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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 msg_receiver structure for each sleeping receiver */ | |
47 | struct msg_receiver { | |
48 | struct list_head r_list; | |
49 | struct task_struct *r_tsk; | |
50 | ||
51 | int r_mode; | |
52 | long r_msgtype; | |
53 | long r_maxsize; | |
54 | ||
55 | struct msg_msg *r_msg; | |
56 | }; | |
57 | ||
58 | /* one msg_sender for each sleeping sender */ | |
59 | struct msg_sender { | |
60 | struct list_head list; | |
61 | struct task_struct *tsk; | |
62 | size_t msgsz; | |
63 | }; | |
64 | ||
65 | #define SEARCH_ANY 1 | |
66 | #define SEARCH_EQUAL 2 | |
67 | #define SEARCH_NOTEQUAL 3 | |
68 | #define SEARCH_LESSEQUAL 4 | |
69 | #define SEARCH_NUMBER 5 | |
70 | ||
71 | #define msg_ids(ns) ((ns)->ids[IPC_MSG_IDS]) | |
72 | ||
73 | static inline struct msg_queue *msq_obtain_object(struct ipc_namespace *ns, int id) | |
74 | { | |
75 | struct kern_ipc_perm *ipcp = ipc_obtain_object_idr(&msg_ids(ns), id); | |
76 | ||
77 | if (IS_ERR(ipcp)) | |
78 | return ERR_CAST(ipcp); | |
79 | ||
80 | return container_of(ipcp, struct msg_queue, q_perm); | |
81 | } | |
82 | ||
83 | static inline struct msg_queue *msq_obtain_object_check(struct ipc_namespace *ns, | |
84 | int id) | |
85 | { | |
86 | struct kern_ipc_perm *ipcp = ipc_obtain_object_check(&msg_ids(ns), id); | |
87 | ||
88 | if (IS_ERR(ipcp)) | |
89 | return ERR_CAST(ipcp); | |
90 | ||
91 | return container_of(ipcp, struct msg_queue, q_perm); | |
92 | } | |
93 | ||
94 | static inline void msg_rmid(struct ipc_namespace *ns, struct msg_queue *s) | |
95 | { | |
96 | ipc_rmid(&msg_ids(ns), &s->q_perm); | |
97 | } | |
98 | ||
99 | static void msg_rcu_free(struct rcu_head *head) | |
100 | { | |
101 | struct kern_ipc_perm *p = container_of(head, struct kern_ipc_perm, rcu); | |
102 | struct msg_queue *msq = container_of(p, struct msg_queue, q_perm); | |
103 | ||
104 | security_msg_queue_free(msq); | |
105 | kvfree(msq); | |
106 | } | |
107 | ||
108 | /** | |
109 | * newque - Create a new msg queue | |
110 | * @ns: namespace | |
111 | * @params: ptr to the structure that contains the key and msgflg | |
112 | * | |
113 | * Called with msg_ids.rwsem held (writer) | |
114 | */ | |
115 | static int newque(struct ipc_namespace *ns, struct ipc_params *params) | |
116 | { | |
117 | struct msg_queue *msq; | |
118 | int retval; | |
119 | key_t key = params->key; | |
120 | int msgflg = params->flg; | |
121 | ||
122 | msq = kvmalloc(sizeof(*msq), GFP_KERNEL); | |
123 | if (unlikely(!msq)) | |
124 | return -ENOMEM; | |
125 | ||
126 | msq->q_perm.mode = msgflg & S_IRWXUGO; | |
127 | msq->q_perm.key = key; | |
128 | ||
129 | msq->q_perm.security = NULL; | |
130 | retval = security_msg_queue_alloc(msq); | |
131 | if (retval) { | |
132 | kvfree(msq); | |
133 | return retval; | |
134 | } | |
135 | ||
136 | msq->q_stime = msq->q_rtime = 0; | |
137 | msq->q_ctime = ktime_get_real_seconds(); | |
138 | msq->q_cbytes = msq->q_qnum = 0; | |
139 | msq->q_qbytes = ns->msg_ctlmnb; | |
140 | msq->q_lspid = msq->q_lrpid = 0; | |
141 | INIT_LIST_HEAD(&msq->q_messages); | |
142 | INIT_LIST_HEAD(&msq->q_receivers); | |
143 | INIT_LIST_HEAD(&msq->q_senders); | |
144 | ||
145 | /* ipc_addid() locks msq upon success. */ | |
146 | retval = ipc_addid(&msg_ids(ns), &msq->q_perm, ns->msg_ctlmni); | |
147 | if (retval < 0) { | |
148 | call_rcu(&msq->q_perm.rcu, msg_rcu_free); | |
149 | return retval; | |
150 | } | |
151 | ||
152 | ipc_unlock_object(&msq->q_perm); | |
153 | rcu_read_unlock(); | |
154 | ||
155 | return msq->q_perm.id; | |
156 | } | |
157 | ||
158 | static inline bool msg_fits_inqueue(struct msg_queue *msq, size_t msgsz) | |
159 | { | |
160 | return msgsz + msq->q_cbytes <= msq->q_qbytes && | |
161 | 1 + msq->q_qnum <= msq->q_qbytes; | |
162 | } | |
163 | ||
164 | static inline void ss_add(struct msg_queue *msq, | |
165 | struct msg_sender *mss, size_t msgsz) | |
166 | { | |
167 | mss->tsk = current; | |
168 | mss->msgsz = msgsz; | |
169 | __set_current_state(TASK_INTERRUPTIBLE); | |
170 | list_add_tail(&mss->list, &msq->q_senders); | |
171 | } | |
172 | ||
173 | static inline void ss_del(struct msg_sender *mss) | |
174 | { | |
175 | if (mss->list.next) | |
176 | list_del(&mss->list); | |
177 | } | |
178 | ||
179 | static void ss_wakeup(struct msg_queue *msq, | |
180 | struct wake_q_head *wake_q, bool kill) | |
181 | { | |
182 | struct msg_sender *mss, *t; | |
183 | struct task_struct *stop_tsk = NULL; | |
184 | struct list_head *h = &msq->q_senders; | |
185 | ||
186 | list_for_each_entry_safe(mss, t, h, list) { | |
187 | if (kill) | |
188 | mss->list.next = NULL; | |
189 | ||
190 | /* | |
191 | * Stop at the first task we don't wakeup, | |
192 | * we've already iterated the original | |
193 | * sender queue. | |
194 | */ | |
195 | else if (stop_tsk == mss->tsk) | |
196 | break; | |
197 | /* | |
198 | * We are not in an EIDRM scenario here, therefore | |
199 | * verify that we really need to wakeup the task. | |
200 | * To maintain current semantics and wakeup order, | |
201 | * move the sender to the tail on behalf of the | |
202 | * blocked task. | |
203 | */ | |
204 | else if (!msg_fits_inqueue(msq, mss->msgsz)) { | |
205 | if (!stop_tsk) | |
206 | stop_tsk = mss->tsk; | |
207 | ||
208 | list_move_tail(&mss->list, &msq->q_senders); | |
209 | continue; | |
210 | } | |
211 | ||
212 | wake_q_add(wake_q, mss->tsk); | |
213 | } | |
214 | } | |
215 | ||
216 | static void expunge_all(struct msg_queue *msq, int res, | |
217 | struct wake_q_head *wake_q) | |
218 | { | |
219 | struct msg_receiver *msr, *t; | |
220 | ||
221 | list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) { | |
222 | wake_q_add(wake_q, msr->r_tsk); | |
223 | WRITE_ONCE(msr->r_msg, ERR_PTR(res)); | |
224 | } | |
225 | } | |
226 | ||
227 | /* | |
228 | * freeque() wakes up waiters on the sender and receiver waiting queue, | |
229 | * removes the message queue from message queue ID IDR, and cleans up all the | |
230 | * messages associated with this queue. | |
231 | * | |
232 | * msg_ids.rwsem (writer) and the spinlock for this message queue are held | |
233 | * before freeque() is called. msg_ids.rwsem remains locked on exit. | |
234 | */ | |
235 | static void freeque(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp) | |
236 | { | |
237 | struct msg_msg *msg, *t; | |
238 | struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm); | |
239 | DEFINE_WAKE_Q(wake_q); | |
240 | ||
241 | expunge_all(msq, -EIDRM, &wake_q); | |
242 | ss_wakeup(msq, &wake_q, true); | |
243 | msg_rmid(ns, msq); | |
244 | ipc_unlock_object(&msq->q_perm); | |
245 | wake_up_q(&wake_q); | |
246 | rcu_read_unlock(); | |
247 | ||
248 | list_for_each_entry_safe(msg, t, &msq->q_messages, m_list) { | |
249 | atomic_dec(&ns->msg_hdrs); | |
250 | free_msg(msg); | |
251 | } | |
252 | atomic_sub(msq->q_cbytes, &ns->msg_bytes); | |
253 | ipc_rcu_putref(&msq->q_perm, msg_rcu_free); | |
254 | } | |
255 | ||
256 | /* | |
257 | * Called with msg_ids.rwsem and ipcp locked. | |
258 | */ | |
259 | static inline int msg_security(struct kern_ipc_perm *ipcp, int msgflg) | |
260 | { | |
261 | struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm); | |
262 | ||
263 | return security_msg_queue_associate(msq, msgflg); | |
264 | } | |
265 | ||
266 | SYSCALL_DEFINE2(msgget, key_t, key, int, msgflg) | |
267 | { | |
268 | struct ipc_namespace *ns; | |
269 | static const struct ipc_ops msg_ops = { | |
270 | .getnew = newque, | |
271 | .associate = msg_security, | |
272 | }; | |
273 | struct ipc_params msg_params; | |
274 | ||
275 | ns = current->nsproxy->ipc_ns; | |
276 | ||
277 | msg_params.key = key; | |
278 | msg_params.flg = msgflg; | |
279 | ||
280 | return ipcget(ns, &msg_ids(ns), &msg_ops, &msg_params); | |
281 | } | |
282 | ||
283 | static inline unsigned long | |
284 | copy_msqid_to_user(void __user *buf, struct msqid64_ds *in, int version) | |
285 | { | |
286 | switch (version) { | |
287 | case IPC_64: | |
288 | return copy_to_user(buf, in, sizeof(*in)); | |
289 | case IPC_OLD: | |
290 | { | |
291 | struct msqid_ds out; | |
292 | ||
293 | memset(&out, 0, sizeof(out)); | |
294 | ||
295 | ipc64_perm_to_ipc_perm(&in->msg_perm, &out.msg_perm); | |
296 | ||
297 | out.msg_stime = in->msg_stime; | |
298 | out.msg_rtime = in->msg_rtime; | |
299 | out.msg_ctime = in->msg_ctime; | |
300 | ||
301 | if (in->msg_cbytes > USHRT_MAX) | |
302 | out.msg_cbytes = USHRT_MAX; | |
303 | else | |
304 | out.msg_cbytes = in->msg_cbytes; | |
305 | out.msg_lcbytes = in->msg_cbytes; | |
306 | ||
307 | if (in->msg_qnum > USHRT_MAX) | |
308 | out.msg_qnum = USHRT_MAX; | |
309 | else | |
310 | out.msg_qnum = in->msg_qnum; | |
311 | ||
312 | if (in->msg_qbytes > USHRT_MAX) | |
313 | out.msg_qbytes = USHRT_MAX; | |
314 | else | |
315 | out.msg_qbytes = in->msg_qbytes; | |
316 | out.msg_lqbytes = in->msg_qbytes; | |
317 | ||
318 | out.msg_lspid = in->msg_lspid; | |
319 | out.msg_lrpid = in->msg_lrpid; | |
320 | ||
321 | return copy_to_user(buf, &out, sizeof(out)); | |
322 | } | |
323 | default: | |
324 | return -EINVAL; | |
325 | } | |
326 | } | |
327 | ||
328 | static inline unsigned long | |
329 | copy_msqid_from_user(struct msqid64_ds *out, void __user *buf, int version) | |
330 | { | |
331 | switch (version) { | |
332 | case IPC_64: | |
333 | if (copy_from_user(out, buf, sizeof(*out))) | |
334 | return -EFAULT; | |
335 | return 0; | |
336 | case IPC_OLD: | |
337 | { | |
338 | struct msqid_ds tbuf_old; | |
339 | ||
340 | if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old))) | |
341 | return -EFAULT; | |
342 | ||
343 | out->msg_perm.uid = tbuf_old.msg_perm.uid; | |
344 | out->msg_perm.gid = tbuf_old.msg_perm.gid; | |
345 | out->msg_perm.mode = tbuf_old.msg_perm.mode; | |
346 | ||
347 | if (tbuf_old.msg_qbytes == 0) | |
348 | out->msg_qbytes = tbuf_old.msg_lqbytes; | |
349 | else | |
350 | out->msg_qbytes = tbuf_old.msg_qbytes; | |
351 | ||
352 | return 0; | |
353 | } | |
354 | default: | |
355 | return -EINVAL; | |
356 | } | |
357 | } | |
358 | ||
359 | /* | |
360 | * This function handles some msgctl commands which require the rwsem | |
361 | * to be held in write mode. | |
362 | * NOTE: no locks must be held, the rwsem is taken inside this function. | |
363 | */ | |
364 | static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd, | |
365 | struct msqid64_ds *msqid64) | |
366 | { | |
367 | struct kern_ipc_perm *ipcp; | |
368 | struct msg_queue *msq; | |
369 | int err; | |
370 | ||
371 | down_write(&msg_ids(ns).rwsem); | |
372 | rcu_read_lock(); | |
373 | ||
374 | ipcp = ipcctl_pre_down_nolock(ns, &msg_ids(ns), msqid, cmd, | |
375 | &msqid64->msg_perm, msqid64->msg_qbytes); | |
376 | if (IS_ERR(ipcp)) { | |
377 | err = PTR_ERR(ipcp); | |
378 | goto out_unlock1; | |
379 | } | |
380 | ||
381 | msq = container_of(ipcp, struct msg_queue, q_perm); | |
382 | ||
383 | err = security_msg_queue_msgctl(msq, cmd); | |
384 | if (err) | |
385 | goto out_unlock1; | |
386 | ||
387 | switch (cmd) { | |
388 | case IPC_RMID: | |
389 | ipc_lock_object(&msq->q_perm); | |
390 | /* freeque unlocks the ipc object and rcu */ | |
391 | freeque(ns, ipcp); | |
392 | goto out_up; | |
393 | case IPC_SET: | |
394 | { | |
395 | DEFINE_WAKE_Q(wake_q); | |
396 | ||
397 | if (msqid64->msg_qbytes > ns->msg_ctlmnb && | |
398 | !capable(CAP_SYS_RESOURCE)) { | |
399 | err = -EPERM; | |
400 | goto out_unlock1; | |
401 | } | |
402 | ||
403 | ipc_lock_object(&msq->q_perm); | |
404 | err = ipc_update_perm(&msqid64->msg_perm, ipcp); | |
405 | if (err) | |
406 | goto out_unlock0; | |
407 | ||
408 | msq->q_qbytes = msqid64->msg_qbytes; | |
409 | ||
410 | msq->q_ctime = ktime_get_real_seconds(); | |
411 | /* | |
412 | * Sleeping receivers might be excluded by | |
413 | * stricter permissions. | |
414 | */ | |
415 | expunge_all(msq, -EAGAIN, &wake_q); | |
416 | /* | |
417 | * Sleeping senders might be able to send | |
418 | * due to a larger queue size. | |
419 | */ | |
420 | ss_wakeup(msq, &wake_q, false); | |
421 | ipc_unlock_object(&msq->q_perm); | |
422 | wake_up_q(&wake_q); | |
423 | ||
424 | goto out_unlock1; | |
425 | } | |
426 | default: | |
427 | err = -EINVAL; | |
428 | goto out_unlock1; | |
429 | } | |
430 | ||
431 | out_unlock0: | |
432 | ipc_unlock_object(&msq->q_perm); | |
433 | out_unlock1: | |
434 | rcu_read_unlock(); | |
435 | out_up: | |
436 | up_write(&msg_ids(ns).rwsem); | |
437 | return err; | |
438 | } | |
439 | ||
440 | static int msgctl_info(struct ipc_namespace *ns, int msqid, | |
441 | int cmd, struct msginfo *msginfo) | |
442 | { | |
443 | int err; | |
444 | int max_id; | |
445 | ||
446 | /* | |
447 | * We must not return kernel stack data. | |
448 | * due to padding, it's not enough | |
449 | * to set all member fields. | |
450 | */ | |
451 | err = security_msg_queue_msgctl(NULL, cmd); | |
452 | if (err) | |
453 | return err; | |
454 | ||
455 | memset(msginfo, 0, sizeof(*msginfo)); | |
456 | msginfo->msgmni = ns->msg_ctlmni; | |
457 | msginfo->msgmax = ns->msg_ctlmax; | |
458 | msginfo->msgmnb = ns->msg_ctlmnb; | |
459 | msginfo->msgssz = MSGSSZ; | |
460 | msginfo->msgseg = MSGSEG; | |
461 | down_read(&msg_ids(ns).rwsem); | |
462 | if (cmd == MSG_INFO) { | |
463 | msginfo->msgpool = msg_ids(ns).in_use; | |
464 | msginfo->msgmap = atomic_read(&ns->msg_hdrs); | |
465 | msginfo->msgtql = atomic_read(&ns->msg_bytes); | |
466 | } else { | |
467 | msginfo->msgmap = MSGMAP; | |
468 | msginfo->msgpool = MSGPOOL; | |
469 | msginfo->msgtql = MSGTQL; | |
470 | } | |
471 | max_id = ipc_get_maxid(&msg_ids(ns)); | |
472 | up_read(&msg_ids(ns).rwsem); | |
473 | return (max_id < 0) ? 0 : max_id; | |
474 | } | |
475 | ||
476 | static int msgctl_stat(struct ipc_namespace *ns, int msqid, | |
477 | int cmd, struct msqid64_ds *p) | |
478 | { | |
479 | int err; | |
480 | struct msg_queue *msq; | |
481 | int success_return; | |
482 | ||
483 | memset(p, 0, sizeof(*p)); | |
484 | ||
485 | rcu_read_lock(); | |
486 | if (cmd == MSG_STAT) { | |
487 | msq = msq_obtain_object(ns, msqid); | |
488 | if (IS_ERR(msq)) { | |
489 | err = PTR_ERR(msq); | |
490 | goto out_unlock; | |
491 | } | |
492 | success_return = msq->q_perm.id; | |
493 | } else { | |
494 | msq = msq_obtain_object_check(ns, msqid); | |
495 | if (IS_ERR(msq)) { | |
496 | err = PTR_ERR(msq); | |
497 | goto out_unlock; | |
498 | } | |
499 | success_return = 0; | |
500 | } | |
501 | ||
502 | err = -EACCES; | |
503 | if (ipcperms(ns, &msq->q_perm, S_IRUGO)) | |
504 | goto out_unlock; | |
505 | ||
506 | err = security_msg_queue_msgctl(msq, cmd); | |
507 | if (err) | |
508 | goto out_unlock; | |
509 | ||
510 | kernel_to_ipc64_perm(&msq->q_perm, &p->msg_perm); | |
511 | p->msg_stime = msq->q_stime; | |
512 | p->msg_rtime = msq->q_rtime; | |
513 | p->msg_ctime = msq->q_ctime; | |
514 | p->msg_cbytes = msq->q_cbytes; | |
515 | p->msg_qnum = msq->q_qnum; | |
516 | p->msg_qbytes = msq->q_qbytes; | |
517 | p->msg_lspid = msq->q_lspid; | |
518 | p->msg_lrpid = msq->q_lrpid; | |
519 | rcu_read_unlock(); | |
520 | ||
521 | return success_return; | |
522 | ||
523 | out_unlock: | |
524 | rcu_read_unlock(); | |
525 | return err; | |
526 | } | |
527 | ||
528 | SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, struct msqid_ds __user *, buf) | |
529 | { | |
530 | int version; | |
531 | struct ipc_namespace *ns; | |
532 | struct msqid64_ds msqid64; | |
533 | int err; | |
534 | ||
535 | if (msqid < 0 || cmd < 0) | |
536 | return -EINVAL; | |
537 | ||
538 | version = ipc_parse_version(&cmd); | |
539 | ns = current->nsproxy->ipc_ns; | |
540 | ||
541 | switch (cmd) { | |
542 | case IPC_INFO: | |
543 | case MSG_INFO: { | |
544 | struct msginfo msginfo; | |
545 | err = msgctl_info(ns, msqid, cmd, &msginfo); | |
546 | if (err < 0) | |
547 | return err; | |
548 | if (copy_to_user(buf, &msginfo, sizeof(struct msginfo))) | |
549 | err = -EFAULT; | |
550 | return err; | |
551 | } | |
552 | case MSG_STAT: /* msqid is an index rather than a msg queue id */ | |
553 | case IPC_STAT: | |
554 | err = msgctl_stat(ns, msqid, cmd, &msqid64); | |
555 | if (err < 0) | |
556 | return err; | |
557 | if (copy_msqid_to_user(buf, &msqid64, version)) | |
558 | err = -EFAULT; | |
559 | return err; | |
560 | case IPC_SET: | |
561 | if (copy_msqid_from_user(&msqid64, buf, version)) | |
562 | return -EFAULT; | |
563 | /* fallthru */ | |
564 | case IPC_RMID: | |
565 | return msgctl_down(ns, msqid, cmd, &msqid64); | |
566 | default: | |
567 | return -EINVAL; | |
568 | } | |
569 | } | |
570 | ||
571 | #ifdef CONFIG_COMPAT | |
572 | ||
573 | struct compat_msqid_ds { | |
574 | struct compat_ipc_perm msg_perm; | |
575 | compat_uptr_t msg_first; | |
576 | compat_uptr_t msg_last; | |
577 | compat_time_t msg_stime; | |
578 | compat_time_t msg_rtime; | |
579 | compat_time_t msg_ctime; | |
580 | compat_ulong_t msg_lcbytes; | |
581 | compat_ulong_t msg_lqbytes; | |
582 | unsigned short msg_cbytes; | |
583 | unsigned short msg_qnum; | |
584 | unsigned short msg_qbytes; | |
585 | compat_ipc_pid_t msg_lspid; | |
586 | compat_ipc_pid_t msg_lrpid; | |
587 | }; | |
588 | ||
589 | static int copy_compat_msqid_from_user(struct msqid64_ds *out, void __user *buf, | |
590 | int version) | |
591 | { | |
592 | memset(out, 0, sizeof(*out)); | |
593 | if (version == IPC_64) { | |
594 | struct compat_msqid64_ds *p = buf; | |
595 | if (get_compat_ipc64_perm(&out->msg_perm, &p->msg_perm)) | |
596 | return -EFAULT; | |
597 | if (get_user(out->msg_qbytes, &p->msg_qbytes)) | |
598 | return -EFAULT; | |
599 | } else { | |
600 | struct compat_msqid_ds *p = buf; | |
601 | if (get_compat_ipc_perm(&out->msg_perm, &p->msg_perm)) | |
602 | return -EFAULT; | |
603 | if (get_user(out->msg_qbytes, &p->msg_qbytes)) | |
604 | return -EFAULT; | |
605 | } | |
606 | return 0; | |
607 | } | |
608 | ||
609 | static int copy_compat_msqid_to_user(void __user *buf, struct msqid64_ds *in, | |
610 | int version) | |
611 | { | |
612 | if (version == IPC_64) { | |
613 | struct compat_msqid64_ds v; | |
614 | memset(&v, 0, sizeof(v)); | |
615 | to_compat_ipc64_perm(&v.msg_perm, &in->msg_perm); | |
616 | v.msg_stime = in->msg_stime; | |
617 | v.msg_rtime = in->msg_rtime; | |
618 | v.msg_ctime = in->msg_ctime; | |
619 | v.msg_cbytes = in->msg_cbytes; | |
620 | v.msg_qnum = in->msg_qnum; | |
621 | v.msg_qbytes = in->msg_qbytes; | |
622 | v.msg_lspid = in->msg_lspid; | |
623 | v.msg_lrpid = in->msg_lrpid; | |
624 | return copy_to_user(buf, &v, sizeof(v)); | |
625 | } else { | |
626 | struct compat_msqid_ds v; | |
627 | memset(&v, 0, sizeof(v)); | |
628 | to_compat_ipc_perm(&v.msg_perm, &in->msg_perm); | |
629 | v.msg_stime = in->msg_stime; | |
630 | v.msg_rtime = in->msg_rtime; | |
631 | v.msg_ctime = in->msg_ctime; | |
632 | v.msg_cbytes = in->msg_cbytes; | |
633 | v.msg_qnum = in->msg_qnum; | |
634 | v.msg_qbytes = in->msg_qbytes; | |
635 | v.msg_lspid = in->msg_lspid; | |
636 | v.msg_lrpid = in->msg_lrpid; | |
637 | return copy_to_user(buf, &v, sizeof(v)); | |
638 | } | |
639 | } | |
640 | ||
641 | COMPAT_SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, void __user *, uptr) | |
642 | { | |
643 | struct ipc_namespace *ns; | |
644 | int err; | |
645 | struct msqid64_ds msqid64; | |
646 | int version = compat_ipc_parse_version(&cmd); | |
647 | ||
648 | ns = current->nsproxy->ipc_ns; | |
649 | ||
650 | if (msqid < 0 || cmd < 0) | |
651 | return -EINVAL; | |
652 | ||
653 | switch (cmd & (~IPC_64)) { | |
654 | case IPC_INFO: | |
655 | case MSG_INFO: { | |
656 | struct msginfo msginfo; | |
657 | err = msgctl_info(ns, msqid, cmd, &msginfo); | |
658 | if (err < 0) | |
659 | return err; | |
660 | if (copy_to_user(uptr, &msginfo, sizeof(struct msginfo))) | |
661 | err = -EFAULT; | |
662 | return err; | |
663 | } | |
664 | case IPC_STAT: | |
665 | case MSG_STAT: | |
666 | err = msgctl_stat(ns, msqid, cmd, &msqid64); | |
667 | if (err < 0) | |
668 | return err; | |
669 | if (copy_compat_msqid_to_user(uptr, &msqid64, version)) | |
670 | err = -EFAULT; | |
671 | return err; | |
672 | case IPC_SET: | |
673 | if (copy_compat_msqid_from_user(&msqid64, uptr, version)) | |
674 | return -EFAULT; | |
675 | /* fallthru */ | |
676 | case IPC_RMID: | |
677 | return msgctl_down(ns, msqid, cmd, &msqid64); | |
678 | default: | |
679 | return -EINVAL; | |
680 | } | |
681 | } | |
682 | #endif | |
683 | ||
684 | static int testmsg(struct msg_msg *msg, long type, int mode) | |
685 | { | |
686 | switch (mode) { | |
687 | case SEARCH_ANY: | |
688 | case SEARCH_NUMBER: | |
689 | return 1; | |
690 | case SEARCH_LESSEQUAL: | |
691 | if (msg->m_type <= type) | |
692 | return 1; | |
693 | break; | |
694 | case SEARCH_EQUAL: | |
695 | if (msg->m_type == type) | |
696 | return 1; | |
697 | break; | |
698 | case SEARCH_NOTEQUAL: | |
699 | if (msg->m_type != type) | |
700 | return 1; | |
701 | break; | |
702 | } | |
703 | return 0; | |
704 | } | |
705 | ||
706 | static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg, | |
707 | struct wake_q_head *wake_q) | |
708 | { | |
709 | struct msg_receiver *msr, *t; | |
710 | ||
711 | list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) { | |
712 | if (testmsg(msg, msr->r_msgtype, msr->r_mode) && | |
713 | !security_msg_queue_msgrcv(msq, msg, msr->r_tsk, | |
714 | msr->r_msgtype, msr->r_mode)) { | |
715 | ||
716 | list_del(&msr->r_list); | |
717 | if (msr->r_maxsize < msg->m_ts) { | |
718 | wake_q_add(wake_q, msr->r_tsk); | |
719 | WRITE_ONCE(msr->r_msg, ERR_PTR(-E2BIG)); | |
720 | } else { | |
721 | msq->q_lrpid = task_pid_vnr(msr->r_tsk); | |
722 | msq->q_rtime = get_seconds(); | |
723 | ||
724 | wake_q_add(wake_q, msr->r_tsk); | |
725 | WRITE_ONCE(msr->r_msg, msg); | |
726 | return 1; | |
727 | } | |
728 | } | |
729 | } | |
730 | ||
731 | return 0; | |
732 | } | |
733 | ||
734 | static long do_msgsnd(int msqid, long mtype, void __user *mtext, | |
735 | size_t msgsz, int msgflg) | |
736 | { | |
737 | struct msg_queue *msq; | |
738 | struct msg_msg *msg; | |
739 | int err; | |
740 | struct ipc_namespace *ns; | |
741 | DEFINE_WAKE_Q(wake_q); | |
742 | ||
743 | ns = current->nsproxy->ipc_ns; | |
744 | ||
745 | if (msgsz > ns->msg_ctlmax || (long) msgsz < 0 || msqid < 0) | |
746 | return -EINVAL; | |
747 | if (mtype < 1) | |
748 | return -EINVAL; | |
749 | ||
750 | msg = load_msg(mtext, msgsz); | |
751 | if (IS_ERR(msg)) | |
752 | return PTR_ERR(msg); | |
753 | ||
754 | msg->m_type = mtype; | |
755 | msg->m_ts = msgsz; | |
756 | ||
757 | rcu_read_lock(); | |
758 | msq = msq_obtain_object_check(ns, msqid); | |
759 | if (IS_ERR(msq)) { | |
760 | err = PTR_ERR(msq); | |
761 | goto out_unlock1; | |
762 | } | |
763 | ||
764 | ipc_lock_object(&msq->q_perm); | |
765 | ||
766 | for (;;) { | |
767 | struct msg_sender s; | |
768 | ||
769 | err = -EACCES; | |
770 | if (ipcperms(ns, &msq->q_perm, S_IWUGO)) | |
771 | goto out_unlock0; | |
772 | ||
773 | /* raced with RMID? */ | |
774 | if (!ipc_valid_object(&msq->q_perm)) { | |
775 | err = -EIDRM; | |
776 | goto out_unlock0; | |
777 | } | |
778 | ||
779 | err = security_msg_queue_msgsnd(msq, msg, msgflg); | |
780 | if (err) | |
781 | goto out_unlock0; | |
782 | ||
783 | if (msg_fits_inqueue(msq, msgsz)) | |
784 | break; | |
785 | ||
786 | /* queue full, wait: */ | |
787 | if (msgflg & IPC_NOWAIT) { | |
788 | err = -EAGAIN; | |
789 | goto out_unlock0; | |
790 | } | |
791 | ||
792 | /* enqueue the sender and prepare to block */ | |
793 | ss_add(msq, &s, msgsz); | |
794 | ||
795 | if (!ipc_rcu_getref(&msq->q_perm)) { | |
796 | err = -EIDRM; | |
797 | goto out_unlock0; | |
798 | } | |
799 | ||
800 | ipc_unlock_object(&msq->q_perm); | |
801 | rcu_read_unlock(); | |
802 | schedule(); | |
803 | ||
804 | rcu_read_lock(); | |
805 | ipc_lock_object(&msq->q_perm); | |
806 | ||
807 | ipc_rcu_putref(&msq->q_perm, msg_rcu_free); | |
808 | /* raced with RMID? */ | |
809 | if (!ipc_valid_object(&msq->q_perm)) { | |
810 | err = -EIDRM; | |
811 | goto out_unlock0; | |
812 | } | |
813 | ss_del(&s); | |
814 | ||
815 | if (signal_pending(current)) { | |
816 | err = -ERESTARTNOHAND; | |
817 | goto out_unlock0; | |
818 | } | |
819 | ||
820 | } | |
821 | ||
822 | msq->q_lspid = task_tgid_vnr(current); | |
823 | msq->q_stime = get_seconds(); | |
824 | ||
825 | if (!pipelined_send(msq, msg, &wake_q)) { | |
826 | /* no one is waiting for this message, enqueue it */ | |
827 | list_add_tail(&msg->m_list, &msq->q_messages); | |
828 | msq->q_cbytes += msgsz; | |
829 | msq->q_qnum++; | |
830 | atomic_add(msgsz, &ns->msg_bytes); | |
831 | atomic_inc(&ns->msg_hdrs); | |
832 | } | |
833 | ||
834 | err = 0; | |
835 | msg = NULL; | |
836 | ||
837 | out_unlock0: | |
838 | ipc_unlock_object(&msq->q_perm); | |
839 | wake_up_q(&wake_q); | |
840 | out_unlock1: | |
841 | rcu_read_unlock(); | |
842 | if (msg != NULL) | |
843 | free_msg(msg); | |
844 | return err; | |
845 | } | |
846 | ||
847 | SYSCALL_DEFINE4(msgsnd, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz, | |
848 | int, msgflg) | |
849 | { | |
850 | long mtype; | |
851 | ||
852 | if (get_user(mtype, &msgp->mtype)) | |
853 | return -EFAULT; | |
854 | return do_msgsnd(msqid, mtype, msgp->mtext, msgsz, msgflg); | |
855 | } | |
856 | ||
857 | #ifdef CONFIG_COMPAT | |
858 | ||
859 | struct compat_msgbuf { | |
860 | compat_long_t mtype; | |
861 | char mtext[1]; | |
862 | }; | |
863 | ||
864 | COMPAT_SYSCALL_DEFINE4(msgsnd, int, msqid, compat_uptr_t, msgp, | |
865 | compat_ssize_t, msgsz, int, msgflg) | |
866 | { | |
867 | struct compat_msgbuf __user *up = compat_ptr(msgp); | |
868 | compat_long_t mtype; | |
869 | ||
870 | if (get_user(mtype, &up->mtype)) | |
871 | return -EFAULT; | |
872 | return do_msgsnd(msqid, mtype, up->mtext, (ssize_t)msgsz, msgflg); | |
873 | } | |
874 | #endif | |
875 | ||
876 | static inline int convert_mode(long *msgtyp, int msgflg) | |
877 | { | |
878 | if (msgflg & MSG_COPY) | |
879 | return SEARCH_NUMBER; | |
880 | /* | |
881 | * find message of correct type. | |
882 | * msgtyp = 0 => get first. | |
883 | * msgtyp > 0 => get first message of matching type. | |
884 | * msgtyp < 0 => get message with least type must be < abs(msgtype). | |
885 | */ | |
886 | if (*msgtyp == 0) | |
887 | return SEARCH_ANY; | |
888 | if (*msgtyp < 0) { | |
889 | if (*msgtyp == LONG_MIN) /* -LONG_MIN is undefined */ | |
890 | *msgtyp = LONG_MAX; | |
891 | else | |
892 | *msgtyp = -*msgtyp; | |
893 | return SEARCH_LESSEQUAL; | |
894 | } | |
895 | if (msgflg & MSG_EXCEPT) | |
896 | return SEARCH_NOTEQUAL; | |
897 | return SEARCH_EQUAL; | |
898 | } | |
899 | ||
900 | static long do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz) | |
901 | { | |
902 | struct msgbuf __user *msgp = dest; | |
903 | size_t msgsz; | |
904 | ||
905 | if (put_user(msg->m_type, &msgp->mtype)) | |
906 | return -EFAULT; | |
907 | ||
908 | msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz; | |
909 | if (store_msg(msgp->mtext, msg, msgsz)) | |
910 | return -EFAULT; | |
911 | return msgsz; | |
912 | } | |
913 | ||
914 | #ifdef CONFIG_CHECKPOINT_RESTORE | |
915 | /* | |
916 | * This function creates new kernel message structure, large enough to store | |
917 | * bufsz message bytes. | |
918 | */ | |
919 | static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz) | |
920 | { | |
921 | struct msg_msg *copy; | |
922 | ||
923 | /* | |
924 | * Create dummy message to copy real message to. | |
925 | */ | |
926 | copy = load_msg(buf, bufsz); | |
927 | if (!IS_ERR(copy)) | |
928 | copy->m_ts = bufsz; | |
929 | return copy; | |
930 | } | |
931 | ||
932 | static inline void free_copy(struct msg_msg *copy) | |
933 | { | |
934 | if (copy) | |
935 | free_msg(copy); | |
936 | } | |
937 | #else | |
938 | static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz) | |
939 | { | |
940 | return ERR_PTR(-ENOSYS); | |
941 | } | |
942 | ||
943 | static inline void free_copy(struct msg_msg *copy) | |
944 | { | |
945 | } | |
946 | #endif | |
947 | ||
948 | static struct msg_msg *find_msg(struct msg_queue *msq, long *msgtyp, int mode) | |
949 | { | |
950 | struct msg_msg *msg, *found = NULL; | |
951 | long count = 0; | |
952 | ||
953 | list_for_each_entry(msg, &msq->q_messages, m_list) { | |
954 | if (testmsg(msg, *msgtyp, mode) && | |
955 | !security_msg_queue_msgrcv(msq, msg, current, | |
956 | *msgtyp, mode)) { | |
957 | if (mode == SEARCH_LESSEQUAL && msg->m_type != 1) { | |
958 | *msgtyp = msg->m_type - 1; | |
959 | found = msg; | |
960 | } else if (mode == SEARCH_NUMBER) { | |
961 | if (*msgtyp == count) | |
962 | return msg; | |
963 | } else | |
964 | return msg; | |
965 | count++; | |
966 | } | |
967 | } | |
968 | ||
969 | return found ?: ERR_PTR(-EAGAIN); | |
970 | } | |
971 | ||
972 | static long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, int msgflg, | |
973 | long (*msg_handler)(void __user *, struct msg_msg *, size_t)) | |
974 | { | |
975 | int mode; | |
976 | struct msg_queue *msq; | |
977 | struct ipc_namespace *ns; | |
978 | struct msg_msg *msg, *copy = NULL; | |
979 | DEFINE_WAKE_Q(wake_q); | |
980 | ||
981 | ns = current->nsproxy->ipc_ns; | |
982 | ||
983 | if (msqid < 0 || (long) bufsz < 0) | |
984 | return -EINVAL; | |
985 | ||
986 | if (msgflg & MSG_COPY) { | |
987 | if ((msgflg & MSG_EXCEPT) || !(msgflg & IPC_NOWAIT)) | |
988 | return -EINVAL; | |
989 | copy = prepare_copy(buf, min_t(size_t, bufsz, ns->msg_ctlmax)); | |
990 | if (IS_ERR(copy)) | |
991 | return PTR_ERR(copy); | |
992 | } | |
993 | mode = convert_mode(&msgtyp, msgflg); | |
994 | ||
995 | rcu_read_lock(); | |
996 | msq = msq_obtain_object_check(ns, msqid); | |
997 | if (IS_ERR(msq)) { | |
998 | rcu_read_unlock(); | |
999 | free_copy(copy); | |
1000 | return PTR_ERR(msq); | |
1001 | } | |
1002 | ||
1003 | for (;;) { | |
1004 | struct msg_receiver msr_d; | |
1005 | ||
1006 | msg = ERR_PTR(-EACCES); | |
1007 | if (ipcperms(ns, &msq->q_perm, S_IRUGO)) | |
1008 | goto out_unlock1; | |
1009 | ||
1010 | ipc_lock_object(&msq->q_perm); | |
1011 | ||
1012 | /* raced with RMID? */ | |
1013 | if (!ipc_valid_object(&msq->q_perm)) { | |
1014 | msg = ERR_PTR(-EIDRM); | |
1015 | goto out_unlock0; | |
1016 | } | |
1017 | ||
1018 | msg = find_msg(msq, &msgtyp, mode); | |
1019 | if (!IS_ERR(msg)) { | |
1020 | /* | |
1021 | * Found a suitable message. | |
1022 | * Unlink it from the queue. | |
1023 | */ | |
1024 | if ((bufsz < msg->m_ts) && !(msgflg & MSG_NOERROR)) { | |
1025 | msg = ERR_PTR(-E2BIG); | |
1026 | goto out_unlock0; | |
1027 | } | |
1028 | /* | |
1029 | * If we are copying, then do not unlink message and do | |
1030 | * not update queue parameters. | |
1031 | */ | |
1032 | if (msgflg & MSG_COPY) { | |
1033 | msg = copy_msg(msg, copy); | |
1034 | goto out_unlock0; | |
1035 | } | |
1036 | ||
1037 | list_del(&msg->m_list); | |
1038 | msq->q_qnum--; | |
1039 | msq->q_rtime = get_seconds(); | |
1040 | msq->q_lrpid = task_tgid_vnr(current); | |
1041 | msq->q_cbytes -= msg->m_ts; | |
1042 | atomic_sub(msg->m_ts, &ns->msg_bytes); | |
1043 | atomic_dec(&ns->msg_hdrs); | |
1044 | ss_wakeup(msq, &wake_q, false); | |
1045 | ||
1046 | goto out_unlock0; | |
1047 | } | |
1048 | ||
1049 | /* No message waiting. Wait for a message */ | |
1050 | if (msgflg & IPC_NOWAIT) { | |
1051 | msg = ERR_PTR(-ENOMSG); | |
1052 | goto out_unlock0; | |
1053 | } | |
1054 | ||
1055 | list_add_tail(&msr_d.r_list, &msq->q_receivers); | |
1056 | msr_d.r_tsk = current; | |
1057 | msr_d.r_msgtype = msgtyp; | |
1058 | msr_d.r_mode = mode; | |
1059 | if (msgflg & MSG_NOERROR) | |
1060 | msr_d.r_maxsize = INT_MAX; | |
1061 | else | |
1062 | msr_d.r_maxsize = bufsz; | |
1063 | msr_d.r_msg = ERR_PTR(-EAGAIN); | |
1064 | __set_current_state(TASK_INTERRUPTIBLE); | |
1065 | ||
1066 | ipc_unlock_object(&msq->q_perm); | |
1067 | rcu_read_unlock(); | |
1068 | schedule(); | |
1069 | ||
1070 | /* | |
1071 | * Lockless receive, part 1: | |
1072 | * We don't hold a reference to the queue and getting a | |
1073 | * reference would defeat the idea of a lockless operation, | |
1074 | * thus the code relies on rcu to guarantee the existence of | |
1075 | * msq: | |
1076 | * Prior to destruction, expunge_all(-EIRDM) changes r_msg. | |
1077 | * Thus if r_msg is -EAGAIN, then the queue not yet destroyed. | |
1078 | */ | |
1079 | rcu_read_lock(); | |
1080 | ||
1081 | /* | |
1082 | * Lockless receive, part 2: | |
1083 | * The work in pipelined_send() and expunge_all(): | |
1084 | * - Set pointer to message | |
1085 | * - Queue the receiver task for later wakeup | |
1086 | * - Wake up the process after the lock is dropped. | |
1087 | * | |
1088 | * Should the process wake up before this wakeup (due to a | |
1089 | * signal) it will either see the message and continue ... | |
1090 | */ | |
1091 | msg = READ_ONCE(msr_d.r_msg); | |
1092 | if (msg != ERR_PTR(-EAGAIN)) | |
1093 | goto out_unlock1; | |
1094 | ||
1095 | /* | |
1096 | * ... or see -EAGAIN, acquire the lock to check the message | |
1097 | * again. | |
1098 | */ | |
1099 | ipc_lock_object(&msq->q_perm); | |
1100 | ||
1101 | msg = msr_d.r_msg; | |
1102 | if (msg != ERR_PTR(-EAGAIN)) | |
1103 | goto out_unlock0; | |
1104 | ||
1105 | list_del(&msr_d.r_list); | |
1106 | if (signal_pending(current)) { | |
1107 | msg = ERR_PTR(-ERESTARTNOHAND); | |
1108 | goto out_unlock0; | |
1109 | } | |
1110 | ||
1111 | ipc_unlock_object(&msq->q_perm); | |
1112 | } | |
1113 | ||
1114 | out_unlock0: | |
1115 | ipc_unlock_object(&msq->q_perm); | |
1116 | wake_up_q(&wake_q); | |
1117 | out_unlock1: | |
1118 | rcu_read_unlock(); | |
1119 | if (IS_ERR(msg)) { | |
1120 | free_copy(copy); | |
1121 | return PTR_ERR(msg); | |
1122 | } | |
1123 | ||
1124 | bufsz = msg_handler(buf, msg, bufsz); | |
1125 | free_msg(msg); | |
1126 | ||
1127 | return bufsz; | |
1128 | } | |
1129 | ||
1130 | SYSCALL_DEFINE5(msgrcv, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz, | |
1131 | long, msgtyp, int, msgflg) | |
1132 | { | |
1133 | return do_msgrcv(msqid, msgp, msgsz, msgtyp, msgflg, do_msg_fill); | |
1134 | } | |
1135 | ||
1136 | #ifdef CONFIG_COMPAT | |
1137 | static long compat_do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz) | |
1138 | { | |
1139 | struct compat_msgbuf __user *msgp = dest; | |
1140 | size_t msgsz; | |
1141 | ||
1142 | if (put_user(msg->m_type, &msgp->mtype)) | |
1143 | return -EFAULT; | |
1144 | ||
1145 | msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz; | |
1146 | if (store_msg(msgp->mtext, msg, msgsz)) | |
1147 | return -EFAULT; | |
1148 | return msgsz; | |
1149 | } | |
1150 | ||
1151 | COMPAT_SYSCALL_DEFINE5(msgrcv, int, msqid, compat_uptr_t, msgp, | |
1152 | compat_ssize_t, msgsz, compat_long_t, msgtyp, int, msgflg) | |
1153 | { | |
1154 | return do_msgrcv(msqid, compat_ptr(msgp), (ssize_t)msgsz, (long)msgtyp, | |
1155 | msgflg, compat_do_msg_fill); | |
1156 | } | |
1157 | #endif | |
1158 | ||
1159 | int msg_init_ns(struct ipc_namespace *ns) | |
1160 | { | |
1161 | ns->msg_ctlmax = MSGMAX; | |
1162 | ns->msg_ctlmnb = MSGMNB; | |
1163 | ns->msg_ctlmni = MSGMNI; | |
1164 | ||
1165 | atomic_set(&ns->msg_bytes, 0); | |
1166 | atomic_set(&ns->msg_hdrs, 0); | |
1167 | return ipc_init_ids(&ns->ids[IPC_MSG_IDS]); | |
1168 | } | |
1169 | ||
1170 | #ifdef CONFIG_IPC_NS | |
1171 | void msg_exit_ns(struct ipc_namespace *ns) | |
1172 | { | |
1173 | free_ipcs(ns, &msg_ids(ns), freeque); | |
1174 | idr_destroy(&ns->ids[IPC_MSG_IDS].ipcs_idr); | |
1175 | rhashtable_destroy(&ns->ids[IPC_MSG_IDS].key_ht); | |
1176 | } | |
1177 | #endif | |
1178 | ||
1179 | #ifdef CONFIG_PROC_FS | |
1180 | static int sysvipc_msg_proc_show(struct seq_file *s, void *it) | |
1181 | { | |
1182 | struct user_namespace *user_ns = seq_user_ns(s); | |
1183 | struct kern_ipc_perm *ipcp = it; | |
1184 | struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm); | |
1185 | ||
1186 | seq_printf(s, | |
1187 | "%10d %10d %4o %10lu %10lu %5u %5u %5u %5u %5u %5u %10llu %10llu %10llu\n", | |
1188 | msq->q_perm.key, | |
1189 | msq->q_perm.id, | |
1190 | msq->q_perm.mode, | |
1191 | msq->q_cbytes, | |
1192 | msq->q_qnum, | |
1193 | msq->q_lspid, | |
1194 | msq->q_lrpid, | |
1195 | from_kuid_munged(user_ns, msq->q_perm.uid), | |
1196 | from_kgid_munged(user_ns, msq->q_perm.gid), | |
1197 | from_kuid_munged(user_ns, msq->q_perm.cuid), | |
1198 | from_kgid_munged(user_ns, msq->q_perm.cgid), | |
1199 | msq->q_stime, | |
1200 | msq->q_rtime, | |
1201 | msq->q_ctime); | |
1202 | ||
1203 | return 0; | |
1204 | } | |
1205 | #endif | |
1206 | ||
1207 | int __init msg_init(void) | |
1208 | { | |
1209 | const int err = msg_init_ns(&init_ipc_ns); | |
1210 | ||
1211 | ipc_init_proc_interface("sysvipc/msg", | |
1212 | " key msqid perms cbytes qnum lspid lrpid uid gid cuid cgid stime rtime ctime\n", | |
1213 | IPC_MSG_IDS, sysvipc_msg_proc_show); | |
1214 | return err; | |
1215 | } |