1 /*-
2 * Implementation of SVID messages
3 *
4 * Author: Daniel Boulet
5 *
6 * Copyright 1993 Daniel Boulet and RTMX Inc.
7 *
8 * This system call was implemented by Daniel Boulet under contract from RTMX.
9 *
10 * Redistribution and use in source forms, with and without modification,
11 * are permitted provided that this entire comment appears intact.
12 *
13 * Redistribution in binary form may occur without any restrictions.
14 * Obviously, it would be nice if you gave credit where credit is due
15 * but requiring it would be too onerous.
16 *
17 * This software is provided ``AS IS'' without any warranties of any kind.
18 */
19 /*-
20 * Copyright (c) 2003-2005 McAfee, Inc.
21 * All rights reserved.
22 *
23 * This software was developed for the FreeBSD Project in part by McAfee
24 * Research, the Security Research Division of McAfee, Inc under DARPA/SPAWAR
25 * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS research
26 * program.
27 *
28 * Redistribution and use in source and binary forms, with or without
29 * modification, are permitted provided that the following conditions
30 * are met:
31 * 1. Redistributions of source code must retain the above copyright
32 * notice, this list of conditions and the following disclaimer.
33 * 2. Redistributions in binary form must reproduce the above copyright
34 * notice, this list of conditions and the following disclaimer in the
35 * documentation and/or other materials provided with the distribution.
36 *
37 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
38 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
39 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
40 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
41 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
42 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
43 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
45 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
46 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
47 * SUCH DAMAGE.
48 */
49
50 #include <sys/cdefs.h>
51 __FBSDID("$FreeBSD: stable/10/sys/kern/sysv_msg.c 329741 2018-02-21 18:32:57Z brooks $");
52
53 #include "opt_compat.h"
54 #include "opt_sysvipc.h"
55
56 #include <sys/param.h>
57 #include <sys/systm.h>
58 #include <sys/sysproto.h>
59 #include <sys/kernel.h>
60 #include <sys/priv.h>
61 #include <sys/proc.h>
62 #include <sys/lock.h>
63 #include <sys/mutex.h>
64 #include <sys/module.h>
65 #include <sys/mount.h>
66 #include <sys/msg.h>
67 #include <sys/racct.h>
68 #include <sys/sx.h>
69 #include <sys/syscall.h>
70 #include <sys/syscallsubr.h>
71 #include <sys/sysent.h>
72 #include <sys/sysctl.h>
73 #include <sys/malloc.h>
74 #include <sys/jail.h>
75
76 #include <security/mac/mac_framework.h>
77
78 FEATURE(sysv_msg, "System V message queues support");
79
80 static MALLOC_DEFINE(M_MSG, "msg", "SVID compatible message queues");
81
82 static int msginit(void);
83 static int msgunload(void);
84 static int sysvmsg_modload(struct module *, int, void *);
85 static void msq_remove(struct msqid_kernel *);
86 static struct prison *msg_find_prison(struct ucred *);
87 static int msq_prison_cansee(struct prison *, struct msqid_kernel *);
88 static int msg_prison_check(void *, void *);
89 static int msg_prison_set(void *, void *);
90 static int msg_prison_get(void *, void *);
91 static int msg_prison_remove(void *, void *);
92 static void msg_prison_cleanup(struct prison *);
93
94
95 #ifdef MSG_DEBUG
96 #define DPRINTF(a) printf a
97 #else
98 #define DPRINTF(a) (void)0
99 #endif
100
101 static void msg_freehdr(struct msg *msghdr);
102
103 #ifndef MSGSSZ
104 #define MSGSSZ 8 /* Each segment must be 2^N long */
105 #endif
106 #ifndef MSGSEG
107 #define MSGSEG 2048 /* must be less than 32767 */
108 #endif
109 #define MSGMAX (MSGSSZ*MSGSEG)
110 #ifndef MSGMNB
111 #define MSGMNB 2048 /* max # of bytes in a queue */
112 #endif
113 #ifndef MSGMNI
114 #define MSGMNI 40
115 #endif
116 #ifndef MSGTQL
117 #define MSGTQL 40
118 #endif
119
120 /*
121 * Based on the configuration parameters described in an SVR2 (yes, two)
122 * config(1m) man page.
123 *
124 * Each message is broken up and stored in segments that are msgssz bytes
125 * long. For efficiency reasons, this should be a power of two. Also,
126 * it doesn't make sense if it is less than 8 or greater than about 256.
127 * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of
128 * two between 8 and 1024 inclusive (and panic's if it isn't).
129 */
130 struct msginfo msginfo = {
131 MSGMAX, /* max chars in a message */
132 MSGMNI, /* # of message queue identifiers */
133 MSGMNB, /* max chars in a queue */
134 MSGTQL, /* max messages in system */
135 MSGSSZ, /* size of a message segment */
136 /* (must be small power of 2 greater than 4) */
137 MSGSEG /* number of message segments */
138 };
139
140 /*
141 * macros to convert between msqid_ds's and msqid's.
142 * (specific to this implementation)
143 */
144 #define MSQID(ix,ds) ((ix) & 0xffff | (((ds).msg_perm.seq << 16) & 0xffff0000))
145 #define MSQID_IX(id) ((id) & 0xffff)
146 #define MSQID_SEQ(id) (((id) >> 16) & 0xffff)
147
148 /*
149 * The rest of this file is specific to this particular implementation.
150 */
151
152 struct msgmap {
153 short next; /* next segment in buffer */
154 /* -1 -> available */
155 /* 0..(MSGSEG-1) -> index of next segment */
156 };
157
158 #define MSG_LOCKED 01000 /* Is this msqid_ds locked? */
159
160 static int nfree_msgmaps; /* # of free map entries */
161 static short free_msgmaps; /* head of linked list of free map entries */
162 static struct msg *free_msghdrs;/* list of free msg headers */
163 static char *msgpool; /* MSGMAX byte long msg buffer pool */
164 static struct msgmap *msgmaps; /* MSGSEG msgmap structures */
165 static struct msg *msghdrs; /* MSGTQL msg headers */
166 static struct msqid_kernel *msqids; /* MSGMNI msqid_kernel struct's */
167 static struct mtx msq_mtx; /* global mutex for message queues. */
168 static unsigned msg_prison_slot;/* prison OSD slot */
169
170 static struct syscall_helper_data msg_syscalls[] = {
171 SYSCALL_INIT_HELPER(msgctl),
172 SYSCALL_INIT_HELPER(msgget),
173 SYSCALL_INIT_HELPER(msgsnd),
174 SYSCALL_INIT_HELPER(msgrcv),
175 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
176 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
177 SYSCALL_INIT_HELPER(msgsys),
178 SYSCALL_INIT_HELPER_COMPAT(freebsd7_msgctl),
179 #endif
180 SYSCALL_INIT_LAST
181 };
182
183 #ifdef COMPAT_FREEBSD32
184 #include <compat/freebsd32/freebsd32.h>
185 #include <compat/freebsd32/freebsd32_ipc.h>
186 #include <compat/freebsd32/freebsd32_proto.h>
187 #include <compat/freebsd32/freebsd32_signal.h>
188 #include <compat/freebsd32/freebsd32_syscall.h>
189 #include <compat/freebsd32/freebsd32_util.h>
190
191 static struct syscall_helper_data msg32_syscalls[] = {
192 SYSCALL32_INIT_HELPER(freebsd32_msgctl),
193 SYSCALL32_INIT_HELPER(freebsd32_msgsnd),
194 SYSCALL32_INIT_HELPER(freebsd32_msgrcv),
195 SYSCALL32_INIT_HELPER_COMPAT(msgget),
196 SYSCALL32_INIT_HELPER(freebsd32_msgsys),
197 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
198 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
199 SYSCALL32_INIT_HELPER(freebsd7_freebsd32_msgctl),
200 #endif
201 SYSCALL_INIT_LAST
202 };
203 #endif
204
205 static int
msginit()206 msginit()
207 {
208 struct prison *pr;
209 void *rsv;
210 int i, error;
211 osd_method_t methods[PR_MAXMETHOD] = {
212 [PR_METHOD_CHECK] = msg_prison_check,
213 [PR_METHOD_SET] = msg_prison_set,
214 [PR_METHOD_GET] = msg_prison_get,
215 [PR_METHOD_REMOVE] = msg_prison_remove,
216 };
217
218 TUNABLE_INT_FETCH("kern.ipc.msgseg", &msginfo.msgseg);
219 TUNABLE_INT_FETCH("kern.ipc.msgssz", &msginfo.msgssz);
220 msginfo.msgmax = msginfo.msgseg * msginfo.msgssz;
221 TUNABLE_INT_FETCH("kern.ipc.msgmni", &msginfo.msgmni);
222 TUNABLE_INT_FETCH("kern.ipc.msgmnb", &msginfo.msgmnb);
223 TUNABLE_INT_FETCH("kern.ipc.msgtql", &msginfo.msgtql);
224
225 msgpool = malloc(msginfo.msgmax, M_MSG, M_WAITOK);
226 msgmaps = malloc(sizeof(struct msgmap) * msginfo.msgseg, M_MSG, M_WAITOK);
227 msghdrs = malloc(sizeof(struct msg) * msginfo.msgtql, M_MSG, M_WAITOK);
228 msqids = malloc(sizeof(struct msqid_kernel) * msginfo.msgmni, M_MSG,
229 M_WAITOK);
230
231 /*
232 * msginfo.msgssz should be a power of two for efficiency reasons.
233 * It is also pretty silly if msginfo.msgssz is less than 8
234 * or greater than about 256 so ...
235 */
236
237 i = 8;
238 while (i < 1024 && i != msginfo.msgssz)
239 i <<= 1;
240 if (i != msginfo.msgssz) {
241 DPRINTF(("msginfo.msgssz=%d (0x%x)\n", msginfo.msgssz,
242 msginfo.msgssz));
243 panic("msginfo.msgssz not a small power of 2");
244 }
245
246 if (msginfo.msgseg > 32767) {
247 DPRINTF(("msginfo.msgseg=%d\n", msginfo.msgseg));
248 panic("msginfo.msgseg > 32767");
249 }
250
251 for (i = 0; i < msginfo.msgseg; i++) {
252 if (i > 0)
253 msgmaps[i-1].next = i;
254 msgmaps[i].next = -1; /* implies entry is available */
255 }
256 free_msgmaps = 0;
257 nfree_msgmaps = msginfo.msgseg;
258
259 for (i = 0; i < msginfo.msgtql; i++) {
260 msghdrs[i].msg_type = 0;
261 if (i > 0)
262 msghdrs[i-1].msg_next = &msghdrs[i];
263 msghdrs[i].msg_next = NULL;
264 #ifdef MAC
265 mac_sysvmsg_init(&msghdrs[i]);
266 #endif
267 }
268 free_msghdrs = &msghdrs[0];
269
270 for (i = 0; i < msginfo.msgmni; i++) {
271 msqids[i].u.msg_qbytes = 0; /* implies entry is available */
272 msqids[i].u.msg_perm.seq = 0; /* reset to a known value */
273 msqids[i].u.msg_perm.mode = 0;
274 #ifdef MAC
275 mac_sysvmsq_init(&msqids[i]);
276 #endif
277 }
278 mtx_init(&msq_mtx, "msq", NULL, MTX_DEF);
279
280 /* Set current prisons according to their allow.sysvipc. */
281 msg_prison_slot = osd_jail_register(NULL, methods);
282 rsv = osd_reserve(msg_prison_slot);
283 prison_lock(&prison0);
284 (void)osd_jail_set_reserved(&prison0, msg_prison_slot, rsv, &prison0);
285 prison_unlock(&prison0);
286 rsv = NULL;
287 sx_slock(&allprison_lock);
288 TAILQ_FOREACH(pr, &allprison, pr_list) {
289 if (rsv == NULL)
290 rsv = osd_reserve(msg_prison_slot);
291 prison_lock(pr);
292 if ((pr->pr_allow & PR_ALLOW_SYSVIPC) && pr->pr_ref > 0) {
293 (void)osd_jail_set_reserved(pr, msg_prison_slot, rsv,
294 &prison0);
295 rsv = NULL;
296 }
297 prison_unlock(pr);
298 }
299 if (rsv != NULL)
300 osd_free_reserved(rsv);
301 sx_sunlock(&allprison_lock);
302
303 error = syscall_helper_register(msg_syscalls);
304 if (error != 0)
305 return (error);
306 #ifdef COMPAT_FREEBSD32
307 error = syscall32_helper_register(msg32_syscalls);
308 if (error != 0)
309 return (error);
310 #endif
311 return (0);
312 }
313
314 static int
msgunload()315 msgunload()
316 {
317 struct msqid_kernel *msqkptr;
318 int msqid;
319 #ifdef MAC
320 int i;
321 #endif
322
323 syscall_helper_unregister(msg_syscalls);
324 #ifdef COMPAT_FREEBSD32
325 syscall32_helper_unregister(msg32_syscalls);
326 #endif
327
328 for (msqid = 0; msqid < msginfo.msgmni; msqid++) {
329 msqkptr = &msqids[msqid];
330 if (msqkptr->u.msg_qbytes != 0 ||
331 (msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0)
332 break;
333 }
334 if (msqid != msginfo.msgmni)
335 return (EBUSY);
336
337 if (msg_prison_slot != 0)
338 osd_jail_deregister(msg_prison_slot);
339 #ifdef MAC
340 for (i = 0; i < msginfo.msgtql; i++)
341 mac_sysvmsg_destroy(&msghdrs[i]);
342 for (msqid = 0; msqid < msginfo.msgmni; msqid++)
343 mac_sysvmsq_destroy(&msqids[msqid]);
344 #endif
345 free(msgpool, M_MSG);
346 free(msgmaps, M_MSG);
347 free(msghdrs, M_MSG);
348 free(msqids, M_MSG);
349 mtx_destroy(&msq_mtx);
350 return (0);
351 }
352
353
354 static int
sysvmsg_modload(struct module * module,int cmd,void * arg)355 sysvmsg_modload(struct module *module, int cmd, void *arg)
356 {
357 int error = 0;
358
359 switch (cmd) {
360 case MOD_LOAD:
361 error = msginit();
362 if (error != 0)
363 msgunload();
364 break;
365 case MOD_UNLOAD:
366 error = msgunload();
367 break;
368 case MOD_SHUTDOWN:
369 break;
370 default:
371 error = EINVAL;
372 break;
373 }
374 return (error);
375 }
376
377 static moduledata_t sysvmsg_mod = {
378 "sysvmsg",
379 &sysvmsg_modload,
380 NULL
381 };
382
383 DECLARE_MODULE(sysvmsg, sysvmsg_mod, SI_SUB_SYSV_MSG, SI_ORDER_FIRST);
384 MODULE_VERSION(sysvmsg, 1);
385
386 static void
msg_freehdr(msghdr)387 msg_freehdr(msghdr)
388 struct msg *msghdr;
389 {
390 while (msghdr->msg_ts > 0) {
391 short next;
392 if (msghdr->msg_spot < 0 || msghdr->msg_spot >= msginfo.msgseg)
393 panic("msghdr->msg_spot out of range");
394 next = msgmaps[msghdr->msg_spot].next;
395 msgmaps[msghdr->msg_spot].next = free_msgmaps;
396 free_msgmaps = msghdr->msg_spot;
397 nfree_msgmaps++;
398 msghdr->msg_spot = next;
399 if (msghdr->msg_ts >= msginfo.msgssz)
400 msghdr->msg_ts -= msginfo.msgssz;
401 else
402 msghdr->msg_ts = 0;
403 }
404 if (msghdr->msg_spot != -1)
405 panic("msghdr->msg_spot != -1");
406 msghdr->msg_next = free_msghdrs;
407 free_msghdrs = msghdr;
408 #ifdef MAC
409 mac_sysvmsg_cleanup(msghdr);
410 #endif
411 }
412
413 static void
msq_remove(struct msqid_kernel * msqkptr)414 msq_remove(struct msqid_kernel *msqkptr)
415 {
416 struct msg *msghdr;
417
418 racct_sub_cred(msqkptr->cred, RACCT_NMSGQ, 1);
419 racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, msqkptr->u.msg_qnum);
420 racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msqkptr->u.msg_cbytes);
421 crfree(msqkptr->cred);
422 msqkptr->cred = NULL;
423
424 /* Free the message headers */
425 msghdr = msqkptr->u.msg_first;
426 while (msghdr != NULL) {
427 struct msg *msghdr_tmp;
428
429 /* Free the segments of each message */
430 msqkptr->u.msg_cbytes -= msghdr->msg_ts;
431 msqkptr->u.msg_qnum--;
432 msghdr_tmp = msghdr;
433 msghdr = msghdr->msg_next;
434 msg_freehdr(msghdr_tmp);
435 }
436
437 if (msqkptr->u.msg_cbytes != 0)
438 panic("msg_cbytes is screwed up");
439 if (msqkptr->u.msg_qnum != 0)
440 panic("msg_qnum is screwed up");
441
442 msqkptr->u.msg_qbytes = 0; /* Mark it as free */
443
444 #ifdef MAC
445 mac_sysvmsq_cleanup(msqkptr);
446 #endif
447
448 wakeup(msqkptr);
449 }
450
451 static struct prison *
msg_find_prison(struct ucred * cred)452 msg_find_prison(struct ucred *cred)
453 {
454 struct prison *pr, *rpr;
455
456 pr = cred->cr_prison;
457 prison_lock(pr);
458 rpr = osd_jail_get(pr, msg_prison_slot);
459 prison_unlock(pr);
460 return rpr;
461 }
462
463 static int
msq_prison_cansee(struct prison * rpr,struct msqid_kernel * msqkptr)464 msq_prison_cansee(struct prison *rpr, struct msqid_kernel *msqkptr)
465 {
466
467 if (msqkptr->cred == NULL ||
468 !(rpr == msqkptr->cred->cr_prison ||
469 prison_ischild(rpr, msqkptr->cred->cr_prison)))
470 return (EINVAL);
471 return (0);
472 }
473
474 #ifndef _SYS_SYSPROTO_H_
475 struct msgctl_args {
476 int msqid;
477 int cmd;
478 struct msqid_ds *buf;
479 };
480 #endif
481 int
sys_msgctl(td,uap)482 sys_msgctl(td, uap)
483 struct thread *td;
484 register struct msgctl_args *uap;
485 {
486 int msqid = uap->msqid;
487 int cmd = uap->cmd;
488 struct msqid_ds msqbuf;
489 int error;
490
491 DPRINTF(("call to msgctl(%d, %d, %p)\n", msqid, cmd, uap->buf));
492 if (cmd == IPC_SET &&
493 (error = copyin(uap->buf, &msqbuf, sizeof(msqbuf))) != 0)
494 return (error);
495 error = kern_msgctl(td, msqid, cmd, &msqbuf);
496 if (cmd == IPC_STAT && error == 0)
497 error = copyout(&msqbuf, uap->buf, sizeof(struct msqid_ds));
498 return (error);
499 }
500
501 int
kern_msgctl(td,msqid,cmd,msqbuf)502 kern_msgctl(td, msqid, cmd, msqbuf)
503 struct thread *td;
504 int msqid;
505 int cmd;
506 struct msqid_ds *msqbuf;
507 {
508 int rval, error, msqix;
509 register struct msqid_kernel *msqkptr;
510 struct prison *rpr;
511
512 rpr = msg_find_prison(td->td_ucred);
513 if (rpr == NULL)
514 return (ENOSYS);
515
516 msqix = IPCID_TO_IX(msqid);
517
518 if (msqix < 0 || msqix >= msginfo.msgmni) {
519 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix,
520 msginfo.msgmni));
521 return (EINVAL);
522 }
523
524 msqkptr = &msqids[msqix];
525
526 mtx_lock(&msq_mtx);
527 if (msqkptr->u.msg_qbytes == 0) {
528 DPRINTF(("no such msqid\n"));
529 error = EINVAL;
530 goto done2;
531 }
532 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) {
533 DPRINTF(("wrong sequence number\n"));
534 error = EINVAL;
535 goto done2;
536 }
537
538 error = msq_prison_cansee(rpr, msqkptr);
539 if (error != 0) {
540 DPRINTF(("requester can't see prison\n"));
541 goto done2;
542 }
543
544 #ifdef MAC
545 error = mac_sysvmsq_check_msqctl(td->td_ucred, msqkptr, cmd);
546 if (error != 0)
547 goto done2;
548 #endif
549
550 error = 0;
551 rval = 0;
552
553 switch (cmd) {
554
555 case IPC_RMID:
556 {
557 #ifdef MAC
558 struct msg *msghdr;
559 #endif
560 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M)))
561 goto done2;
562
563 #ifdef MAC
564 /*
565 * Check that the thread has MAC access permissions to
566 * individual msghdrs. Note: We need to do this in a
567 * separate loop because the actual loop alters the
568 * msq/msghdr info as it progresses, and there is no going
569 * back if half the way through we discover that the
570 * thread cannot free a certain msghdr. The msq will get
571 * into an inconsistent state.
572 */
573 for (msghdr = msqkptr->u.msg_first; msghdr != NULL;
574 msghdr = msghdr->msg_next) {
575 error = mac_sysvmsq_check_msgrmid(td->td_ucred, msghdr);
576 if (error != 0)
577 goto done2;
578 }
579 #endif
580
581 msq_remove(msqkptr);
582 }
583
584 break;
585
586 case IPC_SET:
587 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M)))
588 goto done2;
589 if (msqbuf->msg_qbytes > msqkptr->u.msg_qbytes) {
590 error = priv_check(td, PRIV_IPC_MSGSIZE);
591 if (error)
592 goto done2;
593 }
594 if (msqbuf->msg_qbytes > msginfo.msgmnb) {
595 DPRINTF(("can't increase msg_qbytes beyond %d"
596 "(truncating)\n", msginfo.msgmnb));
597 msqbuf->msg_qbytes = msginfo.msgmnb; /* silently restrict qbytes to system limit */
598 }
599 if (msqbuf->msg_qbytes == 0) {
600 DPRINTF(("can't reduce msg_qbytes to 0\n"));
601 error = EINVAL; /* non-standard errno! */
602 goto done2;
603 }
604 msqkptr->u.msg_perm.uid = msqbuf->msg_perm.uid; /* change the owner */
605 msqkptr->u.msg_perm.gid = msqbuf->msg_perm.gid; /* change the owner */
606 msqkptr->u.msg_perm.mode = (msqkptr->u.msg_perm.mode & ~0777) |
607 (msqbuf->msg_perm.mode & 0777);
608 msqkptr->u.msg_qbytes = msqbuf->msg_qbytes;
609 msqkptr->u.msg_ctime = time_second;
610 break;
611
612 case IPC_STAT:
613 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) {
614 DPRINTF(("requester doesn't have read access\n"));
615 goto done2;
616 }
617 *msqbuf = msqkptr->u;
618 if (td->td_ucred->cr_prison != msqkptr->cred->cr_prison)
619 msqbuf->msg_perm.key = IPC_PRIVATE;
620 break;
621
622 default:
623 DPRINTF(("invalid command %d\n", cmd));
624 error = EINVAL;
625 goto done2;
626 }
627
628 if (error == 0)
629 td->td_retval[0] = rval;
630 done2:
631 mtx_unlock(&msq_mtx);
632 return (error);
633 }
634
635 #ifndef _SYS_SYSPROTO_H_
636 struct msgget_args {
637 key_t key;
638 int msgflg;
639 };
640 #endif
641
642 int
sys_msgget(td,uap)643 sys_msgget(td, uap)
644 struct thread *td;
645 register struct msgget_args *uap;
646 {
647 int msqid, error = 0;
648 int key = uap->key;
649 int msgflg = uap->msgflg;
650 struct ucred *cred = td->td_ucred;
651 register struct msqid_kernel *msqkptr = NULL;
652
653 DPRINTF(("msgget(0x%x, 0%o)\n", key, msgflg));
654
655 if (msg_find_prison(cred) == NULL)
656 return (ENOSYS);
657
658 mtx_lock(&msq_mtx);
659 if (key != IPC_PRIVATE) {
660 for (msqid = 0; msqid < msginfo.msgmni; msqid++) {
661 msqkptr = &msqids[msqid];
662 if (msqkptr->u.msg_qbytes != 0 &&
663 msqkptr->cred != NULL &&
664 msqkptr->cred->cr_prison == cred->cr_prison &&
665 msqkptr->u.msg_perm.key == key)
666 break;
667 }
668 if (msqid < msginfo.msgmni) {
669 DPRINTF(("found public key\n"));
670 if ((msgflg & IPC_CREAT) && (msgflg & IPC_EXCL)) {
671 DPRINTF(("not exclusive\n"));
672 error = EEXIST;
673 goto done2;
674 }
675 if ((error = ipcperm(td, &msqkptr->u.msg_perm,
676 msgflg & 0700))) {
677 DPRINTF(("requester doesn't have 0%o access\n",
678 msgflg & 0700));
679 goto done2;
680 }
681 #ifdef MAC
682 error = mac_sysvmsq_check_msqget(cred, msqkptr);
683 if (error != 0)
684 goto done2;
685 #endif
686 goto found;
687 }
688 }
689
690 DPRINTF(("need to allocate the msqid_ds\n"));
691 if (key == IPC_PRIVATE || (msgflg & IPC_CREAT)) {
692 for (msqid = 0; msqid < msginfo.msgmni; msqid++) {
693 /*
694 * Look for an unallocated and unlocked msqid_ds.
695 * msqid_ds's can be locked by msgsnd or msgrcv while
696 * they are copying the message in/out. We can't
697 * re-use the entry until they release it.
698 */
699 msqkptr = &msqids[msqid];
700 if (msqkptr->u.msg_qbytes == 0 &&
701 (msqkptr->u.msg_perm.mode & MSG_LOCKED) == 0)
702 break;
703 }
704 if (msqid == msginfo.msgmni) {
705 DPRINTF(("no more msqid_ds's available\n"));
706 error = ENOSPC;
707 goto done2;
708 }
709 #ifdef RACCT
710 if (racct_enable) {
711 PROC_LOCK(td->td_proc);
712 error = racct_add(td->td_proc, RACCT_NMSGQ, 1);
713 PROC_UNLOCK(td->td_proc);
714 if (error != 0) {
715 error = ENOSPC;
716 goto done2;
717 }
718 }
719 #endif
720 DPRINTF(("msqid %d is available\n", msqid));
721 msqkptr->u.msg_perm.key = key;
722 msqkptr->u.msg_perm.cuid = cred->cr_uid;
723 msqkptr->u.msg_perm.uid = cred->cr_uid;
724 msqkptr->u.msg_perm.cgid = cred->cr_gid;
725 msqkptr->u.msg_perm.gid = cred->cr_gid;
726 msqkptr->u.msg_perm.mode = (msgflg & 0777);
727 msqkptr->cred = crhold(cred);
728 /* Make sure that the returned msqid is unique */
729 msqkptr->u.msg_perm.seq = (msqkptr->u.msg_perm.seq + 1) & 0x7fff;
730 msqkptr->u.msg_first = NULL;
731 msqkptr->u.msg_last = NULL;
732 msqkptr->u.msg_cbytes = 0;
733 msqkptr->u.msg_qnum = 0;
734 msqkptr->u.msg_qbytes = msginfo.msgmnb;
735 msqkptr->u.msg_lspid = 0;
736 msqkptr->u.msg_lrpid = 0;
737 msqkptr->u.msg_stime = 0;
738 msqkptr->u.msg_rtime = 0;
739 msqkptr->u.msg_ctime = time_second;
740 #ifdef MAC
741 mac_sysvmsq_create(cred, msqkptr);
742 #endif
743 } else {
744 DPRINTF(("didn't find it and wasn't asked to create it\n"));
745 error = ENOENT;
746 goto done2;
747 }
748
749 found:
750 /* Construct the unique msqid */
751 td->td_retval[0] = IXSEQ_TO_IPCID(msqid, msqkptr->u.msg_perm);
752 done2:
753 mtx_unlock(&msq_mtx);
754 return (error);
755 }
756
757 #ifndef _SYS_SYSPROTO_H_
758 struct msgsnd_args {
759 int msqid;
760 const void *msgp;
761 size_t msgsz;
762 int msgflg;
763 };
764 #endif
765 int
kern_msgsnd(td,msqid,msgp,msgsz,msgflg,mtype)766 kern_msgsnd(td, msqid, msgp, msgsz, msgflg, mtype)
767 struct thread *td;
768 int msqid;
769 const void *msgp; /* XXX msgp is actually mtext. */
770 size_t msgsz;
771 int msgflg;
772 long mtype;
773 {
774 int msqix, segs_needed, error = 0;
775 register struct msqid_kernel *msqkptr;
776 register struct msg *msghdr;
777 struct prison *rpr;
778 short next;
779 #ifdef RACCT
780 size_t saved_msgsz;
781 #endif
782
783 rpr = msg_find_prison(td->td_ucred);
784 if (rpr == NULL)
785 return (ENOSYS);
786
787 mtx_lock(&msq_mtx);
788 msqix = IPCID_TO_IX(msqid);
789
790 if (msqix < 0 || msqix >= msginfo.msgmni) {
791 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix,
792 msginfo.msgmni));
793 error = EINVAL;
794 goto done2;
795 }
796
797 msqkptr = &msqids[msqix];
798 if (msqkptr->u.msg_qbytes == 0) {
799 DPRINTF(("no such message queue id\n"));
800 error = EINVAL;
801 goto done2;
802 }
803 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) {
804 DPRINTF(("wrong sequence number\n"));
805 error = EINVAL;
806 goto done2;
807 }
808
809 if ((error = msq_prison_cansee(rpr, msqkptr))) {
810 DPRINTF(("requester can't see prison\n"));
811 goto done2;
812 }
813
814 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_W))) {
815 DPRINTF(("requester doesn't have write access\n"));
816 goto done2;
817 }
818
819 #ifdef MAC
820 error = mac_sysvmsq_check_msqsnd(td->td_ucred, msqkptr);
821 if (error != 0)
822 goto done2;
823 #endif
824
825 #ifdef RACCT
826 if (racct_enable) {
827 PROC_LOCK(td->td_proc);
828 if (racct_add(td->td_proc, RACCT_MSGQQUEUED, 1)) {
829 PROC_UNLOCK(td->td_proc);
830 error = EAGAIN;
831 goto done2;
832 }
833 saved_msgsz = msgsz;
834 if (racct_add(td->td_proc, RACCT_MSGQSIZE, msgsz)) {
835 racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1);
836 PROC_UNLOCK(td->td_proc);
837 error = EAGAIN;
838 goto done2;
839 }
840 PROC_UNLOCK(td->td_proc);
841 }
842 #endif
843
844 segs_needed = (msgsz + msginfo.msgssz - 1) / msginfo.msgssz;
845 DPRINTF(("msgsz=%zu, msgssz=%d, segs_needed=%d\n", msgsz,
846 msginfo.msgssz, segs_needed));
847 for (;;) {
848 int need_more_resources = 0;
849
850 /*
851 * check msgsz
852 * (inside this loop in case msg_qbytes changes while we sleep)
853 */
854
855 if (msgsz > msqkptr->u.msg_qbytes) {
856 DPRINTF(("msgsz > msqkptr->u.msg_qbytes\n"));
857 error = EINVAL;
858 goto done3;
859 }
860
861 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) {
862 DPRINTF(("msqid is locked\n"));
863 need_more_resources = 1;
864 }
865 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) {
866 DPRINTF(("msgsz + msg_cbytes > msg_qbytes\n"));
867 need_more_resources = 1;
868 }
869 if (segs_needed > nfree_msgmaps) {
870 DPRINTF(("segs_needed > nfree_msgmaps\n"));
871 need_more_resources = 1;
872 }
873 if (free_msghdrs == NULL) {
874 DPRINTF(("no more msghdrs\n"));
875 need_more_resources = 1;
876 }
877
878 if (need_more_resources) {
879 int we_own_it;
880
881 if ((msgflg & IPC_NOWAIT) != 0) {
882 DPRINTF(("need more resources but caller "
883 "doesn't want to wait\n"));
884 error = EAGAIN;
885 goto done3;
886 }
887
888 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) {
889 DPRINTF(("we don't own the msqid_ds\n"));
890 we_own_it = 0;
891 } else {
892 /* Force later arrivals to wait for our
893 request */
894 DPRINTF(("we own the msqid_ds\n"));
895 msqkptr->u.msg_perm.mode |= MSG_LOCKED;
896 we_own_it = 1;
897 }
898 DPRINTF(("msgsnd: goodnight\n"));
899 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH,
900 "msgsnd", hz);
901 DPRINTF(("msgsnd: good morning, error=%d\n", error));
902 if (we_own_it)
903 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED;
904 if (error == EWOULDBLOCK) {
905 DPRINTF(("msgsnd: timed out\n"));
906 continue;
907 }
908 if (error != 0) {
909 DPRINTF(("msgsnd: interrupted system call\n"));
910 error = EINTR;
911 goto done3;
912 }
913
914 /*
915 * Make sure that the msq queue still exists
916 */
917
918 if (msqkptr->u.msg_qbytes == 0) {
919 DPRINTF(("msqid deleted\n"));
920 error = EIDRM;
921 goto done3;
922 }
923
924 } else {
925 DPRINTF(("got all the resources that we need\n"));
926 break;
927 }
928 }
929
930 /*
931 * We have the resources that we need.
932 * Make sure!
933 */
934
935 if (msqkptr->u.msg_perm.mode & MSG_LOCKED)
936 panic("msg_perm.mode & MSG_LOCKED");
937 if (segs_needed > nfree_msgmaps)
938 panic("segs_needed > nfree_msgmaps");
939 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes)
940 panic("msgsz + msg_cbytes > msg_qbytes");
941 if (free_msghdrs == NULL)
942 panic("no more msghdrs");
943
944 /*
945 * Re-lock the msqid_ds in case we page-fault when copying in the
946 * message
947 */
948
949 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0)
950 panic("msqid_ds is already locked");
951 msqkptr->u.msg_perm.mode |= MSG_LOCKED;
952
953 /*
954 * Allocate a message header
955 */
956
957 msghdr = free_msghdrs;
958 free_msghdrs = msghdr->msg_next;
959 msghdr->msg_spot = -1;
960 msghdr->msg_ts = msgsz;
961 msghdr->msg_type = mtype;
962 #ifdef MAC
963 /*
964 * XXXMAC: Should the mac_sysvmsq_check_msgmsq check follow here
965 * immediately? Or, should it be checked just before the msg is
966 * enqueued in the msgq (as it is done now)?
967 */
968 mac_sysvmsg_create(td->td_ucred, msqkptr, msghdr);
969 #endif
970
971 /*
972 * Allocate space for the message
973 */
974
975 while (segs_needed > 0) {
976 if (nfree_msgmaps <= 0)
977 panic("not enough msgmaps");
978 if (free_msgmaps == -1)
979 panic("nil free_msgmaps");
980 next = free_msgmaps;
981 if (next <= -1)
982 panic("next too low #1");
983 if (next >= msginfo.msgseg)
984 panic("next out of range #1");
985 DPRINTF(("allocating segment %d to message\n", next));
986 free_msgmaps = msgmaps[next].next;
987 nfree_msgmaps--;
988 msgmaps[next].next = msghdr->msg_spot;
989 msghdr->msg_spot = next;
990 segs_needed--;
991 }
992
993 /*
994 * Validate the message type
995 */
996
997 if (msghdr->msg_type < 1) {
998 msg_freehdr(msghdr);
999 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED;
1000 wakeup(msqkptr);
1001 DPRINTF(("mtype (%ld) < 1\n", msghdr->msg_type));
1002 error = EINVAL;
1003 goto done3;
1004 }
1005
1006 /*
1007 * Copy in the message body
1008 */
1009
1010 next = msghdr->msg_spot;
1011 while (msgsz > 0) {
1012 size_t tlen;
1013 if (msgsz > msginfo.msgssz)
1014 tlen = msginfo.msgssz;
1015 else
1016 tlen = msgsz;
1017 if (next <= -1)
1018 panic("next too low #2");
1019 if (next >= msginfo.msgseg)
1020 panic("next out of range #2");
1021 mtx_unlock(&msq_mtx);
1022 if ((error = copyin(msgp, &msgpool[next * msginfo.msgssz],
1023 tlen)) != 0) {
1024 mtx_lock(&msq_mtx);
1025 DPRINTF(("error %d copying in message segment\n",
1026 error));
1027 msg_freehdr(msghdr);
1028 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED;
1029 wakeup(msqkptr);
1030 goto done3;
1031 }
1032 mtx_lock(&msq_mtx);
1033 msgsz -= tlen;
1034 msgp = (const char *)msgp + tlen;
1035 next = msgmaps[next].next;
1036 }
1037 if (next != -1)
1038 panic("didn't use all the msg segments");
1039
1040 /*
1041 * We've got the message. Unlock the msqid_ds.
1042 */
1043
1044 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED;
1045
1046 /*
1047 * Make sure that the msqid_ds is still allocated.
1048 */
1049
1050 if (msqkptr->u.msg_qbytes == 0) {
1051 msg_freehdr(msghdr);
1052 wakeup(msqkptr);
1053 error = EIDRM;
1054 goto done3;
1055 }
1056
1057 #ifdef MAC
1058 /*
1059 * Note: Since the task/thread allocates the msghdr and usually
1060 * primes it with its own MAC label, for a majority of policies, it
1061 * won't be necessary to check whether the msghdr has access
1062 * permissions to the msgq. The mac_sysvmsq_check_msqsnd check would
1063 * suffice in that case. However, this hook may be required where
1064 * individual policies derive a non-identical label for the msghdr
1065 * from the current thread label and may want to check the msghdr
1066 * enqueue permissions, along with read/write permissions to the
1067 * msgq.
1068 */
1069 error = mac_sysvmsq_check_msgmsq(td->td_ucred, msghdr, msqkptr);
1070 if (error != 0) {
1071 msg_freehdr(msghdr);
1072 wakeup(msqkptr);
1073 goto done3;
1074 }
1075 #endif
1076
1077 /*
1078 * Put the message into the queue
1079 */
1080 if (msqkptr->u.msg_first == NULL) {
1081 msqkptr->u.msg_first = msghdr;
1082 msqkptr->u.msg_last = msghdr;
1083 } else {
1084 msqkptr->u.msg_last->msg_next = msghdr;
1085 msqkptr->u.msg_last = msghdr;
1086 }
1087 msqkptr->u.msg_last->msg_next = NULL;
1088
1089 msqkptr->u.msg_cbytes += msghdr->msg_ts;
1090 msqkptr->u.msg_qnum++;
1091 msqkptr->u.msg_lspid = td->td_proc->p_pid;
1092 msqkptr->u.msg_stime = time_second;
1093
1094 wakeup(msqkptr);
1095 td->td_retval[0] = 0;
1096 done3:
1097 #ifdef RACCT
1098 if (racct_enable && error != 0) {
1099 PROC_LOCK(td->td_proc);
1100 racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1);
1101 racct_sub(td->td_proc, RACCT_MSGQSIZE, saved_msgsz);
1102 PROC_UNLOCK(td->td_proc);
1103 }
1104 #endif
1105 done2:
1106 mtx_unlock(&msq_mtx);
1107 return (error);
1108 }
1109
1110 int
sys_msgsnd(td,uap)1111 sys_msgsnd(td, uap)
1112 struct thread *td;
1113 register struct msgsnd_args *uap;
1114 {
1115 int error;
1116 long mtype;
1117
1118 DPRINTF(("call to msgsnd(%d, %p, %zu, %d)\n", uap->msqid, uap->msgp,
1119 uap->msgsz, uap->msgflg));
1120
1121 if ((error = copyin(uap->msgp, &mtype, sizeof(mtype))) != 0) {
1122 DPRINTF(("error %d copying the message type\n", error));
1123 return (error);
1124 }
1125 return (kern_msgsnd(td, uap->msqid,
1126 (const char *)uap->msgp + sizeof(mtype),
1127 uap->msgsz, uap->msgflg, mtype));
1128 }
1129
1130 #ifndef _SYS_SYSPROTO_H_
1131 struct msgrcv_args {
1132 int msqid;
1133 void *msgp;
1134 size_t msgsz;
1135 long msgtyp;
1136 int msgflg;
1137 };
1138 #endif
1139 int
kern_msgrcv(td,msqid,msgp,msgsz,msgtyp,msgflg,mtype)1140 kern_msgrcv(td, msqid, msgp, msgsz, msgtyp, msgflg, mtype)
1141 struct thread *td;
1142 int msqid;
1143 void *msgp; /* XXX msgp is actually mtext. */
1144 size_t msgsz;
1145 long msgtyp;
1146 int msgflg;
1147 long *mtype;
1148 {
1149 size_t len;
1150 register struct msqid_kernel *msqkptr;
1151 register struct msg *msghdr;
1152 struct prison *rpr;
1153 int msqix, error = 0;
1154 short next;
1155
1156 rpr = msg_find_prison(td->td_ucred);
1157 if (rpr == NULL)
1158 return (ENOSYS);
1159
1160 msqix = IPCID_TO_IX(msqid);
1161
1162 if (msqix < 0 || msqix >= msginfo.msgmni) {
1163 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix,
1164 msginfo.msgmni));
1165 return (EINVAL);
1166 }
1167
1168 msqkptr = &msqids[msqix];
1169 mtx_lock(&msq_mtx);
1170 if (msqkptr->u.msg_qbytes == 0) {
1171 DPRINTF(("no such message queue id\n"));
1172 error = EINVAL;
1173 goto done2;
1174 }
1175 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) {
1176 DPRINTF(("wrong sequence number\n"));
1177 error = EINVAL;
1178 goto done2;
1179 }
1180
1181 if ((error = msq_prison_cansee(rpr, msqkptr))) {
1182 DPRINTF(("requester can't see prison\n"));
1183 goto done2;
1184 }
1185
1186 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) {
1187 DPRINTF(("requester doesn't have read access\n"));
1188 goto done2;
1189 }
1190
1191 #ifdef MAC
1192 error = mac_sysvmsq_check_msqrcv(td->td_ucred, msqkptr);
1193 if (error != 0)
1194 goto done2;
1195 #endif
1196
1197 msghdr = NULL;
1198 while (msghdr == NULL) {
1199 if (msgtyp == 0) {
1200 msghdr = msqkptr->u.msg_first;
1201 if (msghdr != NULL) {
1202 if (msgsz < msghdr->msg_ts &&
1203 (msgflg & MSG_NOERROR) == 0) {
1204 DPRINTF(("first message on the queue "
1205 "is too big (want %zu, got %d)\n",
1206 msgsz, msghdr->msg_ts));
1207 error = E2BIG;
1208 goto done2;
1209 }
1210 #ifdef MAC
1211 error = mac_sysvmsq_check_msgrcv(td->td_ucred,
1212 msghdr);
1213 if (error != 0)
1214 goto done2;
1215 #endif
1216 if (msqkptr->u.msg_first == msqkptr->u.msg_last) {
1217 msqkptr->u.msg_first = NULL;
1218 msqkptr->u.msg_last = NULL;
1219 } else {
1220 msqkptr->u.msg_first = msghdr->msg_next;
1221 if (msqkptr->u.msg_first == NULL)
1222 panic("msg_first/last screwed up #1");
1223 }
1224 }
1225 } else {
1226 struct msg *previous;
1227 struct msg **prev;
1228
1229 previous = NULL;
1230 prev = &(msqkptr->u.msg_first);
1231 while ((msghdr = *prev) != NULL) {
1232 /*
1233 * Is this message's type an exact match or is
1234 * this message's type less than or equal to
1235 * the absolute value of a negative msgtyp?
1236 * Note that the second half of this test can
1237 * NEVER be true if msgtyp is positive since
1238 * msg_type is always positive!
1239 */
1240
1241 if (msgtyp == msghdr->msg_type ||
1242 msghdr->msg_type <= -msgtyp) {
1243 DPRINTF(("found message type %ld, "
1244 "requested %ld\n",
1245 msghdr->msg_type, msgtyp));
1246 if (msgsz < msghdr->msg_ts &&
1247 (msgflg & MSG_NOERROR) == 0) {
1248 DPRINTF(("requested message "
1249 "on the queue is too big "
1250 "(want %zu, got %hu)\n",
1251 msgsz, msghdr->msg_ts));
1252 error = E2BIG;
1253 goto done2;
1254 }
1255 #ifdef MAC
1256 error = mac_sysvmsq_check_msgrcv(
1257 td->td_ucred, msghdr);
1258 if (error != 0)
1259 goto done2;
1260 #endif
1261 *prev = msghdr->msg_next;
1262 if (msghdr == msqkptr->u.msg_last) {
1263 if (previous == NULL) {
1264 if (prev !=
1265 &msqkptr->u.msg_first)
1266 panic("msg_first/last screwed up #2");
1267 msqkptr->u.msg_first =
1268 NULL;
1269 msqkptr->u.msg_last =
1270 NULL;
1271 } else {
1272 if (prev ==
1273 &msqkptr->u.msg_first)
1274 panic("msg_first/last screwed up #3");
1275 msqkptr->u.msg_last =
1276 previous;
1277 }
1278 }
1279 break;
1280 }
1281 previous = msghdr;
1282 prev = &(msghdr->msg_next);
1283 }
1284 }
1285
1286 /*
1287 * We've either extracted the msghdr for the appropriate
1288 * message or there isn't one.
1289 * If there is one then bail out of this loop.
1290 */
1291
1292 if (msghdr != NULL)
1293 break;
1294
1295 /*
1296 * Hmph! No message found. Does the user want to wait?
1297 */
1298
1299 if ((msgflg & IPC_NOWAIT) != 0) {
1300 DPRINTF(("no appropriate message found (msgtyp=%ld)\n",
1301 msgtyp));
1302 /* The SVID says to return ENOMSG. */
1303 error = ENOMSG;
1304 goto done2;
1305 }
1306
1307 /*
1308 * Wait for something to happen
1309 */
1310
1311 DPRINTF(("msgrcv: goodnight\n"));
1312 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH,
1313 "msgrcv", 0);
1314 DPRINTF(("msgrcv: good morning (error=%d)\n", error));
1315
1316 if (error != 0) {
1317 DPRINTF(("msgrcv: interrupted system call\n"));
1318 error = EINTR;
1319 goto done2;
1320 }
1321
1322 /*
1323 * Make sure that the msq queue still exists
1324 */
1325
1326 if (msqkptr->u.msg_qbytes == 0 ||
1327 msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) {
1328 DPRINTF(("msqid deleted\n"));
1329 error = EIDRM;
1330 goto done2;
1331 }
1332 }
1333
1334 /*
1335 * Return the message to the user.
1336 *
1337 * First, do the bookkeeping (before we risk being interrupted).
1338 */
1339
1340 msqkptr->u.msg_cbytes -= msghdr->msg_ts;
1341 msqkptr->u.msg_qnum--;
1342 msqkptr->u.msg_lrpid = td->td_proc->p_pid;
1343 msqkptr->u.msg_rtime = time_second;
1344
1345 racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, 1);
1346 racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msghdr->msg_ts);
1347
1348 /*
1349 * Make msgsz the actual amount that we'll be returning.
1350 * Note that this effectively truncates the message if it is too long
1351 * (since msgsz is never increased).
1352 */
1353
1354 DPRINTF(("found a message, msgsz=%zu, msg_ts=%hu\n", msgsz,
1355 msghdr->msg_ts));
1356 if (msgsz > msghdr->msg_ts)
1357 msgsz = msghdr->msg_ts;
1358 *mtype = msghdr->msg_type;
1359
1360 /*
1361 * Return the segments to the user
1362 */
1363
1364 next = msghdr->msg_spot;
1365 for (len = 0; len < msgsz; len += msginfo.msgssz) {
1366 size_t tlen;
1367
1368 if (msgsz - len > msginfo.msgssz)
1369 tlen = msginfo.msgssz;
1370 else
1371 tlen = msgsz - len;
1372 if (next <= -1)
1373 panic("next too low #3");
1374 if (next >= msginfo.msgseg)
1375 panic("next out of range #3");
1376 mtx_unlock(&msq_mtx);
1377 error = copyout(&msgpool[next * msginfo.msgssz], msgp, tlen);
1378 mtx_lock(&msq_mtx);
1379 if (error != 0) {
1380 DPRINTF(("error (%d) copying out message segment\n",
1381 error));
1382 msg_freehdr(msghdr);
1383 wakeup(msqkptr);
1384 goto done2;
1385 }
1386 msgp = (char *)msgp + tlen;
1387 next = msgmaps[next].next;
1388 }
1389
1390 /*
1391 * Done, return the actual number of bytes copied out.
1392 */
1393
1394 msg_freehdr(msghdr);
1395 wakeup(msqkptr);
1396 td->td_retval[0] = msgsz;
1397 done2:
1398 mtx_unlock(&msq_mtx);
1399 return (error);
1400 }
1401
1402 int
sys_msgrcv(td,uap)1403 sys_msgrcv(td, uap)
1404 struct thread *td;
1405 register struct msgrcv_args *uap;
1406 {
1407 int error;
1408 long mtype;
1409
1410 DPRINTF(("call to msgrcv(%d, %p, %zu, %ld, %d)\n", uap->msqid,
1411 uap->msgp, uap->msgsz, uap->msgtyp, uap->msgflg));
1412
1413 if ((error = kern_msgrcv(td, uap->msqid,
1414 (char *)uap->msgp + sizeof(mtype), uap->msgsz,
1415 uap->msgtyp, uap->msgflg, &mtype)) != 0)
1416 return (error);
1417 if ((error = copyout(&mtype, uap->msgp, sizeof(mtype))) != 0)
1418 DPRINTF(("error %d copying the message type\n", error));
1419 return (error);
1420 }
1421
1422 static int
sysctl_msqids(SYSCTL_HANDLER_ARGS)1423 sysctl_msqids(SYSCTL_HANDLER_ARGS)
1424 {
1425 struct msqid_kernel tmsqk;
1426 struct prison *pr, *rpr;
1427 int error, i;
1428
1429 pr = req->td->td_ucred->cr_prison;
1430 rpr = msg_find_prison(req->td->td_ucred);
1431 error = 0;
1432 for (i = 0; i < msginfo.msgmni; i++) {
1433 mtx_lock(&msq_mtx);
1434 if (msqids[i].u.msg_qbytes == 0 || rpr == NULL ||
1435 msq_prison_cansee(rpr, &msqids[i]) != 0)
1436 bzero(&tmsqk, sizeof(tmsqk));
1437 else {
1438 tmsqk = msqids[i];
1439 if (tmsqk.cred->cr_prison != pr)
1440 tmsqk.u.msg_perm.key = IPC_PRIVATE;
1441 }
1442 mtx_unlock(&msq_mtx);
1443 error = SYSCTL_OUT(req, &tmsqk, sizeof(tmsqk));
1444 if (error != 0)
1445 break;
1446 }
1447 return (error);
1448 }
1449
1450 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmax, CTLFLAG_RD, &msginfo.msgmax, 0,
1451 "Maximum message size");
1452 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmni, CTLFLAG_RDTUN, &msginfo.msgmni, 0,
1453 "Number of message queue identifiers");
1454 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmnb, CTLFLAG_RDTUN, &msginfo.msgmnb, 0,
1455 "Maximum number of bytes in a queue");
1456 SYSCTL_INT(_kern_ipc, OID_AUTO, msgtql, CTLFLAG_RDTUN, &msginfo.msgtql, 0,
1457 "Maximum number of messages in the system");
1458 SYSCTL_INT(_kern_ipc, OID_AUTO, msgssz, CTLFLAG_RDTUN, &msginfo.msgssz, 0,
1459 "Size of a message segment");
1460 SYSCTL_INT(_kern_ipc, OID_AUTO, msgseg, CTLFLAG_RDTUN, &msginfo.msgseg, 0,
1461 "Number of message segments");
1462 SYSCTL_PROC(_kern_ipc, OID_AUTO, msqids,
1463 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE,
1464 NULL, 0, sysctl_msqids, "",
1465 "Array of struct msqid_kernel for each potential message queue");
1466
1467 static int
msg_prison_check(void * obj,void * data)1468 msg_prison_check(void *obj, void *data)
1469 {
1470 struct prison *pr = obj;
1471 struct prison *prpr;
1472 struct vfsoptlist *opts = data;
1473 int error, jsys;
1474
1475 /*
1476 * sysvmsg is a jailsys integer.
1477 * It must be "disable" if the parent jail is disabled.
1478 */
1479 error = vfs_copyopt(opts, "sysvmsg", &jsys, sizeof(jsys));
1480 if (error != ENOENT) {
1481 if (error != 0)
1482 return (error);
1483 switch (jsys) {
1484 case JAIL_SYS_DISABLE:
1485 break;
1486 case JAIL_SYS_NEW:
1487 case JAIL_SYS_INHERIT:
1488 prison_lock(pr->pr_parent);
1489 prpr = osd_jail_get(pr->pr_parent, msg_prison_slot);
1490 prison_unlock(pr->pr_parent);
1491 if (prpr == NULL)
1492 return (EPERM);
1493 break;
1494 default:
1495 return (EINVAL);
1496 }
1497 }
1498
1499 return (0);
1500 }
1501
1502 static int
msg_prison_set(void * obj,void * data)1503 msg_prison_set(void *obj, void *data)
1504 {
1505 struct prison *pr = obj;
1506 struct prison *tpr, *orpr, *nrpr, *trpr;
1507 struct vfsoptlist *opts = data;
1508 void *rsv;
1509 int jsys, descend;
1510
1511 /*
1512 * sysvmsg controls which jail is the root of the associated msgs (this
1513 * jail or same as the parent), or if the feature is available at all.
1514 */
1515 if (vfs_copyopt(opts, "sysvmsg", &jsys, sizeof(jsys)) == ENOENT)
1516 jsys = vfs_flagopt(opts, "allow.sysvipc", NULL, 0)
1517 ? JAIL_SYS_INHERIT
1518 : vfs_flagopt(opts, "allow.nosysvipc", NULL, 0)
1519 ? JAIL_SYS_DISABLE
1520 : -1;
1521 if (jsys == JAIL_SYS_DISABLE) {
1522 prison_lock(pr);
1523 orpr = osd_jail_get(pr, msg_prison_slot);
1524 if (orpr != NULL)
1525 osd_jail_del(pr, msg_prison_slot);
1526 prison_unlock(pr);
1527 if (orpr != NULL) {
1528 if (orpr == pr)
1529 msg_prison_cleanup(pr);
1530 /* Disable all child jails as well. */
1531 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1532 prison_lock(tpr);
1533 trpr = osd_jail_get(tpr, msg_prison_slot);
1534 if (trpr != NULL) {
1535 osd_jail_del(tpr, msg_prison_slot);
1536 prison_unlock(tpr);
1537 if (trpr == tpr)
1538 msg_prison_cleanup(tpr);
1539 } else {
1540 prison_unlock(tpr);
1541 descend = 0;
1542 }
1543 }
1544 }
1545 } else if (jsys != -1) {
1546 if (jsys == JAIL_SYS_NEW)
1547 nrpr = pr;
1548 else {
1549 prison_lock(pr->pr_parent);
1550 nrpr = osd_jail_get(pr->pr_parent, msg_prison_slot);
1551 prison_unlock(pr->pr_parent);
1552 }
1553 rsv = osd_reserve(msg_prison_slot);
1554 prison_lock(pr);
1555 orpr = osd_jail_get(pr, msg_prison_slot);
1556 if (orpr != nrpr)
1557 (void)osd_jail_set_reserved(pr, msg_prison_slot, rsv,
1558 nrpr);
1559 else
1560 osd_free_reserved(rsv);
1561 prison_unlock(pr);
1562 if (orpr != nrpr) {
1563 if (orpr == pr)
1564 msg_prison_cleanup(pr);
1565 if (orpr != NULL) {
1566 /* Change child jails matching the old root, */
1567 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1568 prison_lock(tpr);
1569 trpr = osd_jail_get(tpr,
1570 msg_prison_slot);
1571 if (trpr == orpr) {
1572 (void)osd_jail_set(tpr,
1573 msg_prison_slot, nrpr);
1574 prison_unlock(tpr);
1575 if (trpr == tpr)
1576 msg_prison_cleanup(tpr);
1577 } else {
1578 prison_unlock(tpr);
1579 descend = 0;
1580 }
1581 }
1582 }
1583 }
1584 }
1585
1586 return (0);
1587 }
1588
1589 static int
msg_prison_get(void * obj,void * data)1590 msg_prison_get(void *obj, void *data)
1591 {
1592 struct prison *pr = obj;
1593 struct prison *rpr;
1594 struct vfsoptlist *opts = data;
1595 int error, jsys;
1596
1597 /* Set sysvmsg based on the jail's root prison. */
1598 prison_lock(pr);
1599 rpr = osd_jail_get(pr, msg_prison_slot);
1600 prison_unlock(pr);
1601 jsys = rpr == NULL ? JAIL_SYS_DISABLE
1602 : rpr == pr ? JAIL_SYS_NEW : JAIL_SYS_INHERIT;
1603 error = vfs_setopt(opts, "sysvmsg", &jsys, sizeof(jsys));
1604 if (error == ENOENT)
1605 error = 0;
1606 return (error);
1607 }
1608
1609 static int
msg_prison_remove(void * obj,void * data __unused)1610 msg_prison_remove(void *obj, void *data __unused)
1611 {
1612 struct prison *pr = obj;
1613 struct prison *rpr;
1614
1615 prison_lock(pr);
1616 rpr = osd_jail_get(pr, msg_prison_slot);
1617 prison_unlock(pr);
1618 if (rpr == pr)
1619 msg_prison_cleanup(pr);
1620 return (0);
1621 }
1622
1623 static void
msg_prison_cleanup(struct prison * pr)1624 msg_prison_cleanup(struct prison *pr)
1625 {
1626 struct msqid_kernel *msqkptr;
1627 int i;
1628
1629 /* Remove any msqs that belong to this jail. */
1630 mtx_lock(&msq_mtx);
1631 for (i = 0; i < msginfo.msgmni; i++) {
1632 msqkptr = &msqids[i];
1633 if (msqkptr->u.msg_qbytes != 0 &&
1634 msqkptr->cred != NULL && msqkptr->cred->cr_prison == pr)
1635 msq_remove(msqkptr);
1636 }
1637 mtx_unlock(&msq_mtx);
1638 }
1639
1640 SYSCTL_JAIL_PARAM_SYS_NODE(sysvmsg, CTLFLAG_RW, "SYSV message queues");
1641
1642 #ifdef COMPAT_FREEBSD32
1643 int
freebsd32_msgsys(struct thread * td,struct freebsd32_msgsys_args * uap)1644 freebsd32_msgsys(struct thread *td, struct freebsd32_msgsys_args *uap)
1645 {
1646
1647 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1648 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1649 switch (uap->which) {
1650 case 0:
1651 return (freebsd7_freebsd32_msgctl(td,
1652 (struct freebsd7_freebsd32_msgctl_args *)&uap->a2));
1653 case 2:
1654 return (freebsd32_msgsnd(td,
1655 (struct freebsd32_msgsnd_args *)&uap->a2));
1656 case 3:
1657 return (freebsd32_msgrcv(td,
1658 (struct freebsd32_msgrcv_args *)&uap->a2));
1659 default:
1660 return (sys_msgsys(td, (struct msgsys_args *)uap));
1661 }
1662 #else
1663 return (nosys(td, NULL));
1664 #endif
1665 }
1666
1667 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1668 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1669 int
freebsd7_freebsd32_msgctl(struct thread * td,struct freebsd7_freebsd32_msgctl_args * uap)1670 freebsd7_freebsd32_msgctl(struct thread *td,
1671 struct freebsd7_freebsd32_msgctl_args *uap)
1672 {
1673 struct msqid_ds msqbuf;
1674 struct msqid_ds32_old msqbuf32;
1675 int error;
1676
1677 if (uap->cmd == IPC_SET) {
1678 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32));
1679 if (error)
1680 return (error);
1681 freebsd32_ipcperm_old_in(&msqbuf32.msg_perm, &msqbuf.msg_perm);
1682 PTRIN_CP(msqbuf32, msqbuf, msg_first);
1683 PTRIN_CP(msqbuf32, msqbuf, msg_last);
1684 CP(msqbuf32, msqbuf, msg_cbytes);
1685 CP(msqbuf32, msqbuf, msg_qnum);
1686 CP(msqbuf32, msqbuf, msg_qbytes);
1687 CP(msqbuf32, msqbuf, msg_lspid);
1688 CP(msqbuf32, msqbuf, msg_lrpid);
1689 CP(msqbuf32, msqbuf, msg_stime);
1690 CP(msqbuf32, msqbuf, msg_rtime);
1691 CP(msqbuf32, msqbuf, msg_ctime);
1692 }
1693 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf);
1694 if (error)
1695 return (error);
1696 if (uap->cmd == IPC_STAT) {
1697 bzero(&msqbuf32, sizeof(msqbuf32));
1698 freebsd32_ipcperm_old_out(&msqbuf.msg_perm, &msqbuf32.msg_perm);
1699 PTROUT_CP(msqbuf, msqbuf32, msg_first);
1700 PTROUT_CP(msqbuf, msqbuf32, msg_last);
1701 CP(msqbuf, msqbuf32, msg_cbytes);
1702 CP(msqbuf, msqbuf32, msg_qnum);
1703 CP(msqbuf, msqbuf32, msg_qbytes);
1704 CP(msqbuf, msqbuf32, msg_lspid);
1705 CP(msqbuf, msqbuf32, msg_lrpid);
1706 CP(msqbuf, msqbuf32, msg_stime);
1707 CP(msqbuf, msqbuf32, msg_rtime);
1708 CP(msqbuf, msqbuf32, msg_ctime);
1709 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32));
1710 }
1711 return (error);
1712 }
1713 #endif
1714
1715 int
freebsd32_msgctl(struct thread * td,struct freebsd32_msgctl_args * uap)1716 freebsd32_msgctl(struct thread *td, struct freebsd32_msgctl_args *uap)
1717 {
1718 struct msqid_ds msqbuf;
1719 struct msqid_ds32 msqbuf32;
1720 int error;
1721
1722 if (uap->cmd == IPC_SET) {
1723 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32));
1724 if (error)
1725 return (error);
1726 freebsd32_ipcperm_in(&msqbuf32.msg_perm, &msqbuf.msg_perm);
1727 PTRIN_CP(msqbuf32, msqbuf, msg_first);
1728 PTRIN_CP(msqbuf32, msqbuf, msg_last);
1729 CP(msqbuf32, msqbuf, msg_cbytes);
1730 CP(msqbuf32, msqbuf, msg_qnum);
1731 CP(msqbuf32, msqbuf, msg_qbytes);
1732 CP(msqbuf32, msqbuf, msg_lspid);
1733 CP(msqbuf32, msqbuf, msg_lrpid);
1734 CP(msqbuf32, msqbuf, msg_stime);
1735 CP(msqbuf32, msqbuf, msg_rtime);
1736 CP(msqbuf32, msqbuf, msg_ctime);
1737 }
1738 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf);
1739 if (error)
1740 return (error);
1741 if (uap->cmd == IPC_STAT) {
1742 freebsd32_ipcperm_out(&msqbuf.msg_perm, &msqbuf32.msg_perm);
1743 PTROUT_CP(msqbuf, msqbuf32, msg_first);
1744 PTROUT_CP(msqbuf, msqbuf32, msg_last);
1745 CP(msqbuf, msqbuf32, msg_cbytes);
1746 CP(msqbuf, msqbuf32, msg_qnum);
1747 CP(msqbuf, msqbuf32, msg_qbytes);
1748 CP(msqbuf, msqbuf32, msg_lspid);
1749 CP(msqbuf, msqbuf32, msg_lrpid);
1750 CP(msqbuf, msqbuf32, msg_stime);
1751 CP(msqbuf, msqbuf32, msg_rtime);
1752 CP(msqbuf, msqbuf32, msg_ctime);
1753 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32));
1754 }
1755 return (error);
1756 }
1757
1758 int
freebsd32_msgsnd(struct thread * td,struct freebsd32_msgsnd_args * uap)1759 freebsd32_msgsnd(struct thread *td, struct freebsd32_msgsnd_args *uap)
1760 {
1761 const void *msgp;
1762 long mtype;
1763 int32_t mtype32;
1764 int error;
1765
1766 msgp = PTRIN(uap->msgp);
1767 if ((error = copyin(msgp, &mtype32, sizeof(mtype32))) != 0)
1768 return (error);
1769 mtype = mtype32;
1770 return (kern_msgsnd(td, uap->msqid,
1771 (const char *)msgp + sizeof(mtype32),
1772 uap->msgsz, uap->msgflg, mtype));
1773 }
1774
1775 int
freebsd32_msgrcv(struct thread * td,struct freebsd32_msgrcv_args * uap)1776 freebsd32_msgrcv(struct thread *td, struct freebsd32_msgrcv_args *uap)
1777 {
1778 void *msgp;
1779 long mtype;
1780 int32_t mtype32;
1781 int error;
1782
1783 msgp = PTRIN(uap->msgp);
1784 if ((error = kern_msgrcv(td, uap->msqid,
1785 (char *)msgp + sizeof(mtype32), uap->msgsz,
1786 uap->msgtyp, uap->msgflg, &mtype)) != 0)
1787 return (error);
1788 mtype32 = (int32_t)mtype;
1789 return (copyout(&mtype32, msgp, sizeof(mtype32)));
1790 }
1791 #endif
1792
1793 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1794 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1795
1796 /* XXX casting to (sy_call_t *) is bogus, as usual. */
1797 static sy_call_t *msgcalls[] = {
1798 (sy_call_t *)freebsd7_msgctl, (sy_call_t *)sys_msgget,
1799 (sy_call_t *)sys_msgsnd, (sy_call_t *)sys_msgrcv
1800 };
1801
1802 /*
1803 * Entry point for all MSG calls.
1804 */
1805 int
sys_msgsys(td,uap)1806 sys_msgsys(td, uap)
1807 struct thread *td;
1808 /* XXX actually varargs. */
1809 struct msgsys_args /* {
1810 int which;
1811 int a2;
1812 int a3;
1813 int a4;
1814 int a5;
1815 int a6;
1816 } */ *uap;
1817 {
1818 int error;
1819
1820 if (uap->which < 0 ||
1821 uap->which >= sizeof(msgcalls)/sizeof(msgcalls[0]))
1822 return (EINVAL);
1823 error = (*msgcalls[uap->which])(td, &uap->a2);
1824 return (error);
1825 }
1826
1827 #ifndef CP
1828 #define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0)
1829 #endif
1830
1831 #ifndef _SYS_SYSPROTO_H_
1832 struct freebsd7_msgctl_args {
1833 int msqid;
1834 int cmd;
1835 struct msqid_ds_old *buf;
1836 };
1837 #endif
1838 int
freebsd7_msgctl(td,uap)1839 freebsd7_msgctl(td, uap)
1840 struct thread *td;
1841 struct freebsd7_msgctl_args *uap;
1842 {
1843 struct msqid_ds_old msqold;
1844 struct msqid_ds msqbuf;
1845 int error;
1846
1847 DPRINTF(("call to freebsd7_msgctl(%d, %d, %p)\n", uap->msqid, uap->cmd,
1848 uap->buf));
1849 if (uap->cmd == IPC_SET) {
1850 error = copyin(uap->buf, &msqold, sizeof(msqold));
1851 if (error)
1852 return (error);
1853 ipcperm_old2new(&msqold.msg_perm, &msqbuf.msg_perm);
1854 CP(msqold, msqbuf, msg_first);
1855 CP(msqold, msqbuf, msg_last);
1856 CP(msqold, msqbuf, msg_cbytes);
1857 CP(msqold, msqbuf, msg_qnum);
1858 CP(msqold, msqbuf, msg_qbytes);
1859 CP(msqold, msqbuf, msg_lspid);
1860 CP(msqold, msqbuf, msg_lrpid);
1861 CP(msqold, msqbuf, msg_stime);
1862 CP(msqold, msqbuf, msg_rtime);
1863 CP(msqold, msqbuf, msg_ctime);
1864 }
1865 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf);
1866 if (error)
1867 return (error);
1868 if (uap->cmd == IPC_STAT) {
1869 bzero(&msqold, sizeof(msqold));
1870 ipcperm_new2old(&msqbuf.msg_perm, &msqold.msg_perm);
1871 CP(msqbuf, msqold, msg_first);
1872 CP(msqbuf, msqold, msg_last);
1873 CP(msqbuf, msqold, msg_cbytes);
1874 CP(msqbuf, msqold, msg_qnum);
1875 CP(msqbuf, msqold, msg_qbytes);
1876 CP(msqbuf, msqold, msg_lspid);
1877 CP(msqbuf, msqold, msg_lrpid);
1878 CP(msqbuf, msqold, msg_stime);
1879 CP(msqbuf, msqold, msg_rtime);
1880 CP(msqbuf, msqold, msg_ctime);
1881 error = copyout(&msqold, uap->buf, sizeof(struct msqid_ds_old));
1882 }
1883 return (error);
1884 }
1885
1886 #undef CP
1887
1888 #endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 ||
1889 COMPAT_FREEBSD7 */
1890