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 *); 101 102 103 #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(msghdr) 390 struct msg *msghdr; 391 { 392 while (msghdr->msg_ts > 0) { 393 short next; 394 if (msghdr->msg_spot < 0 || msghdr->msg_spot >= msginfo.msgseg) 395 panic("msghdr->msg_spot out of range"); 396 next = msgmaps[msghdr->msg_spot].next; 397 msgmaps[msghdr->msg_spot].next = free_msgmaps; 398 free_msgmaps = msghdr->msg_spot; 399 nfree_msgmaps++; 400 msghdr->msg_spot = next; 401 if (msghdr->msg_ts >= msginfo.msgssz) 402 msghdr->msg_ts -= msginfo.msgssz; 403 else 404 msghdr->msg_ts = 0; 405 } 406 if (msghdr->msg_spot != -1) 407 panic("msghdr->msg_spot != -1"); 408 msghdr->msg_next = free_msghdrs; 409 free_msghdrs = msghdr; 410 #ifdef MAC 411 mac_sysvmsg_cleanup(msghdr); 412 #endif 413 } 414 415 static void 416 msq_remove(struct msqid_kernel *msqkptr) 417 { 418 struct msg *msghdr; 419 420 racct_sub_cred(msqkptr->cred, RACCT_NMSGQ, 1); 421 racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, msqkptr->u.msg_qnum); 422 racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msqkptr->u.msg_cbytes); 423 crfree(msqkptr->cred); 424 msqkptr->cred = NULL; 425 426 /* Free the message headers */ 427 msghdr = msqkptr->u.__msg_first; 428 while (msghdr != NULL) { 429 struct msg *msghdr_tmp; 430 431 /* Free the segments of each message */ 432 msqkptr->u.msg_cbytes -= msghdr->msg_ts; 433 msqkptr->u.msg_qnum--; 434 msghdr_tmp = msghdr; 435 msghdr = msghdr->msg_next; 436 msg_freehdr(msghdr_tmp); 437 } 438 439 if (msqkptr->u.msg_cbytes != 0) 440 panic("msg_cbytes is screwed up"); 441 if (msqkptr->u.msg_qnum != 0) 442 panic("msg_qnum is screwed up"); 443 444 msqkptr->u.msg_qbytes = 0; /* Mark it as free */ 445 446 #ifdef MAC 447 mac_sysvmsq_cleanup(msqkptr); 448 #endif 449 450 wakeup(msqkptr); 451 } 452 453 static struct prison * 454 msg_find_prison(struct ucred *cred) 455 { 456 struct prison *pr, *rpr; 457 458 pr = cred->cr_prison; 459 prison_lock(pr); 460 rpr = osd_jail_get(pr, msg_prison_slot); 461 prison_unlock(pr); 462 return rpr; 463 } 464 465 static int 466 msq_prison_cansee(struct prison *rpr, struct msqid_kernel *msqkptr) 467 { 468 469 if (msqkptr->cred == NULL || 470 !(rpr == msqkptr->cred->cr_prison || 471 prison_ischild(rpr, msqkptr->cred->cr_prison))) 472 return (EINVAL); 473 return (0); 474 } 475 476 #ifndef _SYS_SYSPROTO_H_ 477 struct msgctl_args { 478 int msqid; 479 int cmd; 480 struct msqid_ds *buf; 481 }; 482 #endif 483 int 484 sys_msgctl(struct thread *td, struct msgctl_args *uap) 485 { 486 int msqid = uap->msqid; 487 int cmd = uap->cmd; 488 struct msqid_ds msqbuf; 489 int error; 490 491 DPRINTF(("call to msgctl(%d, %d, %p)\n", msqid, cmd, uap->buf)); 492 if (cmd == IPC_SET && 493 (error = copyin(uap->buf, &msqbuf, sizeof(msqbuf))) != 0) 494 return (error); 495 error = kern_msgctl(td, msqid, cmd, &msqbuf); 496 if (cmd == IPC_STAT && error == 0) 497 error = copyout(&msqbuf, uap->buf, sizeof(struct msqid_ds)); 498 return (error); 499 } 500 501 int 502 kern_msgctl(td, msqid, cmd, msqbuf) 503 struct thread *td; 504 int msqid; 505 int cmd; 506 struct msqid_ds *msqbuf; 507 { 508 int rval, error, msqix; 509 struct msqid_kernel *msqkptr; 510 struct prison *rpr; 511 512 rpr = msg_find_prison(td->td_ucred); 513 if (rpr == NULL) 514 return (ENOSYS); 515 516 AUDIT_ARG_SVIPC_CMD(cmd); 517 AUDIT_ARG_SVIPC_ID(msqid); 518 msqix = IPCID_TO_IX(msqid); 519 520 if (msqix < 0 || msqix >= msginfo.msgmni) { 521 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 522 msginfo.msgmni)); 523 return (EINVAL); 524 } 525 526 msqkptr = &msqids[msqix]; 527 528 mtx_lock(&msq_mtx); 529 if (msqkptr->u.msg_qbytes == 0) { 530 DPRINTF(("no such msqid\n")); 531 error = EINVAL; 532 goto done2; 533 } 534 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 535 DPRINTF(("wrong sequence number\n")); 536 error = EINVAL; 537 goto done2; 538 } 539 540 error = msq_prison_cansee(rpr, msqkptr); 541 if (error != 0) { 542 DPRINTF(("requester can't see prison\n")); 543 goto done2; 544 } 545 546 #ifdef MAC 547 error = mac_sysvmsq_check_msqctl(td->td_ucred, msqkptr, cmd); 548 if (error != 0) 549 goto done2; 550 #endif 551 552 error = 0; 553 rval = 0; 554 555 switch (cmd) { 556 557 case IPC_RMID: 558 { 559 #ifdef MAC 560 struct msg *msghdr; 561 #endif 562 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M))) 563 goto done2; 564 565 #ifdef MAC 566 /* 567 * Check that the thread has MAC access permissions to 568 * individual msghdrs. Note: We need to do this in a 569 * separate loop because the actual loop alters the 570 * msq/msghdr info as it progresses, and there is no going 571 * back if half the way through we discover that the 572 * thread cannot free a certain msghdr. The msq will get 573 * into an inconsistent state. 574 */ 575 for (msghdr = msqkptr->u.__msg_first; msghdr != NULL; 576 msghdr = msghdr->msg_next) { 577 error = mac_sysvmsq_check_msgrmid(td->td_ucred, msghdr); 578 if (error != 0) 579 goto done2; 580 } 581 #endif 582 583 msq_remove(msqkptr); 584 } 585 586 break; 587 588 case IPC_SET: 589 AUDIT_ARG_SVIPC_PERM(&msqbuf->msg_perm); 590 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M))) 591 goto done2; 592 if (msqbuf->msg_qbytes > msqkptr->u.msg_qbytes) { 593 error = priv_check(td, PRIV_IPC_MSGSIZE); 594 if (error) 595 goto done2; 596 } 597 if (msqbuf->msg_qbytes > msginfo.msgmnb) { 598 DPRINTF(("can't increase msg_qbytes beyond %d" 599 "(truncating)\n", msginfo.msgmnb)); 600 msqbuf->msg_qbytes = msginfo.msgmnb; /* silently restrict qbytes to system limit */ 601 } 602 if (msqbuf->msg_qbytes == 0) { 603 DPRINTF(("can't reduce msg_qbytes to 0\n")); 604 error = EINVAL; /* non-standard errno! */ 605 goto done2; 606 } 607 msqkptr->u.msg_perm.uid = msqbuf->msg_perm.uid; /* change the owner */ 608 msqkptr->u.msg_perm.gid = msqbuf->msg_perm.gid; /* change the owner */ 609 msqkptr->u.msg_perm.mode = (msqkptr->u.msg_perm.mode & ~0777) | 610 (msqbuf->msg_perm.mode & 0777); 611 msqkptr->u.msg_qbytes = msqbuf->msg_qbytes; 612 msqkptr->u.msg_ctime = time_second; 613 break; 614 615 case IPC_STAT: 616 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) { 617 DPRINTF(("requester doesn't have read access\n")); 618 goto done2; 619 } 620 *msqbuf = msqkptr->u; 621 if (td->td_ucred->cr_prison != msqkptr->cred->cr_prison) 622 msqbuf->msg_perm.key = IPC_PRIVATE; 623 break; 624 625 default: 626 DPRINTF(("invalid command %d\n", cmd)); 627 error = EINVAL; 628 goto done2; 629 } 630 631 if (error == 0) 632 td->td_retval[0] = rval; 633 done2: 634 mtx_unlock(&msq_mtx); 635 return (error); 636 } 637 638 #ifndef _SYS_SYSPROTO_H_ 639 struct msgget_args { 640 key_t key; 641 int msgflg; 642 }; 643 #endif 644 645 int 646 sys_msgget(struct thread *td, struct msgget_args *uap) 647 { 648 int msqid, error = 0; 649 int key = uap->key; 650 int msgflg = uap->msgflg; 651 struct ucred *cred = td->td_ucred; 652 struct msqid_kernel *msqkptr = NULL; 653 654 DPRINTF(("msgget(0x%x, 0%o)\n", key, msgflg)); 655 656 if (msg_find_prison(cred) == NULL) 657 return (ENOSYS); 658 659 mtx_lock(&msq_mtx); 660 if (key != IPC_PRIVATE) { 661 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 662 msqkptr = &msqids[msqid]; 663 if (msqkptr->u.msg_qbytes != 0 && 664 msqkptr->cred != NULL && 665 msqkptr->cred->cr_prison == cred->cr_prison && 666 msqkptr->u.msg_perm.key == key) 667 break; 668 } 669 if (msqid < msginfo.msgmni) { 670 DPRINTF(("found public key\n")); 671 if ((msgflg & IPC_CREAT) && (msgflg & IPC_EXCL)) { 672 DPRINTF(("not exclusive\n")); 673 error = EEXIST; 674 goto done2; 675 } 676 AUDIT_ARG_SVIPC_ID(IXSEQ_TO_IPCID(msqid, 677 msqkptr->u.msg_perm)); 678 if ((error = ipcperm(td, &msqkptr->u.msg_perm, 679 msgflg & 0700))) { 680 DPRINTF(("requester doesn't have 0%o access\n", 681 msgflg & 0700)); 682 goto done2; 683 } 684 #ifdef MAC 685 error = mac_sysvmsq_check_msqget(cred, msqkptr); 686 if (error != 0) 687 goto done2; 688 #endif 689 goto found; 690 } 691 } 692 693 DPRINTF(("need to allocate the msqid_ds\n")); 694 if (key == IPC_PRIVATE || (msgflg & IPC_CREAT)) { 695 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 696 /* 697 * Look for an unallocated and unlocked msqid_ds. 698 * msqid_ds's can be locked by msgsnd or msgrcv while 699 * they are copying the message in/out. We can't 700 * re-use the entry until they release it. 701 */ 702 msqkptr = &msqids[msqid]; 703 if (msqkptr->u.msg_qbytes == 0 && 704 (msqkptr->u.msg_perm.mode & MSG_LOCKED) == 0) 705 break; 706 } 707 if (msqid == msginfo.msgmni) { 708 DPRINTF(("no more msqid_ds's available\n")); 709 error = ENOSPC; 710 goto done2; 711 } 712 #ifdef RACCT 713 if (racct_enable) { 714 PROC_LOCK(td->td_proc); 715 error = racct_add(td->td_proc, RACCT_NMSGQ, 1); 716 PROC_UNLOCK(td->td_proc); 717 if (error != 0) { 718 error = ENOSPC; 719 goto done2; 720 } 721 } 722 #endif 723 DPRINTF(("msqid %d is available\n", msqid)); 724 msqkptr->u.msg_perm.key = key; 725 msqkptr->u.msg_perm.cuid = cred->cr_uid; 726 msqkptr->u.msg_perm.uid = cred->cr_uid; 727 msqkptr->u.msg_perm.cgid = cred->cr_gid; 728 msqkptr->u.msg_perm.gid = cred->cr_gid; 729 msqkptr->u.msg_perm.mode = (msgflg & 0777); 730 msqkptr->cred = crhold(cred); 731 /* Make sure that the returned msqid is unique */ 732 msqkptr->u.msg_perm.seq = (msqkptr->u.msg_perm.seq + 1) & 0x7fff; 733 msqkptr->u.__msg_first = NULL; 734 msqkptr->u.__msg_last = NULL; 735 msqkptr->u.msg_cbytes = 0; 736 msqkptr->u.msg_qnum = 0; 737 msqkptr->u.msg_qbytes = msginfo.msgmnb; 738 msqkptr->u.msg_lspid = 0; 739 msqkptr->u.msg_lrpid = 0; 740 msqkptr->u.msg_stime = 0; 741 msqkptr->u.msg_rtime = 0; 742 msqkptr->u.msg_ctime = time_second; 743 #ifdef MAC 744 mac_sysvmsq_create(cred, msqkptr); 745 #endif 746 AUDIT_ARG_SVIPC_PERM(&msqkptr->u.msg_perm); 747 } else { 748 DPRINTF(("didn't find it and wasn't asked to create it\n")); 749 error = ENOENT; 750 goto done2; 751 } 752 753 found: 754 /* Construct the unique msqid */ 755 td->td_retval[0] = IXSEQ_TO_IPCID(msqid, msqkptr->u.msg_perm); 756 done2: 757 mtx_unlock(&msq_mtx); 758 return (error); 759 } 760 761 #ifndef _SYS_SYSPROTO_H_ 762 struct msgsnd_args { 763 int msqid; 764 const void *msgp; /* XXX msgp is actually mtext. */ 765 size_t msgsz; 766 int msgflg; 767 }; 768 #endif 769 int 770 kern_msgsnd(struct thread *td, int msqid, const void *msgp, 771 size_t msgsz, int msgflg, long mtype) 772 { 773 int msqix, segs_needed, error = 0; 774 struct msqid_kernel *msqkptr; 775 struct msg *msghdr; 776 struct prison *rpr; 777 short next; 778 #ifdef RACCT 779 size_t saved_msgsz = 0; 780 #endif 781 782 rpr = msg_find_prison(td->td_ucred); 783 if (rpr == NULL) 784 return (ENOSYS); 785 786 mtx_lock(&msq_mtx); 787 AUDIT_ARG_SVIPC_ID(msqid); 788 msqix = IPCID_TO_IX(msqid); 789 790 if (msqix < 0 || msqix >= msginfo.msgmni) { 791 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 792 msginfo.msgmni)); 793 error = EINVAL; 794 goto done2; 795 } 796 797 msqkptr = &msqids[msqix]; 798 AUDIT_ARG_SVIPC_PERM(&msqkptr->u.msg_perm); 799 if (msqkptr->u.msg_qbytes == 0) { 800 DPRINTF(("no such message queue id\n")); 801 error = EINVAL; 802 goto done2; 803 } 804 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 805 DPRINTF(("wrong sequence number\n")); 806 error = EINVAL; 807 goto done2; 808 } 809 810 if ((error = msq_prison_cansee(rpr, msqkptr))) { 811 DPRINTF(("requester can't see prison\n")); 812 goto done2; 813 } 814 815 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_W))) { 816 DPRINTF(("requester doesn't have write access\n")); 817 goto done2; 818 } 819 820 #ifdef MAC 821 error = mac_sysvmsq_check_msqsnd(td->td_ucred, msqkptr); 822 if (error != 0) 823 goto done2; 824 #endif 825 826 #ifdef RACCT 827 if (racct_enable) { 828 PROC_LOCK(td->td_proc); 829 if (racct_add(td->td_proc, RACCT_MSGQQUEUED, 1)) { 830 PROC_UNLOCK(td->td_proc); 831 error = EAGAIN; 832 goto done2; 833 } 834 saved_msgsz = msgsz; 835 if (racct_add(td->td_proc, RACCT_MSGQSIZE, msgsz)) { 836 racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1); 837 PROC_UNLOCK(td->td_proc); 838 error = EAGAIN; 839 goto done2; 840 } 841 PROC_UNLOCK(td->td_proc); 842 } 843 #endif 844 845 segs_needed = howmany(msgsz, msginfo.msgssz); 846 DPRINTF(("msgsz=%zu, msgssz=%d, segs_needed=%d\n", msgsz, 847 msginfo.msgssz, segs_needed)); 848 for (;;) { 849 int need_more_resources = 0; 850 851 /* 852 * check msgsz 853 * (inside this loop in case msg_qbytes changes while we sleep) 854 */ 855 856 if (msgsz > msqkptr->u.msg_qbytes) { 857 DPRINTF(("msgsz > msqkptr->u.msg_qbytes\n")); 858 error = EINVAL; 859 goto done3; 860 } 861 862 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) { 863 DPRINTF(("msqid is locked\n")); 864 need_more_resources = 1; 865 } 866 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) { 867 DPRINTF(("msgsz + msg_cbytes > msg_qbytes\n")); 868 need_more_resources = 1; 869 } 870 if (segs_needed > nfree_msgmaps) { 871 DPRINTF(("segs_needed > nfree_msgmaps\n")); 872 need_more_resources = 1; 873 } 874 if (free_msghdrs == NULL) { 875 DPRINTF(("no more msghdrs\n")); 876 need_more_resources = 1; 877 } 878 879 if (need_more_resources) { 880 int we_own_it; 881 882 if ((msgflg & IPC_NOWAIT) != 0) { 883 DPRINTF(("need more resources but caller " 884 "doesn't want to wait\n")); 885 error = EAGAIN; 886 goto done3; 887 } 888 889 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) { 890 DPRINTF(("we don't own the msqid_ds\n")); 891 we_own_it = 0; 892 } else { 893 /* Force later arrivals to wait for our 894 request */ 895 DPRINTF(("we own the msqid_ds\n")); 896 msqkptr->u.msg_perm.mode |= MSG_LOCKED; 897 we_own_it = 1; 898 } 899 DPRINTF(("msgsnd: goodnight\n")); 900 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH, 901 "msgsnd", hz); 902 DPRINTF(("msgsnd: good morning, error=%d\n", error)); 903 if (we_own_it) 904 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 905 if (error == EWOULDBLOCK) { 906 DPRINTF(("msgsnd: timed out\n")); 907 continue; 908 } 909 if (error != 0) { 910 DPRINTF(("msgsnd: interrupted system call\n")); 911 error = EINTR; 912 goto done3; 913 } 914 915 /* 916 * Make sure that the msq queue still exists 917 */ 918 919 if (msqkptr->u.msg_qbytes == 0) { 920 DPRINTF(("msqid deleted\n")); 921 error = EIDRM; 922 goto done3; 923 } 924 925 } else { 926 DPRINTF(("got all the resources that we need\n")); 927 break; 928 } 929 } 930 931 /* 932 * We have the resources that we need. 933 * Make sure! 934 */ 935 936 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) 937 panic("msg_perm.mode & MSG_LOCKED"); 938 if (segs_needed > nfree_msgmaps) 939 panic("segs_needed > nfree_msgmaps"); 940 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) 941 panic("msgsz + msg_cbytes > msg_qbytes"); 942 if (free_msghdrs == NULL) 943 panic("no more msghdrs"); 944 945 /* 946 * Re-lock the msqid_ds in case we page-fault when copying in the 947 * message 948 */ 949 950 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) 951 panic("msqid_ds is already locked"); 952 msqkptr->u.msg_perm.mode |= MSG_LOCKED; 953 954 /* 955 * Allocate a message header 956 */ 957 958 msghdr = free_msghdrs; 959 free_msghdrs = msghdr->msg_next; 960 msghdr->msg_spot = -1; 961 msghdr->msg_ts = msgsz; 962 msghdr->msg_type = mtype; 963 #ifdef MAC 964 /* 965 * XXXMAC: Should the mac_sysvmsq_check_msgmsq check follow here 966 * immediately? Or, should it be checked just before the msg is 967 * enqueued in the msgq (as it is done now)? 968 */ 969 mac_sysvmsg_create(td->td_ucred, msqkptr, msghdr); 970 #endif 971 972 /* 973 * Allocate space for the message 974 */ 975 976 while (segs_needed > 0) { 977 if (nfree_msgmaps <= 0) 978 panic("not enough msgmaps"); 979 if (free_msgmaps == -1) 980 panic("nil free_msgmaps"); 981 next = free_msgmaps; 982 if (next <= -1) 983 panic("next too low #1"); 984 if (next >= msginfo.msgseg) 985 panic("next out of range #1"); 986 DPRINTF(("allocating segment %d to message\n", next)); 987 free_msgmaps = msgmaps[next].next; 988 nfree_msgmaps--; 989 msgmaps[next].next = msghdr->msg_spot; 990 msghdr->msg_spot = next; 991 segs_needed--; 992 } 993 994 /* 995 * Validate the message type 996 */ 997 998 if (msghdr->msg_type < 1) { 999 msg_freehdr(msghdr); 1000 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 1001 wakeup(msqkptr); 1002 DPRINTF(("mtype (%ld) < 1\n", msghdr->msg_type)); 1003 error = EINVAL; 1004 goto done3; 1005 } 1006 1007 /* 1008 * Copy in the message body 1009 */ 1010 1011 next = msghdr->msg_spot; 1012 while (msgsz > 0) { 1013 size_t tlen; 1014 if (msgsz > msginfo.msgssz) 1015 tlen = msginfo.msgssz; 1016 else 1017 tlen = msgsz; 1018 if (next <= -1) 1019 panic("next too low #2"); 1020 if (next >= msginfo.msgseg) 1021 panic("next out of range #2"); 1022 mtx_unlock(&msq_mtx); 1023 if ((error = copyin(msgp, &msgpool[next * msginfo.msgssz], 1024 tlen)) != 0) { 1025 mtx_lock(&msq_mtx); 1026 DPRINTF(("error %d copying in message segment\n", 1027 error)); 1028 msg_freehdr(msghdr); 1029 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 1030 wakeup(msqkptr); 1031 goto done3; 1032 } 1033 mtx_lock(&msq_mtx); 1034 msgsz -= tlen; 1035 msgp = (const char *)msgp + tlen; 1036 next = msgmaps[next].next; 1037 } 1038 if (next != -1) 1039 panic("didn't use all the msg segments"); 1040 1041 /* 1042 * We've got the message. Unlock the msqid_ds. 1043 */ 1044 1045 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 1046 1047 /* 1048 * Make sure that the msqid_ds is still allocated. 1049 */ 1050 1051 if (msqkptr->u.msg_qbytes == 0) { 1052 msg_freehdr(msghdr); 1053 wakeup(msqkptr); 1054 error = EIDRM; 1055 goto done3; 1056 } 1057 1058 #ifdef MAC 1059 /* 1060 * Note: Since the task/thread allocates the msghdr and usually 1061 * primes it with its own MAC label, for a majority of policies, it 1062 * won't be necessary to check whether the msghdr has access 1063 * permissions to the msgq. The mac_sysvmsq_check_msqsnd check would 1064 * suffice in that case. However, this hook may be required where 1065 * individual policies derive a non-identical label for the msghdr 1066 * from the current thread label and may want to check the msghdr 1067 * enqueue permissions, along with read/write permissions to the 1068 * msgq. 1069 */ 1070 error = mac_sysvmsq_check_msgmsq(td->td_ucred, msghdr, msqkptr); 1071 if (error != 0) { 1072 msg_freehdr(msghdr); 1073 wakeup(msqkptr); 1074 goto done3; 1075 } 1076 #endif 1077 1078 /* 1079 * Put the message into the queue 1080 */ 1081 if (msqkptr->u.__msg_first == NULL) { 1082 msqkptr->u.__msg_first = msghdr; 1083 msqkptr->u.__msg_last = msghdr; 1084 } else { 1085 msqkptr->u.__msg_last->msg_next = msghdr; 1086 msqkptr->u.__msg_last = msghdr; 1087 } 1088 msqkptr->u.__msg_last->msg_next = NULL; 1089 1090 msqkptr->u.msg_cbytes += msghdr->msg_ts; 1091 msqkptr->u.msg_qnum++; 1092 msqkptr->u.msg_lspid = td->td_proc->p_pid; 1093 msqkptr->u.msg_stime = time_second; 1094 1095 wakeup(msqkptr); 1096 td->td_retval[0] = 0; 1097 done3: 1098 #ifdef RACCT 1099 if (racct_enable && error != 0) { 1100 PROC_LOCK(td->td_proc); 1101 racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1); 1102 racct_sub(td->td_proc, RACCT_MSGQSIZE, saved_msgsz); 1103 PROC_UNLOCK(td->td_proc); 1104 } 1105 #endif 1106 done2: 1107 mtx_unlock(&msq_mtx); 1108 return (error); 1109 } 1110 1111 int 1112 sys_msgsnd(struct thread *td, struct msgsnd_args *uap) 1113 { 1114 int error; 1115 long mtype; 1116 1117 DPRINTF(("call to msgsnd(%d, %p, %zu, %d)\n", uap->msqid, uap->msgp, 1118 uap->msgsz, uap->msgflg)); 1119 1120 if ((error = copyin(uap->msgp, &mtype, sizeof(mtype))) != 0) { 1121 DPRINTF(("error %d copying the message type\n", error)); 1122 return (error); 1123 } 1124 return (kern_msgsnd(td, uap->msqid, 1125 (const char *)uap->msgp + sizeof(mtype), 1126 uap->msgsz, uap->msgflg, mtype)); 1127 } 1128 1129 #ifndef _SYS_SYSPROTO_H_ 1130 struct msgrcv_args { 1131 int msqid; 1132 void *msgp; 1133 size_t msgsz; 1134 long msgtyp; 1135 int msgflg; 1136 }; 1137 #endif 1138 /* XXX msgp is actually mtext. */ 1139 int 1140 kern_msgrcv(struct thread *td, int msqid, void *msgp, size_t msgsz, long msgtyp, 1141 int msgflg, long *mtype) 1142 { 1143 size_t len; 1144 struct msqid_kernel *msqkptr; 1145 struct msg *msghdr; 1146 struct prison *rpr; 1147 int msqix, error = 0; 1148 short next; 1149 1150 rpr = msg_find_prison(td->td_ucred); 1151 if (rpr == NULL) 1152 return (ENOSYS); 1153 1154 AUDIT_ARG_SVIPC_ID(msqid); 1155 msqix = IPCID_TO_IX(msqid); 1156 1157 if (msqix < 0 || msqix >= msginfo.msgmni) { 1158 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 1159 msginfo.msgmni)); 1160 return (EINVAL); 1161 } 1162 1163 msqkptr = &msqids[msqix]; 1164 mtx_lock(&msq_mtx); 1165 AUDIT_ARG_SVIPC_PERM(&msqkptr->u.msg_perm); 1166 if (msqkptr->u.msg_qbytes == 0) { 1167 DPRINTF(("no such message queue id\n")); 1168 error = EINVAL; 1169 goto done2; 1170 } 1171 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 1172 DPRINTF(("wrong sequence number\n")); 1173 error = EINVAL; 1174 goto done2; 1175 } 1176 1177 if ((error = msq_prison_cansee(rpr, msqkptr))) { 1178 DPRINTF(("requester can't see prison\n")); 1179 goto done2; 1180 } 1181 1182 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) { 1183 DPRINTF(("requester doesn't have read access\n")); 1184 goto done2; 1185 } 1186 1187 #ifdef MAC 1188 error = mac_sysvmsq_check_msqrcv(td->td_ucred, msqkptr); 1189 if (error != 0) 1190 goto done2; 1191 #endif 1192 1193 msghdr = NULL; 1194 while (msghdr == NULL) { 1195 if (msgtyp == 0) { 1196 msghdr = msqkptr->u.__msg_first; 1197 if (msghdr != NULL) { 1198 if (msgsz < msghdr->msg_ts && 1199 (msgflg & MSG_NOERROR) == 0) { 1200 DPRINTF(("first message on the queue " 1201 "is too big (want %zu, got %d)\n", 1202 msgsz, msghdr->msg_ts)); 1203 error = E2BIG; 1204 goto done2; 1205 } 1206 #ifdef MAC 1207 error = mac_sysvmsq_check_msgrcv(td->td_ucred, 1208 msghdr); 1209 if (error != 0) 1210 goto done2; 1211 #endif 1212 if (msqkptr->u.__msg_first == 1213 msqkptr->u.__msg_last) { 1214 msqkptr->u.__msg_first = NULL; 1215 msqkptr->u.__msg_last = NULL; 1216 } else { 1217 msqkptr->u.__msg_first = msghdr->msg_next; 1218 if (msqkptr->u.__msg_first == NULL) 1219 panic("msg_first/last screwed up #1"); 1220 } 1221 } 1222 } else { 1223 struct msg *previous; 1224 struct msg **prev; 1225 1226 previous = NULL; 1227 prev = &(msqkptr->u.__msg_first); 1228 while ((msghdr = *prev) != NULL) { 1229 /* 1230 * Is this message's type an exact match or is 1231 * this message's type less than or equal to 1232 * the absolute value of a negative msgtyp? 1233 * Note that the second half of this test can 1234 * NEVER be true if msgtyp is positive since 1235 * msg_type is always positive! 1236 */ 1237 1238 if (msgtyp == msghdr->msg_type || 1239 msghdr->msg_type <= -msgtyp) { 1240 DPRINTF(("found message type %ld, " 1241 "requested %ld\n", 1242 msghdr->msg_type, msgtyp)); 1243 if (msgsz < msghdr->msg_ts && 1244 (msgflg & MSG_NOERROR) == 0) { 1245 DPRINTF(("requested message " 1246 "on the queue is too big " 1247 "(want %zu, got %hu)\n", 1248 msgsz, msghdr->msg_ts)); 1249 error = E2BIG; 1250 goto done2; 1251 } 1252 #ifdef MAC 1253 error = mac_sysvmsq_check_msgrcv( 1254 td->td_ucred, msghdr); 1255 if (error != 0) 1256 goto done2; 1257 #endif 1258 *prev = msghdr->msg_next; 1259 if (msghdr == msqkptr->u.__msg_last) { 1260 if (previous == NULL) { 1261 if (prev != 1262 &msqkptr->u.__msg_first) 1263 panic("__msg_first/last screwed up #2"); 1264 msqkptr->u.__msg_first = 1265 NULL; 1266 msqkptr->u.__msg_last = 1267 NULL; 1268 } else { 1269 if (prev == 1270 &msqkptr->u.__msg_first) 1271 panic("__msg_first/last screwed up #3"); 1272 msqkptr->u.__msg_last = 1273 previous; 1274 } 1275 } 1276 break; 1277 } 1278 previous = msghdr; 1279 prev = &(msghdr->msg_next); 1280 } 1281 } 1282 1283 /* 1284 * We've either extracted the msghdr for the appropriate 1285 * message or there isn't one. 1286 * If there is one then bail out of this loop. 1287 */ 1288 1289 if (msghdr != NULL) 1290 break; 1291 1292 /* 1293 * Hmph! No message found. Does the user want to wait? 1294 */ 1295 1296 if ((msgflg & IPC_NOWAIT) != 0) { 1297 DPRINTF(("no appropriate message found (msgtyp=%ld)\n", 1298 msgtyp)); 1299 /* The SVID says to return ENOMSG. */ 1300 error = ENOMSG; 1301 goto done2; 1302 } 1303 1304 /* 1305 * Wait for something to happen 1306 */ 1307 1308 DPRINTF(("msgrcv: goodnight\n")); 1309 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH, 1310 "msgrcv", 0); 1311 DPRINTF(("msgrcv: good morning (error=%d)\n", error)); 1312 1313 if (error != 0) { 1314 DPRINTF(("msgrcv: interrupted system call\n")); 1315 error = EINTR; 1316 goto done2; 1317 } 1318 1319 /* 1320 * Make sure that the msq queue still exists 1321 */ 1322 1323 if (msqkptr->u.msg_qbytes == 0 || 1324 msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 1325 DPRINTF(("msqid deleted\n")); 1326 error = EIDRM; 1327 goto done2; 1328 } 1329 } 1330 1331 /* 1332 * Return the message to the user. 1333 * 1334 * First, do the bookkeeping (before we risk being interrupted). 1335 */ 1336 1337 msqkptr->u.msg_cbytes -= msghdr->msg_ts; 1338 msqkptr->u.msg_qnum--; 1339 msqkptr->u.msg_lrpid = td->td_proc->p_pid; 1340 msqkptr->u.msg_rtime = time_second; 1341 1342 racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, 1); 1343 racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msghdr->msg_ts); 1344 1345 /* 1346 * Make msgsz the actual amount that we'll be returning. 1347 * Note that this effectively truncates the message if it is too long 1348 * (since msgsz is never increased). 1349 */ 1350 1351 DPRINTF(("found a message, msgsz=%zu, msg_ts=%hu\n", msgsz, 1352 msghdr->msg_ts)); 1353 if (msgsz > msghdr->msg_ts) 1354 msgsz = msghdr->msg_ts; 1355 *mtype = msghdr->msg_type; 1356 1357 /* 1358 * Return the segments to the user 1359 */ 1360 1361 next = msghdr->msg_spot; 1362 for (len = 0; len < msgsz; len += msginfo.msgssz) { 1363 size_t tlen; 1364 1365 if (msgsz - len > msginfo.msgssz) 1366 tlen = msginfo.msgssz; 1367 else 1368 tlen = msgsz - len; 1369 if (next <= -1) 1370 panic("next too low #3"); 1371 if (next >= msginfo.msgseg) 1372 panic("next out of range #3"); 1373 mtx_unlock(&msq_mtx); 1374 error = copyout(&msgpool[next * msginfo.msgssz], msgp, tlen); 1375 mtx_lock(&msq_mtx); 1376 if (error != 0) { 1377 DPRINTF(("error (%d) copying out message segment\n", 1378 error)); 1379 msg_freehdr(msghdr); 1380 wakeup(msqkptr); 1381 goto done2; 1382 } 1383 msgp = (char *)msgp + tlen; 1384 next = msgmaps[next].next; 1385 } 1386 1387 /* 1388 * Done, return the actual number of bytes copied out. 1389 */ 1390 1391 msg_freehdr(msghdr); 1392 wakeup(msqkptr); 1393 td->td_retval[0] = msgsz; 1394 done2: 1395 mtx_unlock(&msq_mtx); 1396 return (error); 1397 } 1398 1399 int 1400 sys_msgrcv(struct thread *td, struct msgrcv_args *uap) 1401 { 1402 int error; 1403 long mtype; 1404 1405 DPRINTF(("call to msgrcv(%d, %p, %zu, %ld, %d)\n", uap->msqid, 1406 uap->msgp, uap->msgsz, uap->msgtyp, uap->msgflg)); 1407 1408 if ((error = kern_msgrcv(td, uap->msqid, 1409 (char *)uap->msgp + sizeof(mtype), uap->msgsz, 1410 uap->msgtyp, uap->msgflg, &mtype)) != 0) 1411 return (error); 1412 if ((error = copyout(&mtype, uap->msgp, sizeof(mtype))) != 0) 1413 DPRINTF(("error %d copying the message type\n", error)); 1414 return (error); 1415 } 1416 1417 static int 1418 sysctl_msqids(SYSCTL_HANDLER_ARGS) 1419 { 1420 struct msqid_kernel tmsqk; 1421 #ifdef COMPAT_FREEBSD32 1422 struct msqid_kernel32 tmsqk32; 1423 #endif 1424 struct prison *pr, *rpr; 1425 void *outaddr; 1426 size_t outsize; 1427 int error, i; 1428 1429 pr = req->td->td_ucred->cr_prison; 1430 rpr = msg_find_prison(req->td->td_ucred); 1431 error = 0; 1432 for (i = 0; i < msginfo.msgmni; i++) { 1433 mtx_lock(&msq_mtx); 1434 if (msqids[i].u.msg_qbytes == 0 || rpr == NULL || 1435 msq_prison_cansee(rpr, &msqids[i]) != 0) 1436 bzero(&tmsqk, sizeof(tmsqk)); 1437 else { 1438 tmsqk = msqids[i]; 1439 if (tmsqk.cred->cr_prison != pr) 1440 tmsqk.u.msg_perm.key = IPC_PRIVATE; 1441 } 1442 mtx_unlock(&msq_mtx); 1443 #ifdef COMPAT_FREEBSD32 1444 if (SV_CURPROC_FLAG(SV_ILP32)) { 1445 bzero(&tmsqk32, sizeof(tmsqk32)); 1446 freebsd32_ipcperm_out(&tmsqk.u.msg_perm, 1447 &tmsqk32.u.msg_perm); 1448 /* Don't copy u.msg_first or u.msg_last */ 1449 CP(tmsqk, tmsqk32, u.msg_cbytes); 1450 CP(tmsqk, tmsqk32, u.msg_qnum); 1451 CP(tmsqk, tmsqk32, u.msg_qbytes); 1452 CP(tmsqk, tmsqk32, u.msg_lspid); 1453 CP(tmsqk, tmsqk32, u.msg_lrpid); 1454 CP(tmsqk, tmsqk32, u.msg_stime); 1455 CP(tmsqk, tmsqk32, u.msg_rtime); 1456 CP(tmsqk, tmsqk32, u.msg_ctime); 1457 /* Don't copy label or cred */ 1458 outaddr = &tmsqk32; 1459 outsize = sizeof(tmsqk32); 1460 } else 1461 #endif 1462 { 1463 /* Don't leak kernel pointers */ 1464 tmsqk.u.__msg_first = NULL; 1465 tmsqk.u.__msg_last = NULL; 1466 tmsqk.label = NULL; 1467 tmsqk.cred = NULL; 1468 /* 1469 * XXX: some padding also exists, but we take care to 1470 * allocate our pool of msqid_kernel structs with 1471 * zeroed memory so this should be OK. 1472 */ 1473 outaddr = &tmsqk; 1474 outsize = sizeof(tmsqk); 1475 } 1476 error = SYSCTL_OUT(req, outaddr, outsize); 1477 if (error != 0) 1478 break; 1479 } 1480 return (error); 1481 } 1482 1483 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmax, CTLFLAG_RD, &msginfo.msgmax, 0, 1484 "Maximum message size"); 1485 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmni, CTLFLAG_RDTUN, &msginfo.msgmni, 0, 1486 "Number of message queue identifiers"); 1487 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmnb, CTLFLAG_RDTUN, &msginfo.msgmnb, 0, 1488 "Maximum number of bytes in a queue"); 1489 SYSCTL_INT(_kern_ipc, OID_AUTO, msgtql, CTLFLAG_RDTUN, &msginfo.msgtql, 0, 1490 "Maximum number of messages in the system"); 1491 SYSCTL_INT(_kern_ipc, OID_AUTO, msgssz, CTLFLAG_RDTUN, &msginfo.msgssz, 0, 1492 "Size of a message segment"); 1493 SYSCTL_INT(_kern_ipc, OID_AUTO, msgseg, CTLFLAG_RDTUN, &msginfo.msgseg, 0, 1494 "Number of message segments"); 1495 SYSCTL_PROC(_kern_ipc, OID_AUTO, msqids, 1496 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, 1497 NULL, 0, sysctl_msqids, "", 1498 "Array of struct msqid_kernel for each potential message queue"); 1499 1500 static int 1501 msg_prison_check(void *obj, void *data) 1502 { 1503 struct prison *pr = obj; 1504 struct prison *prpr; 1505 struct vfsoptlist *opts = data; 1506 int error, jsys; 1507 1508 /* 1509 * sysvmsg is a jailsys integer. 1510 * It must be "disable" if the parent jail is disabled. 1511 */ 1512 error = vfs_copyopt(opts, "sysvmsg", &jsys, sizeof(jsys)); 1513 if (error != ENOENT) { 1514 if (error != 0) 1515 return (error); 1516 switch (jsys) { 1517 case JAIL_SYS_DISABLE: 1518 break; 1519 case JAIL_SYS_NEW: 1520 case JAIL_SYS_INHERIT: 1521 prison_lock(pr->pr_parent); 1522 prpr = osd_jail_get(pr->pr_parent, msg_prison_slot); 1523 prison_unlock(pr->pr_parent); 1524 if (prpr == NULL) 1525 return (EPERM); 1526 break; 1527 default: 1528 return (EINVAL); 1529 } 1530 } 1531 1532 return (0); 1533 } 1534 1535 static int 1536 msg_prison_set(void *obj, void *data) 1537 { 1538 struct prison *pr = obj; 1539 struct prison *tpr, *orpr, *nrpr, *trpr; 1540 struct vfsoptlist *opts = data; 1541 void *rsv; 1542 int jsys, descend; 1543 1544 /* 1545 * sysvmsg controls which jail is the root of the associated msgs (this 1546 * jail or same as the parent), or if the feature is available at all. 1547 */ 1548 if (vfs_copyopt(opts, "sysvmsg", &jsys, sizeof(jsys)) == ENOENT) 1549 jsys = vfs_flagopt(opts, "allow.sysvipc", NULL, 0) 1550 ? JAIL_SYS_INHERIT 1551 : vfs_flagopt(opts, "allow.nosysvipc", NULL, 0) 1552 ? JAIL_SYS_DISABLE 1553 : -1; 1554 if (jsys == JAIL_SYS_DISABLE) { 1555 prison_lock(pr); 1556 orpr = osd_jail_get(pr, msg_prison_slot); 1557 if (orpr != NULL) 1558 osd_jail_del(pr, msg_prison_slot); 1559 prison_unlock(pr); 1560 if (orpr != NULL) { 1561 if (orpr == pr) 1562 msg_prison_cleanup(pr); 1563 /* Disable all child jails as well. */ 1564 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1565 prison_lock(tpr); 1566 trpr = osd_jail_get(tpr, msg_prison_slot); 1567 if (trpr != NULL) { 1568 osd_jail_del(tpr, msg_prison_slot); 1569 prison_unlock(tpr); 1570 if (trpr == tpr) 1571 msg_prison_cleanup(tpr); 1572 } else { 1573 prison_unlock(tpr); 1574 descend = 0; 1575 } 1576 } 1577 } 1578 } else if (jsys != -1) { 1579 if (jsys == JAIL_SYS_NEW) 1580 nrpr = pr; 1581 else { 1582 prison_lock(pr->pr_parent); 1583 nrpr = osd_jail_get(pr->pr_parent, msg_prison_slot); 1584 prison_unlock(pr->pr_parent); 1585 } 1586 rsv = osd_reserve(msg_prison_slot); 1587 prison_lock(pr); 1588 orpr = osd_jail_get(pr, msg_prison_slot); 1589 if (orpr != nrpr) 1590 (void)osd_jail_set_reserved(pr, msg_prison_slot, rsv, 1591 nrpr); 1592 else 1593 osd_free_reserved(rsv); 1594 prison_unlock(pr); 1595 if (orpr != nrpr) { 1596 if (orpr == pr) 1597 msg_prison_cleanup(pr); 1598 if (orpr != NULL) { 1599 /* Change child jails matching the old root, */ 1600 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1601 prison_lock(tpr); 1602 trpr = osd_jail_get(tpr, 1603 msg_prison_slot); 1604 if (trpr == orpr) { 1605 (void)osd_jail_set(tpr, 1606 msg_prison_slot, nrpr); 1607 prison_unlock(tpr); 1608 if (trpr == tpr) 1609 msg_prison_cleanup(tpr); 1610 } else { 1611 prison_unlock(tpr); 1612 descend = 0; 1613 } 1614 } 1615 } 1616 } 1617 } 1618 1619 return (0); 1620 } 1621 1622 static int 1623 msg_prison_get(void *obj, void *data) 1624 { 1625 struct prison *pr = obj; 1626 struct prison *rpr; 1627 struct vfsoptlist *opts = data; 1628 int error, jsys; 1629 1630 /* Set sysvmsg based on the jail's root prison. */ 1631 prison_lock(pr); 1632 rpr = osd_jail_get(pr, msg_prison_slot); 1633 prison_unlock(pr); 1634 jsys = rpr == NULL ? JAIL_SYS_DISABLE 1635 : rpr == pr ? JAIL_SYS_NEW : JAIL_SYS_INHERIT; 1636 error = vfs_setopt(opts, "sysvmsg", &jsys, sizeof(jsys)); 1637 if (error == ENOENT) 1638 error = 0; 1639 return (error); 1640 } 1641 1642 static int 1643 msg_prison_remove(void *obj, void *data __unused) 1644 { 1645 struct prison *pr = obj; 1646 struct prison *rpr; 1647 1648 prison_lock(pr); 1649 rpr = osd_jail_get(pr, msg_prison_slot); 1650 prison_unlock(pr); 1651 if (rpr == pr) 1652 msg_prison_cleanup(pr); 1653 return (0); 1654 } 1655 1656 static void 1657 msg_prison_cleanup(struct prison *pr) 1658 { 1659 struct msqid_kernel *msqkptr; 1660 int i; 1661 1662 /* Remove any msqs that belong to this jail. */ 1663 mtx_lock(&msq_mtx); 1664 for (i = 0; i < msginfo.msgmni; i++) { 1665 msqkptr = &msqids[i]; 1666 if (msqkptr->u.msg_qbytes != 0 && 1667 msqkptr->cred != NULL && msqkptr->cred->cr_prison == pr) 1668 msq_remove(msqkptr); 1669 } 1670 mtx_unlock(&msq_mtx); 1671 } 1672 1673 SYSCTL_JAIL_PARAM_SYS_NODE(sysvmsg, CTLFLAG_RW, "SYSV message queues"); 1674 1675 #ifdef COMPAT_FREEBSD32 1676 int 1677 freebsd32_msgsys(struct thread *td, struct freebsd32_msgsys_args *uap) 1678 { 1679 1680 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1681 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1682 AUDIT_ARG_SVIPC_WHICH(uap->which); 1683 switch (uap->which) { 1684 case 0: 1685 return (freebsd7_freebsd32_msgctl(td, 1686 (struct freebsd7_freebsd32_msgctl_args *)&uap->a2)); 1687 case 2: 1688 return (freebsd32_msgsnd(td, 1689 (struct freebsd32_msgsnd_args *)&uap->a2)); 1690 case 3: 1691 return (freebsd32_msgrcv(td, 1692 (struct freebsd32_msgrcv_args *)&uap->a2)); 1693 default: 1694 return (sys_msgsys(td, (struct msgsys_args *)uap)); 1695 } 1696 #else 1697 return (nosys(td, NULL)); 1698 #endif 1699 } 1700 1701 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1702 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1703 int 1704 freebsd7_freebsd32_msgctl(struct thread *td, 1705 struct freebsd7_freebsd32_msgctl_args *uap) 1706 { 1707 struct msqid_ds msqbuf; 1708 struct msqid_ds32_old msqbuf32; 1709 int error; 1710 1711 if (uap->cmd == IPC_SET) { 1712 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32)); 1713 if (error) 1714 return (error); 1715 freebsd32_ipcperm_old_in(&msqbuf32.msg_perm, &msqbuf.msg_perm); 1716 PTRIN_CP(msqbuf32, msqbuf, __msg_first); 1717 PTRIN_CP(msqbuf32, msqbuf, __msg_last); 1718 CP(msqbuf32, msqbuf, msg_cbytes); 1719 CP(msqbuf32, msqbuf, msg_qnum); 1720 CP(msqbuf32, msqbuf, msg_qbytes); 1721 CP(msqbuf32, msqbuf, msg_lspid); 1722 CP(msqbuf32, msqbuf, msg_lrpid); 1723 CP(msqbuf32, msqbuf, msg_stime); 1724 CP(msqbuf32, msqbuf, msg_rtime); 1725 CP(msqbuf32, msqbuf, msg_ctime); 1726 } 1727 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1728 if (error) 1729 return (error); 1730 if (uap->cmd == IPC_STAT) { 1731 bzero(&msqbuf32, sizeof(msqbuf32)); 1732 freebsd32_ipcperm_old_out(&msqbuf.msg_perm, &msqbuf32.msg_perm); 1733 PTROUT_CP(msqbuf, msqbuf32, __msg_first); 1734 PTROUT_CP(msqbuf, msqbuf32, __msg_last); 1735 CP(msqbuf, msqbuf32, msg_cbytes); 1736 CP(msqbuf, msqbuf32, msg_qnum); 1737 CP(msqbuf, msqbuf32, msg_qbytes); 1738 CP(msqbuf, msqbuf32, msg_lspid); 1739 CP(msqbuf, msqbuf32, msg_lrpid); 1740 CP(msqbuf, msqbuf32, msg_stime); 1741 CP(msqbuf, msqbuf32, msg_rtime); 1742 CP(msqbuf, msqbuf32, msg_ctime); 1743 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32)); 1744 } 1745 return (error); 1746 } 1747 #endif 1748 1749 int 1750 freebsd32_msgctl(struct thread *td, struct freebsd32_msgctl_args *uap) 1751 { 1752 struct msqid_ds msqbuf; 1753 struct msqid_ds32 msqbuf32; 1754 int error; 1755 1756 if (uap->cmd == IPC_SET) { 1757 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32)); 1758 if (error) 1759 return (error); 1760 freebsd32_ipcperm_in(&msqbuf32.msg_perm, &msqbuf.msg_perm); 1761 PTRIN_CP(msqbuf32, msqbuf, __msg_first); 1762 PTRIN_CP(msqbuf32, msqbuf, __msg_last); 1763 CP(msqbuf32, msqbuf, msg_cbytes); 1764 CP(msqbuf32, msqbuf, msg_qnum); 1765 CP(msqbuf32, msqbuf, msg_qbytes); 1766 CP(msqbuf32, msqbuf, msg_lspid); 1767 CP(msqbuf32, msqbuf, msg_lrpid); 1768 CP(msqbuf32, msqbuf, msg_stime); 1769 CP(msqbuf32, msqbuf, msg_rtime); 1770 CP(msqbuf32, msqbuf, msg_ctime); 1771 } 1772 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1773 if (error) 1774 return (error); 1775 if (uap->cmd == IPC_STAT) { 1776 freebsd32_ipcperm_out(&msqbuf.msg_perm, &msqbuf32.msg_perm); 1777 PTROUT_CP(msqbuf, msqbuf32, __msg_first); 1778 PTROUT_CP(msqbuf, msqbuf32, __msg_last); 1779 CP(msqbuf, msqbuf32, msg_cbytes); 1780 CP(msqbuf, msqbuf32, msg_qnum); 1781 CP(msqbuf, msqbuf32, msg_qbytes); 1782 CP(msqbuf, msqbuf32, msg_lspid); 1783 CP(msqbuf, msqbuf32, msg_lrpid); 1784 CP(msqbuf, msqbuf32, msg_stime); 1785 CP(msqbuf, msqbuf32, msg_rtime); 1786 CP(msqbuf, msqbuf32, msg_ctime); 1787 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32)); 1788 } 1789 return (error); 1790 } 1791 1792 int 1793 freebsd32_msgsnd(struct thread *td, struct freebsd32_msgsnd_args *uap) 1794 { 1795 const void *msgp; 1796 long mtype; 1797 int32_t mtype32; 1798 int error; 1799 1800 msgp = PTRIN(uap->msgp); 1801 if ((error = copyin(msgp, &mtype32, sizeof(mtype32))) != 0) 1802 return (error); 1803 mtype = mtype32; 1804 return (kern_msgsnd(td, uap->msqid, 1805 (const char *)msgp + sizeof(mtype32), 1806 uap->msgsz, uap->msgflg, mtype)); 1807 } 1808 1809 int 1810 freebsd32_msgrcv(struct thread *td, struct freebsd32_msgrcv_args *uap) 1811 { 1812 void *msgp; 1813 long mtype; 1814 int32_t mtype32; 1815 int error; 1816 1817 msgp = PTRIN(uap->msgp); 1818 if ((error = kern_msgrcv(td, uap->msqid, 1819 (char *)msgp + sizeof(mtype32), uap->msgsz, 1820 uap->msgtyp, uap->msgflg, &mtype)) != 0) 1821 return (error); 1822 mtype32 = (int32_t)mtype; 1823 return (copyout(&mtype32, msgp, sizeof(mtype32))); 1824 } 1825 #endif 1826 1827 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1828 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1829 1830 /* XXX casting to (sy_call_t *) is bogus, as usual. */ 1831 static sy_call_t *msgcalls[] = { 1832 (sy_call_t *)freebsd7_msgctl, (sy_call_t *)sys_msgget, 1833 (sy_call_t *)sys_msgsnd, (sy_call_t *)sys_msgrcv 1834 }; 1835 1836 /* 1837 * Entry point for all MSG calls. 1838 * 1839 * XXX actually varargs. 1840 * struct msgsys_args { 1841 * int which; 1842 * int a2; 1843 * int a3; 1844 * int a4; 1845 * int a5; 1846 * int a6; 1847 * } *uap; 1848 */ 1849 int 1850 sys_msgsys(struct thread *td, struct msgsys_args *uap) 1851 { 1852 int error; 1853 1854 AUDIT_ARG_SVIPC_WHICH(uap->which); 1855 if (uap->which < 0 || uap->which >= nitems(msgcalls)) 1856 return (EINVAL); 1857 error = (*msgcalls[uap->which])(td, &uap->a2); 1858 return (error); 1859 } 1860 1861 #ifndef CP 1862 #define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0) 1863 #endif 1864 1865 #ifndef _SYS_SYSPROTO_H_ 1866 struct freebsd7_msgctl_args { 1867 int msqid; 1868 int cmd; 1869 struct msqid_ds_old *buf; 1870 }; 1871 #endif 1872 int 1873 freebsd7_msgctl(struct thread *td, struct freebsd7_msgctl_args *uap) 1874 { 1875 struct msqid_ds_old msqold; 1876 struct msqid_ds msqbuf; 1877 int error; 1878 1879 DPRINTF(("call to freebsd7_msgctl(%d, %d, %p)\n", uap->msqid, uap->cmd, 1880 uap->buf)); 1881 if (uap->cmd == IPC_SET) { 1882 error = copyin(uap->buf, &msqold, sizeof(msqold)); 1883 if (error) 1884 return (error); 1885 ipcperm_old2new(&msqold.msg_perm, &msqbuf.msg_perm); 1886 CP(msqold, msqbuf, __msg_first); 1887 CP(msqold, msqbuf, __msg_last); 1888 CP(msqold, msqbuf, msg_cbytes); 1889 CP(msqold, msqbuf, msg_qnum); 1890 CP(msqold, msqbuf, msg_qbytes); 1891 CP(msqold, msqbuf, msg_lspid); 1892 CP(msqold, msqbuf, msg_lrpid); 1893 CP(msqold, msqbuf, msg_stime); 1894 CP(msqold, msqbuf, msg_rtime); 1895 CP(msqold, msqbuf, msg_ctime); 1896 } 1897 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1898 if (error) 1899 return (error); 1900 if (uap->cmd == IPC_STAT) { 1901 bzero(&msqold, sizeof(msqold)); 1902 ipcperm_new2old(&msqbuf.msg_perm, &msqold.msg_perm); 1903 CP(msqbuf, msqold, __msg_first); 1904 CP(msqbuf, msqold, __msg_last); 1905 CP(msqbuf, msqold, msg_cbytes); 1906 CP(msqbuf, msqold, msg_qnum); 1907 CP(msqbuf, msqold, msg_qbytes); 1908 CP(msqbuf, msqold, msg_lspid); 1909 CP(msqbuf, msqold, msg_lrpid); 1910 CP(msqbuf, msqold, msg_stime); 1911 CP(msqbuf, msqold, msg_rtime); 1912 CP(msqbuf, msqold, msg_ctime); 1913 error = copyout(&msqold, uap->buf, sizeof(struct msqid_ds_old)); 1914 } 1915 return (error); 1916 } 1917 1918 #undef CP 1919 1920 #endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 || 1921 COMPAT_FREEBSD7 */ 1922