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/wake_q.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;
54 struct msg_msg *r_msg;
57 /* one msg_sender for each sleeping sender */
59 struct list_head list;
60 struct task_struct *tsk;
65 #define SEARCH_EQUAL 2
66 #define SEARCH_NOTEQUAL 3
67 #define SEARCH_LESSEQUAL 4
68 #define SEARCH_NUMBER 5
70 #define msg_ids(ns) ((ns)->ids[IPC_MSG_IDS])
72 static inline struct msg_queue *msq_obtain_object(struct ipc_namespace *ns, int id)
74 struct kern_ipc_perm *ipcp = ipc_obtain_object_idr(&msg_ids(ns), id);
77 return ERR_CAST(ipcp);
79 return container_of(ipcp, struct msg_queue, q_perm);
82 static inline struct msg_queue *msq_obtain_object_check(struct ipc_namespace *ns,
85 struct kern_ipc_perm *ipcp = ipc_obtain_object_check(&msg_ids(ns), id);
88 return ERR_CAST(ipcp);
90 return container_of(ipcp, struct msg_queue, q_perm);
93 static inline void msg_rmid(struct ipc_namespace *ns, struct msg_queue *s)
95 ipc_rmid(&msg_ids(ns), &s->q_perm);
98 static void __msg_free(struct msg_queue *msq)
103 static void msg_rcu_free(struct rcu_head *head)
105 struct kern_ipc_perm *p = container_of(head, struct kern_ipc_perm, rcu);
106 struct msg_queue *msq = container_of(p, struct msg_queue, q_perm);
108 security_msg_queue_free(msq);
112 static struct msg_queue *msg_alloc(void)
114 struct msg_queue *msq;
116 msq = kvmalloc(sizeof(*msq), GFP_KERNEL);
120 atomic_set(&msq->q_perm.refcount, 1);
126 * newque - Create a new msg queue
128 * @params: ptr to the structure that contains the key and msgflg
130 * Called with msg_ids.rwsem held (writer)
132 static int newque(struct ipc_namespace *ns, struct ipc_params *params)
134 struct msg_queue *msq;
136 key_t key = params->key;
137 int msgflg = params->flg;
143 msq->q_perm.mode = msgflg & S_IRWXUGO;
144 msq->q_perm.key = key;
146 msq->q_perm.security = NULL;
147 retval = security_msg_queue_alloc(msq);
153 msq->q_stime = msq->q_rtime = 0;
154 msq->q_ctime = get_seconds();
155 msq->q_cbytes = msq->q_qnum = 0;
156 msq->q_qbytes = ns->msg_ctlmnb;
157 msq->q_lspid = msq->q_lrpid = 0;
158 INIT_LIST_HEAD(&msq->q_messages);
159 INIT_LIST_HEAD(&msq->q_receivers);
160 INIT_LIST_HEAD(&msq->q_senders);
162 /* ipc_addid() locks msq upon success. */
163 id = ipc_addid(&msg_ids(ns), &msq->q_perm, ns->msg_ctlmni);
165 ipc_rcu_putref(&msq->q_perm, msg_rcu_free);
169 ipc_unlock_object(&msq->q_perm);
172 return msq->q_perm.id;
175 static inline bool msg_fits_inqueue(struct msg_queue *msq, size_t msgsz)
177 return msgsz + msq->q_cbytes <= msq->q_qbytes &&
178 1 + msq->q_qnum <= msq->q_qbytes;
181 static inline void ss_add(struct msg_queue *msq,
182 struct msg_sender *mss, size_t msgsz)
186 __set_current_state(TASK_INTERRUPTIBLE);
187 list_add_tail(&mss->list, &msq->q_senders);
190 static inline void ss_del(struct msg_sender *mss)
193 list_del(&mss->list);
196 static void ss_wakeup(struct msg_queue *msq,
197 struct wake_q_head *wake_q, bool kill)
199 struct msg_sender *mss, *t;
200 struct task_struct *stop_tsk = NULL;
201 struct list_head *h = &msq->q_senders;
203 list_for_each_entry_safe(mss, t, h, list) {
205 mss->list.next = NULL;
208 * Stop at the first task we don't wakeup,
209 * we've already iterated the original
212 else if (stop_tsk == mss->tsk)
215 * We are not in an EIDRM scenario here, therefore
216 * verify that we really need to wakeup the task.
217 * To maintain current semantics and wakeup order,
218 * move the sender to the tail on behalf of the
221 else if (!msg_fits_inqueue(msq, mss->msgsz)) {
225 list_move_tail(&mss->list, &msq->q_senders);
229 wake_q_add(wake_q, mss->tsk);
233 static void expunge_all(struct msg_queue *msq, int res,
234 struct wake_q_head *wake_q)
236 struct msg_receiver *msr, *t;
238 list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) {
239 wake_q_add(wake_q, msr->r_tsk);
240 WRITE_ONCE(msr->r_msg, ERR_PTR(res));
245 * freeque() wakes up waiters on the sender and receiver waiting queue,
246 * removes the message queue from message queue ID IDR, and cleans up all the
247 * messages associated with this queue.
249 * msg_ids.rwsem (writer) and the spinlock for this message queue are held
250 * before freeque() is called. msg_ids.rwsem remains locked on exit.
252 static void freeque(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp)
254 struct msg_msg *msg, *t;
255 struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm);
256 DEFINE_WAKE_Q(wake_q);
258 expunge_all(msq, -EIDRM, &wake_q);
259 ss_wakeup(msq, &wake_q, true);
261 ipc_unlock_object(&msq->q_perm);
265 list_for_each_entry_safe(msg, t, &msq->q_messages, m_list) {
266 atomic_dec(&ns->msg_hdrs);
269 atomic_sub(msq->q_cbytes, &ns->msg_bytes);
270 ipc_rcu_putref(&msq->q_perm, msg_rcu_free);
274 * Called with msg_ids.rwsem and ipcp locked.
276 static inline int msg_security(struct kern_ipc_perm *ipcp, int msgflg)
278 struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm);
280 return security_msg_queue_associate(msq, msgflg);
283 SYSCALL_DEFINE2(msgget, key_t, key, int, msgflg)
285 struct ipc_namespace *ns;
286 static const struct ipc_ops msg_ops = {
288 .associate = msg_security,
290 struct ipc_params msg_params;
292 ns = current->nsproxy->ipc_ns;
294 msg_params.key = key;
295 msg_params.flg = msgflg;
297 return ipcget(ns, &msg_ids(ns), &msg_ops, &msg_params);
300 static inline unsigned long
301 copy_msqid_to_user(void __user *buf, struct msqid64_ds *in, int version)
305 return copy_to_user(buf, in, sizeof(*in));
310 memset(&out, 0, sizeof(out));
312 ipc64_perm_to_ipc_perm(&in->msg_perm, &out.msg_perm);
314 out.msg_stime = in->msg_stime;
315 out.msg_rtime = in->msg_rtime;
316 out.msg_ctime = in->msg_ctime;
318 if (in->msg_cbytes > USHRT_MAX)
319 out.msg_cbytes = USHRT_MAX;
321 out.msg_cbytes = in->msg_cbytes;
322 out.msg_lcbytes = in->msg_cbytes;
324 if (in->msg_qnum > USHRT_MAX)
325 out.msg_qnum = USHRT_MAX;
327 out.msg_qnum = in->msg_qnum;
329 if (in->msg_qbytes > USHRT_MAX)
330 out.msg_qbytes = USHRT_MAX;
332 out.msg_qbytes = in->msg_qbytes;
333 out.msg_lqbytes = in->msg_qbytes;
335 out.msg_lspid = in->msg_lspid;
336 out.msg_lrpid = in->msg_lrpid;
338 return copy_to_user(buf, &out, sizeof(out));
345 static inline unsigned long
346 copy_msqid_from_user(struct msqid64_ds *out, void __user *buf, int version)
350 if (copy_from_user(out, buf, sizeof(*out)))
355 struct msqid_ds tbuf_old;
357 if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old)))
360 out->msg_perm.uid = tbuf_old.msg_perm.uid;
361 out->msg_perm.gid = tbuf_old.msg_perm.gid;
362 out->msg_perm.mode = tbuf_old.msg_perm.mode;
364 if (tbuf_old.msg_qbytes == 0)
365 out->msg_qbytes = tbuf_old.msg_lqbytes;
367 out->msg_qbytes = tbuf_old.msg_qbytes;
377 * This function handles some msgctl commands which require the rwsem
378 * to be held in write mode.
379 * NOTE: no locks must be held, the rwsem is taken inside this function.
381 static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd,
382 struct msqid_ds __user *buf, int version)
384 struct kern_ipc_perm *ipcp;
385 struct msqid64_ds uninitialized_var(msqid64);
386 struct msg_queue *msq;
389 if (cmd == IPC_SET) {
390 if (copy_msqid_from_user(&msqid64, buf, version))
394 down_write(&msg_ids(ns).rwsem);
397 ipcp = ipcctl_pre_down_nolock(ns, &msg_ids(ns), msqid, cmd,
398 &msqid64.msg_perm, msqid64.msg_qbytes);
404 msq = container_of(ipcp, struct msg_queue, q_perm);
406 err = security_msg_queue_msgctl(msq, cmd);
412 ipc_lock_object(&msq->q_perm);
413 /* freeque unlocks the ipc object and rcu */
418 DEFINE_WAKE_Q(wake_q);
420 if (msqid64.msg_qbytes > ns->msg_ctlmnb &&
421 !capable(CAP_SYS_RESOURCE)) {
426 ipc_lock_object(&msq->q_perm);
427 err = ipc_update_perm(&msqid64.msg_perm, ipcp);
431 msq->q_qbytes = msqid64.msg_qbytes;
433 msq->q_ctime = get_seconds();
435 * Sleeping receivers might be excluded by
436 * stricter permissions.
438 expunge_all(msq, -EAGAIN, &wake_q);
440 * Sleeping senders might be able to send
441 * due to a larger queue size.
443 ss_wakeup(msq, &wake_q, false);
444 ipc_unlock_object(&msq->q_perm);
455 ipc_unlock_object(&msq->q_perm);
459 up_write(&msg_ids(ns).rwsem);
463 static int msgctl_nolock(struct ipc_namespace *ns, int msqid,
464 int cmd, int version, void __user *buf)
467 struct msg_queue *msq;
473 struct msginfo msginfo;
480 * We must not return kernel stack data.
481 * due to padding, it's not enough
482 * to set all member fields.
484 err = security_msg_queue_msgctl(NULL, cmd);
488 memset(&msginfo, 0, sizeof(msginfo));
489 msginfo.msgmni = ns->msg_ctlmni;
490 msginfo.msgmax = ns->msg_ctlmax;
491 msginfo.msgmnb = ns->msg_ctlmnb;
492 msginfo.msgssz = MSGSSZ;
493 msginfo.msgseg = MSGSEG;
494 down_read(&msg_ids(ns).rwsem);
495 if (cmd == MSG_INFO) {
496 msginfo.msgpool = msg_ids(ns).in_use;
497 msginfo.msgmap = atomic_read(&ns->msg_hdrs);
498 msginfo.msgtql = atomic_read(&ns->msg_bytes);
500 msginfo.msgmap = MSGMAP;
501 msginfo.msgpool = MSGPOOL;
502 msginfo.msgtql = MSGTQL;
504 max_id = ipc_get_maxid(&msg_ids(ns));
505 up_read(&msg_ids(ns).rwsem);
506 if (copy_to_user(buf, &msginfo, sizeof(struct msginfo)))
508 return (max_id < 0) ? 0 : max_id;
514 struct msqid64_ds tbuf;
520 memset(&tbuf, 0, sizeof(tbuf));
523 if (cmd == MSG_STAT) {
524 msq = msq_obtain_object(ns, msqid);
529 success_return = msq->q_perm.id;
531 msq = msq_obtain_object_check(ns, msqid);
540 if (ipcperms(ns, &msq->q_perm, S_IRUGO))
543 err = security_msg_queue_msgctl(msq, cmd);
547 kernel_to_ipc64_perm(&msq->q_perm, &tbuf.msg_perm);
548 tbuf.msg_stime = msq->q_stime;
549 tbuf.msg_rtime = msq->q_rtime;
550 tbuf.msg_ctime = msq->q_ctime;
551 tbuf.msg_cbytes = msq->q_cbytes;
552 tbuf.msg_qnum = msq->q_qnum;
553 tbuf.msg_qbytes = msq->q_qbytes;
554 tbuf.msg_lspid = msq->q_lspid;
555 tbuf.msg_lrpid = msq->q_lrpid;
558 if (copy_msqid_to_user(buf, &tbuf, version))
560 return success_return;
573 SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, struct msqid_ds __user *, buf)
576 struct ipc_namespace *ns;
578 if (msqid < 0 || cmd < 0)
581 version = ipc_parse_version(&cmd);
582 ns = current->nsproxy->ipc_ns;
587 case MSG_STAT: /* msqid is an index rather than a msg queue id */
589 return msgctl_nolock(ns, msqid, cmd, version, buf);
592 return msgctl_down(ns, msqid, cmd, buf, version);
598 static int testmsg(struct msg_msg *msg, long type, int mode)
604 case SEARCH_LESSEQUAL:
605 if (msg->m_type <= type)
609 if (msg->m_type == type)
612 case SEARCH_NOTEQUAL:
613 if (msg->m_type != type)
620 static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg,
621 struct wake_q_head *wake_q)
623 struct msg_receiver *msr, *t;
625 list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) {
626 if (testmsg(msg, msr->r_msgtype, msr->r_mode) &&
627 !security_msg_queue_msgrcv(msq, msg, msr->r_tsk,
628 msr->r_msgtype, msr->r_mode)) {
630 list_del(&msr->r_list);
631 if (msr->r_maxsize < msg->m_ts) {
632 wake_q_add(wake_q, msr->r_tsk);
633 WRITE_ONCE(msr->r_msg, ERR_PTR(-E2BIG));
635 msq->q_lrpid = task_pid_vnr(msr->r_tsk);
636 msq->q_rtime = get_seconds();
638 wake_q_add(wake_q, msr->r_tsk);
639 WRITE_ONCE(msr->r_msg, msg);
648 long do_msgsnd(int msqid, long mtype, void __user *mtext,
649 size_t msgsz, int msgflg)
651 struct msg_queue *msq;
654 struct ipc_namespace *ns;
655 DEFINE_WAKE_Q(wake_q);
657 ns = current->nsproxy->ipc_ns;
659 if (msgsz > ns->msg_ctlmax || (long) msgsz < 0 || msqid < 0)
664 msg = load_msg(mtext, msgsz);
672 msq = msq_obtain_object_check(ns, msqid);
678 ipc_lock_object(&msq->q_perm);
684 if (ipcperms(ns, &msq->q_perm, S_IWUGO))
687 /* raced with RMID? */
688 if (!ipc_valid_object(&msq->q_perm)) {
693 err = security_msg_queue_msgsnd(msq, msg, msgflg);
697 if (msg_fits_inqueue(msq, msgsz))
700 /* queue full, wait: */
701 if (msgflg & IPC_NOWAIT) {
706 /* enqueue the sender and prepare to block */
707 ss_add(msq, &s, msgsz);
709 if (!ipc_rcu_getref(&msq->q_perm)) {
714 ipc_unlock_object(&msq->q_perm);
719 ipc_lock_object(&msq->q_perm);
721 ipc_rcu_putref(&msq->q_perm, msg_rcu_free);
722 /* raced with RMID? */
723 if (!ipc_valid_object(&msq->q_perm)) {
729 if (signal_pending(current)) {
730 err = -ERESTARTNOHAND;
736 msq->q_lspid = task_tgid_vnr(current);
737 msq->q_stime = get_seconds();
739 if (!pipelined_send(msq, msg, &wake_q)) {
740 /* no one is waiting for this message, enqueue it */
741 list_add_tail(&msg->m_list, &msq->q_messages);
742 msq->q_cbytes += msgsz;
744 atomic_add(msgsz, &ns->msg_bytes);
745 atomic_inc(&ns->msg_hdrs);
752 ipc_unlock_object(&msq->q_perm);
761 SYSCALL_DEFINE4(msgsnd, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz,
766 if (get_user(mtype, &msgp->mtype))
768 return do_msgsnd(msqid, mtype, msgp->mtext, msgsz, msgflg);
771 static inline int convert_mode(long *msgtyp, int msgflg)
773 if (msgflg & MSG_COPY)
774 return SEARCH_NUMBER;
776 * find message of correct type.
777 * msgtyp = 0 => get first.
778 * msgtyp > 0 => get first message of matching type.
779 * msgtyp < 0 => get message with least type must be < abs(msgtype).
784 if (*msgtyp == LONG_MIN) /* -LONG_MIN is undefined */
788 return SEARCH_LESSEQUAL;
790 if (msgflg & MSG_EXCEPT)
791 return SEARCH_NOTEQUAL;
795 static long do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz)
797 struct msgbuf __user *msgp = dest;
800 if (put_user(msg->m_type, &msgp->mtype))
803 msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz;
804 if (store_msg(msgp->mtext, msg, msgsz))
809 #ifdef CONFIG_CHECKPOINT_RESTORE
811 * This function creates new kernel message structure, large enough to store
812 * bufsz message bytes.
814 static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz)
816 struct msg_msg *copy;
819 * Create dummy message to copy real message to.
821 copy = load_msg(buf, bufsz);
827 static inline void free_copy(struct msg_msg *copy)
833 static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz)
835 return ERR_PTR(-ENOSYS);
838 static inline void free_copy(struct msg_msg *copy)
843 static struct msg_msg *find_msg(struct msg_queue *msq, long *msgtyp, int mode)
845 struct msg_msg *msg, *found = NULL;
848 list_for_each_entry(msg, &msq->q_messages, m_list) {
849 if (testmsg(msg, *msgtyp, mode) &&
850 !security_msg_queue_msgrcv(msq, msg, current,
852 if (mode == SEARCH_LESSEQUAL && msg->m_type != 1) {
853 *msgtyp = msg->m_type - 1;
855 } else if (mode == SEARCH_NUMBER) {
856 if (*msgtyp == count)
864 return found ?: ERR_PTR(-EAGAIN);
867 long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, int msgflg,
868 long (*msg_handler)(void __user *, struct msg_msg *, size_t))
871 struct msg_queue *msq;
872 struct ipc_namespace *ns;
873 struct msg_msg *msg, *copy = NULL;
874 DEFINE_WAKE_Q(wake_q);
876 ns = current->nsproxy->ipc_ns;
878 if (msqid < 0 || (long) bufsz < 0)
881 if (msgflg & MSG_COPY) {
882 if ((msgflg & MSG_EXCEPT) || !(msgflg & IPC_NOWAIT))
884 copy = prepare_copy(buf, min_t(size_t, bufsz, ns->msg_ctlmax));
886 return PTR_ERR(copy);
888 mode = convert_mode(&msgtyp, msgflg);
891 msq = msq_obtain_object_check(ns, msqid);
899 struct msg_receiver msr_d;
901 msg = ERR_PTR(-EACCES);
902 if (ipcperms(ns, &msq->q_perm, S_IRUGO))
905 ipc_lock_object(&msq->q_perm);
907 /* raced with RMID? */
908 if (!ipc_valid_object(&msq->q_perm)) {
909 msg = ERR_PTR(-EIDRM);
913 msg = find_msg(msq, &msgtyp, mode);
916 * Found a suitable message.
917 * Unlink it from the queue.
919 if ((bufsz < msg->m_ts) && !(msgflg & MSG_NOERROR)) {
920 msg = ERR_PTR(-E2BIG);
924 * If we are copying, then do not unlink message and do
925 * not update queue parameters.
927 if (msgflg & MSG_COPY) {
928 msg = copy_msg(msg, copy);
932 list_del(&msg->m_list);
934 msq->q_rtime = get_seconds();
935 msq->q_lrpid = task_tgid_vnr(current);
936 msq->q_cbytes -= msg->m_ts;
937 atomic_sub(msg->m_ts, &ns->msg_bytes);
938 atomic_dec(&ns->msg_hdrs);
939 ss_wakeup(msq, &wake_q, false);
944 /* No message waiting. Wait for a message */
945 if (msgflg & IPC_NOWAIT) {
946 msg = ERR_PTR(-ENOMSG);
950 list_add_tail(&msr_d.r_list, &msq->q_receivers);
951 msr_d.r_tsk = current;
952 msr_d.r_msgtype = msgtyp;
954 if (msgflg & MSG_NOERROR)
955 msr_d.r_maxsize = INT_MAX;
957 msr_d.r_maxsize = bufsz;
958 msr_d.r_msg = ERR_PTR(-EAGAIN);
959 __set_current_state(TASK_INTERRUPTIBLE);
961 ipc_unlock_object(&msq->q_perm);
966 * Lockless receive, part 1:
967 * We don't hold a reference to the queue and getting a
968 * reference would defeat the idea of a lockless operation,
969 * thus the code relies on rcu to guarantee the existence of
971 * Prior to destruction, expunge_all(-EIRDM) changes r_msg.
972 * Thus if r_msg is -EAGAIN, then the queue not yet destroyed.
977 * Lockless receive, part 2:
978 * The work in pipelined_send() and expunge_all():
979 * - Set pointer to message
980 * - Queue the receiver task for later wakeup
981 * - Wake up the process after the lock is dropped.
983 * Should the process wake up before this wakeup (due to a
984 * signal) it will either see the message and continue ...
986 msg = READ_ONCE(msr_d.r_msg);
987 if (msg != ERR_PTR(-EAGAIN))
991 * ... or see -EAGAIN, acquire the lock to check the message
994 ipc_lock_object(&msq->q_perm);
997 if (msg != ERR_PTR(-EAGAIN))
1000 list_del(&msr_d.r_list);
1001 if (signal_pending(current)) {
1002 msg = ERR_PTR(-ERESTARTNOHAND);
1006 ipc_unlock_object(&msq->q_perm);
1010 ipc_unlock_object(&msq->q_perm);
1016 return PTR_ERR(msg);
1019 bufsz = msg_handler(buf, msg, bufsz);
1025 SYSCALL_DEFINE5(msgrcv, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz,
1026 long, msgtyp, int, msgflg)
1028 return do_msgrcv(msqid, msgp, msgsz, msgtyp, msgflg, do_msg_fill);
1032 void msg_init_ns(struct ipc_namespace *ns)
1034 ns->msg_ctlmax = MSGMAX;
1035 ns->msg_ctlmnb = MSGMNB;
1036 ns->msg_ctlmni = MSGMNI;
1038 atomic_set(&ns->msg_bytes, 0);
1039 atomic_set(&ns->msg_hdrs, 0);
1040 ipc_init_ids(&ns->ids[IPC_MSG_IDS]);
1043 #ifdef CONFIG_IPC_NS
1044 void msg_exit_ns(struct ipc_namespace *ns)
1046 free_ipcs(ns, &msg_ids(ns), freeque);
1047 idr_destroy(&ns->ids[IPC_MSG_IDS].ipcs_idr);
1051 #ifdef CONFIG_PROC_FS
1052 static int sysvipc_msg_proc_show(struct seq_file *s, void *it)
1054 struct user_namespace *user_ns = seq_user_ns(s);
1055 struct msg_queue *msq = it;
1058 "%10d %10d %4o %10lu %10lu %5u %5u %5u %5u %5u %5u %10lu %10lu %10lu\n",
1066 from_kuid_munged(user_ns, msq->q_perm.uid),
1067 from_kgid_munged(user_ns, msq->q_perm.gid),
1068 from_kuid_munged(user_ns, msq->q_perm.cuid),
1069 from_kgid_munged(user_ns, msq->q_perm.cgid),
1078 void __init msg_init(void)
1080 msg_init_ns(&init_ipc_ns);
1082 ipc_init_proc_interface("sysvipc/msg",
1083 " key msqid perms cbytes qnum lspid lrpid uid gid cuid cgid stime rtime ctime\n",
1084 IPC_MSG_IDS, sysvipc_msg_proc_show);