3 * Copyright (C) 1992 Krishna Balasubramanian
5 * Removed all the remaining kerneld mess
6 * Catch the -EFAULT stuff properly
7 * Use GFP_KERNEL for messages as in 1.2
8 * Fixed up the unchecked user space derefs
9 * Copyright (C) 1998 Alan Cox & Andi Kleen
11 * /proc/sysvipc/msg support (c) 1999 Dragos Acostachioaie <dragos@iname.com>
13 * mostly rewritten, threaded and wake-one semantics added
14 * MSGMAX limit removed, sysctl's added
15 * (c) 1999 Manfred Spraul <manfred@colorfullife.com>
17 * support for audit of ipc object properties and permission changes
18 * Dustin Kirkland <dustin.kirkland@us.ibm.com>
22 * Pavel Emelianov <xemul@openvz.org>
25 #include <linux/capability.h>
26 #include <linux/msg.h>
27 #include <linux/spinlock.h>
28 #include <linux/init.h>
30 #include <linux/proc_fs.h>
31 #include <linux/list.h>
32 #include <linux/security.h>
33 #include <linux/sched.h>
34 #include <linux/syscalls.h>
35 #include <linux/audit.h>
36 #include <linux/seq_file.h>
37 #include <linux/rwsem.h>
38 #include <linux/nsproxy.h>
39 #include <linux/ipc_namespace.h>
41 #include <asm/current.h>
42 #include <linux/uaccess.h>
45 /* one msg_receiver structure for each sleeping receiver */
47 struct list_head r_list;
48 struct task_struct *r_tsk;
55 * Mark r_msg volatile so that the compiler
56 * does not try to get smart and optimize
57 * it. We rely on this for the lockless
60 struct msg_msg *volatile r_msg;
63 /* one msg_sender for each sleeping sender */
65 struct list_head list;
66 struct task_struct *tsk;
70 #define SEARCH_EQUAL 2
71 #define SEARCH_NOTEQUAL 3
72 #define SEARCH_LESSEQUAL 4
73 #define SEARCH_NUMBER 5
75 #define msg_ids(ns) ((ns)->ids[IPC_MSG_IDS])
77 static inline struct msg_queue *msq_obtain_object(struct ipc_namespace *ns, int id)
79 struct kern_ipc_perm *ipcp = ipc_obtain_object_idr(&msg_ids(ns), id);
82 return ERR_CAST(ipcp);
84 return container_of(ipcp, struct msg_queue, q_perm);
87 static inline struct msg_queue *msq_obtain_object_check(struct ipc_namespace *ns,
90 struct kern_ipc_perm *ipcp = ipc_obtain_object_check(&msg_ids(ns), id);
93 return ERR_CAST(ipcp);
95 return container_of(ipcp, struct msg_queue, q_perm);
98 static inline void msg_rmid(struct ipc_namespace *ns, struct msg_queue *s)
100 ipc_rmid(&msg_ids(ns), &s->q_perm);
103 static void msg_rcu_free(struct rcu_head *head)
105 struct ipc_rcu *p = container_of(head, struct ipc_rcu, rcu);
106 struct msg_queue *msq = ipc_rcu_to_struct(p);
108 security_msg_queue_free(msq);
113 * newque - Create a new msg queue
115 * @params: ptr to the structure that contains the key and msgflg
117 * Called with msg_ids.rwsem held (writer)
119 static int newque(struct ipc_namespace *ns, struct ipc_params *params)
121 struct msg_queue *msq;
123 key_t key = params->key;
124 int msgflg = params->flg;
126 msq = ipc_rcu_alloc(sizeof(*msq));
130 msq->q_perm.mode = msgflg & S_IRWXUGO;
131 msq->q_perm.key = key;
133 msq->q_perm.security = NULL;
134 retval = security_msg_queue_alloc(msq);
136 ipc_rcu_putref(msq, ipc_rcu_free);
140 msq->q_stime = msq->q_rtime = 0;
141 msq->q_ctime = get_seconds();
142 msq->q_cbytes = msq->q_qnum = 0;
143 msq->q_qbytes = ns->msg_ctlmnb;
144 msq->q_lspid = msq->q_lrpid = 0;
145 INIT_LIST_HEAD(&msq->q_messages);
146 INIT_LIST_HEAD(&msq->q_receivers);
147 INIT_LIST_HEAD(&msq->q_senders);
149 /* ipc_addid() locks msq upon success. */
150 id = ipc_addid(&msg_ids(ns), &msq->q_perm, ns->msg_ctlmni);
152 ipc_rcu_putref(msq, msg_rcu_free);
156 ipc_unlock_object(&msq->q_perm);
159 return msq->q_perm.id;
162 static inline void ss_add(struct msg_queue *msq, struct msg_sender *mss)
165 __set_current_state(TASK_INTERRUPTIBLE);
166 list_add_tail(&mss->list, &msq->q_senders);
169 static inline void ss_del(struct msg_sender *mss)
171 if (mss->list.next != NULL)
172 list_del(&mss->list);
175 static void ss_wakeup(struct list_head *h, int kill)
177 struct msg_sender *mss, *t;
179 list_for_each_entry_safe(mss, t, h, list) {
181 mss->list.next = NULL;
182 wake_up_process(mss->tsk);
186 static void expunge_all(struct msg_queue *msq, int res,
187 struct wake_q_head *wake_q)
189 struct msg_receiver *msr, *t;
191 list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) {
193 wake_q_add(wake_q, msr->r_tsk);
194 msr->r_msg = ERR_PTR(res);
199 * freeque() wakes up waiters on the sender and receiver waiting queue,
200 * removes the message queue from message queue ID IDR, and cleans up all the
201 * messages associated with this queue.
203 * msg_ids.rwsem (writer) and the spinlock for this message queue are held
204 * before freeque() is called. msg_ids.rwsem remains locked on exit.
206 static void freeque(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp)
208 struct msg_msg *msg, *t;
209 struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm);
212 expunge_all(msq, -EIDRM, &wake_q);
213 ss_wakeup(&msq->q_senders, 1);
215 ipc_unlock_object(&msq->q_perm);
219 list_for_each_entry_safe(msg, t, &msq->q_messages, m_list) {
220 atomic_dec(&ns->msg_hdrs);
223 atomic_sub(msq->q_cbytes, &ns->msg_bytes);
224 ipc_rcu_putref(msq, msg_rcu_free);
228 * Called with msg_ids.rwsem and ipcp locked.
230 static inline int msg_security(struct kern_ipc_perm *ipcp, int msgflg)
232 struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm);
234 return security_msg_queue_associate(msq, msgflg);
237 SYSCALL_DEFINE2(msgget, key_t, key, int, msgflg)
239 struct ipc_namespace *ns;
240 static const struct ipc_ops msg_ops = {
242 .associate = msg_security,
244 struct ipc_params msg_params;
246 ns = current->nsproxy->ipc_ns;
248 msg_params.key = key;
249 msg_params.flg = msgflg;
251 return ipcget(ns, &msg_ids(ns), &msg_ops, &msg_params);
254 static inline unsigned long
255 copy_msqid_to_user(void __user *buf, struct msqid64_ds *in, int version)
259 return copy_to_user(buf, in, sizeof(*in));
264 memset(&out, 0, sizeof(out));
266 ipc64_perm_to_ipc_perm(&in->msg_perm, &out.msg_perm);
268 out.msg_stime = in->msg_stime;
269 out.msg_rtime = in->msg_rtime;
270 out.msg_ctime = in->msg_ctime;
272 if (in->msg_cbytes > USHRT_MAX)
273 out.msg_cbytes = USHRT_MAX;
275 out.msg_cbytes = in->msg_cbytes;
276 out.msg_lcbytes = in->msg_cbytes;
278 if (in->msg_qnum > USHRT_MAX)
279 out.msg_qnum = USHRT_MAX;
281 out.msg_qnum = in->msg_qnum;
283 if (in->msg_qbytes > USHRT_MAX)
284 out.msg_qbytes = USHRT_MAX;
286 out.msg_qbytes = in->msg_qbytes;
287 out.msg_lqbytes = in->msg_qbytes;
289 out.msg_lspid = in->msg_lspid;
290 out.msg_lrpid = in->msg_lrpid;
292 return copy_to_user(buf, &out, sizeof(out));
299 static inline unsigned long
300 copy_msqid_from_user(struct msqid64_ds *out, void __user *buf, int version)
304 if (copy_from_user(out, buf, sizeof(*out)))
309 struct msqid_ds tbuf_old;
311 if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old)))
314 out->msg_perm.uid = tbuf_old.msg_perm.uid;
315 out->msg_perm.gid = tbuf_old.msg_perm.gid;
316 out->msg_perm.mode = tbuf_old.msg_perm.mode;
318 if (tbuf_old.msg_qbytes == 0)
319 out->msg_qbytes = tbuf_old.msg_lqbytes;
321 out->msg_qbytes = tbuf_old.msg_qbytes;
331 * This function handles some msgctl commands which require the rwsem
332 * to be held in write mode.
333 * NOTE: no locks must be held, the rwsem is taken inside this function.
335 static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd,
336 struct msqid_ds __user *buf, int version)
338 struct kern_ipc_perm *ipcp;
339 struct msqid64_ds uninitialized_var(msqid64);
340 struct msg_queue *msq;
344 if (cmd == IPC_SET) {
345 if (copy_msqid_from_user(&msqid64, buf, version))
349 down_write(&msg_ids(ns).rwsem);
352 ipcp = ipcctl_pre_down_nolock(ns, &msg_ids(ns), msqid, cmd,
353 &msqid64.msg_perm, msqid64.msg_qbytes);
359 msq = container_of(ipcp, struct msg_queue, q_perm);
361 err = security_msg_queue_msgctl(msq, cmd);
367 ipc_lock_object(&msq->q_perm);
368 /* freeque unlocks the ipc object and rcu */
372 if (msqid64.msg_qbytes > ns->msg_ctlmnb &&
373 !capable(CAP_SYS_RESOURCE)) {
378 ipc_lock_object(&msq->q_perm);
379 err = ipc_update_perm(&msqid64.msg_perm, ipcp);
383 msq->q_qbytes = msqid64.msg_qbytes;
385 msq->q_ctime = get_seconds();
386 /* sleeping receivers might be excluded by
387 * stricter permissions.
389 expunge_all(msq, -EAGAIN, &wake_q);
390 /* sleeping senders might be able to send
391 * due to a larger queue size.
393 ss_wakeup(&msq->q_senders, 0);
401 ipc_unlock_object(&msq->q_perm);
406 up_write(&msg_ids(ns).rwsem);
410 static int msgctl_nolock(struct ipc_namespace *ns, int msqid,
411 int cmd, int version, void __user *buf)
414 struct msg_queue *msq;
420 struct msginfo msginfo;
427 * We must not return kernel stack data.
428 * due to padding, it's not enough
429 * to set all member fields.
431 err = security_msg_queue_msgctl(NULL, cmd);
435 memset(&msginfo, 0, sizeof(msginfo));
436 msginfo.msgmni = ns->msg_ctlmni;
437 msginfo.msgmax = ns->msg_ctlmax;
438 msginfo.msgmnb = ns->msg_ctlmnb;
439 msginfo.msgssz = MSGSSZ;
440 msginfo.msgseg = MSGSEG;
441 down_read(&msg_ids(ns).rwsem);
442 if (cmd == MSG_INFO) {
443 msginfo.msgpool = msg_ids(ns).in_use;
444 msginfo.msgmap = atomic_read(&ns->msg_hdrs);
445 msginfo.msgtql = atomic_read(&ns->msg_bytes);
447 msginfo.msgmap = MSGMAP;
448 msginfo.msgpool = MSGPOOL;
449 msginfo.msgtql = MSGTQL;
451 max_id = ipc_get_maxid(&msg_ids(ns));
452 up_read(&msg_ids(ns).rwsem);
453 if (copy_to_user(buf, &msginfo, sizeof(struct msginfo)))
455 return (max_id < 0) ? 0 : max_id;
461 struct msqid64_ds tbuf;
467 memset(&tbuf, 0, sizeof(tbuf));
470 if (cmd == MSG_STAT) {
471 msq = msq_obtain_object(ns, msqid);
476 success_return = msq->q_perm.id;
478 msq = msq_obtain_object_check(ns, msqid);
487 if (ipcperms(ns, &msq->q_perm, S_IRUGO))
490 err = security_msg_queue_msgctl(msq, cmd);
494 kernel_to_ipc64_perm(&msq->q_perm, &tbuf.msg_perm);
495 tbuf.msg_stime = msq->q_stime;
496 tbuf.msg_rtime = msq->q_rtime;
497 tbuf.msg_ctime = msq->q_ctime;
498 tbuf.msg_cbytes = msq->q_cbytes;
499 tbuf.msg_qnum = msq->q_qnum;
500 tbuf.msg_qbytes = msq->q_qbytes;
501 tbuf.msg_lspid = msq->q_lspid;
502 tbuf.msg_lrpid = msq->q_lrpid;
505 if (copy_msqid_to_user(buf, &tbuf, version))
507 return success_return;
520 SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, struct msqid_ds __user *, buf)
523 struct ipc_namespace *ns;
525 if (msqid < 0 || cmd < 0)
528 version = ipc_parse_version(&cmd);
529 ns = current->nsproxy->ipc_ns;
534 case MSG_STAT: /* msqid is an index rather than a msg queue id */
536 return msgctl_nolock(ns, msqid, cmd, version, buf);
539 return msgctl_down(ns, msqid, cmd, buf, version);
545 static int testmsg(struct msg_msg *msg, long type, int mode)
551 case SEARCH_LESSEQUAL:
552 if (msg->m_type <= type)
556 if (msg->m_type == type)
559 case SEARCH_NOTEQUAL:
560 if (msg->m_type != type)
567 static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg,
568 struct wake_q_head *wake_q)
570 struct msg_receiver *msr, *t;
572 list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) {
573 if (testmsg(msg, msr->r_msgtype, msr->r_mode) &&
574 !security_msg_queue_msgrcv(msq, msg, msr->r_tsk,
575 msr->r_msgtype, msr->r_mode)) {
577 list_del(&msr->r_list);
578 if (msr->r_maxsize < msg->m_ts) {
579 wake_q_add(wake_q, msr->r_tsk);
580 msr->r_msg = ERR_PTR(-E2BIG);
582 msq->q_lrpid = task_pid_vnr(msr->r_tsk);
583 msq->q_rtime = get_seconds();
584 wake_q_add(wake_q, msr->r_tsk);
594 long do_msgsnd(int msqid, long mtype, void __user *mtext,
595 size_t msgsz, int msgflg)
597 struct msg_queue *msq;
600 struct ipc_namespace *ns;
603 ns = current->nsproxy->ipc_ns;
605 if (msgsz > ns->msg_ctlmax || (long) msgsz < 0 || msqid < 0)
610 msg = load_msg(mtext, msgsz);
618 msq = msq_obtain_object_check(ns, msqid);
624 ipc_lock_object(&msq->q_perm);
630 if (ipcperms(ns, &msq->q_perm, S_IWUGO))
633 /* raced with RMID? */
634 if (!ipc_valid_object(&msq->q_perm)) {
639 err = security_msg_queue_msgsnd(msq, msg, msgflg);
643 if (msgsz + msq->q_cbytes <= msq->q_qbytes &&
644 1 + msq->q_qnum <= msq->q_qbytes) {
648 /* queue full, wait: */
649 if (msgflg & IPC_NOWAIT) {
654 /* enqueue the sender and prepare to block */
657 if (!ipc_rcu_getref(msq)) {
662 ipc_unlock_object(&msq->q_perm);
667 ipc_lock_object(&msq->q_perm);
669 ipc_rcu_putref(msq, msg_rcu_free);
670 /* raced with RMID? */
671 if (!ipc_valid_object(&msq->q_perm)) {
678 if (signal_pending(current)) {
679 err = -ERESTARTNOHAND;
684 msq->q_lspid = task_tgid_vnr(current);
685 msq->q_stime = get_seconds();
687 if (!pipelined_send(msq, msg, &wake_q)) {
688 /* no one is waiting for this message, enqueue it */
689 list_add_tail(&msg->m_list, &msq->q_messages);
690 msq->q_cbytes += msgsz;
692 atomic_add(msgsz, &ns->msg_bytes);
693 atomic_inc(&ns->msg_hdrs);
700 ipc_unlock_object(&msq->q_perm);
709 SYSCALL_DEFINE4(msgsnd, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz,
714 if (get_user(mtype, &msgp->mtype))
716 return do_msgsnd(msqid, mtype, msgp->mtext, msgsz, msgflg);
719 static inline int convert_mode(long *msgtyp, int msgflg)
721 if (msgflg & MSG_COPY)
722 return SEARCH_NUMBER;
724 * find message of correct type.
725 * msgtyp = 0 => get first.
726 * msgtyp > 0 => get first message of matching type.
727 * msgtyp < 0 => get message with least type must be < abs(msgtype).
733 return SEARCH_LESSEQUAL;
735 if (msgflg & MSG_EXCEPT)
736 return SEARCH_NOTEQUAL;
740 static long do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz)
742 struct msgbuf __user *msgp = dest;
745 if (put_user(msg->m_type, &msgp->mtype))
748 msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz;
749 if (store_msg(msgp->mtext, msg, msgsz))
754 #ifdef CONFIG_CHECKPOINT_RESTORE
756 * This function creates new kernel message structure, large enough to store
757 * bufsz message bytes.
759 static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz)
761 struct msg_msg *copy;
764 * Create dummy message to copy real message to.
766 copy = load_msg(buf, bufsz);
772 static inline void free_copy(struct msg_msg *copy)
778 static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz)
780 return ERR_PTR(-ENOSYS);
783 static inline void free_copy(struct msg_msg *copy)
788 static struct msg_msg *find_msg(struct msg_queue *msq, long *msgtyp, int mode)
790 struct msg_msg *msg, *found = NULL;
793 list_for_each_entry(msg, &msq->q_messages, m_list) {
794 if (testmsg(msg, *msgtyp, mode) &&
795 !security_msg_queue_msgrcv(msq, msg, current,
797 if (mode == SEARCH_LESSEQUAL && msg->m_type != 1) {
798 *msgtyp = msg->m_type - 1;
800 } else if (mode == SEARCH_NUMBER) {
801 if (*msgtyp == count)
809 return found ?: ERR_PTR(-EAGAIN);
812 long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, int msgflg,
813 long (*msg_handler)(void __user *, struct msg_msg *, size_t))
816 struct msg_queue *msq;
817 struct ipc_namespace *ns;
818 struct msg_msg *msg, *copy = NULL;
820 ns = current->nsproxy->ipc_ns;
822 if (msqid < 0 || (long) bufsz < 0)
825 if (msgflg & MSG_COPY) {
826 if ((msgflg & MSG_EXCEPT) || !(msgflg & IPC_NOWAIT))
828 copy = prepare_copy(buf, min_t(size_t, bufsz, ns->msg_ctlmax));
830 return PTR_ERR(copy);
832 mode = convert_mode(&msgtyp, msgflg);
835 msq = msq_obtain_object_check(ns, msqid);
843 struct msg_receiver msr_d;
845 msg = ERR_PTR(-EACCES);
846 if (ipcperms(ns, &msq->q_perm, S_IRUGO))
849 ipc_lock_object(&msq->q_perm);
851 /* raced with RMID? */
852 if (!ipc_valid_object(&msq->q_perm)) {
853 msg = ERR_PTR(-EIDRM);
857 msg = find_msg(msq, &msgtyp, mode);
860 * Found a suitable message.
861 * Unlink it from the queue.
863 if ((bufsz < msg->m_ts) && !(msgflg & MSG_NOERROR)) {
864 msg = ERR_PTR(-E2BIG);
868 * If we are copying, then do not unlink message and do
869 * not update queue parameters.
871 if (msgflg & MSG_COPY) {
872 msg = copy_msg(msg, copy);
876 list_del(&msg->m_list);
878 msq->q_rtime = get_seconds();
879 msq->q_lrpid = task_tgid_vnr(current);
880 msq->q_cbytes -= msg->m_ts;
881 atomic_sub(msg->m_ts, &ns->msg_bytes);
882 atomic_dec(&ns->msg_hdrs);
883 ss_wakeup(&msq->q_senders, 0);
888 /* No message waiting. Wait for a message */
889 if (msgflg & IPC_NOWAIT) {
890 msg = ERR_PTR(-ENOMSG);
894 list_add_tail(&msr_d.r_list, &msq->q_receivers);
895 msr_d.r_tsk = current;
896 msr_d.r_msgtype = msgtyp;
898 if (msgflg & MSG_NOERROR)
899 msr_d.r_maxsize = INT_MAX;
901 msr_d.r_maxsize = bufsz;
902 msr_d.r_msg = ERR_PTR(-EAGAIN);
903 __set_current_state(TASK_INTERRUPTIBLE);
905 ipc_unlock_object(&msq->q_perm);
909 /* Lockless receive, part 1:
910 * Disable preemption. We don't hold a reference to the queue
911 * and getting a reference would defeat the idea of a lockless
912 * operation, thus the code relies on rcu to guarantee the
914 * Prior to destruction, expunge_all(-EIRDM) changes r_msg.
915 * Thus if r_msg is -EAGAIN, then the queue not yet destroyed.
916 * rcu_read_lock() prevents preemption between reading r_msg
917 * and acquiring the q_perm.lock in ipc_lock_object().
921 /* Lockless receive, part 2:
922 * The work in pipelined_send() and expunge_all():
923 * - Set pointer to message
924 * - Queue the receiver task for later wakeup
925 * - Wake up the process after the lock is dropped.
927 * Should the process wake up before this wakeup (due to a
928 * signal) it will either see the message and continue …
931 msg = (struct msg_msg *)msr_d.r_msg;
932 if (msg != ERR_PTR(-EAGAIN))
936 * … or see -EAGAIN, acquire the lock to check the message
939 ipc_lock_object(&msq->q_perm);
941 msg = (struct msg_msg *)msr_d.r_msg;
942 if (msg != ERR_PTR(-EAGAIN))
945 list_del(&msr_d.r_list);
946 if (signal_pending(current)) {
947 msg = ERR_PTR(-ERESTARTNOHAND);
951 ipc_unlock_object(&msq->q_perm);
955 ipc_unlock_object(&msq->q_perm);
963 bufsz = msg_handler(buf, msg, bufsz);
969 SYSCALL_DEFINE5(msgrcv, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz,
970 long, msgtyp, int, msgflg)
972 return do_msgrcv(msqid, msgp, msgsz, msgtyp, msgflg, do_msg_fill);
976 void msg_init_ns(struct ipc_namespace *ns)
978 ns->msg_ctlmax = MSGMAX;
979 ns->msg_ctlmnb = MSGMNB;
980 ns->msg_ctlmni = MSGMNI;
982 atomic_set(&ns->msg_bytes, 0);
983 atomic_set(&ns->msg_hdrs, 0);
984 ipc_init_ids(&ns->ids[IPC_MSG_IDS]);
988 void msg_exit_ns(struct ipc_namespace *ns)
990 free_ipcs(ns, &msg_ids(ns), freeque);
991 idr_destroy(&ns->ids[IPC_MSG_IDS].ipcs_idr);
995 #ifdef CONFIG_PROC_FS
996 static int sysvipc_msg_proc_show(struct seq_file *s, void *it)
998 struct user_namespace *user_ns = seq_user_ns(s);
999 struct msg_queue *msq = it;
1002 "%10d %10d %4o %10lu %10lu %5u %5u %5u %5u %5u %5u %10lu %10lu %10lu\n",
1010 from_kuid_munged(user_ns, msq->q_perm.uid),
1011 from_kgid_munged(user_ns, msq->q_perm.gid),
1012 from_kuid_munged(user_ns, msq->q_perm.cuid),
1013 from_kgid_munged(user_ns, msq->q_perm.cgid),
1022 void __init msg_init(void)
1024 msg_init_ns(&init_ipc_ns);
1026 ipc_init_proc_interface("sysvipc/msg",
1027 " key msqid perms cbytes qnum lspid lrpid uid gid cuid cgid stime rtime ctime\n",
1028 IPC_MSG_IDS, sysvipc_msg_proc_show);