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 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 21 * 22 * Copyright (c) 2003-2005 McAfee, Inc. 23 * Copyright (c) 2016-2017 Robert N. M. Watson 24 * All rights reserved. 25 * 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 29 * program. 30 * 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. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 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. 44 * 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 55 * SUCH DAMAGE. 56 */ 57 58 #include <sys/cdefs.h> 59 __FBSDID("$FreeBSD$"); 60 61 #include "opt_sysvipc.h" 62 63 #include <sys/param.h> 64 #include <sys/systm.h> 65 #include <sys/sysproto.h> 66 #include <sys/kernel.h> 67 #include <sys/priv.h> 68 #include <sys/proc.h> 69 #include <sys/lock.h> 70 #include <sys/mutex.h> 71 #include <sys/module.h> 72 #include <sys/mount.h> 73 #include <sys/msg.h> 74 #include <sys/racct.h> 75 #include <sys/sx.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> 81 #include <sys/jail.h> 82 83 #include <security/audit/audit.h> 84 #include <security/mac/mac_framework.h> 85 86 FEATURE(sysv_msg, "System V message queues support"); 87 88 static MALLOC_DEFINE(M_MSG, "msg", "SVID compatible message queues"); 89 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 *); 101 102 #ifdef MSG_DEBUG 103 #define DPRINTF(a) printf a 104 #else 105 #define DPRINTF(a) (void)0 106 #endif 107 108 static void msg_freehdr(struct msg *msghdr); 109 110 #ifndef MSGSSZ 111 #define MSGSSZ 8 /* Each segment must be 2^N long */ 112 #endif 113 #ifndef MSGSEG 114 #define MSGSEG 2048 /* must be less than 32767 */ 115 #endif 116 #define MSGMAX (MSGSSZ*MSGSEG) 117 #ifndef MSGMNB 118 #define MSGMNB 2048 /* max # of bytes in a queue */ 119 #endif 120 #ifndef MSGMNI 121 #define MSGMNI 40 122 #endif 123 #ifndef MSGTQL 124 #define MSGTQL 40 125 #endif 126 127 /* 128 * Based on the configuration parameters described in an SVR2 (yes, two) 129 * config(1m) man page. 130 * 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). 136 */ 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 */ 145 }; 146 147 /* 148 * macros to convert between msqid_ds's and msqid's. 149 * (specific to this implementation) 150 */ 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) 154 155 /* 156 * The rest of this file is specific to this particular implementation. 157 */ 158 159 struct msgmap { 160 short next; /* next segment in buffer */ 161 /* -1 -> available */ 162 /* 0..(MSGSEG-1) -> index of next segment */ 163 }; 164 165 #define MSG_LOCKED 01000 /* Is this msqid_ds locked? */ 166 167 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 */ 176 177 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), 186 #endif 187 SYSCALL_INIT_LAST 188 }; 189 190 #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> 197 198 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), 207 #endif 208 SYSCALL_INIT_LAST 209 }; 210 #endif 211 212 static int 213 msginit() 214 { 215 struct prison *pr; 216 void **rsv; 217 int i, error; 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, 223 }; 224 225 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, 230 M_WAITOK | M_ZERO); 231 232 /* 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 ... 236 */ 237 238 i = 8; 239 while (i < 1024 && i != msginfo.msgssz) 240 i <<= 1; 241 if (i != msginfo.msgssz) { 242 DPRINTF(("msginfo.msgssz=%d (0x%x)\n", msginfo.msgssz, 243 msginfo.msgssz)); 244 panic("msginfo.msgssz not a small power of 2"); 245 } 246 247 if (msginfo.msgseg > 32767) { 248 DPRINTF(("msginfo.msgseg=%d\n", msginfo.msgseg)); 249 panic("msginfo.msgseg > 32767"); 250 } 251 252 for (i = 0; i < msginfo.msgseg; i++) { 253 if (i > 0) 254 msgmaps[i-1].next = i; 255 msgmaps[i].next = -1; /* implies entry is available */ 256 } 257 free_msgmaps = 0; 258 nfree_msgmaps = msginfo.msgseg; 259 260 for (i = 0; i < msginfo.msgtql; i++) { 261 msghdrs[i].msg_type = 0; 262 if (i > 0) 263 msghdrs[i-1].msg_next = &msghdrs[i]; 264 msghdrs[i].msg_next = NULL; 265 #ifdef MAC 266 mac_sysvmsg_init(&msghdrs[i]); 267 #endif 268 } 269 free_msghdrs = &msghdrs[0]; 270 271 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; 275 #ifdef MAC 276 mac_sysvmsq_init(&msqids[i]); 277 #endif 278 } 279 mtx_init(&msq_mtx, "msq", NULL, MTX_DEF); 280 281 /* 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); 287 rsv = NULL; 288 sx_slock(&allprison_lock); 289 TAILQ_FOREACH(pr, &allprison, pr_list) { 290 if (rsv == NULL) 291 rsv = osd_reserve(msg_prison_slot); 292 prison_lock(pr); 293 if ((pr->pr_allow & PR_ALLOW_SYSVIPC) && pr->pr_ref > 0) { 294 (void)osd_jail_set_reserved(pr, msg_prison_slot, rsv, 295 &prison0); 296 rsv = NULL; 297 } 298 prison_unlock(pr); 299 } 300 if (rsv != NULL) 301 osd_free_reserved(rsv); 302 sx_sunlock(&allprison_lock); 303 304 error = syscall_helper_register(msg_syscalls, SY_THR_STATIC_KLD); 305 if (error != 0) 306 return (error); 307 #ifdef COMPAT_FREEBSD32 308 error = syscall32_helper_register(msg32_syscalls, SY_THR_STATIC_KLD); 309 if (error != 0) 310 return (error); 311 #endif 312 return (0); 313 } 314 315 static int 316 msgunload() 317 { 318 struct msqid_kernel *msqkptr; 319 int msqid; 320 #ifdef MAC 321 int i; 322 #endif 323 324 syscall_helper_unregister(msg_syscalls); 325 #ifdef COMPAT_FREEBSD32 326 syscall32_helper_unregister(msg32_syscalls); 327 #endif 328 329 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) 333 break; 334 } 335 if (msqid != msginfo.msgmni) 336 return (EBUSY); 337 338 if (msg_prison_slot != 0) 339 osd_jail_deregister(msg_prison_slot); 340 #ifdef MAC 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]); 345 #endif 346 free(msgpool, M_MSG); 347 free(msgmaps, M_MSG); 348 free(msghdrs, M_MSG); 349 free(msqids, M_MSG); 350 mtx_destroy(&msq_mtx); 351 return (0); 352 } 353 354 static int 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 387 msg_freehdr(struct msg *msghdr) 388 { 389 while (msghdr->msg_ts > 0) { 390 short next; 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; 396 nfree_msgmaps++; 397 msghdr->msg_spot = next; 398 if (msghdr->msg_ts >= msginfo.msgssz) 399 msghdr->msg_ts -= msginfo.msgssz; 400 else 401 msghdr->msg_ts = 0; 402 } 403 if (msghdr->msg_spot != -1) 404 panic("msghdr->msg_spot != -1"); 405 msghdr->msg_next = free_msghdrs; 406 free_msghdrs = msghdr; 407 #ifdef MAC 408 mac_sysvmsg_cleanup(msghdr); 409 #endif 410 } 411 412 static void 413 msq_remove(struct msqid_kernel *msqkptr) 414 { 415 struct msg *msghdr; 416 417 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; 422 423 /* Free the message headers */ 424 msghdr = msqkptr->u.__msg_first; 425 while (msghdr != NULL) { 426 struct msg *msghdr_tmp; 427 428 /* Free the segments of each message */ 429 msqkptr->u.msg_cbytes -= msghdr->msg_ts; 430 msqkptr->u.msg_qnum--; 431 msghdr_tmp = msghdr; 432 msghdr = msghdr->msg_next; 433 msg_freehdr(msghdr_tmp); 434 } 435 436 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"); 440 441 msqkptr->u.msg_qbytes = 0; /* Mark it as free */ 442 443 #ifdef MAC 444 mac_sysvmsq_cleanup(msqkptr); 445 #endif 446 447 wakeup(msqkptr); 448 } 449 450 static struct prison * 451 msg_find_prison(struct ucred *cred) 452 { 453 struct prison *pr, *rpr; 454 455 pr = cred->cr_prison; 456 prison_lock(pr); 457 rpr = osd_jail_get(pr, msg_prison_slot); 458 prison_unlock(pr); 459 return rpr; 460 } 461 462 static int 463 msq_prison_cansee(struct prison *rpr, struct msqid_kernel *msqkptr) 464 { 465 466 if (msqkptr->cred == NULL || 467 !(rpr == msqkptr->cred->cr_prison || 468 prison_ischild(rpr, msqkptr->cred->cr_prison))) 469 return (EINVAL); 470 return (0); 471 } 472 473 #ifndef _SYS_SYSPROTO_H_ 474 struct msgctl_args { 475 int msqid; 476 int cmd; 477 struct msqid_ds *buf; 478 }; 479 #endif 480 int 481 sys_msgctl(struct thread *td, struct msgctl_args *uap) 482 { 483 int msqid = uap->msqid; 484 int cmd = uap->cmd; 485 struct msqid_ds msqbuf; 486 int error; 487 488 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) 491 return (error); 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)); 495 return (error); 496 } 497 498 int 499 kern_msgctl(struct thread *td, int msqid, int cmd, struct msqid_ds *msqbuf) 500 { 501 int rval, error, msqix; 502 struct msqid_kernel *msqkptr; 503 struct prison *rpr; 504 505 rpr = msg_find_prison(td->td_ucred); 506 if (rpr == NULL) 507 return (ENOSYS); 508 509 AUDIT_ARG_SVIPC_CMD(cmd); 510 AUDIT_ARG_SVIPC_ID(msqid); 511 msqix = IPCID_TO_IX(msqid); 512 513 if (msqix < 0 || msqix >= msginfo.msgmni) { 514 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 515 msginfo.msgmni)); 516 return (EINVAL); 517 } 518 519 msqkptr = &msqids[msqix]; 520 521 mtx_lock(&msq_mtx); 522 if (msqkptr->u.msg_qbytes == 0) { 523 DPRINTF(("no such msqid\n")); 524 error = EINVAL; 525 goto done2; 526 } 527 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 528 DPRINTF(("wrong sequence number\n")); 529 error = EINVAL; 530 goto done2; 531 } 532 533 error = msq_prison_cansee(rpr, msqkptr); 534 if (error != 0) { 535 DPRINTF(("requester can't see prison\n")); 536 goto done2; 537 } 538 539 #ifdef MAC 540 error = mac_sysvmsq_check_msqctl(td->td_ucred, msqkptr, cmd); 541 if (error != 0) 542 goto done2; 543 #endif 544 545 error = 0; 546 rval = 0; 547 548 switch (cmd) { 549 550 case IPC_RMID: 551 { 552 #ifdef MAC 553 struct msg *msghdr; 554 #endif 555 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M))) 556 goto done2; 557 558 #ifdef MAC 559 /* 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. 567 */ 568 for (msghdr = msqkptr->u.__msg_first; msghdr != NULL; 569 msghdr = msghdr->msg_next) { 570 error = mac_sysvmsq_check_msgrmid(td->td_ucred, msghdr); 571 if (error != 0) 572 goto done2; 573 } 574 #endif 575 576 msq_remove(msqkptr); 577 } 578 579 break; 580 581 case IPC_SET: 582 AUDIT_ARG_SVIPC_PERM(&msqbuf->msg_perm); 583 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M))) 584 goto done2; 585 if (msqbuf->msg_qbytes > msqkptr->u.msg_qbytes) { 586 error = priv_check(td, PRIV_IPC_MSGSIZE); 587 if (error) 588 goto done2; 589 } 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 */ 594 } 595 if (msqbuf->msg_qbytes == 0) { 596 DPRINTF(("can't reduce msg_qbytes to 0\n")); 597 error = EINVAL; /* non-standard errno! */ 598 goto done2; 599 } 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; 606 break; 607 608 case IPC_STAT: 609 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) { 610 DPRINTF(("requester doesn't have read access\n")); 611 goto done2; 612 } 613 *msqbuf = msqkptr->u; 614 if (td->td_ucred->cr_prison != msqkptr->cred->cr_prison) 615 msqbuf->msg_perm.key = IPC_PRIVATE; 616 break; 617 618 default: 619 DPRINTF(("invalid command %d\n", cmd)); 620 error = EINVAL; 621 goto done2; 622 } 623 624 if (error == 0) 625 td->td_retval[0] = rval; 626 done2: 627 mtx_unlock(&msq_mtx); 628 return (error); 629 } 630 631 #ifndef _SYS_SYSPROTO_H_ 632 struct msgget_args { 633 key_t key; 634 int msgflg; 635 }; 636 #endif 637 638 int 639 sys_msgget(struct thread *td, struct msgget_args *uap) 640 { 641 int msqid, error = 0; 642 int key = uap->key; 643 int msgflg = uap->msgflg; 644 struct ucred *cred = td->td_ucred; 645 struct msqid_kernel *msqkptr = NULL; 646 647 DPRINTF(("msgget(0x%x, 0%o)\n", key, msgflg)); 648 649 if (msg_find_prison(cred) == NULL) 650 return (ENOSYS); 651 652 mtx_lock(&msq_mtx); 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) 660 break; 661 } 662 if (msqid < msginfo.msgmni) { 663 DPRINTF(("found public key\n")); 664 if ((msgflg & IPC_CREAT) && (msgflg & IPC_EXCL)) { 665 DPRINTF(("not exclusive\n")); 666 error = EEXIST; 667 goto done2; 668 } 669 AUDIT_ARG_SVIPC_ID(IXSEQ_TO_IPCID(msqid, 670 msqkptr->u.msg_perm)); 671 if ((error = ipcperm(td, &msqkptr->u.msg_perm, 672 msgflg & 0700))) { 673 DPRINTF(("requester doesn't have 0%o access\n", 674 msgflg & 0700)); 675 goto done2; 676 } 677 #ifdef MAC 678 error = mac_sysvmsq_check_msqget(cred, msqkptr); 679 if (error != 0) 680 goto done2; 681 #endif 682 goto found; 683 } 684 } 685 686 DPRINTF(("need to allocate the msqid_ds\n")); 687 if (key == IPC_PRIVATE || (msgflg & IPC_CREAT)) { 688 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 689 /* 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. 694 */ 695 msqkptr = &msqids[msqid]; 696 if (msqkptr->u.msg_qbytes == 0 && 697 (msqkptr->u.msg_perm.mode & MSG_LOCKED) == 0) 698 break; 699 } 700 if (msqid == msginfo.msgmni) { 701 DPRINTF(("no more msqid_ds's available\n")); 702 error = ENOSPC; 703 goto done2; 704 } 705 #ifdef RACCT 706 if (racct_enable) { 707 PROC_LOCK(td->td_proc); 708 error = racct_add(td->td_proc, RACCT_NMSGQ, 1); 709 PROC_UNLOCK(td->td_proc); 710 if (error != 0) { 711 error = ENOSPC; 712 goto done2; 713 } 714 } 715 #endif 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; 736 #ifdef MAC 737 mac_sysvmsq_create(cred, msqkptr); 738 #endif 739 AUDIT_ARG_SVIPC_PERM(&msqkptr->u.msg_perm); 740 } else { 741 DPRINTF(("didn't find it and wasn't asked to create it\n")); 742 error = ENOENT; 743 goto done2; 744 } 745 746 found: 747 /* Construct the unique msqid */ 748 td->td_retval[0] = IXSEQ_TO_IPCID(msqid, msqkptr->u.msg_perm); 749 done2: 750 mtx_unlock(&msq_mtx); 751 return (error); 752 } 753 754 #ifndef _SYS_SYSPROTO_H_ 755 struct msgsnd_args { 756 int msqid; 757 const void *msgp; /* XXX msgp is actually mtext. */ 758 size_t msgsz; 759 int msgflg; 760 }; 761 #endif 762 int 763 kern_msgsnd(struct thread *td, int msqid, const void *msgp, 764 size_t msgsz, int msgflg, long mtype) 765 { 766 int msqix, segs_needed, error = 0; 767 struct msqid_kernel *msqkptr; 768 struct msg *msghdr; 769 struct prison *rpr; 770 short next; 771 #ifdef RACCT 772 size_t saved_msgsz = 0; 773 #endif 774 775 rpr = msg_find_prison(td->td_ucred); 776 if (rpr == NULL) 777 return (ENOSYS); 778 779 mtx_lock(&msq_mtx); 780 AUDIT_ARG_SVIPC_ID(msqid); 781 msqix = IPCID_TO_IX(msqid); 782 783 if (msqix < 0 || msqix >= msginfo.msgmni) { 784 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 785 msginfo.msgmni)); 786 error = EINVAL; 787 goto done2; 788 } 789 790 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")); 794 error = EINVAL; 795 goto done2; 796 } 797 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 798 DPRINTF(("wrong sequence number\n")); 799 error = EINVAL; 800 goto done2; 801 } 802 803 if ((error = msq_prison_cansee(rpr, msqkptr))) { 804 DPRINTF(("requester can't see prison\n")); 805 goto done2; 806 } 807 808 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_W))) { 809 DPRINTF(("requester doesn't have write access\n")); 810 goto done2; 811 } 812 813 #ifdef MAC 814 error = mac_sysvmsq_check_msqsnd(td->td_ucred, msqkptr); 815 if (error != 0) 816 goto done2; 817 #endif 818 819 #ifdef RACCT 820 if (racct_enable) { 821 PROC_LOCK(td->td_proc); 822 if (racct_add(td->td_proc, RACCT_MSGQQUEUED, 1)) { 823 PROC_UNLOCK(td->td_proc); 824 error = EAGAIN; 825 goto done2; 826 } 827 saved_msgsz = msgsz; 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); 831 error = EAGAIN; 832 goto done2; 833 } 834 PROC_UNLOCK(td->td_proc); 835 } 836 #endif 837 838 segs_needed = howmany(msgsz, msginfo.msgssz); 839 DPRINTF(("msgsz=%zu, msgssz=%d, segs_needed=%d\n", msgsz, 840 msginfo.msgssz, segs_needed)); 841 for (;;) { 842 int need_more_resources = 0; 843 844 /* 845 * check msgsz 846 * (inside this loop in case msg_qbytes changes while we sleep) 847 */ 848 849 if (msgsz > msqkptr->u.msg_qbytes) { 850 DPRINTF(("msgsz > msqkptr->u.msg_qbytes\n")); 851 error = EINVAL; 852 goto done3; 853 } 854 855 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) { 856 DPRINTF(("msqid is locked\n")); 857 need_more_resources = 1; 858 } 859 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) { 860 DPRINTF(("msgsz + msg_cbytes > msg_qbytes\n")); 861 need_more_resources = 1; 862 } 863 if (segs_needed > nfree_msgmaps) { 864 DPRINTF(("segs_needed > nfree_msgmaps\n")); 865 need_more_resources = 1; 866 } 867 if (free_msghdrs == NULL) { 868 DPRINTF(("no more msghdrs\n")); 869 need_more_resources = 1; 870 } 871 872 if (need_more_resources) { 873 int we_own_it; 874 875 if ((msgflg & IPC_NOWAIT) != 0) { 876 DPRINTF(("need more resources but caller " 877 "doesn't want to wait\n")); 878 error = EAGAIN; 879 goto done3; 880 } 881 882 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) { 883 DPRINTF(("we don't own the msqid_ds\n")); 884 we_own_it = 0; 885 } else { 886 /* Force later arrivals to wait for our 887 request */ 888 DPRINTF(("we own the msqid_ds\n")); 889 msqkptr->u.msg_perm.mode |= MSG_LOCKED; 890 we_own_it = 1; 891 } 892 DPRINTF(("msgsnd: goodnight\n")); 893 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH, 894 "msgsnd", hz); 895 DPRINTF(("msgsnd: good morning, error=%d\n", error)); 896 if (we_own_it) 897 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 898 if (error == EWOULDBLOCK) { 899 DPRINTF(("msgsnd: timed out\n")); 900 continue; 901 } 902 if (error != 0) { 903 DPRINTF(("msgsnd: interrupted system call\n")); 904 error = EINTR; 905 goto done3; 906 } 907 908 /* 909 * Make sure that the msq queue still exists 910 */ 911 912 if (msqkptr->u.msg_qbytes == 0) { 913 DPRINTF(("msqid deleted\n")); 914 error = EIDRM; 915 goto done3; 916 } 917 918 } else { 919 DPRINTF(("got all the resources that we need\n")); 920 break; 921 } 922 } 923 924 /* 925 * We have the resources that we need. 926 * Make sure! 927 */ 928 929 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"); 937 938 /* 939 * Re-lock the msqid_ds in case we page-fault when copying in the 940 * message 941 */ 942 943 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) 944 panic("msqid_ds is already locked"); 945 msqkptr->u.msg_perm.mode |= MSG_LOCKED; 946 947 /* 948 * Allocate a message header 949 */ 950 951 msghdr = free_msghdrs; 952 free_msghdrs = msghdr->msg_next; 953 msghdr->msg_spot = -1; 954 msghdr->msg_ts = msgsz; 955 msghdr->msg_type = mtype; 956 #ifdef MAC 957 /* 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)? 961 */ 962 mac_sysvmsg_create(td->td_ucred, msqkptr, msghdr); 963 #endif 964 965 /* 966 * Allocate space for the message 967 */ 968 969 while (segs_needed > 0) { 970 if (nfree_msgmaps <= 0) 971 panic("not enough msgmaps"); 972 if (free_msgmaps == -1) 973 panic("nil free_msgmaps"); 974 next = free_msgmaps; 975 if (next <= -1) 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; 981 nfree_msgmaps--; 982 msgmaps[next].next = msghdr->msg_spot; 983 msghdr->msg_spot = next; 984 segs_needed--; 985 } 986 987 /* 988 * Validate the message type 989 */ 990 991 if (msghdr->msg_type < 1) { 992 msg_freehdr(msghdr); 993 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 994 wakeup(msqkptr); 995 DPRINTF(("mtype (%ld) < 1\n", msghdr->msg_type)); 996 error = EINVAL; 997 goto done3; 998 } 999 1000 /* 1001 * Copy in the message body 1002 */ 1003 1004 next = msghdr->msg_spot; 1005 while (msgsz > 0) { 1006 size_t tlen; 1007 if (msgsz > msginfo.msgssz) 1008 tlen = msginfo.msgssz; 1009 else 1010 tlen = msgsz; 1011 if (next <= -1) 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], 1017 tlen)) != 0) { 1018 mtx_lock(&msq_mtx); 1019 DPRINTF(("error %d copying in message segment\n", 1020 error)); 1021 msg_freehdr(msghdr); 1022 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 1023 wakeup(msqkptr); 1024 goto done3; 1025 } 1026 mtx_lock(&msq_mtx); 1027 msgsz -= tlen; 1028 msgp = (const char *)msgp + tlen; 1029 next = msgmaps[next].next; 1030 } 1031 if (next != -1) 1032 panic("didn't use all the msg segments"); 1033 1034 /* 1035 * We've got the message. Unlock the msqid_ds. 1036 */ 1037 1038 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 1039 1040 /* 1041 * Make sure that the msqid_ds is still allocated. 1042 */ 1043 1044 if (msqkptr->u.msg_qbytes == 0) { 1045 msg_freehdr(msghdr); 1046 wakeup(msqkptr); 1047 error = EIDRM; 1048 goto done3; 1049 } 1050 1051 #ifdef MAC 1052 /* 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 1061 * msgq. 1062 */ 1063 error = mac_sysvmsq_check_msgmsq(td->td_ucred, msghdr, msqkptr); 1064 if (error != 0) { 1065 msg_freehdr(msghdr); 1066 wakeup(msqkptr); 1067 goto done3; 1068 } 1069 #endif 1070 1071 /* 1072 * Put the message into the queue 1073 */ 1074 if (msqkptr->u.__msg_first == NULL) { 1075 msqkptr->u.__msg_first = msghdr; 1076 msqkptr->u.__msg_last = msghdr; 1077 } else { 1078 msqkptr->u.__msg_last->msg_next = msghdr; 1079 msqkptr->u.__msg_last = msghdr; 1080 } 1081 msqkptr->u.__msg_last->msg_next = NULL; 1082 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; 1087 1088 wakeup(msqkptr); 1089 td->td_retval[0] = 0; 1090 done3: 1091 #ifdef RACCT 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); 1097 } 1098 #endif 1099 done2: 1100 mtx_unlock(&msq_mtx); 1101 return (error); 1102 } 1103 1104 int 1105 sys_msgsnd(struct thread *td, struct msgsnd_args *uap) 1106 { 1107 int error; 1108 long mtype; 1109 1110 DPRINTF(("call to msgsnd(%d, %p, %zu, %d)\n", uap->msqid, uap->msgp, 1111 uap->msgsz, uap->msgflg)); 1112 1113 if ((error = copyin(uap->msgp, &mtype, sizeof(mtype))) != 0) { 1114 DPRINTF(("error %d copying the message type\n", error)); 1115 return (error); 1116 } 1117 return (kern_msgsnd(td, uap->msqid, 1118 (const char *)uap->msgp + sizeof(mtype), 1119 uap->msgsz, uap->msgflg, mtype)); 1120 } 1121 1122 #ifndef _SYS_SYSPROTO_H_ 1123 struct msgrcv_args { 1124 int msqid; 1125 void *msgp; 1126 size_t msgsz; 1127 long msgtyp; 1128 int msgflg; 1129 }; 1130 #endif 1131 /* XXX msgp is actually mtext. */ 1132 int 1133 kern_msgrcv(struct thread *td, int msqid, void *msgp, size_t msgsz, long msgtyp, 1134 int msgflg, long *mtype) 1135 { 1136 size_t len; 1137 struct msqid_kernel *msqkptr; 1138 struct msg *msghdr; 1139 struct prison *rpr; 1140 int msqix, error = 0; 1141 short next; 1142 1143 rpr = msg_find_prison(td->td_ucred); 1144 if (rpr == NULL) 1145 return (ENOSYS); 1146 1147 AUDIT_ARG_SVIPC_ID(msqid); 1148 msqix = IPCID_TO_IX(msqid); 1149 1150 if (msqix < 0 || msqix >= msginfo.msgmni) { 1151 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 1152 msginfo.msgmni)); 1153 return (EINVAL); 1154 } 1155 1156 msqkptr = &msqids[msqix]; 1157 mtx_lock(&msq_mtx); 1158 AUDIT_ARG_SVIPC_PERM(&msqkptr->u.msg_perm); 1159 if (msqkptr->u.msg_qbytes == 0) { 1160 DPRINTF(("no such message queue id\n")); 1161 error = EINVAL; 1162 goto done2; 1163 } 1164 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 1165 DPRINTF(("wrong sequence number\n")); 1166 error = EINVAL; 1167 goto done2; 1168 } 1169 1170 if ((error = msq_prison_cansee(rpr, msqkptr))) { 1171 DPRINTF(("requester can't see prison\n")); 1172 goto done2; 1173 } 1174 1175 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) { 1176 DPRINTF(("requester doesn't have read access\n")); 1177 goto done2; 1178 } 1179 1180 #ifdef MAC 1181 error = mac_sysvmsq_check_msqrcv(td->td_ucred, msqkptr); 1182 if (error != 0) 1183 goto done2; 1184 #endif 1185 1186 msghdr = NULL; 1187 while (msghdr == NULL) { 1188 if (msgtyp == 0) { 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)); 1196 error = E2BIG; 1197 goto done2; 1198 } 1199 #ifdef MAC 1200 error = mac_sysvmsq_check_msgrcv(td->td_ucred, 1201 msghdr); 1202 if (error != 0) 1203 goto done2; 1204 #endif 1205 if (msqkptr->u.__msg_first == 1206 msqkptr->u.__msg_last) { 1207 msqkptr->u.__msg_first = NULL; 1208 msqkptr->u.__msg_last = NULL; 1209 } else { 1210 msqkptr->u.__msg_first = msghdr->msg_next; 1211 if (msqkptr->u.__msg_first == NULL) 1212 panic("msg_first/last screwed up #1"); 1213 } 1214 } 1215 } else { 1216 struct msg *previous; 1217 struct msg **prev; 1218 1219 previous = NULL; 1220 prev = &(msqkptr->u.__msg_first); 1221 while ((msghdr = *prev) != NULL) { 1222 /* 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! 1229 */ 1230 1231 if (msgtyp == msghdr->msg_type || 1232 msghdr->msg_type <= -msgtyp) { 1233 DPRINTF(("found message type %ld, " 1234 "requested %ld\n", 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)); 1242 error = E2BIG; 1243 goto done2; 1244 } 1245 #ifdef MAC 1246 error = mac_sysvmsq_check_msgrcv( 1247 td->td_ucred, msghdr); 1248 if (error != 0) 1249 goto done2; 1250 #endif 1251 *prev = msghdr->msg_next; 1252 if (msghdr == msqkptr->u.__msg_last) { 1253 if (previous == NULL) { 1254 if (prev != 1255 &msqkptr->u.__msg_first) 1256 panic("__msg_first/last screwed up #2"); 1257 msqkptr->u.__msg_first = 1258 NULL; 1259 msqkptr->u.__msg_last = 1260 NULL; 1261 } else { 1262 if (prev == 1263 &msqkptr->u.__msg_first) 1264 panic("__msg_first/last screwed up #3"); 1265 msqkptr->u.__msg_last = 1266 previous; 1267 } 1268 } 1269 break; 1270 } 1271 previous = msghdr; 1272 prev = &(msghdr->msg_next); 1273 } 1274 } 1275 1276 /* 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. 1280 */ 1281 1282 if (msghdr != NULL) 1283 break; 1284 1285 /* 1286 * Hmph! No message found. Does the user want to wait? 1287 */ 1288 1289 if ((msgflg & IPC_NOWAIT) != 0) { 1290 DPRINTF(("no appropriate message found (msgtyp=%ld)\n", 1291 msgtyp)); 1292 /* The SVID says to return ENOMSG. */ 1293 error = ENOMSG; 1294 goto done2; 1295 } 1296 1297 /* 1298 * Wait for something to happen 1299 */ 1300 1301 DPRINTF(("msgrcv: goodnight\n")); 1302 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH, 1303 "msgrcv", 0); 1304 DPRINTF(("msgrcv: good morning (error=%d)\n", error)); 1305 1306 if (error != 0) { 1307 DPRINTF(("msgrcv: interrupted system call\n")); 1308 error = EINTR; 1309 goto done2; 1310 } 1311 1312 /* 1313 * Make sure that the msq queue still exists 1314 */ 1315 1316 if (msqkptr->u.msg_qbytes == 0 || 1317 msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 1318 DPRINTF(("msqid deleted\n")); 1319 error = EIDRM; 1320 goto done2; 1321 } 1322 } 1323 1324 /* 1325 * Return the message to the user. 1326 * 1327 * First, do the bookkeeping (before we risk being interrupted). 1328 */ 1329 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; 1334 1335 racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, 1); 1336 racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msghdr->msg_ts); 1337 1338 /* 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). 1342 */ 1343 1344 DPRINTF(("found a message, msgsz=%zu, msg_ts=%hu\n", msgsz, 1345 msghdr->msg_ts)); 1346 if (msgsz > msghdr->msg_ts) 1347 msgsz = msghdr->msg_ts; 1348 *mtype = msghdr->msg_type; 1349 1350 /* 1351 * Return the segments to the user 1352 */ 1353 1354 next = msghdr->msg_spot; 1355 for (len = 0; len < msgsz; len += msginfo.msgssz) { 1356 size_t tlen; 1357 1358 if (msgsz - len > msginfo.msgssz) 1359 tlen = msginfo.msgssz; 1360 else 1361 tlen = msgsz - len; 1362 if (next <= -1) 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); 1368 mtx_lock(&msq_mtx); 1369 if (error != 0) { 1370 DPRINTF(("error (%d) copying out message segment\n", 1371 error)); 1372 msg_freehdr(msghdr); 1373 wakeup(msqkptr); 1374 goto done2; 1375 } 1376 msgp = (char *)msgp + tlen; 1377 next = msgmaps[next].next; 1378 } 1379 1380 /* 1381 * Done, return the actual number of bytes copied out. 1382 */ 1383 1384 msg_freehdr(msghdr); 1385 wakeup(msqkptr); 1386 td->td_retval[0] = msgsz; 1387 done2: 1388 mtx_unlock(&msq_mtx); 1389 return (error); 1390 } 1391 1392 int 1393 sys_msgrcv(struct thread *td, struct msgrcv_args *uap) 1394 { 1395 int error; 1396 long mtype; 1397 1398 DPRINTF(("call to msgrcv(%d, %p, %zu, %ld, %d)\n", uap->msqid, 1399 uap->msgp, uap->msgsz, uap->msgtyp, uap->msgflg)); 1400 1401 if ((error = kern_msgrcv(td, uap->msqid, 1402 (char *)uap->msgp + sizeof(mtype), uap->msgsz, 1403 uap->msgtyp, uap->msgflg, &mtype)) != 0) 1404 return (error); 1405 if ((error = copyout(&mtype, uap->msgp, sizeof(mtype))) != 0) 1406 DPRINTF(("error %d copying the message type\n", error)); 1407 return (error); 1408 } 1409 1410 static int 1411 sysctl_msqids(SYSCTL_HANDLER_ARGS) 1412 { 1413 struct msqid_kernel tmsqk; 1414 #ifdef COMPAT_FREEBSD32 1415 struct msqid_kernel32 tmsqk32; 1416 #endif 1417 struct prison *pr, *rpr; 1418 void *outaddr; 1419 size_t outsize; 1420 int error, i; 1421 1422 pr = req->td->td_ucred->cr_prison; 1423 rpr = msg_find_prison(req->td->td_ucred); 1424 error = 0; 1425 for (i = 0; i < msginfo.msgmni; i++) { 1426 mtx_lock(&msq_mtx); 1427 if (msqids[i].u.msg_qbytes == 0 || rpr == NULL || 1428 msq_prison_cansee(rpr, &msqids[i]) != 0) 1429 bzero(&tmsqk, sizeof(tmsqk)); 1430 else { 1431 tmsqk = msqids[i]; 1432 if (tmsqk.cred->cr_prison != pr) 1433 tmsqk.u.msg_perm.key = IPC_PRIVATE; 1434 } 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 */ 1451 outaddr = &tmsqk32; 1452 outsize = sizeof(tmsqk32); 1453 } else 1454 #endif 1455 { 1456 /* Don't leak kernel pointers */ 1457 tmsqk.u.__msg_first = NULL; 1458 tmsqk.u.__msg_last = NULL; 1459 tmsqk.label = NULL; 1460 tmsqk.cred = NULL; 1461 /* 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. 1465 */ 1466 outaddr = &tmsqk; 1467 outsize = sizeof(tmsqk); 1468 } 1469 error = SYSCTL_OUT(req, outaddr, outsize); 1470 if (error != 0) 1471 break; 1472 } 1473 return (error); 1474 } 1475 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"); 1492 1493 static int 1494 msg_prison_check(void *obj, void *data) 1495 { 1496 struct prison *pr = obj; 1497 struct prison *prpr; 1498 struct vfsoptlist *opts = data; 1499 int error, jsys; 1500 1501 /* 1502 * sysvmsg is a jailsys integer. 1503 * It must be "disable" if the parent jail is disabled. 1504 */ 1505 error = vfs_copyopt(opts, "sysvmsg", &jsys, sizeof(jsys)); 1506 if (error != ENOENT) { 1507 if (error != 0) 1508 return (error); 1509 switch (jsys) { 1510 case JAIL_SYS_DISABLE: 1511 break; 1512 case JAIL_SYS_NEW: 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); 1517 if (prpr == NULL) 1518 return (EPERM); 1519 break; 1520 default: 1521 return (EINVAL); 1522 } 1523 } 1524 1525 return (0); 1526 } 1527 1528 static int 1529 msg_prison_set(void *obj, void *data) 1530 { 1531 struct prison *pr = obj; 1532 struct prison *tpr, *orpr, *nrpr, *trpr; 1533 struct vfsoptlist *opts = data; 1534 void *rsv; 1535 int jsys, descend; 1536 1537 /* 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. 1540 */ 1541 if (vfs_copyopt(opts, "sysvmsg", &jsys, sizeof(jsys)) == ENOENT) 1542 jsys = vfs_flagopt(opts, "allow.sysvipc", NULL, 0) 1543 ? JAIL_SYS_INHERIT 1544 : vfs_flagopt(opts, "allow.nosysvipc", NULL, 0) 1545 ? JAIL_SYS_DISABLE 1546 : -1; 1547 if (jsys == JAIL_SYS_DISABLE) { 1548 prison_lock(pr); 1549 orpr = osd_jail_get(pr, msg_prison_slot); 1550 if (orpr != NULL) 1551 osd_jail_del(pr, msg_prison_slot); 1552 prison_unlock(pr); 1553 if (orpr != NULL) { 1554 if (orpr == pr) 1555 msg_prison_cleanup(pr); 1556 /* Disable all child jails as well. */ 1557 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1558 prison_lock(tpr); 1559 trpr = osd_jail_get(tpr, msg_prison_slot); 1560 if (trpr != NULL) { 1561 osd_jail_del(tpr, msg_prison_slot); 1562 prison_unlock(tpr); 1563 if (trpr == tpr) 1564 msg_prison_cleanup(tpr); 1565 } else { 1566 prison_unlock(tpr); 1567 descend = 0; 1568 } 1569 } 1570 } 1571 } else if (jsys != -1) { 1572 if (jsys == JAIL_SYS_NEW) 1573 nrpr = pr; 1574 else { 1575 prison_lock(pr->pr_parent); 1576 nrpr = osd_jail_get(pr->pr_parent, msg_prison_slot); 1577 prison_unlock(pr->pr_parent); 1578 } 1579 rsv = osd_reserve(msg_prison_slot); 1580 prison_lock(pr); 1581 orpr = osd_jail_get(pr, msg_prison_slot); 1582 if (orpr != nrpr) 1583 (void)osd_jail_set_reserved(pr, msg_prison_slot, rsv, 1584 nrpr); 1585 else 1586 osd_free_reserved(rsv); 1587 prison_unlock(pr); 1588 if (orpr != nrpr) { 1589 if (orpr == pr) 1590 msg_prison_cleanup(pr); 1591 if (orpr != NULL) { 1592 /* Change child jails matching the old root, */ 1593 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1594 prison_lock(tpr); 1595 trpr = osd_jail_get(tpr, 1596 msg_prison_slot); 1597 if (trpr == orpr) { 1598 (void)osd_jail_set(tpr, 1599 msg_prison_slot, nrpr); 1600 prison_unlock(tpr); 1601 if (trpr == tpr) 1602 msg_prison_cleanup(tpr); 1603 } else { 1604 prison_unlock(tpr); 1605 descend = 0; 1606 } 1607 } 1608 } 1609 } 1610 } 1611 1612 return (0); 1613 } 1614 1615 static int 1616 msg_prison_get(void *obj, void *data) 1617 { 1618 struct prison *pr = obj; 1619 struct prison *rpr; 1620 struct vfsoptlist *opts = data; 1621 int error, jsys; 1622 1623 /* Set sysvmsg based on the jail's root prison. */ 1624 prison_lock(pr); 1625 rpr = osd_jail_get(pr, msg_prison_slot); 1626 prison_unlock(pr); 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) 1631 error = 0; 1632 return (error); 1633 } 1634 1635 static int 1636 msg_prison_remove(void *obj, void *data __unused) 1637 { 1638 struct prison *pr = obj; 1639 struct prison *rpr; 1640 1641 prison_lock(pr); 1642 rpr = osd_jail_get(pr, msg_prison_slot); 1643 prison_unlock(pr); 1644 if (rpr == pr) 1645 msg_prison_cleanup(pr); 1646 return (0); 1647 } 1648 1649 static void 1650 msg_prison_cleanup(struct prison *pr) 1651 { 1652 struct msqid_kernel *msqkptr; 1653 int i; 1654 1655 /* Remove any msqs that belong to this jail. */ 1656 mtx_lock(&msq_mtx); 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); 1662 } 1663 mtx_unlock(&msq_mtx); 1664 } 1665 1666 SYSCTL_JAIL_PARAM_SYS_NODE(sysvmsg, CTLFLAG_RW, "SYSV message queues"); 1667 1668 #ifdef COMPAT_FREEBSD32 1669 int 1670 freebsd32_msgsys(struct thread *td, struct freebsd32_msgsys_args *uap) 1671 { 1672 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) { 1677 case 0: 1678 return (freebsd7_freebsd32_msgctl(td, 1679 (struct freebsd7_freebsd32_msgctl_args *)&uap->a2)); 1680 case 2: 1681 return (freebsd32_msgsnd(td, 1682 (struct freebsd32_msgsnd_args *)&uap->a2)); 1683 case 3: 1684 return (freebsd32_msgrcv(td, 1685 (struct freebsd32_msgrcv_args *)&uap->a2)); 1686 default: 1687 return (sys_msgsys(td, (struct msgsys_args *)uap)); 1688 } 1689 #else 1690 return (nosys(td, NULL)); 1691 #endif 1692 } 1693 1694 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1695 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1696 int 1697 freebsd7_freebsd32_msgctl(struct thread *td, 1698 struct freebsd7_freebsd32_msgctl_args *uap) 1699 { 1700 struct msqid_ds msqbuf; 1701 struct msqid_ds32_old msqbuf32; 1702 int error; 1703 1704 if (uap->cmd == IPC_SET) { 1705 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32)); 1706 if (error) 1707 return (error); 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); 1719 } 1720 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1721 if (error) 1722 return (error); 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)); 1737 } 1738 return (error); 1739 } 1740 #endif 1741 1742 int 1743 freebsd32_msgctl(struct thread *td, struct freebsd32_msgctl_args *uap) 1744 { 1745 struct msqid_ds msqbuf; 1746 struct msqid_ds32 msqbuf32; 1747 int error; 1748 1749 if (uap->cmd == IPC_SET) { 1750 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32)); 1751 if (error) 1752 return (error); 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); 1764 } 1765 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1766 if (error) 1767 return (error); 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)); 1781 } 1782 return (error); 1783 } 1784 1785 int 1786 freebsd32_msgsnd(struct thread *td, struct freebsd32_msgsnd_args *uap) 1787 { 1788 const void *msgp; 1789 long mtype; 1790 int32_t mtype32; 1791 int error; 1792 1793 msgp = PTRIN(uap->msgp); 1794 if ((error = copyin(msgp, &mtype32, sizeof(mtype32))) != 0) 1795 return (error); 1796 mtype = mtype32; 1797 return (kern_msgsnd(td, uap->msqid, 1798 (const char *)msgp + sizeof(mtype32), 1799 uap->msgsz, uap->msgflg, mtype)); 1800 } 1801 1802 int 1803 freebsd32_msgrcv(struct thread *td, struct freebsd32_msgrcv_args *uap) 1804 { 1805 void *msgp; 1806 long mtype; 1807 int32_t mtype32; 1808 int error; 1809 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) 1814 return (error); 1815 mtype32 = (int32_t)mtype; 1816 return (copyout(&mtype32, msgp, sizeof(mtype32))); 1817 } 1818 #endif 1819 1820 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1821 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1822 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 1827 }; 1828 1829 /* 1830 * Entry point for all MSG calls. 1831 * 1832 * XXX actually varargs. 1833 * struct msgsys_args { 1834 * int which; 1835 * int a2; 1836 * int a3; 1837 * int a4; 1838 * int a5; 1839 * int a6; 1840 * } *uap; 1841 */ 1842 int 1843 sys_msgsys(struct thread *td, struct msgsys_args *uap) 1844 { 1845 int error; 1846 1847 AUDIT_ARG_SVIPC_WHICH(uap->which); 1848 if (uap->which < 0 || uap->which >= nitems(msgcalls)) 1849 return (EINVAL); 1850 error = (*msgcalls[uap->which])(td, &uap->a2); 1851 return (error); 1852 } 1853 1854 #ifndef CP 1855 #define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0) 1856 #endif 1857 1858 #ifndef _SYS_SYSPROTO_H_ 1859 struct freebsd7_msgctl_args { 1860 int msqid; 1861 int cmd; 1862 struct msqid_ds_old *buf; 1863 }; 1864 #endif 1865 int 1866 freebsd7_msgctl(struct thread *td, struct freebsd7_msgctl_args *uap) 1867 { 1868 struct msqid_ds_old msqold; 1869 struct msqid_ds msqbuf; 1870 int error; 1871 1872 DPRINTF(("call to freebsd7_msgctl(%d, %d, %p)\n", uap->msqid, uap->cmd, 1873 uap->buf)); 1874 if (uap->cmd == IPC_SET) { 1875 error = copyin(uap->buf, &msqold, sizeof(msqold)); 1876 if (error) 1877 return (error); 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); 1889 } 1890 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1891 if (error) 1892 return (error); 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)); 1907 } 1908 return (error); 1909 } 1910 1911 #undef CP 1912 1913 #endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 || 1914 COMPAT_FREEBSD7 */ 1915