock);
757 * No need to verify that the structure is still valid since the
763 struct kern_ipc_perm *ipc_lock_check_down(struct ipc_ids *ids, int id)
765 struct kern_ipc_perm *out;
767 out = ipc_lock_down(ids, id);
771 if (ipc_checkid(out, id)) {
773 return ERR_PTR(-EIDRM);
779 struct kern_ipc_perm *ipc_lock_check(struct ipc_ids *ids, int id)
781 struct kern_ipc_perm *out;
783 out = ipc_lock(ids, id);
787 if (ipc_checkid(out, id)) {
789 return ERR_PTR(-EIDRM);
796 * ipcget - Common sys_*get() code
798 * @ids : IPC identifier set
799 * @ops : operations to be called on ipc object creation, permission checks
801 * @params : the parameters needed by the previous operations.
803 * Common routine called by sys_msgget(), sys_semget() and sys_shmget().
805 int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,
806 struct ipc_ops *ops, struct ipc_params *params)
808 if (params->key == IPC_PRIVATE)
809 return ipcget_new(ns, ids, ops, params);
811 return ipcget_public(ns, ids, ops, params);
815 * ipc_update_perm - update the permissions of an IPC.
816 * @in: the permission given as input.
817 * @out: the permission of the ipc to set.
819 void ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out)
823 out->mode = (out->mode & ~S_IRWXUGO)
824 | (in->mode & S_IRWXUGO);
828 * ipcctl_pre_down - retrieve an ipc and check permissions for some IPC_XXX cmd
829 * @ids: the table of ids where to look for the ipc
830 * @id: the id of the ipc to retrieve
831 * @cmd: the cmd to check
832 * @perm: the permission to set
833 * @extra_perm: one extra permission parameter used by msq
835 * This function does some common audit and permissions check for some IPC_XXX
836 * cmd and is called from semctl_down, shmctl_down and msgctl_down.
837 * It must be called without any lock held and
838 * - retrieves the ipc with the given id in the given table.
839 * - performs some audit and permission check, depending on the given cmd
840 * - returns the ipc with both ipc and rw_mutex locks held in case of success
841 * or an err-code without any lock held otherwise.
843 struct kern_ipc_perm *ipcctl_pre_down(struct ipc_ids *ids, int id, int cmd,
844 struct ipc64_perm *perm, int extra_perm)
846 struct kern_ipc_perm *ipcp;
849 down_write(&ids->rw_mutex);
850 ipcp = ipc_lock_check_down(ids, id);
856 err = audit_ipc_obj(ipcp);
860 if (cmd == IPC_SET) {
861 err = audit_ipc_set_perm(extra_perm, perm->uid,
862 perm->gid, perm->mode);
866 if (current->euid == ipcp->cuid ||
867 current->euid == ipcp->uid || capable(CAP_SYS_ADMIN))
874 up_write(&ids->rw_mutex);
878 #ifdef __ARCH_WANT_IPC_PARSE_VERSION
882 * ipc_parse_version - IPC call version
883 * @cmd: pointer to command
885 * Return IPC_64 for new style IPC and IPC_OLD for old style IPC.
886 * The @cmd value is turned from an encoding command and version into
887 * just the command code.
890 int ipc_parse_version (int *cmd)
900 #endif /* __ARCH_WANT_IPC_PARSE_VERSION */
902 #ifdef CONFIG_PROC_FS
903 struct ipc_proc_iter {
904 struct ipc_namespace *ns;
905 struct ipc_proc_iface *iface;
909 * This routine locks the ipc structure found at least at position pos.
911 static struct kern_ipc_perm *sysvipc_find_ipc(struct ipc_ids *ids, loff_t pos,
914 struct kern_ipc_perm *ipc;
918 for (id = 0; id < pos && total < ids->in_use; id++) {
919 ipc = idr_find(&ids->ipcs_idr, id);
924 if (total >= ids->in_use)
927 for ( ; pos < IPCMNI; pos++) {
928 ipc = idr_find(&ids->ipcs_idr, pos);
931 ipc_lock_by_ptr(ipc);
936 /* Out of range - return NULL to terminate iteration */
940 static void *sysvipc_proc_next(struct seq_file *s, void *it, loff_t *pos)
942 struct ipc_proc_iter *iter = s->private;
943 struct ipc_proc_iface *iface = iter->iface;
944 struct kern_ipc_perm *ipc = it;
946 /* If we had an ipc id locked before, unlock it */
947 if (ipc && ipc != SEQ_START_TOKEN)
950 return sysvipc_find_ipc(&iter->ns->ids[iface->ids], *pos, pos);
954 * File positions: pos 0 -> header, pos n -> ipc id = n - 1.
955 * SeqFile iterator: iterator value locked ipc pointer or SEQ_TOKEN_START.
957 static void *sysvipc_proc_start(struct seq_file *s, loff_t *pos)
959 struct ipc_proc_iter *iter = s->private;
960 struct ipc_proc_iface *iface = iter->iface;
963 ids = &iter->ns->ids[iface->ids];
966 * Take the lock - this will be released by the corresponding
969 down_read(&ids->rw_mutex);
971 /* pos < 0 is invalid */
975 /* pos == 0 means header */
977 return SEQ_START_TOKEN;
979 /* Find the (pos-1)th ipc */
980 return sysvipc_find_ipc(ids, *pos - 1, pos);
983 static void sysvipc_proc_stop(struct seq_file *s, void *it)
985 struct kern_ipc_perm *ipc = it;
986 struct ipc_proc_iter *iter = s->private;
987 struct ipc_proc_iface *iface = iter->iface;
990 /* If we had a locked structure, release it */
991 if (ipc && ipc != SEQ_START_TOKEN)
994 ids = &iter->ns->ids[iface->ids];
995 /* Release the lock we took in start() */
996 up_read(&ids->rw_mutex);
999 static int sysvipc_proc_show(struct seq_file *s, void *it)
1001 struct ipc_proc_iter *iter = s->private;
1002 struct ipc_proc_iface *iface = iter->iface;
1004 if (it == SEQ_START_TOKEN)
1005 return seq_puts(s, iface->header);
1007 return iface->show(s, it);
1010 static struct seq_operations sysvipc_proc_seqops = {
1011 .start = sysvipc_proc_start,
1012 .stop = sysvipc_proc_stop,
1013 .next = sysvipc_proc_next,
1014 .show = sysvipc_proc_show,
1017 static int sysvipc_proc_open(struct inode *inode, struct file *file)
1020 struct seq_file *seq;
1021 struct ipc_proc_iter *iter;
1024 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
1028 ret = seq_open(file, &sysvipc_proc_seqops);
1032 seq = file->private_data;
1033 seq->private = iter;
1035 iter->iface = PDE(inode)->data;
1036 iter->ns = get_ipc_ns(current->nsproxy->ipc_ns);
1044 static int sysvipc_proc_release(struct inode *inode, struct file *file)
1046 struct seq_file *seq = file->private_data;
1047 struct ipc_proc_iter *iter = seq->private;
1048 put_ipc_ns(iter->ns);
1049 return seq_release_private(inode, file);
1052 static const struct file_operations sysvipc_proc_fops = {
1053 .open = sysvipc_proc_open,
1055 .llseek = seq_lseek,
1056 .release = sysvipc_proc_release,
1058 #endif /* CONFIG_PROC_FS */