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 * Copyright (c) 2003-2005 McAfee, Inc. 21 * All rights reserved. 22 * 23 * This software was developed for the FreeBSD Project in part by McAfee 24 * Research, the Security Research Division of McAfee, Inc under DARPA/SPAWAR 25 * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS research 26 * program. 27 * 28 * Redistribution and use in source and binary forms, with or without 29 * modification, are permitted provided that the following conditions 30 * are met: 31 * 1. Redistributions of source code must retain the above copyright 32 * notice, this list of conditions and the following disclaimer. 33 * 2. Redistributions in binary form must reproduce the above copyright 34 * notice, this list of conditions and the following disclaimer in the 35 * documentation and/or other materials provided with the distribution. 36 * 37 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 38 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 39 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 40 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 41 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 42 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 43 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 45 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 46 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 47 * SUCH DAMAGE. 48 */ 49 50 #include <sys/cdefs.h> 51 __FBSDID("$FreeBSD$"); 52 53 #include "opt_compat.h" 54 #include "opt_sysvipc.h" 55 56 #include <sys/param.h> 57 #include <sys/systm.h> 58 #include <sys/sysproto.h> 59 #include <sys/kernel.h> 60 #include <sys/priv.h> 61 #include <sys/proc.h> 62 #include <sys/lock.h> 63 #include <sys/mutex.h> 64 #include <sys/module.h> 65 #include <sys/msg.h> 66 #include <sys/syscall.h> 67 #include <sys/syscallsubr.h> 68 #include <sys/sysent.h> 69 #include <sys/sysctl.h> 70 #include <sys/malloc.h> 71 #include <sys/jail.h> 72 73 #include <security/mac/mac_framework.h> 74 75 static MALLOC_DEFINE(M_MSG, "msg", "SVID compatible message queues"); 76 77 static void msginit(void); 78 static int msgunload(void); 79 static int sysvmsg_modload(struct module *, int, void *); 80 81 #ifdef MSG_DEBUG 82 #define DPRINTF(a) printf a 83 #else 84 #define DPRINTF(a) (void)0 85 #endif 86 87 static void msg_freehdr(struct msg *msghdr); 88 89 #ifndef MSGSSZ 90 #define MSGSSZ 8 /* Each segment must be 2^N long */ 91 #endif 92 #ifndef MSGSEG 93 #define MSGSEG 2048 /* must be less than 32767 */ 94 #endif 95 #define MSGMAX (MSGSSZ*MSGSEG) 96 #ifndef MSGMNB 97 #define MSGMNB 2048 /* max # of bytes in a queue */ 98 #endif 99 #ifndef MSGMNI 100 #define MSGMNI 40 101 #endif 102 #ifndef MSGTQL 103 #define MSGTQL 40 104 #endif 105 106 /* 107 * Based on the configuration parameters described in an SVR2 (yes, two) 108 * config(1m) man page. 109 * 110 * Each message is broken up and stored in segments that are msgssz bytes 111 * long. For efficiency reasons, this should be a power of two. Also, 112 * it doesn't make sense if it is less than 8 or greater than about 256. 113 * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of 114 * two between 8 and 1024 inclusive (and panic's if it isn't). 115 */ 116 struct msginfo msginfo = { 117 MSGMAX, /* max chars in a message */ 118 MSGMNI, /* # of message queue identifiers */ 119 MSGMNB, /* max chars in a queue */ 120 MSGTQL, /* max messages in system */ 121 MSGSSZ, /* size of a message segment */ 122 /* (must be small power of 2 greater than 4) */ 123 MSGSEG /* number of message segments */ 124 }; 125 126 /* 127 * macros to convert between msqid_ds's and msqid's. 128 * (specific to this implementation) 129 */ 130 #define MSQID(ix,ds) ((ix) & 0xffff | (((ds).msg_perm.seq << 16) & 0xffff0000)) 131 #define MSQID_IX(id) ((id) & 0xffff) 132 #define MSQID_SEQ(id) (((id) >> 16) & 0xffff) 133 134 /* 135 * The rest of this file is specific to this particular implementation. 136 */ 137 138 struct msgmap { 139 short next; /* next segment in buffer */ 140 /* -1 -> available */ 141 /* 0..(MSGSEG-1) -> index of next segment */ 142 }; 143 144 #define MSG_LOCKED 01000 /* Is this msqid_ds locked? */ 145 146 static int nfree_msgmaps; /* # of free map entries */ 147 static short free_msgmaps; /* head of linked list of free map entries */ 148 static struct msg *free_msghdrs;/* list of free msg headers */ 149 static char *msgpool; /* MSGMAX byte long msg buffer pool */ 150 static struct msgmap *msgmaps; /* MSGSEG msgmap structures */ 151 static struct msg *msghdrs; /* MSGTQL msg headers */ 152 static struct msqid_kernel *msqids; /* MSGMNI msqid_kernel struct's */ 153 static struct mtx msq_mtx; /* global mutex for message queues. */ 154 155 static void 156 msginit() 157 { 158 register int i; 159 160 TUNABLE_INT_FETCH("kern.ipc.msgseg", &msginfo.msgseg); 161 TUNABLE_INT_FETCH("kern.ipc.msgssz", &msginfo.msgssz); 162 msginfo.msgmax = msginfo.msgseg * msginfo.msgssz; 163 TUNABLE_INT_FETCH("kern.ipc.msgmni", &msginfo.msgmni); 164 TUNABLE_INT_FETCH("kern.ipc.msgmnb", &msginfo.msgmnb); 165 TUNABLE_INT_FETCH("kern.ipc.msgtql", &msginfo.msgtql); 166 167 msgpool = malloc(msginfo.msgmax, M_MSG, M_WAITOK); 168 if (msgpool == NULL) 169 panic("msgpool is NULL"); 170 msgmaps = malloc(sizeof(struct msgmap) * msginfo.msgseg, M_MSG, M_WAITOK); 171 if (msgmaps == NULL) 172 panic("msgmaps is NULL"); 173 msghdrs = malloc(sizeof(struct msg) * msginfo.msgtql, M_MSG, M_WAITOK); 174 if (msghdrs == NULL) 175 panic("msghdrs is NULL"); 176 msqids = malloc(sizeof(struct msqid_kernel) * msginfo.msgmni, M_MSG, 177 M_WAITOK); 178 if (msqids == NULL) 179 panic("msqids is NULL"); 180 181 /* 182 * msginfo.msgssz should be a power of two for efficiency reasons. 183 * It is also pretty silly if msginfo.msgssz is less than 8 184 * or greater than about 256 so ... 185 */ 186 187 i = 8; 188 while (i < 1024 && i != msginfo.msgssz) 189 i <<= 1; 190 if (i != msginfo.msgssz) { 191 DPRINTF(("msginfo.msgssz=%d (0x%x)\n", msginfo.msgssz, 192 msginfo.msgssz)); 193 panic("msginfo.msgssz not a small power of 2"); 194 } 195 196 if (msginfo.msgseg > 32767) { 197 DPRINTF(("msginfo.msgseg=%d\n", msginfo.msgseg)); 198 panic("msginfo.msgseg > 32767"); 199 } 200 201 if (msgmaps == NULL) 202 panic("msgmaps is NULL"); 203 204 for (i = 0; i < msginfo.msgseg; i++) { 205 if (i > 0) 206 msgmaps[i-1].next = i; 207 msgmaps[i].next = -1; /* implies entry is available */ 208 } 209 free_msgmaps = 0; 210 nfree_msgmaps = msginfo.msgseg; 211 212 if (msghdrs == NULL) 213 panic("msghdrs is NULL"); 214 215 for (i = 0; i < msginfo.msgtql; i++) { 216 msghdrs[i].msg_type = 0; 217 if (i > 0) 218 msghdrs[i-1].msg_next = &msghdrs[i]; 219 msghdrs[i].msg_next = NULL; 220 #ifdef MAC 221 mac_sysvmsg_init(&msghdrs[i]); 222 #endif 223 } 224 free_msghdrs = &msghdrs[0]; 225 226 if (msqids == NULL) 227 panic("msqids is NULL"); 228 229 for (i = 0; i < msginfo.msgmni; i++) { 230 msqids[i].u.msg_qbytes = 0; /* implies entry is available */ 231 msqids[i].u.msg_perm.seq = 0; /* reset to a known value */ 232 msqids[i].u.msg_perm.mode = 0; 233 #ifdef MAC 234 mac_sysvmsq_init(&msqids[i]); 235 #endif 236 } 237 mtx_init(&msq_mtx, "msq", NULL, MTX_DEF); 238 } 239 240 static int 241 msgunload() 242 { 243 struct msqid_kernel *msqkptr; 244 int msqid; 245 #ifdef MAC 246 int i; 247 #endif 248 249 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 250 /* 251 * Look for an unallocated and unlocked msqid_ds. 252 * msqid_ds's can be locked by msgsnd or msgrcv while 253 * they are copying the message in/out. We can't 254 * re-use the entry until they release it. 255 */ 256 msqkptr = &msqids[msqid]; 257 if (msqkptr->u.msg_qbytes != 0 || 258 (msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) 259 break; 260 } 261 if (msqid != msginfo.msgmni) 262 return (EBUSY); 263 264 #ifdef MAC 265 for (i = 0; i < msginfo.msgtql; i++) 266 mac_sysvmsg_destroy(&msghdrs[i]); 267 for (msqid = 0; msqid < msginfo.msgmni; msqid++) 268 mac_sysvmsq_destroy(&msqids[msqid]); 269 #endif 270 free(msgpool, M_MSG); 271 free(msgmaps, M_MSG); 272 free(msghdrs, M_MSG); 273 free(msqids, M_MSG); 274 mtx_destroy(&msq_mtx); 275 return (0); 276 } 277 278 279 static int 280 sysvmsg_modload(struct module *module, int cmd, void *arg) 281 { 282 int error = 0; 283 284 switch (cmd) { 285 case MOD_LOAD: 286 msginit(); 287 break; 288 case MOD_UNLOAD: 289 error = msgunload(); 290 break; 291 case MOD_SHUTDOWN: 292 break; 293 default: 294 error = EINVAL; 295 break; 296 } 297 return (error); 298 } 299 300 static moduledata_t sysvmsg_mod = { 301 "sysvmsg", 302 &sysvmsg_modload, 303 NULL 304 }; 305 306 SYSCALL_MODULE_HELPER(msgctl); 307 SYSCALL_MODULE_HELPER(msgget); 308 SYSCALL_MODULE_HELPER(msgsnd); 309 SYSCALL_MODULE_HELPER(msgrcv); 310 311 DECLARE_MODULE(sysvmsg, sysvmsg_mod, SI_SUB_SYSV_MSG, SI_ORDER_FIRST); 312 MODULE_VERSION(sysvmsg, 1); 313 314 static void 315 msg_freehdr(msghdr) 316 struct msg *msghdr; 317 { 318 while (msghdr->msg_ts > 0) { 319 short next; 320 if (msghdr->msg_spot < 0 || msghdr->msg_spot >= msginfo.msgseg) 321 panic("msghdr->msg_spot out of range"); 322 next = msgmaps[msghdr->msg_spot].next; 323 msgmaps[msghdr->msg_spot].next = free_msgmaps; 324 free_msgmaps = msghdr->msg_spot; 325 nfree_msgmaps++; 326 msghdr->msg_spot = next; 327 if (msghdr->msg_ts >= msginfo.msgssz) 328 msghdr->msg_ts -= msginfo.msgssz; 329 else 330 msghdr->msg_ts = 0; 331 } 332 if (msghdr->msg_spot != -1) 333 panic("msghdr->msg_spot != -1"); 334 msghdr->msg_next = free_msghdrs; 335 free_msghdrs = msghdr; 336 #ifdef MAC 337 mac_sysvmsg_cleanup(msghdr); 338 #endif 339 } 340 341 #ifndef _SYS_SYSPROTO_H_ 342 struct msgctl_args { 343 int msqid; 344 int cmd; 345 struct msqid_ds *buf; 346 }; 347 #endif 348 int 349 msgctl(td, uap) 350 struct thread *td; 351 register struct msgctl_args *uap; 352 { 353 int msqid = uap->msqid; 354 int cmd = uap->cmd; 355 struct msqid_ds msqbuf; 356 int error; 357 358 DPRINTF(("call to msgctl(%d, %d, %p)\n", msqid, cmd, uap->buf)); 359 if (cmd == IPC_SET && 360 (error = copyin(uap->buf, &msqbuf, sizeof(msqbuf))) != 0) 361 return (error); 362 error = kern_msgctl(td, msqid, cmd, &msqbuf); 363 if (cmd == IPC_STAT && error == 0) 364 error = copyout(&msqbuf, uap->buf, sizeof(struct msqid_ds)); 365 return (error); 366 } 367 368 int 369 kern_msgctl(td, msqid, cmd, msqbuf) 370 struct thread *td; 371 int msqid; 372 int cmd; 373 struct msqid_ds *msqbuf; 374 { 375 int rval, error, msqix; 376 register struct msqid_kernel *msqkptr; 377 378 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 379 return (ENOSYS); 380 381 msqix = IPCID_TO_IX(msqid); 382 383 if (msqix < 0 || msqix >= msginfo.msgmni) { 384 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 385 msginfo.msgmni)); 386 return (EINVAL); 387 } 388 389 msqkptr = &msqids[msqix]; 390 391 mtx_lock(&msq_mtx); 392 if (msqkptr->u.msg_qbytes == 0) { 393 DPRINTF(("no such msqid\n")); 394 error = EINVAL; 395 goto done2; 396 } 397 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 398 DPRINTF(("wrong sequence number\n")); 399 error = EINVAL; 400 goto done2; 401 } 402 #ifdef MAC 403 error = mac_sysvmsq_check_msqctl(td->td_ucred, msqkptr, cmd); 404 if (error != 0) 405 goto done2; 406 #endif 407 408 error = 0; 409 rval = 0; 410 411 switch (cmd) { 412 413 case IPC_RMID: 414 { 415 struct msg *msghdr; 416 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M))) 417 goto done2; 418 419 #ifdef MAC 420 /* 421 * Check that the thread has MAC access permissions to 422 * individual msghdrs. Note: We need to do this in a 423 * separate loop because the actual loop alters the 424 * msq/msghdr info as it progresses, and there is no going 425 * back if half the way through we discover that the 426 * thread cannot free a certain msghdr. The msq will get 427 * into an inconsistent state. 428 */ 429 for (msghdr = msqkptr->u.msg_first; msghdr != NULL; 430 msghdr = msghdr->msg_next) { 431 error = mac_sysvmsq_check_msgrmid(td->td_ucred, msghdr); 432 if (error != 0) 433 goto done2; 434 } 435 #endif 436 437 /* Free the message headers */ 438 msghdr = msqkptr->u.msg_first; 439 while (msghdr != NULL) { 440 struct msg *msghdr_tmp; 441 442 /* Free the segments of each message */ 443 msqkptr->u.msg_cbytes -= msghdr->msg_ts; 444 msqkptr->u.msg_qnum--; 445 msghdr_tmp = msghdr; 446 msghdr = msghdr->msg_next; 447 msg_freehdr(msghdr_tmp); 448 } 449 450 if (msqkptr->u.msg_cbytes != 0) 451 panic("msg_cbytes is screwed up"); 452 if (msqkptr->u.msg_qnum != 0) 453 panic("msg_qnum is screwed up"); 454 455 msqkptr->u.msg_qbytes = 0; /* Mark it as free */ 456 457 #ifdef MAC 458 mac_sysvmsq_cleanup(msqkptr); 459 #endif 460 461 wakeup(msqkptr); 462 } 463 464 break; 465 466 case IPC_SET: 467 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M))) 468 goto done2; 469 if (msqbuf->msg_qbytes > msqkptr->u.msg_qbytes) { 470 error = priv_check(td, PRIV_IPC_MSGSIZE); 471 if (error) 472 goto done2; 473 } 474 if (msqbuf->msg_qbytes > msginfo.msgmnb) { 475 DPRINTF(("can't increase msg_qbytes beyond %d" 476 "(truncating)\n", msginfo.msgmnb)); 477 msqbuf->msg_qbytes = msginfo.msgmnb; /* silently restrict qbytes to system limit */ 478 } 479 if (msqbuf->msg_qbytes == 0) { 480 DPRINTF(("can't reduce msg_qbytes to 0\n")); 481 error = EINVAL; /* non-standard errno! */ 482 goto done2; 483 } 484 msqkptr->u.msg_perm.uid = msqbuf->msg_perm.uid; /* change the owner */ 485 msqkptr->u.msg_perm.gid = msqbuf->msg_perm.gid; /* change the owner */ 486 msqkptr->u.msg_perm.mode = (msqkptr->u.msg_perm.mode & ~0777) | 487 (msqbuf->msg_perm.mode & 0777); 488 msqkptr->u.msg_qbytes = msqbuf->msg_qbytes; 489 msqkptr->u.msg_ctime = time_second; 490 break; 491 492 case IPC_STAT: 493 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) { 494 DPRINTF(("requester doesn't have read access\n")); 495 goto done2; 496 } 497 *msqbuf = msqkptr->u; 498 break; 499 500 default: 501 DPRINTF(("invalid command %d\n", cmd)); 502 error = EINVAL; 503 goto done2; 504 } 505 506 if (error == 0) 507 td->td_retval[0] = rval; 508 done2: 509 mtx_unlock(&msq_mtx); 510 return (error); 511 } 512 513 #ifndef _SYS_SYSPROTO_H_ 514 struct msgget_args { 515 key_t key; 516 int msgflg; 517 }; 518 #endif 519 int 520 msgget(td, uap) 521 struct thread *td; 522 register struct msgget_args *uap; 523 { 524 int msqid, error = 0; 525 int key = uap->key; 526 int msgflg = uap->msgflg; 527 struct ucred *cred = td->td_ucred; 528 register struct msqid_kernel *msqkptr = NULL; 529 530 DPRINTF(("msgget(0x%x, 0%o)\n", key, msgflg)); 531 532 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 533 return (ENOSYS); 534 535 mtx_lock(&msq_mtx); 536 if (key != IPC_PRIVATE) { 537 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 538 msqkptr = &msqids[msqid]; 539 if (msqkptr->u.msg_qbytes != 0 && 540 msqkptr->u.msg_perm.key == key) 541 break; 542 } 543 if (msqid < msginfo.msgmni) { 544 DPRINTF(("found public key\n")); 545 if ((msgflg & IPC_CREAT) && (msgflg & IPC_EXCL)) { 546 DPRINTF(("not exclusive\n")); 547 error = EEXIST; 548 goto done2; 549 } 550 if ((error = ipcperm(td, &msqkptr->u.msg_perm, 551 msgflg & 0700))) { 552 DPRINTF(("requester doesn't have 0%o access\n", 553 msgflg & 0700)); 554 goto done2; 555 } 556 #ifdef MAC 557 error = mac_sysvmsq_check_msqget(cred, msqkptr); 558 if (error != 0) 559 goto done2; 560 #endif 561 goto found; 562 } 563 } 564 565 DPRINTF(("need to allocate the msqid_ds\n")); 566 if (key == IPC_PRIVATE || (msgflg & IPC_CREAT)) { 567 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 568 /* 569 * Look for an unallocated and unlocked msqid_ds. 570 * msqid_ds's can be locked by msgsnd or msgrcv while 571 * they are copying the message in/out. We can't 572 * re-use the entry until they release it. 573 */ 574 msqkptr = &msqids[msqid]; 575 if (msqkptr->u.msg_qbytes == 0 && 576 (msqkptr->u.msg_perm.mode & MSG_LOCKED) == 0) 577 break; 578 } 579 if (msqid == msginfo.msgmni) { 580 DPRINTF(("no more msqid_ds's available\n")); 581 error = ENOSPC; 582 goto done2; 583 } 584 DPRINTF(("msqid %d is available\n", msqid)); 585 msqkptr->u.msg_perm.key = key; 586 msqkptr->u.msg_perm.cuid = cred->cr_uid; 587 msqkptr->u.msg_perm.uid = cred->cr_uid; 588 msqkptr->u.msg_perm.cgid = cred->cr_gid; 589 msqkptr->u.msg_perm.gid = cred->cr_gid; 590 msqkptr->u.msg_perm.mode = (msgflg & 0777); 591 /* Make sure that the returned msqid is unique */ 592 msqkptr->u.msg_perm.seq = (msqkptr->u.msg_perm.seq + 1) & 0x7fff; 593 msqkptr->u.msg_first = NULL; 594 msqkptr->u.msg_last = NULL; 595 msqkptr->u.msg_cbytes = 0; 596 msqkptr->u.msg_qnum = 0; 597 msqkptr->u.msg_qbytes = msginfo.msgmnb; 598 msqkptr->u.msg_lspid = 0; 599 msqkptr->u.msg_lrpid = 0; 600 msqkptr->u.msg_stime = 0; 601 msqkptr->u.msg_rtime = 0; 602 msqkptr->u.msg_ctime = time_second; 603 #ifdef MAC 604 mac_sysvmsq_create(cred, msqkptr); 605 #endif 606 } else { 607 DPRINTF(("didn't find it and wasn't asked to create it\n")); 608 error = ENOENT; 609 goto done2; 610 } 611 612 found: 613 /* Construct the unique msqid */ 614 td->td_retval[0] = IXSEQ_TO_IPCID(msqid, msqkptr->u.msg_perm); 615 done2: 616 mtx_unlock(&msq_mtx); 617 return (error); 618 } 619 620 #ifndef _SYS_SYSPROTO_H_ 621 struct msgsnd_args { 622 int msqid; 623 const void *msgp; 624 size_t msgsz; 625 int msgflg; 626 }; 627 #endif 628 int 629 kern_msgsnd(td, msqid, msgp, msgsz, msgflg, mtype) 630 struct thread *td; 631 int msqid; 632 const void *msgp; /* XXX msgp is actually mtext. */ 633 size_t msgsz; 634 int msgflg; 635 long mtype; 636 { 637 int msqix, segs_needed, error = 0; 638 register struct msqid_kernel *msqkptr; 639 register struct msg *msghdr; 640 short next; 641 642 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 643 return (ENOSYS); 644 645 mtx_lock(&msq_mtx); 646 msqix = IPCID_TO_IX(msqid); 647 648 if (msqix < 0 || msqix >= msginfo.msgmni) { 649 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 650 msginfo.msgmni)); 651 error = EINVAL; 652 goto done2; 653 } 654 655 msqkptr = &msqids[msqix]; 656 if (msqkptr->u.msg_qbytes == 0) { 657 DPRINTF(("no such message queue id\n")); 658 error = EINVAL; 659 goto done2; 660 } 661 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 662 DPRINTF(("wrong sequence number\n")); 663 error = EINVAL; 664 goto done2; 665 } 666 667 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_W))) { 668 DPRINTF(("requester doesn't have write access\n")); 669 goto done2; 670 } 671 672 #ifdef MAC 673 error = mac_sysvmsq_check_msqsnd(td->td_ucred, msqkptr); 674 if (error != 0) 675 goto done2; 676 #endif 677 678 segs_needed = (msgsz + msginfo.msgssz - 1) / msginfo.msgssz; 679 DPRINTF(("msgsz=%zu, msgssz=%d, segs_needed=%d\n", msgsz, 680 msginfo.msgssz, segs_needed)); 681 for (;;) { 682 int need_more_resources = 0; 683 684 /* 685 * check msgsz 686 * (inside this loop in case msg_qbytes changes while we sleep) 687 */ 688 689 if (msgsz > msqkptr->u.msg_qbytes) { 690 DPRINTF(("msgsz > msqkptr->u.msg_qbytes\n")); 691 error = EINVAL; 692 goto done2; 693 } 694 695 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) { 696 DPRINTF(("msqid is locked\n")); 697 need_more_resources = 1; 698 } 699 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) { 700 DPRINTF(("msgsz + msg_cbytes > msg_qbytes\n")); 701 need_more_resources = 1; 702 } 703 if (segs_needed > nfree_msgmaps) { 704 DPRINTF(("segs_needed > nfree_msgmaps\n")); 705 need_more_resources = 1; 706 } 707 if (free_msghdrs == NULL) { 708 DPRINTF(("no more msghdrs\n")); 709 need_more_resources = 1; 710 } 711 712 if (need_more_resources) { 713 int we_own_it; 714 715 if ((msgflg & IPC_NOWAIT) != 0) { 716 DPRINTF(("need more resources but caller " 717 "doesn't want to wait\n")); 718 error = EAGAIN; 719 goto done2; 720 } 721 722 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) { 723 DPRINTF(("we don't own the msqid_ds\n")); 724 we_own_it = 0; 725 } else { 726 /* Force later arrivals to wait for our 727 request */ 728 DPRINTF(("we own the msqid_ds\n")); 729 msqkptr->u.msg_perm.mode |= MSG_LOCKED; 730 we_own_it = 1; 731 } 732 DPRINTF(("msgsnd: goodnight\n")); 733 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH, 734 "msgsnd", hz); 735 DPRINTF(("msgsnd: good morning, error=%d\n", error)); 736 if (we_own_it) 737 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 738 if (error == EWOULDBLOCK) { 739 DPRINTF(("msgsnd: timed out\n")); 740 continue; 741 } 742 if (error != 0) { 743 DPRINTF(("msgsnd: interrupted system call\n")); 744 error = EINTR; 745 goto done2; 746 } 747 748 /* 749 * Make sure that the msq queue still exists 750 */ 751 752 if (msqkptr->u.msg_qbytes == 0) { 753 DPRINTF(("msqid deleted\n")); 754 error = EIDRM; 755 goto done2; 756 } 757 758 } else { 759 DPRINTF(("got all the resources that we need\n")); 760 break; 761 } 762 } 763 764 /* 765 * We have the resources that we need. 766 * Make sure! 767 */ 768 769 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) 770 panic("msg_perm.mode & MSG_LOCKED"); 771 if (segs_needed > nfree_msgmaps) 772 panic("segs_needed > nfree_msgmaps"); 773 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) 774 panic("msgsz + msg_cbytes > msg_qbytes"); 775 if (free_msghdrs == NULL) 776 panic("no more msghdrs"); 777 778 /* 779 * Re-lock the msqid_ds in case we page-fault when copying in the 780 * message 781 */ 782 783 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) 784 panic("msqid_ds is already locked"); 785 msqkptr->u.msg_perm.mode |= MSG_LOCKED; 786 787 /* 788 * Allocate a message header 789 */ 790 791 msghdr = free_msghdrs; 792 free_msghdrs = msghdr->msg_next; 793 msghdr->msg_spot = -1; 794 msghdr->msg_ts = msgsz; 795 msghdr->msg_type = mtype; 796 #ifdef MAC 797 /* 798 * XXXMAC: Should the mac_sysvmsq_check_msgmsq check follow here 799 * immediately? Or, should it be checked just before the msg is 800 * enqueued in the msgq (as it is done now)? 801 */ 802 mac_sysvmsg_create(td->td_ucred, msqkptr, msghdr); 803 #endif 804 805 /* 806 * Allocate space for the message 807 */ 808 809 while (segs_needed > 0) { 810 if (nfree_msgmaps <= 0) 811 panic("not enough msgmaps"); 812 if (free_msgmaps == -1) 813 panic("nil free_msgmaps"); 814 next = free_msgmaps; 815 if (next <= -1) 816 panic("next too low #1"); 817 if (next >= msginfo.msgseg) 818 panic("next out of range #1"); 819 DPRINTF(("allocating segment %d to message\n", next)); 820 free_msgmaps = msgmaps[next].next; 821 nfree_msgmaps--; 822 msgmaps[next].next = msghdr->msg_spot; 823 msghdr->msg_spot = next; 824 segs_needed--; 825 } 826 827 /* 828 * Validate the message type 829 */ 830 831 if (msghdr->msg_type < 1) { 832 msg_freehdr(msghdr); 833 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 834 wakeup(msqkptr); 835 DPRINTF(("mtype (%ld) < 1\n", msghdr->msg_type)); 836 error = EINVAL; 837 goto done2; 838 } 839 840 /* 841 * Copy in the message body 842 */ 843 844 next = msghdr->msg_spot; 845 while (msgsz > 0) { 846 size_t tlen; 847 if (msgsz > msginfo.msgssz) 848 tlen = msginfo.msgssz; 849 else 850 tlen = msgsz; 851 if (next <= -1) 852 panic("next too low #2"); 853 if (next >= msginfo.msgseg) 854 panic("next out of range #2"); 855 mtx_unlock(&msq_mtx); 856 if ((error = copyin(msgp, &msgpool[next * msginfo.msgssz], 857 tlen)) != 0) { 858 mtx_lock(&msq_mtx); 859 DPRINTF(("error %d copying in message segment\n", 860 error)); 861 msg_freehdr(msghdr); 862 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 863 wakeup(msqkptr); 864 goto done2; 865 } 866 mtx_lock(&msq_mtx); 867 msgsz -= tlen; 868 msgp = (const char *)msgp + tlen; 869 next = msgmaps[next].next; 870 } 871 if (next != -1) 872 panic("didn't use all the msg segments"); 873 874 /* 875 * We've got the message. Unlock the msqid_ds. 876 */ 877 878 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 879 880 /* 881 * Make sure that the msqid_ds is still allocated. 882 */ 883 884 if (msqkptr->u.msg_qbytes == 0) { 885 msg_freehdr(msghdr); 886 wakeup(msqkptr); 887 error = EIDRM; 888 goto done2; 889 } 890 891 #ifdef MAC 892 /* 893 * Note: Since the task/thread allocates the msghdr and usually 894 * primes it with its own MAC label, for a majority of policies, it 895 * won't be necessary to check whether the msghdr has access 896 * permissions to the msgq. The mac_sysvmsq_check_msqsnd check would 897 * suffice in that case. However, this hook may be required where 898 * individual policies derive a non-identical label for the msghdr 899 * from the current thread label and may want to check the msghdr 900 * enqueue permissions, along with read/write permissions to the 901 * msgq. 902 */ 903 error = mac_sysvmsq_check_msgmsq(td->td_ucred, msghdr, msqkptr); 904 if (error != 0) { 905 msg_freehdr(msghdr); 906 wakeup(msqkptr); 907 goto done2; 908 } 909 #endif 910 911 /* 912 * Put the message into the queue 913 */ 914 if (msqkptr->u.msg_first == NULL) { 915 msqkptr->u.msg_first = msghdr; 916 msqkptr->u.msg_last = msghdr; 917 } else { 918 msqkptr->u.msg_last->msg_next = msghdr; 919 msqkptr->u.msg_last = msghdr; 920 } 921 msqkptr->u.msg_last->msg_next = NULL; 922 923 msqkptr->u.msg_cbytes += msghdr->msg_ts; 924 msqkptr->u.msg_qnum++; 925 msqkptr->u.msg_lspid = td->td_proc->p_pid; 926 msqkptr->u.msg_stime = time_second; 927 928 wakeup(msqkptr); 929 td->td_retval[0] = 0; 930 done2: 931 mtx_unlock(&msq_mtx); 932 return (error); 933 } 934 935 int 936 msgsnd(td, uap) 937 struct thread *td; 938 register struct msgsnd_args *uap; 939 { 940 int error; 941 long mtype; 942 943 DPRINTF(("call to msgsnd(%d, %p, %zu, %d)\n", uap->msqid, uap->msgp, 944 uap->msgsz, uap->msgflg)); 945 946 if ((error = copyin(uap->msgp, &mtype, sizeof(mtype))) != 0) { 947 DPRINTF(("error %d copying the message type\n", error)); 948 return (error); 949 } 950 return (kern_msgsnd(td, uap->msqid, 951 (const char *)uap->msgp + sizeof(mtype), 952 uap->msgsz, uap->msgflg, mtype)); 953 } 954 955 #ifndef _SYS_SYSPROTO_H_ 956 struct msgrcv_args { 957 int msqid; 958 void *msgp; 959 size_t msgsz; 960 long msgtyp; 961 int msgflg; 962 }; 963 #endif 964 int 965 kern_msgrcv(td, msqid, msgp, msgsz, msgtyp, msgflg, mtype) 966 struct thread *td; 967 int msqid; 968 void *msgp; /* XXX msgp is actually mtext. */ 969 size_t msgsz; 970 long msgtyp; 971 int msgflg; 972 long *mtype; 973 { 974 size_t len; 975 register struct msqid_kernel *msqkptr; 976 register struct msg *msghdr; 977 int msqix, error = 0; 978 short next; 979 980 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 981 return (ENOSYS); 982 983 msqix = IPCID_TO_IX(msqid); 984 985 if (msqix < 0 || msqix >= msginfo.msgmni) { 986 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 987 msginfo.msgmni)); 988 return (EINVAL); 989 } 990 991 msqkptr = &msqids[msqix]; 992 mtx_lock(&msq_mtx); 993 if (msqkptr->u.msg_qbytes == 0) { 994 DPRINTF(("no such message queue id\n")); 995 error = EINVAL; 996 goto done2; 997 } 998 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 999 DPRINTF(("wrong sequence number\n")); 1000 error = EINVAL; 1001 goto done2; 1002 } 1003 1004 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) { 1005 DPRINTF(("requester doesn't have read access\n")); 1006 goto done2; 1007 } 1008 1009 #ifdef MAC 1010 error = mac_sysvmsq_check_msqrcv(td->td_ucred, msqkptr); 1011 if (error != 0) 1012 goto done2; 1013 #endif 1014 1015 msghdr = NULL; 1016 while (msghdr == NULL) { 1017 if (msgtyp == 0) { 1018 msghdr = msqkptr->u.msg_first; 1019 if (msghdr != NULL) { 1020 if (msgsz < msghdr->msg_ts && 1021 (msgflg & MSG_NOERROR) == 0) { 1022 DPRINTF(("first message on the queue " 1023 "is too big (want %zu, got %d)\n", 1024 msgsz, msghdr->msg_ts)); 1025 error = E2BIG; 1026 goto done2; 1027 } 1028 #ifdef MAC 1029 error = mac_sysvmsq_check_msgrcv(td->td_ucred, 1030 msghdr); 1031 if (error != 0) 1032 goto done2; 1033 #endif 1034 if (msqkptr->u.msg_first == msqkptr->u.msg_last) { 1035 msqkptr->u.msg_first = NULL; 1036 msqkptr->u.msg_last = NULL; 1037 } else { 1038 msqkptr->u.msg_first = msghdr->msg_next; 1039 if (msqkptr->u.msg_first == NULL) 1040 panic("msg_first/last screwed up #1"); 1041 } 1042 } 1043 } else { 1044 struct msg *previous; 1045 struct msg **prev; 1046 1047 previous = NULL; 1048 prev = &(msqkptr->u.msg_first); 1049 while ((msghdr = *prev) != NULL) { 1050 /* 1051 * Is this message's type an exact match or is 1052 * this message's type less than or equal to 1053 * the absolute value of a negative msgtyp? 1054 * Note that the second half of this test can 1055 * NEVER be true if msgtyp is positive since 1056 * msg_type is always positive! 1057 */ 1058 1059 if (msgtyp == msghdr->msg_type || 1060 msghdr->msg_type <= -msgtyp) { 1061 DPRINTF(("found message type %ld, " 1062 "requested %ld\n", 1063 msghdr->msg_type, msgtyp)); 1064 if (msgsz < msghdr->msg_ts && 1065 (msgflg & MSG_NOERROR) == 0) { 1066 DPRINTF(("requested message " 1067 "on the queue is too big " 1068 "(want %zu, got %hu)\n", 1069 msgsz, msghdr->msg_ts)); 1070 error = E2BIG; 1071 goto done2; 1072 } 1073 #ifdef MAC 1074 error = mac_sysvmsq_check_msgrcv( 1075 td->td_ucred, msghdr); 1076 if (error != 0) 1077 goto done2; 1078 #endif 1079 *prev = msghdr->msg_next; 1080 if (msghdr == msqkptr->u.msg_last) { 1081 if (previous == NULL) { 1082 if (prev != 1083 &msqkptr->u.msg_first) 1084 panic("msg_first/last screwed up #2"); 1085 msqkptr->u.msg_first = 1086 NULL; 1087 msqkptr->u.msg_last = 1088 NULL; 1089 } else { 1090 if (prev == 1091 &msqkptr->u.msg_first) 1092 panic("msg_first/last screwed up #3"); 1093 msqkptr->u.msg_last = 1094 previous; 1095 } 1096 } 1097 break; 1098 } 1099 previous = msghdr; 1100 prev = &(msghdr->msg_next); 1101 } 1102 } 1103 1104 /* 1105 * We've either extracted the msghdr for the appropriate 1106 * message or there isn't one. 1107 * If there is one then bail out of this loop. 1108 */ 1109 1110 if (msghdr != NULL) 1111 break; 1112 1113 /* 1114 * Hmph! No message found. Does the user want to wait? 1115 */ 1116 1117 if ((msgflg & IPC_NOWAIT) != 0) { 1118 DPRINTF(("no appropriate message found (msgtyp=%ld)\n", 1119 msgtyp)); 1120 /* The SVID says to return ENOMSG. */ 1121 error = ENOMSG; 1122 goto done2; 1123 } 1124 1125 /* 1126 * Wait for something to happen 1127 */ 1128 1129 DPRINTF(("msgrcv: goodnight\n")); 1130 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH, 1131 "msgrcv", 0); 1132 DPRINTF(("msgrcv: good morning (error=%d)\n", error)); 1133 1134 if (error != 0) { 1135 DPRINTF(("msgrcv: interrupted system call\n")); 1136 error = EINTR; 1137 goto done2; 1138 } 1139 1140 /* 1141 * Make sure that the msq queue still exists 1142 */ 1143 1144 if (msqkptr->u.msg_qbytes == 0 || 1145 msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 1146 DPRINTF(("msqid deleted\n")); 1147 error = EIDRM; 1148 goto done2; 1149 } 1150 } 1151 1152 /* 1153 * Return the message to the user. 1154 * 1155 * First, do the bookkeeping (before we risk being interrupted). 1156 */ 1157 1158 msqkptr->u.msg_cbytes -= msghdr->msg_ts; 1159 msqkptr->u.msg_qnum--; 1160 msqkptr->u.msg_lrpid = td->td_proc->p_pid; 1161 msqkptr->u.msg_rtime = time_second; 1162 1163 /* 1164 * Make msgsz the actual amount that we'll be returning. 1165 * Note that this effectively truncates the message if it is too long 1166 * (since msgsz is never increased). 1167 */ 1168 1169 DPRINTF(("found a message, msgsz=%zu, msg_ts=%hu\n", msgsz, 1170 msghdr->msg_ts)); 1171 if (msgsz > msghdr->msg_ts) 1172 msgsz = msghdr->msg_ts; 1173 *mtype = msghdr->msg_type; 1174 1175 /* 1176 * Return the segments to the user 1177 */ 1178 1179 next = msghdr->msg_spot; 1180 for (len = 0; len < msgsz; len += msginfo.msgssz) { 1181 size_t tlen; 1182 1183 if (msgsz - len > msginfo.msgssz) 1184 tlen = msginfo.msgssz; 1185 else 1186 tlen = msgsz - len; 1187 if (next <= -1) 1188 panic("next too low #3"); 1189 if (next >= msginfo.msgseg) 1190 panic("next out of range #3"); 1191 mtx_unlock(&msq_mtx); 1192 error = copyout(&msgpool[next * msginfo.msgssz], msgp, tlen); 1193 mtx_lock(&msq_mtx); 1194 if (error != 0) { 1195 DPRINTF(("error (%d) copying out message segment\n", 1196 error)); 1197 msg_freehdr(msghdr); 1198 wakeup(msqkptr); 1199 goto done2; 1200 } 1201 msgp = (char *)msgp + tlen; 1202 next = msgmaps[next].next; 1203 } 1204 1205 /* 1206 * Done, return the actual number of bytes copied out. 1207 */ 1208 1209 msg_freehdr(msghdr); 1210 wakeup(msqkptr); 1211 td->td_retval[0] = msgsz; 1212 done2: 1213 mtx_unlock(&msq_mtx); 1214 return (error); 1215 } 1216 1217 int 1218 msgrcv(td, uap) 1219 struct thread *td; 1220 register struct msgrcv_args *uap; 1221 { 1222 int error; 1223 long mtype; 1224 1225 DPRINTF(("call to msgrcv(%d, %p, %zu, %ld, %d)\n", uap->msqid, 1226 uap->msgp, uap->msgsz, uap->msgtyp, uap->msgflg)); 1227 1228 if ((error = kern_msgrcv(td, uap->msqid, 1229 (char *)uap->msgp + sizeof(mtype), uap->msgsz, 1230 uap->msgtyp, uap->msgflg, &mtype)) != 0) 1231 return (error); 1232 if ((error = copyout(&mtype, uap->msgp, sizeof(mtype))) != 0) 1233 DPRINTF(("error %d copying the message type\n", error)); 1234 return (error); 1235 } 1236 1237 static int 1238 sysctl_msqids(SYSCTL_HANDLER_ARGS) 1239 { 1240 1241 return (SYSCTL_OUT(req, msqids, 1242 sizeof(struct msqid_kernel) * msginfo.msgmni)); 1243 } 1244 1245 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmax, CTLFLAG_RD, &msginfo.msgmax, 0, 1246 "Maximum message size"); 1247 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmni, CTLFLAG_RDTUN, &msginfo.msgmni, 0, 1248 "Number of message queue identifiers"); 1249 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmnb, CTLFLAG_RDTUN, &msginfo.msgmnb, 0, 1250 "Maximum number of bytes in a queue"); 1251 SYSCTL_INT(_kern_ipc, OID_AUTO, msgtql, CTLFLAG_RDTUN, &msginfo.msgtql, 0, 1252 "Maximum number of messages in the system"); 1253 SYSCTL_INT(_kern_ipc, OID_AUTO, msgssz, CTLFLAG_RDTUN, &msginfo.msgssz, 0, 1254 "Size of a message segment"); 1255 SYSCTL_INT(_kern_ipc, OID_AUTO, msgseg, CTLFLAG_RDTUN, &msginfo.msgseg, 0, 1256 "Number of message segments"); 1257 SYSCTL_PROC(_kern_ipc, OID_AUTO, msqids, CTLFLAG_RD, 1258 NULL, 0, sysctl_msqids, "", "Message queue IDs"); 1259 1260 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1261 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1262 SYSCALL_MODULE_HELPER(msgsys); 1263 SYSCALL_MODULE_HELPER(freebsd7_msgctl); 1264 1265 /* XXX casting to (sy_call_t *) is bogus, as usual. */ 1266 static sy_call_t *msgcalls[] = { 1267 (sy_call_t *)freebsd7_msgctl, (sy_call_t *)msgget, 1268 (sy_call_t *)msgsnd, (sy_call_t *)msgrcv 1269 }; 1270 1271 /* 1272 * Entry point for all MSG calls. 1273 */ 1274 int 1275 msgsys(td, uap) 1276 struct thread *td; 1277 /* XXX actually varargs. */ 1278 struct msgsys_args /* { 1279 int which; 1280 int a2; 1281 int a3; 1282 int a4; 1283 int a5; 1284 int a6; 1285 } */ *uap; 1286 { 1287 int error; 1288 1289 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 1290 return (ENOSYS); 1291 if (uap->which < 0 || 1292 uap->which >= sizeof(msgcalls)/sizeof(msgcalls[0])) 1293 return (EINVAL); 1294 error = (*msgcalls[uap->which])(td, &uap->a2); 1295 return (error); 1296 } 1297 1298 #define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0) 1299 1300 #ifndef _SYS_SYSPROTO_H_ 1301 struct freebsd7_msgctl_args { 1302 int msqid; 1303 int cmd; 1304 struct msqid_ds_old *buf; 1305 }; 1306 #endif 1307 int 1308 freebsd7_msgctl(td, uap) 1309 struct thread *td; 1310 struct freebsd7_msgctl_args *uap; 1311 { 1312 struct msqid_ds_old msqold; 1313 struct msqid_ds msqbuf; 1314 int error; 1315 1316 DPRINTF(("call to freebsd7_msgctl(%d, %d, %p)\n", uap->msqid, uap->cmd, 1317 uap->buf)); 1318 if (uap->cmd == IPC_SET) { 1319 error = copyin(uap->buf, &msqold, sizeof(msqold)); 1320 if (error) 1321 return (error); 1322 ipcperm_old2new(&msqold.msg_perm, &msqbuf.msg_perm); 1323 CP(msqold, msqbuf, msg_first); 1324 CP(msqold, msqbuf, msg_last); 1325 CP(msqold, msqbuf, msg_cbytes); 1326 CP(msqold, msqbuf, msg_qnum); 1327 CP(msqold, msqbuf, msg_qbytes); 1328 CP(msqold, msqbuf, msg_lspid); 1329 CP(msqold, msqbuf, msg_lrpid); 1330 CP(msqold, msqbuf, msg_stime); 1331 CP(msqold, msqbuf, msg_rtime); 1332 CP(msqold, msqbuf, msg_ctime); 1333 } 1334 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1335 if (error) 1336 return (error); 1337 if (uap->cmd == IPC_STAT) { 1338 bzero(&msqold, sizeof(msqold)); 1339 ipcperm_new2old(&msqbuf.msg_perm, &msqold.msg_perm); 1340 CP(msqbuf, msqold, msg_first); 1341 CP(msqbuf, msqold, msg_last); 1342 CP(msqbuf, msqold, msg_cbytes); 1343 CP(msqbuf, msqold, msg_qnum); 1344 CP(msqbuf, msqold, msg_qbytes); 1345 CP(msqbuf, msqold, msg_lspid); 1346 CP(msqbuf, msqold, msg_lrpid); 1347 CP(msqbuf, msqold, msg_stime); 1348 CP(msqbuf, msqold, msg_rtime); 1349 CP(msqbuf, msqold, msg_ctime); 1350 error = copyout(&msqold, uap->buf, sizeof(struct msqid_ds_old)); 1351 } 1352 return (error); 1353 } 1354 1355 #undef CP 1356 1357 #endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 || 1358 COMPAT_FREEBSD7 */ 1359