2 * Implementation of SVID messages
4 * Author: Daniel Boulet
6 * Copyright 1993 Daniel Boulet and RTMX Inc.
8 * This system call was implemented by Daniel Boulet under contract from RTMX.
10 * Redistribution and use in source forms, with and without modification,
11 * are permitted provided that this entire comment appears intact.
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.
17 * This software is provided ``AS IS'' without any warranties of any kind.
20 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
22 * Copyright (c) 2003-2005 McAfee, Inc.
23 * Copyright (c) 2016-2017 Robert N. M. Watson
24 * All rights reserved.
26 * This software was developed for the FreeBSD Project in part by McAfee
27 * Research, the Security Research Division of McAfee, Inc under DARPA/SPAWAR
28 * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS research
31 * Portions of this software were developed by BAE Systems, the University of
32 * Cambridge Computer Laboratory, and Memorial University under DARPA/AFRL
33 * contract FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent
34 * Computing (TC) research program.
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
45 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
48 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 #include <sys/cdefs.h>
59 __FBSDID("$FreeBSD$");
61 #include "opt_sysvipc.h"
63 #include <sys/param.h>
64 #include <sys/systm.h>
65 #include <sys/sysproto.h>
66 #include <sys/kernel.h>
70 #include <sys/mutex.h>
71 #include <sys/module.h>
72 #include <sys/mount.h>
74 #include <sys/racct.h>
76 #include <sys/syscall.h>
77 #include <sys/syscallsubr.h>
78 #include <sys/sysent.h>
79 #include <sys/sysctl.h>
80 #include <sys/malloc.h>
83 #include <security/audit/audit.h>
84 #include <security/mac/mac_framework.h>
86 FEATURE(sysv_msg, "System V message queues support");
88 static MALLOC_DEFINE(M_MSG, "msg", "SVID compatible message queues");
90 static int msginit(void);
91 static int msgunload(void);
92 static int sysvmsg_modload(struct module *, int, void *);
93 static void msq_remove(struct msqid_kernel *);
94 static struct prison *msg_find_prison(struct ucred *);
95 static int msq_prison_cansee(struct prison *, struct msqid_kernel *);
96 static int msg_prison_check(void *, void *);
97 static int msg_prison_set(void *, void *);
98 static int msg_prison_get(void *, void *);
99 static int msg_prison_remove(void *, void *);
100 static void msg_prison_cleanup(struct prison *);
103 #define DPRINTF(a) printf a
105 #define DPRINTF(a) (void)0
108 static void msg_freehdr(struct msg *msghdr);
111 #define MSGSSZ 8 /* Each segment must be 2^N long */
114 #define MSGSEG 2048 /* must be less than 32767 */
116 #define MSGMAX (MSGSSZ*MSGSEG)
118 #define MSGMNB 2048 /* max # of bytes in a queue */
128 * Based on the configuration parameters described in an SVR2 (yes, two)
129 * config(1m) man page.
131 * Each message is broken up and stored in segments that are msgssz bytes
132 * long. For efficiency reasons, this should be a power of two. Also,
133 * it doesn't make sense if it is less than 8 or greater than about 256.
134 * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of
135 * two between 8 and 1024 inclusive (and panic's if it isn't).
137 struct msginfo msginfo = {
138 MSGMAX, /* max chars in a message */
139 MSGMNI, /* # of message queue identifiers */
140 MSGMNB, /* max chars in a queue */
141 MSGTQL, /* max messages in system */
142 MSGSSZ, /* size of a message segment */
143 /* (must be small power of 2 greater than 4) */
144 MSGSEG /* number of message segments */
148 * macros to convert between msqid_ds's and msqid's.
149 * (specific to this implementation)
151 #define MSQID(ix,ds) ((ix) & 0xffff | (((ds).msg_perm.seq << 16) & 0xffff0000))
152 #define MSQID_IX(id) ((id) & 0xffff)
153 #define MSQID_SEQ(id) (((id) >> 16) & 0xffff)
156 * The rest of this file is specific to this particular implementation.
160 short next; /* next segment in buffer */
161 /* -1 -> available */
162 /* 0..(MSGSEG-1) -> index of next segment */
165 #define MSG_LOCKED 01000 /* Is this msqid_ds locked? */
167 static int nfree_msgmaps; /* # of free map entries */
168 static short free_msgmaps; /* head of linked list of free map entries */
169 static struct msg *free_msghdrs;/* list of free msg headers */
170 static char *msgpool; /* MSGMAX byte long msg buffer pool */
171 static struct msgmap *msgmaps; /* MSGSEG msgmap structures */
172 static struct msg *msghdrs; /* MSGTQL msg headers */
173 static struct msqid_kernel *msqids; /* MSGMNI msqid_kernel struct's */
174 static struct mtx msq_mtx; /* global mutex for message queues. */
175 static unsigned msg_prison_slot;/* prison OSD slot */
177 static struct syscall_helper_data msg_syscalls[] = {
178 SYSCALL_INIT_HELPER(msgctl),
179 SYSCALL_INIT_HELPER(msgget),
180 SYSCALL_INIT_HELPER(msgsnd),
181 SYSCALL_INIT_HELPER(msgrcv),
182 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
183 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
184 SYSCALL_INIT_HELPER(msgsys),
185 SYSCALL_INIT_HELPER_COMPAT(freebsd7_msgctl),
190 #ifdef COMPAT_FREEBSD32
191 #include <compat/freebsd32/freebsd32.h>
192 #include <compat/freebsd32/freebsd32_ipc.h>
193 #include <compat/freebsd32/freebsd32_proto.h>
194 #include <compat/freebsd32/freebsd32_signal.h>
195 #include <compat/freebsd32/freebsd32_syscall.h>
196 #include <compat/freebsd32/freebsd32_util.h>
198 static struct syscall_helper_data msg32_syscalls[] = {
199 SYSCALL32_INIT_HELPER(freebsd32_msgctl),
200 SYSCALL32_INIT_HELPER(freebsd32_msgsnd),
201 SYSCALL32_INIT_HELPER(freebsd32_msgrcv),
202 SYSCALL32_INIT_HELPER_COMPAT(msgget),
203 SYSCALL32_INIT_HELPER(freebsd32_msgsys),
204 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
205 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
206 SYSCALL32_INIT_HELPER(freebsd7_freebsd32_msgctl),
218 osd_method_t methods[PR_MAXMETHOD] = {
219 [PR_METHOD_CHECK] = msg_prison_check,
220 [PR_METHOD_SET] = msg_prison_set,
221 [PR_METHOD_GET] = msg_prison_get,
222 [PR_METHOD_REMOVE] = msg_prison_remove,
225 msginfo.msgmax = msginfo.msgseg * msginfo.msgssz;
226 msgpool = malloc(msginfo.msgmax, M_MSG, M_WAITOK);
227 msgmaps = malloc(sizeof(struct msgmap) * msginfo.msgseg, M_MSG, M_WAITOK);
228 msghdrs = malloc(sizeof(struct msg) * msginfo.msgtql, M_MSG, M_WAITOK);
229 msqids = malloc(sizeof(struct msqid_kernel) * msginfo.msgmni, M_MSG,
233 * msginfo.msgssz should be a power of two for efficiency reasons.
234 * It is also pretty silly if msginfo.msgssz is less than 8
235 * or greater than about 256 so ...
239 while (i < 1024 && i != msginfo.msgssz)
241 if (i != msginfo.msgssz) {
242 DPRINTF(("msginfo.msgssz=%d (0x%x)\n", msginfo.msgssz,
244 panic("msginfo.msgssz not a small power of 2");
247 if (msginfo.msgseg > 32767) {
248 DPRINTF(("msginfo.msgseg=%d\n", msginfo.msgseg));
249 panic("msginfo.msgseg > 32767");
252 for (i = 0; i < msginfo.msgseg; i++) {
254 msgmaps[i-1].next = i;
255 msgmaps[i].next = -1; /* implies entry is available */
258 nfree_msgmaps = msginfo.msgseg;
260 for (i = 0; i < msginfo.msgtql; i++) {
261 msghdrs[i].msg_type = 0;
263 msghdrs[i-1].msg_next = &msghdrs[i];
264 msghdrs[i].msg_next = NULL;
266 mac_sysvmsg_init(&msghdrs[i]);
269 free_msghdrs = &msghdrs[0];
271 for (i = 0; i < msginfo.msgmni; i++) {
272 msqids[i].u.msg_qbytes = 0; /* implies entry is available */
273 msqids[i].u.msg_perm.seq = 0; /* reset to a known value */
274 msqids[i].u.msg_perm.mode = 0;
276 mac_sysvmsq_init(&msqids[i]);
279 mtx_init(&msq_mtx, "msq", NULL, MTX_DEF);
281 /* Set current prisons according to their allow.sysvipc. */
282 msg_prison_slot = osd_jail_register(NULL, methods);
283 rsv = osd_reserve(msg_prison_slot);
284 prison_lock(&prison0);
285 (void)osd_jail_set_reserved(&prison0, msg_prison_slot, rsv, &prison0);
286 prison_unlock(&prison0);
288 sx_slock(&allprison_lock);
289 TAILQ_FOREACH(pr, &allprison, pr_list) {
291 rsv = osd_reserve(msg_prison_slot);
293 if ((pr->pr_allow & PR_ALLOW_SYSVIPC) && pr->pr_ref > 0) {
294 (void)osd_jail_set_reserved(pr, msg_prison_slot, rsv,
301 osd_free_reserved(rsv);
302 sx_sunlock(&allprison_lock);
304 error = syscall_helper_register(msg_syscalls, SY_THR_STATIC_KLD);
307 #ifdef COMPAT_FREEBSD32
308 error = syscall32_helper_register(msg32_syscalls, SY_THR_STATIC_KLD);
318 struct msqid_kernel *msqkptr;
324 syscall_helper_unregister(msg_syscalls);
325 #ifdef COMPAT_FREEBSD32
326 syscall32_helper_unregister(msg32_syscalls);
329 for (msqid = 0; msqid < msginfo.msgmni; msqid++) {
330 msqkptr = &msqids[msqid];
331 if (msqkptr->u.msg_qbytes != 0 ||
332 (msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0)
335 if (msqid != msginfo.msgmni)
338 if (msg_prison_slot != 0)
339 osd_jail_deregister(msg_prison_slot);
341 for (i = 0; i < msginfo.msgtql; i++)
342 mac_sysvmsg_destroy(&msghdrs[i]);
343 for (msqid = 0; msqid < msginfo.msgmni; msqid++)
344 mac_sysvmsq_destroy(&msqids[msqid]);
346 free(msgpool, M_MSG);
347 free(msgmaps, M_MSG);
348 free(msghdrs, M_MSG);
350 mtx_destroy(&msq_mtx);
355 sysvmsg_modload(struct module *module, int cmd, void *arg)
377 static moduledata_t sysvmsg_mod = {
383 DECLARE_MODULE(sysvmsg, sysvmsg_mod, SI_SUB_SYSV_MSG, SI_ORDER_FIRST);
384 MODULE_VERSION(sysvmsg, 1);
387 msg_freehdr(struct msg *msghdr)
389 while (msghdr->msg_ts > 0) {
391 if (msghdr->msg_spot < 0 || msghdr->msg_spot >= msginfo.msgseg)
392 panic("msghdr->msg_spot out of range");
393 next = msgmaps[msghdr->msg_spot].next;
394 msgmaps[msghdr->msg_spot].next = free_msgmaps;
395 free_msgmaps = msghdr->msg_spot;
397 msghdr->msg_spot = next;
398 if (msghdr->msg_ts >= msginfo.msgssz)
399 msghdr->msg_ts -= msginfo.msgssz;
403 if (msghdr->msg_spot != -1)
404 panic("msghdr->msg_spot != -1");
405 msghdr->msg_next = free_msghdrs;
406 free_msghdrs = msghdr;
408 mac_sysvmsg_cleanup(msghdr);
413 msq_remove(struct msqid_kernel *msqkptr)
417 racct_sub_cred(msqkptr->cred, RACCT_NMSGQ, 1);
418 racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, msqkptr->u.msg_qnum);
419 racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msqkptr->u.msg_cbytes);
420 crfree(msqkptr->cred);
421 msqkptr->cred = NULL;
423 /* Free the message headers */
424 msghdr = msqkptr->u.__msg_first;
425 while (msghdr != NULL) {
426 struct msg *msghdr_tmp;
428 /* Free the segments of each message */
429 msqkptr->u.msg_cbytes -= msghdr->msg_ts;
430 msqkptr->u.msg_qnum--;
432 msghdr = msghdr->msg_next;
433 msg_freehdr(msghdr_tmp);
436 if (msqkptr->u.msg_cbytes != 0)
437 panic("msg_cbytes is screwed up");
438 if (msqkptr->u.msg_qnum != 0)
439 panic("msg_qnum is screwed up");
441 msqkptr->u.msg_qbytes = 0; /* Mark it as free */
444 mac_sysvmsq_cleanup(msqkptr);
450 static struct prison *
451 msg_find_prison(struct ucred *cred)
453 struct prison *pr, *rpr;
455 pr = cred->cr_prison;
457 rpr = osd_jail_get(pr, msg_prison_slot);
463 msq_prison_cansee(struct prison *rpr, struct msqid_kernel *msqkptr)
466 if (msqkptr->cred == NULL ||
467 !(rpr == msqkptr->cred->cr_prison ||
468 prison_ischild(rpr, msqkptr->cred->cr_prison)))
473 #ifndef _SYS_SYSPROTO_H_
477 struct msqid_ds *buf;
481 sys_msgctl(struct thread *td, struct msgctl_args *uap)
483 int msqid = uap->msqid;
485 struct msqid_ds msqbuf;
488 DPRINTF(("call to msgctl(%d, %d, %p)\n", msqid, cmd, uap->buf));
489 if (cmd == IPC_SET &&
490 (error = copyin(uap->buf, &msqbuf, sizeof(msqbuf))) != 0)
492 error = kern_msgctl(td, msqid, cmd, &msqbuf);
493 if (cmd == IPC_STAT && error == 0)
494 error = copyout(&msqbuf, uap->buf, sizeof(struct msqid_ds));
499 kern_msgctl(struct thread *td, int msqid, int cmd, struct msqid_ds *msqbuf)
501 int rval, error, msqix;
502 struct msqid_kernel *msqkptr;
505 rpr = msg_find_prison(td->td_ucred);
509 AUDIT_ARG_SVIPC_CMD(cmd);
510 AUDIT_ARG_SVIPC_ID(msqid);
511 msqix = IPCID_TO_IX(msqid);
513 if (msqix < 0 || msqix >= msginfo.msgmni) {
514 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix,
519 msqkptr = &msqids[msqix];
522 if (msqkptr->u.msg_qbytes == 0) {
523 DPRINTF(("no such msqid\n"));
527 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) {
528 DPRINTF(("wrong sequence number\n"));
533 error = msq_prison_cansee(rpr, msqkptr);
535 DPRINTF(("requester can't see prison\n"));
540 error = mac_sysvmsq_check_msqctl(td->td_ucred, msqkptr, cmd);
555 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M)))
560 * Check that the thread has MAC access permissions to
561 * individual msghdrs. Note: We need to do this in a
562 * separate loop because the actual loop alters the
563 * msq/msghdr info as it progresses, and there is no going
564 * back if half the way through we discover that the
565 * thread cannot free a certain msghdr. The msq will get
566 * into an inconsistent state.
568 for (msghdr = msqkptr->u.__msg_first; msghdr != NULL;
569 msghdr = msghdr->msg_next) {
570 error = mac_sysvmsq_check_msgrmid(td->td_ucred, msghdr);
582 AUDIT_ARG_SVIPC_PERM(&msqbuf->msg_perm);
583 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M)))
585 if (msqbuf->msg_qbytes > msqkptr->u.msg_qbytes) {
586 error = priv_check(td, PRIV_IPC_MSGSIZE);
590 if (msqbuf->msg_qbytes > msginfo.msgmnb) {
591 DPRINTF(("can't increase msg_qbytes beyond %d"
592 "(truncating)\n", msginfo.msgmnb));
593 msqbuf->msg_qbytes = msginfo.msgmnb; /* silently restrict qbytes to system limit */
595 if (msqbuf->msg_qbytes == 0) {
596 DPRINTF(("can't reduce msg_qbytes to 0\n"));
597 error = EINVAL; /* non-standard errno! */
600 msqkptr->u.msg_perm.uid = msqbuf->msg_perm.uid; /* change the owner */
601 msqkptr->u.msg_perm.gid = msqbuf->msg_perm.gid; /* change the owner */
602 msqkptr->u.msg_perm.mode = (msqkptr->u.msg_perm.mode & ~0777) |
603 (msqbuf->msg_perm.mode & 0777);
604 msqkptr->u.msg_qbytes = msqbuf->msg_qbytes;
605 msqkptr->u.msg_ctime = time_second;
609 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) {
610 DPRINTF(("requester doesn't have read access\n"));
613 *msqbuf = msqkptr->u;
614 if (td->td_ucred->cr_prison != msqkptr->cred->cr_prison)
615 msqbuf->msg_perm.key = IPC_PRIVATE;
619 DPRINTF(("invalid command %d\n", cmd));
625 td->td_retval[0] = rval;
627 mtx_unlock(&msq_mtx);
631 #ifndef _SYS_SYSPROTO_H_
639 sys_msgget(struct thread *td, struct msgget_args *uap)
641 int msqid, error = 0;
643 int msgflg = uap->msgflg;
644 struct ucred *cred = td->td_ucred;
645 struct msqid_kernel *msqkptr = NULL;
647 DPRINTF(("msgget(0x%x, 0%o)\n", key, msgflg));
649 if (msg_find_prison(cred) == NULL)
653 if (key != IPC_PRIVATE) {
654 for (msqid = 0; msqid < msginfo.msgmni; msqid++) {
655 msqkptr = &msqids[msqid];
656 if (msqkptr->u.msg_qbytes != 0 &&
657 msqkptr->cred != NULL &&
658 msqkptr->cred->cr_prison == cred->cr_prison &&
659 msqkptr->u.msg_perm.key == key)
662 if (msqid < msginfo.msgmni) {
663 DPRINTF(("found public key\n"));
664 if ((msgflg & IPC_CREAT) && (msgflg & IPC_EXCL)) {
665 DPRINTF(("not exclusive\n"));
669 AUDIT_ARG_SVIPC_ID(IXSEQ_TO_IPCID(msqid,
670 msqkptr->u.msg_perm));
671 if ((error = ipcperm(td, &msqkptr->u.msg_perm,
673 DPRINTF(("requester doesn't have 0%o access\n",
678 error = mac_sysvmsq_check_msqget(cred, msqkptr);
686 DPRINTF(("need to allocate the msqid_ds\n"));
687 if (key == IPC_PRIVATE || (msgflg & IPC_CREAT)) {
688 for (msqid = 0; msqid < msginfo.msgmni; msqid++) {
690 * Look for an unallocated and unlocked msqid_ds.
691 * msqid_ds's can be locked by msgsnd or msgrcv while
692 * they are copying the message in/out. We can't
693 * re-use the entry until they release it.
695 msqkptr = &msqids[msqid];
696 if (msqkptr->u.msg_qbytes == 0 &&
697 (msqkptr->u.msg_perm.mode & MSG_LOCKED) == 0)
700 if (msqid == msginfo.msgmni) {
701 DPRINTF(("no more msqid_ds's available\n"));
707 PROC_LOCK(td->td_proc);
708 error = racct_add(td->td_proc, RACCT_NMSGQ, 1);
709 PROC_UNLOCK(td->td_proc);
716 DPRINTF(("msqid %d is available\n", msqid));
717 msqkptr->u.msg_perm.key = key;
718 msqkptr->u.msg_perm.cuid = cred->cr_uid;
719 msqkptr->u.msg_perm.uid = cred->cr_uid;
720 msqkptr->u.msg_perm.cgid = cred->cr_gid;
721 msqkptr->u.msg_perm.gid = cred->cr_gid;
722 msqkptr->u.msg_perm.mode = (msgflg & 0777);
723 msqkptr->cred = crhold(cred);
724 /* Make sure that the returned msqid is unique */
725 msqkptr->u.msg_perm.seq = (msqkptr->u.msg_perm.seq + 1) & 0x7fff;
726 msqkptr->u.__msg_first = NULL;
727 msqkptr->u.__msg_last = NULL;
728 msqkptr->u.msg_cbytes = 0;
729 msqkptr->u.msg_qnum = 0;
730 msqkptr->u.msg_qbytes = msginfo.msgmnb;
731 msqkptr->u.msg_lspid = 0;
732 msqkptr->u.msg_lrpid = 0;
733 msqkptr->u.msg_stime = 0;
734 msqkptr->u.msg_rtime = 0;
735 msqkptr->u.msg_ctime = time_second;
737 mac_sysvmsq_create(cred, msqkptr);
739 AUDIT_ARG_SVIPC_PERM(&msqkptr->u.msg_perm);
741 DPRINTF(("didn't find it and wasn't asked to create it\n"));
747 /* Construct the unique msqid */
748 td->td_retval[0] = IXSEQ_TO_IPCID(msqid, msqkptr->u.msg_perm);
750 mtx_unlock(&msq_mtx);
754 #ifndef _SYS_SYSPROTO_H_
757 const void *msgp; /* XXX msgp is actually mtext. */
763 kern_msgsnd(struct thread *td, int msqid, const void *msgp,
764 size_t msgsz, int msgflg, long mtype)
766 int msqix, segs_needed, error = 0;
767 struct msqid_kernel *msqkptr;
772 size_t saved_msgsz = 0;
775 rpr = msg_find_prison(td->td_ucred);
780 AUDIT_ARG_SVIPC_ID(msqid);
781 msqix = IPCID_TO_IX(msqid);
783 if (msqix < 0 || msqix >= msginfo.msgmni) {
784 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix,
790 msqkptr = &msqids[msqix];
791 AUDIT_ARG_SVIPC_PERM(&msqkptr->u.msg_perm);
792 if (msqkptr->u.msg_qbytes == 0) {
793 DPRINTF(("no such message queue id\n"));
797 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) {
798 DPRINTF(("wrong sequence number\n"));
803 if ((error = msq_prison_cansee(rpr, msqkptr))) {
804 DPRINTF(("requester can't see prison\n"));
808 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_W))) {
809 DPRINTF(("requester doesn't have write access\n"));
814 error = mac_sysvmsq_check_msqsnd(td->td_ucred, msqkptr);
821 PROC_LOCK(td->td_proc);
822 if (racct_add(td->td_proc, RACCT_MSGQQUEUED, 1)) {
823 PROC_UNLOCK(td->td_proc);
828 if (racct_add(td->td_proc, RACCT_MSGQSIZE, msgsz)) {
829 racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1);
830 PROC_UNLOCK(td->td_proc);
834 PROC_UNLOCK(td->td_proc);
838 segs_needed = howmany(msgsz, msginfo.msgssz);
839 DPRINTF(("msgsz=%zu, msgssz=%d, segs_needed=%d\n", msgsz,
840 msginfo.msgssz, segs_needed));
842 int need_more_resources = 0;
846 * (inside this loop in case msg_qbytes changes while we sleep)
849 if (msgsz > msqkptr->u.msg_qbytes) {
850 DPRINTF(("msgsz > msqkptr->u.msg_qbytes\n"));
855 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) {
856 DPRINTF(("msqid is locked\n"));
857 need_more_resources = 1;
859 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) {
860 DPRINTF(("msgsz + msg_cbytes > msg_qbytes\n"));
861 need_more_resources = 1;
863 if (segs_needed > nfree_msgmaps) {
864 DPRINTF(("segs_needed > nfree_msgmaps\n"));
865 need_more_resources = 1;
867 if (free_msghdrs == NULL) {
868 DPRINTF(("no more msghdrs\n"));
869 need_more_resources = 1;
872 if (need_more_resources) {
875 if ((msgflg & IPC_NOWAIT) != 0) {
876 DPRINTF(("need more resources but caller "
877 "doesn't want to wait\n"));
882 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) {
883 DPRINTF(("we don't own the msqid_ds\n"));
886 /* Force later arrivals to wait for our
888 DPRINTF(("we own the msqid_ds\n"));
889 msqkptr->u.msg_perm.mode |= MSG_LOCKED;
892 DPRINTF(("msgsnd: goodnight\n"));
893 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH,
895 DPRINTF(("msgsnd: good morning, error=%d\n", error));
897 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED;
898 if (error == EWOULDBLOCK) {
899 DPRINTF(("msgsnd: timed out\n"));
903 DPRINTF(("msgsnd: interrupted system call\n"));
909 * Make sure that the msq queue still exists
912 if (msqkptr->u.msg_qbytes == 0) {
913 DPRINTF(("msqid deleted\n"));
919 DPRINTF(("got all the resources that we need\n"));
925 * We have the resources that we need.
929 if (msqkptr->u.msg_perm.mode & MSG_LOCKED)
930 panic("msg_perm.mode & MSG_LOCKED");
931 if (segs_needed > nfree_msgmaps)
932 panic("segs_needed > nfree_msgmaps");
933 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes)
934 panic("msgsz + msg_cbytes > msg_qbytes");
935 if (free_msghdrs == NULL)
936 panic("no more msghdrs");
939 * Re-lock the msqid_ds in case we page-fault when copying in the
943 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0)
944 panic("msqid_ds is already locked");
945 msqkptr->u.msg_perm.mode |= MSG_LOCKED;
948 * Allocate a message header
951 msghdr = free_msghdrs;
952 free_msghdrs = msghdr->msg_next;
953 msghdr->msg_spot = -1;
954 msghdr->msg_ts = msgsz;
955 msghdr->msg_type = mtype;
958 * XXXMAC: Should the mac_sysvmsq_check_msgmsq check follow here
959 * immediately? Or, should it be checked just before the msg is
960 * enqueued in the msgq (as it is done now)?
962 mac_sysvmsg_create(td->td_ucred, msqkptr, msghdr);
966 * Allocate space for the message
969 while (segs_needed > 0) {
970 if (nfree_msgmaps <= 0)
971 panic("not enough msgmaps");
972 if (free_msgmaps == -1)
973 panic("nil free_msgmaps");
976 panic("next too low #1");
977 if (next >= msginfo.msgseg)
978 panic("next out of range #1");
979 DPRINTF(("allocating segment %d to message\n", next));
980 free_msgmaps = msgmaps[next].next;
982 msgmaps[next].next = msghdr->msg_spot;
983 msghdr->msg_spot = next;
988 * Validate the message type
991 if (msghdr->msg_type < 1) {
993 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED;
995 DPRINTF(("mtype (%ld) < 1\n", msghdr->msg_type));
1001 * Copy in the message body
1004 next = msghdr->msg_spot;
1007 if (msgsz > msginfo.msgssz)
1008 tlen = msginfo.msgssz;
1012 panic("next too low #2");
1013 if (next >= msginfo.msgseg)
1014 panic("next out of range #2");
1015 mtx_unlock(&msq_mtx);
1016 if ((error = copyin(msgp, &msgpool[next * msginfo.msgssz],
1019 DPRINTF(("error %d copying in message segment\n",
1021 msg_freehdr(msghdr);
1022 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED;
1028 msgp = (const char *)msgp + tlen;
1029 next = msgmaps[next].next;
1032 panic("didn't use all the msg segments");
1035 * We've got the message. Unlock the msqid_ds.
1038 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED;
1041 * Make sure that the msqid_ds is still allocated.
1044 if (msqkptr->u.msg_qbytes == 0) {
1045 msg_freehdr(msghdr);
1053 * Note: Since the task/thread allocates the msghdr and usually
1054 * primes it with its own MAC label, for a majority of policies, it
1055 * won't be necessary to check whether the msghdr has access
1056 * permissions to the msgq. The mac_sysvmsq_check_msqsnd check would
1057 * suffice in that case. However, this hook may be required where
1058 * individual policies derive a non-identical label for the msghdr
1059 * from the current thread label and may want to check the msghdr
1060 * enqueue permissions, along with read/write permissions to the
1063 error = mac_sysvmsq_check_msgmsq(td->td_ucred, msghdr, msqkptr);
1065 msg_freehdr(msghdr);
1072 * Put the message into the queue
1074 if (msqkptr->u.__msg_first == NULL) {
1075 msqkptr->u.__msg_first = msghdr;
1076 msqkptr->u.__msg_last = msghdr;
1078 msqkptr->u.__msg_last->msg_next = msghdr;
1079 msqkptr->u.__msg_last = msghdr;
1081 msqkptr->u.__msg_last->msg_next = NULL;
1083 msqkptr->u.msg_cbytes += msghdr->msg_ts;
1084 msqkptr->u.msg_qnum++;
1085 msqkptr->u.msg_lspid = td->td_proc->p_pid;
1086 msqkptr->u.msg_stime = time_second;
1089 td->td_retval[0] = 0;
1092 if (racct_enable && error != 0) {
1093 PROC_LOCK(td->td_proc);
1094 racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1);
1095 racct_sub(td->td_proc, RACCT_MSGQSIZE, saved_msgsz);
1096 PROC_UNLOCK(td->td_proc);
1100 mtx_unlock(&msq_mtx);
1105 sys_msgsnd(struct thread *td, struct msgsnd_args *uap)
1110 DPRINTF(("call to msgsnd(%d, %p, %zu, %d)\n", uap->msqid, uap->msgp,
1111 uap->msgsz, uap->msgflg));
1113 if ((error = copyin(uap->msgp, &mtype, sizeof(mtype))) != 0) {
1114 DPRINTF(("error %d copying the message type\n", error));
1117 return (kern_msgsnd(td, uap->msqid,
1118 (const char *)uap->msgp + sizeof(mtype),
1119 uap->msgsz, uap->msgflg, mtype));
1122 #ifndef _SYS_SYSPROTO_H_
1123 struct msgrcv_args {
1131 /* XXX msgp is actually mtext. */
1133 kern_msgrcv(struct thread *td, int msqid, void *msgp, size_t msgsz, long msgtyp,
1134 int msgflg, long *mtype)
1137 struct msqid_kernel *msqkptr;
1140 int msqix, error = 0;
1143 rpr = msg_find_prison(td->td_ucred);
1147 AUDIT_ARG_SVIPC_ID(msqid);
1148 msqix = IPCID_TO_IX(msqid);
1150 if (msqix < 0 || msqix >= msginfo.msgmni) {
1151 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix,
1156 msqkptr = &msqids[msqix];
1158 AUDIT_ARG_SVIPC_PERM(&msqkptr->u.msg_perm);
1159 if (msqkptr->u.msg_qbytes == 0) {
1160 DPRINTF(("no such message queue id\n"));
1164 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) {
1165 DPRINTF(("wrong sequence number\n"));
1170 if ((error = msq_prison_cansee(rpr, msqkptr))) {
1171 DPRINTF(("requester can't see prison\n"));
1175 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) {
1176 DPRINTF(("requester doesn't have read access\n"));
1181 error = mac_sysvmsq_check_msqrcv(td->td_ucred, msqkptr);
1187 while (msghdr == NULL) {
1189 msghdr = msqkptr->u.__msg_first;
1190 if (msghdr != NULL) {
1191 if (msgsz < msghdr->msg_ts &&
1192 (msgflg & MSG_NOERROR) == 0) {
1193 DPRINTF(("first message on the queue "
1194 "is too big (want %zu, got %d)\n",
1195 msgsz, msghdr->msg_ts));
1200 error = mac_sysvmsq_check_msgrcv(td->td_ucred,
1205 if (msqkptr->u.__msg_first ==
1206 msqkptr->u.__msg_last) {
1207 msqkptr->u.__msg_first = NULL;
1208 msqkptr->u.__msg_last = NULL;
1210 msqkptr->u.__msg_first = msghdr->msg_next;
1211 if (msqkptr->u.__msg_first == NULL)
1212 panic("msg_first/last screwed up #1");
1216 struct msg *previous;
1220 prev = &(msqkptr->u.__msg_first);
1221 while ((msghdr = *prev) != NULL) {
1223 * Is this message's type an exact match or is
1224 * this message's type less than or equal to
1225 * the absolute value of a negative msgtyp?
1226 * Note that the second half of this test can
1227 * NEVER be true if msgtyp is positive since
1228 * msg_type is always positive!
1231 if (msgtyp == msghdr->msg_type ||
1232 msghdr->msg_type <= -msgtyp) {
1233 DPRINTF(("found message type %ld, "
1235 msghdr->msg_type, msgtyp));
1236 if (msgsz < msghdr->msg_ts &&
1237 (msgflg & MSG_NOERROR) == 0) {
1238 DPRINTF(("requested message "
1239 "on the queue is too big "
1240 "(want %zu, got %hu)\n",
1241 msgsz, msghdr->msg_ts));
1246 error = mac_sysvmsq_check_msgrcv(
1247 td->td_ucred, msghdr);
1251 *prev = msghdr->msg_next;
1252 if (msghdr == msqkptr->u.__msg_last) {
1253 if (previous == NULL) {
1255 &msqkptr->u.__msg_first)
1256 panic("__msg_first/last screwed up #2");
1257 msqkptr->u.__msg_first =
1259 msqkptr->u.__msg_last =
1263 &msqkptr->u.__msg_first)
1264 panic("__msg_first/last screwed up #3");
1265 msqkptr->u.__msg_last =
1272 prev = &(msghdr->msg_next);
1277 * We've either extracted the msghdr for the appropriate
1278 * message or there isn't one.
1279 * If there is one then bail out of this loop.
1286 * Hmph! No message found. Does the user want to wait?
1289 if ((msgflg & IPC_NOWAIT) != 0) {
1290 DPRINTF(("no appropriate message found (msgtyp=%ld)\n",
1292 /* The SVID says to return ENOMSG. */
1298 * Wait for something to happen
1301 DPRINTF(("msgrcv: goodnight\n"));
1302 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH,
1304 DPRINTF(("msgrcv: good morning (error=%d)\n", error));
1307 DPRINTF(("msgrcv: interrupted system call\n"));
1313 * Make sure that the msq queue still exists
1316 if (msqkptr->u.msg_qbytes == 0 ||
1317 msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) {
1318 DPRINTF(("msqid deleted\n"));
1325 * Return the message to the user.
1327 * First, do the bookkeeping (before we risk being interrupted).
1330 msqkptr->u.msg_cbytes -= msghdr->msg_ts;
1331 msqkptr->u.msg_qnum--;
1332 msqkptr->u.msg_lrpid = td->td_proc->p_pid;
1333 msqkptr->u.msg_rtime = time_second;
1335 racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, 1);
1336 racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msghdr->msg_ts);
1339 * Make msgsz the actual amount that we'll be returning.
1340 * Note that this effectively truncates the message if it is too long
1341 * (since msgsz is never increased).
1344 DPRINTF(("found a message, msgsz=%zu, msg_ts=%hu\n", msgsz,
1346 if (msgsz > msghdr->msg_ts)
1347 msgsz = msghdr->msg_ts;
1348 *mtype = msghdr->msg_type;
1351 * Return the segments to the user
1354 next = msghdr->msg_spot;
1355 for (len = 0; len < msgsz; len += msginfo.msgssz) {
1358 if (msgsz - len > msginfo.msgssz)
1359 tlen = msginfo.msgssz;
1363 panic("next too low #3");
1364 if (next >= msginfo.msgseg)
1365 panic("next out of range #3");
1366 mtx_unlock(&msq_mtx);
1367 error = copyout(&msgpool[next * msginfo.msgssz], msgp, tlen);
1370 DPRINTF(("error (%d) copying out message segment\n",
1372 msg_freehdr(msghdr);
1376 msgp = (char *)msgp + tlen;
1377 next = msgmaps[next].next;
1381 * Done, return the actual number of bytes copied out.
1384 msg_freehdr(msghdr);
1386 td->td_retval[0] = msgsz;
1388 mtx_unlock(&msq_mtx);
1393 sys_msgrcv(struct thread *td, struct msgrcv_args *uap)
1398 DPRINTF(("call to msgrcv(%d, %p, %zu, %ld, %d)\n", uap->msqid,
1399 uap->msgp, uap->msgsz, uap->msgtyp, uap->msgflg));
1401 if ((error = kern_msgrcv(td, uap->msqid,
1402 (char *)uap->msgp + sizeof(mtype), uap->msgsz,
1403 uap->msgtyp, uap->msgflg, &mtype)) != 0)
1405 if ((error = copyout(&mtype, uap->msgp, sizeof(mtype))) != 0)
1406 DPRINTF(("error %d copying the message type\n", error));
1411 sysctl_msqids(SYSCTL_HANDLER_ARGS)
1413 struct msqid_kernel tmsqk;
1414 #ifdef COMPAT_FREEBSD32
1415 struct msqid_kernel32 tmsqk32;
1417 struct prison *pr, *rpr;
1422 pr = req->td->td_ucred->cr_prison;
1423 rpr = msg_find_prison(req->td->td_ucred);
1425 for (i = 0; i < msginfo.msgmni; i++) {
1427 if (msqids[i].u.msg_qbytes == 0 || rpr == NULL ||
1428 msq_prison_cansee(rpr, &msqids[i]) != 0)
1429 bzero(&tmsqk, sizeof(tmsqk));
1432 if (tmsqk.cred->cr_prison != pr)
1433 tmsqk.u.msg_perm.key = IPC_PRIVATE;
1435 mtx_unlock(&msq_mtx);
1436 #ifdef COMPAT_FREEBSD32
1437 if (SV_CURPROC_FLAG(SV_ILP32)) {
1438 bzero(&tmsqk32, sizeof(tmsqk32));
1439 freebsd32_ipcperm_out(&tmsqk.u.msg_perm,
1440 &tmsqk32.u.msg_perm);
1441 /* Don't copy u.msg_first or u.msg_last */
1442 CP(tmsqk, tmsqk32, u.msg_cbytes);
1443 CP(tmsqk, tmsqk32, u.msg_qnum);
1444 CP(tmsqk, tmsqk32, u.msg_qbytes);
1445 CP(tmsqk, tmsqk32, u.msg_lspid);
1446 CP(tmsqk, tmsqk32, u.msg_lrpid);
1447 CP(tmsqk, tmsqk32, u.msg_stime);
1448 CP(tmsqk, tmsqk32, u.msg_rtime);
1449 CP(tmsqk, tmsqk32, u.msg_ctime);
1450 /* Don't copy label or cred */
1452 outsize = sizeof(tmsqk32);
1456 /* Don't leak kernel pointers */
1457 tmsqk.u.__msg_first = NULL;
1458 tmsqk.u.__msg_last = NULL;
1462 * XXX: some padding also exists, but we take care to
1463 * allocate our pool of msqid_kernel structs with
1464 * zeroed memory so this should be OK.
1467 outsize = sizeof(tmsqk);
1469 error = SYSCTL_OUT(req, outaddr, outsize);
1476 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmax, CTLFLAG_RD, &msginfo.msgmax, 0,
1477 "Maximum message size");
1478 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmni, CTLFLAG_RDTUN, &msginfo.msgmni, 0,
1479 "Number of message queue identifiers");
1480 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmnb, CTLFLAG_RDTUN, &msginfo.msgmnb, 0,
1481 "Maximum number of bytes in a queue");
1482 SYSCTL_INT(_kern_ipc, OID_AUTO, msgtql, CTLFLAG_RDTUN, &msginfo.msgtql, 0,
1483 "Maximum number of messages in the system");
1484 SYSCTL_INT(_kern_ipc, OID_AUTO, msgssz, CTLFLAG_RDTUN, &msginfo.msgssz, 0,
1485 "Size of a message segment");
1486 SYSCTL_INT(_kern_ipc, OID_AUTO, msgseg, CTLFLAG_RDTUN, &msginfo.msgseg, 0,
1487 "Number of message segments");
1488 SYSCTL_PROC(_kern_ipc, OID_AUTO, msqids,
1489 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE,
1490 NULL, 0, sysctl_msqids, "",
1491 "Array of struct msqid_kernel for each potential message queue");
1494 msg_prison_check(void *obj, void *data)
1496 struct prison *pr = obj;
1497 struct prison *prpr;
1498 struct vfsoptlist *opts = data;
1502 * sysvmsg is a jailsys integer.
1503 * It must be "disable" if the parent jail is disabled.
1505 error = vfs_copyopt(opts, "sysvmsg", &jsys, sizeof(jsys));
1506 if (error != ENOENT) {
1510 case JAIL_SYS_DISABLE:
1513 case JAIL_SYS_INHERIT:
1514 prison_lock(pr->pr_parent);
1515 prpr = osd_jail_get(pr->pr_parent, msg_prison_slot);
1516 prison_unlock(pr->pr_parent);
1529 msg_prison_set(void *obj, void *data)
1531 struct prison *pr = obj;
1532 struct prison *tpr, *orpr, *nrpr, *trpr;
1533 struct vfsoptlist *opts = data;
1538 * sysvmsg controls which jail is the root of the associated msgs (this
1539 * jail or same as the parent), or if the feature is available at all.
1541 if (vfs_copyopt(opts, "sysvmsg", &jsys, sizeof(jsys)) == ENOENT)
1542 jsys = vfs_flagopt(opts, "allow.sysvipc", NULL, 0)
1544 : vfs_flagopt(opts, "allow.nosysvipc", NULL, 0)
1547 if (jsys == JAIL_SYS_DISABLE) {
1549 orpr = osd_jail_get(pr, msg_prison_slot);
1551 osd_jail_del(pr, msg_prison_slot);
1555 msg_prison_cleanup(pr);
1556 /* Disable all child jails as well. */
1557 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1559 trpr = osd_jail_get(tpr, msg_prison_slot);
1561 osd_jail_del(tpr, msg_prison_slot);
1564 msg_prison_cleanup(tpr);
1571 } else if (jsys != -1) {
1572 if (jsys == JAIL_SYS_NEW)
1575 prison_lock(pr->pr_parent);
1576 nrpr = osd_jail_get(pr->pr_parent, msg_prison_slot);
1577 prison_unlock(pr->pr_parent);
1579 rsv = osd_reserve(msg_prison_slot);
1581 orpr = osd_jail_get(pr, msg_prison_slot);
1583 (void)osd_jail_set_reserved(pr, msg_prison_slot, rsv,
1586 osd_free_reserved(rsv);
1590 msg_prison_cleanup(pr);
1592 /* Change child jails matching the old root, */
1593 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1595 trpr = osd_jail_get(tpr,
1598 (void)osd_jail_set(tpr,
1599 msg_prison_slot, nrpr);
1602 msg_prison_cleanup(tpr);
1616 msg_prison_get(void *obj, void *data)
1618 struct prison *pr = obj;
1620 struct vfsoptlist *opts = data;
1623 /* Set sysvmsg based on the jail's root prison. */
1625 rpr = osd_jail_get(pr, msg_prison_slot);
1627 jsys = rpr == NULL ? JAIL_SYS_DISABLE
1628 : rpr == pr ? JAIL_SYS_NEW : JAIL_SYS_INHERIT;
1629 error = vfs_setopt(opts, "sysvmsg", &jsys, sizeof(jsys));
1630 if (error == ENOENT)
1636 msg_prison_remove(void *obj, void *data __unused)
1638 struct prison *pr = obj;
1642 rpr = osd_jail_get(pr, msg_prison_slot);
1645 msg_prison_cleanup(pr);
1650 msg_prison_cleanup(struct prison *pr)
1652 struct msqid_kernel *msqkptr;
1655 /* Remove any msqs that belong to this jail. */
1657 for (i = 0; i < msginfo.msgmni; i++) {
1658 msqkptr = &msqids[i];
1659 if (msqkptr->u.msg_qbytes != 0 &&
1660 msqkptr->cred != NULL && msqkptr->cred->cr_prison == pr)
1661 msq_remove(msqkptr);
1663 mtx_unlock(&msq_mtx);
1666 SYSCTL_JAIL_PARAM_SYS_NODE(sysvmsg, CTLFLAG_RW, "SYSV message queues");
1668 #ifdef COMPAT_FREEBSD32
1670 freebsd32_msgsys(struct thread *td, struct freebsd32_msgsys_args *uap)
1673 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1674 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1675 AUDIT_ARG_SVIPC_WHICH(uap->which);
1676 switch (uap->which) {
1678 return (freebsd7_freebsd32_msgctl(td,
1679 (struct freebsd7_freebsd32_msgctl_args *)&uap->a2));
1681 return (freebsd32_msgsnd(td,
1682 (struct freebsd32_msgsnd_args *)&uap->a2));
1684 return (freebsd32_msgrcv(td,
1685 (struct freebsd32_msgrcv_args *)&uap->a2));
1687 return (sys_msgsys(td, (struct msgsys_args *)uap));
1690 return (nosys(td, NULL));
1694 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1695 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1697 freebsd7_freebsd32_msgctl(struct thread *td,
1698 struct freebsd7_freebsd32_msgctl_args *uap)
1700 struct msqid_ds msqbuf;
1701 struct msqid_ds32_old msqbuf32;
1704 if (uap->cmd == IPC_SET) {
1705 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32));
1708 freebsd32_ipcperm_old_in(&msqbuf32.msg_perm, &msqbuf.msg_perm);
1709 PTRIN_CP(msqbuf32, msqbuf, __msg_first);
1710 PTRIN_CP(msqbuf32, msqbuf, __msg_last);
1711 CP(msqbuf32, msqbuf, msg_cbytes);
1712 CP(msqbuf32, msqbuf, msg_qnum);
1713 CP(msqbuf32, msqbuf, msg_qbytes);
1714 CP(msqbuf32, msqbuf, msg_lspid);
1715 CP(msqbuf32, msqbuf, msg_lrpid);
1716 CP(msqbuf32, msqbuf, msg_stime);
1717 CP(msqbuf32, msqbuf, msg_rtime);
1718 CP(msqbuf32, msqbuf, msg_ctime);
1720 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf);
1723 if (uap->cmd == IPC_STAT) {
1724 bzero(&msqbuf32, sizeof(msqbuf32));
1725 freebsd32_ipcperm_old_out(&msqbuf.msg_perm, &msqbuf32.msg_perm);
1726 PTROUT_CP(msqbuf, msqbuf32, __msg_first);
1727 PTROUT_CP(msqbuf, msqbuf32, __msg_last);
1728 CP(msqbuf, msqbuf32, msg_cbytes);
1729 CP(msqbuf, msqbuf32, msg_qnum);
1730 CP(msqbuf, msqbuf32, msg_qbytes);
1731 CP(msqbuf, msqbuf32, msg_lspid);
1732 CP(msqbuf, msqbuf32, msg_lrpid);
1733 CP(msqbuf, msqbuf32, msg_stime);
1734 CP(msqbuf, msqbuf32, msg_rtime);
1735 CP(msqbuf, msqbuf32, msg_ctime);
1736 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32));
1743 freebsd32_msgctl(struct thread *td, struct freebsd32_msgctl_args *uap)
1745 struct msqid_ds msqbuf;
1746 struct msqid_ds32 msqbuf32;
1749 if (uap->cmd == IPC_SET) {
1750 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32));
1753 freebsd32_ipcperm_in(&msqbuf32.msg_perm, &msqbuf.msg_perm);
1754 PTRIN_CP(msqbuf32, msqbuf, __msg_first);
1755 PTRIN_CP(msqbuf32, msqbuf, __msg_last);
1756 CP(msqbuf32, msqbuf, msg_cbytes);
1757 CP(msqbuf32, msqbuf, msg_qnum);
1758 CP(msqbuf32, msqbuf, msg_qbytes);
1759 CP(msqbuf32, msqbuf, msg_lspid);
1760 CP(msqbuf32, msqbuf, msg_lrpid);
1761 CP(msqbuf32, msqbuf, msg_stime);
1762 CP(msqbuf32, msqbuf, msg_rtime);
1763 CP(msqbuf32, msqbuf, msg_ctime);
1765 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf);
1768 if (uap->cmd == IPC_STAT) {
1769 freebsd32_ipcperm_out(&msqbuf.msg_perm, &msqbuf32.msg_perm);
1770 PTROUT_CP(msqbuf, msqbuf32, __msg_first);
1771 PTROUT_CP(msqbuf, msqbuf32, __msg_last);
1772 CP(msqbuf, msqbuf32, msg_cbytes);
1773 CP(msqbuf, msqbuf32, msg_qnum);
1774 CP(msqbuf, msqbuf32, msg_qbytes);
1775 CP(msqbuf, msqbuf32, msg_lspid);
1776 CP(msqbuf, msqbuf32, msg_lrpid);
1777 CP(msqbuf, msqbuf32, msg_stime);
1778 CP(msqbuf, msqbuf32, msg_rtime);
1779 CP(msqbuf, msqbuf32, msg_ctime);
1780 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32));
1786 freebsd32_msgsnd(struct thread *td, struct freebsd32_msgsnd_args *uap)
1793 msgp = PTRIN(uap->msgp);
1794 if ((error = copyin(msgp, &mtype32, sizeof(mtype32))) != 0)
1797 return (kern_msgsnd(td, uap->msqid,
1798 (const char *)msgp + sizeof(mtype32),
1799 uap->msgsz, uap->msgflg, mtype));
1803 freebsd32_msgrcv(struct thread *td, struct freebsd32_msgrcv_args *uap)
1810 msgp = PTRIN(uap->msgp);
1811 if ((error = kern_msgrcv(td, uap->msqid,
1812 (char *)msgp + sizeof(mtype32), uap->msgsz,
1813 uap->msgtyp, uap->msgflg, &mtype)) != 0)
1815 mtype32 = (int32_t)mtype;
1816 return (copyout(&mtype32, msgp, sizeof(mtype32)));
1820 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1821 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1823 /* XXX casting to (sy_call_t *) is bogus, as usual. */
1824 static sy_call_t *msgcalls[] = {
1825 (sy_call_t *)freebsd7_msgctl, (sy_call_t *)sys_msgget,
1826 (sy_call_t *)sys_msgsnd, (sy_call_t *)sys_msgrcv
1830 * Entry point for all MSG calls.
1832 * XXX actually varargs.
1833 * struct msgsys_args {
1843 sys_msgsys(struct thread *td, struct msgsys_args *uap)
1847 AUDIT_ARG_SVIPC_WHICH(uap->which);
1848 if (uap->which < 0 || uap->which >= nitems(msgcalls))
1850 error = (*msgcalls[uap->which])(td, &uap->a2);
1855 #define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0)
1858 #ifndef _SYS_SYSPROTO_H_
1859 struct freebsd7_msgctl_args {
1862 struct msqid_ds_old *buf;
1866 freebsd7_msgctl(struct thread *td, struct freebsd7_msgctl_args *uap)
1868 struct msqid_ds_old msqold;
1869 struct msqid_ds msqbuf;
1872 DPRINTF(("call to freebsd7_msgctl(%d, %d, %p)\n", uap->msqid, uap->cmd,
1874 if (uap->cmd == IPC_SET) {
1875 error = copyin(uap->buf, &msqold, sizeof(msqold));
1878 ipcperm_old2new(&msqold.msg_perm, &msqbuf.msg_perm);
1879 CP(msqold, msqbuf, __msg_first);
1880 CP(msqold, msqbuf, __msg_last);
1881 CP(msqold, msqbuf, msg_cbytes);
1882 CP(msqold, msqbuf, msg_qnum);
1883 CP(msqold, msqbuf, msg_qbytes);
1884 CP(msqold, msqbuf, msg_lspid);
1885 CP(msqold, msqbuf, msg_lrpid);
1886 CP(msqold, msqbuf, msg_stime);
1887 CP(msqold, msqbuf, msg_rtime);
1888 CP(msqold, msqbuf, msg_ctime);
1890 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf);
1893 if (uap->cmd == IPC_STAT) {
1894 bzero(&msqold, sizeof(msqold));
1895 ipcperm_new2old(&msqbuf.msg_perm, &msqold.msg_perm);
1896 CP(msqbuf, msqold, __msg_first);
1897 CP(msqbuf, msqold, __msg_last);
1898 CP(msqbuf, msqold, msg_cbytes);
1899 CP(msqbuf, msqold, msg_qnum);
1900 CP(msqbuf, msqold, msg_qbytes);
1901 CP(msqbuf, msqold, msg_lspid);
1902 CP(msqbuf, msqold, msg_lrpid);
1903 CP(msqbuf, msqold, msg_stime);
1904 CP(msqbuf, msqold, msg_rtime);
1905 CP(msqbuf, msqold, msg_ctime);
1906 error = copyout(&msqold, uap->buf, sizeof(struct msqid_ds_old));
1913 #endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 ||