Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/sysv_msg.c
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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: releng/12.0/sys/kern/sysv_msg.c 334486 2018-06-01 13:26:45Z emaste $"); 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 *); 101 102 103 #ifdef MSG_DEBUG 104 #define DPRINTF(a) printf a 105 #else 106 #define DPRINTF(a) (void)0 107 #endif 108 109 static void msg_freehdr(struct msg *msghdr); 110 111 #ifndef MSGSSZ 112 #define MSGSSZ 8 /* Each segment must be 2^N long */ 113 #endif 114 #ifndef MSGSEG 115 #define MSGSEG 2048 /* must be less than 32767 */ 116 #endif 117 #define MSGMAX (MSGSSZ*MSGSEG) 118 #ifndef MSGMNB 119 #define MSGMNB 2048 /* max # of bytes in a queue */ 120 #endif 121 #ifndef MSGMNI 122 #define MSGMNI 40 123 #endif 124 #ifndef MSGTQL 125 #define MSGTQL 40 126 #endif 127 128 /* 129 * Based on the configuration parameters described in an SVR2 (yes, two) 130 * config(1m) man page. 131 * 132 * Each message is broken up and stored in segments that are msgssz bytes 133 * long. For efficiency reasons, this should be a power of two. Also, 134 * it doesn't make sense if it is less than 8 or greater than about 256. 135 * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of 136 * two between 8 and 1024 inclusive (and panic's if it isn't). 137 */ 138 struct msginfo msginfo = { 139 MSGMAX, /* max chars in a message */ 140 MSGMNI, /* # of message queue identifiers */ 141 MSGMNB, /* max chars in a queue */ 142 MSGTQL, /* max messages in system */ 143 MSGSSZ, /* size of a message segment */ 144 /* (must be small power of 2 greater than 4) */ 145 MSGSEG /* number of message segments */ 146 }; 147 148 /* 149 * macros to convert between msqid_ds's and msqid's. 150 * (specific to this implementation) 151 */ 152 #define MSQID(ix,ds) ((ix) & 0xffff | (((ds).msg_perm.seq << 16) & 0xffff0000)) 153 #define MSQID_IX(id) ((id) & 0xffff) 154 #define MSQID_SEQ(id) (((id) >> 16) & 0xffff) 155 156 /* 157 * The rest of this file is specific to this particular implementation. 158 */ 159 160 struct msgmap { 161 short next; /* next segment in buffer */ 162 /* -1 -> available */ 163 /* 0..(MSGSEG-1) -> index of next segment */ 164 }; 165 166 #define MSG_LOCKED 01000 /* Is this msqid_ds locked? */ 167 168 static int nfree_msgmaps; /* # of free map entries */ 169 static short free_msgmaps; /* head of linked list of free map entries */ 170 static struct msg *free_msghdrs;/* list of free msg headers */ 171 static char *msgpool; /* MSGMAX byte long msg buffer pool */ 172 static struct msgmap *msgmaps; /* MSGSEG msgmap structures */ 173 static struct msg *msghdrs; /* MSGTQL msg headers */ 174 static struct msqid_kernel *msqids; /* MSGMNI msqid_kernel struct's */ 175 static struct mtx msq_mtx; /* global mutex for message queues. */ 176 static unsigned msg_prison_slot;/* prison OSD slot */ 177 178 static struct syscall_helper_data msg_syscalls[] = { 179 SYSCALL_INIT_HELPER(msgctl), 180 SYSCALL_INIT_HELPER(msgget), 181 SYSCALL_INIT_HELPER(msgsnd), 182 SYSCALL_INIT_HELPER(msgrcv), 183 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 184 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 185 SYSCALL_INIT_HELPER(msgsys), 186 SYSCALL_INIT_HELPER_COMPAT(freebsd7_msgctl), 187 #endif 188 SYSCALL_INIT_LAST 189 }; 190 191 #ifdef COMPAT_FREEBSD32 192 #include <compat/freebsd32/freebsd32.h> 193 #include <compat/freebsd32/freebsd32_ipc.h> 194 #include <compat/freebsd32/freebsd32_proto.h> 195 #include <compat/freebsd32/freebsd32_signal.h> 196 #include <compat/freebsd32/freebsd32_syscall.h> 197 #include <compat/freebsd32/freebsd32_util.h> 198 199 static struct syscall_helper_data msg32_syscalls[] = { 200 SYSCALL32_INIT_HELPER(freebsd32_msgctl), 201 SYSCALL32_INIT_HELPER(freebsd32_msgsnd), 202 SYSCALL32_INIT_HELPER(freebsd32_msgrcv), 203 SYSCALL32_INIT_HELPER_COMPAT(msgget), 204 SYSCALL32_INIT_HELPER(freebsd32_msgsys), 205 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 206 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 207 SYSCALL32_INIT_HELPER(freebsd7_freebsd32_msgctl), 208 #endif 209 SYSCALL_INIT_LAST 210 }; 211 #endif 212 213 static int 214 msginit() 215 { 216 struct prison *pr; 217 void **rsv; 218 int i, error; 219 osd_method_t methods[PR_MAXMETHOD] = { 220 [PR_METHOD_CHECK] = msg_prison_check, 221 [PR_METHOD_SET] = msg_prison_set, 222 [PR_METHOD_GET] = msg_prison_get, 223 [PR_METHOD_REMOVE] = msg_prison_remove, 224 }; 225 226 msginfo.msgmax = msginfo.msgseg * msginfo.msgssz; 227 msgpool = malloc(msginfo.msgmax, M_MSG, M_WAITOK); 228 msgmaps = malloc(sizeof(struct msgmap) * msginfo.msgseg, M_MSG, M_WAITOK); 229 msghdrs = malloc(sizeof(struct msg) * msginfo.msgtql, M_MSG, M_WAITOK); 230 msqids = malloc(sizeof(struct msqid_kernel) * msginfo.msgmni, M_MSG, 231 M_WAITOK | M_ZERO); 232 233 /* 234 * msginfo.msgssz should be a power of two for efficiency reasons. 235 * It is also pretty silly if msginfo.msgssz is less than 8 236 * or greater than about 256 so ... 237 */ 238 239 i = 8; 240 while (i < 1024 && i != msginfo.msgssz) 241 i <<= 1; 242 if (i != msginfo.msgssz) { 243 DPRINTF(("msginfo.msgssz=%d (0x%x)\n", msginfo.msgssz, 244 msginfo.msgssz)); 245 panic("msginfo.msgssz not a small power of 2"); 246 } 247 248 if (msginfo.msgseg > 32767) { 249 DPRINTF(("msginfo.msgseg=%d\n", msginfo.msgseg)); 250 panic("msginfo.msgseg > 32767"); 251 } 252 253 for (i = 0; i < msginfo.msgseg; i++) { 254 if (i > 0) 255 msgmaps[i-1].next = i; 256 msgmaps[i].next = -1; /* implies entry is available */ 257 } 258 free_msgmaps = 0; 259 nfree_msgmaps = msginfo.msgseg; 260 261 for (i = 0; i < msginfo.msgtql; i++) { 262 msghdrs[i].msg_type = 0; 263 if (i > 0) 264 msghdrs[i-1].msg_next = &msghdrs[i]; 265 msghdrs[i].msg_next = NULL; 266 #ifdef MAC 267 mac_sysvmsg_init(&msghdrs[i]); 268 #endif 269 } 270 free_msghdrs = &msghdrs[0]; 271 272 for (i = 0; i < msginfo.msgmni; i++) { 273 msqids[i].u.msg_qbytes = 0; /* implies entry is available */ 274 msqids[i].u.msg_perm.seq = 0; /* reset to a known value */ 275 msqids[i].u.msg_perm.mode = 0; 276 #ifdef MAC 277 mac_sysvmsq_init(&msqids[i]); 278 #endif 279 } 280 mtx_init(&msq_mtx, "msq", NULL, MTX_DEF); 281 282 /* Set current prisons according to their allow.sysvipc. */ 283 msg_prison_slot = osd_jail_register(NULL, methods); 284 rsv = osd_reserve(msg_prison_slot); 285 prison_lock(&prison0); 286 (void)osd_jail_set_reserved(&prison0, msg_prison_slot, rsv, &prison0); 287 prison_unlock(&prison0); 288 rsv = NULL; 289 sx_slock(&allprison_lock); 290 TAILQ_FOREACH(pr, &allprison, pr_list) { 291 if (rsv == NULL) 292 rsv = osd_reserve(msg_prison_slot); 293 prison_lock(pr); 294 if ((pr->pr_allow & PR_ALLOW_SYSVIPC) && pr->pr_ref > 0) { 295 (void)osd_jail_set_reserved(pr, msg_prison_slot, rsv, 296 &prison0); 297 rsv = NULL; 298 } 299 prison_unlock(pr); 300 } 301 if (rsv != NULL) 302 osd_free_reserved(rsv); 303 sx_sunlock(&allprison_lock); 304 305 error = syscall_helper_register(msg_syscalls, SY_THR_STATIC_KLD); 306 if (error != 0) 307 return (error); 308 #ifdef COMPAT_FREEBSD32 309 error = syscall32_helper_register(msg32_syscalls, SY_THR_STATIC_KLD); 310 if (error != 0) 311 return (error); 312 #endif 313 return (0); 314 } 315 316 static int 317 msgunload() 318 { 319 struct msqid_kernel *msqkptr; 320 int msqid; 321 #ifdef MAC 322 int i; 323 #endif 324 325 syscall_helper_unregister(msg_syscalls); 326 #ifdef COMPAT_FREEBSD32 327 syscall32_helper_unregister(msg32_syscalls); 328 #endif 329 330 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 331 msqkptr = &msqids[msqid]; 332 if (msqkptr->u.msg_qbytes != 0 || 333 (msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) 334 break; 335 } 336 if (msqid != msginfo.msgmni) 337 return (EBUSY); 338 339 if (msg_prison_slot != 0) 340 osd_jail_deregister(msg_prison_slot); 341 #ifdef MAC 342 for (i = 0; i < msginfo.msgtql; i++) 343 mac_sysvmsg_destroy(&msghdrs[i]); 344 for (msqid = 0; msqid < msginfo.msgmni; msqid++) 345 mac_sysvmsq_destroy(&msqids[msqid]); 346 #endif 347 free(msgpool, M_MSG); 348 free(msgmaps, M_MSG); 349 free(msghdrs, M_MSG); 350 free(msqids, M_MSG); 351 mtx_destroy(&msq_mtx); 352 return (0); 353 } 354 355 356 static int 357 sysvmsg_modload(struct module *module, int cmd, void *arg) 358 { 359 int error = 0; 360 361 switch (cmd) { 362 case MOD_LOAD: 363 error = msginit(); 364 if (error != 0) 365 msgunload(); 366 break; 367 case MOD_UNLOAD: 368 error = msgunload(); 369 break; 370 case MOD_SHUTDOWN: 371 break; 372 default: 373 error = EINVAL; 374 break; 375 } 376 return (error); 377 } 378 379 static moduledata_t sysvmsg_mod = { 380 "sysvmsg", 381 &sysvmsg_modload, 382 NULL 383 }; 384 385 DECLARE_MODULE(sysvmsg, sysvmsg_mod, SI_SUB_SYSV_MSG, SI_ORDER_FIRST); 386 MODULE_VERSION(sysvmsg, 1); 387 388 static void 389 msg_freehdr(struct msg *msghdr) 390 { 391 while (msghdr->msg_ts > 0) { 392 short next; 393 if (msghdr->msg_spot < 0 || msghdr->msg_spot >= msginfo.msgseg) 394 panic("msghdr->msg_spot out of range"); 395 next = msgmaps[msghdr->msg_spot].next; 396 msgmaps[msghdr->msg_spot].next = free_msgmaps; 397 free_msgmaps = msghdr->msg_spot; 398 nfree_msgmaps++; 399 msghdr->msg_spot = next; 400 if (msghdr->msg_ts >= msginfo.msgssz) 401 msghdr->msg_ts -= msginfo.msgssz; 402 else 403 msghdr->msg_ts = 0; 404 } 405 if (msghdr->msg_spot != -1) 406 panic("msghdr->msg_spot != -1"); 407 msghdr->msg_next = free_msghdrs; 408 free_msghdrs = msghdr; 409 #ifdef MAC 410 mac_sysvmsg_cleanup(msghdr); 411 #endif 412 } 413 414 static void 415 msq_remove(struct msqid_kernel *msqkptr) 416 { 417 struct msg *msghdr; 418 419 racct_sub_cred(msqkptr->cred, RACCT_NMSGQ, 1); 420 racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, msqkptr->u.msg_qnum); 421 racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msqkptr->u.msg_cbytes); 422 crfree(msqkptr->cred); 423 msqkptr->cred = NULL; 424 425 /* Free the message headers */ 426 msghdr = msqkptr->u.__msg_first; 427 while (msghdr != NULL) { 428 struct msg *msghdr_tmp; 429 430 /* Free the segments of each message */ 431 msqkptr->u.msg_cbytes -= msghdr->msg_ts; 432 msqkptr->u.msg_qnum--; 433 msghdr_tmp = msghdr; 434 msghdr = msghdr->msg_next; 435 msg_freehdr(msghdr_tmp); 436 } 437 438 if (msqkptr->u.msg_cbytes != 0) 439 panic("msg_cbytes is screwed up"); 440 if (msqkptr->u.msg_qnum != 0) 441 panic("msg_qnum is screwed up"); 442 443 msqkptr->u.msg_qbytes = 0; /* Mark it as free */ 444 445 #ifdef MAC 446 mac_sysvmsq_cleanup(msqkptr); 447 #endif 448 449 wakeup(msqkptr); 450 } 451 452 static struct prison * 453 msg_find_prison(struct ucred *cred) 454 { 455 struct prison *pr, *rpr; 456 457 pr = cred->cr_prison; 458 prison_lock(pr); 459 rpr = osd_jail_get(pr, msg_prison_slot); 460 prison_unlock(pr); 461 return rpr; 462 } 463 464 static int 465 msq_prison_cansee(struct prison *rpr, struct msqid_kernel *msqkptr) 466 { 467 468 if (msqkptr->cred == NULL || 469 !(rpr == msqkptr->cred->cr_prison || 470 prison_ischild(rpr, msqkptr->cred->cr_prison))) 471 return (EINVAL); 472 return (0); 473 } 474 475 #ifndef _SYS_SYSPROTO_H_ 476 struct msgctl_args { 477 int msqid; 478 int cmd; 479 struct msqid_ds *buf; 480 }; 481 #endif 482 int 483 sys_msgctl(struct thread *td, struct msgctl_args *uap) 484 { 485 int msqid = uap->msqid; 486 int cmd = uap->cmd; 487 struct msqid_ds msqbuf; 488 int error; 489 490 DPRINTF(("call to msgctl(%d, %d, %p)\n", msqid, cmd, uap->buf)); 491 if (cmd == IPC_SET && 492 (error = copyin(uap->buf, &msqbuf, sizeof(msqbuf))) != 0) 493 return (error); 494 error = kern_msgctl(td, msqid, cmd, &msqbuf); 495 if (cmd == IPC_STAT && error == 0) 496 error = copyout(&msqbuf, uap->buf, sizeof(struct msqid_ds)); 497 return (error); 498 } 499 500 int 501 kern_msgctl(struct thread *td, int msqid, int cmd, struct msqid_ds *msqbuf) 502 { 503 int rval, error, msqix; 504 struct msqid_kernel *msqkptr; 505 struct prison *rpr; 506 507 rpr = msg_find_prison(td->td_ucred); 508 if (rpr == NULL) 509 return (ENOSYS); 510 511 AUDIT_ARG_SVIPC_CMD(cmd); 512 AUDIT_ARG_SVIPC_ID(msqid); 513 msqix = IPCID_TO_IX(msqid); 514 515 if (msqix < 0 || msqix >= msginfo.msgmni) { 516 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 517 msginfo.msgmni)); 518 return (EINVAL); 519 } 520 521 msqkptr = &msqids[msqix]; 522 523 mtx_lock(&msq_mtx); 524 if (msqkptr->u.msg_qbytes == 0) { 525 DPRINTF(("no such msqid\n")); 526 error = EINVAL; 527 goto done2; 528 } 529 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 530 DPRINTF(("wrong sequence number\n")); 531 error = EINVAL; 532 goto done2; 533 } 534 535 error = msq_prison_cansee(rpr, msqkptr); 536 if (error != 0) { 537 DPRINTF(("requester can't see prison\n")); 538 goto done2; 539 } 540 541 #ifdef MAC 542 error = mac_sysvmsq_check_msqctl(td->td_ucred, msqkptr, cmd); 543 if (error != 0) 544 goto done2; 545 #endif 546 547 error = 0; 548 rval = 0; 549 550 switch (cmd) { 551 552 case IPC_RMID: 553 { 554 #ifdef MAC 555 struct msg *msghdr; 556 #endif 557 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M))) 558 goto done2; 559 560 #ifdef MAC 561 /* 562 * Check that the thread has MAC access permissions to 563 * individual msghdrs. Note: We need to do this in a 564 * separate loop because the actual loop alters the 565 * msq/msghdr info as it progresses, and there is no going 566 * back if half the way through we discover that the 567 * thread cannot free a certain msghdr. The msq will get 568 * into an inconsistent state. 569 */ 570 for (msghdr = msqkptr->u.__msg_first; msghdr != NULL; 571 msghdr = msghdr->msg_next) { 572 error = mac_sysvmsq_check_msgrmid(td->td_ucred, msghdr); 573 if (error != 0) 574 goto done2; 575 } 576 #endif 577 578 msq_remove(msqkptr); 579 } 580 581 break; 582 583 case IPC_SET: 584 AUDIT_ARG_SVIPC_PERM(&msqbuf->msg_perm); 585 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M))) 586 goto done2; 587 if (msqbuf->msg_qbytes > msqkptr->u.msg_qbytes) { 588 error = priv_check(td, PRIV_IPC_MSGSIZE); 589 if (error) 590 goto done2; 591 } 592 if (msqbuf->msg_qbytes > msginfo.msgmnb) { 593 DPRINTF(("can't increase msg_qbytes beyond %d" 594 "(truncating)\n", msginfo.msgmnb)); 595 msqbuf->msg_qbytes = msginfo.msgmnb; /* silently restrict qbytes to system limit */ 596 } 597 if (msqbuf->msg_qbytes == 0) { 598 DPRINTF(("can't reduce msg_qbytes to 0\n")); 599 error = EINVAL; /* non-standard errno! */ 600 goto done2; 601 } 602 msqkptr->u.msg_perm.uid = msqbuf->msg_perm.uid; /* change the owner */ 603 msqkptr->u.msg_perm.gid = msqbuf->msg_perm.gid; /* change the owner */ 604 msqkptr->u.msg_perm.mode = (msqkptr->u.msg_perm.mode & ~0777) | 605 (msqbuf->msg_perm.mode & 0777); 606 msqkptr->u.msg_qbytes = msqbuf->msg_qbytes; 607 msqkptr->u.msg_ctime = time_second; 608 break; 609 610 case IPC_STAT: 611 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) { 612 DPRINTF(("requester doesn't have read access\n")); 613 goto done2; 614 } 615 *msqbuf = msqkptr->u; 616 if (td->td_ucred->cr_prison != msqkptr->cred->cr_prison) 617 msqbuf->msg_perm.key = IPC_PRIVATE; 618 break; 619 620 default: 621 DPRINTF(("invalid command %d\n", cmd)); 622 error = EINVAL; 623 goto done2; 624 } 625 626 if (error == 0) 627 td->td_retval[0] = rval; 628 done2: 629 mtx_unlock(&msq_mtx); 630 return (error); 631 } 632 633 #ifndef _SYS_SYSPROTO_H_ 634 struct msgget_args { 635 key_t key; 636 int msgflg; 637 }; 638 #endif 639 640 int 641 sys_msgget(struct thread *td, struct msgget_args *uap) 642 { 643 int msqid, error = 0; 644 int key = uap->key; 645 int msgflg = uap->msgflg; 646 struct ucred *cred = td->td_ucred; 647 struct msqid_kernel *msqkptr = NULL; 648 649 DPRINTF(("msgget(0x%x, 0%o)\n", key, msgflg)); 650 651 if (msg_find_prison(cred) == NULL) 652 return (ENOSYS); 653 654 mtx_lock(&msq_mtx); 655 if (key != IPC_PRIVATE) { 656 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 657 msqkptr = &msqids[msqid]; 658 if (msqkptr->u.msg_qbytes != 0 && 659 msqkptr->cred != NULL && 660 msqkptr->cred->cr_prison == cred->cr_prison && 661 msqkptr->u.msg_perm.key == key) 662 break; 663 } 664 if (msqid < msginfo.msgmni) { 665 DPRINTF(("found public key\n")); 666 if ((msgflg & IPC_CREAT) && (msgflg & IPC_EXCL)) { 667 DPRINTF(("not exclusive\n")); 668 error = EEXIST; 669 goto done2; 670 } 671 AUDIT_ARG_SVIPC_ID(IXSEQ_TO_IPCID(msqid, 672 msqkptr->u.msg_perm)); 673 if ((error = ipcperm(td, &msqkptr->u.msg_perm, 674 msgflg & 0700))) { 675 DPRINTF(("requester doesn't have 0%o access\n", 676 msgflg & 0700)); 677 goto done2; 678 } 679 #ifdef MAC 680 error = mac_sysvmsq_check_msqget(cred, msqkptr); 681 if (error != 0) 682 goto done2; 683 #endif 684 goto found; 685 } 686 } 687 688 DPRINTF(("need to allocate the msqid_ds\n")); 689 if (key == IPC_PRIVATE || (msgflg & IPC_CREAT)) { 690 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 691 /* 692 * Look for an unallocated and unlocked msqid_ds. 693 * msqid_ds's can be locked by msgsnd or msgrcv while 694 * they are copying the message in/out. We can't 695 * re-use the entry until they release it. 696 */ 697 msqkptr = &msqids[msqid]; 698 if (msqkptr->u.msg_qbytes == 0 && 699 (msqkptr->u.msg_perm.mode & MSG_LOCKED) == 0) 700 break; 701 } 702 if (msqid == msginfo.msgmni) { 703 DPRINTF(("no more msqid_ds's available\n")); 704 error = ENOSPC; 705 goto done2; 706 } 707 #ifdef RACCT 708 if (racct_enable) { 709 PROC_LOCK(td->td_proc); 710 error = racct_add(td->td_proc, RACCT_NMSGQ, 1); 711 PROC_UNLOCK(td->td_proc); 712 if (error != 0) { 713 error = ENOSPC; 714 goto done2; 715 } 716 } 717 #endif 718 DPRINTF(("msqid %d is available\n", msqid)); 719 msqkptr->u.msg_perm.key = key; 720 msqkptr->u.msg_perm.cuid = cred->cr_uid; 721 msqkptr->u.msg_perm.uid = cred->cr_uid; 722 msqkptr->u.msg_perm.cgid = cred->cr_gid; 723 msqkptr->u.msg_perm.gid = cred->cr_gid; 724 msqkptr->u.msg_perm.mode = (msgflg & 0777); 725 msqkptr->cred = crhold(cred); 726 /* Make sure that the returned msqid is unique */ 727 msqkptr->u.msg_perm.seq = (msqkptr->u.msg_perm.seq + 1) & 0x7fff; 728 msqkptr->u.__msg_first = NULL; 729 msqkptr->u.__msg_last = NULL; 730 msqkptr->u.msg_cbytes = 0; 731 msqkptr->u.msg_qnum = 0; 732 msqkptr->u.msg_qbytes = msginfo.msgmnb; 733 msqkptr->u.msg_lspid = 0; 734 msqkptr->u.msg_lrpid = 0; 735 msqkptr->u.msg_stime = 0; 736 msqkptr->u.msg_rtime = 0; 737 msqkptr->u.msg_ctime = time_second; 738 #ifdef MAC 739 mac_sysvmsq_create(cred, msqkptr); 740 #endif 741 AUDIT_ARG_SVIPC_PERM(&msqkptr->u.msg_perm); 742 } else { 743 DPRINTF(("didn't find it and wasn't asked to create it\n")); 744 error = ENOENT; 745 goto done2; 746 } 747 748 found: 749 /* Construct the unique msqid */ 750 td->td_retval[0] = IXSEQ_TO_IPCID(msqid, msqkptr->u.msg_perm); 751 done2: 752 mtx_unlock(&msq_mtx); 753 return (error); 754 } 755 756 #ifndef _SYS_SYSPROTO_H_ 757 struct msgsnd_args { 758 int msqid; 759 const void *msgp; /* XXX msgp is actually mtext. */ 760 size_t msgsz; 761 int msgflg; 762 }; 763 #endif 764 int 765 kern_msgsnd(struct thread *td, int msqid, const void *msgp, 766 size_t msgsz, int msgflg, long mtype) 767 { 768 int msqix, segs_needed, error = 0; 769 struct msqid_kernel *msqkptr; 770 struct msg *msghdr; 771 struct prison *rpr; 772 short next; 773 #ifdef RACCT 774 size_t saved_msgsz = 0; 775 #endif 776 777 rpr = msg_find_prison(td->td_ucred); 778 if (rpr == NULL) 779 return (ENOSYS); 780 781 mtx_lock(&msq_mtx); 782 AUDIT_ARG_SVIPC_ID(msqid); 783 msqix = IPCID_TO_IX(msqid); 784 785 if (msqix < 0 || msqix >= msginfo.msgmni) { 786 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 787 msginfo.msgmni)); 788 error = EINVAL; 789 goto done2; 790 } 791 792 msqkptr = &msqids[msqix]; 793 AUDIT_ARG_SVIPC_PERM(&msqkptr->u.msg_perm); 794 if (msqkptr->u.msg_qbytes == 0) { 795 DPRINTF(("no such message queue id\n")); 796 error = EINVAL; 797 goto done2; 798 } 799 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 800 DPRINTF(("wrong sequence number\n")); 801 error = EINVAL; 802 goto done2; 803 } 804 805 if ((error = msq_prison_cansee(rpr, msqkptr))) { 806 DPRINTF(("requester can't see prison\n")); 807 goto done2; 808 } 809 810 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_W))) { 811 DPRINTF(("requester doesn't have write access\n")); 812 goto done2; 813 } 814 815 #ifdef MAC 816 error = mac_sysvmsq_check_msqsnd(td->td_ucred, msqkptr); 817 if (error != 0) 818 goto done2; 819 #endif 820 821 #ifdef RACCT 822 if (racct_enable) { 823 PROC_LOCK(td->td_proc); 824 if (racct_add(td->td_proc, RACCT_MSGQQUEUED, 1)) { 825 PROC_UNLOCK(td->td_proc); 826 error = EAGAIN; 827 goto done2; 828 } 829 saved_msgsz = msgsz; 830 if (racct_add(td->td_proc, RACCT_MSGQSIZE, msgsz)) { 831 racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1); 832 PROC_UNLOCK(td->td_proc); 833 error = EAGAIN; 834 goto done2; 835 } 836 PROC_UNLOCK(td->td_proc); 837 } 838 #endif 839 840 segs_needed = howmany(msgsz, msginfo.msgssz); 841 DPRINTF(("msgsz=%zu, msgssz=%d, segs_needed=%d\n", msgsz, 842 msginfo.msgssz, segs_needed)); 843 for (;;) { 844 int need_more_resources = 0; 845 846 /* 847 * check msgsz 848 * (inside this loop in case msg_qbytes changes while we sleep) 849 */ 850 851 if (msgsz > msqkptr->u.msg_qbytes) { 852 DPRINTF(("msgsz > msqkptr->u.msg_qbytes\n")); 853 error = EINVAL; 854 goto done3; 855 } 856 857 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) { 858 DPRINTF(("msqid is locked\n")); 859 need_more_resources = 1; 860 } 861 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) { 862 DPRINTF(("msgsz + msg_cbytes > msg_qbytes\n")); 863 need_more_resources = 1; 864 } 865 if (segs_needed > nfree_msgmaps) { 866 DPRINTF(("segs_needed > nfree_msgmaps\n")); 867 need_more_resources = 1; 868 } 869 if (free_msghdrs == NULL) { 870 DPRINTF(("no more msghdrs\n")); 871 need_more_resources = 1; 872 } 873 874 if (need_more_resources) { 875 int we_own_it; 876 877 if ((msgflg & IPC_NOWAIT) != 0) { 878 DPRINTF(("need more resources but caller " 879 "doesn't want to wait\n")); 880 error = EAGAIN; 881 goto done3; 882 } 883 884 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) { 885 DPRINTF(("we don't own the msqid_ds\n")); 886 we_own_it = 0; 887 } else { 888 /* Force later arrivals to wait for our 889 request */ 890 DPRINTF(("we own the msqid_ds\n")); 891 msqkptr->u.msg_perm.mode |= MSG_LOCKED; 892 we_own_it = 1; 893 } 894 DPRINTF(("msgsnd: goodnight\n")); 895 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH, 896 "msgsnd", hz); 897 DPRINTF(("msgsnd: good morning, error=%d\n", error)); 898 if (we_own_it) 899 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 900 if (error == EWOULDBLOCK) { 901 DPRINTF(("msgsnd: timed out\n")); 902 continue; 903 } 904 if (error != 0) { 905 DPRINTF(("msgsnd: interrupted system call\n")); 906 error = EINTR; 907 goto done3; 908 } 909 910 /* 911 * Make sure that the msq queue still exists 912 */ 913 914 if (msqkptr->u.msg_qbytes == 0) { 915 DPRINTF(("msqid deleted\n")); 916 error = EIDRM; 917 goto done3; 918 } 919 920 } else { 921 DPRINTF(("got all the resources that we need\n")); 922 break; 923 } 924 } 925 926 /* 927 * We have the resources that we need. 928 * Make sure! 929 */ 930 931 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) 932 panic("msg_perm.mode & MSG_LOCKED"); 933 if (segs_needed > nfree_msgmaps) 934 panic("segs_needed > nfree_msgmaps"); 935 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) 936 panic("msgsz + msg_cbytes > msg_qbytes"); 937 if (free_msghdrs == NULL) 938 panic("no more msghdrs"); 939 940 /* 941 * Re-lock the msqid_ds in case we page-fault when copying in the 942 * message 943 */ 944 945 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) 946 panic("msqid_ds is already locked"); 947 msqkptr->u.msg_perm.mode |= MSG_LOCKED; 948 949 /* 950 * Allocate a message header 951 */ 952 953 msghdr = free_msghdrs; 954 free_msghdrs = msghdr->msg_next; 955 msghdr->msg_spot = -1; 956 msghdr->msg_ts = msgsz; 957 msghdr->msg_type = mtype; 958 #ifdef MAC 959 /* 960 * XXXMAC: Should the mac_sysvmsq_check_msgmsq check follow here 961 * immediately? Or, should it be checked just before the msg is 962 * enqueued in the msgq (as it is done now)? 963 */ 964 mac_sysvmsg_create(td->td_ucred, msqkptr, msghdr); 965 #endif 966 967 /* 968 * Allocate space for the message 969 */ 970 971 while (segs_needed > 0) { 972 if (nfree_msgmaps <= 0) 973 panic("not enough msgmaps"); 974 if (free_msgmaps == -1) 975 panic("nil free_msgmaps"); 976 next = free_msgmaps; 977 if (next <= -1) 978 panic("next too low #1"); 979 if (next >= msginfo.msgseg) 980 panic("next out of range #1"); 981 DPRINTF(("allocating segment %d to message\n", next)); 982 free_msgmaps = msgmaps[next].next; 983 nfree_msgmaps--; 984 msgmaps[next].next = msghdr->msg_spot; 985 msghdr->msg_spot = next; 986 segs_needed--; 987 } 988 989 /* 990 * Validate the message type 991 */ 992 993 if (msghdr->msg_type < 1) { 994 msg_freehdr(msghdr); 995 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 996 wakeup(msqkptr); 997 DPRINTF(("mtype (%ld) < 1\n", msghdr->msg_type)); 998 error = EINVAL; 999 goto done3; 1000 } 1001 1002 /* 1003 * Copy in the message body 1004 */ 1005 1006 next = msghdr->msg_spot; 1007 while (msgsz > 0) { 1008 size_t tlen; 1009 if (msgsz > msginfo.msgssz) 1010 tlen = msginfo.msgssz; 1011 else 1012 tlen = msgsz; 1013 if (next <= -1) 1014 panic("next too low #2"); 1015 if (next >= msginfo.msgseg) 1016 panic("next out of range #2"); 1017 mtx_unlock(&msq_mtx); 1018 if ((error = copyin(msgp, &msgpool[next * msginfo.msgssz], 1019 tlen)) != 0) { 1020 mtx_lock(&msq_mtx); 1021 DPRINTF(("error %d copying in message segment\n", 1022 error)); 1023 msg_freehdr(msghdr); 1024 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 1025 wakeup(msqkptr); 1026 goto done3; 1027 } 1028 mtx_lock(&msq_mtx); 1029 msgsz -= tlen; 1030 msgp = (const char *)msgp + tlen; 1031 next = msgmaps[next].next; 1032 } 1033 if (next != -1) 1034 panic("didn't use all the msg segments"); 1035 1036 /* 1037 * We've got the message. Unlock the msqid_ds. 1038 */ 1039 1040 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 1041 1042 /* 1043 * Make sure that the msqid_ds is still allocated. 1044 */ 1045 1046 if (msqkptr->u.msg_qbytes == 0) { 1047 msg_freehdr(msghdr); 1048 wakeup(msqkptr); 1049 error = EIDRM; 1050 goto done3; 1051 } 1052 1053 #ifdef MAC 1054 /* 1055 * Note: Since the task/thread allocates the msghdr and usually 1056 * primes it with its own MAC label, for a majority of policies, it 1057 * won't be necessary to check whether the msghdr has access 1058 * permissions to the msgq. The mac_sysvmsq_check_msqsnd check would 1059 * suffice in that case. However, this hook may be required where 1060 * individual policies derive a non-identical label for the msghdr 1061 * from the current thread label and may want to check the msghdr 1062 * enqueue permissions, along with read/write permissions to the 1063 * msgq. 1064 */ 1065 error = mac_sysvmsq_check_msgmsq(td->td_ucred, msghdr, msqkptr); 1066 if (error != 0) { 1067 msg_freehdr(msghdr); 1068 wakeup(msqkptr); 1069 goto done3; 1070 } 1071 #endif 1072 1073 /* 1074 * Put the message into the queue 1075 */ 1076 if (msqkptr->u.__msg_first == NULL) { 1077 msqkptr->u.__msg_first = msghdr; 1078 msqkptr->u.__msg_last = msghdr; 1079 } else { 1080 msqkptr->u.__msg_last->msg_next = msghdr; 1081 msqkptr->u.__msg_last = msghdr; 1082 } 1083 msqkptr->u.__msg_last->msg_next = NULL; 1084 1085 msqkptr->u.msg_cbytes += msghdr->msg_ts; 1086 msqkptr->u.msg_qnum++; 1087 msqkptr->u.msg_lspid = td->td_proc->p_pid; 1088 msqkptr->u.msg_stime = time_second; 1089 1090 wakeup(msqkptr); 1091 td->td_retval[0] = 0; 1092 done3: 1093 #ifdef RACCT 1094 if (racct_enable && error != 0) { 1095 PROC_LOCK(td->td_proc); 1096 racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1); 1097 racct_sub(td->td_proc, RACCT_MSGQSIZE, saved_msgsz); 1098 PROC_UNLOCK(td->td_proc); 1099 } 1100 #endif 1101 done2: 1102 mtx_unlock(&msq_mtx); 1103 return (error); 1104 } 1105 1106 int 1107 sys_msgsnd(struct thread *td, struct msgsnd_args *uap) 1108 { 1109 int error; 1110 long mtype; 1111 1112 DPRINTF(("call to msgsnd(%d, %p, %zu, %d)\n", uap->msqid, uap->msgp, 1113 uap->msgsz, uap->msgflg)); 1114 1115 if ((error = copyin(uap->msgp, &mtype, sizeof(mtype))) != 0) { 1116 DPRINTF(("error %d copying the message type\n", error)); 1117 return (error); 1118 } 1119 return (kern_msgsnd(td, uap->msqid, 1120 (const char *)uap->msgp + sizeof(mtype), 1121 uap->msgsz, uap->msgflg, mtype)); 1122 } 1123 1124 #ifndef _SYS_SYSPROTO_H_ 1125 struct msgrcv_args { 1126 int msqid; 1127 void *msgp; 1128 size_t msgsz; 1129 long msgtyp; 1130 int msgflg; 1131 }; 1132 #endif 1133 /* XXX msgp is actually mtext. */ 1134 int 1135 kern_msgrcv(struct thread *td, int msqid, void *msgp, size_t msgsz, long msgtyp, 1136 int msgflg, long *mtype) 1137 { 1138 size_t len; 1139 struct msqid_kernel *msqkptr; 1140 struct msg *msghdr; 1141 struct prison *rpr; 1142 int msqix, error = 0; 1143 short next; 1144 1145 rpr = msg_find_prison(td->td_ucred); 1146 if (rpr == NULL) 1147 return (ENOSYS); 1148 1149 AUDIT_ARG_SVIPC_ID(msqid); 1150 msqix = IPCID_TO_IX(msqid); 1151 1152 if (msqix < 0 || msqix >= msginfo.msgmni) { 1153 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 1154 msginfo.msgmni)); 1155 return (EINVAL); 1156 } 1157 1158 msqkptr = &msqids[msqix]; 1159 mtx_lock(&msq_mtx); 1160 AUDIT_ARG_SVIPC_PERM(&msqkptr->u.msg_perm); 1161 if (msqkptr->u.msg_qbytes == 0) { 1162 DPRINTF(("no such message queue id\n")); 1163 error = EINVAL; 1164 goto done2; 1165 } 1166 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 1167 DPRINTF(("wrong sequence number\n")); 1168 error = EINVAL; 1169 goto done2; 1170 } 1171 1172 if ((error = msq_prison_cansee(rpr, msqkptr))) { 1173 DPRINTF(("requester can't see prison\n")); 1174 goto done2; 1175 } 1176 1177 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) { 1178 DPRINTF(("requester doesn't have read access\n")); 1179 goto done2; 1180 } 1181 1182 #ifdef MAC 1183 error = mac_sysvmsq_check_msqrcv(td->td_ucred, msqkptr); 1184 if (error != 0) 1185 goto done2; 1186 #endif 1187 1188 msghdr = NULL; 1189 while (msghdr == NULL) { 1190 if (msgtyp == 0) { 1191 msghdr = msqkptr->u.__msg_first; 1192 if (msghdr != NULL) { 1193 if (msgsz < msghdr->msg_ts && 1194 (msgflg & MSG_NOERROR) == 0) { 1195 DPRINTF(("first message on the queue " 1196 "is too big (want %zu, got %d)\n", 1197 msgsz, msghdr->msg_ts)); 1198 error = E2BIG; 1199 goto done2; 1200 } 1201 #ifdef MAC 1202 error = mac_sysvmsq_check_msgrcv(td->td_ucred, 1203 msghdr); 1204 if (error != 0) 1205 goto done2; 1206 #endif 1207 if (msqkptr->u.__msg_first == 1208 msqkptr->u.__msg_last) { 1209 msqkptr->u.__msg_first = NULL; 1210 msqkptr->u.__msg_last = NULL; 1211 } else { 1212 msqkptr->u.__msg_first = msghdr->msg_next; 1213 if (msqkptr->u.__msg_first == NULL) 1214 panic("msg_first/last screwed up #1"); 1215 } 1216 } 1217 } else { 1218 struct msg *previous; 1219 struct msg **prev; 1220 1221 previous = NULL; 1222 prev = &(msqkptr->u.__msg_first); 1223 while ((msghdr = *prev) != NULL) { 1224 /* 1225 * Is this message's type an exact match or is 1226 * this message's type less than or equal to 1227 * the absolute value of a negative msgtyp? 1228 * Note that the second half of this test can 1229 * NEVER be true if msgtyp is positive since 1230 * msg_type is always positive! 1231 */ 1232 1233 if (msgtyp == msghdr->msg_type || 1234 msghdr->msg_type <= -msgtyp) { 1235 DPRINTF(("found message type %ld, " 1236 "requested %ld\n", 1237 msghdr->msg_type, msgtyp)); 1238 if (msgsz < msghdr->msg_ts && 1239 (msgflg & MSG_NOERROR) == 0) { 1240 DPRINTF(("requested message " 1241 "on the queue is too big " 1242 "(want %zu, got %hu)\n", 1243 msgsz, msghdr->msg_ts)); 1244 error = E2BIG; 1245 goto done2; 1246 } 1247 #ifdef MAC 1248 error = mac_sysvmsq_check_msgrcv( 1249 td->td_ucred, msghdr); 1250 if (error != 0) 1251 goto done2; 1252 #endif 1253 *prev = msghdr->msg_next; 1254 if (msghdr == msqkptr->u.__msg_last) { 1255 if (previous == NULL) { 1256 if (prev != 1257 &msqkptr->u.__msg_first) 1258 panic("__msg_first/last screwed up #2"); 1259 msqkptr->u.__msg_first = 1260 NULL; 1261 msqkptr->u.__msg_last = 1262 NULL; 1263 } else { 1264 if (prev == 1265 &msqkptr->u.__msg_first) 1266 panic("__msg_first/last screwed up #3"); 1267 msqkptr->u.__msg_last = 1268 previous; 1269 } 1270 } 1271 break; 1272 } 1273 previous = msghdr; 1274 prev = &(msghdr->msg_next); 1275 } 1276 } 1277 1278 /* 1279 * We've either extracted the msghdr for the appropriate 1280 * message or there isn't one. 1281 * If there is one then bail out of this loop. 1282 */ 1283 1284 if (msghdr != NULL) 1285 break; 1286 1287 /* 1288 * Hmph! No message found. Does the user want to wait? 1289 */ 1290 1291 if ((msgflg & IPC_NOWAIT) != 0) { 1292 DPRINTF(("no appropriate message found (msgtyp=%ld)\n", 1293 msgtyp)); 1294 /* The SVID says to return ENOMSG. */ 1295 error = ENOMSG; 1296 goto done2; 1297 } 1298 1299 /* 1300 * Wait for something to happen 1301 */ 1302 1303 DPRINTF(("msgrcv: goodnight\n")); 1304 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH, 1305 "msgrcv", 0); 1306 DPRINTF(("msgrcv: good morning (error=%d)\n", error)); 1307 1308 if (error != 0) { 1309 DPRINTF(("msgrcv: interrupted system call\n")); 1310 error = EINTR; 1311 goto done2; 1312 } 1313 1314 /* 1315 * Make sure that the msq queue still exists 1316 */ 1317 1318 if (msqkptr->u.msg_qbytes == 0 || 1319 msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 1320 DPRINTF(("msqid deleted\n")); 1321 error = EIDRM; 1322 goto done2; 1323 } 1324 } 1325 1326 /* 1327 * Return the message to the user. 1328 * 1329 * First, do the bookkeeping (before we risk being interrupted). 1330 */ 1331 1332 msqkptr->u.msg_cbytes -= msghdr->msg_ts; 1333 msqkptr->u.msg_qnum--; 1334 msqkptr->u.msg_lrpid = td->td_proc->p_pid; 1335 msqkptr->u.msg_rtime = time_second; 1336 1337 racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, 1); 1338 racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msghdr->msg_ts); 1339 1340 /* 1341 * Make msgsz the actual amount that we'll be returning. 1342 * Note that this effectively truncates the message if it is too long 1343 * (since msgsz is never increased). 1344 */ 1345 1346 DPRINTF(("found a message, msgsz=%zu, msg_ts=%hu\n", msgsz, 1347 msghdr->msg_ts)); 1348 if (msgsz > msghdr->msg_ts) 1349 msgsz = msghdr->msg_ts; 1350 *mtype = msghdr->msg_type; 1351 1352 /* 1353 * Return the segments to the user 1354 */ 1355 1356 next = msghdr->msg_spot; 1357 for (len = 0; len < msgsz; len += msginfo.msgssz) { 1358 size_t tlen; 1359 1360 if (msgsz - len > msginfo.msgssz) 1361 tlen = msginfo.msgssz; 1362 else 1363 tlen = msgsz - len; 1364 if (next <= -1) 1365 panic("next too low #3"); 1366 if (next >= msginfo.msgseg) 1367 panic("next out of range #3"); 1368 mtx_unlock(&msq_mtx); 1369 error = copyout(&msgpool[next * msginfo.msgssz], msgp, tlen); 1370 mtx_lock(&msq_mtx); 1371 if (error != 0) { 1372 DPRINTF(("error (%d) copying out message segment\n", 1373 error)); 1374 msg_freehdr(msghdr); 1375 wakeup(msqkptr); 1376 goto done2; 1377 } 1378 msgp = (char *)msgp + tlen; 1379 next = msgmaps[next].next; 1380 } 1381 1382 /* 1383 * Done, return the actual number of bytes copied out. 1384 */ 1385 1386 msg_freehdr(msghdr); 1387 wakeup(msqkptr); 1388 td->td_retval[0] = msgsz; 1389 done2: 1390 mtx_unlock(&msq_mtx); 1391 return (error); 1392 } 1393 1394 int 1395 sys_msgrcv(struct thread *td, struct msgrcv_args *uap) 1396 { 1397 int error; 1398 long mtype; 1399 1400 DPRINTF(("call to msgrcv(%d, %p, %zu, %ld, %d)\n", uap->msqid, 1401 uap->msgp, uap->msgsz, uap->msgtyp, uap->msgflg)); 1402 1403 if ((error = kern_msgrcv(td, uap->msqid, 1404 (char *)uap->msgp + sizeof(mtype), uap->msgsz, 1405 uap->msgtyp, uap->msgflg, &mtype)) != 0) 1406 return (error); 1407 if ((error = copyout(&mtype, uap->msgp, sizeof(mtype))) != 0) 1408 DPRINTF(("error %d copying the message type\n", error)); 1409 return (error); 1410 } 1411 1412 static int 1413 sysctl_msqids(SYSCTL_HANDLER_ARGS) 1414 { 1415 struct msqid_kernel tmsqk; 1416 #ifdef COMPAT_FREEBSD32 1417 struct msqid_kernel32 tmsqk32; 1418 #endif 1419 struct prison *pr, *rpr; 1420 void *outaddr; 1421 size_t outsize; 1422 int error, i; 1423 1424 pr = req->td->td_ucred->cr_prison; 1425 rpr = msg_find_prison(req->td->td_ucred); 1426 error = 0; 1427 for (i = 0; i < msginfo.msgmni; i++) { 1428 mtx_lock(&msq_mtx); 1429 if (msqids[i].u.msg_qbytes == 0 || rpr == NULL || 1430 msq_prison_cansee(rpr, &msqids[i]) != 0) 1431 bzero(&tmsqk, sizeof(tmsqk)); 1432 else { 1433 tmsqk = msqids[i]; 1434 if (tmsqk.cred->cr_prison != pr) 1435 tmsqk.u.msg_perm.key = IPC_PRIVATE; 1436 } 1437 mtx_unlock(&msq_mtx); 1438 #ifdef COMPAT_FREEBSD32 1439 if (SV_CURPROC_FLAG(SV_ILP32)) { 1440 bzero(&tmsqk32, sizeof(tmsqk32)); 1441 freebsd32_ipcperm_out(&tmsqk.u.msg_perm, 1442 &tmsqk32.u.msg_perm); 1443 /* Don't copy u.msg_first or u.msg_last */ 1444 CP(tmsqk, tmsqk32, u.msg_cbytes); 1445 CP(tmsqk, tmsqk32, u.msg_qnum); 1446 CP(tmsqk, tmsqk32, u.msg_qbytes); 1447 CP(tmsqk, tmsqk32, u.msg_lspid); 1448 CP(tmsqk, tmsqk32, u.msg_lrpid); 1449 CP(tmsqk, tmsqk32, u.msg_stime); 1450 CP(tmsqk, tmsqk32, u.msg_rtime); 1451 CP(tmsqk, tmsqk32, u.msg_ctime); 1452 /* Don't copy label or cred */ 1453 outaddr = &tmsqk32; 1454 outsize = sizeof(tmsqk32); 1455 } else 1456 #endif 1457 { 1458 /* Don't leak kernel pointers */ 1459 tmsqk.u.__msg_first = NULL; 1460 tmsqk.u.__msg_last = NULL; 1461 tmsqk.label = NULL; 1462 tmsqk.cred = NULL; 1463 /* 1464 * XXX: some padding also exists, but we take care to 1465 * allocate our pool of msqid_kernel structs with 1466 * zeroed memory so this should be OK. 1467 */ 1468 outaddr = &tmsqk; 1469 outsize = sizeof(tmsqk); 1470 } 1471 error = SYSCTL_OUT(req, outaddr, outsize); 1472 if (error != 0) 1473 break; 1474 } 1475 return (error); 1476 } 1477 1478 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmax, CTLFLAG_RD, &msginfo.msgmax, 0, 1479 "Maximum message size"); 1480 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmni, CTLFLAG_RDTUN, &msginfo.msgmni, 0, 1481 "Number of message queue identifiers"); 1482 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmnb, CTLFLAG_RDTUN, &msginfo.msgmnb, 0, 1483 "Maximum number of bytes in a queue"); 1484 SYSCTL_INT(_kern_ipc, OID_AUTO, msgtql, CTLFLAG_RDTUN, &msginfo.msgtql, 0, 1485 "Maximum number of messages in the system"); 1486 SYSCTL_INT(_kern_ipc, OID_AUTO, msgssz, CTLFLAG_RDTUN, &msginfo.msgssz, 0, 1487 "Size of a message segment"); 1488 SYSCTL_INT(_kern_ipc, OID_AUTO, msgseg, CTLFLAG_RDTUN, &msginfo.msgseg, 0, 1489 "Number of message segments"); 1490 SYSCTL_PROC(_kern_ipc, OID_AUTO, msqids, 1491 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, 1492 NULL, 0, sysctl_msqids, "", 1493 "Array of struct msqid_kernel for each potential message queue"); 1494 1495 static int 1496 msg_prison_check(void *obj, void *data) 1497 { 1498 struct prison *pr = obj; 1499 struct prison *prpr; 1500 struct vfsoptlist *opts = data; 1501 int error, jsys; 1502 1503 /* 1504 * sysvmsg is a jailsys integer. 1505 * It must be "disable" if the parent jail is disabled. 1506 */ 1507 error = vfs_copyopt(opts, "sysvmsg", &jsys, sizeof(jsys)); 1508 if (error != ENOENT) { 1509 if (error != 0) 1510 return (error); 1511 switch (jsys) { 1512 case JAIL_SYS_DISABLE: 1513 break; 1514 case JAIL_SYS_NEW: 1515 case JAIL_SYS_INHERIT: 1516 prison_lock(pr->pr_parent); 1517 prpr = osd_jail_get(pr->pr_parent, msg_prison_slot); 1518 prison_unlock(pr->pr_parent); 1519 if (prpr == NULL) 1520 return (EPERM); 1521 break; 1522 default: 1523 return (EINVAL); 1524 } 1525 } 1526 1527 return (0); 1528 } 1529 1530 static int 1531 msg_prison_set(void *obj, void *data) 1532 { 1533 struct prison *pr = obj; 1534 struct prison *tpr, *orpr, *nrpr, *trpr; 1535 struct vfsoptlist *opts = data; 1536 void *rsv; 1537 int jsys, descend; 1538 1539 /* 1540 * sysvmsg controls which jail is the root of the associated msgs (this 1541 * jail or same as the parent), or if the feature is available at all. 1542 */ 1543 if (vfs_copyopt(opts, "sysvmsg", &jsys, sizeof(jsys)) == ENOENT) 1544 jsys = vfs_flagopt(opts, "allow.sysvipc", NULL, 0) 1545 ? JAIL_SYS_INHERIT 1546 : vfs_flagopt(opts, "allow.nosysvipc", NULL, 0) 1547 ? JAIL_SYS_DISABLE 1548 : -1; 1549 if (jsys == JAIL_SYS_DISABLE) { 1550 prison_lock(pr); 1551 orpr = osd_jail_get(pr, msg_prison_slot); 1552 if (orpr != NULL) 1553 osd_jail_del(pr, msg_prison_slot); 1554 prison_unlock(pr); 1555 if (orpr != NULL) { 1556 if (orpr == pr) 1557 msg_prison_cleanup(pr); 1558 /* Disable all child jails as well. */ 1559 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1560 prison_lock(tpr); 1561 trpr = osd_jail_get(tpr, msg_prison_slot); 1562 if (trpr != NULL) { 1563 osd_jail_del(tpr, msg_prison_slot); 1564 prison_unlock(tpr); 1565 if (trpr == tpr) 1566 msg_prison_cleanup(tpr); 1567 } else { 1568 prison_unlock(tpr); 1569 descend = 0; 1570 } 1571 } 1572 } 1573 } else if (jsys != -1) { 1574 if (jsys == JAIL_SYS_NEW) 1575 nrpr = pr; 1576 else { 1577 prison_lock(pr->pr_parent); 1578 nrpr = osd_jail_get(pr->pr_parent, msg_prison_slot); 1579 prison_unlock(pr->pr_parent); 1580 } 1581 rsv = osd_reserve(msg_prison_slot); 1582 prison_lock(pr); 1583 orpr = osd_jail_get(pr, msg_prison_slot); 1584 if (orpr != nrpr) 1585 (void)osd_jail_set_reserved(pr, msg_prison_slot, rsv, 1586 nrpr); 1587 else 1588 osd_free_reserved(rsv); 1589 prison_unlock(pr); 1590 if (orpr != nrpr) { 1591 if (orpr == pr) 1592 msg_prison_cleanup(pr); 1593 if (orpr != NULL) { 1594 /* Change child jails matching the old root, */ 1595 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1596 prison_lock(tpr); 1597 trpr = osd_jail_get(tpr, 1598 msg_prison_slot); 1599 if (trpr == orpr) { 1600 (void)osd_jail_set(tpr, 1601 msg_prison_slot, nrpr); 1602 prison_unlock(tpr); 1603 if (trpr == tpr) 1604 msg_prison_cleanup(tpr); 1605 } else { 1606 prison_unlock(tpr); 1607 descend = 0; 1608 } 1609 } 1610 } 1611 } 1612 } 1613 1614 return (0); 1615 } 1616 1617 static int 1618 msg_prison_get(void *obj, void *data) 1619 { 1620 struct prison *pr = obj; 1621 struct prison *rpr; 1622 struct vfsoptlist *opts = data; 1623 int error, jsys; 1624 1625 /* Set sysvmsg based on the jail's root prison. */ 1626 prison_lock(pr); 1627 rpr = osd_jail_get(pr, msg_prison_slot); 1628 prison_unlock(pr); 1629 jsys = rpr == NULL ? JAIL_SYS_DISABLE 1630 : rpr == pr ? JAIL_SYS_NEW : JAIL_SYS_INHERIT; 1631 error = vfs_setopt(opts, "sysvmsg", &jsys, sizeof(jsys)); 1632 if (error == ENOENT) 1633 error = 0; 1634 return (error); 1635 } 1636 1637 static int 1638 msg_prison_remove(void *obj, void *data __unused) 1639 { 1640 struct prison *pr = obj; 1641 struct prison *rpr; 1642 1643 prison_lock(pr); 1644 rpr = osd_jail_get(pr, msg_prison_slot); 1645 prison_unlock(pr); 1646 if (rpr == pr) 1647 msg_prison_cleanup(pr); 1648 return (0); 1649 } 1650 1651 static void 1652 msg_prison_cleanup(struct prison *pr) 1653 { 1654 struct msqid_kernel *msqkptr; 1655 int i; 1656 1657 /* Remove any msqs that belong to this jail. */ 1658 mtx_lock(&msq_mtx); 1659 for (i = 0; i < msginfo.msgmni; i++) { 1660 msqkptr = &msqids[i]; 1661 if (msqkptr->u.msg_qbytes != 0 && 1662 msqkptr->cred != NULL && msqkptr->cred->cr_prison == pr) 1663 msq_remove(msqkptr); 1664 } 1665 mtx_unlock(&msq_mtx); 1666 } 1667 1668 SYSCTL_JAIL_PARAM_SYS_NODE(sysvmsg, CTLFLAG_RW, "SYSV message queues"); 1669 1670 #ifdef COMPAT_FREEBSD32 1671 int 1672 freebsd32_msgsys(struct thread *td, struct freebsd32_msgsys_args *uap) 1673 { 1674 1675 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1676 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1677 AUDIT_ARG_SVIPC_WHICH(uap->which); 1678 switch (uap->which) { 1679 case 0: 1680 return (freebsd7_freebsd32_msgctl(td, 1681 (struct freebsd7_freebsd32_msgctl_args *)&uap->a2)); 1682 case 2: 1683 return (freebsd32_msgsnd(td, 1684 (struct freebsd32_msgsnd_args *)&uap->a2)); 1685 case 3: 1686 return (freebsd32_msgrcv(td, 1687 (struct freebsd32_msgrcv_args *)&uap->a2)); 1688 default: 1689 return (sys_msgsys(td, (struct msgsys_args *)uap)); 1690 } 1691 #else 1692 return (nosys(td, NULL)); 1693 #endif 1694 } 1695 1696 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1697 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1698 int 1699 freebsd7_freebsd32_msgctl(struct thread *td, 1700 struct freebsd7_freebsd32_msgctl_args *uap) 1701 { 1702 struct msqid_ds msqbuf; 1703 struct msqid_ds32_old msqbuf32; 1704 int error; 1705 1706 if (uap->cmd == IPC_SET) { 1707 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32)); 1708 if (error) 1709 return (error); 1710 freebsd32_ipcperm_old_in(&msqbuf32.msg_perm, &msqbuf.msg_perm); 1711 PTRIN_CP(msqbuf32, msqbuf, __msg_first); 1712 PTRIN_CP(msqbuf32, msqbuf, __msg_last); 1713 CP(msqbuf32, msqbuf, msg_cbytes); 1714 CP(msqbuf32, msqbuf, msg_qnum); 1715 CP(msqbuf32, msqbuf, msg_qbytes); 1716 CP(msqbuf32, msqbuf, msg_lspid); 1717 CP(msqbuf32, msqbuf, msg_lrpid); 1718 CP(msqbuf32, msqbuf, msg_stime); 1719 CP(msqbuf32, msqbuf, msg_rtime); 1720 CP(msqbuf32, msqbuf, msg_ctime); 1721 } 1722 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1723 if (error) 1724 return (error); 1725 if (uap->cmd == IPC_STAT) { 1726 bzero(&msqbuf32, sizeof(msqbuf32)); 1727 freebsd32_ipcperm_old_out(&msqbuf.msg_perm, &msqbuf32.msg_perm); 1728 PTROUT_CP(msqbuf, msqbuf32, __msg_first); 1729 PTROUT_CP(msqbuf, msqbuf32, __msg_last); 1730 CP(msqbuf, msqbuf32, msg_cbytes); 1731 CP(msqbuf, msqbuf32, msg_qnum); 1732 CP(msqbuf, msqbuf32, msg_qbytes); 1733 CP(msqbuf, msqbuf32, msg_lspid); 1734 CP(msqbuf, msqbuf32, msg_lrpid); 1735 CP(msqbuf, msqbuf32, msg_stime); 1736 CP(msqbuf, msqbuf32, msg_rtime); 1737 CP(msqbuf, msqbuf32, msg_ctime); 1738 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32)); 1739 } 1740 return (error); 1741 } 1742 #endif 1743 1744 int 1745 freebsd32_msgctl(struct thread *td, struct freebsd32_msgctl_args *uap) 1746 { 1747 struct msqid_ds msqbuf; 1748 struct msqid_ds32 msqbuf32; 1749 int error; 1750 1751 if (uap->cmd == IPC_SET) { 1752 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32)); 1753 if (error) 1754 return (error); 1755 freebsd32_ipcperm_in(&msqbuf32.msg_perm, &msqbuf.msg_perm); 1756 PTRIN_CP(msqbuf32, msqbuf, __msg_first); 1757 PTRIN_CP(msqbuf32, msqbuf, __msg_last); 1758 CP(msqbuf32, msqbuf, msg_cbytes); 1759 CP(msqbuf32, msqbuf, msg_qnum); 1760 CP(msqbuf32, msqbuf, msg_qbytes); 1761 CP(msqbuf32, msqbuf, msg_lspid); 1762 CP(msqbuf32, msqbuf, msg_lrpid); 1763 CP(msqbuf32, msqbuf, msg_stime); 1764 CP(msqbuf32, msqbuf, msg_rtime); 1765 CP(msqbuf32, msqbuf, msg_ctime); 1766 } 1767 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1768 if (error) 1769 return (error); 1770 if (uap->cmd == IPC_STAT) { 1771 freebsd32_ipcperm_out(&msqbuf.msg_perm, &msqbuf32.msg_perm); 1772 PTROUT_CP(msqbuf, msqbuf32, __msg_first); 1773 PTROUT_CP(msqbuf, msqbuf32, __msg_last); 1774 CP(msqbuf, msqbuf32, msg_cbytes); 1775 CP(msqbuf, msqbuf32, msg_qnum); 1776 CP(msqbuf, msqbuf32, msg_qbytes); 1777 CP(msqbuf, msqbuf32, msg_lspid); 1778 CP(msqbuf, msqbuf32, msg_lrpid); 1779 CP(msqbuf, msqbuf32, msg_stime); 1780 CP(msqbuf, msqbuf32, msg_rtime); 1781 CP(msqbuf, msqbuf32, msg_ctime); 1782 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32)); 1783 } 1784 return (error); 1785 } 1786 1787 int 1788 freebsd32_msgsnd(struct thread *td, struct freebsd32_msgsnd_args *uap) 1789 { 1790 const void *msgp; 1791 long mtype; 1792 int32_t mtype32; 1793 int error; 1794 1795 msgp = PTRIN(uap->msgp); 1796 if ((error = copyin(msgp, &mtype32, sizeof(mtype32))) != 0) 1797 return (error); 1798 mtype = mtype32; 1799 return (kern_msgsnd(td, uap->msqid, 1800 (const char *)msgp + sizeof(mtype32), 1801 uap->msgsz, uap->msgflg, mtype)); 1802 } 1803 1804 int 1805 freebsd32_msgrcv(struct thread *td, struct freebsd32_msgrcv_args *uap) 1806 { 1807 void *msgp; 1808 long mtype; 1809 int32_t mtype32; 1810 int error; 1811 1812 msgp = PTRIN(uap->msgp); 1813 if ((error = kern_msgrcv(td, uap->msqid, 1814 (char *)msgp + sizeof(mtype32), uap->msgsz, 1815 uap->msgtyp, uap->msgflg, &mtype)) != 0) 1816 return (error); 1817 mtype32 = (int32_t)mtype; 1818 return (copyout(&mtype32, msgp, sizeof(mtype32))); 1819 } 1820 #endif 1821 1822 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1823 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1824 1825 /* XXX casting to (sy_call_t *) is bogus, as usual. */ 1826 static sy_call_t *msgcalls[] = { 1827 (sy_call_t *)freebsd7_msgctl, (sy_call_t *)sys_msgget, 1828 (sy_call_t *)sys_msgsnd, (sy_call_t *)sys_msgrcv 1829 }; 1830 1831 /* 1832 * Entry point for all MSG calls. 1833 * 1834 * XXX actually varargs. 1835 * struct msgsys_args { 1836 * int which; 1837 * int a2; 1838 * int a3; 1839 * int a4; 1840 * int a5; 1841 * int a6; 1842 * } *uap; 1843 */ 1844 int 1845 sys_msgsys(struct thread *td, struct msgsys_args *uap) 1846 { 1847 int error; 1848 1849 AUDIT_ARG_SVIPC_WHICH(uap->which); 1850 if (uap->which < 0 || uap->which >= nitems(msgcalls)) 1851 return (EINVAL); 1852 error = (*msgcalls[uap->which])(td, &uap->a2); 1853 return (error); 1854 } 1855 1856 #ifndef CP 1857 #define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0) 1858 #endif 1859 1860 #ifndef _SYS_SYSPROTO_H_ 1861 struct freebsd7_msgctl_args { 1862 int msqid; 1863 int cmd; 1864 struct msqid_ds_old *buf; 1865 }; 1866 #endif 1867 int 1868 freebsd7_msgctl(struct thread *td, struct freebsd7_msgctl_args *uap) 1869 { 1870 struct msqid_ds_old msqold; 1871 struct msqid_ds msqbuf; 1872 int error; 1873 1874 DPRINTF(("call to freebsd7_msgctl(%d, %d, %p)\n", uap->msqid, uap->cmd, 1875 uap->buf)); 1876 if (uap->cmd == IPC_SET) { 1877 error = copyin(uap->buf, &msqold, sizeof(msqold)); 1878 if (error) 1879 return (error); 1880 ipcperm_old2new(&msqold.msg_perm, &msqbuf.msg_perm); 1881 CP(msqold, msqbuf, __msg_first); 1882 CP(msqold, msqbuf, __msg_last); 1883 CP(msqold, msqbuf, msg_cbytes); 1884 CP(msqold, msqbuf, msg_qnum); 1885 CP(msqold, msqbuf, msg_qbytes); 1886 CP(msqold, msqbuf, msg_lspid); 1887 CP(msqold, msqbuf, msg_lrpid); 1888 CP(msqold, msqbuf, msg_stime); 1889 CP(msqold, msqbuf, msg_rtime); 1890 CP(msqold, msqbuf, msg_ctime); 1891 } 1892 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1893 if (error) 1894 return (error); 1895 if (uap->cmd == IPC_STAT) { 1896 bzero(&msqold, sizeof(msqold)); 1897 ipcperm_new2old(&msqbuf.msg_perm, &msqold.msg_perm); 1898 CP(msqbuf, msqold, __msg_first); 1899 CP(msqbuf, msqold, __msg_last); 1900 CP(msqbuf, msqold, msg_cbytes); 1901 CP(msqbuf, msqold, msg_qnum); 1902 CP(msqbuf, msqold, msg_qbytes); 1903 CP(msqbuf, msqold, msg_lspid); 1904 CP(msqbuf, msqold, msg_lrpid); 1905 CP(msqbuf, msqold, msg_stime); 1906 CP(msqbuf, msqold, msg_rtime); 1907 CP(msqbuf, msqold, msg_ctime); 1908 error = copyout(&msqold, uap->buf, sizeof(struct msqid_ds_old)); 1909 } 1910 return (error); 1911 } 1912 1913 #undef CP 1914 1915 #endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 || 1916 COMPAT_FREEBSD7 */
Cache object: bb442d7865b10f5bab6ef07bb2f8660f
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