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 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 #include "opt_sysvipc.h" 60 61 #include <sys/param.h> 62 #include <sys/systm.h> 63 #include <sys/sysproto.h> 64 #include <sys/kernel.h> 65 #include <sys/priv.h> 66 #include <sys/proc.h> 67 #include <sys/lock.h> 68 #include <sys/mutex.h> 69 #include <sys/module.h> 70 #include <sys/mount.h> 71 #include <sys/msg.h> 72 #include <sys/racct.h> 73 #include <sys/sx.h> 74 #include <sys/syscall.h> 75 #include <sys/syscallsubr.h> 76 #include <sys/sysent.h> 77 #include <sys/sysctl.h> 78 #include <sys/malloc.h> 79 #include <sys/jail.h> 80 81 #include <security/audit/audit.h> 82 #include <security/mac/mac_framework.h> 83 84 FEATURE(sysv_msg, "System V message queues support"); 85 86 static MALLOC_DEFINE(M_MSG, "msg", "SVID compatible message queues"); 87 88 static int msginit(void); 89 static int msgunload(void); 90 static int sysvmsg_modload(struct module *, int, void *); 91 static void msq_remove(struct msqid_kernel *); 92 static struct prison *msg_find_prison(struct ucred *); 93 static int msq_prison_cansee(struct prison *, struct msqid_kernel *); 94 static int msg_prison_check(void *, void *); 95 static int msg_prison_set(void *, void *); 96 static int msg_prison_get(void *, void *); 97 static int msg_prison_remove(void *, void *); 98 static void msg_prison_cleanup(struct prison *); 99 100 #ifdef MSG_DEBUG 101 #define DPRINTF(a) printf a 102 #else 103 #define DPRINTF(a) (void)0 104 #endif 105 106 static void msg_freehdr(struct msg *msghdr); 107 108 #ifndef MSGSSZ 109 #define MSGSSZ 8 /* Each segment must be 2^N long */ 110 #endif 111 #ifndef MSGSEG 112 #define MSGSEG 2048 /* must be less than 32767 */ 113 #endif 114 #define MSGMAX (MSGSSZ*MSGSEG) 115 #ifndef MSGMNB 116 #define MSGMNB 2048 /* max # of bytes in a queue */ 117 #endif 118 #ifndef MSGMNI 119 #define MSGMNI 40 120 #endif 121 #ifndef MSGTQL 122 #define MSGTQL 40 123 #endif 124 125 /* 126 * Based on the configuration parameters described in an SVR2 (yes, two) 127 * config(1m) man page. 128 * 129 * Each message is broken up and stored in segments that are msgssz bytes 130 * long. For efficiency reasons, this should be a power of two. Also, 131 * it doesn't make sense if it is less than 8 or greater than about 256. 132 * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of 133 * two between 8 and 1024 inclusive (and panic's if it isn't). 134 */ 135 struct msginfo msginfo = { 136 MSGMAX, /* max chars in a message */ 137 MSGMNI, /* # of message queue identifiers */ 138 MSGMNB, /* max chars in a queue */ 139 MSGTQL, /* max messages in system */ 140 MSGSSZ, /* size of a message segment */ 141 /* (must be small power of 2 greater than 4) */ 142 MSGSEG /* number of message segments */ 143 }; 144 145 /* 146 * macros to convert between msqid_ds's and msqid's. 147 * (specific to this implementation) 148 */ 149 #define MSQID(ix,ds) ((ix) & 0xffff | (((ds).msg_perm.seq << 16) & 0xffff0000)) 150 #define MSQID_IX(id) ((id) & 0xffff) 151 #define MSQID_SEQ(id) (((id) >> 16) & 0xffff) 152 153 /* 154 * The rest of this file is specific to this particular implementation. 155 */ 156 157 struct msgmap { 158 short next; /* next segment in buffer */ 159 /* -1 -> available */ 160 /* 0..(MSGSEG-1) -> index of next segment */ 161 }; 162 163 #define MSG_LOCKED 01000 /* Is this msqid_ds locked? */ 164 165 static int nfree_msgmaps; /* # of free map entries */ 166 static short free_msgmaps; /* head of linked list of free map entries */ 167 static struct msg *free_msghdrs;/* list of free msg headers */ 168 static char *msgpool; /* MSGMAX byte long msg buffer pool */ 169 static struct msgmap *msgmaps; /* MSGSEG msgmap structures */ 170 static struct msg *msghdrs; /* MSGTQL msg headers */ 171 static struct msqid_kernel *msqids; /* MSGMNI msqid_kernel struct's */ 172 static struct mtx msq_mtx; /* global mutex for message queues. */ 173 static unsigned msg_prison_slot;/* prison OSD slot */ 174 175 static struct syscall_helper_data msg_syscalls[] = { 176 SYSCALL_INIT_HELPER(msgctl), 177 SYSCALL_INIT_HELPER(msgget), 178 SYSCALL_INIT_HELPER(msgsnd), 179 SYSCALL_INIT_HELPER(msgrcv), 180 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 181 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 182 SYSCALL_INIT_HELPER(msgsys), 183 SYSCALL_INIT_HELPER_COMPAT(freebsd7_msgctl), 184 #endif 185 SYSCALL_INIT_LAST 186 }; 187 188 #ifdef COMPAT_FREEBSD32 189 #include <compat/freebsd32/freebsd32.h> 190 #include <compat/freebsd32/freebsd32_ipc.h> 191 #include <compat/freebsd32/freebsd32_proto.h> 192 #include <compat/freebsd32/freebsd32_signal.h> 193 #include <compat/freebsd32/freebsd32_syscall.h> 194 #include <compat/freebsd32/freebsd32_util.h> 195 196 static struct syscall_helper_data msg32_syscalls[] = { 197 SYSCALL32_INIT_HELPER(freebsd32_msgctl), 198 SYSCALL32_INIT_HELPER(freebsd32_msgsnd), 199 SYSCALL32_INIT_HELPER(freebsd32_msgrcv), 200 SYSCALL32_INIT_HELPER_COMPAT(msgget), 201 SYSCALL32_INIT_HELPER(freebsd32_msgsys), 202 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 203 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 204 SYSCALL32_INIT_HELPER(freebsd7_freebsd32_msgctl), 205 #endif 206 SYSCALL_INIT_LAST 207 }; 208 #endif 209 210 static int 211 msginit(void) 212 { 213 struct prison *pr; 214 void **rsv; 215 int i, error; 216 osd_method_t methods[PR_MAXMETHOD] = { 217 [PR_METHOD_CHECK] = msg_prison_check, 218 [PR_METHOD_SET] = msg_prison_set, 219 [PR_METHOD_GET] = msg_prison_get, 220 [PR_METHOD_REMOVE] = msg_prison_remove, 221 }; 222 223 msginfo.msgmax = msginfo.msgseg * msginfo.msgssz; 224 msgpool = malloc(msginfo.msgmax, M_MSG, M_WAITOK); 225 msgmaps = malloc(sizeof(struct msgmap) * msginfo.msgseg, M_MSG, M_WAITOK); 226 msghdrs = malloc(sizeof(struct msg) * msginfo.msgtql, M_MSG, M_WAITOK); 227 msqids = malloc(sizeof(struct msqid_kernel) * msginfo.msgmni, M_MSG, 228 M_WAITOK | M_ZERO); 229 230 /* 231 * msginfo.msgssz should be a power of two for efficiency reasons. 232 * It is also pretty silly if msginfo.msgssz is less than 8 233 * or greater than about 256 so ... 234 */ 235 236 i = 8; 237 while (i < 1024 && i != msginfo.msgssz) 238 i <<= 1; 239 if (i != msginfo.msgssz) { 240 DPRINTF(("msginfo.msgssz=%d (0x%x)\n", msginfo.msgssz, 241 msginfo.msgssz)); 242 panic("msginfo.msgssz not a small power of 2"); 243 } 244 245 if (msginfo.msgseg > 32767) { 246 DPRINTF(("msginfo.msgseg=%d\n", msginfo.msgseg)); 247 panic("msginfo.msgseg > 32767"); 248 } 249 250 for (i = 0; i < msginfo.msgseg; i++) { 251 if (i > 0) 252 msgmaps[i-1].next = i; 253 msgmaps[i].next = -1; /* implies entry is available */ 254 } 255 free_msgmaps = 0; 256 nfree_msgmaps = msginfo.msgseg; 257 258 for (i = 0; i < msginfo.msgtql; i++) { 259 msghdrs[i].msg_type = 0; 260 if (i > 0) 261 msghdrs[i-1].msg_next = &msghdrs[i]; 262 msghdrs[i].msg_next = NULL; 263 #ifdef MAC 264 mac_sysvmsg_init(&msghdrs[i]); 265 #endif 266 } 267 free_msghdrs = &msghdrs[0]; 268 269 for (i = 0; i < msginfo.msgmni; i++) { 270 msqids[i].u.msg_qbytes = 0; /* implies entry is available */ 271 msqids[i].u.msg_perm.seq = 0; /* reset to a known value */ 272 msqids[i].u.msg_perm.mode = 0; 273 #ifdef MAC 274 mac_sysvmsq_init(&msqids[i]); 275 #endif 276 } 277 mtx_init(&msq_mtx, "msq", NULL, MTX_DEF); 278 279 /* Set current prisons according to their allow.sysvipc. */ 280 msg_prison_slot = osd_jail_register(NULL, methods); 281 rsv = osd_reserve(msg_prison_slot); 282 prison_lock(&prison0); 283 (void)osd_jail_set_reserved(&prison0, msg_prison_slot, rsv, &prison0); 284 prison_unlock(&prison0); 285 rsv = NULL; 286 sx_slock(&allprison_lock); 287 TAILQ_FOREACH(pr, &allprison, pr_list) { 288 if (rsv == NULL) 289 rsv = osd_reserve(msg_prison_slot); 290 prison_lock(pr); 291 if (pr->pr_allow & PR_ALLOW_SYSVIPC) { 292 (void)osd_jail_set_reserved(pr, msg_prison_slot, rsv, 293 &prison0); 294 rsv = NULL; 295 } 296 prison_unlock(pr); 297 } 298 if (rsv != NULL) 299 osd_free_reserved(rsv); 300 sx_sunlock(&allprison_lock); 301 302 error = syscall_helper_register(msg_syscalls, SY_THR_STATIC_KLD); 303 if (error != 0) 304 return (error); 305 #ifdef COMPAT_FREEBSD32 306 error = syscall32_helper_register(msg32_syscalls, SY_THR_STATIC_KLD); 307 if (error != 0) 308 return (error); 309 #endif 310 return (0); 311 } 312 313 static int 314 msgunload(void) 315 { 316 struct msqid_kernel *msqkptr; 317 int msqid; 318 #ifdef MAC 319 int i; 320 #endif 321 322 syscall_helper_unregister(msg_syscalls); 323 #ifdef COMPAT_FREEBSD32 324 syscall32_helper_unregister(msg32_syscalls); 325 #endif 326 327 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 328 msqkptr = &msqids[msqid]; 329 if (msqkptr->u.msg_qbytes != 0 || 330 (msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) 331 break; 332 } 333 if (msqid != msginfo.msgmni) 334 return (EBUSY); 335 336 if (msg_prison_slot != 0) 337 osd_jail_deregister(msg_prison_slot); 338 #ifdef MAC 339 for (i = 0; i < msginfo.msgtql; i++) 340 mac_sysvmsg_destroy(&msghdrs[i]); 341 for (msqid = 0; msqid < msginfo.msgmni; msqid++) 342 mac_sysvmsq_destroy(&msqids[msqid]); 343 #endif 344 free(msgpool, M_MSG); 345 free(msgmaps, M_MSG); 346 free(msghdrs, M_MSG); 347 free(msqids, M_MSG); 348 mtx_destroy(&msq_mtx); 349 return (0); 350 } 351 352 static int 353 sysvmsg_modload(struct module *module, int cmd, void *arg) 354 { 355 int error = 0; 356 357 switch (cmd) { 358 case MOD_LOAD: 359 error = msginit(); 360 if (error != 0) 361 msgunload(); 362 break; 363 case MOD_UNLOAD: 364 error = msgunload(); 365 break; 366 case MOD_SHUTDOWN: 367 break; 368 default: 369 error = EINVAL; 370 break; 371 } 372 return (error); 373 } 374 375 static moduledata_t sysvmsg_mod = { 376 "sysvmsg", 377 &sysvmsg_modload, 378 NULL 379 }; 380 381 DECLARE_MODULE(sysvmsg, sysvmsg_mod, SI_SUB_SYSV_MSG, SI_ORDER_FIRST); 382 MODULE_VERSION(sysvmsg, 1); 383 384 static void 385 msg_freehdr(struct msg *msghdr) 386 { 387 while (msghdr->msg_ts > 0) { 388 short next; 389 if (msghdr->msg_spot < 0 || msghdr->msg_spot >= msginfo.msgseg) 390 panic("msghdr->msg_spot out of range"); 391 next = msgmaps[msghdr->msg_spot].next; 392 msgmaps[msghdr->msg_spot].next = free_msgmaps; 393 free_msgmaps = msghdr->msg_spot; 394 nfree_msgmaps++; 395 msghdr->msg_spot = next; 396 if (msghdr->msg_ts >= msginfo.msgssz) 397 msghdr->msg_ts -= msginfo.msgssz; 398 else 399 msghdr->msg_ts = 0; 400 } 401 if (msghdr->msg_spot != -1) 402 panic("msghdr->msg_spot != -1"); 403 msghdr->msg_next = free_msghdrs; 404 free_msghdrs = msghdr; 405 #ifdef MAC 406 mac_sysvmsg_cleanup(msghdr); 407 #endif 408 } 409 410 static void 411 msq_remove(struct msqid_kernel *msqkptr) 412 { 413 struct msg *msghdr; 414 415 racct_sub_cred(msqkptr->cred, RACCT_NMSGQ, 1); 416 racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, msqkptr->u.msg_qnum); 417 racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msqkptr->u.msg_cbytes); 418 crfree(msqkptr->cred); 419 msqkptr->cred = NULL; 420 421 /* Free the message headers */ 422 msghdr = msqkptr->u.__msg_first; 423 while (msghdr != NULL) { 424 struct msg *msghdr_tmp; 425 426 /* Free the segments of each message */ 427 msqkptr->u.msg_cbytes -= msghdr->msg_ts; 428 msqkptr->u.msg_qnum--; 429 msghdr_tmp = msghdr; 430 msghdr = msghdr->msg_next; 431 msg_freehdr(msghdr_tmp); 432 } 433 434 if (msqkptr->u.msg_cbytes != 0) 435 panic("msg_cbytes is screwed up"); 436 if (msqkptr->u.msg_qnum != 0) 437 panic("msg_qnum is screwed up"); 438 439 msqkptr->u.msg_qbytes = 0; /* Mark it as free */ 440 441 #ifdef MAC 442 mac_sysvmsq_cleanup(msqkptr); 443 #endif 444 445 wakeup(msqkptr); 446 } 447 448 static struct prison * 449 msg_find_prison(struct ucred *cred) 450 { 451 struct prison *pr, *rpr; 452 453 pr = cred->cr_prison; 454 prison_lock(pr); 455 rpr = osd_jail_get(pr, msg_prison_slot); 456 prison_unlock(pr); 457 return rpr; 458 } 459 460 static int 461 msq_prison_cansee(struct prison *rpr, struct msqid_kernel *msqkptr) 462 { 463 464 if (msqkptr->cred == NULL || 465 !(rpr == msqkptr->cred->cr_prison || 466 prison_ischild(rpr, msqkptr->cred->cr_prison))) 467 return (EINVAL); 468 return (0); 469 } 470 471 #ifndef _SYS_SYSPROTO_H_ 472 struct msgctl_args { 473 int msqid; 474 int cmd; 475 struct msqid_ds *buf; 476 }; 477 #endif 478 int 479 sys_msgctl(struct thread *td, struct msgctl_args *uap) 480 { 481 int msqid = uap->msqid; 482 int cmd = uap->cmd; 483 struct msqid_ds msqbuf; 484 int error; 485 486 DPRINTF(("call to msgctl(%d, %d, %p)\n", msqid, cmd, uap->buf)); 487 if (cmd == IPC_SET && 488 (error = copyin(uap->buf, &msqbuf, sizeof(msqbuf))) != 0) 489 return (error); 490 error = kern_msgctl(td, msqid, cmd, &msqbuf); 491 if (cmd == IPC_STAT && error == 0) 492 error = copyout(&msqbuf, uap->buf, sizeof(struct msqid_ds)); 493 return (error); 494 } 495 496 int 497 kern_msgctl(struct thread *td, int msqid, int cmd, struct msqid_ds *msqbuf) 498 { 499 int rval, error, msqix; 500 struct msqid_kernel *msqkptr; 501 struct prison *rpr; 502 503 rpr = msg_find_prison(td->td_ucred); 504 if (rpr == NULL) 505 return (ENOSYS); 506 507 AUDIT_ARG_SVIPC_CMD(cmd); 508 AUDIT_ARG_SVIPC_ID(msqid); 509 msqix = IPCID_TO_IX(msqid); 510 511 if (msqix < 0 || msqix >= msginfo.msgmni) { 512 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 513 msginfo.msgmni)); 514 return (EINVAL); 515 } 516 517 msqkptr = &msqids[msqix]; 518 519 mtx_lock(&msq_mtx); 520 if (msqkptr->u.msg_qbytes == 0) { 521 DPRINTF(("no such msqid\n")); 522 error = EINVAL; 523 goto done2; 524 } 525 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 526 DPRINTF(("wrong sequence number\n")); 527 error = EINVAL; 528 goto done2; 529 } 530 531 error = msq_prison_cansee(rpr, msqkptr); 532 if (error != 0) { 533 DPRINTF(("requester can't see prison\n")); 534 goto done2; 535 } 536 537 #ifdef MAC 538 error = mac_sysvmsq_check_msqctl(td->td_ucred, msqkptr, cmd); 539 if (error != 0) 540 goto done2; 541 #endif 542 543 error = 0; 544 rval = 0; 545 546 switch (cmd) { 547 case IPC_RMID: 548 { 549 #ifdef MAC 550 struct msg *msghdr; 551 #endif 552 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M))) 553 goto done2; 554 555 #ifdef MAC 556 /* 557 * Check that the thread has MAC access permissions to 558 * individual msghdrs. Note: We need to do this in a 559 * separate loop because the actual loop alters the 560 * msq/msghdr info as it progresses, and there is no going 561 * back if half the way through we discover that the 562 * thread cannot free a certain msghdr. The msq will get 563 * into an inconsistent state. 564 */ 565 for (msghdr = msqkptr->u.__msg_first; msghdr != NULL; 566 msghdr = msghdr->msg_next) { 567 error = mac_sysvmsq_check_msgrmid(td->td_ucred, msghdr); 568 if (error != 0) 569 goto done2; 570 } 571 #endif 572 573 msq_remove(msqkptr); 574 } 575 576 break; 577 578 case IPC_SET: 579 AUDIT_ARG_SVIPC_PERM(&msqbuf->msg_perm); 580 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M))) 581 goto done2; 582 if (msqbuf->msg_qbytes > msqkptr->u.msg_qbytes) { 583 error = priv_check(td, PRIV_IPC_MSGSIZE); 584 if (error) 585 goto done2; 586 } 587 if (msqbuf->msg_qbytes > msginfo.msgmnb) { 588 DPRINTF(("can't increase msg_qbytes beyond %d" 589 "(truncating)\n", msginfo.msgmnb)); 590 msqbuf->msg_qbytes = msginfo.msgmnb; /* silently restrict qbytes to system limit */ 591 } 592 if (msqbuf->msg_qbytes == 0) { 593 DPRINTF(("can't reduce msg_qbytes to 0\n")); 594 error = EINVAL; /* non-standard errno! */ 595 goto done2; 596 } 597 msqkptr->u.msg_perm.uid = msqbuf->msg_perm.uid; /* change the owner */ 598 msqkptr->u.msg_perm.gid = msqbuf->msg_perm.gid; /* change the owner */ 599 msqkptr->u.msg_perm.mode = (msqkptr->u.msg_perm.mode & ~0777) | 600 (msqbuf->msg_perm.mode & 0777); 601 msqkptr->u.msg_qbytes = msqbuf->msg_qbytes; 602 msqkptr->u.msg_ctime = time_second; 603 break; 604 605 case IPC_STAT: 606 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) { 607 DPRINTF(("requester doesn't have read access\n")); 608 goto done2; 609 } 610 *msqbuf = msqkptr->u; 611 if (td->td_ucred->cr_prison != msqkptr->cred->cr_prison) 612 msqbuf->msg_perm.key = IPC_PRIVATE; 613 614 /* 615 * Try to hide the fact that the structure layout is shared by 616 * both the kernel and userland. These pointers are not useful 617 * to userspace. 618 */ 619 msqbuf->__msg_first = msqbuf->__msg_last = NULL; 620 break; 621 622 default: 623 DPRINTF(("invalid command %d\n", cmd)); 624 error = EINVAL; 625 goto done2; 626 } 627 628 if (error == 0) 629 td->td_retval[0] = rval; 630 done2: 631 mtx_unlock(&msq_mtx); 632 return (error); 633 } 634 635 #ifndef _SYS_SYSPROTO_H_ 636 struct msgget_args { 637 key_t key; 638 int msgflg; 639 }; 640 #endif 641 642 int 643 sys_msgget(struct thread *td, struct msgget_args *uap) 644 { 645 int msqid, error = 0; 646 int key = uap->key; 647 int msgflg = uap->msgflg; 648 struct ucred *cred = td->td_ucred; 649 struct msqid_kernel *msqkptr = NULL; 650 651 DPRINTF(("msgget(0x%x, 0%o)\n", key, msgflg)); 652 653 if (msg_find_prison(cred) == NULL) 654 return (ENOSYS); 655 656 mtx_lock(&msq_mtx); 657 if (key != IPC_PRIVATE) { 658 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 659 msqkptr = &msqids[msqid]; 660 if (msqkptr->u.msg_qbytes != 0 && 661 msqkptr->cred != NULL && 662 msqkptr->cred->cr_prison == cred->cr_prison && 663 msqkptr->u.msg_perm.key == key) 664 break; 665 } 666 if (msqid < msginfo.msgmni) { 667 DPRINTF(("found public key\n")); 668 if ((msgflg & IPC_CREAT) && (msgflg & IPC_EXCL)) { 669 DPRINTF(("not exclusive\n")); 670 error = EEXIST; 671 goto done2; 672 } 673 AUDIT_ARG_SVIPC_ID(IXSEQ_TO_IPCID(msqid, 674 msqkptr->u.msg_perm)); 675 if ((error = ipcperm(td, &msqkptr->u.msg_perm, 676 msgflg & 0700))) { 677 DPRINTF(("requester doesn't have 0%o access\n", 678 msgflg & 0700)); 679 goto done2; 680 } 681 #ifdef MAC 682 error = mac_sysvmsq_check_msqget(cred, msqkptr); 683 if (error != 0) 684 goto done2; 685 #endif 686 goto found; 687 } 688 } 689 690 DPRINTF(("need to allocate the msqid_ds\n")); 691 if (key == IPC_PRIVATE || (msgflg & IPC_CREAT)) { 692 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 693 /* 694 * Look for an unallocated and unlocked msqid_ds. 695 * msqid_ds's can be locked by msgsnd or msgrcv while 696 * they are copying the message in/out. We can't 697 * re-use the entry until they release it. 698 */ 699 msqkptr = &msqids[msqid]; 700 if (msqkptr->u.msg_qbytes == 0 && 701 (msqkptr->u.msg_perm.mode & MSG_LOCKED) == 0) 702 break; 703 } 704 if (msqid == msginfo.msgmni) { 705 DPRINTF(("no more msqid_ds's available\n")); 706 error = ENOSPC; 707 goto done2; 708 } 709 #ifdef RACCT 710 if (racct_enable) { 711 PROC_LOCK(td->td_proc); 712 error = racct_add(td->td_proc, RACCT_NMSGQ, 1); 713 PROC_UNLOCK(td->td_proc); 714 if (error != 0) { 715 error = ENOSPC; 716 goto done2; 717 } 718 } 719 #endif 720 DPRINTF(("msqid %d is available\n", msqid)); 721 msqkptr->u.msg_perm.key = key; 722 msqkptr->u.msg_perm.cuid = cred->cr_uid; 723 msqkptr->u.msg_perm.uid = cred->cr_uid; 724 msqkptr->u.msg_perm.cgid = cred->cr_gid; 725 msqkptr->u.msg_perm.gid = cred->cr_gid; 726 msqkptr->u.msg_perm.mode = (msgflg & 0777); 727 msqkptr->cred = crhold(cred); 728 /* Make sure that the returned msqid is unique */ 729 msqkptr->u.msg_perm.seq = (msqkptr->u.msg_perm.seq + 1) & 0x7fff; 730 msqkptr->u.__msg_first = NULL; 731 msqkptr->u.__msg_last = NULL; 732 msqkptr->u.msg_cbytes = 0; 733 msqkptr->u.msg_qnum = 0; 734 msqkptr->u.msg_qbytes = msginfo.msgmnb; 735 msqkptr->u.msg_lspid = 0; 736 msqkptr->u.msg_lrpid = 0; 737 msqkptr->u.msg_stime = 0; 738 msqkptr->u.msg_rtime = 0; 739 msqkptr->u.msg_ctime = time_second; 740 #ifdef MAC 741 mac_sysvmsq_create(cred, msqkptr); 742 #endif 743 AUDIT_ARG_SVIPC_PERM(&msqkptr->u.msg_perm); 744 } else { 745 DPRINTF(("didn't find it and wasn't asked to create it\n")); 746 error = ENOENT; 747 goto done2; 748 } 749 750 found: 751 /* Construct the unique msqid */ 752 td->td_retval[0] = IXSEQ_TO_IPCID(msqid, msqkptr->u.msg_perm); 753 done2: 754 mtx_unlock(&msq_mtx); 755 return (error); 756 } 757 758 #ifndef _SYS_SYSPROTO_H_ 759 struct msgsnd_args { 760 int msqid; 761 const void *msgp; /* XXX msgp is actually mtext. */ 762 size_t msgsz; 763 int msgflg; 764 }; 765 #endif 766 int 767 kern_msgsnd(struct thread *td, int msqid, const void *msgp, 768 size_t msgsz, int msgflg, long mtype) 769 { 770 int msqix, segs_needed, error = 0; 771 struct msqid_kernel *msqkptr; 772 struct msg *msghdr; 773 struct prison *rpr; 774 short next; 775 #ifdef RACCT 776 size_t saved_msgsz = 0; 777 #endif 778 779 rpr = msg_find_prison(td->td_ucred); 780 if (rpr == NULL) 781 return (ENOSYS); 782 783 mtx_lock(&msq_mtx); 784 AUDIT_ARG_SVIPC_ID(msqid); 785 msqix = IPCID_TO_IX(msqid); 786 787 if (msqix < 0 || msqix >= msginfo.msgmni) { 788 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 789 msginfo.msgmni)); 790 error = EINVAL; 791 goto done2; 792 } 793 794 msqkptr = &msqids[msqix]; 795 AUDIT_ARG_SVIPC_PERM(&msqkptr->u.msg_perm); 796 if (msqkptr->u.msg_qbytes == 0) { 797 DPRINTF(("no such message queue id\n")); 798 error = EINVAL; 799 goto done2; 800 } 801 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 802 DPRINTF(("wrong sequence number\n")); 803 error = EINVAL; 804 goto done2; 805 } 806 807 if ((error = msq_prison_cansee(rpr, msqkptr))) { 808 DPRINTF(("requester can't see prison\n")); 809 goto done2; 810 } 811 812 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_W))) { 813 DPRINTF(("requester doesn't have write access\n")); 814 goto done2; 815 } 816 817 #ifdef MAC 818 error = mac_sysvmsq_check_msqsnd(td->td_ucred, msqkptr); 819 if (error != 0) 820 goto done2; 821 #endif 822 823 #ifdef RACCT 824 if (racct_enable) { 825 PROC_LOCK(td->td_proc); 826 if (racct_add(td->td_proc, RACCT_MSGQQUEUED, 1)) { 827 PROC_UNLOCK(td->td_proc); 828 error = EAGAIN; 829 goto done2; 830 } 831 saved_msgsz = msgsz; 832 if (racct_add(td->td_proc, RACCT_MSGQSIZE, msgsz)) { 833 racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1); 834 PROC_UNLOCK(td->td_proc); 835 error = EAGAIN; 836 goto done2; 837 } 838 PROC_UNLOCK(td->td_proc); 839 } 840 #endif 841 842 segs_needed = howmany(msgsz, msginfo.msgssz); 843 DPRINTF(("msgsz=%zu, msgssz=%d, segs_needed=%d\n", msgsz, 844 msginfo.msgssz, segs_needed)); 845 for (;;) { 846 int need_more_resources = 0; 847 848 /* 849 * check msgsz 850 * (inside this loop in case msg_qbytes changes while we sleep) 851 */ 852 853 if (msgsz > msqkptr->u.msg_qbytes) { 854 DPRINTF(("msgsz > msqkptr->u.msg_qbytes\n")); 855 error = EINVAL; 856 goto done3; 857 } 858 859 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) { 860 DPRINTF(("msqid is locked\n")); 861 need_more_resources = 1; 862 } 863 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) { 864 DPRINTF(("msgsz + msg_cbytes > msg_qbytes\n")); 865 need_more_resources = 1; 866 } 867 if (segs_needed > nfree_msgmaps) { 868 DPRINTF(("segs_needed > nfree_msgmaps\n")); 869 need_more_resources = 1; 870 } 871 if (free_msghdrs == NULL) { 872 DPRINTF(("no more msghdrs\n")); 873 need_more_resources = 1; 874 } 875 876 if (need_more_resources) { 877 int we_own_it; 878 879 if ((msgflg & IPC_NOWAIT) != 0) { 880 DPRINTF(("need more resources but caller " 881 "doesn't want to wait\n")); 882 error = EAGAIN; 883 goto done3; 884 } 885 886 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) { 887 DPRINTF(("we don't own the msqid_ds\n")); 888 we_own_it = 0; 889 } else { 890 /* Force later arrivals to wait for our 891 request */ 892 DPRINTF(("we own the msqid_ds\n")); 893 msqkptr->u.msg_perm.mode |= MSG_LOCKED; 894 we_own_it = 1; 895 } 896 DPRINTF(("msgsnd: goodnight\n")); 897 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH, 898 "msgsnd", hz); 899 DPRINTF(("msgsnd: good morning, error=%d\n", error)); 900 if (we_own_it) 901 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 902 if (error == EWOULDBLOCK) { 903 DPRINTF(("msgsnd: timed out\n")); 904 continue; 905 } 906 if (error != 0) { 907 DPRINTF(("msgsnd: interrupted system call\n")); 908 error = EINTR; 909 goto done3; 910 } 911 912 /* 913 * Make sure that the msq queue still exists 914 */ 915 916 if (msqkptr->u.msg_qbytes == 0) { 917 DPRINTF(("msqid deleted\n")); 918 error = EIDRM; 919 goto done3; 920 } 921 922 } else { 923 DPRINTF(("got all the resources that we need\n")); 924 break; 925 } 926 } 927 928 /* 929 * We have the resources that we need. 930 * Make sure! 931 */ 932 933 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) 934 panic("msg_perm.mode & MSG_LOCKED"); 935 if (segs_needed > nfree_msgmaps) 936 panic("segs_needed > nfree_msgmaps"); 937 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) 938 panic("msgsz + msg_cbytes > msg_qbytes"); 939 if (free_msghdrs == NULL) 940 panic("no more msghdrs"); 941 942 /* 943 * Re-lock the msqid_ds in case we page-fault when copying in the 944 * message 945 */ 946 947 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) 948 panic("msqid_ds is already locked"); 949 msqkptr->u.msg_perm.mode |= MSG_LOCKED; 950 951 /* 952 * Allocate a message header 953 */ 954 955 msghdr = free_msghdrs; 956 free_msghdrs = msghdr->msg_next; 957 msghdr->msg_spot = -1; 958 msghdr->msg_ts = msgsz; 959 msghdr->msg_type = mtype; 960 #ifdef MAC 961 /* 962 * XXXMAC: Should the mac_sysvmsq_check_msgmsq check follow here 963 * immediately? Or, should it be checked just before the msg is 964 * enqueued in the msgq (as it is done now)? 965 */ 966 mac_sysvmsg_create(td->td_ucred, msqkptr, msghdr); 967 #endif 968 969 /* 970 * Allocate space for the message 971 */ 972 973 while (segs_needed > 0) { 974 if (nfree_msgmaps <= 0) 975 panic("not enough msgmaps"); 976 if (free_msgmaps == -1) 977 panic("nil free_msgmaps"); 978 next = free_msgmaps; 979 if (next <= -1) 980 panic("next too low #1"); 981 if (next >= msginfo.msgseg) 982 panic("next out of range #1"); 983 DPRINTF(("allocating segment %d to message\n", next)); 984 free_msgmaps = msgmaps[next].next; 985 nfree_msgmaps--; 986 msgmaps[next].next = msghdr->msg_spot; 987 msghdr->msg_spot = next; 988 segs_needed--; 989 } 990 991 /* 992 * Validate the message type 993 */ 994 995 if (msghdr->msg_type < 1) { 996 msg_freehdr(msghdr); 997 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 998 wakeup(msqkptr); 999 DPRINTF(("mtype (%ld) < 1\n", msghdr->msg_type)); 1000 error = EINVAL; 1001 goto done3; 1002 } 1003 1004 /* 1005 * Copy in the message body 1006 */ 1007 1008 next = msghdr->msg_spot; 1009 while (msgsz > 0) { 1010 size_t tlen; 1011 if (msgsz > msginfo.msgssz) 1012 tlen = msginfo.msgssz; 1013 else 1014 tlen = msgsz; 1015 if (next <= -1) 1016 panic("next too low #2"); 1017 if (next >= msginfo.msgseg) 1018 panic("next out of range #2"); 1019 mtx_unlock(&msq_mtx); 1020 if ((error = copyin(msgp, &msgpool[next * msginfo.msgssz], 1021 tlen)) != 0) { 1022 mtx_lock(&msq_mtx); 1023 DPRINTF(("error %d copying in message segment\n", 1024 error)); 1025 msg_freehdr(msghdr); 1026 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 1027 wakeup(msqkptr); 1028 goto done3; 1029 } 1030 mtx_lock(&msq_mtx); 1031 msgsz -= tlen; 1032 msgp = (const char *)msgp + tlen; 1033 next = msgmaps[next].next; 1034 } 1035 if (next != -1) 1036 panic("didn't use all the msg segments"); 1037 1038 /* 1039 * We've got the message. Unlock the msqid_ds. 1040 */ 1041 1042 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 1043 1044 /* 1045 * Make sure that the msqid_ds is still allocated. 1046 */ 1047 1048 if (msqkptr->u.msg_qbytes == 0) { 1049 msg_freehdr(msghdr); 1050 wakeup(msqkptr); 1051 error = EIDRM; 1052 goto done3; 1053 } 1054 1055 #ifdef MAC 1056 /* 1057 * Note: Since the task/thread allocates the msghdr and usually 1058 * primes it with its own MAC label, for a majority of policies, it 1059 * won't be necessary to check whether the msghdr has access 1060 * permissions to the msgq. The mac_sysvmsq_check_msqsnd check would 1061 * suffice in that case. However, this hook may be required where 1062 * individual policies derive a non-identical label for the msghdr 1063 * from the current thread label and may want to check the msghdr 1064 * enqueue permissions, along with read/write permissions to the 1065 * msgq. 1066 */ 1067 error = mac_sysvmsq_check_msgmsq(td->td_ucred, msghdr, msqkptr); 1068 if (error != 0) { 1069 msg_freehdr(msghdr); 1070 wakeup(msqkptr); 1071 goto done3; 1072 } 1073 #endif 1074 1075 /* 1076 * Put the message into the queue 1077 */ 1078 if (msqkptr->u.__msg_first == NULL) { 1079 msqkptr->u.__msg_first = msghdr; 1080 msqkptr->u.__msg_last = msghdr; 1081 } else { 1082 msqkptr->u.__msg_last->msg_next = msghdr; 1083 msqkptr->u.__msg_last = msghdr; 1084 } 1085 msqkptr->u.__msg_last->msg_next = NULL; 1086 1087 msqkptr->u.msg_cbytes += msghdr->msg_ts; 1088 msqkptr->u.msg_qnum++; 1089 msqkptr->u.msg_lspid = td->td_proc->p_pid; 1090 msqkptr->u.msg_stime = time_second; 1091 1092 wakeup(msqkptr); 1093 td->td_retval[0] = 0; 1094 done3: 1095 #ifdef RACCT 1096 if (racct_enable && error != 0) { 1097 PROC_LOCK(td->td_proc); 1098 racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1); 1099 racct_sub(td->td_proc, RACCT_MSGQSIZE, saved_msgsz); 1100 PROC_UNLOCK(td->td_proc); 1101 } 1102 #endif 1103 done2: 1104 mtx_unlock(&msq_mtx); 1105 return (error); 1106 } 1107 1108 int 1109 sys_msgsnd(struct thread *td, struct msgsnd_args *uap) 1110 { 1111 int error; 1112 long mtype; 1113 1114 DPRINTF(("call to msgsnd(%d, %p, %zu, %d)\n", uap->msqid, uap->msgp, 1115 uap->msgsz, uap->msgflg)); 1116 1117 if ((error = copyin(uap->msgp, &mtype, sizeof(mtype))) != 0) { 1118 DPRINTF(("error %d copying the message type\n", error)); 1119 return (error); 1120 } 1121 return (kern_msgsnd(td, uap->msqid, 1122 (const char *)uap->msgp + sizeof(mtype), 1123 uap->msgsz, uap->msgflg, mtype)); 1124 } 1125 1126 #ifndef _SYS_SYSPROTO_H_ 1127 struct msgrcv_args { 1128 int msqid; 1129 void *msgp; 1130 size_t msgsz; 1131 long msgtyp; 1132 int msgflg; 1133 }; 1134 #endif 1135 /* XXX msgp is actually mtext. */ 1136 int 1137 kern_msgrcv(struct thread *td, int msqid, void *msgp, size_t msgsz, long msgtyp, 1138 int msgflg, long *mtype) 1139 { 1140 size_t len; 1141 struct msqid_kernel *msqkptr; 1142 struct msg *msghdr; 1143 struct prison *rpr; 1144 int msqix, error = 0; 1145 short next; 1146 1147 rpr = msg_find_prison(td->td_ucred); 1148 if (rpr == NULL) 1149 return (ENOSYS); 1150 1151 AUDIT_ARG_SVIPC_ID(msqid); 1152 msqix = IPCID_TO_IX(msqid); 1153 1154 if (msqix < 0 || msqix >= msginfo.msgmni) { 1155 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 1156 msginfo.msgmni)); 1157 return (EINVAL); 1158 } 1159 1160 msqkptr = &msqids[msqix]; 1161 mtx_lock(&msq_mtx); 1162 AUDIT_ARG_SVIPC_PERM(&msqkptr->u.msg_perm); 1163 if (msqkptr->u.msg_qbytes == 0) { 1164 DPRINTF(("no such message queue id\n")); 1165 error = EINVAL; 1166 goto done2; 1167 } 1168 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 1169 DPRINTF(("wrong sequence number\n")); 1170 error = EINVAL; 1171 goto done2; 1172 } 1173 1174 if ((error = msq_prison_cansee(rpr, msqkptr))) { 1175 DPRINTF(("requester can't see prison\n")); 1176 goto done2; 1177 } 1178 1179 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) { 1180 DPRINTF(("requester doesn't have read access\n")); 1181 goto done2; 1182 } 1183 1184 #ifdef MAC 1185 error = mac_sysvmsq_check_msqrcv(td->td_ucred, msqkptr); 1186 if (error != 0) 1187 goto done2; 1188 #endif 1189 1190 msghdr = NULL; 1191 while (msghdr == NULL) { 1192 if (msgtyp == 0) { 1193 msghdr = msqkptr->u.__msg_first; 1194 if (msghdr != NULL) { 1195 if (msgsz < msghdr->msg_ts && 1196 (msgflg & MSG_NOERROR) == 0) { 1197 DPRINTF(("first message on the queue " 1198 "is too big (want %zu, got %d)\n", 1199 msgsz, msghdr->msg_ts)); 1200 error = E2BIG; 1201 goto done2; 1202 } 1203 #ifdef MAC 1204 error = mac_sysvmsq_check_msgrcv(td->td_ucred, 1205 msghdr); 1206 if (error != 0) 1207 goto done2; 1208 #endif 1209 if (msqkptr->u.__msg_first == 1210 msqkptr->u.__msg_last) { 1211 msqkptr->u.__msg_first = NULL; 1212 msqkptr->u.__msg_last = NULL; 1213 } else { 1214 msqkptr->u.__msg_first = msghdr->msg_next; 1215 if (msqkptr->u.__msg_first == NULL) 1216 panic("msg_first/last screwed up #1"); 1217 } 1218 } 1219 } else { 1220 struct msg *previous; 1221 struct msg **prev; 1222 1223 previous = NULL; 1224 prev = &(msqkptr->u.__msg_first); 1225 while ((msghdr = *prev) != NULL) { 1226 /* 1227 * Is this message's type an exact match or is 1228 * this message's type less than or equal to 1229 * the absolute value of a negative msgtyp? 1230 * Note that the second half of this test can 1231 * NEVER be true if msgtyp is positive since 1232 * msg_type is always positive! 1233 */ 1234 1235 if (msgtyp == msghdr->msg_type || 1236 msghdr->msg_type <= -msgtyp) { 1237 DPRINTF(("found message type %ld, " 1238 "requested %ld\n", 1239 msghdr->msg_type, msgtyp)); 1240 if (msgsz < msghdr->msg_ts && 1241 (msgflg & MSG_NOERROR) == 0) { 1242 DPRINTF(("requested message " 1243 "on the queue is too big " 1244 "(want %zu, got %hu)\n", 1245 msgsz, msghdr->msg_ts)); 1246 error = E2BIG; 1247 goto done2; 1248 } 1249 #ifdef MAC 1250 error = mac_sysvmsq_check_msgrcv( 1251 td->td_ucred, msghdr); 1252 if (error != 0) 1253 goto done2; 1254 #endif 1255 *prev = msghdr->msg_next; 1256 if (msghdr == msqkptr->u.__msg_last) { 1257 if (previous == NULL) { 1258 if (prev != 1259 &msqkptr->u.__msg_first) 1260 panic("__msg_first/last screwed up #2"); 1261 msqkptr->u.__msg_first = 1262 NULL; 1263 msqkptr->u.__msg_last = 1264 NULL; 1265 } else { 1266 if (prev == 1267 &msqkptr->u.__msg_first) 1268 panic("__msg_first/last screwed up #3"); 1269 msqkptr->u.__msg_last = 1270 previous; 1271 } 1272 } 1273 break; 1274 } 1275 previous = msghdr; 1276 prev = &(msghdr->msg_next); 1277 } 1278 } 1279 1280 /* 1281 * We've either extracted the msghdr for the appropriate 1282 * message or there isn't one. 1283 * If there is one then bail out of this loop. 1284 */ 1285 1286 if (msghdr != NULL) 1287 break; 1288 1289 /* 1290 * Hmph! No message found. Does the user want to wait? 1291 */ 1292 1293 if ((msgflg & IPC_NOWAIT) != 0) { 1294 DPRINTF(("no appropriate message found (msgtyp=%ld)\n", 1295 msgtyp)); 1296 /* The SVID says to return ENOMSG. */ 1297 error = ENOMSG; 1298 goto done2; 1299 } 1300 1301 /* 1302 * Wait for something to happen 1303 */ 1304 1305 DPRINTF(("msgrcv: goodnight\n")); 1306 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH, 1307 "msgrcv", 0); 1308 DPRINTF(("msgrcv: good morning (error=%d)\n", error)); 1309 1310 if (error != 0) { 1311 DPRINTF(("msgrcv: interrupted system call\n")); 1312 error = EINTR; 1313 goto done2; 1314 } 1315 1316 /* 1317 * Make sure that the msq queue still exists 1318 */ 1319 1320 if (msqkptr->u.msg_qbytes == 0 || 1321 msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 1322 DPRINTF(("msqid deleted\n")); 1323 error = EIDRM; 1324 goto done2; 1325 } 1326 } 1327 1328 /* 1329 * Return the message to the user. 1330 * 1331 * First, do the bookkeeping (before we risk being interrupted). 1332 */ 1333 1334 msqkptr->u.msg_cbytes -= msghdr->msg_ts; 1335 msqkptr->u.msg_qnum--; 1336 msqkptr->u.msg_lrpid = td->td_proc->p_pid; 1337 msqkptr->u.msg_rtime = time_second; 1338 1339 racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, 1); 1340 racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msghdr->msg_ts); 1341 1342 /* 1343 * Make msgsz the actual amount that we'll be returning. 1344 * Note that this effectively truncates the message if it is too long 1345 * (since msgsz is never increased). 1346 */ 1347 1348 DPRINTF(("found a message, msgsz=%zu, msg_ts=%hu\n", msgsz, 1349 msghdr->msg_ts)); 1350 if (msgsz > msghdr->msg_ts) 1351 msgsz = msghdr->msg_ts; 1352 *mtype = msghdr->msg_type; 1353 1354 /* 1355 * Return the segments to the user 1356 */ 1357 1358 next = msghdr->msg_spot; 1359 for (len = 0; len < msgsz; len += msginfo.msgssz) { 1360 size_t tlen; 1361 1362 if (msgsz - len > msginfo.msgssz) 1363 tlen = msginfo.msgssz; 1364 else 1365 tlen = msgsz - len; 1366 if (next <= -1) 1367 panic("next too low #3"); 1368 if (next >= msginfo.msgseg) 1369 panic("next out of range #3"); 1370 mtx_unlock(&msq_mtx); 1371 error = copyout(&msgpool[next * msginfo.msgssz], msgp, tlen); 1372 mtx_lock(&msq_mtx); 1373 if (error != 0) { 1374 DPRINTF(("error (%d) copying out message segment\n", 1375 error)); 1376 msg_freehdr(msghdr); 1377 wakeup(msqkptr); 1378 goto done2; 1379 } 1380 msgp = (char *)msgp + tlen; 1381 next = msgmaps[next].next; 1382 } 1383 1384 /* 1385 * Done, return the actual number of bytes copied out. 1386 */ 1387 1388 msg_freehdr(msghdr); 1389 wakeup(msqkptr); 1390 td->td_retval[0] = msgsz; 1391 done2: 1392 mtx_unlock(&msq_mtx); 1393 return (error); 1394 } 1395 1396 int 1397 sys_msgrcv(struct thread *td, struct msgrcv_args *uap) 1398 { 1399 int error; 1400 long mtype; 1401 1402 DPRINTF(("call to msgrcv(%d, %p, %zu, %ld, %d)\n", uap->msqid, 1403 uap->msgp, uap->msgsz, uap->msgtyp, uap->msgflg)); 1404 1405 if ((error = kern_msgrcv(td, uap->msqid, 1406 (char *)uap->msgp + sizeof(mtype), uap->msgsz, 1407 uap->msgtyp, uap->msgflg, &mtype)) != 0) 1408 return (error); 1409 if ((error = copyout(&mtype, uap->msgp, sizeof(mtype))) != 0) 1410 DPRINTF(("error %d copying the message type\n", error)); 1411 return (error); 1412 } 1413 1414 static int 1415 sysctl_msqids(SYSCTL_HANDLER_ARGS) 1416 { 1417 struct msqid_kernel tmsqk; 1418 #ifdef COMPAT_FREEBSD32 1419 struct msqid_kernel32 tmsqk32; 1420 #endif 1421 struct prison *pr, *rpr; 1422 void *outaddr; 1423 size_t outsize; 1424 int error, i; 1425 1426 pr = req->td->td_ucred->cr_prison; 1427 rpr = msg_find_prison(req->td->td_ucred); 1428 error = 0; 1429 for (i = 0; i < msginfo.msgmni; i++) { 1430 mtx_lock(&msq_mtx); 1431 if (msqids[i].u.msg_qbytes == 0 || rpr == NULL || 1432 msq_prison_cansee(rpr, &msqids[i]) != 0) 1433 bzero(&tmsqk, sizeof(tmsqk)); 1434 else { 1435 tmsqk = msqids[i]; 1436 if (tmsqk.cred->cr_prison != pr) 1437 tmsqk.u.msg_perm.key = IPC_PRIVATE; 1438 } 1439 mtx_unlock(&msq_mtx); 1440 #ifdef COMPAT_FREEBSD32 1441 if (SV_CURPROC_FLAG(SV_ILP32)) { 1442 bzero(&tmsqk32, sizeof(tmsqk32)); 1443 freebsd32_ipcperm_out(&tmsqk.u.msg_perm, 1444 &tmsqk32.u.msg_perm); 1445 /* Don't copy u.msg_first or u.msg_last */ 1446 CP(tmsqk, tmsqk32, u.msg_cbytes); 1447 CP(tmsqk, tmsqk32, u.msg_qnum); 1448 CP(tmsqk, tmsqk32, u.msg_qbytes); 1449 CP(tmsqk, tmsqk32, u.msg_lspid); 1450 CP(tmsqk, tmsqk32, u.msg_lrpid); 1451 CP(tmsqk, tmsqk32, u.msg_stime); 1452 CP(tmsqk, tmsqk32, u.msg_rtime); 1453 CP(tmsqk, tmsqk32, u.msg_ctime); 1454 /* Don't copy label or cred */ 1455 outaddr = &tmsqk32; 1456 outsize = sizeof(tmsqk32); 1457 } else 1458 #endif 1459 { 1460 /* Don't leak kernel pointers */ 1461 tmsqk.u.__msg_first = NULL; 1462 tmsqk.u.__msg_last = NULL; 1463 tmsqk.label = NULL; 1464 tmsqk.cred = NULL; 1465 /* 1466 * XXX: some padding also exists, but we take care to 1467 * allocate our pool of msqid_kernel structs with 1468 * zeroed memory so this should be OK. 1469 */ 1470 outaddr = &tmsqk; 1471 outsize = sizeof(tmsqk); 1472 } 1473 error = SYSCTL_OUT(req, outaddr, outsize); 1474 if (error != 0) 1475 break; 1476 } 1477 return (error); 1478 } 1479 1480 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmax, CTLFLAG_RD, &msginfo.msgmax, 0, 1481 "Maximum message size"); 1482 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmni, CTLFLAG_RDTUN, &msginfo.msgmni, 0, 1483 "Number of message queue identifiers"); 1484 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmnb, CTLFLAG_RDTUN, &msginfo.msgmnb, 0, 1485 "Maximum number of bytes in a queue"); 1486 SYSCTL_INT(_kern_ipc, OID_AUTO, msgtql, CTLFLAG_RDTUN, &msginfo.msgtql, 0, 1487 "Maximum number of messages in the system"); 1488 SYSCTL_INT(_kern_ipc, OID_AUTO, msgssz, CTLFLAG_RDTUN, &msginfo.msgssz, 0, 1489 "Size of a message segment"); 1490 SYSCTL_INT(_kern_ipc, OID_AUTO, msgseg, CTLFLAG_RDTUN, &msginfo.msgseg, 0, 1491 "Number of message segments"); 1492 SYSCTL_PROC(_kern_ipc, OID_AUTO, msqids, 1493 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, 1494 NULL, 0, sysctl_msqids, "", 1495 "Array of struct msqid_kernel for each potential message queue"); 1496 1497 static int 1498 msg_prison_check(void *obj, void *data) 1499 { 1500 struct prison *pr = obj; 1501 struct prison *prpr; 1502 struct vfsoptlist *opts = data; 1503 int error, jsys; 1504 1505 /* 1506 * sysvmsg is a jailsys integer. 1507 * It must be "disable" if the parent jail is disabled. 1508 */ 1509 error = vfs_copyopt(opts, "sysvmsg", &jsys, sizeof(jsys)); 1510 if (error != ENOENT) { 1511 if (error != 0) 1512 return (error); 1513 switch (jsys) { 1514 case JAIL_SYS_DISABLE: 1515 break; 1516 case JAIL_SYS_NEW: 1517 case JAIL_SYS_INHERIT: 1518 prison_lock(pr->pr_parent); 1519 prpr = osd_jail_get(pr->pr_parent, msg_prison_slot); 1520 prison_unlock(pr->pr_parent); 1521 if (prpr == NULL) 1522 return (EPERM); 1523 break; 1524 default: 1525 return (EINVAL); 1526 } 1527 } 1528 1529 return (0); 1530 } 1531 1532 static int 1533 msg_prison_set(void *obj, void *data) 1534 { 1535 struct prison *pr = obj; 1536 struct prison *tpr, *orpr, *nrpr, *trpr; 1537 struct vfsoptlist *opts = data; 1538 void *rsv; 1539 int jsys, descend; 1540 1541 /* 1542 * sysvmsg controls which jail is the root of the associated msgs (this 1543 * jail or same as the parent), or if the feature is available at all. 1544 */ 1545 if (vfs_copyopt(opts, "sysvmsg", &jsys, sizeof(jsys)) == ENOENT) 1546 jsys = vfs_flagopt(opts, "allow.sysvipc", NULL, 0) 1547 ? JAIL_SYS_INHERIT 1548 : vfs_flagopt(opts, "allow.nosysvipc", NULL, 0) 1549 ? JAIL_SYS_DISABLE 1550 : -1; 1551 if (jsys == JAIL_SYS_DISABLE) { 1552 prison_lock(pr); 1553 orpr = osd_jail_get(pr, msg_prison_slot); 1554 if (orpr != NULL) 1555 osd_jail_del(pr, msg_prison_slot); 1556 prison_unlock(pr); 1557 if (orpr != NULL) { 1558 if (orpr == pr) 1559 msg_prison_cleanup(pr); 1560 /* Disable all child jails as well. */ 1561 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1562 prison_lock(tpr); 1563 trpr = osd_jail_get(tpr, msg_prison_slot); 1564 if (trpr != NULL) { 1565 osd_jail_del(tpr, msg_prison_slot); 1566 prison_unlock(tpr); 1567 if (trpr == tpr) 1568 msg_prison_cleanup(tpr); 1569 } else { 1570 prison_unlock(tpr); 1571 descend = 0; 1572 } 1573 } 1574 } 1575 } else if (jsys != -1) { 1576 if (jsys == JAIL_SYS_NEW) 1577 nrpr = pr; 1578 else { 1579 prison_lock(pr->pr_parent); 1580 nrpr = osd_jail_get(pr->pr_parent, msg_prison_slot); 1581 prison_unlock(pr->pr_parent); 1582 } 1583 rsv = osd_reserve(msg_prison_slot); 1584 prison_lock(pr); 1585 orpr = osd_jail_get(pr, msg_prison_slot); 1586 if (orpr != nrpr) 1587 (void)osd_jail_set_reserved(pr, msg_prison_slot, rsv, 1588 nrpr); 1589 else 1590 osd_free_reserved(rsv); 1591 prison_unlock(pr); 1592 if (orpr != nrpr) { 1593 if (orpr == pr) 1594 msg_prison_cleanup(pr); 1595 if (orpr != NULL) { 1596 /* Change child jails matching the old root, */ 1597 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1598 prison_lock(tpr); 1599 trpr = osd_jail_get(tpr, 1600 msg_prison_slot); 1601 if (trpr == orpr) { 1602 (void)osd_jail_set(tpr, 1603 msg_prison_slot, nrpr); 1604 prison_unlock(tpr); 1605 if (trpr == tpr) 1606 msg_prison_cleanup(tpr); 1607 } else { 1608 prison_unlock(tpr); 1609 descend = 0; 1610 } 1611 } 1612 } 1613 } 1614 } 1615 1616 return (0); 1617 } 1618 1619 static int 1620 msg_prison_get(void *obj, void *data) 1621 { 1622 struct prison *pr = obj; 1623 struct prison *rpr; 1624 struct vfsoptlist *opts = data; 1625 int error, jsys; 1626 1627 /* Set sysvmsg based on the jail's root prison. */ 1628 prison_lock(pr); 1629 rpr = osd_jail_get(pr, msg_prison_slot); 1630 prison_unlock(pr); 1631 jsys = rpr == NULL ? JAIL_SYS_DISABLE 1632 : rpr == pr ? JAIL_SYS_NEW : JAIL_SYS_INHERIT; 1633 error = vfs_setopt(opts, "sysvmsg", &jsys, sizeof(jsys)); 1634 if (error == ENOENT) 1635 error = 0; 1636 return (error); 1637 } 1638 1639 static int 1640 msg_prison_remove(void *obj, void *data __unused) 1641 { 1642 struct prison *pr = obj; 1643 struct prison *rpr; 1644 1645 prison_lock(pr); 1646 rpr = osd_jail_get(pr, msg_prison_slot); 1647 prison_unlock(pr); 1648 if (rpr == pr) 1649 msg_prison_cleanup(pr); 1650 return (0); 1651 } 1652 1653 static void 1654 msg_prison_cleanup(struct prison *pr) 1655 { 1656 struct msqid_kernel *msqkptr; 1657 int i; 1658 1659 /* Remove any msqs that belong to this jail. */ 1660 mtx_lock(&msq_mtx); 1661 for (i = 0; i < msginfo.msgmni; i++) { 1662 msqkptr = &msqids[i]; 1663 if (msqkptr->u.msg_qbytes != 0 && 1664 msqkptr->cred != NULL && msqkptr->cred->cr_prison == pr) 1665 msq_remove(msqkptr); 1666 } 1667 mtx_unlock(&msq_mtx); 1668 } 1669 1670 SYSCTL_JAIL_PARAM_SYS_NODE(sysvmsg, CTLFLAG_RW, "SYSV message queues"); 1671 1672 #ifdef COMPAT_FREEBSD32 1673 int 1674 freebsd32_msgsys(struct thread *td, struct freebsd32_msgsys_args *uap) 1675 { 1676 1677 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1678 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1679 AUDIT_ARG_SVIPC_WHICH(uap->which); 1680 switch (uap->which) { 1681 case 0: 1682 return (freebsd7_freebsd32_msgctl(td, 1683 (struct freebsd7_freebsd32_msgctl_args *)&uap->a2)); 1684 case 2: 1685 return (freebsd32_msgsnd(td, 1686 (struct freebsd32_msgsnd_args *)&uap->a2)); 1687 case 3: 1688 return (freebsd32_msgrcv(td, 1689 (struct freebsd32_msgrcv_args *)&uap->a2)); 1690 default: 1691 return (sys_msgsys(td, (struct msgsys_args *)uap)); 1692 } 1693 #else 1694 return (nosys(td, NULL)); 1695 #endif 1696 } 1697 1698 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1699 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1700 int 1701 freebsd7_freebsd32_msgctl(struct thread *td, 1702 struct freebsd7_freebsd32_msgctl_args *uap) 1703 { 1704 struct msqid_ds msqbuf; 1705 struct msqid_ds_old32 msqbuf32; 1706 int error; 1707 1708 if (uap->cmd == IPC_SET) { 1709 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32)); 1710 if (error) 1711 return (error); 1712 freebsd32_ipcperm_old_in(&msqbuf32.msg_perm, &msqbuf.msg_perm); 1713 PTRIN_CP(msqbuf32, msqbuf, __msg_first); 1714 PTRIN_CP(msqbuf32, msqbuf, __msg_last); 1715 CP(msqbuf32, msqbuf, msg_cbytes); 1716 CP(msqbuf32, msqbuf, msg_qnum); 1717 CP(msqbuf32, msqbuf, msg_qbytes); 1718 CP(msqbuf32, msqbuf, msg_lspid); 1719 CP(msqbuf32, msqbuf, msg_lrpid); 1720 CP(msqbuf32, msqbuf, msg_stime); 1721 CP(msqbuf32, msqbuf, msg_rtime); 1722 CP(msqbuf32, msqbuf, msg_ctime); 1723 } 1724 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1725 if (error) 1726 return (error); 1727 if (uap->cmd == IPC_STAT) { 1728 bzero(&msqbuf32, sizeof(msqbuf32)); 1729 freebsd32_ipcperm_old_out(&msqbuf.msg_perm, &msqbuf32.msg_perm); 1730 PTROUT_CP(msqbuf, msqbuf32, __msg_first); 1731 PTROUT_CP(msqbuf, msqbuf32, __msg_last); 1732 CP(msqbuf, msqbuf32, msg_cbytes); 1733 CP(msqbuf, msqbuf32, msg_qnum); 1734 CP(msqbuf, msqbuf32, msg_qbytes); 1735 CP(msqbuf, msqbuf32, msg_lspid); 1736 CP(msqbuf, msqbuf32, msg_lrpid); 1737 CP(msqbuf, msqbuf32, msg_stime); 1738 CP(msqbuf, msqbuf32, msg_rtime); 1739 CP(msqbuf, msqbuf32, msg_ctime); 1740 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32)); 1741 } 1742 return (error); 1743 } 1744 #endif 1745 1746 int 1747 freebsd32_msgctl(struct thread *td, struct freebsd32_msgctl_args *uap) 1748 { 1749 struct msqid_ds msqbuf; 1750 struct msqid_ds32 msqbuf32; 1751 int error; 1752 1753 if (uap->cmd == IPC_SET) { 1754 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32)); 1755 if (error) 1756 return (error); 1757 freebsd32_ipcperm_in(&msqbuf32.msg_perm, &msqbuf.msg_perm); 1758 PTRIN_CP(msqbuf32, msqbuf, __msg_first); 1759 PTRIN_CP(msqbuf32, msqbuf, __msg_last); 1760 CP(msqbuf32, msqbuf, msg_cbytes); 1761 CP(msqbuf32, msqbuf, msg_qnum); 1762 CP(msqbuf32, msqbuf, msg_qbytes); 1763 CP(msqbuf32, msqbuf, msg_lspid); 1764 CP(msqbuf32, msqbuf, msg_lrpid); 1765 CP(msqbuf32, msqbuf, msg_stime); 1766 CP(msqbuf32, msqbuf, msg_rtime); 1767 CP(msqbuf32, msqbuf, msg_ctime); 1768 } 1769 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1770 if (error) 1771 return (error); 1772 if (uap->cmd == IPC_STAT) { 1773 freebsd32_ipcperm_out(&msqbuf.msg_perm, &msqbuf32.msg_perm); 1774 PTROUT_CP(msqbuf, msqbuf32, __msg_first); 1775 PTROUT_CP(msqbuf, msqbuf32, __msg_last); 1776 CP(msqbuf, msqbuf32, msg_cbytes); 1777 CP(msqbuf, msqbuf32, msg_qnum); 1778 CP(msqbuf, msqbuf32, msg_qbytes); 1779 CP(msqbuf, msqbuf32, msg_lspid); 1780 CP(msqbuf, msqbuf32, msg_lrpid); 1781 CP(msqbuf, msqbuf32, msg_stime); 1782 CP(msqbuf, msqbuf32, msg_rtime); 1783 CP(msqbuf, msqbuf32, msg_ctime); 1784 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32)); 1785 } 1786 return (error); 1787 } 1788 1789 int 1790 freebsd32_msgsnd(struct thread *td, struct freebsd32_msgsnd_args *uap) 1791 { 1792 const void *msgp; 1793 long mtype; 1794 int32_t mtype32; 1795 int error; 1796 1797 msgp = PTRIN(uap->msgp); 1798 if ((error = copyin(msgp, &mtype32, sizeof(mtype32))) != 0) 1799 return (error); 1800 mtype = mtype32; 1801 return (kern_msgsnd(td, uap->msqid, 1802 (const char *)msgp + sizeof(mtype32), 1803 uap->msgsz, uap->msgflg, mtype)); 1804 } 1805 1806 int 1807 freebsd32_msgrcv(struct thread *td, struct freebsd32_msgrcv_args *uap) 1808 { 1809 void *msgp; 1810 long mtype; 1811 int32_t mtype32; 1812 int error; 1813 1814 msgp = PTRIN(uap->msgp); 1815 if ((error = kern_msgrcv(td, uap->msqid, 1816 (char *)msgp + sizeof(mtype32), uap->msgsz, 1817 uap->msgtyp, uap->msgflg, &mtype)) != 0) 1818 return (error); 1819 mtype32 = (int32_t)mtype; 1820 return (copyout(&mtype32, msgp, sizeof(mtype32))); 1821 } 1822 #endif 1823 1824 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1825 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1826 1827 /* XXX casting to (sy_call_t *) is bogus, as usual. */ 1828 static sy_call_t *msgcalls[] = { 1829 (sy_call_t *)freebsd7_msgctl, (sy_call_t *)sys_msgget, 1830 (sy_call_t *)sys_msgsnd, (sy_call_t *)sys_msgrcv 1831 }; 1832 1833 /* 1834 * Entry point for all MSG calls. 1835 * 1836 * XXX actually varargs. 1837 * struct msgsys_args { 1838 * int which; 1839 * int a2; 1840 * int a3; 1841 * int a4; 1842 * int a5; 1843 * int a6; 1844 * } *uap; 1845 */ 1846 int 1847 sys_msgsys(struct thread *td, struct msgsys_args *uap) 1848 { 1849 int error; 1850 1851 AUDIT_ARG_SVIPC_WHICH(uap->which); 1852 if (uap->which < 0 || uap->which >= nitems(msgcalls)) 1853 return (EINVAL); 1854 error = (*msgcalls[uap->which])(td, &uap->a2); 1855 return (error); 1856 } 1857 1858 #ifndef CP 1859 #define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0) 1860 #endif 1861 1862 #ifndef _SYS_SYSPROTO_H_ 1863 struct freebsd7_msgctl_args { 1864 int msqid; 1865 int cmd; 1866 struct msqid_ds_old *buf; 1867 }; 1868 #endif 1869 int 1870 freebsd7_msgctl(struct thread *td, struct freebsd7_msgctl_args *uap) 1871 { 1872 struct msqid_ds_old msqold; 1873 struct msqid_ds msqbuf; 1874 int error; 1875 1876 DPRINTF(("call to freebsd7_msgctl(%d, %d, %p)\n", uap->msqid, uap->cmd, 1877 uap->buf)); 1878 if (uap->cmd == IPC_SET) { 1879 error = copyin(uap->buf, &msqold, sizeof(msqold)); 1880 if (error) 1881 return (error); 1882 ipcperm_old2new(&msqold.msg_perm, &msqbuf.msg_perm); 1883 CP(msqold, msqbuf, __msg_first); 1884 CP(msqold, msqbuf, __msg_last); 1885 CP(msqold, msqbuf, msg_cbytes); 1886 CP(msqold, msqbuf, msg_qnum); 1887 CP(msqold, msqbuf, msg_qbytes); 1888 CP(msqold, msqbuf, msg_lspid); 1889 CP(msqold, msqbuf, msg_lrpid); 1890 CP(msqold, msqbuf, msg_stime); 1891 CP(msqold, msqbuf, msg_rtime); 1892 CP(msqold, msqbuf, msg_ctime); 1893 } 1894 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1895 if (error) 1896 return (error); 1897 if (uap->cmd == IPC_STAT) { 1898 bzero(&msqold, sizeof(msqold)); 1899 ipcperm_new2old(&msqbuf.msg_perm, &msqold.msg_perm); 1900 CP(msqbuf, msqold, __msg_first); 1901 CP(msqbuf, msqold, __msg_last); 1902 CP(msqbuf, msqold, msg_cbytes); 1903 CP(msqbuf, msqold, msg_qnum); 1904 CP(msqbuf, msqold, msg_qbytes); 1905 CP(msqbuf, msqold, msg_lspid); 1906 CP(msqbuf, msqold, msg_lrpid); 1907 CP(msqbuf, msqold, msg_stime); 1908 CP(msqbuf, msqold, msg_rtime); 1909 CP(msqbuf, msqold, msg_ctime); 1910 error = copyout(&msqold, uap->buf, sizeof(struct msqid_ds_old)); 1911 } 1912 return (error); 1913 } 1914 1915 #undef CP 1916 1917 #endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 || 1918 COMPAT_FREEBSD7 */ 1919