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);
202 /* ipc_addid() locks msq upon success. */
203 id = ipc_addid(&msg_ids(ns), &msq->q_perm, ns->msg_ctlmni);
205 security_msg_queue_free(msq);
210 msq->q_stime = msq->q_rtime = 0;
211 msq->q_ctime = get_seconds();
212 msq->q_cbytes = msq->q_qnum = 0;
213 msq->q_qbytes = ns->msg_ctlmnb;
214 msq->q_lspid = msq->q_lrpid = 0;
215 INIT_LIST_HEAD(&msq->q_messages);
216 INIT_LIST_HEAD(&msq->q_receivers);
217 INIT_LIST_HEAD(&msq->q_senders);
219 ipc_unlock_object(&msq->q_perm);
222 return msq->q_perm.id;
225 static inline void ss_add(struct msg_queue *msq, struct msg_sender *mss)
228 current->state = TASK_INTERRUPTIBLE;
229 list_add_tail(&mss->list, &msq->q_senders);
232 static inline void ss_del(struct msg_sender *mss)
234 if (mss->list.next != NULL)
235 list_del(&mss->list);
238 static void ss_wakeup(struct list_head *h, int kill)
240 struct msg_sender *mss, *t;
242 list_for_each_entry_safe(mss, t, h, list) {
244 mss->list.next = NULL;
245 wake_up_process(mss->tsk);
249 static void expunge_all(struct msg_queue *msq, int res)
251 struct msg_receiver *msr, *t;
253 list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) {
255 wake_up_process(msr->r_tsk);
257 msr->r_msg = ERR_PTR(res);
262 * freeque() wakes up waiters on the sender and receiver waiting queue,
263 * removes the message queue from message queue ID IDR, and cleans up all the
264 * messages associated with this queue.
266 * msg_ids.rw_mutex (writer) and the spinlock for this message queue are held
267 * before freeque() is called. msg_ids.rw_mutex remains locked on exit.
269 static void freeque(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp)
271 struct msg_msg *msg, *t;
272 struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm);
274 expunge_all(msq, -EIDRM);
275 ss_wakeup(&msq->q_senders, 1);
279 list_for_each_entry_safe(msg, t, &msq->q_messages, m_list) {
280 atomic_dec(&ns->msg_hdrs);
283 atomic_sub(msq->q_cbytes, &ns->msg_bytes);
284 security_msg_queue_free(msq);
289 * Called with msg_ids.rw_mutex and ipcp locked.
291 static inline int msg_security(struct kern_ipc_perm *ipcp, int msgflg)
293 struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm);
295 return security_msg_queue_associate(msq, msgflg);
298 SYSCALL_DEFINE2(msgget, key_t, key, int, msgflg)
300 struct ipc_namespace *ns;
301 struct ipc_ops msg_ops;
302 struct ipc_params msg_params;
304 ns = current->nsproxy->ipc_ns;
306 msg_ops.getnew = newque;
307 msg_ops.associate = msg_security;
308 msg_ops.more_checks = NULL;
310 msg_params.key = key;
311 msg_params.flg = msgflg;
313 return ipcget(ns, &msg_ids(ns), &msg_ops, &msg_params);
316 static inline unsigned long
317 copy_msqid_to_user(void __user *buf, struct msqid64_ds *in, int version)
321 return copy_to_user(buf, in, sizeof(*in));
326 memset(&out, 0, sizeof(out));
328 ipc64_perm_to_ipc_perm(&in->msg_perm, &out.msg_perm);
330 out.msg_stime = in->msg_stime;
331 out.msg_rtime = in->msg_rtime;
332 out.msg_ctime = in->msg_ctime;
334 if (in->msg_cbytes > USHRT_MAX)
335 out.msg_cbytes = USHRT_MAX;
337 out.msg_cbytes = in->msg_cbytes;
338 out.msg_lcbytes = in->msg_cbytes;
340 if (in->msg_qnum > USHRT_MAX)
341 out.msg_qnum = USHRT_MAX;
343 out.msg_qnum = in->msg_qnum;
345 if (in->msg_qbytes > USHRT_MAX)
346 out.msg_qbytes = USHRT_MAX;
348 out.msg_qbytes = in->msg_qbytes;
349 out.msg_lqbytes = in->msg_qbytes;
351 out.msg_lspid = in->msg_lspid;
352 out.msg_lrpid = in->msg_lrpid;
354 return copy_to_user(buf, &out, sizeof(out));
361 static inline unsigned long
362 copy_msqid_from_user(struct msqid64_ds *out, void __user *buf, int version)
366 if (copy_from_user(out, buf, sizeof(*out)))
371 struct msqid_ds tbuf_old;
373 if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old)))
376 out->msg_perm.uid = tbuf_old.msg_perm.uid;
377 out->msg_perm.gid = tbuf_old.msg_perm.gid;
378 out->msg_perm.mode = tbuf_old.msg_perm.mode;
380 if (tbuf_old.msg_qbytes == 0)
381 out->msg_qbytes = tbuf_old.msg_lqbytes;
383 out->msg_qbytes = tbuf_old.msg_qbytes;
393 * This function handles some msgctl commands which require the rw_mutex
394 * to be held in write mode.
395 * NOTE: no locks must be held, the rw_mutex is taken inside this function.
397 static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd,
398 struct msqid_ds __user *buf, int version)
400 struct kern_ipc_perm *ipcp;
401 struct msqid64_ds uninitialized_var(msqid64);
402 struct msg_queue *msq;
405 if (cmd == IPC_SET) {
406 if (copy_msqid_from_user(&msqid64, buf, version))
410 down_write(&msg_ids(ns).rw_mutex);
413 ipcp = ipcctl_pre_down(ns, &msg_ids(ns), msqid, cmd,
414 &msqid64.msg_perm, msqid64.msg_qbytes);
417 /* the ipc lock is not held upon failure */
421 msq = container_of(ipcp, struct msg_queue, q_perm);
423 err = security_msg_queue_msgctl(msq, cmd);
429 /* freeque unlocks the ipc object and rcu */
433 if (msqid64.msg_qbytes > ns->msg_ctlmnb &&
434 !capable(CAP_SYS_RESOURCE)) {
439 err = ipc_update_perm(&msqid64.msg_perm, ipcp);
443 msq->q_qbytes = msqid64.msg_qbytes;
445 msq->q_ctime = get_seconds();
446 /* sleeping receivers might be excluded by
447 * stricter permissions.
449 expunge_all(msq, -EAGAIN);
450 /* sleeping senders might be able to send
451 * due to a larger queue size.
453 ss_wakeup(&msq->q_senders, 0);
460 ipc_unlock_object(&msq->q_perm);
464 up_write(&msg_ids(ns).rw_mutex);
468 SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, struct msqid_ds __user *, buf)
470 struct msg_queue *msq;
472 struct ipc_namespace *ns;
474 if (msqid < 0 || cmd < 0)
477 version = ipc_parse_version(&cmd);
478 ns = current->nsproxy->ipc_ns;
484 struct msginfo msginfo;
490 * We must not return kernel stack data.
491 * due to padding, it's not enough
492 * to set all member fields.
494 err = security_msg_queue_msgctl(NULL, cmd);
498 memset(&msginfo, 0, sizeof(msginfo));
499 msginfo.msgmni = ns->msg_ctlmni;
500 msginfo.msgmax = ns->msg_ctlmax;
501 msginfo.msgmnb = ns->msg_ctlmnb;
502 msginfo.msgssz = MSGSSZ;
503 msginfo.msgseg = MSGSEG;
504 down_read(&msg_ids(ns).rw_mutex);
505 if (cmd == MSG_INFO) {
506 msginfo.msgpool = msg_ids(ns).in_use;
507 msginfo.msgmap = atomic_read(&ns->msg_hdrs);
508 msginfo.msgtql = atomic_read(&ns->msg_bytes);
510 msginfo.msgmap = MSGMAP;
511 msginfo.msgpool = MSGPOOL;
512 msginfo.msgtql = MSGTQL;
514 max_id = ipc_get_maxid(&msg_ids(ns));
515 up_read(&msg_ids(ns).rw_mutex);
516 if (copy_to_user(buf, &msginfo, sizeof(struct msginfo)))
518 return (max_id < 0) ? 0 : max_id;
520 case MSG_STAT: /* msqid is an index rather than a msg queue id */
523 struct msqid64_ds tbuf;
529 if (cmd == MSG_STAT) {
530 msq = msg_lock(ns, msqid);
533 success_return = msq->q_perm.id;
535 msq = msg_lock_check(ns, msqid);
541 if (ipcperms(ns, &msq->q_perm, S_IRUGO))
544 err = security_msg_queue_msgctl(msq, cmd);
548 memset(&tbuf, 0, sizeof(tbuf));
550 kernel_to_ipc64_perm(&msq->q_perm, &tbuf.msg_perm);
551 tbuf.msg_stime = msq->q_stime;
552 tbuf.msg_rtime = msq->q_rtime;
553 tbuf.msg_ctime = msq->q_ctime;
554 tbuf.msg_cbytes = msq->q_cbytes;
555 tbuf.msg_qnum = msq->q_qnum;
556 tbuf.msg_qbytes = msq->q_qbytes;
557 tbuf.msg_lspid = msq->q_lspid;
558 tbuf.msg_lrpid = msq->q_lrpid;
560 if (copy_msqid_to_user(buf, &tbuf, version))
562 return success_return;
566 err = msgctl_down(ns, msqid, cmd, buf, version);
577 static int testmsg(struct msg_msg *msg, long type, int mode)
584 case SEARCH_LESSEQUAL:
585 if (msg->m_type <=type)
589 if (msg->m_type == type)
592 case SEARCH_NOTEQUAL:
593 if (msg->m_type != type)
600 static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg)
602 struct msg_receiver *msr, *t;
604 list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) {
605 if (testmsg(msg, msr->r_msgtype, msr->r_mode) &&
606 !security_msg_queue_msgrcv(msq, msg, msr->r_tsk,
607 msr->r_msgtype, msr->r_mode)) {
609 list_del(&msr->r_list);
610 if (msr->r_maxsize < msg->m_ts) {
612 wake_up_process(msr->r_tsk);
614 msr->r_msg = ERR_PTR(-E2BIG);
617 msq->q_lrpid = task_pid_vnr(msr->r_tsk);
618 msq->q_rtime = get_seconds();
619 wake_up_process(msr->r_tsk);
630 long do_msgsnd(int msqid, long mtype, void __user *mtext,
631 size_t msgsz, int msgflg)
633 struct msg_queue *msq;
636 struct ipc_namespace *ns;
638 ns = current->nsproxy->ipc_ns;
640 if (msgsz > ns->msg_ctlmax || (long) msgsz < 0 || msqid < 0)
645 msg = load_msg(mtext, msgsz);
652 msq = msg_lock_check(ns, msqid);
662 if (ipcperms(ns, &msq->q_perm, S_IWUGO))
663 goto out_unlock_free;
665 err = security_msg_queue_msgsnd(msq, msg, msgflg);
667 goto out_unlock_free;
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) {
677 goto out_unlock_free;
681 if (!ipc_rcu_getref(msq)) {
683 goto out_unlock_free;
689 ipc_lock_by_ptr(&msq->q_perm);
691 if (msq->q_perm.deleted) {
693 goto out_unlock_free;
697 if (signal_pending(current)) {
698 err = -ERESTARTNOHAND;
699 goto out_unlock_free;
703 msq->q_lspid = task_tgid_vnr(current);
704 msq->q_stime = get_seconds();
706 if (!pipelined_send(msq, msg)) {
707 /* no one is waiting for this message, enqueue it */
708 list_add_tail(&msg->m_list, &msq->q_messages);
709 msq->q_cbytes += msgsz;
711 atomic_add(msgsz, &ns->msg_bytes);
712 atomic_inc(&ns->msg_hdrs);
726 SYSCALL_DEFINE4(msgsnd, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz,
731 if (get_user(mtype, &msgp->mtype))
733 return do_msgsnd(msqid, mtype, msgp->mtext, msgsz, msgflg);
736 static inline int convert_mode(long *msgtyp, int msgflg)
738 if (msgflg & MSG_COPY)
739 return SEARCH_NUMBER;
741 * find message of correct type.
742 * msgtyp = 0 => get first.
743 * msgtyp > 0 => get first message of matching type.
744 * msgtyp < 0 => get message with least type must be < abs(msgtype).
750 return SEARCH_LESSEQUAL;
752 if (msgflg & MSG_EXCEPT)
753 return SEARCH_NOTEQUAL;
757 static long do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz)
759 struct msgbuf __user *msgp = dest;
762 if (put_user(msg->m_type, &msgp->mtype))
765 msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz;
766 if (store_msg(msgp->mtext, msg, msgsz))
771 #ifdef CONFIG_CHECKPOINT_RESTORE
773 * This function creates new kernel message structure, large enough to store
774 * bufsz message bytes.
776 static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz)
778 struct msg_msg *copy;
781 * Create dummy message to copy real message to.
783 copy = load_msg(buf, bufsz);
789 static inline void free_copy(struct msg_msg *copy)
795 static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz)
797 return ERR_PTR(-ENOSYS);
800 static inline void free_copy(struct msg_msg *copy)
805 static struct msg_msg *find_msg(struct msg_queue *msq, long *msgtyp, int mode)
810 list_for_each_entry(msg, &msq->q_messages, m_list) {
811 if (testmsg(msg, *msgtyp, mode) &&
812 !security_msg_queue_msgrcv(msq, msg, current,
814 if (mode == SEARCH_LESSEQUAL && msg->m_type != 1) {
815 *msgtyp = msg->m_type - 1;
816 } else if (mode == SEARCH_NUMBER) {
817 if (*msgtyp == count)
825 return ERR_PTR(-EAGAIN);
829 long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp,
831 long (*msg_handler)(void __user *, struct msg_msg *, size_t))
833 struct msg_queue *msq;
836 struct ipc_namespace *ns;
837 struct msg_msg *copy = NULL;
839 ns = current->nsproxy->ipc_ns;
841 if (msqid < 0 || (long) bufsz < 0)
843 if (msgflg & MSG_COPY) {
844 copy = prepare_copy(buf, min_t(size_t, bufsz, ns->msg_ctlmax));
846 return PTR_ERR(copy);
848 mode = convert_mode(&msgtyp, msgflg);
850 msq = msg_lock_check(ns, msqid);
857 struct msg_receiver msr_d;
859 msg = ERR_PTR(-EACCES);
860 if (ipcperms(ns, &msq->q_perm, S_IRUGO))
863 msg = find_msg(msq, &msgtyp, mode);
867 * Found a suitable message.
868 * Unlink it from the queue.
870 if ((bufsz < msg->m_ts) && !(msgflg & MSG_NOERROR)) {
871 msg = ERR_PTR(-E2BIG);
875 * If we are copying, then do not unlink message and do
876 * not update queue parameters.
878 if (msgflg & MSG_COPY) {
879 msg = copy_msg(msg, copy);
882 list_del(&msg->m_list);
884 msq->q_rtime = get_seconds();
885 msq->q_lrpid = task_tgid_vnr(current);
886 msq->q_cbytes -= msg->m_ts;
887 atomic_sub(msg->m_ts, &ns->msg_bytes);
888 atomic_dec(&ns->msg_hdrs);
889 ss_wakeup(&msq->q_senders, 0);
893 /* No message waiting. Wait for a message */
894 if (msgflg & IPC_NOWAIT) {
895 msg = ERR_PTR(-ENOMSG);
898 list_add_tail(&msr_d.r_list, &msq->q_receivers);
899 msr_d.r_tsk = current;
900 msr_d.r_msgtype = msgtyp;
902 if (msgflg & MSG_NOERROR)
903 msr_d.r_maxsize = INT_MAX;
905 msr_d.r_maxsize = bufsz;
906 msr_d.r_msg = ERR_PTR(-EAGAIN);
907 current->state = TASK_INTERRUPTIBLE;
912 /* Lockless receive, part 1:
913 * Disable preemption. We don't hold a reference to the queue
914 * and getting a reference would defeat the idea of a lockless
915 * operation, thus the code relies on rcu to guarantee the
917 * Prior to destruction, expunge_all(-EIRDM) changes r_msg.
918 * Thus if r_msg is -EAGAIN, then the queue not yet destroyed.
919 * rcu_read_lock() prevents preemption between reading r_msg
920 * and the spin_lock() inside ipc_lock_by_ptr().
924 /* Lockless receive, part 2:
925 * Wait until pipelined_send or expunge_all are outside of
926 * wake_up_process(). There is a race with exit(), see
927 * ipc/mqueue.c for the details.
929 msg = (struct msg_msg*)msr_d.r_msg;
930 while (msg == NULL) {
932 msg = (struct msg_msg *)msr_d.r_msg;
935 /* Lockless receive, part 3:
936 * If there is a message or an error then accept it without
939 if (msg != ERR_PTR(-EAGAIN)) {
944 /* Lockless receive, part 3:
945 * Acquire the queue spinlock.
947 ipc_lock_by_ptr(&msq->q_perm);
950 /* Lockless receive, part 4:
951 * Repeat test after acquiring the spinlock.
953 msg = (struct msg_msg*)msr_d.r_msg;
954 if (msg != ERR_PTR(-EAGAIN))
957 list_del(&msr_d.r_list);
958 if (signal_pending(current)) {
959 msg = ERR_PTR(-ERESTARTNOHAND);
970 bufsz = msg_handler(buf, msg, bufsz);
976 SYSCALL_DEFINE5(msgrcv, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz,
977 long, msgtyp, int, msgflg)
979 return do_msgrcv(msqid, msgp, msgsz, msgtyp, msgflg, do_msg_fill);
982 #ifdef CONFIG_PROC_FS
983 static int sysvipc_msg_proc_show(struct seq_file *s, void *it)
985 struct user_namespace *user_ns = seq_user_ns(s);
986 struct msg_queue *msq = it;
989 "%10d %10d %4o %10lu %10lu %5u %5u %5u %5u %5u %5u %10lu %10lu %10lu\n",
997 from_kuid_munged(user_ns, msq->q_perm.uid),
998 from_kgid_munged(user_ns, msq->q_perm.gid),
999 from_kuid_munged(user_ns, msq->q_perm.cuid),
1000 from_kgid_munged(user_ns, msq->q_perm.cgid),