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 <asm/uaccess.h>
46 * one msg_receiver structure for each sleeping receiver:
49 struct list_head r_list;
50 struct task_struct *r_tsk;
56 struct msg_msg *volatile r_msg;
59 /* one msg_sender for each sleeping sender */
61 struct list_head list;
62 struct task_struct *tsk;
66 #define SEARCH_EQUAL 2
67 #define SEARCH_NOTEQUAL 3
68 #define SEARCH_LESSEQUAL 4
69 #define SEARCH_NUMBER 5
71 #define msg_ids(ns) ((ns)->ids[IPC_MSG_IDS])
73 static void freeque(struct ipc_namespace *, struct kern_ipc_perm *);
74 static int newque(struct ipc_namespace *, struct ipc_params *);
76 static int sysvipc_msg_proc_show(struct seq_file *s, void *it);
80 * Scale msgmni with the available lowmem size: the memory dedicated to msg
81 * queues should occupy at most 1/MSG_MEM_SCALE of lowmem.
82 * Also take into account the number of nsproxies created so far.
83 * This should be done staying within the (MSGMNI , IPCMNI/nr_ipc_ns) range.
85 void recompute_msgmni(struct ipc_namespace *ns)
88 unsigned long allowed;
92 allowed = (((i.totalram - i.totalhigh) / MSG_MEM_SCALE) * i.mem_unit)
94 nb_ns = atomic_read(&nr_ipc_ns);
97 if (allowed < MSGMNI) {
98 ns->msg_ctlmni = MSGMNI;
102 if (allowed > IPCMNI / nb_ns) {
103 ns->msg_ctlmni = IPCMNI / nb_ns;
107 ns->msg_ctlmni = allowed;
110 void msg_init_ns(struct ipc_namespace *ns)
112 ns->msg_ctlmax = MSGMAX;
113 ns->msg_ctlmnb = MSGMNB;
115 recompute_msgmni(ns);
117 atomic_set(&ns->msg_bytes, 0);
118 atomic_set(&ns->msg_hdrs, 0);
119 ipc_init_ids(&ns->ids[IPC_MSG_IDS]);
123 void msg_exit_ns(struct ipc_namespace *ns)
125 free_ipcs(ns, &msg_ids(ns), freeque);
126 idr_destroy(&ns->ids[IPC_MSG_IDS].ipcs_idr);
130 void __init msg_init(void)
132 msg_init_ns(&init_ipc_ns);
134 printk(KERN_INFO "msgmni has been set to %d\n",
135 init_ipc_ns.msg_ctlmni);
137 ipc_init_proc_interface("sysvipc/msg",
138 " key msqid perms cbytes qnum lspid lrpid uid gid cuid cgid stime rtime ctime\n",
139 IPC_MSG_IDS, sysvipc_msg_proc_show);
142 static inline struct msg_queue *msq_obtain_object(struct ipc_namespace *ns, int id)
144 struct kern_ipc_perm *ipcp = ipc_obtain_object(&msg_ids(ns), id);
147 return ERR_CAST(ipcp);
149 return container_of(ipcp, struct msg_queue, q_perm);
152 static inline struct msg_queue *msq_obtain_object_check(struct ipc_namespace *ns,
155 struct kern_ipc_perm *ipcp = ipc_obtain_object_check(&msg_ids(ns), id);
158 return ERR_CAST(ipcp);
160 return container_of(ipcp, struct msg_queue, q_perm);
163 static inline void msg_rmid(struct ipc_namespace *ns, struct msg_queue *s)
165 ipc_rmid(&msg_ids(ns), &s->q_perm);
169 * newque - Create a new msg queue
171 * @params: ptr to the structure that contains the key and msgflg
173 * Called with msg_ids.rwsem held (writer)
175 static int newque(struct ipc_namespace *ns, struct ipc_params *params)
177 struct msg_queue *msq;
179 key_t key = params->key;
180 int msgflg = params->flg;
182 msq = ipc_rcu_alloc(sizeof(*msq));
186 msq->q_perm.mode = msgflg & S_IRWXUGO;
187 msq->q_perm.key = key;
189 msq->q_perm.security = NULL;
190 retval = security_msg_queue_alloc(msq);
196 /* ipc_addid() locks msq upon success. */
197 id = ipc_addid(&msg_ids(ns), &msq->q_perm, ns->msg_ctlmni);
199 security_msg_queue_free(msq);
204 msq->q_stime = msq->q_rtime = 0;
205 msq->q_ctime = get_seconds();
206 msq->q_cbytes = msq->q_qnum = 0;
207 msq->q_qbytes = ns->msg_ctlmnb;
208 msq->q_lspid = msq->q_lrpid = 0;
209 INIT_LIST_HEAD(&msq->q_messages);
210 INIT_LIST_HEAD(&msq->q_receivers);
211 INIT_LIST_HEAD(&msq->q_senders);
213 ipc_unlock_object(&msq->q_perm);
216 return msq->q_perm.id;
219 static inline void ss_add(struct msg_queue *msq, struct msg_sender *mss)
222 current->state = TASK_INTERRUPTIBLE;
223 list_add_tail(&mss->list, &msq->q_senders);
226 static inline void ss_del(struct msg_sender *mss)
228 if (mss->list.next != NULL)
229 list_del(&mss->list);
232 static void ss_wakeup(struct list_head *h, int kill)
234 struct msg_sender *mss, *t;
236 list_for_each_entry_safe(mss, t, h, list) {
238 mss->list.next = NULL;
239 wake_up_process(mss->tsk);
243 static void expunge_all(struct msg_queue *msq, int res)
245 struct msg_receiver *msr, *t;
247 list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) {
249 wake_up_process(msr->r_tsk);
251 msr->r_msg = ERR_PTR(res);
256 * freeque() wakes up waiters on the sender and receiver waiting queue,
257 * removes the message queue from message queue ID IDR, and cleans up all the
258 * messages associated with this queue.
260 * msg_ids.rwsem (writer) and the spinlock for this message queue are held
261 * before freeque() is called. msg_ids.rwsem remains locked on exit.
263 static void freeque(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp)
265 struct msg_msg *msg, *t;
266 struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm);
268 expunge_all(msq, -EIDRM);
269 ss_wakeup(&msq->q_senders, 1);
271 ipc_unlock_object(&msq->q_perm);
274 list_for_each_entry_safe(msg, t, &msq->q_messages, m_list) {
275 atomic_dec(&ns->msg_hdrs);
278 atomic_sub(msq->q_cbytes, &ns->msg_bytes);
279 security_msg_queue_free(msq);
284 * Called with msg_ids.rwsem and ipcp locked.
286 static inline int msg_security(struct kern_ipc_perm *ipcp, int msgflg)
288 struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm);
290 return security_msg_queue_associate(msq, msgflg);
293 SYSCALL_DEFINE2(msgget, key_t, key, int, msgflg)
295 struct ipc_namespace *ns;
296 struct ipc_ops msg_ops;
297 struct ipc_params msg_params;
299 ns = current->nsproxy->ipc_ns;
301 msg_ops.getnew = newque;
302 msg_ops.associate = msg_security;
303 msg_ops.more_checks = NULL;
305 msg_params.key = key;
306 msg_params.flg = msgflg;
308 return ipcget(ns, &msg_ids(ns), &msg_ops, &msg_params);
311 static inline unsigned long
312 copy_msqid_to_user(void __user *buf, struct msqid64_ds *in, int version)
316 return copy_to_user(buf, in, sizeof(*in));
321 memset(&out, 0, sizeof(out));
323 ipc64_perm_to_ipc_perm(&in->msg_perm, &out.msg_perm);
325 out.msg_stime = in->msg_stime;
326 out.msg_rtime = in->msg_rtime;
327 out.msg_ctime = in->msg_ctime;
329 if (in->msg_cbytes > USHRT_MAX)
330 out.msg_cbytes = USHRT_MAX;
332 out.msg_cbytes = in->msg_cbytes;
333 out.msg_lcbytes = in->msg_cbytes;
335 if (in->msg_qnum > USHRT_MAX)
336 out.msg_qnum = USHRT_MAX;
338 out.msg_qnum = in->msg_qnum;
340 if (in->msg_qbytes > USHRT_MAX)
341 out.msg_qbytes = USHRT_MAX;
343 out.msg_qbytes = in->msg_qbytes;
344 out.msg_lqbytes = in->msg_qbytes;
346 out.msg_lspid = in->msg_lspid;
347 out.msg_lrpid = in->msg_lrpid;
349 return copy_to_user(buf, &out, sizeof(out));
356 static inline unsigned long
357 copy_msqid_from_user(struct msqid64_ds *out, void __user *buf, int version)
361 if (copy_from_user(out, buf, sizeof(*out)))
366 struct msqid_ds tbuf_old;
368 if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old)))
371 out->msg_perm.uid = tbuf_old.msg_perm.uid;
372 out->msg_perm.gid = tbuf_old.msg_perm.gid;
373 out->msg_perm.mode = tbuf_old.msg_perm.mode;
375 if (tbuf_old.msg_qbytes == 0)
376 out->msg_qbytes = tbuf_old.msg_lqbytes;
378 out->msg_qbytes = tbuf_old.msg_qbytes;
388 * This function handles some msgctl commands which require the rwsem
389 * to be held in write mode.
390 * NOTE: no locks must be held, the rwsem is taken inside this function.
392 static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd,
393 struct msqid_ds __user *buf, int version)
395 struct kern_ipc_perm *ipcp;
396 struct msqid64_ds uninitialized_var(msqid64);
397 struct msg_queue *msq;
400 if (cmd == IPC_SET) {
401 if (copy_msqid_from_user(&msqid64, buf, version))
405 down_write(&msg_ids(ns).rwsem);
408 ipcp = ipcctl_pre_down_nolock(ns, &msg_ids(ns), msqid, cmd,
409 &msqid64.msg_perm, msqid64.msg_qbytes);
415 msq = container_of(ipcp, struct msg_queue, q_perm);
417 err = security_msg_queue_msgctl(msq, cmd);
423 ipc_lock_object(&msq->q_perm);
424 /* freeque unlocks the ipc object and rcu */
428 if (msqid64.msg_qbytes > ns->msg_ctlmnb &&
429 !capable(CAP_SYS_RESOURCE)) {
434 ipc_lock_object(&msq->q_perm);
435 err = ipc_update_perm(&msqid64.msg_perm, ipcp);
439 msq->q_qbytes = msqid64.msg_qbytes;
441 msq->q_ctime = get_seconds();
442 /* sleeping receivers might be excluded by
443 * stricter permissions.
445 expunge_all(msq, -EAGAIN);
446 /* sleeping senders might be able to send
447 * due to a larger queue size.
449 ss_wakeup(&msq->q_senders, 0);
457 ipc_unlock_object(&msq->q_perm);
461 up_write(&msg_ids(ns).rwsem);
465 static int msgctl_nolock(struct ipc_namespace *ns, int msqid,
466 int cmd, int version, void __user *buf)
469 struct msg_queue *msq;
475 struct msginfo msginfo;
482 * We must not return kernel stack data.
483 * due to padding, it's not enough
484 * to set all member fields.
486 err = security_msg_queue_msgctl(NULL, cmd);
490 memset(&msginfo, 0, sizeof(msginfo));
491 msginfo.msgmni = ns->msg_ctlmni;
492 msginfo.msgmax = ns->msg_ctlmax;
493 msginfo.msgmnb = ns->msg_ctlmnb;
494 msginfo.msgssz = MSGSSZ;
495 msginfo.msgseg = MSGSEG;
496 down_read(&msg_ids(ns).rwsem);
497 if (cmd == MSG_INFO) {
498 msginfo.msgpool = msg_ids(ns).in_use;
499 msginfo.msgmap = atomic_read(&ns->msg_hdrs);
500 msginfo.msgtql = atomic_read(&ns->msg_bytes);
502 msginfo.msgmap = MSGMAP;
503 msginfo.msgpool = MSGPOOL;
504 msginfo.msgtql = MSGTQL;
506 max_id = ipc_get_maxid(&msg_ids(ns));
507 up_read(&msg_ids(ns).rwsem);
508 if (copy_to_user(buf, &msginfo, sizeof(struct msginfo)))
510 return (max_id < 0) ? 0 : max_id;
516 struct msqid64_ds tbuf;
522 memset(&tbuf, 0, sizeof(tbuf));
525 if (cmd == MSG_STAT) {
526 msq = msq_obtain_object(ns, msqid);
531 success_return = msq->q_perm.id;
533 msq = msq_obtain_object_check(ns, msqid);
542 if (ipcperms(ns, &msq->q_perm, S_IRUGO))
545 err = security_msg_queue_msgctl(msq, cmd);
549 kernel_to_ipc64_perm(&msq->q_perm, &tbuf.msg_perm);
550 tbuf.msg_stime = msq->q_stime;
551 tbuf.msg_rtime = msq->q_rtime;
552 tbuf.msg_ctime = msq->q_ctime;
553 tbuf.msg_cbytes = msq->q_cbytes;
554 tbuf.msg_qnum = msq->q_qnum;
555 tbuf.msg_qbytes = msq->q_qbytes;
556 tbuf.msg_lspid = msq->q_lspid;
557 tbuf.msg_lrpid = msq->q_lrpid;
560 if (copy_msqid_to_user(buf, &tbuf, version))
562 return success_return;
575 SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, struct msqid_ds __user *, buf)
578 struct ipc_namespace *ns;
580 if (msqid < 0 || cmd < 0)
583 version = ipc_parse_version(&cmd);
584 ns = current->nsproxy->ipc_ns;
589 case MSG_STAT: /* msqid is an index rather than a msg queue id */
591 return msgctl_nolock(ns, msqid, cmd, version, buf);
594 return msgctl_down(ns, msqid, cmd, buf, version);
600 static int testmsg(struct msg_msg *msg, long type, int mode)
607 case SEARCH_LESSEQUAL:
608 if (msg->m_type <=type)
612 if (msg->m_type == type)
615 case SEARCH_NOTEQUAL:
616 if (msg->m_type != type)
623 static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg)
625 struct msg_receiver *msr, *t;
627 list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) {
628 if (testmsg(msg, msr->r_msgtype, msr->r_mode) &&
629 !security_msg_queue_msgrcv(msq, msg, msr->r_tsk,
630 msr->r_msgtype, msr->r_mode)) {
632 list_del(&msr->r_list);
633 if (msr->r_maxsize < msg->m_ts) {
635 wake_up_process(msr->r_tsk);
637 msr->r_msg = ERR_PTR(-E2BIG);
640 msq->q_lrpid = task_pid_vnr(msr->r_tsk);
641 msq->q_rtime = get_seconds();
642 wake_up_process(msr->r_tsk);
653 long do_msgsnd(int msqid, long mtype, void __user *mtext,
654 size_t msgsz, int msgflg)
656 struct msg_queue *msq;
659 struct ipc_namespace *ns;
661 ns = current->nsproxy->ipc_ns;
663 if (msgsz > ns->msg_ctlmax || (long) msgsz < 0 || msqid < 0)
668 msg = load_msg(mtext, msgsz);
676 msq = msq_obtain_object_check(ns, msqid);
682 ipc_lock_object(&msq->q_perm);
688 if (ipcperms(ns, &msq->q_perm, S_IWUGO))
691 err = security_msg_queue_msgsnd(msq, msg, msgflg);
695 if (msgsz + msq->q_cbytes <= msq->q_qbytes &&
696 1 + msq->q_qnum <= msq->q_qbytes) {
700 /* queue full, wait: */
701 if (msgflg & IPC_NOWAIT) {
708 if (!ipc_rcu_getref(msq)) {
713 ipc_unlock_object(&msq->q_perm);
718 ipc_lock_object(&msq->q_perm);
721 if (msq->q_perm.deleted) {
728 if (signal_pending(current)) {
729 err = -ERESTARTNOHAND;
734 msq->q_lspid = task_tgid_vnr(current);
735 msq->q_stime = get_seconds();
737 if (!pipelined_send(msq, msg)) {
738 /* no one is waiting for this message, enqueue it */
739 list_add_tail(&msg->m_list, &msq->q_messages);
740 msq->q_cbytes += msgsz;
742 atomic_add(msgsz, &ns->msg_bytes);
743 atomic_inc(&ns->msg_hdrs);
750 ipc_unlock_object(&msq->q_perm);
758 SYSCALL_DEFINE4(msgsnd, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz,
763 if (get_user(mtype, &msgp->mtype))
765 return do_msgsnd(msqid, mtype, msgp->mtext, msgsz, msgflg);
768 static inline int convert_mode(long *msgtyp, int msgflg)
770 if (msgflg & MSG_COPY)
771 return SEARCH_NUMBER;
773 * find message of correct type.
774 * msgtyp = 0 => get first.
775 * msgtyp > 0 => get first message of matching type.
776 * msgtyp < 0 => get message with least type must be < abs(msgtype).
782 return SEARCH_LESSEQUAL;
784 if (msgflg & MSG_EXCEPT)
785 return SEARCH_NOTEQUAL;
789 static long do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz)
791 struct msgbuf __user *msgp = dest;
794 if (put_user(msg->m_type, &msgp->mtype))
797 msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz;
798 if (store_msg(msgp->mtext, msg, msgsz))
803 #ifdef CONFIG_CHECKPOINT_RESTORE
805 * This function creates new kernel message structure, large enough to store
806 * bufsz message bytes.
808 static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz)
810 struct msg_msg *copy;
813 * Create dummy message to copy real message to.
815 copy = load_msg(buf, bufsz);
821 static inline void free_copy(struct msg_msg *copy)
827 static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz)
829 return ERR_PTR(-ENOSYS);
832 static inline void free_copy(struct msg_msg *copy)
837 static struct msg_msg *find_msg(struct msg_queue *msq, long *msgtyp, int mode)
839 struct msg_msg *msg, *found = NULL;
842 list_for_each_entry(msg, &msq->q_messages, m_list) {
843 if (testmsg(msg, *msgtyp, mode) &&
844 !security_msg_queue_msgrcv(msq, msg, current,
846 if (mode == SEARCH_LESSEQUAL && msg->m_type != 1) {
847 *msgtyp = msg->m_type - 1;
849 } else if (mode == SEARCH_NUMBER) {
850 if (*msgtyp == count)
858 return found ?: ERR_PTR(-EAGAIN);
861 long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, int msgflg,
862 long (*msg_handler)(void __user *, struct msg_msg *, size_t))
865 struct msg_queue *msq;
866 struct ipc_namespace *ns;
867 struct msg_msg *msg, *copy = NULL;
869 ns = current->nsproxy->ipc_ns;
871 if (msqid < 0 || (long) bufsz < 0)
874 if (msgflg & MSG_COPY) {
875 copy = prepare_copy(buf, min_t(size_t, bufsz, ns->msg_ctlmax));
877 return PTR_ERR(copy);
879 mode = convert_mode(&msgtyp, msgflg);
882 msq = msq_obtain_object_check(ns, msqid);
890 struct msg_receiver msr_d;
892 msg = ERR_PTR(-EACCES);
893 if (ipcperms(ns, &msq->q_perm, S_IRUGO))
896 ipc_lock_object(&msq->q_perm);
897 msg = find_msg(msq, &msgtyp, mode);
900 * Found a suitable message.
901 * Unlink it from the queue.
903 if ((bufsz < msg->m_ts) && !(msgflg & MSG_NOERROR)) {
904 msg = ERR_PTR(-E2BIG);
908 * If we are copying, then do not unlink message and do
909 * not update queue parameters.
911 if (msgflg & MSG_COPY) {
912 msg = copy_msg(msg, copy);
916 list_del(&msg->m_list);
918 msq->q_rtime = get_seconds();
919 msq->q_lrpid = task_tgid_vnr(current);
920 msq->q_cbytes -= msg->m_ts;
921 atomic_sub(msg->m_ts, &ns->msg_bytes);
922 atomic_dec(&ns->msg_hdrs);
923 ss_wakeup(&msq->q_senders, 0);
928 /* No message waiting. Wait for a message */
929 if (msgflg & IPC_NOWAIT) {
930 msg = ERR_PTR(-ENOMSG);
934 list_add_tail(&msr_d.r_list, &msq->q_receivers);
935 msr_d.r_tsk = current;
936 msr_d.r_msgtype = msgtyp;
938 if (msgflg & MSG_NOERROR)
939 msr_d.r_maxsize = INT_MAX;
941 msr_d.r_maxsize = bufsz;
942 msr_d.r_msg = ERR_PTR(-EAGAIN);
943 current->state = TASK_INTERRUPTIBLE;
945 ipc_unlock_object(&msq->q_perm);
949 /* Lockless receive, part 1:
950 * Disable preemption. We don't hold a reference to the queue
951 * and getting a reference would defeat the idea of a lockless
952 * operation, thus the code relies on rcu to guarantee the
954 * Prior to destruction, expunge_all(-EIRDM) changes r_msg.
955 * Thus if r_msg is -EAGAIN, then the queue not yet destroyed.
956 * rcu_read_lock() prevents preemption between reading r_msg
957 * and acquiring the q_perm.lock in ipc_lock_object().
961 /* Lockless receive, part 2:
962 * Wait until pipelined_send or expunge_all are outside of
963 * wake_up_process(). There is a race with exit(), see
964 * ipc/mqueue.c for the details.
966 msg = (struct msg_msg*)msr_d.r_msg;
967 while (msg == NULL) {
969 msg = (struct msg_msg *)msr_d.r_msg;
972 /* Lockless receive, part 3:
973 * If there is a message or an error then accept it without
976 if (msg != ERR_PTR(-EAGAIN))
979 /* Lockless receive, part 3:
980 * Acquire the queue spinlock.
982 ipc_lock_object(&msq->q_perm);
984 /* Lockless receive, part 4:
985 * Repeat test after acquiring the spinlock.
987 msg = (struct msg_msg*)msr_d.r_msg;
988 if (msg != ERR_PTR(-EAGAIN))
991 list_del(&msr_d.r_list);
992 if (signal_pending(current)) {
993 msg = ERR_PTR(-ERESTARTNOHAND);
997 ipc_unlock_object(&msq->q_perm);
1001 ipc_unlock_object(&msq->q_perm);
1006 return PTR_ERR(msg);
1009 bufsz = msg_handler(buf, msg, bufsz);
1015 SYSCALL_DEFINE5(msgrcv, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz,
1016 long, msgtyp, int, msgflg)
1018 return do_msgrcv(msqid, msgp, msgsz, msgtyp, msgflg, do_msg_fill);
1021 #ifdef CONFIG_PROC_FS
1022 static int sysvipc_msg_proc_show(struct seq_file *s, void *it)
1024 struct user_namespace *user_ns = seq_user_ns(s);
1025 struct msg_queue *msq = it;
1027 return seq_printf(s,
1028 "%10d %10d %4o %10lu %10lu %5u %5u %5u %5u %5u %5u %10lu %10lu %10lu\n",
1036 from_kuid_munged(user_ns, msq->q_perm.uid),
1037 from_kgid_munged(user_ns, msq->q_perm.gid),
1038 from_kuid_munged(user_ns, msq->q_perm.cuid),
1039 from_kgid_munged(user_ns, msq->q_perm.cgid),