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 #define msg_unlock(msq) ipc_unlock(&(msq)->q_perm)
75 static void freeque(struct ipc_namespace *, struct kern_ipc_perm *);
76 static int newque(struct ipc_namespace *, struct ipc_params *);
78 static int sysvipc_msg_proc_show(struct seq_file *s, void *it);
82 * Scale msgmni with the available lowmem size: the memory dedicated to msg
83 * queues should occupy at most 1/MSG_MEM_SCALE of lowmem.
84 * Also take into account the number of nsproxies created so far.
85 * This should be done staying within the (MSGMNI , IPCMNI/nr_ipc_ns) range.
87 void recompute_msgmni(struct ipc_namespace *ns)
90 unsigned long allowed;
94 allowed = (((i.totalram - i.totalhigh) / MSG_MEM_SCALE) * i.mem_unit)
96 nb_ns = atomic_read(&nr_ipc_ns);
99 if (allowed < MSGMNI) {
100 ns->msg_ctlmni = MSGMNI;
104 if (allowed > IPCMNI / nb_ns) {
105 ns->msg_ctlmni = IPCMNI / nb_ns;
109 ns->msg_ctlmni = allowed;
112 void msg_init_ns(struct ipc_namespace *ns)
114 ns->msg_ctlmax = MSGMAX;
115 ns->msg_ctlmnb = MSGMNB;
117 recompute_msgmni(ns);
119 atomic_set(&ns->msg_bytes, 0);
120 atomic_set(&ns->msg_hdrs, 0);
121 ipc_init_ids(&ns->ids[IPC_MSG_IDS]);
125 void msg_exit_ns(struct ipc_namespace *ns)
127 free_ipcs(ns, &msg_ids(ns), freeque);
128 idr_destroy(&ns->ids[IPC_MSG_IDS].ipcs_idr);
132 void __init msg_init(void)
134 msg_init_ns(&init_ipc_ns);
136 printk(KERN_INFO "msgmni has been set to %d\n",
137 init_ipc_ns.msg_ctlmni);
139 ipc_init_proc_interface("sysvipc/msg",
140 " key msqid perms cbytes qnum lspid lrpid uid gid cuid cgid stime rtime ctime\n",
141 IPC_MSG_IDS, sysvipc_msg_proc_show);
144 static inline struct msg_queue *msq_obtain_object(struct ipc_namespace *ns, int id)
146 struct kern_ipc_perm *ipcp = ipc_obtain_object(&msg_ids(ns), id);
149 return ERR_CAST(ipcp);
151 return container_of(ipcp, struct msg_queue, q_perm);
154 static inline struct msg_queue *msq_obtain_object_check(struct ipc_namespace *ns,
157 struct kern_ipc_perm *ipcp = ipc_obtain_object_check(&msg_ids(ns), id);
160 return ERR_CAST(ipcp);
162 return container_of(ipcp, struct msg_queue, q_perm);
165 static inline void msg_rmid(struct ipc_namespace *ns, struct msg_queue *s)
167 ipc_rmid(&msg_ids(ns), &s->q_perm);
171 * newque - Create a new msg queue
173 * @params: ptr to the structure that contains the key and msgflg
175 * Called with msg_ids.rw_mutex held (writer)
177 static int newque(struct ipc_namespace *ns, struct ipc_params *params)
179 struct msg_queue *msq;
181 key_t key = params->key;
182 int msgflg = params->flg;
184 msq = ipc_rcu_alloc(sizeof(*msq));
188 msq->q_perm.mode = msgflg & S_IRWXUGO;
189 msq->q_perm.key = key;
191 msq->q_perm.security = NULL;
192 retval = security_msg_queue_alloc(msq);
198 /* ipc_addid() locks msq upon success. */
200 id = ipc_addid(&msg_ids(ns), &msq->q_perm, ns->msg_ctlmni);
203 security_msg_queue_free(msq);
208 msq->q_stime = msq->q_rtime = 0;
209 msq->q_ctime = get_seconds();
210 msq->q_cbytes = msq->q_qnum = 0;
211 msq->q_qbytes = ns->msg_ctlmnb;
212 msq->q_lspid = msq->q_lrpid = 0;
213 INIT_LIST_HEAD(&msq->q_messages);
214 INIT_LIST_HEAD(&msq->q_receivers);
215 INIT_LIST_HEAD(&msq->q_senders);
217 ipc_unlock_object(&msq->q_perm);
220 return msq->q_perm.id;
223 static inline void ss_add(struct msg_queue *msq, struct msg_sender *mss)
226 current->state = TASK_INTERRUPTIBLE;
227 list_add_tail(&mss->list, &msq->q_senders);
230 static inline void ss_del(struct msg_sender *mss)
232 if (mss->list.next != NULL)
233 list_del(&mss->list);
236 static void ss_wakeup(struct list_head *h, int kill)
238 struct msg_sender *mss, *t;
240 list_for_each_entry_safe(mss, t, h, list) {
242 mss->list.next = NULL;
243 wake_up_process(mss->tsk);
247 static void expunge_all(struct msg_queue *msq, int res)
249 struct msg_receiver *msr, *t;
251 list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) {
253 wake_up_process(msr->r_tsk);
255 msr->r_msg = ERR_PTR(res);
260 * freeque() wakes up waiters on the sender and receiver waiting queue,
261 * removes the message queue from message queue ID IDR, and cleans up all the
262 * messages associated with this queue.
264 * msg_ids.rw_mutex (writer) and the spinlock for this message queue are held
265 * before freeque() is called. msg_ids.rw_mutex remains locked on exit.
267 static void freeque(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp)
269 struct msg_msg *msg, *t;
270 struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm);
272 expunge_all(msq, -EIDRM);
273 ss_wakeup(&msq->q_senders, 1);
277 list_for_each_entry_safe(msg, t, &msq->q_messages, m_list) {
278 atomic_dec(&ns->msg_hdrs);
281 atomic_sub(msq->q_cbytes, &ns->msg_bytes);
282 security_msg_queue_free(msq);
287 * Called with msg_ids.rw_mutex and ipcp locked.
289 static inline int msg_security(struct kern_ipc_perm *ipcp, int msgflg)
291 struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm);
293 return security_msg_queue_associate(msq, msgflg);
296 SYSCALL_DEFINE2(msgget, key_t, key, int, msgflg)
298 struct ipc_namespace *ns;
299 struct ipc_ops msg_ops;
300 struct ipc_params msg_params;
302 ns = current->nsproxy->ipc_ns;
304 msg_ops.getnew = newque;
305 msg_ops.associate = msg_security;
306 msg_ops.more_checks = NULL;
308 msg_params.key = key;
309 msg_params.flg = msgflg;
311 return ipcget(ns, &msg_ids(ns), &msg_ops, &msg_params);
314 static inline unsigned long
315 copy_msqid_to_user(void __user *buf, struct msqid64_ds *in, int version)
319 return copy_to_user(buf, in, sizeof(*in));
324 memset(&out, 0, sizeof(out));
326 ipc64_perm_to_ipc_perm(&in->msg_perm, &out.msg_perm);
328 out.msg_stime = in->msg_stime;
329 out.msg_rtime = in->msg_rtime;
330 out.msg_ctime = in->msg_ctime;
332 if (in->msg_cbytes > USHRT_MAX)
333 out.msg_cbytes = USHRT_MAX;
335 out.msg_cbytes = in->msg_cbytes;
336 out.msg_lcbytes = in->msg_cbytes;
338 if (in->msg_qnum > USHRT_MAX)
339 out.msg_qnum = USHRT_MAX;
341 out.msg_qnum = in->msg_qnum;
343 if (in->msg_qbytes > USHRT_MAX)
344 out.msg_qbytes = USHRT_MAX;
346 out.msg_qbytes = in->msg_qbytes;
347 out.msg_lqbytes = in->msg_qbytes;
349 out.msg_lspid = in->msg_lspid;
350 out.msg_lrpid = in->msg_lrpid;
352 return copy_to_user(buf, &out, sizeof(out));
359 static inline unsigned long
360 copy_msqid_from_user(struct msqid64_ds *out, void __user *buf, int version)
364 if (copy_from_user(out, buf, sizeof(*out)))
369 struct msqid_ds tbuf_old;
371 if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old)))
374 out->msg_perm.uid = tbuf_old.msg_perm.uid;
375 out->msg_perm.gid = tbuf_old.msg_perm.gid;
376 out->msg_perm.mode = tbuf_old.msg_perm.mode;
378 if (tbuf_old.msg_qbytes == 0)
379 out->msg_qbytes = tbuf_old.msg_lqbytes;
381 out->msg_qbytes = tbuf_old.msg_qbytes;
391 * This function handles some msgctl commands which require the rw_mutex
392 * to be held in write mode.
393 * NOTE: no locks must be held, the rw_mutex is taken inside this function.
395 static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd,
396 struct msqid_ds __user *buf, int version)
398 struct kern_ipc_perm *ipcp;
399 struct msqid64_ds uninitialized_var(msqid64);
400 struct msg_queue *msq;
403 if (cmd == IPC_SET) {
404 if (copy_msqid_from_user(&msqid64, buf, version))
408 down_write(&msg_ids(ns).rw_mutex);
411 ipcp = ipcctl_pre_down_nolock(ns, &msg_ids(ns), msqid, cmd,
412 &msqid64.msg_perm, msqid64.msg_qbytes);
418 msq = container_of(ipcp, struct msg_queue, q_perm);
420 err = security_msg_queue_msgctl(msq, cmd);
426 ipc_lock_object(&msq->q_perm);
427 /* freeque unlocks the ipc object and rcu */
431 if (msqid64.msg_qbytes > ns->msg_ctlmnb &&
432 !capable(CAP_SYS_RESOURCE)) {
437 ipc_lock_object(&msq->q_perm);
438 err = ipc_update_perm(&msqid64.msg_perm, ipcp);
442 msq->q_qbytes = msqid64.msg_qbytes;
444 msq->q_ctime = get_seconds();
445 /* sleeping receivers might be excluded by
446 * stricter permissions.
448 expunge_all(msq, -EAGAIN);
449 /* sleeping senders might be able to send
450 * due to a larger queue size.
452 ss_wakeup(&msq->q_senders, 0);
460 ipc_unlock_object(&msq->q_perm);
464 up_write(&msg_ids(ns).rw_mutex);
468 static int msgctl_nolock(struct ipc_namespace *ns, int msqid,
469 int cmd, int version, void __user *buf)
472 struct msg_queue *msq;
478 struct msginfo msginfo;
485 * We must not return kernel stack data.
486 * due to padding, it's not enough
487 * to set all member fields.
489 err = security_msg_queue_msgctl(NULL, cmd);
493 memset(&msginfo, 0, sizeof(msginfo));
494 msginfo.msgmni = ns->msg_ctlmni;
495 msginfo.msgmax = ns->msg_ctlmax;
496 msginfo.msgmnb = ns->msg_ctlmnb;
497 msginfo.msgssz = MSGSSZ;
498 msginfo.msgseg = MSGSEG;
499 down_read(&msg_ids(ns).rw_mutex);
500 if (cmd == MSG_INFO) {
501 msginfo.msgpool = msg_ids(ns).in_use;
502 msginfo.msgmap = atomic_read(&ns->msg_hdrs);
503 msginfo.msgtql = atomic_read(&ns->msg_bytes);
505 msginfo.msgmap = MSGMAP;
506 msginfo.msgpool = MSGPOOL;
507 msginfo.msgtql = MSGTQL;
509 max_id = ipc_get_maxid(&msg_ids(ns));
510 up_read(&msg_ids(ns).rw_mutex);
511 if (copy_to_user(buf, &msginfo, sizeof(struct msginfo)))
513 return (max_id < 0) ? 0 : max_id;
519 struct msqid64_ds tbuf;
525 memset(&tbuf, 0, sizeof(tbuf));
528 if (cmd == MSG_STAT) {
529 msq = msq_obtain_object(ns, msqid);
534 success_return = msq->q_perm.id;
536 msq = msq_obtain_object_check(ns, msqid);
545 if (ipcperms(ns, &msq->q_perm, S_IRUGO))
548 err = security_msg_queue_msgctl(msq, cmd);
552 kernel_to_ipc64_perm(&msq->q_perm, &tbuf.msg_perm);
553 tbuf.msg_stime = msq->q_stime;
554 tbuf.msg_rtime = msq->q_rtime;
555 tbuf.msg_ctime = msq->q_ctime;
556 tbuf.msg_cbytes = msq->q_cbytes;
557 tbuf.msg_qnum = msq->q_qnum;
558 tbuf.msg_qbytes = msq->q_qbytes;
559 tbuf.msg_lspid = msq->q_lspid;
560 tbuf.msg_lrpid = msq->q_lrpid;
563 if (copy_msqid_to_user(buf, &tbuf, version))
565 return success_return;
578 SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, struct msqid_ds __user *, buf)
581 struct ipc_namespace *ns;
583 if (msqid < 0 || cmd < 0)
586 version = ipc_parse_version(&cmd);
587 ns = current->nsproxy->ipc_ns;
592 case MSG_STAT: /* msqid is an index rather than a msg queue id */
594 return msgctl_nolock(ns, msqid, cmd, version, buf);
597 return msgctl_down(ns, msqid, cmd, buf, version);
603 static int testmsg(struct msg_msg *msg, long type, int mode)
610 case SEARCH_LESSEQUAL:
611 if (msg->m_type <=type)
615 if (msg->m_type == type)
618 case SEARCH_NOTEQUAL:
619 if (msg->m_type != type)
626 static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg)
628 struct msg_receiver *msr, *t;
630 list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) {
631 if (testmsg(msg, msr->r_msgtype, msr->r_mode) &&
632 !security_msg_queue_msgrcv(msq, msg, msr->r_tsk,
633 msr->r_msgtype, msr->r_mode)) {
635 list_del(&msr->r_list);
636 if (msr->r_maxsize < msg->m_ts) {
638 wake_up_process(msr->r_tsk);
640 msr->r_msg = ERR_PTR(-E2BIG);
643 msq->q_lrpid = task_pid_vnr(msr->r_tsk);
644 msq->q_rtime = get_seconds();
645 wake_up_process(msr->r_tsk);
656 long do_msgsnd(int msqid, long mtype, void __user *mtext,
657 size_t msgsz, int msgflg)
659 struct msg_queue *msq;
662 struct ipc_namespace *ns;
664 ns = current->nsproxy->ipc_ns;
666 if (msgsz > ns->msg_ctlmax || (long) msgsz < 0 || msqid < 0)
671 msg = load_msg(mtext, msgsz);
679 msq = msq_obtain_object_check(ns, msqid);
689 if (ipcperms(ns, &msq->q_perm, S_IWUGO))
692 err = security_msg_queue_msgsnd(msq, msg, msgflg);
696 if (msgsz + msq->q_cbytes <= msq->q_qbytes &&
697 1 + msq->q_qnum <= msq->q_qbytes) {
701 /* queue full, wait: */
702 if (msgflg & IPC_NOWAIT) {
707 ipc_lock_object(&msq->q_perm);
710 if (!ipc_rcu_getref(msq)) {
715 ipc_unlock_object(&msq->q_perm);
720 ipc_lock_object(&msq->q_perm);
723 if (msq->q_perm.deleted) {
730 if (signal_pending(current)) {
731 err = -ERESTARTNOHAND;
735 ipc_unlock_object(&msq->q_perm);
738 ipc_lock_object(&msq->q_perm);
739 msq->q_lspid = task_tgid_vnr(current);
740 msq->q_stime = get_seconds();
742 if (!pipelined_send(msq, msg)) {
743 /* no one is waiting for this message, enqueue it */
744 list_add_tail(&msg->m_list, &msq->q_messages);
745 msq->q_cbytes += msgsz;
747 atomic_add(msgsz, &ns->msg_bytes);
748 atomic_inc(&ns->msg_hdrs);
755 ipc_unlock_object(&msq->q_perm);
763 SYSCALL_DEFINE4(msgsnd, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz,
768 if (get_user(mtype, &msgp->mtype))
770 return do_msgsnd(msqid, mtype, msgp->mtext, msgsz, msgflg);
773 static inline int convert_mode(long *msgtyp, int msgflg)
775 if (msgflg & MSG_COPY)
776 return SEARCH_NUMBER;
778 * find message of correct type.
779 * msgtyp = 0 => get first.
780 * msgtyp > 0 => get first message of matching type.
781 * msgtyp < 0 => get message with least type must be < abs(msgtype).
787 return SEARCH_LESSEQUAL;
789 if (msgflg & MSG_EXCEPT)
790 return SEARCH_NOTEQUAL;
794 static long do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz)
796 struct msgbuf __user *msgp = dest;
799 if (put_user(msg->m_type, &msgp->mtype))
802 msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz;
803 if (store_msg(msgp->mtext, msg, msgsz))
808 #ifdef CONFIG_CHECKPOINT_RESTORE
810 * This function creates new kernel message structure, large enough to store
811 * bufsz message bytes.
813 static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz)
815 struct msg_msg *copy;
818 * Create dummy message to copy real message to.
820 copy = load_msg(buf, bufsz);
826 static inline void free_copy(struct msg_msg *copy)
832 static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz)
834 return ERR_PTR(-ENOSYS);
837 static inline void free_copy(struct msg_msg *copy)
842 static struct msg_msg *find_msg(struct msg_queue *msq, long *msgtyp, int mode)
847 list_for_each_entry(msg, &msq->q_messages, m_list) {
848 if (testmsg(msg, *msgtyp, mode) &&
849 !security_msg_queue_msgrcv(msq, msg, current,
851 if (mode == SEARCH_LESSEQUAL && msg->m_type != 1) {
852 *msgtyp = msg->m_type - 1;
853 } else if (mode == SEARCH_NUMBER) {
854 if (*msgtyp == count)
862 return ERR_PTR(-EAGAIN);
865 long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, int msgflg,
866 long (*msg_handler)(void __user *, struct msg_msg *, size_t))
869 struct msg_queue *msq;
870 struct ipc_namespace *ns;
871 struct msg_msg *msg, *copy = NULL;
873 ns = current->nsproxy->ipc_ns;
875 if (msqid < 0 || (long) bufsz < 0)
878 if (msgflg & MSG_COPY) {
879 copy = prepare_copy(buf, min_t(size_t, bufsz, ns->msg_ctlmax));
881 return PTR_ERR(copy);
883 mode = convert_mode(&msgtyp, msgflg);
886 msq = msq_obtain_object_check(ns, msqid);
894 struct msg_receiver msr_d;
896 msg = ERR_PTR(-EACCES);
897 if (ipcperms(ns, &msq->q_perm, S_IRUGO))
900 msg = find_msg(msq, &msgtyp, mode);
903 * Found a suitable message.
904 * Unlink it from the queue.
906 if ((bufsz < msg->m_ts) && !(msgflg & MSG_NOERROR)) {
907 msg = ERR_PTR(-E2BIG);
911 * If we are copying, then do not unlink message and do
912 * not update queue parameters.
914 if (msgflg & MSG_COPY) {
915 msg = copy_msg(msg, copy);
919 ipc_lock_object(&msq->q_perm);
920 list_del(&msg->m_list);
922 msq->q_rtime = get_seconds();
923 msq->q_lrpid = task_tgid_vnr(current);
924 msq->q_cbytes -= msg->m_ts;
925 atomic_sub(msg->m_ts, &ns->msg_bytes);
926 atomic_dec(&ns->msg_hdrs);
927 ss_wakeup(&msq->q_senders, 0);
932 /* No message waiting. Wait for a message */
933 if (msgflg & IPC_NOWAIT) {
934 msg = ERR_PTR(-ENOMSG);
938 ipc_lock_object(&msq->q_perm);
939 list_add_tail(&msr_d.r_list, &msq->q_receivers);
940 msr_d.r_tsk = current;
941 msr_d.r_msgtype = msgtyp;
943 if (msgflg & MSG_NOERROR)
944 msr_d.r_maxsize = INT_MAX;
946 msr_d.r_maxsize = bufsz;
947 msr_d.r_msg = ERR_PTR(-EAGAIN);
948 current->state = TASK_INTERRUPTIBLE;
950 ipc_unlock_object(&msq->q_perm);
954 /* Lockless receive, part 1:
955 * Disable preemption. We don't hold a reference to the queue
956 * and getting a reference would defeat the idea of a lockless
957 * operation, thus the code relies on rcu to guarantee the
959 * Prior to destruction, expunge_all(-EIRDM) changes r_msg.
960 * Thus if r_msg is -EAGAIN, then the queue not yet destroyed.
961 * rcu_read_lock() prevents preemption between reading r_msg
962 * and the spin_lock() inside ipc_lock_by_ptr().
966 /* Lockless receive, part 2:
967 * Wait until pipelined_send or expunge_all are outside of
968 * wake_up_process(). There is a race with exit(), see
969 * ipc/mqueue.c for the details.
971 msg = (struct msg_msg*)msr_d.r_msg;
972 while (msg == NULL) {
974 msg = (struct msg_msg *)msr_d.r_msg;
977 /* Lockless receive, part 3:
978 * If there is a message or an error then accept it without
981 if (msg != ERR_PTR(-EAGAIN))
984 /* Lockless receive, part 3:
985 * Acquire the queue spinlock.
987 ipc_lock_object(&msq->q_perm);
989 /* Lockless receive, part 4:
990 * Repeat test after acquiring the spinlock.
992 msg = (struct msg_msg*)msr_d.r_msg;
993 if (msg != ERR_PTR(-EAGAIN))
996 list_del(&msr_d.r_list);
997 if (signal_pending(current)) {
998 msg = ERR_PTR(-ERESTARTNOHAND);
1002 ipc_unlock_object(&msq->q_perm);
1006 ipc_unlock_object(&msq->q_perm);
1011 return PTR_ERR(msg);
1014 bufsz = msg_handler(buf, msg, bufsz);
1020 SYSCALL_DEFINE5(msgrcv, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz,
1021 long, msgtyp, int, msgflg)
1023 return do_msgrcv(msqid, msgp, msgsz, msgtyp, msgflg, do_msg_fill);
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;
1032 return seq_printf(s,
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),