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);
145 * msg_lock_(check_) routines are called in the paths where the rw_mutex
148 static inline struct msg_queue *msg_lock(struct ipc_namespace *ns, int id)
150 struct kern_ipc_perm *ipcp = ipc_lock(&msg_ids(ns), id);
153 return (struct msg_queue *)ipcp;
155 return container_of(ipcp, struct msg_queue, q_perm);
158 static inline struct msg_queue *msg_lock_check(struct ipc_namespace *ns,
161 struct kern_ipc_perm *ipcp = ipc_lock_check(&msg_ids(ns), id);
164 return (struct msg_queue *)ipcp;
166 return container_of(ipcp, struct msg_queue, q_perm);
169 static inline void msg_rmid(struct ipc_namespace *ns, struct msg_queue *s)
171 ipc_rmid(&msg_ids(ns), &s->q_perm);
175 * newque - Create a new msg queue
177 * @params: ptr to the structure that contains the key and msgflg
179 * Called with msg_ids.rw_mutex held (writer)
181 static int newque(struct ipc_namespace *ns, struct ipc_params *params)
183 struct msg_queue *msq;
185 key_t key = params->key;
186 int msgflg = params->flg;
188 msq = ipc_rcu_alloc(sizeof(*msq));
192 msq->q_perm.mode = msgflg & S_IRWXUGO;
193 msq->q_perm.key = key;
195 msq->q_perm.security = NULL;
196 retval = security_msg_queue_alloc(msq);
203 * ipc_addid() locks msq
205 id = ipc_addid(&msg_ids(ns), &msq->q_perm, ns->msg_ctlmni);
207 security_msg_queue_free(msq);
212 msq->q_stime = msq->q_rtime = 0;
213 msq->q_ctime = get_seconds();
214 msq->q_cbytes = msq->q_qnum = 0;
215 msq->q_qbytes = ns->msg_ctlmnb;
216 msq->q_lspid = msq->q_lrpid = 0;
217 INIT_LIST_HEAD(&msq->q_messages);
218 INIT_LIST_HEAD(&msq->q_receivers);
219 INIT_LIST_HEAD(&msq->q_senders);
223 return msq->q_perm.id;
226 static inline void ss_add(struct msg_queue *msq, struct msg_sender *mss)
229 current->state = TASK_INTERRUPTIBLE;
230 list_add_tail(&mss->list, &msq->q_senders);
233 static inline void ss_del(struct msg_sender *mss)
235 if (mss->list.next != NULL)
236 list_del(&mss->list);
239 static void ss_wakeup(struct list_head *h, int kill)
241 struct list_head *tmp;
245 struct msg_sender *mss;
247 mss = list_entry(tmp, struct msg_sender, list);
250 mss->list.next = NULL;
251 wake_up_process(mss->tsk);
255 static void expunge_all(struct msg_queue *msq, int res)
257 struct list_head *tmp;
259 tmp = msq->q_receivers.next;
260 while (tmp != &msq->q_receivers) {
261 struct msg_receiver *msr;
263 msr = list_entry(tmp, struct msg_receiver, r_list);
266 wake_up_process(msr->r_tsk);
268 msr->r_msg = ERR_PTR(res);
273 * freeque() wakes up waiters on the sender and receiver waiting queue,
274 * removes the message queue from message queue ID IDR, and cleans up all the
275 * messages associated with this queue.
277 * msg_ids.rw_mutex (writer) and the spinlock for this message queue are held
278 * before freeque() is called. msg_ids.rw_mutex remains locked on exit.
280 static void freeque(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp)
282 struct list_head *tmp;
283 struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm);
285 expunge_all(msq, -EIDRM);
286 ss_wakeup(&msq->q_senders, 1);
290 tmp = msq->q_messages.next;
291 while (tmp != &msq->q_messages) {
292 struct msg_msg *msg = list_entry(tmp, struct msg_msg, m_list);
295 atomic_dec(&ns->msg_hdrs);
298 atomic_sub(msq->q_cbytes, &ns->msg_bytes);
299 security_msg_queue_free(msq);
304 * Called with msg_ids.rw_mutex and ipcp locked.
306 static inline int msg_security(struct kern_ipc_perm *ipcp, int msgflg)
308 struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm);
310 return security_msg_queue_associate(msq, msgflg);
313 SYSCALL_DEFINE2(msgget, key_t, key, int, msgflg)
315 struct ipc_namespace *ns;
316 struct ipc_ops msg_ops;
317 struct ipc_params msg_params;
319 ns = current->nsproxy->ipc_ns;
321 msg_ops.getnew = newque;
322 msg_ops.associate = msg_security;
323 msg_ops.more_checks = NULL;
325 msg_params.key = key;
326 msg_params.flg = msgflg;
328 return ipcget(ns, &msg_ids(ns), &msg_ops, &msg_params);
331 static inline unsigned long
332 copy_msqid_to_user(void __user *buf, struct msqid64_ds *in, int version)
336 return copy_to_user(buf, in, sizeof(*in));
341 memset(&out, 0, sizeof(out));
343 ipc64_perm_to_ipc_perm(&in->msg_perm, &out.msg_perm);
345 out.msg_stime = in->msg_stime;
346 out.msg_rtime = in->msg_rtime;
347 out.msg_ctime = in->msg_ctime;
349 if (in->msg_cbytes > USHRT_MAX)
350 out.msg_cbytes = USHRT_MAX;
352 out.msg_cbytes = in->msg_cbytes;
353 out.msg_lcbytes = in->msg_cbytes;
355 if (in->msg_qnum > USHRT_MAX)
356 out.msg_qnum = USHRT_MAX;
358 out.msg_qnum = in->msg_qnum;
360 if (in->msg_qbytes > USHRT_MAX)
361 out.msg_qbytes = USHRT_MAX;
363 out.msg_qbytes = in->msg_qbytes;
364 out.msg_lqbytes = in->msg_qbytes;
366 out.msg_lspid = in->msg_lspid;
367 out.msg_lrpid = in->msg_lrpid;
369 return copy_to_user(buf, &out, sizeof(out));
376 static inline unsigned long
377 copy_msqid_from_user(struct msqid64_ds *out, void __user *buf, int version)
381 if (copy_from_user(out, buf, sizeof(*out)))
386 struct msqid_ds tbuf_old;
388 if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old)))
391 out->msg_perm.uid = tbuf_old.msg_perm.uid;
392 out->msg_perm.gid = tbuf_old.msg_perm.gid;
393 out->msg_perm.mode = tbuf_old.msg_perm.mode;
395 if (tbuf_old.msg_qbytes == 0)
396 out->msg_qbytes = tbuf_old.msg_lqbytes;
398 out->msg_qbytes = tbuf_old.msg_qbytes;
408 * This function handles some msgctl commands which require the rw_mutex
409 * to be held in write mode.
410 * NOTE: no locks must be held, the rw_mutex is taken inside this function.
412 static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd,
413 struct msqid_ds __user *buf, int version)
415 struct kern_ipc_perm *ipcp;
416 struct msqid64_ds uninitialized_var(msqid64);
417 struct msg_queue *msq;
420 if (cmd == IPC_SET) {
421 if (copy_msqid_from_user(&msqid64, buf, version))
425 ipcp = ipcctl_pre_down(ns, &msg_ids(ns), msqid, cmd,
426 &msqid64.msg_perm, msqid64.msg_qbytes);
428 return PTR_ERR(ipcp);
430 msq = container_of(ipcp, struct msg_queue, q_perm);
432 err = security_msg_queue_msgctl(msq, cmd);
441 if (msqid64.msg_qbytes > ns->msg_ctlmnb &&
442 !capable(CAP_SYS_RESOURCE)) {
447 err = ipc_update_perm(&msqid64.msg_perm, ipcp);
451 msq->q_qbytes = msqid64.msg_qbytes;
453 msq->q_ctime = get_seconds();
454 /* sleeping receivers might be excluded by
455 * stricter permissions.
457 expunge_all(msq, -EAGAIN);
458 /* sleeping senders might be able to send
459 * due to a larger queue size.
461 ss_wakeup(&msq->q_senders, 0);
469 up_write(&msg_ids(ns).rw_mutex);
473 SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, struct msqid_ds __user *, buf)
475 struct msg_queue *msq;
477 struct ipc_namespace *ns;
479 if (msqid < 0 || cmd < 0)
482 version = ipc_parse_version(&cmd);
483 ns = current->nsproxy->ipc_ns;
489 struct msginfo msginfo;
495 * We must not return kernel stack data.
496 * due to padding, it's not enough
497 * to set all member fields.
499 err = security_msg_queue_msgctl(NULL, cmd);
503 memset(&msginfo, 0, sizeof(msginfo));
504 msginfo.msgmni = ns->msg_ctlmni;
505 msginfo.msgmax = ns->msg_ctlmax;
506 msginfo.msgmnb = ns->msg_ctlmnb;
507 msginfo.msgssz = MSGSSZ;
508 msginfo.msgseg = MSGSEG;
509 down_read(&msg_ids(ns).rw_mutex);
510 if (cmd == MSG_INFO) {
511 msginfo.msgpool = msg_ids(ns).in_use;
512 msginfo.msgmap = atomic_read(&ns->msg_hdrs);
513 msginfo.msgtql = atomic_read(&ns->msg_bytes);
515 msginfo.msgmap = MSGMAP;
516 msginfo.msgpool = MSGPOOL;
517 msginfo.msgtql = MSGTQL;
519 max_id = ipc_get_maxid(&msg_ids(ns));
520 up_read(&msg_ids(ns).rw_mutex);
521 if (copy_to_user(buf, &msginfo, sizeof(struct msginfo)))
523 return (max_id < 0) ? 0 : max_id;
525 case MSG_STAT: /* msqid is an index rather than a msg queue id */
528 struct msqid64_ds tbuf;
534 if (cmd == MSG_STAT) {
535 msq = msg_lock(ns, msqid);
538 success_return = msq->q_perm.id;
540 msq = msg_lock_check(ns, msqid);
546 if (ipcperms(ns, &msq->q_perm, S_IRUGO))
549 err = security_msg_queue_msgctl(msq, cmd);
553 memset(&tbuf, 0, sizeof(tbuf));
555 kernel_to_ipc64_perm(&msq->q_perm, &tbuf.msg_perm);
556 tbuf.msg_stime = msq->q_stime;
557 tbuf.msg_rtime = msq->q_rtime;
558 tbuf.msg_ctime = msq->q_ctime;
559 tbuf.msg_cbytes = msq->q_cbytes;
560 tbuf.msg_qnum = msq->q_qnum;
561 tbuf.msg_qbytes = msq->q_qbytes;
562 tbuf.msg_lspid = msq->q_lspid;
563 tbuf.msg_lrpid = msq->q_lrpid;
565 if (copy_msqid_to_user(buf, &tbuf, version))
567 return success_return;
571 err = msgctl_down(ns, msqid, cmd, buf, version);
582 static int testmsg(struct msg_msg *msg, long type, int mode)
589 case SEARCH_LESSEQUAL:
590 if (msg->m_type <=type)
594 if (msg->m_type == type)
597 case SEARCH_NOTEQUAL:
598 if (msg->m_type != type)
605 static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg)
607 struct list_head *tmp;
609 tmp = msq->q_receivers.next;
610 while (tmp != &msq->q_receivers) {
611 struct msg_receiver *msr;
613 msr = list_entry(tmp, struct msg_receiver, r_list);
615 if (testmsg(msg, msr->r_msgtype, msr->r_mode) &&
616 !security_msg_queue_msgrcv(msq, msg, msr->r_tsk,
617 msr->r_msgtype, msr->r_mode)) {
619 list_del(&msr->r_list);
620 if (msr->r_maxsize < msg->m_ts) {
622 wake_up_process(msr->r_tsk);
624 msr->r_msg = ERR_PTR(-E2BIG);
627 msq->q_lrpid = task_pid_vnr(msr->r_tsk);
628 msq->q_rtime = get_seconds();
629 wake_up_process(msr->r_tsk);
640 long do_msgsnd(int msqid, long mtype, void __user *mtext,
641 size_t msgsz, int msgflg)
643 struct msg_queue *msq;
646 struct ipc_namespace *ns;
648 ns = current->nsproxy->ipc_ns;
650 if (msgsz > ns->msg_ctlmax || (long) msgsz < 0 || msqid < 0)
655 msg = load_msg(mtext, msgsz);
662 msq = msg_lock_check(ns, msqid);
672 if (ipcperms(ns, &msq->q_perm, S_IWUGO))
673 goto out_unlock_free;
675 err = security_msg_queue_msgsnd(msq, msg, msgflg);
677 goto out_unlock_free;
679 if (msgsz + msq->q_cbytes <= msq->q_qbytes &&
680 1 + msq->q_qnum <= msq->q_qbytes) {
684 /* queue full, wait: */
685 if (msgflg & IPC_NOWAIT) {
687 goto out_unlock_free;
694 ipc_lock_by_ptr(&msq->q_perm);
696 if (msq->q_perm.deleted) {
698 goto out_unlock_free;
702 if (signal_pending(current)) {
703 err = -ERESTARTNOHAND;
704 goto out_unlock_free;
708 msq->q_lspid = task_tgid_vnr(current);
709 msq->q_stime = get_seconds();
711 if (!pipelined_send(msq, msg)) {
712 /* no one is waiting for this message, enqueue it */
713 list_add_tail(&msg->m_list, &msq->q_messages);
714 msq->q_cbytes += msgsz;
716 atomic_add(msgsz, &ns->msg_bytes);
717 atomic_inc(&ns->msg_hdrs);
731 SYSCALL_DEFINE4(msgsnd, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz,
736 if (get_user(mtype, &msgp->mtype))
738 return do_msgsnd(msqid, mtype, msgp->mtext, msgsz, msgflg);
741 static inline int convert_mode(long *msgtyp, int msgflg)
743 if (msgflg & MSG_COPY)
744 return SEARCH_NUMBER;
746 * find message of correct type.
747 * msgtyp = 0 => get first.
748 * msgtyp > 0 => get first message of matching type.
749 * msgtyp < 0 => get message with least type must be < abs(msgtype).
755 return SEARCH_LESSEQUAL;
757 if (msgflg & MSG_EXCEPT)
758 return SEARCH_NOTEQUAL;
762 static long do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz)
764 struct msgbuf __user *msgp = dest;
767 if (put_user(msg->m_type, &msgp->mtype))
770 msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz;
771 if (store_msg(msgp->mtext, msg, msgsz))
776 #ifdef CONFIG_CHECKPOINT_RESTORE
778 * This function creates new kernel message structure, large enough to store
779 * bufsz message bytes.
781 static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz)
783 struct msg_msg *copy;
786 * Create dummy message to copy real message to.
788 copy = load_msg(buf, bufsz);
794 static inline void free_copy(struct msg_msg *copy)
800 static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz)
802 return ERR_PTR(-ENOSYS);
805 static inline void free_copy(struct msg_msg *copy)
810 static struct msg_msg *find_msg(struct msg_queue *msq, long *msgtyp, int mode)
815 list_for_each_entry(msg, &msq->q_messages, m_list) {
816 if (testmsg(msg, *msgtyp, mode) &&
817 !security_msg_queue_msgrcv(msq, msg, current,
819 if (mode == SEARCH_LESSEQUAL && msg->m_type != 1) {
820 *msgtyp = msg->m_type - 1;
821 } else if (mode == SEARCH_NUMBER) {
822 if (*msgtyp == count)
830 return ERR_PTR(-EAGAIN);
834 long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp,
836 long (*msg_handler)(void __user *, struct msg_msg *, size_t))
838 struct msg_queue *msq;
841 struct ipc_namespace *ns;
842 struct msg_msg *copy = NULL;
844 ns = current->nsproxy->ipc_ns;
846 if (msqid < 0 || (long) bufsz < 0)
848 if (msgflg & MSG_COPY) {
849 copy = prepare_copy(buf, min_t(size_t, bufsz, ns->msg_ctlmax));
851 return PTR_ERR(copy);
853 mode = convert_mode(&msgtyp, msgflg);
855 msq = msg_lock_check(ns, msqid);
862 struct msg_receiver msr_d;
864 msg = ERR_PTR(-EACCES);
865 if (ipcperms(ns, &msq->q_perm, S_IRUGO))
868 msg = find_msg(msq, &msgtyp, mode);
872 * Found a suitable message.
873 * Unlink it from the queue.
875 if ((bufsz < msg->m_ts) && !(msgflg & MSG_NOERROR)) {
876 msg = ERR_PTR(-E2BIG);
880 * If we are copying, then do not unlink message and do
881 * not update queue parameters.
883 if (msgflg & MSG_COPY) {
884 msg = copy_msg(msg, copy);
887 list_del(&msg->m_list);
889 msq->q_rtime = get_seconds();
890 msq->q_lrpid = task_tgid_vnr(current);
891 msq->q_cbytes -= msg->m_ts;
892 atomic_sub(msg->m_ts, &ns->msg_bytes);
893 atomic_dec(&ns->msg_hdrs);
894 ss_wakeup(&msq->q_senders, 0);
898 /* No message waiting. Wait for a message */
899 if (msgflg & IPC_NOWAIT) {
900 msg = ERR_PTR(-ENOMSG);
903 list_add_tail(&msr_d.r_list, &msq->q_receivers);
904 msr_d.r_tsk = current;
905 msr_d.r_msgtype = msgtyp;
907 if (msgflg & MSG_NOERROR)
908 msr_d.r_maxsize = INT_MAX;
910 msr_d.r_maxsize = bufsz;
911 msr_d.r_msg = ERR_PTR(-EAGAIN);
912 current->state = TASK_INTERRUPTIBLE;
917 /* Lockless receive, part 1:
918 * Disable preemption. We don't hold a reference to the queue
919 * and getting a reference would defeat the idea of a lockless
920 * operation, thus the code relies on rcu to guarantee the
922 * Prior to destruction, expunge_all(-EIRDM) changes r_msg.
923 * Thus if r_msg is -EAGAIN, then the queue not yet destroyed.
924 * rcu_read_lock() prevents preemption between reading r_msg
925 * and the spin_lock() inside ipc_lock_by_ptr().
929 /* Lockless receive, part 2:
930 * Wait until pipelined_send or expunge_all are outside of
931 * wake_up_process(). There is a race with exit(), see
932 * ipc/mqueue.c for the details.
934 msg = (struct msg_msg*)msr_d.r_msg;
935 while (msg == NULL) {
937 msg = (struct msg_msg *)msr_d.r_msg;
940 /* Lockless receive, part 3:
941 * If there is a message or an error then accept it without
944 if (msg != ERR_PTR(-EAGAIN)) {
949 /* Lockless receive, part 3:
950 * Acquire the queue spinlock.
952 ipc_lock_by_ptr(&msq->q_perm);
955 /* Lockless receive, part 4:
956 * Repeat test after acquiring the spinlock.
958 msg = (struct msg_msg*)msr_d.r_msg;
959 if (msg != ERR_PTR(-EAGAIN))
962 list_del(&msr_d.r_list);
963 if (signal_pending(current)) {
964 msg = ERR_PTR(-ERESTARTNOHAND);
975 bufsz = msg_handler(buf, msg, bufsz);
981 SYSCALL_DEFINE5(msgrcv, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz,
982 long, msgtyp, int, msgflg)
984 return do_msgrcv(msqid, msgp, msgsz, msgtyp, msgflg, do_msg_fill);
987 #ifdef CONFIG_PROC_FS
988 static int sysvipc_msg_proc_show(struct seq_file *s, void *it)
990 struct user_namespace *user_ns = seq_user_ns(s);
991 struct msg_queue *msq = it;
994 "%10d %10d %4o %10lu %10lu %5u %5u %5u %5u %5u %5u %10lu %10lu %10lu\n",
1002 from_kuid_munged(user_ns, msq->q_perm.uid),
1003 from_kgid_munged(user_ns, msq->q_perm.gid),
1004 from_kuid_munged(user_ns, msq->q_perm.cuid),
1005 from_kgid_munged(user_ns, msq->q_perm.cgid),