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(&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 /* ipc_addid() locks msq upon success. */
141 id = ipc_addid(&msg_ids(ns), &msq->q_perm, ns->msg_ctlmni);
143 ipc_rcu_putref(msq, msg_rcu_free);
147 msq->q_stime = msq->q_rtime = 0;
148 msq->q_ctime = get_seconds();
149 msq->q_cbytes = msq->q_qnum = 0;
150 msq->q_qbytes = ns->msg_ctlmnb;
151 msq->q_lspid = msq->q_lrpid = 0;
152 INIT_LIST_HEAD(&msq->q_messages);
153 INIT_LIST_HEAD(&msq->q_receivers);
154 INIT_LIST_HEAD(&msq->q_senders);
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)
188 struct msg_receiver *msr, *t;
190 list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) {
192 * Make sure that the wakeup doesnt preempt
193 * this CPU prematurely. (on PREEMPT_RT)
195 preempt_disable_rt();
197 msr->r_msg = NULL; /* initialize expunge ordering */
198 wake_up_process(msr->r_tsk);
200 * Ensure that the wakeup is visible before setting r_msg as
201 * the receiving end depends on it: either spinning on a nil,
202 * or dealing with -EAGAIN cases. See lockless receive part 1
203 * and 2 in do_msgrcv().
206 msr->r_msg = ERR_PTR(res);
213 * freeque() wakes up waiters on the sender and receiver waiting queue,
214 * removes the message queue from message queue ID IDR, and cleans up all the
215 * messages associated with this queue.
217 * msg_ids.rwsem (writer) and the spinlock for this message queue are held
218 * before freeque() is called. msg_ids.rwsem remains locked on exit.
220 static void freeque(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp)
222 struct msg_msg *msg, *t;
223 struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm);
225 expunge_all(msq, -EIDRM);
226 ss_wakeup(&msq->q_senders, 1);
228 ipc_unlock_object(&msq->q_perm);
231 list_for_each_entry_safe(msg, t, &msq->q_messages, m_list) {
232 atomic_dec(&ns->msg_hdrs);
235 atomic_sub(msq->q_cbytes, &ns->msg_bytes);
236 ipc_rcu_putref(msq, msg_rcu_free);
240 * Called with msg_ids.rwsem and ipcp locked.
242 static inline int msg_security(struct kern_ipc_perm *ipcp, int msgflg)
244 struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm);
246 return security_msg_queue_associate(msq, msgflg);
249 SYSCALL_DEFINE2(msgget, key_t, key, int, msgflg)
251 struct ipc_namespace *ns;
252 static const struct ipc_ops msg_ops = {
254 .associate = msg_security,
256 struct ipc_params msg_params;
258 ns = current->nsproxy->ipc_ns;
260 msg_params.key = key;
261 msg_params.flg = msgflg;
263 return ipcget(ns, &msg_ids(ns), &msg_ops, &msg_params);
266 static inline unsigned long
267 copy_msqid_to_user(void __user *buf, struct msqid64_ds *in, int version)
271 return copy_to_user(buf, in, sizeof(*in));
276 memset(&out, 0, sizeof(out));
278 ipc64_perm_to_ipc_perm(&in->msg_perm, &out.msg_perm);
280 out.msg_stime = in->msg_stime;
281 out.msg_rtime = in->msg_rtime;
282 out.msg_ctime = in->msg_ctime;
284 if (in->msg_cbytes > USHRT_MAX)
285 out.msg_cbytes = USHRT_MAX;
287 out.msg_cbytes = in->msg_cbytes;
288 out.msg_lcbytes = in->msg_cbytes;
290 if (in->msg_qnum > USHRT_MAX)
291 out.msg_qnum = USHRT_MAX;
293 out.msg_qnum = in->msg_qnum;
295 if (in->msg_qbytes > USHRT_MAX)
296 out.msg_qbytes = USHRT_MAX;
298 out.msg_qbytes = in->msg_qbytes;
299 out.msg_lqbytes = in->msg_qbytes;
301 out.msg_lspid = in->msg_lspid;
302 out.msg_lrpid = in->msg_lrpid;
304 return copy_to_user(buf, &out, sizeof(out));
311 static inline unsigned long
312 copy_msqid_from_user(struct msqid64_ds *out, void __user *buf, int version)
316 if (copy_from_user(out, buf, sizeof(*out)))
321 struct msqid_ds tbuf_old;
323 if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old)))
326 out->msg_perm.uid = tbuf_old.msg_perm.uid;
327 out->msg_perm.gid = tbuf_old.msg_perm.gid;
328 out->msg_perm.mode = tbuf_old.msg_perm.mode;
330 if (tbuf_old.msg_qbytes == 0)
331 out->msg_qbytes = tbuf_old.msg_lqbytes;
333 out->msg_qbytes = tbuf_old.msg_qbytes;
343 * This function handles some msgctl commands which require the rwsem
344 * to be held in write mode.
345 * NOTE: no locks must be held, the rwsem is taken inside this function.
347 static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd,
348 struct msqid_ds __user *buf, int version)
350 struct kern_ipc_perm *ipcp;
351 struct msqid64_ds uninitialized_var(msqid64);
352 struct msg_queue *msq;
355 if (cmd == IPC_SET) {
356 if (copy_msqid_from_user(&msqid64, buf, version))
360 down_write(&msg_ids(ns).rwsem);
363 ipcp = ipcctl_pre_down_nolock(ns, &msg_ids(ns), msqid, cmd,
364 &msqid64.msg_perm, msqid64.msg_qbytes);
370 msq = container_of(ipcp, struct msg_queue, q_perm);
372 err = security_msg_queue_msgctl(msq, cmd);
378 ipc_lock_object(&msq->q_perm);
379 /* freeque unlocks the ipc object and rcu */
383 if (msqid64.msg_qbytes > ns->msg_ctlmnb &&
384 !capable(CAP_SYS_RESOURCE)) {
389 ipc_lock_object(&msq->q_perm);
390 err = ipc_update_perm(&msqid64.msg_perm, ipcp);
394 msq->q_qbytes = msqid64.msg_qbytes;
396 msq->q_ctime = get_seconds();
397 /* sleeping receivers might be excluded by
398 * stricter permissions.
400 expunge_all(msq, -EAGAIN);
401 /* sleeping senders might be able to send
402 * due to a larger queue size.
404 ss_wakeup(&msq->q_senders, 0);
412 ipc_unlock_object(&msq->q_perm);
416 up_write(&msg_ids(ns).rwsem);
420 static int msgctl_nolock(struct ipc_namespace *ns, int msqid,
421 int cmd, int version, void __user *buf)
424 struct msg_queue *msq;
430 struct msginfo msginfo;
437 * We must not return kernel stack data.
438 * due to padding, it's not enough
439 * to set all member fields.
441 err = security_msg_queue_msgctl(NULL, cmd);
445 memset(&msginfo, 0, sizeof(msginfo));
446 msginfo.msgmni = ns->msg_ctlmni;
447 msginfo.msgmax = ns->msg_ctlmax;
448 msginfo.msgmnb = ns->msg_ctlmnb;
449 msginfo.msgssz = MSGSSZ;
450 msginfo.msgseg = MSGSEG;
451 down_read(&msg_ids(ns).rwsem);
452 if (cmd == MSG_INFO) {
453 msginfo.msgpool = msg_ids(ns).in_use;
454 msginfo.msgmap = atomic_read(&ns->msg_hdrs);
455 msginfo.msgtql = atomic_read(&ns->msg_bytes);
457 msginfo.msgmap = MSGMAP;
458 msginfo.msgpool = MSGPOOL;
459 msginfo.msgtql = MSGTQL;
461 max_id = ipc_get_maxid(&msg_ids(ns));
462 up_read(&msg_ids(ns).rwsem);
463 if (copy_to_user(buf, &msginfo, sizeof(struct msginfo)))
465 return (max_id < 0) ? 0 : max_id;
471 struct msqid64_ds tbuf;
477 memset(&tbuf, 0, sizeof(tbuf));
480 if (cmd == MSG_STAT) {
481 msq = msq_obtain_object(ns, msqid);
486 success_return = msq->q_perm.id;
488 msq = msq_obtain_object_check(ns, msqid);
497 if (ipcperms(ns, &msq->q_perm, S_IRUGO))
500 err = security_msg_queue_msgctl(msq, cmd);
504 kernel_to_ipc64_perm(&msq->q_perm, &tbuf.msg_perm);
505 tbuf.msg_stime = msq->q_stime;
506 tbuf.msg_rtime = msq->q_rtime;
507 tbuf.msg_ctime = msq->q_ctime;
508 tbuf.msg_cbytes = msq->q_cbytes;
509 tbuf.msg_qnum = msq->q_qnum;
510 tbuf.msg_qbytes = msq->q_qbytes;
511 tbuf.msg_lspid = msq->q_lspid;
512 tbuf.msg_lrpid = msq->q_lrpid;
515 if (copy_msqid_to_user(buf, &tbuf, version))
517 return success_return;
530 SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, struct msqid_ds __user *, buf)
533 struct ipc_namespace *ns;
535 if (msqid < 0 || cmd < 0)
538 version = ipc_parse_version(&cmd);
539 ns = current->nsproxy->ipc_ns;
544 case MSG_STAT: /* msqid is an index rather than a msg queue id */
546 return msgctl_nolock(ns, msqid, cmd, version, buf);
549 return msgctl_down(ns, msqid, cmd, buf, version);
555 static int testmsg(struct msg_msg *msg, long type, int mode)
561 case SEARCH_LESSEQUAL:
562 if (msg->m_type <= type)
566 if (msg->m_type == type)
569 case SEARCH_NOTEQUAL:
570 if (msg->m_type != type)
577 static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg)
579 struct msg_receiver *msr, *t;
581 list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) {
582 if (testmsg(msg, msr->r_msgtype, msr->r_mode) &&
583 !security_msg_queue_msgrcv(msq, msg, msr->r_tsk,
584 msr->r_msgtype, msr->r_mode)) {
586 * Make sure that the wakeup doesnt preempt
587 * this CPU prematurely. (on PREEMPT_RT)
589 preempt_disable_rt();
591 list_del(&msr->r_list);
592 if (msr->r_maxsize < msg->m_ts) {
593 /* initialize pipelined send ordering */
595 wake_up_process(msr->r_tsk);
596 smp_mb(); /* see barrier comment below */
597 msr->r_msg = ERR_PTR(-E2BIG);
600 msq->q_lrpid = task_pid_vnr(msr->r_tsk);
601 msq->q_rtime = get_seconds();
602 wake_up_process(msr->r_tsk);
604 * Ensure that the wakeup is visible before
605 * setting r_msg, as the receiving end depends
606 * on it. See lockless receive part 1 and 2 in
621 long do_msgsnd(int msqid, long mtype, void __user *mtext,
622 size_t msgsz, int msgflg)
624 struct msg_queue *msq;
627 struct ipc_namespace *ns;
629 ns = current->nsproxy->ipc_ns;
631 if (msgsz > ns->msg_ctlmax || (long) msgsz < 0 || msqid < 0)
636 msg = load_msg(mtext, msgsz);
644 msq = msq_obtain_object_check(ns, msqid);
650 ipc_lock_object(&msq->q_perm);
656 if (ipcperms(ns, &msq->q_perm, S_IWUGO))
659 /* raced with RMID? */
660 if (!ipc_valid_object(&msq->q_perm)) {
665 err = security_msg_queue_msgsnd(msq, msg, msgflg);
669 if (msgsz + msq->q_cbytes <= msq->q_qbytes &&
670 1 + msq->q_qnum <= msq->q_qbytes) {
674 /* queue full, wait: */
675 if (msgflg & IPC_NOWAIT) {
680 /* enqueue the sender and prepare to block */
683 if (!ipc_rcu_getref(msq)) {
688 ipc_unlock_object(&msq->q_perm);
693 ipc_lock_object(&msq->q_perm);
695 ipc_rcu_putref(msq, ipc_rcu_free);
696 /* raced with RMID? */
697 if (!ipc_valid_object(&msq->q_perm)) {
704 if (signal_pending(current)) {
705 err = -ERESTARTNOHAND;
710 msq->q_lspid = task_tgid_vnr(current);
711 msq->q_stime = get_seconds();
713 if (!pipelined_send(msq, msg)) {
714 /* no one is waiting for this message, enqueue it */
715 list_add_tail(&msg->m_list, &msq->q_messages);
716 msq->q_cbytes += msgsz;
718 atomic_add(msgsz, &ns->msg_bytes);
719 atomic_inc(&ns->msg_hdrs);
726 ipc_unlock_object(&msq->q_perm);
734 SYSCALL_DEFINE4(msgsnd, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz,
739 if (get_user(mtype, &msgp->mtype))
741 return do_msgsnd(msqid, mtype, msgp->mtext, msgsz, msgflg);
744 static inline int convert_mode(long *msgtyp, int msgflg)
746 if (msgflg & MSG_COPY)
747 return SEARCH_NUMBER;
749 * find message of correct type.
750 * msgtyp = 0 => get first.
751 * msgtyp > 0 => get first message of matching type.
752 * msgtyp < 0 => get message with least type must be < abs(msgtype).
758 return SEARCH_LESSEQUAL;
760 if (msgflg & MSG_EXCEPT)
761 return SEARCH_NOTEQUAL;
765 static long do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz)
767 struct msgbuf __user *msgp = dest;
770 if (put_user(msg->m_type, &msgp->mtype))
773 msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz;
774 if (store_msg(msgp->mtext, msg, msgsz))
779 #ifdef CONFIG_CHECKPOINT_RESTORE
781 * This function creates new kernel message structure, large enough to store
782 * bufsz message bytes.
784 static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz)
786 struct msg_msg *copy;
789 * Create dummy message to copy real message to.
791 copy = load_msg(buf, bufsz);
797 static inline void free_copy(struct msg_msg *copy)
803 static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz)
805 return ERR_PTR(-ENOSYS);
808 static inline void free_copy(struct msg_msg *copy)
813 static struct msg_msg *find_msg(struct msg_queue *msq, long *msgtyp, int mode)
815 struct msg_msg *msg, *found = NULL;
818 list_for_each_entry(msg, &msq->q_messages, m_list) {
819 if (testmsg(msg, *msgtyp, mode) &&
820 !security_msg_queue_msgrcv(msq, msg, current,
822 if (mode == SEARCH_LESSEQUAL && msg->m_type != 1) {
823 *msgtyp = msg->m_type - 1;
825 } else if (mode == SEARCH_NUMBER) {
826 if (*msgtyp == count)
834 return found ?: ERR_PTR(-EAGAIN);
837 long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, int msgflg,
838 long (*msg_handler)(void __user *, struct msg_msg *, size_t))
841 struct msg_queue *msq;
842 struct ipc_namespace *ns;
843 struct msg_msg *msg, *copy = NULL;
845 ns = current->nsproxy->ipc_ns;
847 if (msqid < 0 || (long) bufsz < 0)
850 if (msgflg & MSG_COPY) {
851 if ((msgflg & MSG_EXCEPT) || !(msgflg & IPC_NOWAIT))
853 copy = prepare_copy(buf, min_t(size_t, bufsz, ns->msg_ctlmax));
855 return PTR_ERR(copy);
857 mode = convert_mode(&msgtyp, msgflg);
860 msq = msq_obtain_object_check(ns, msqid);
868 struct msg_receiver msr_d;
870 msg = ERR_PTR(-EACCES);
871 if (ipcperms(ns, &msq->q_perm, S_IRUGO))
874 ipc_lock_object(&msq->q_perm);
876 /* raced with RMID? */
877 if (!ipc_valid_object(&msq->q_perm)) {
878 msg = ERR_PTR(-EIDRM);
882 msg = find_msg(msq, &msgtyp, mode);
885 * Found a suitable message.
886 * Unlink it from the queue.
888 if ((bufsz < msg->m_ts) && !(msgflg & MSG_NOERROR)) {
889 msg = ERR_PTR(-E2BIG);
893 * If we are copying, then do not unlink message and do
894 * not update queue parameters.
896 if (msgflg & MSG_COPY) {
897 msg = copy_msg(msg, copy);
901 list_del(&msg->m_list);
903 msq->q_rtime = get_seconds();
904 msq->q_lrpid = task_tgid_vnr(current);
905 msq->q_cbytes -= msg->m_ts;
906 atomic_sub(msg->m_ts, &ns->msg_bytes);
907 atomic_dec(&ns->msg_hdrs);
908 ss_wakeup(&msq->q_senders, 0);
913 /* No message waiting. Wait for a message */
914 if (msgflg & IPC_NOWAIT) {
915 msg = ERR_PTR(-ENOMSG);
919 list_add_tail(&msr_d.r_list, &msq->q_receivers);
920 msr_d.r_tsk = current;
921 msr_d.r_msgtype = msgtyp;
923 if (msgflg & MSG_NOERROR)
924 msr_d.r_maxsize = INT_MAX;
926 msr_d.r_maxsize = bufsz;
927 msr_d.r_msg = ERR_PTR(-EAGAIN);
928 __set_current_state(TASK_INTERRUPTIBLE);
930 ipc_unlock_object(&msq->q_perm);
934 /* Lockless receive, part 1:
935 * Disable preemption. We don't hold a reference to the queue
936 * and getting a reference would defeat the idea of a lockless
937 * operation, thus the code relies on rcu to guarantee the
939 * Prior to destruction, expunge_all(-EIRDM) changes r_msg.
940 * Thus if r_msg is -EAGAIN, then the queue not yet destroyed.
941 * rcu_read_lock() prevents preemption between reading r_msg
942 * and acquiring the q_perm.lock in ipc_lock_object().
946 /* Lockless receive, part 2:
947 * Wait until pipelined_send or expunge_all are outside of
948 * wake_up_process(). There is a race with exit(), see
949 * ipc/mqueue.c for the details.
951 msg = (struct msg_msg *)msr_d.r_msg;
952 while (msg == NULL) {
954 msg = (struct msg_msg *)msr_d.r_msg;
957 /* Lockless receive, part 3:
958 * If there is a message or an error then accept it without
961 if (msg != ERR_PTR(-EAGAIN))
964 /* Lockless receive, part 3:
965 * Acquire the queue spinlock.
967 ipc_lock_object(&msq->q_perm);
969 /* Lockless receive, part 4:
970 * Repeat test after acquiring the spinlock.
972 msg = (struct msg_msg *)msr_d.r_msg;
973 if (msg != ERR_PTR(-EAGAIN))
976 list_del(&msr_d.r_list);
977 if (signal_pending(current)) {
978 msg = ERR_PTR(-ERESTARTNOHAND);
982 ipc_unlock_object(&msq->q_perm);
986 ipc_unlock_object(&msq->q_perm);
994 bufsz = msg_handler(buf, msg, bufsz);
1000 SYSCALL_DEFINE5(msgrcv, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz,
1001 long, msgtyp, int, msgflg)
1003 return do_msgrcv(msqid, msgp, msgsz, msgtyp, msgflg, do_msg_fill);
1007 void msg_init_ns(struct ipc_namespace *ns)
1009 ns->msg_ctlmax = MSGMAX;
1010 ns->msg_ctlmnb = MSGMNB;
1011 ns->msg_ctlmni = MSGMNI;
1013 atomic_set(&ns->msg_bytes, 0);
1014 atomic_set(&ns->msg_hdrs, 0);
1015 ipc_init_ids(&ns->ids[IPC_MSG_IDS]);
1018 #ifdef CONFIG_IPC_NS
1019 void msg_exit_ns(struct ipc_namespace *ns)
1021 free_ipcs(ns, &msg_ids(ns), freeque);
1022 idr_destroy(&ns->ids[IPC_MSG_IDS].ipcs_idr);
1026 #ifdef CONFIG_PROC_FS
1027 static int sysvipc_msg_proc_show(struct seq_file *s, void *it)
1029 struct user_namespace *user_ns = seq_user_ns(s);
1030 struct msg_queue *msq = it;
1033 "%10d %10d %4o %10lu %10lu %5u %5u %5u %5u %5u %5u %10lu %10lu %10lu\n",
1041 from_kuid_munged(user_ns, msq->q_perm.uid),
1042 from_kgid_munged(user_ns, msq->q_perm.gid),
1043 from_kuid_munged(user_ns, msq->q_perm.cuid),
1044 from_kgid_munged(user_ns, msq->q_perm.cgid),
1053 void __init msg_init(void)
1055 msg_init_ns(&init_ipc_ns);
1057 ipc_init_proc_interface("sysvipc/msg",
1058 " key msqid perms cbytes qnum lspid lrpid uid gid cuid cgid stime rtime ctime\n",
1059 IPC_MSG_IDS, sysvipc_msg_proc_show);