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Linux/ipc/msg.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * linux/ipc/msg.c
  4  * Copyright (C) 1992 Krishna Balasubramanian
  5  *
  6  * Removed all the remaining kerneld mess
  7  * Catch the -EFAULT stuff properly
  8  * Use GFP_KERNEL for messages as in 1.2
  9  * Fixed up the unchecked user space derefs
 10  * Copyright (C) 1998 Alan Cox & Andi Kleen
 11  *
 12  * /proc/sysvipc/msg support (c) 1999 Dragos Acostachioaie <dragos@iname.com>
 13  *
 14  * mostly rewritten, threaded and wake-one semantics added
 15  * MSGMAX limit removed, sysctl's added
 16  * (c) 1999 Manfred Spraul <manfred@colorfullife.com>
 17  *
 18  * support for audit of ipc object properties and permission changes
 19  * Dustin Kirkland <dustin.kirkland@us.ibm.com>
 20  *
 21  * namespaces support
 22  * OpenVZ, SWsoft Inc.
 23  * Pavel Emelianov <xemul@openvz.org>
 24  */
 25 
 26 #include <linux/capability.h>
 27 #include <linux/msg.h>
 28 #include <linux/spinlock.h>
 29 #include <linux/init.h>
 30 #include <linux/mm.h>
 31 #include <linux/proc_fs.h>
 32 #include <linux/list.h>
 33 #include <linux/security.h>
 34 #include <linux/sched/wake_q.h>
 35 #include <linux/syscalls.h>
 36 #include <linux/audit.h>
 37 #include <linux/seq_file.h>
 38 #include <linux/rwsem.h>
 39 #include <linux/nsproxy.h>
 40 #include <linux/ipc_namespace.h>
 41 
 42 #include <asm/current.h>
 43 #include <linux/uaccess.h>
 44 #include "util.h"
 45 
 46 /* one msq_queue structure for each present queue on the system */
 47 struct msg_queue {
 48         struct kern_ipc_perm q_perm;
 49         time64_t q_stime;               /* last msgsnd time */
 50         time64_t q_rtime;               /* last msgrcv time */
 51         time64_t q_ctime;               /* last change time */
 52         unsigned long q_cbytes;         /* current number of bytes on queue */
 53         unsigned long q_qnum;           /* number of messages in queue */
 54         unsigned long q_qbytes;         /* max number of bytes on queue */
 55         struct pid *q_lspid;            /* pid of last msgsnd */
 56         struct pid *q_lrpid;            /* last receive pid */
 57 
 58         struct list_head q_messages;
 59         struct list_head q_receivers;
 60         struct list_head q_senders;
 61 } __randomize_layout;
 62 
 63 /* one msg_receiver structure for each sleeping receiver */
 64 struct msg_receiver {
 65         struct list_head        r_list;
 66         struct task_struct      *r_tsk;
 67 
 68         int                     r_mode;
 69         long                    r_msgtype;
 70         long                    r_maxsize;
 71 
 72         struct msg_msg          *r_msg;
 73 };
 74 
 75 /* one msg_sender for each sleeping sender */
 76 struct msg_sender {
 77         struct list_head        list;
 78         struct task_struct      *tsk;
 79         size_t                  msgsz;
 80 };
 81 
 82 #define SEARCH_ANY              1
 83 #define SEARCH_EQUAL            2
 84 #define SEARCH_NOTEQUAL         3
 85 #define SEARCH_LESSEQUAL        4
 86 #define SEARCH_NUMBER           5
 87 
 88 #define msg_ids(ns)     ((ns)->ids[IPC_MSG_IDS])
 89 
 90 static inline struct msg_queue *msq_obtain_object(struct ipc_namespace *ns, int id)
 91 {
 92         struct kern_ipc_perm *ipcp = ipc_obtain_object_idr(&msg_ids(ns), id);
 93 
 94         if (IS_ERR(ipcp))
 95                 return ERR_CAST(ipcp);
 96 
 97         return container_of(ipcp, struct msg_queue, q_perm);
 98 }
 99 
100 static inline struct msg_queue *msq_obtain_object_check(struct ipc_namespace *ns,
101                                                         int id)
102 {
103         struct kern_ipc_perm *ipcp = ipc_obtain_object_check(&msg_ids(ns), id);
104 
105         if (IS_ERR(ipcp))
106                 return ERR_CAST(ipcp);
107 
108         return container_of(ipcp, struct msg_queue, q_perm);
109 }
110 
111 static inline void msg_rmid(struct ipc_namespace *ns, struct msg_queue *s)
112 {
113         ipc_rmid(&msg_ids(ns), &s->q_perm);
114 }
115 
116 static void msg_rcu_free(struct rcu_head *head)
117 {
118         struct kern_ipc_perm *p = container_of(head, struct kern_ipc_perm, rcu);
119         struct msg_queue *msq = container_of(p, struct msg_queue, q_perm);
120 
121         security_msg_queue_free(&msq->q_perm);
122         kvfree(msq);
123 }
124 
125 /**
126  * newque - Create a new msg queue
127  * @ns: namespace
128  * @params: ptr to the structure that contains the key and msgflg
129  *
130  * Called with msg_ids.rwsem held (writer)
131  */
132 static int newque(struct ipc_namespace *ns, struct ipc_params *params)
133 {
134         struct msg_queue *msq;
135         int retval;
136         key_t key = params->key;
137         int msgflg = params->flg;
138 
139         msq = kvmalloc(sizeof(*msq), GFP_KERNEL);
140         if (unlikely(!msq))
141                 return -ENOMEM;
142 
143         msq->q_perm.mode = msgflg & S_IRWXUGO;
144         msq->q_perm.key = key;
145 
146         msq->q_perm.security = NULL;
147         retval = security_msg_queue_alloc(&msq->q_perm);
148         if (retval) {
149                 kvfree(msq);
150                 return retval;
151         }
152 
153         msq->q_stime = msq->q_rtime = 0;
154         msq->q_ctime = ktime_get_real_seconds();
155         msq->q_cbytes = msq->q_qnum = 0;
156         msq->q_qbytes = ns->msg_ctlmnb;
157         msq->q_lspid = msq->q_lrpid = NULL;
158         INIT_LIST_HEAD(&msq->q_messages);
159         INIT_LIST_HEAD(&msq->q_receivers);
160         INIT_LIST_HEAD(&msq->q_senders);
161 
162         /* ipc_addid() locks msq upon success. */
163         retval = ipc_addid(&msg_ids(ns), &msq->q_perm, ns->msg_ctlmni);
164         if (retval < 0) {
165                 call_rcu(&msq->q_perm.rcu, msg_rcu_free);
166                 return retval;
167         }
168 
169         ipc_unlock_object(&msq->q_perm);
170         rcu_read_unlock();
171 
172         return msq->q_perm.id;
173 }
174 
175 static inline bool msg_fits_inqueue(struct msg_queue *msq, size_t msgsz)
176 {
177         return msgsz + msq->q_cbytes <= msq->q_qbytes &&
178                 1 + msq->q_qnum <= msq->q_qbytes;
179 }
180 
181 static inline void ss_add(struct msg_queue *msq,
182                           struct msg_sender *mss, size_t msgsz)
183 {
184         mss->tsk = current;
185         mss->msgsz = msgsz;
186         __set_current_state(TASK_INTERRUPTIBLE);
187         list_add_tail(&mss->list, &msq->q_senders);
188 }
189 
190 static inline void ss_del(struct msg_sender *mss)
191 {
192         if (mss->list.next)
193                 list_del(&mss->list);
194 }
195 
196 static void ss_wakeup(struct msg_queue *msq,
197                       struct wake_q_head *wake_q, bool kill)
198 {
199         struct msg_sender *mss, *t;
200         struct task_struct *stop_tsk = NULL;
201         struct list_head *h = &msq->q_senders;
202 
203         list_for_each_entry_safe(mss, t, h, list) {
204                 if (kill)
205                         mss->list.next = NULL;
206 
207                 /*
208                  * Stop at the first task we don't wakeup,
209                  * we've already iterated the original
210                  * sender queue.
211                  */
212                 else if (stop_tsk == mss->tsk)
213                         break;
214                 /*
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
219                  * blocked task.
220                  */
221                 else if (!msg_fits_inqueue(msq, mss->msgsz)) {
222                         if (!stop_tsk)
223                                 stop_tsk = mss->tsk;
224 
225                         list_move_tail(&mss->list, &msq->q_senders);
226                         continue;
227                 }
228 
229                 wake_q_add(wake_q, mss->tsk);
230         }
231 }
232 
233 static void expunge_all(struct msg_queue *msq, int res,
234                         struct wake_q_head *wake_q)
235 {
236         struct msg_receiver *msr, *t;
237 
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));
241         }
242 }
243 
244 /*
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.
248  *
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.
251  */
252 static void freeque(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp)
253 {
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);
257 
258         expunge_all(msq, -EIDRM, &wake_q);
259         ss_wakeup(msq, &wake_q, true);
260         msg_rmid(ns, msq);
261         ipc_unlock_object(&msq->q_perm);
262         wake_up_q(&wake_q);
263         rcu_read_unlock();
264 
265         list_for_each_entry_safe(msg, t, &msq->q_messages, m_list) {
266                 atomic_dec(&ns->msg_hdrs);
267                 free_msg(msg);
268         }
269         atomic_sub(msq->q_cbytes, &ns->msg_bytes);
270         ipc_update_pid(&msq->q_lspid, NULL);
271         ipc_update_pid(&msq->q_lrpid, NULL);
272         ipc_rcu_putref(&msq->q_perm, msg_rcu_free);
273 }
274 
275 long ksys_msgget(key_t key, int msgflg)
276 {
277         struct ipc_namespace *ns;
278         static const struct ipc_ops msg_ops = {
279                 .getnew = newque,
280                 .associate = security_msg_queue_associate,
281         };
282         struct ipc_params msg_params;
283 
284         ns = current->nsproxy->ipc_ns;
285 
286         msg_params.key = key;
287         msg_params.flg = msgflg;
288 
289         return ipcget(ns, &msg_ids(ns), &msg_ops, &msg_params);
290 }
291 
292 SYSCALL_DEFINE2(msgget, key_t, key, int, msgflg)
293 {
294         return ksys_msgget(key, msgflg);
295 }
296 
297 static inline unsigned long
298 copy_msqid_to_user(void __user *buf, struct msqid64_ds *in, int version)
299 {
300         switch (version) {
301         case IPC_64:
302                 return copy_to_user(buf, in, sizeof(*in));
303         case IPC_OLD:
304         {
305                 struct msqid_ds out;
306 
307                 memset(&out, 0, sizeof(out));
308 
309                 ipc64_perm_to_ipc_perm(&in->msg_perm, &out.msg_perm);
310 
311                 out.msg_stime           = in->msg_stime;
312                 out.msg_rtime           = in->msg_rtime;
313                 out.msg_ctime           = in->msg_ctime;
314 
315                 if (in->msg_cbytes > USHRT_MAX)
316                         out.msg_cbytes  = USHRT_MAX;
317                 else
318                         out.msg_cbytes  = in->msg_cbytes;
319                 out.msg_lcbytes         = in->msg_cbytes;
320 
321                 if (in->msg_qnum > USHRT_MAX)
322                         out.msg_qnum    = USHRT_MAX;
323                 else
324                         out.msg_qnum    = in->msg_qnum;
325 
326                 if (in->msg_qbytes > USHRT_MAX)
327                         out.msg_qbytes  = USHRT_MAX;
328                 else
329                         out.msg_qbytes  = in->msg_qbytes;
330                 out.msg_lqbytes         = in->msg_qbytes;
331 
332                 out.msg_lspid           = in->msg_lspid;
333                 out.msg_lrpid           = in->msg_lrpid;
334 
335                 return copy_to_user(buf, &out, sizeof(out));
336         }
337         default:
338                 return -EINVAL;
339         }
340 }
341 
342 static inline unsigned long
343 copy_msqid_from_user(struct msqid64_ds *out, void __user *buf, int version)
344 {
345         switch (version) {
346         case IPC_64:
347                 if (copy_from_user(out, buf, sizeof(*out)))
348                         return -EFAULT;
349                 return 0;
350         case IPC_OLD:
351         {
352                 struct msqid_ds tbuf_old;
353 
354                 if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old)))
355                         return -EFAULT;
356 
357                 out->msg_perm.uid       = tbuf_old.msg_perm.uid;
358                 out->msg_perm.gid       = tbuf_old.msg_perm.gid;
359                 out->msg_perm.mode      = tbuf_old.msg_perm.mode;
360 
361                 if (tbuf_old.msg_qbytes == 0)
362                         out->msg_qbytes = tbuf_old.msg_lqbytes;
363                 else
364                         out->msg_qbytes = tbuf_old.msg_qbytes;
365 
366                 return 0;
367         }
368         default:
369                 return -EINVAL;
370         }
371 }
372 
373 /*
374  * This function handles some msgctl commands which require the rwsem
375  * to be held in write mode.
376  * NOTE: no locks must be held, the rwsem is taken inside this function.
377  */
378 static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd,
379                         struct msqid64_ds *msqid64)
380 {
381         struct kern_ipc_perm *ipcp;
382         struct msg_queue *msq;
383         int err;
384 
385         down_write(&msg_ids(ns).rwsem);
386         rcu_read_lock();
387 
388         ipcp = ipcctl_pre_down_nolock(ns, &msg_ids(ns), msqid, cmd,
389                                       &msqid64->msg_perm, msqid64->msg_qbytes);
390         if (IS_ERR(ipcp)) {
391                 err = PTR_ERR(ipcp);
392                 goto out_unlock1;
393         }
394 
395         msq = container_of(ipcp, struct msg_queue, q_perm);
396 
397         err = security_msg_queue_msgctl(&msq->q_perm, cmd);
398         if (err)
399                 goto out_unlock1;
400 
401         switch (cmd) {
402         case IPC_RMID:
403                 ipc_lock_object(&msq->q_perm);
404                 /* freeque unlocks the ipc object and rcu */
405                 freeque(ns, ipcp);
406                 goto out_up;
407         case IPC_SET:
408         {
409                 DEFINE_WAKE_Q(wake_q);
410 
411                 if (msqid64->msg_qbytes > ns->msg_ctlmnb &&
412                     !capable(CAP_SYS_RESOURCE)) {
413                         err = -EPERM;
414                         goto out_unlock1;
415                 }
416 
417                 ipc_lock_object(&msq->q_perm);
418                 err = ipc_update_perm(&msqid64->msg_perm, ipcp);
419                 if (err)
420                         goto out_unlock0;
421 
422                 msq->q_qbytes = msqid64->msg_qbytes;
423 
424                 msq->q_ctime = ktime_get_real_seconds();
425                 /*
426                  * Sleeping receivers might be excluded by
427                  * stricter permissions.
428                  */
429                 expunge_all(msq, -EAGAIN, &wake_q);
430                 /*
431                  * Sleeping senders might be able to send
432                  * due to a larger queue size.
433                  */
434                 ss_wakeup(msq, &wake_q, false);
435                 ipc_unlock_object(&msq->q_perm);
436                 wake_up_q(&wake_q);
437 
438                 goto out_unlock1;
439         }
440         default:
441                 err = -EINVAL;
442                 goto out_unlock1;
443         }
444 
445 out_unlock0:
446         ipc_unlock_object(&msq->q_perm);
447 out_unlock1:
448         rcu_read_unlock();
449 out_up:
450         up_write(&msg_ids(ns).rwsem);
451         return err;
452 }
453 
454 static int msgctl_info(struct ipc_namespace *ns, int msqid,
455                          int cmd, struct msginfo *msginfo)
456 {
457         int err;
458         int max_id;
459 
460         /*
461          * We must not return kernel stack data.
462          * due to padding, it's not enough
463          * to set all member fields.
464          */
465         err = security_msg_queue_msgctl(NULL, cmd);
466         if (err)
467                 return err;
468 
469         memset(msginfo, 0, sizeof(*msginfo));
470         msginfo->msgmni = ns->msg_ctlmni;
471         msginfo->msgmax = ns->msg_ctlmax;
472         msginfo->msgmnb = ns->msg_ctlmnb;
473         msginfo->msgssz = MSGSSZ;
474         msginfo->msgseg = MSGSEG;
475         down_read(&msg_ids(ns).rwsem);
476         if (cmd == MSG_INFO) {
477                 msginfo->msgpool = msg_ids(ns).in_use;
478                 msginfo->msgmap = atomic_read(&ns->msg_hdrs);
479                 msginfo->msgtql = atomic_read(&ns->msg_bytes);
480         } else {
481                 msginfo->msgmap = MSGMAP;
482                 msginfo->msgpool = MSGPOOL;
483                 msginfo->msgtql = MSGTQL;
484         }
485         max_id = ipc_get_maxid(&msg_ids(ns));
486         up_read(&msg_ids(ns).rwsem);
487         return (max_id < 0) ? 0 : max_id;
488 }
489 
490 static int msgctl_stat(struct ipc_namespace *ns, int msqid,
491                          int cmd, struct msqid64_ds *p)
492 {
493         struct msg_queue *msq;
494         int id = 0;
495         int err;
496 
497         memset(p, 0, sizeof(*p));
498 
499         rcu_read_lock();
500         if (cmd == MSG_STAT || cmd == MSG_STAT_ANY) {
501                 msq = msq_obtain_object(ns, msqid);
502                 if (IS_ERR(msq)) {
503                         err = PTR_ERR(msq);
504                         goto out_unlock;
505                 }
506                 id = msq->q_perm.id;
507         } else { /* IPC_STAT */
508                 msq = msq_obtain_object_check(ns, msqid);
509                 if (IS_ERR(msq)) {
510                         err = PTR_ERR(msq);
511                         goto out_unlock;
512                 }
513         }
514 
515         /* see comment for SHM_STAT_ANY */
516         if (cmd == MSG_STAT_ANY)
517                 audit_ipc_obj(&msq->q_perm);
518         else {
519                 err = -EACCES;
520                 if (ipcperms(ns, &msq->q_perm, S_IRUGO))
521                         goto out_unlock;
522         }
523 
524         err = security_msg_queue_msgctl(&msq->q_perm, cmd);
525         if (err)
526                 goto out_unlock;
527 
528         ipc_lock_object(&msq->q_perm);
529 
530         if (!ipc_valid_object(&msq->q_perm)) {
531                 ipc_unlock_object(&msq->q_perm);
532                 err = -EIDRM;
533                 goto out_unlock;
534         }
535 
536         kernel_to_ipc64_perm(&msq->q_perm, &p->msg_perm);
537         p->msg_stime  = msq->q_stime;
538         p->msg_rtime  = msq->q_rtime;
539         p->msg_ctime  = msq->q_ctime;
540 #ifndef CONFIG_64BIT
541         p->msg_stime_high = msq->q_stime >> 32;
542         p->msg_rtime_high = msq->q_rtime >> 32;
543         p->msg_ctime_high = msq->q_ctime >> 32;
544 #endif
545         p->msg_cbytes = msq->q_cbytes;
546         p->msg_qnum   = msq->q_qnum;
547         p->msg_qbytes = msq->q_qbytes;
548         p->msg_lspid  = pid_vnr(msq->q_lspid);
549         p->msg_lrpid  = pid_vnr(msq->q_lrpid);
550 
551         ipc_unlock_object(&msq->q_perm);
552         rcu_read_unlock();
553         return id;
554 
555 out_unlock:
556         rcu_read_unlock();
557         return err;
558 }
559 
560 long ksys_msgctl(int msqid, int cmd, struct msqid_ds __user *buf)
561 {
562         int version;
563         struct ipc_namespace *ns;
564         struct msqid64_ds msqid64;
565         int err;
566 
567         if (msqid < 0 || cmd < 0)
568                 return -EINVAL;
569 
570         version = ipc_parse_version(&cmd);
571         ns = current->nsproxy->ipc_ns;
572 
573         switch (cmd) {
574         case IPC_INFO:
575         case MSG_INFO: {
576                 struct msginfo msginfo;
577                 err = msgctl_info(ns, msqid, cmd, &msginfo);
578                 if (err < 0)
579                         return err;
580                 if (copy_to_user(buf, &msginfo, sizeof(struct msginfo)))
581                         err = -EFAULT;
582                 return err;
583         }
584         case MSG_STAT:  /* msqid is an index rather than a msg queue id */
585         case MSG_STAT_ANY:
586         case IPC_STAT:
587                 err = msgctl_stat(ns, msqid, cmd, &msqid64);
588                 if (err < 0)
589                         return err;
590                 if (copy_msqid_to_user(buf, &msqid64, version))
591                         err = -EFAULT;
592                 return err;
593         case IPC_SET:
594                 if (copy_msqid_from_user(&msqid64, buf, version))
595                         return -EFAULT;
596                 /* fallthru */
597         case IPC_RMID:
598                 return msgctl_down(ns, msqid, cmd, &msqid64);
599         default:
600                 return  -EINVAL;
601         }
602 }
603 
604 SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, struct msqid_ds __user *, buf)
605 {
606         return ksys_msgctl(msqid, cmd, buf);
607 }
608 
609 #ifdef CONFIG_COMPAT
610 
611 struct compat_msqid_ds {
612         struct compat_ipc_perm msg_perm;
613         compat_uptr_t msg_first;
614         compat_uptr_t msg_last;
615         compat_time_t msg_stime;
616         compat_time_t msg_rtime;
617         compat_time_t msg_ctime;
618         compat_ulong_t msg_lcbytes;
619         compat_ulong_t msg_lqbytes;
620         unsigned short msg_cbytes;
621         unsigned short msg_qnum;
622         unsigned short msg_qbytes;
623         compat_ipc_pid_t msg_lspid;
624         compat_ipc_pid_t msg_lrpid;
625 };
626 
627 static int copy_compat_msqid_from_user(struct msqid64_ds *out, void __user *buf,
628                                         int version)
629 {
630         memset(out, 0, sizeof(*out));
631         if (version == IPC_64) {
632                 struct compat_msqid64_ds __user *p = buf;
633                 if (get_compat_ipc64_perm(&out->msg_perm, &p->msg_perm))
634                         return -EFAULT;
635                 if (get_user(out->msg_qbytes, &p->msg_qbytes))
636                         return -EFAULT;
637         } else {
638                 struct compat_msqid_ds __user *p = buf;
639                 if (get_compat_ipc_perm(&out->msg_perm, &p->msg_perm))
640                         return -EFAULT;
641                 if (get_user(out->msg_qbytes, &p->msg_qbytes))
642                         return -EFAULT;
643         }
644         return 0;
645 }
646 
647 static int copy_compat_msqid_to_user(void __user *buf, struct msqid64_ds *in,
648                                         int version)
649 {
650         if (version == IPC_64) {
651                 struct compat_msqid64_ds v;
652                 memset(&v, 0, sizeof(v));
653                 to_compat_ipc64_perm(&v.msg_perm, &in->msg_perm);
654                 v.msg_stime      = lower_32_bits(in->msg_stime);
655                 v.msg_stime_high = upper_32_bits(in->msg_stime);
656                 v.msg_rtime      = lower_32_bits(in->msg_rtime);
657                 v.msg_rtime_high = upper_32_bits(in->msg_rtime);
658                 v.msg_ctime      = lower_32_bits(in->msg_ctime);
659                 v.msg_ctime_high = upper_32_bits(in->msg_ctime);
660                 v.msg_cbytes = in->msg_cbytes;
661                 v.msg_qnum = in->msg_qnum;
662                 v.msg_qbytes = in->msg_qbytes;
663                 v.msg_lspid = in->msg_lspid;
664                 v.msg_lrpid = in->msg_lrpid;
665                 return copy_to_user(buf, &v, sizeof(v));
666         } else {
667                 struct compat_msqid_ds v;
668                 memset(&v, 0, sizeof(v));
669                 to_compat_ipc_perm(&v.msg_perm, &in->msg_perm);
670                 v.msg_stime = in->msg_stime;
671                 v.msg_rtime = in->msg_rtime;
672                 v.msg_ctime = in->msg_ctime;
673                 v.msg_cbytes = in->msg_cbytes;
674                 v.msg_qnum = in->msg_qnum;
675                 v.msg_qbytes = in->msg_qbytes;
676                 v.msg_lspid = in->msg_lspid;
677                 v.msg_lrpid = in->msg_lrpid;
678                 return copy_to_user(buf, &v, sizeof(v));
679         }
680 }
681 
682 long compat_ksys_msgctl(int msqid, int cmd, void __user *uptr)
683 {
684         struct ipc_namespace *ns;
685         int err;
686         struct msqid64_ds msqid64;
687         int version = compat_ipc_parse_version(&cmd);
688 
689         ns = current->nsproxy->ipc_ns;
690 
691         if (msqid < 0 || cmd < 0)
692                 return -EINVAL;
693 
694         switch (cmd & (~IPC_64)) {
695         case IPC_INFO:
696         case MSG_INFO: {
697                 struct msginfo msginfo;
698                 err = msgctl_info(ns, msqid, cmd, &msginfo);
699                 if (err < 0)
700                         return err;
701                 if (copy_to_user(uptr, &msginfo, sizeof(struct msginfo)))
702                         err = -EFAULT;
703                 return err;
704         }
705         case IPC_STAT:
706         case MSG_STAT:
707         case MSG_STAT_ANY:
708                 err = msgctl_stat(ns, msqid, cmd, &msqid64);
709                 if (err < 0)
710                         return err;
711                 if (copy_compat_msqid_to_user(uptr, &msqid64, version))
712                         err = -EFAULT;
713                 return err;
714         case IPC_SET:
715                 if (copy_compat_msqid_from_user(&msqid64, uptr, version))
716                         return -EFAULT;
717                 /* fallthru */
718         case IPC_RMID:
719                 return msgctl_down(ns, msqid, cmd, &msqid64);
720         default:
721                 return -EINVAL;
722         }
723 }
724 
725 COMPAT_SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, void __user *, uptr)
726 {
727         return compat_ksys_msgctl(msqid, cmd, uptr);
728 }
729 #endif
730 
731 static int testmsg(struct msg_msg *msg, long type, int mode)
732 {
733         switch (mode) {
734         case SEARCH_ANY:
735         case SEARCH_NUMBER:
736                 return 1;
737         case SEARCH_LESSEQUAL:
738                 if (msg->m_type <= type)
739                         return 1;
740                 break;
741         case SEARCH_EQUAL:
742                 if (msg->m_type == type)
743                         return 1;
744                 break;
745         case SEARCH_NOTEQUAL:
746                 if (msg->m_type != type)
747                         return 1;
748                 break;
749         }
750         return 0;
751 }
752 
753 static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg,
754                                  struct wake_q_head *wake_q)
755 {
756         struct msg_receiver *msr, *t;
757 
758         list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) {
759                 if (testmsg(msg, msr->r_msgtype, msr->r_mode) &&
760                     !security_msg_queue_msgrcv(&msq->q_perm, msg, msr->r_tsk,
761                                                msr->r_msgtype, msr->r_mode)) {
762 
763                         list_del(&msr->r_list);
764                         if (msr->r_maxsize < msg->m_ts) {
765                                 wake_q_add(wake_q, msr->r_tsk);
766                                 WRITE_ONCE(msr->r_msg, ERR_PTR(-E2BIG));
767                         } else {
768                                 ipc_update_pid(&msq->q_lrpid, task_pid(msr->r_tsk));
769                                 msq->q_rtime = ktime_get_real_seconds();
770 
771                                 wake_q_add(wake_q, msr->r_tsk);
772                                 WRITE_ONCE(msr->r_msg, msg);
773                                 return 1;
774                         }
775                 }
776         }
777 
778         return 0;
779 }
780 
781 static long do_msgsnd(int msqid, long mtype, void __user *mtext,
782                 size_t msgsz, int msgflg)
783 {
784         struct msg_queue *msq;
785         struct msg_msg *msg;
786         int err;
787         struct ipc_namespace *ns;
788         DEFINE_WAKE_Q(wake_q);
789 
790         ns = current->nsproxy->ipc_ns;
791 
792         if (msgsz > ns->msg_ctlmax || (long) msgsz < 0 || msqid < 0)
793                 return -EINVAL;
794         if (mtype < 1)
795                 return -EINVAL;
796 
797         msg = load_msg(mtext, msgsz);
798         if (IS_ERR(msg))
799                 return PTR_ERR(msg);
800 
801         msg->m_type = mtype;
802         msg->m_ts = msgsz;
803 
804         rcu_read_lock();
805         msq = msq_obtain_object_check(ns, msqid);
806         if (IS_ERR(msq)) {
807                 err = PTR_ERR(msq);
808                 goto out_unlock1;
809         }
810 
811         ipc_lock_object(&msq->q_perm);
812 
813         for (;;) {
814                 struct msg_sender s;
815 
816                 err = -EACCES;
817                 if (ipcperms(ns, &msq->q_perm, S_IWUGO))
818                         goto out_unlock0;
819 
820                 /* raced with RMID? */
821                 if (!ipc_valid_object(&msq->q_perm)) {
822                         err = -EIDRM;
823                         goto out_unlock0;
824                 }
825 
826                 err = security_msg_queue_msgsnd(&msq->q_perm, msg, msgflg);
827                 if (err)
828                         goto out_unlock0;
829 
830                 if (msg_fits_inqueue(msq, msgsz))
831                         break;
832 
833                 /* queue full, wait: */
834                 if (msgflg & IPC_NOWAIT) {
835                         err = -EAGAIN;
836                         goto out_unlock0;
837                 }
838 
839                 /* enqueue the sender and prepare to block */
840                 ss_add(msq, &s, msgsz);
841 
842                 if (!ipc_rcu_getref(&msq->q_perm)) {
843                         err = -EIDRM;
844                         goto out_unlock0;
845                 }
846 
847                 ipc_unlock_object(&msq->q_perm);
848                 rcu_read_unlock();
849                 schedule();
850 
851                 rcu_read_lock();
852                 ipc_lock_object(&msq->q_perm);
853 
854                 ipc_rcu_putref(&msq->q_perm, msg_rcu_free);
855                 /* raced with RMID? */
856                 if (!ipc_valid_object(&msq->q_perm)) {
857                         err = -EIDRM;
858                         goto out_unlock0;
859                 }
860                 ss_del(&s);
861 
862                 if (signal_pending(current)) {
863                         err = -ERESTARTNOHAND;
864                         goto out_unlock0;
865                 }
866 
867         }
868 
869         ipc_update_pid(&msq->q_lspid, task_tgid(current));
870         msq->q_stime = ktime_get_real_seconds();
871 
872         if (!pipelined_send(msq, msg, &wake_q)) {
873                 /* no one is waiting for this message, enqueue it */
874                 list_add_tail(&msg->m_list, &msq->q_messages);
875                 msq->q_cbytes += msgsz;
876                 msq->q_qnum++;
877                 atomic_add(msgsz, &ns->msg_bytes);
878                 atomic_inc(&ns->msg_hdrs);
879         }
880 
881         err = 0;
882         msg = NULL;
883 
884 out_unlock0:
885         ipc_unlock_object(&msq->q_perm);
886         wake_up_q(&wake_q);
887 out_unlock1:
888         rcu_read_unlock();
889         if (msg != NULL)
890                 free_msg(msg);
891         return err;
892 }
893 
894 long ksys_msgsnd(int msqid, struct msgbuf __user *msgp, size_t msgsz,
895                  int msgflg)
896 {
897         long mtype;
898 
899         if (get_user(mtype, &msgp->mtype))
900                 return -EFAULT;
901         return do_msgsnd(msqid, mtype, msgp->mtext, msgsz, msgflg);
902 }
903 
904 SYSCALL_DEFINE4(msgsnd, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz,
905                 int, msgflg)
906 {
907         return ksys_msgsnd(msqid, msgp, msgsz, msgflg);
908 }
909 
910 #ifdef CONFIG_COMPAT
911 
912 struct compat_msgbuf {
913         compat_long_t mtype;
914         char mtext[1];
915 };
916 
917 long compat_ksys_msgsnd(int msqid, compat_uptr_t msgp,
918                        compat_ssize_t msgsz, int msgflg)
919 {
920         struct compat_msgbuf __user *up = compat_ptr(msgp);
921         compat_long_t mtype;
922 
923         if (get_user(mtype, &up->mtype))
924                 return -EFAULT;
925         return do_msgsnd(msqid, mtype, up->mtext, (ssize_t)msgsz, msgflg);
926 }
927 
928 COMPAT_SYSCALL_DEFINE4(msgsnd, int, msqid, compat_uptr_t, msgp,
929                        compat_ssize_t, msgsz, int, msgflg)
930 {
931         return compat_ksys_msgsnd(msqid, msgp, msgsz, msgflg);
932 }
933 #endif
934 
935 static inline int convert_mode(long *msgtyp, int msgflg)
936 {
937         if (msgflg & MSG_COPY)
938                 return SEARCH_NUMBER;
939         /*
940          *  find message of correct type.
941          *  msgtyp = 0 => get first.
942          *  msgtyp > 0 => get first message of matching type.
943          *  msgtyp < 0 => get message with least type must be < abs(msgtype).
944          */
945         if (*msgtyp == 0)
946                 return SEARCH_ANY;
947         if (*msgtyp < 0) {
948                 if (*msgtyp == LONG_MIN) /* -LONG_MIN is undefined */
949                         *msgtyp = LONG_MAX;
950                 else
951                         *msgtyp = -*msgtyp;
952                 return SEARCH_LESSEQUAL;
953         }
954         if (msgflg & MSG_EXCEPT)
955                 return SEARCH_NOTEQUAL;
956         return SEARCH_EQUAL;
957 }
958 
959 static long do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz)
960 {
961         struct msgbuf __user *msgp = dest;
962         size_t msgsz;
963 
964         if (put_user(msg->m_type, &msgp->mtype))
965                 return -EFAULT;
966 
967         msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz;
968         if (store_msg(msgp->mtext, msg, msgsz))
969                 return -EFAULT;
970         return msgsz;
971 }
972 
973 #ifdef CONFIG_CHECKPOINT_RESTORE
974 /*
975  * This function creates new kernel message structure, large enough to store
976  * bufsz message bytes.
977  */
978 static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz)
979 {
980         struct msg_msg *copy;
981 
982         /*
983          * Create dummy message to copy real message to.
984          */
985         copy = load_msg(buf, bufsz);
986         if (!IS_ERR(copy))
987                 copy->m_ts = bufsz;
988         return copy;
989 }
990 
991 static inline void free_copy(struct msg_msg *copy)
992 {
993         if (copy)
994                 free_msg(copy);
995 }
996 #else
997 static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz)
998 {
999         return ERR_PTR(-ENOSYS);
1000 }
1001 
1002 static inline void free_copy(struct msg_msg *copy)
1003 {
1004 }
1005 #endif
1006 
1007 static struct msg_msg *find_msg(struct msg_queue *msq, long *msgtyp, int mode)
1008 {
1009         struct msg_msg *msg, *found = NULL;
1010         long count = 0;
1011 
1012         list_for_each_entry(msg, &msq->q_messages, m_list) {
1013                 if (testmsg(msg, *msgtyp, mode) &&
1014                     !security_msg_queue_msgrcv(&msq->q_perm, msg, current,
1015                                                *msgtyp, mode)) {
1016                         if (mode == SEARCH_LESSEQUAL && msg->m_type != 1) {
1017                                 *msgtyp = msg->m_type - 1;
1018                                 found = msg;
1019                         } else if (mode == SEARCH_NUMBER) {
1020                                 if (*msgtyp == count)
1021                                         return msg;
1022                         } else
1023                                 return msg;
1024                         count++;
1025                 }
1026         }
1027 
1028         return found ?: ERR_PTR(-EAGAIN);
1029 }
1030 
1031 static long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, int msgflg,
1032                long (*msg_handler)(void __user *, struct msg_msg *, size_t))
1033 {
1034         int mode;
1035         struct msg_queue *msq;
1036         struct ipc_namespace *ns;
1037         struct msg_msg *msg, *copy = NULL;
1038         DEFINE_WAKE_Q(wake_q);
1039 
1040         ns = current->nsproxy->ipc_ns;
1041 
1042         if (msqid < 0 || (long) bufsz < 0)
1043                 return -EINVAL;
1044 
1045         if (msgflg & MSG_COPY) {
1046                 if ((msgflg & MSG_EXCEPT) || !(msgflg & IPC_NOWAIT))
1047                         return -EINVAL;
1048                 copy = prepare_copy(buf, min_t(size_t, bufsz, ns->msg_ctlmax));
1049                 if (IS_ERR(copy))
1050                         return PTR_ERR(copy);
1051         }
1052         mode = convert_mode(&msgtyp, msgflg);
1053 
1054         rcu_read_lock();
1055         msq = msq_obtain_object_check(ns, msqid);
1056         if (IS_ERR(msq)) {
1057                 rcu_read_unlock();
1058                 free_copy(copy);
1059                 return PTR_ERR(msq);
1060         }
1061 
1062         for (;;) {
1063                 struct msg_receiver msr_d;
1064 
1065                 msg = ERR_PTR(-EACCES);
1066                 if (ipcperms(ns, &msq->q_perm, S_IRUGO))
1067                         goto out_unlock1;
1068 
1069                 ipc_lock_object(&msq->q_perm);
1070 
1071                 /* raced with RMID? */
1072                 if (!ipc_valid_object(&msq->q_perm)) {
1073                         msg = ERR_PTR(-EIDRM);
1074                         goto out_unlock0;
1075                 }
1076 
1077                 msg = find_msg(msq, &msgtyp, mode);
1078                 if (!IS_ERR(msg)) {
1079                         /*
1080                          * Found a suitable message.
1081                          * Unlink it from the queue.
1082                          */
1083                         if ((bufsz < msg->m_ts) && !(msgflg & MSG_NOERROR)) {
1084                                 msg = ERR_PTR(-E2BIG);
1085                                 goto out_unlock0;
1086                         }
1087                         /*
1088                          * If we are copying, then do not unlink message and do
1089                          * not update queue parameters.
1090                          */
1091                         if (msgflg & MSG_COPY) {
1092                                 msg = copy_msg(msg, copy);
1093                                 goto out_unlock0;
1094                         }
1095 
1096                         list_del(&msg->m_list);
1097                         msq->q_qnum--;
1098                         msq->q_rtime = ktime_get_real_seconds();
1099                         ipc_update_pid(&msq->q_lrpid, task_tgid(current));
1100                         msq->q_cbytes -= msg->m_ts;
1101                         atomic_sub(msg->m_ts, &ns->msg_bytes);
1102                         atomic_dec(&ns->msg_hdrs);
1103                         ss_wakeup(msq, &wake_q, false);
1104 
1105                         goto out_unlock0;
1106                 }
1107 
1108                 /* No message waiting. Wait for a message */
1109                 if (msgflg & IPC_NOWAIT) {
1110                         msg = ERR_PTR(-ENOMSG);
1111                         goto out_unlock0;
1112                 }
1113 
1114                 list_add_tail(&msr_d.r_list, &msq->q_receivers);
1115                 msr_d.r_tsk = current;
1116                 msr_d.r_msgtype = msgtyp;
1117                 msr_d.r_mode = mode;
1118                 if (msgflg & MSG_NOERROR)
1119                         msr_d.r_maxsize = INT_MAX;
1120                 else
1121                         msr_d.r_maxsize = bufsz;
1122                 msr_d.r_msg = ERR_PTR(-EAGAIN);
1123                 __set_current_state(TASK_INTERRUPTIBLE);
1124 
1125                 ipc_unlock_object(&msq->q_perm);
1126                 rcu_read_unlock();
1127                 schedule();
1128 
1129                 /*
1130                  * Lockless receive, part 1:
1131                  * We don't hold a reference to the queue and getting a
1132                  * reference would defeat the idea of a lockless operation,
1133                  * thus the code relies on rcu to guarantee the existence of
1134                  * msq:
1135                  * Prior to destruction, expunge_all(-EIRDM) changes r_msg.
1136                  * Thus if r_msg is -EAGAIN, then the queue not yet destroyed.
1137                  */
1138                 rcu_read_lock();
1139 
1140                 /*
1141                  * Lockless receive, part 2:
1142                  * The work in pipelined_send() and expunge_all():
1143                  * - Set pointer to message
1144                  * - Queue the receiver task for later wakeup
1145                  * - Wake up the process after the lock is dropped.
1146                  *
1147                  * Should the process wake up before this wakeup (due to a
1148                  * signal) it will either see the message and continue ...
1149                  */
1150                 msg = READ_ONCE(msr_d.r_msg);
1151                 if (msg != ERR_PTR(-EAGAIN))
1152                         goto out_unlock1;
1153 
1154                  /*
1155                   * ... or see -EAGAIN, acquire the lock to check the message
1156                   * again.
1157                   */
1158                 ipc_lock_object(&msq->q_perm);
1159 
1160                 msg = msr_d.r_msg;
1161                 if (msg != ERR_PTR(-EAGAIN))
1162                         goto out_unlock0;
1163 
1164                 list_del(&msr_d.r_list);
1165                 if (signal_pending(current)) {
1166                         msg = ERR_PTR(-ERESTARTNOHAND);
1167                         goto out_unlock0;
1168                 }
1169 
1170                 ipc_unlock_object(&msq->q_perm);
1171         }
1172 
1173 out_unlock0:
1174         ipc_unlock_object(&msq->q_perm);
1175         wake_up_q(&wake_q);
1176 out_unlock1:
1177         rcu_read_unlock();
1178         if (IS_ERR(msg)) {
1179                 free_copy(copy);
1180                 return PTR_ERR(msg);
1181         }
1182 
1183         bufsz = msg_handler(buf, msg, bufsz);
1184         free_msg(msg);
1185 
1186         return bufsz;
1187 }
1188 
1189 long ksys_msgrcv(int msqid, struct msgbuf __user *msgp, size_t msgsz,
1190                  long msgtyp, int msgflg)
1191 {
1192         return do_msgrcv(msqid, msgp, msgsz, msgtyp, msgflg, do_msg_fill);
1193 }
1194 
1195 SYSCALL_DEFINE5(msgrcv, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz,
1196                 long, msgtyp, int, msgflg)
1197 {
1198         return ksys_msgrcv(msqid, msgp, msgsz, msgtyp, msgflg);
1199 }
1200 
1201 #ifdef CONFIG_COMPAT
1202 static long compat_do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz)
1203 {
1204         struct compat_msgbuf __user *msgp = dest;
1205         size_t msgsz;
1206 
1207         if (put_user(msg->m_type, &msgp->mtype))
1208                 return -EFAULT;
1209 
1210         msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz;
1211         if (store_msg(msgp->mtext, msg, msgsz))
1212                 return -EFAULT;
1213         return msgsz;
1214 }
1215 
1216 long compat_ksys_msgrcv(int msqid, compat_uptr_t msgp, compat_ssize_t msgsz,
1217                         compat_long_t msgtyp, int msgflg)
1218 {
1219         return do_msgrcv(msqid, compat_ptr(msgp), (ssize_t)msgsz, (long)msgtyp,
1220                          msgflg, compat_do_msg_fill);
1221 }
1222 
1223 COMPAT_SYSCALL_DEFINE5(msgrcv, int, msqid, compat_uptr_t, msgp,
1224                        compat_ssize_t, msgsz, compat_long_t, msgtyp,
1225                        int, msgflg)
1226 {
1227         return compat_ksys_msgrcv(msqid, msgp, msgsz, msgtyp, msgflg);
1228 }
1229 #endif
1230 
1231 int msg_init_ns(struct ipc_namespace *ns)
1232 {
1233         ns->msg_ctlmax = MSGMAX;
1234         ns->msg_ctlmnb = MSGMNB;
1235         ns->msg_ctlmni = MSGMNI;
1236 
1237         atomic_set(&ns->msg_bytes, 0);
1238         atomic_set(&ns->msg_hdrs, 0);
1239         return ipc_init_ids(&ns->ids[IPC_MSG_IDS]);
1240 }
1241 
1242 #ifdef CONFIG_IPC_NS
1243 void msg_exit_ns(struct ipc_namespace *ns)
1244 {
1245         free_ipcs(ns, &msg_ids(ns), freeque);
1246         idr_destroy(&ns->ids[IPC_MSG_IDS].ipcs_idr);
1247         rhashtable_destroy(&ns->ids[IPC_MSG_IDS].key_ht);
1248 }
1249 #endif
1250 
1251 #ifdef CONFIG_PROC_FS
1252 static int sysvipc_msg_proc_show(struct seq_file *s, void *it)
1253 {
1254         struct pid_namespace *pid_ns = ipc_seq_pid_ns(s);
1255         struct user_namespace *user_ns = seq_user_ns(s);
1256         struct kern_ipc_perm *ipcp = it;
1257         struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm);
1258 
1259         seq_printf(s,
1260                    "%10d %10d  %4o  %10lu %10lu %5u %5u %5u %5u %5u %5u %10llu %10llu %10llu\n",
1261                    msq->q_perm.key,
1262                    msq->q_perm.id,
1263                    msq->q_perm.mode,
1264                    msq->q_cbytes,
1265                    msq->q_qnum,
1266                    pid_nr_ns(msq->q_lspid, pid_ns),
1267                    pid_nr_ns(msq->q_lrpid, pid_ns),
1268                    from_kuid_munged(user_ns, msq->q_perm.uid),
1269                    from_kgid_munged(user_ns, msq->q_perm.gid),
1270                    from_kuid_munged(user_ns, msq->q_perm.cuid),
1271                    from_kgid_munged(user_ns, msq->q_perm.cgid),
1272                    msq->q_stime,
1273                    msq->q_rtime,
1274                    msq->q_ctime);
1275 
1276         return 0;
1277 }
1278 #endif
1279 
1280 int __init msg_init(void)
1281 {
1282         const int err = msg_init_ns(&init_ipc_ns);
1283 
1284         ipc_init_proc_interface("sysvipc/msg",
1285                                 "       key      msqid perms      cbytes       qnum lspid lrpid   uid   gid  cuid  cgid      stime      rtime      ctime\n",
1286                                 IPC_MSG_IDS, sysvipc_msg_proc_show);
1287         return err;
1288 }
1289 

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