Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/kern/sysv_msg.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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(void) 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(void) 318 { 319 struct msqid_kernel *msqkptr; 320 int msqid; 321 #ifdef MAC 322 int i; 323 #endif 324 325 syscall_helper_unregister(msg_syscalls); 326 #ifdef COMPAT_FREEBSD32 327 syscall32_helper_unregister(msg32_syscalls); 328 #endif 329 330 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 331 msqkptr = &msqids[msqid]; 332 if (msqkptr->u.msg_qbytes != 0 || 333 (msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) 334 break; 335 } 336 if (msqid != msginfo.msgmni) 337 return (EBUSY); 338 339 if (msg_prison_slot != 0) 340 osd_jail_deregister(msg_prison_slot); 341 #ifdef MAC 342 for (i = 0; i < msginfo.msgtql; i++) 343 mac_sysvmsg_destroy(&msghdrs[i]); 344 for (msqid = 0; msqid < msginfo.msgmni; msqid++) 345 mac_sysvmsq_destroy(&msqids[msqid]); 346 #endif 347 free(msgpool, M_MSG); 348 free(msgmaps, M_MSG); 349 free(msghdrs, M_MSG); 350 free(msqids, M_MSG); 351 mtx_destroy(&msq_mtx); 352 return (0); 353 } 354 355 356 static int 357 sysvmsg_modload(struct module *module, int cmd, void *arg) 358 { 359 int error = 0; 360 361 switch (cmd) { 362 case MOD_LOAD: 363 error = msginit(); 364 if (error != 0) 365 msgunload(); 366 break; 367 case MOD_UNLOAD: 368 error = msgunload(); 369 break; 370 case MOD_SHUTDOWN: 371 break; 372 default: 373 error = EINVAL; 374 break; 375 } 376 return (error); 377 } 378 379 static moduledata_t sysvmsg_mod = { 380 "sysvmsg", 381 &sysvmsg_modload, 382 NULL 383 }; 384 385 DECLARE_MODULE(sysvmsg, sysvmsg_mod, SI_SUB_SYSV_MSG, SI_ORDER_FIRST); 386 MODULE_VERSION(sysvmsg, 1); 387 388 static void 389 msg_freehdr(struct msg *msghdr) 390 { 391 while (msghdr->msg_ts > 0) { 392 short next; 393 if (msghdr->msg_spot < 0 || msghdr->msg_spot >= msginfo.msgseg) 394 panic("msghdr->msg_spot out of range"); 395 next = msgmaps[msghdr->msg_spot].next; 396 msgmaps[msghdr->msg_spot].next = free_msgmaps; 397 free_msgmaps = msghdr->msg_spot; 398 nfree_msgmaps++; 399 msghdr->msg_spot = next; 400 if (msghdr->msg_ts >= msginfo.msgssz) 401 msghdr->msg_ts -= msginfo.msgssz; 402 else 403 msghdr->msg_ts = 0; 404 } 405 if (msghdr->msg_spot != -1) 406 panic("msghdr->msg_spot != -1"); 407 msghdr->msg_next = free_msghdrs; 408 free_msghdrs = msghdr; 409 #ifdef MAC 410 mac_sysvmsg_cleanup(msghdr); 411 #endif 412 } 413 414 static void 415 msq_remove(struct msqid_kernel *msqkptr) 416 { 417 struct msg *msghdr; 418 419 racct_sub_cred(msqkptr->cred, RACCT_NMSGQ, 1); 420 racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, msqkptr->u.msg_qnum); 421 racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msqkptr->u.msg_cbytes); 422 crfree(msqkptr->cred); 423 msqkptr->cred = NULL; 424 425 /* Free the message headers */ 426 msghdr = msqkptr->u.__msg_first; 427 while (msghdr != NULL) { 428 struct msg *msghdr_tmp; 429 430 /* Free the segments of each message */ 431 msqkptr->u.msg_cbytes -= msghdr->msg_ts; 432 msqkptr->u.msg_qnum--; 433 msghdr_tmp = msghdr; 434 msghdr = msghdr->msg_next; 435 msg_freehdr(msghdr_tmp); 436 } 437 438 if (msqkptr->u.msg_cbytes != 0) 439 panic("msg_cbytes is screwed up"); 440 if (msqkptr->u.msg_qnum != 0) 441 panic("msg_qnum is screwed up"); 442 443 msqkptr->u.msg_qbytes = 0; /* Mark it as free */ 444 445 #ifdef MAC 446 mac_sysvmsq_cleanup(msqkptr); 447 #endif 448 449 wakeup(msqkptr); 450 } 451 452 static struct prison * 453 msg_find_prison(struct ucred *cred) 454 { 455 struct prison *pr, *rpr; 456 457 pr = cred->cr_prison; 458 prison_lock(pr); 459 rpr = osd_jail_get(pr, msg_prison_slot); 460 prison_unlock(pr); 461 return rpr; 462 } 463 464 static int 465 msq_prison_cansee(struct prison *rpr, struct msqid_kernel *msqkptr) 466 { 467 468 if (msqkptr->cred == NULL || 469 !(rpr == msqkptr->cred->cr_prison || 470 prison_ischild(rpr, msqkptr->cred->cr_prison))) 471 return (EINVAL); 472 return (0); 473 } 474 475 #ifndef _SYS_SYSPROTO_H_ 476 struct msgctl_args { 477 int msqid; 478 int cmd; 479 struct msqid_ds *buf; 480 }; 481 #endif 482 int 483 sys_msgctl(struct thread *td, struct msgctl_args *uap) 484 { 485 int msqid = uap->msqid; 486 int cmd = uap->cmd; 487 struct msqid_ds msqbuf; 488 int error; 489 490 DPRINTF(("call to msgctl(%d, %d, %p)\n", msqid, cmd, uap->buf)); 491 if (cmd == IPC_SET && 492 (error = copyin(uap->buf, &msqbuf, sizeof(msqbuf))) != 0) 493 return (error); 494 error = kern_msgctl(td, msqid, cmd, &msqbuf); 495 if (cmd == IPC_STAT && error == 0) 496 error = copyout(&msqbuf, uap->buf, sizeof(struct msqid_ds)); 497 return (error); 498 } 499 500 int 501 kern_msgctl(struct thread *td, int msqid, int cmd, struct msqid_ds *msqbuf) 502 { 503 int rval, error, msqix; 504 struct msqid_kernel *msqkptr; 505 struct prison *rpr; 506 507 rpr = msg_find_prison(td->td_ucred); 508 if (rpr == NULL) 509 return (ENOSYS); 510 511 AUDIT_ARG_SVIPC_CMD(cmd); 512 AUDIT_ARG_SVIPC_ID(msqid); 513 msqix = IPCID_TO_IX(msqid); 514 515 if (msqix < 0 || msqix >= msginfo.msgmni) { 516 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 517 msginfo.msgmni)); 518 return (EINVAL); 519 } 520 521 msqkptr = &msqids[msqix]; 522 523 mtx_lock(&msq_mtx); 524 if (msqkptr->u.msg_qbytes == 0) { 525 DPRINTF(("no such msqid\n")); 526 error = EINVAL; 527 goto done2; 528 } 529 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 530 DPRINTF(("wrong sequence number\n")); 531 error = EINVAL; 532 goto done2; 533 } 534 535 error = msq_prison_cansee(rpr, msqkptr); 536 if (error != 0) { 537 DPRINTF(("requester can't see prison\n")); 538 goto done2; 539 } 540 541 #ifdef MAC 542 error = mac_sysvmsq_check_msqctl(td->td_ucred, msqkptr, cmd); 543 if (error != 0) 544 goto done2; 545 #endif 546 547 error = 0; 548 rval = 0; 549 550 switch (cmd) { 551 552 case IPC_RMID: 553 { 554 #ifdef MAC 555 struct msg *msghdr; 556 #endif 557 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M))) 558 goto done2; 559 560 #ifdef MAC 561 /* 562 * Check that the thread has MAC access permissions to 563 * individual msghdrs. Note: We need to do this in a 564 * separate loop because the actual loop alters the 565 * msq/msghdr info as it progresses, and there is no going 566 * back if half the way through we discover that the 567 * thread cannot free a certain msghdr. The msq will get 568 * into an inconsistent state. 569 */ 570 for (msghdr = msqkptr->u.__msg_first; msghdr != NULL; 571 msghdr = msghdr->msg_next) { 572 error = mac_sysvmsq_check_msgrmid(td->td_ucred, msghdr); 573 if (error != 0) 574 goto done2; 575 } 576 #endif 577 578 msq_remove(msqkptr); 579 } 580 581 break; 582 583 case IPC_SET: 584 AUDIT_ARG_SVIPC_PERM(&msqbuf->msg_perm); 585 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M))) 586 goto done2; 587 if (msqbuf->msg_qbytes > msqkptr->u.msg_qbytes) { 588 error = priv_check(td, PRIV_IPC_MSGSIZE); 589 if (error) 590 goto done2; 591 } 592 if (msqbuf->msg_qbytes > msginfo.msgmnb) { 593 DPRINTF(("can't increase msg_qbytes beyond %d" 594 "(truncating)\n", msginfo.msgmnb)); 595 msqbuf->msg_qbytes = msginfo.msgmnb; /* silently restrict qbytes to system limit */ 596 } 597 if (msqbuf->msg_qbytes == 0) { 598 DPRINTF(("can't reduce msg_qbytes to 0\n")); 599 error = EINVAL; /* non-standard errno! */ 600 goto done2; 601 } 602 msqkptr->u.msg_perm.uid = msqbuf->msg_perm.uid; /* change the owner */ 603 msqkptr->u.msg_perm.gid = msqbuf->msg_perm.gid; /* change the owner */ 604 msqkptr->u.msg_perm.mode = (msqkptr->u.msg_perm.mode & ~0777) | 605 (msqbuf->msg_perm.mode & 0777); 606 msqkptr->u.msg_qbytes = msqbuf->msg_qbytes; 607 msqkptr->u.msg_ctime = time_second; 608 break; 609 610 case IPC_STAT: 611 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) { 612 DPRINTF(("requester doesn't have read access\n")); 613 goto done2; 614 } 615 *msqbuf = msqkptr->u; 616 if (td->td_ucred->cr_prison != msqkptr->cred->cr_prison) 617 msqbuf->msg_perm.key = IPC_PRIVATE; 618 619 /* 620 * Try to hide the fact that the structure layout is shared by 621 * both the kernel and userland. These pointers are not useful 622 * to userspace. 623 */ 624 msqbuf->__msg_first = msqbuf->__msg_last = NULL; 625 break; 626 627 default: 628 DPRINTF(("invalid command %d\n", cmd)); 629 error = EINVAL; 630 goto done2; 631 } 632 633 if (error == 0) 634 td->td_retval[0] = rval; 635 done2: 636 mtx_unlock(&msq_mtx); 637 return (error); 638 } 639 640 #ifndef _SYS_SYSPROTO_H_ 641 struct msgget_args { 642 key_t key; 643 int msgflg; 644 }; 645 #endif 646 647 int 648 sys_msgget(struct thread *td, struct msgget_args *uap) 649 { 650 int msqid, error = 0; 651 int key = uap->key; 652 int msgflg = uap->msgflg; 653 struct ucred *cred = td->td_ucred; 654 struct msqid_kernel *msqkptr = NULL; 655 656 DPRINTF(("msgget(0x%x, 0%o)\n", key, msgflg)); 657 658 if (msg_find_prison(cred) == NULL) 659 return (ENOSYS); 660 661 mtx_lock(&msq_mtx); 662 if (key != IPC_PRIVATE) { 663 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 664 msqkptr = &msqids[msqid]; 665 if (msqkptr->u.msg_qbytes != 0 && 666 msqkptr->cred != NULL && 667 msqkptr->cred->cr_prison == cred->cr_prison && 668 msqkptr->u.msg_perm.key == key) 669 break; 670 } 671 if (msqid < msginfo.msgmni) { 672 DPRINTF(("found public key\n")); 673 if ((msgflg & IPC_CREAT) && (msgflg & IPC_EXCL)) { 674 DPRINTF(("not exclusive\n")); 675 error = EEXIST; 676 goto done2; 677 } 678 AUDIT_ARG_SVIPC_ID(IXSEQ_TO_IPCID(msqid, 679 msqkptr->u.msg_perm)); 680 if ((error = ipcperm(td, &msqkptr->u.msg_perm, 681 msgflg & 0700))) { 682 DPRINTF(("requester doesn't have 0%o access\n", 683 msgflg & 0700)); 684 goto done2; 685 } 686 #ifdef MAC 687 error = mac_sysvmsq_check_msqget(cred, msqkptr); 688 if (error != 0) 689 goto done2; 690 #endif 691 goto found; 692 } 693 } 694 695 DPRINTF(("need to allocate the msqid_ds\n")); 696 if (key == IPC_PRIVATE || (msgflg & IPC_CREAT)) { 697 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 698 /* 699 * Look for an unallocated and unlocked msqid_ds. 700 * msqid_ds's can be locked by msgsnd or msgrcv while 701 * they are copying the message in/out. We can't 702 * re-use the entry until they release it. 703 */ 704 msqkptr = &msqids[msqid]; 705 if (msqkptr->u.msg_qbytes == 0 && 706 (msqkptr->u.msg_perm.mode & MSG_LOCKED) == 0) 707 break; 708 } 709 if (msqid == msginfo.msgmni) { 710 DPRINTF(("no more msqid_ds's available\n")); 711 error = ENOSPC; 712 goto done2; 713 } 714 #ifdef RACCT 715 if (racct_enable) { 716 PROC_LOCK(td->td_proc); 717 error = racct_add(td->td_proc, RACCT_NMSGQ, 1); 718 PROC_UNLOCK(td->td_proc); 719 if (error != 0) { 720 error = ENOSPC; 721 goto done2; 722 } 723 } 724 #endif 725 DPRINTF(("msqid %d is available\n", msqid)); 726 msqkptr->u.msg_perm.key = key; 727 msqkptr->u.msg_perm.cuid = cred->cr_uid; 728 msqkptr->u.msg_perm.uid = cred->cr_uid; 729 msqkptr->u.msg_perm.cgid = cred->cr_gid; 730 msqkptr->u.msg_perm.gid = cred->cr_gid; 731 msqkptr->u.msg_perm.mode = (msgflg & 0777); 732 msqkptr->cred = crhold(cred); 733 /* Make sure that the returned msqid is unique */ 734 msqkptr->u.msg_perm.seq = (msqkptr->u.msg_perm.seq + 1) & 0x7fff; 735 msqkptr->u.__msg_first = NULL; 736 msqkptr->u.__msg_last = NULL; 737 msqkptr->u.msg_cbytes = 0; 738 msqkptr->u.msg_qnum = 0; 739 msqkptr->u.msg_qbytes = msginfo.msgmnb; 740 msqkptr->u.msg_lspid = 0; 741 msqkptr->u.msg_lrpid = 0; 742 msqkptr->u.msg_stime = 0; 743 msqkptr->u.msg_rtime = 0; 744 msqkptr->u.msg_ctime = time_second; 745 #ifdef MAC 746 mac_sysvmsq_create(cred, msqkptr); 747 #endif 748 AUDIT_ARG_SVIPC_PERM(&msqkptr->u.msg_perm); 749 } else { 750 DPRINTF(("didn't find it and wasn't asked to create it\n")); 751 error = ENOENT; 752 goto done2; 753 } 754 755 found: 756 /* Construct the unique msqid */ 757 td->td_retval[0] = IXSEQ_TO_IPCID(msqid, msqkptr->u.msg_perm); 758 done2: 759 mtx_unlock(&msq_mtx); 760 return (error); 761 } 762 763 #ifndef _SYS_SYSPROTO_H_ 764 struct msgsnd_args { 765 int msqid; 766 const void *msgp; /* XXX msgp is actually mtext. */ 767 size_t msgsz; 768 int msgflg; 769 }; 770 #endif 771 int 772 kern_msgsnd(struct thread *td, int msqid, const void *msgp, 773 size_t msgsz, int msgflg, long mtype) 774 { 775 int msqix, segs_needed, error = 0; 776 struct msqid_kernel *msqkptr; 777 struct msg *msghdr; 778 struct prison *rpr; 779 short next; 780 #ifdef RACCT 781 size_t saved_msgsz = 0; 782 #endif 783 784 rpr = msg_find_prison(td->td_ucred); 785 if (rpr == NULL) 786 return (ENOSYS); 787 788 mtx_lock(&msq_mtx); 789 AUDIT_ARG_SVIPC_ID(msqid); 790 msqix = IPCID_TO_IX(msqid); 791 792 if (msqix < 0 || msqix >= msginfo.msgmni) { 793 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 794 msginfo.msgmni)); 795 error = EINVAL; 796 goto done2; 797 } 798 799 msqkptr = &msqids[msqix]; 800 AUDIT_ARG_SVIPC_PERM(&msqkptr->u.msg_perm); 801 if (msqkptr->u.msg_qbytes == 0) { 802 DPRINTF(("no such message queue id\n")); 803 error = EINVAL; 804 goto done2; 805 } 806 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 807 DPRINTF(("wrong sequence number\n")); 808 error = EINVAL; 809 goto done2; 810 } 811 812 if ((error = msq_prison_cansee(rpr, msqkptr))) { 813 DPRINTF(("requester can't see prison\n")); 814 goto done2; 815 } 816 817 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_W))) { 818 DPRINTF(("requester doesn't have write access\n")); 819 goto done2; 820 } 821 822 #ifdef MAC 823 error = mac_sysvmsq_check_msqsnd(td->td_ucred, msqkptr); 824 if (error != 0) 825 goto done2; 826 #endif 827 828 #ifdef RACCT 829 if (racct_enable) { 830 PROC_LOCK(td->td_proc); 831 if (racct_add(td->td_proc, RACCT_MSGQQUEUED, 1)) { 832 PROC_UNLOCK(td->td_proc); 833 error = EAGAIN; 834 goto done2; 835 } 836 saved_msgsz = msgsz; 837 if (racct_add(td->td_proc, RACCT_MSGQSIZE, msgsz)) { 838 racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1); 839 PROC_UNLOCK(td->td_proc); 840 error = EAGAIN; 841 goto done2; 842 } 843 PROC_UNLOCK(td->td_proc); 844 } 845 #endif 846 847 segs_needed = howmany(msgsz, msginfo.msgssz); 848 DPRINTF(("msgsz=%zu, msgssz=%d, segs_needed=%d\n", msgsz, 849 msginfo.msgssz, segs_needed)); 850 for (;;) { 851 int need_more_resources = 0; 852 853 /* 854 * check msgsz 855 * (inside this loop in case msg_qbytes changes while we sleep) 856 */ 857 858 if (msgsz > msqkptr->u.msg_qbytes) { 859 DPRINTF(("msgsz > msqkptr->u.msg_qbytes\n")); 860 error = EINVAL; 861 goto done3; 862 } 863 864 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) { 865 DPRINTF(("msqid is locked\n")); 866 need_more_resources = 1; 867 } 868 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) { 869 DPRINTF(("msgsz + msg_cbytes > msg_qbytes\n")); 870 need_more_resources = 1; 871 } 872 if (segs_needed > nfree_msgmaps) { 873 DPRINTF(("segs_needed > nfree_msgmaps\n")); 874 need_more_resources = 1; 875 } 876 if (free_msghdrs == NULL) { 877 DPRINTF(("no more msghdrs\n")); 878 need_more_resources = 1; 879 } 880 881 if (need_more_resources) { 882 int we_own_it; 883 884 if ((msgflg & IPC_NOWAIT) != 0) { 885 DPRINTF(("need more resources but caller " 886 "doesn't want to wait\n")); 887 error = EAGAIN; 888 goto done3; 889 } 890 891 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) { 892 DPRINTF(("we don't own the msqid_ds\n")); 893 we_own_it = 0; 894 } else { 895 /* Force later arrivals to wait for our 896 request */ 897 DPRINTF(("we own the msqid_ds\n")); 898 msqkptr->u.msg_perm.mode |= MSG_LOCKED; 899 we_own_it = 1; 900 } 901 DPRINTF(("msgsnd: goodnight\n")); 902 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH, 903 "msgsnd", hz); 904 DPRINTF(("msgsnd: good morning, error=%d\n", error)); 905 if (we_own_it) 906 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 907 if (error == EWOULDBLOCK) { 908 DPRINTF(("msgsnd: timed out\n")); 909 continue; 910 } 911 if (error != 0) { 912 DPRINTF(("msgsnd: interrupted system call\n")); 913 error = EINTR; 914 goto done3; 915 } 916 917 /* 918 * Make sure that the msq queue still exists 919 */ 920 921 if (msqkptr->u.msg_qbytes == 0) { 922 DPRINTF(("msqid deleted\n")); 923 error = EIDRM; 924 goto done3; 925 } 926 927 } else { 928 DPRINTF(("got all the resources that we need\n")); 929 break; 930 } 931 } 932 933 /* 934 * We have the resources that we need. 935 * Make sure! 936 */ 937 938 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) 939 panic("msg_perm.mode & MSG_LOCKED"); 940 if (segs_needed > nfree_msgmaps) 941 panic("segs_needed > nfree_msgmaps"); 942 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) 943 panic("msgsz + msg_cbytes > msg_qbytes"); 944 if (free_msghdrs == NULL) 945 panic("no more msghdrs"); 946 947 /* 948 * Re-lock the msqid_ds in case we page-fault when copying in the 949 * message 950 */ 951 952 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) 953 panic("msqid_ds is already locked"); 954 msqkptr->u.msg_perm.mode |= MSG_LOCKED; 955 956 /* 957 * Allocate a message header 958 */ 959 960 msghdr = free_msghdrs; 961 free_msghdrs = msghdr->msg_next; 962 msghdr->msg_spot = -1; 963 msghdr->msg_ts = msgsz; 964 msghdr->msg_type = mtype; 965 #ifdef MAC 966 /* 967 * XXXMAC: Should the mac_sysvmsq_check_msgmsq check follow here 968 * immediately? Or, should it be checked just before the msg is 969 * enqueued in the msgq (as it is done now)? 970 */ 971 mac_sysvmsg_create(td->td_ucred, msqkptr, msghdr); 972 #endif 973 974 /* 975 * Allocate space for the message 976 */ 977 978 while (segs_needed > 0) { 979 if (nfree_msgmaps <= 0) 980 panic("not enough msgmaps"); 981 if (free_msgmaps == -1) 982 panic("nil free_msgmaps"); 983 next = free_msgmaps; 984 if (next <= -1) 985 panic("next too low #1"); 986 if (next >= msginfo.msgseg) 987 panic("next out of range #1"); 988 DPRINTF(("allocating segment %d to message\n", next)); 989 free_msgmaps = msgmaps[next].next; 990 nfree_msgmaps--; 991 msgmaps[next].next = msghdr->msg_spot; 992 msghdr->msg_spot = next; 993 segs_needed--; 994 } 995 996 /* 997 * Validate the message type 998 */ 999 1000 if (msghdr->msg_type < 1) { 1001 msg_freehdr(msghdr); 1002 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 1003 wakeup(msqkptr); 1004 DPRINTF(("mtype (%ld) < 1\n", msghdr->msg_type)); 1005 error = EINVAL; 1006 goto done3; 1007 } 1008 1009 /* 1010 * Copy in the message body 1011 */ 1012 1013 next = msghdr->msg_spot; 1014 while (msgsz > 0) { 1015 size_t tlen; 1016 if (msgsz > msginfo.msgssz) 1017 tlen = msginfo.msgssz; 1018 else 1019 tlen = msgsz; 1020 if (next <= -1) 1021 panic("next too low #2"); 1022 if (next >= msginfo.msgseg) 1023 panic("next out of range #2"); 1024 mtx_unlock(&msq_mtx); 1025 if ((error = copyin(msgp, &msgpool[next * msginfo.msgssz], 1026 tlen)) != 0) { 1027 mtx_lock(&msq_mtx); 1028 DPRINTF(("error %d copying in message segment\n", 1029 error)); 1030 msg_freehdr(msghdr); 1031 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 1032 wakeup(msqkptr); 1033 goto done3; 1034 } 1035 mtx_lock(&msq_mtx); 1036 msgsz -= tlen; 1037 msgp = (const char *)msgp + tlen; 1038 next = msgmaps[next].next; 1039 } 1040 if (next != -1) 1041 panic("didn't use all the msg segments"); 1042 1043 /* 1044 * We've got the message. Unlock the msqid_ds. 1045 */ 1046 1047 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 1048 1049 /* 1050 * Make sure that the msqid_ds is still allocated. 1051 */ 1052 1053 if (msqkptr->u.msg_qbytes == 0) { 1054 msg_freehdr(msghdr); 1055 wakeup(msqkptr); 1056 error = EIDRM; 1057 goto done3; 1058 } 1059 1060 #ifdef MAC 1061 /* 1062 * Note: Since the task/thread allocates the msghdr and usually 1063 * primes it with its own MAC label, for a majority of policies, it 1064 * won't be necessary to check whether the msghdr has access 1065 * permissions to the msgq. The mac_sysvmsq_check_msqsnd check would 1066 * suffice in that case. However, this hook may be required where 1067 * individual policies derive a non-identical label for the msghdr 1068 * from the current thread label and may want to check the msghdr 1069 * enqueue permissions, along with read/write permissions to the 1070 * msgq. 1071 */ 1072 error = mac_sysvmsq_check_msgmsq(td->td_ucred, msghdr, msqkptr); 1073 if (error != 0) { 1074 msg_freehdr(msghdr); 1075 wakeup(msqkptr); 1076 goto done3; 1077 } 1078 #endif 1079 1080 /* 1081 * Put the message into the queue 1082 */ 1083 if (msqkptr->u.__msg_first == NULL) { 1084 msqkptr->u.__msg_first = msghdr; 1085 msqkptr->u.__msg_last = msghdr; 1086 } else { 1087 msqkptr->u.__msg_last->msg_next = msghdr; 1088 msqkptr->u.__msg_last = msghdr; 1089 } 1090 msqkptr->u.__msg_last->msg_next = NULL; 1091 1092 msqkptr->u.msg_cbytes += msghdr->msg_ts; 1093 msqkptr->u.msg_qnum++; 1094 msqkptr->u.msg_lspid = td->td_proc->p_pid; 1095 msqkptr->u.msg_stime = time_second; 1096 1097 wakeup(msqkptr); 1098 td->td_retval[0] = 0; 1099 done3: 1100 #ifdef RACCT 1101 if (racct_enable && error != 0) { 1102 PROC_LOCK(td->td_proc); 1103 racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1); 1104 racct_sub(td->td_proc, RACCT_MSGQSIZE, saved_msgsz); 1105 PROC_UNLOCK(td->td_proc); 1106 } 1107 #endif 1108 done2: 1109 mtx_unlock(&msq_mtx); 1110 return (error); 1111 } 1112 1113 int 1114 sys_msgsnd(struct thread *td, struct msgsnd_args *uap) 1115 { 1116 int error; 1117 long mtype; 1118 1119 DPRINTF(("call to msgsnd(%d, %p, %zu, %d)\n", uap->msqid, uap->msgp, 1120 uap->msgsz, uap->msgflg)); 1121 1122 if ((error = copyin(uap->msgp, &mtype, sizeof(mtype))) != 0) { 1123 DPRINTF(("error %d copying the message type\n", error)); 1124 return (error); 1125 } 1126 return (kern_msgsnd(td, uap->msqid, 1127 (const char *)uap->msgp + sizeof(mtype), 1128 uap->msgsz, uap->msgflg, mtype)); 1129 } 1130 1131 #ifndef _SYS_SYSPROTO_H_ 1132 struct msgrcv_args { 1133 int msqid; 1134 void *msgp; 1135 size_t msgsz; 1136 long msgtyp; 1137 int msgflg; 1138 }; 1139 #endif 1140 /* XXX msgp is actually mtext. */ 1141 int 1142 kern_msgrcv(struct thread *td, int msqid, void *msgp, size_t msgsz, long msgtyp, 1143 int msgflg, long *mtype) 1144 { 1145 size_t len; 1146 struct msqid_kernel *msqkptr; 1147 struct msg *msghdr; 1148 struct prison *rpr; 1149 int msqix, error = 0; 1150 short next; 1151 1152 rpr = msg_find_prison(td->td_ucred); 1153 if (rpr == NULL) 1154 return (ENOSYS); 1155 1156 AUDIT_ARG_SVIPC_ID(msqid); 1157 msqix = IPCID_TO_IX(msqid); 1158 1159 if (msqix < 0 || msqix >= msginfo.msgmni) { 1160 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 1161 msginfo.msgmni)); 1162 return (EINVAL); 1163 } 1164 1165 msqkptr = &msqids[msqix]; 1166 mtx_lock(&msq_mtx); 1167 AUDIT_ARG_SVIPC_PERM(&msqkptr->u.msg_perm); 1168 if (msqkptr->u.msg_qbytes == 0) { 1169 DPRINTF(("no such message queue id\n")); 1170 error = EINVAL; 1171 goto done2; 1172 } 1173 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 1174 DPRINTF(("wrong sequence number\n")); 1175 error = EINVAL; 1176 goto done2; 1177 } 1178 1179 if ((error = msq_prison_cansee(rpr, msqkptr))) { 1180 DPRINTF(("requester can't see prison\n")); 1181 goto done2; 1182 } 1183 1184 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) { 1185 DPRINTF(("requester doesn't have read access\n")); 1186 goto done2; 1187 } 1188 1189 #ifdef MAC 1190 error = mac_sysvmsq_check_msqrcv(td->td_ucred, msqkptr); 1191 if (error != 0) 1192 goto done2; 1193 #endif 1194 1195 msghdr = NULL; 1196 while (msghdr == NULL) { 1197 if (msgtyp == 0) { 1198 msghdr = msqkptr->u.__msg_first; 1199 if (msghdr != NULL) { 1200 if (msgsz < msghdr->msg_ts && 1201 (msgflg & MSG_NOERROR) == 0) { 1202 DPRINTF(("first message on the queue " 1203 "is too big (want %zu, got %d)\n", 1204 msgsz, msghdr->msg_ts)); 1205 error = E2BIG; 1206 goto done2; 1207 } 1208 #ifdef MAC 1209 error = mac_sysvmsq_check_msgrcv(td->td_ucred, 1210 msghdr); 1211 if (error != 0) 1212 goto done2; 1213 #endif 1214 if (msqkptr->u.__msg_first == 1215 msqkptr->u.__msg_last) { 1216 msqkptr->u.__msg_first = NULL; 1217 msqkptr->u.__msg_last = NULL; 1218 } else { 1219 msqkptr->u.__msg_first = msghdr->msg_next; 1220 if (msqkptr->u.__msg_first == NULL) 1221 panic("msg_first/last screwed up #1"); 1222 } 1223 } 1224 } else { 1225 struct msg *previous; 1226 struct msg **prev; 1227 1228 previous = NULL; 1229 prev = &(msqkptr->u.__msg_first); 1230 while ((msghdr = *prev) != NULL) { 1231 /* 1232 * Is this message's type an exact match or is 1233 * this message's type less than or equal to 1234 * the absolute value of a negative msgtyp? 1235 * Note that the second half of this test can 1236 * NEVER be true if msgtyp is positive since 1237 * msg_type is always positive! 1238 */ 1239 1240 if (msgtyp == msghdr->msg_type || 1241 msghdr->msg_type <= -msgtyp) { 1242 DPRINTF(("found message type %ld, " 1243 "requested %ld\n", 1244 msghdr->msg_type, msgtyp)); 1245 if (msgsz < msghdr->msg_ts && 1246 (msgflg & MSG_NOERROR) == 0) { 1247 DPRINTF(("requested message " 1248 "on the queue is too big " 1249 "(want %zu, got %hu)\n", 1250 msgsz, msghdr->msg_ts)); 1251 error = E2BIG; 1252 goto done2; 1253 } 1254 #ifdef MAC 1255 error = mac_sysvmsq_check_msgrcv( 1256 td->td_ucred, msghdr); 1257 if (error != 0) 1258 goto done2; 1259 #endif 1260 *prev = msghdr->msg_next; 1261 if (msghdr == msqkptr->u.__msg_last) { 1262 if (previous == NULL) { 1263 if (prev != 1264 &msqkptr->u.__msg_first) 1265 panic("__msg_first/last screwed up #2"); 1266 msqkptr->u.__msg_first = 1267 NULL; 1268 msqkptr->u.__msg_last = 1269 NULL; 1270 } else { 1271 if (prev == 1272 &msqkptr->u.__msg_first) 1273 panic("__msg_first/last screwed up #3"); 1274 msqkptr->u.__msg_last = 1275 previous; 1276 } 1277 } 1278 break; 1279 } 1280 previous = msghdr; 1281 prev = &(msghdr->msg_next); 1282 } 1283 } 1284 1285 /* 1286 * We've either extracted the msghdr for the appropriate 1287 * message or there isn't one. 1288 * If there is one then bail out of this loop. 1289 */ 1290 1291 if (msghdr != NULL) 1292 break; 1293 1294 /* 1295 * Hmph! No message found. Does the user want to wait? 1296 */ 1297 1298 if ((msgflg & IPC_NOWAIT) != 0) { 1299 DPRINTF(("no appropriate message found (msgtyp=%ld)\n", 1300 msgtyp)); 1301 /* The SVID says to return ENOMSG. */ 1302 error = ENOMSG; 1303 goto done2; 1304 } 1305 1306 /* 1307 * Wait for something to happen 1308 */ 1309 1310 DPRINTF(("msgrcv: goodnight\n")); 1311 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH, 1312 "msgrcv", 0); 1313 DPRINTF(("msgrcv: good morning (error=%d)\n", error)); 1314 1315 if (error != 0) { 1316 DPRINTF(("msgrcv: interrupted system call\n")); 1317 error = EINTR; 1318 goto done2; 1319 } 1320 1321 /* 1322 * Make sure that the msq queue still exists 1323 */ 1324 1325 if (msqkptr->u.msg_qbytes == 0 || 1326 msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 1327 DPRINTF(("msqid deleted\n")); 1328 error = EIDRM; 1329 goto done2; 1330 } 1331 } 1332 1333 /* 1334 * Return the message to the user. 1335 * 1336 * First, do the bookkeeping (before we risk being interrupted). 1337 */ 1338 1339 msqkptr->u.msg_cbytes -= msghdr->msg_ts; 1340 msqkptr->u.msg_qnum--; 1341 msqkptr->u.msg_lrpid = td->td_proc->p_pid; 1342 msqkptr->u.msg_rtime = time_second; 1343 1344 racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, 1); 1345 racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msghdr->msg_ts); 1346 1347 /* 1348 * Make msgsz the actual amount that we'll be returning. 1349 * Note that this effectively truncates the message if it is too long 1350 * (since msgsz is never increased). 1351 */ 1352 1353 DPRINTF(("found a message, msgsz=%zu, msg_ts=%hu\n", msgsz, 1354 msghdr->msg_ts)); 1355 if (msgsz > msghdr->msg_ts) 1356 msgsz = msghdr->msg_ts; 1357 *mtype = msghdr->msg_type; 1358 1359 /* 1360 * Return the segments to the user 1361 */ 1362 1363 next = msghdr->msg_spot; 1364 for (len = 0; len < msgsz; len += msginfo.msgssz) { 1365 size_t tlen; 1366 1367 if (msgsz - len > msginfo.msgssz) 1368 tlen = msginfo.msgssz; 1369 else 1370 tlen = msgsz - len; 1371 if (next <= -1) 1372 panic("next too low #3"); 1373 if (next >= msginfo.msgseg) 1374 panic("next out of range #3"); 1375 mtx_unlock(&msq_mtx); 1376 error = copyout(&msgpool[next * msginfo.msgssz], msgp, tlen); 1377 mtx_lock(&msq_mtx); 1378 if (error != 0) { 1379 DPRINTF(("error (%d) copying out message segment\n", 1380 error)); 1381 msg_freehdr(msghdr); 1382 wakeup(msqkptr); 1383 goto done2; 1384 } 1385 msgp = (char *)msgp + tlen; 1386 next = msgmaps[next].next; 1387 } 1388 1389 /* 1390 * Done, return the actual number of bytes copied out. 1391 */ 1392 1393 msg_freehdr(msghdr); 1394 wakeup(msqkptr); 1395 td->td_retval[0] = msgsz; 1396 done2: 1397 mtx_unlock(&msq_mtx); 1398 return (error); 1399 } 1400 1401 int 1402 sys_msgrcv(struct thread *td, struct msgrcv_args *uap) 1403 { 1404 int error; 1405 long mtype; 1406 1407 DPRINTF(("call to msgrcv(%d, %p, %zu, %ld, %d)\n", uap->msqid, 1408 uap->msgp, uap->msgsz, uap->msgtyp, uap->msgflg)); 1409 1410 if ((error = kern_msgrcv(td, uap->msqid, 1411 (char *)uap->msgp + sizeof(mtype), uap->msgsz, 1412 uap->msgtyp, uap->msgflg, &mtype)) != 0) 1413 return (error); 1414 if ((error = copyout(&mtype, uap->msgp, sizeof(mtype))) != 0) 1415 DPRINTF(("error %d copying the message type\n", error)); 1416 return (error); 1417 } 1418 1419 static int 1420 sysctl_msqids(SYSCTL_HANDLER_ARGS) 1421 { 1422 struct msqid_kernel tmsqk; 1423 #ifdef COMPAT_FREEBSD32 1424 struct msqid_kernel32 tmsqk32; 1425 #endif 1426 struct prison *pr, *rpr; 1427 void *outaddr; 1428 size_t outsize; 1429 int error, i; 1430 1431 pr = req->td->td_ucred->cr_prison; 1432 rpr = msg_find_prison(req->td->td_ucred); 1433 error = 0; 1434 for (i = 0; i < msginfo.msgmni; i++) { 1435 mtx_lock(&msq_mtx); 1436 if (msqids[i].u.msg_qbytes == 0 || rpr == NULL || 1437 msq_prison_cansee(rpr, &msqids[i]) != 0) 1438 bzero(&tmsqk, sizeof(tmsqk)); 1439 else { 1440 tmsqk = msqids[i]; 1441 if (tmsqk.cred->cr_prison != pr) 1442 tmsqk.u.msg_perm.key = IPC_PRIVATE; 1443 } 1444 mtx_unlock(&msq_mtx); 1445 #ifdef COMPAT_FREEBSD32 1446 if (SV_CURPROC_FLAG(SV_ILP32)) { 1447 bzero(&tmsqk32, sizeof(tmsqk32)); 1448 freebsd32_ipcperm_out(&tmsqk.u.msg_perm, 1449 &tmsqk32.u.msg_perm); 1450 /* Don't copy u.msg_first or u.msg_last */ 1451 CP(tmsqk, tmsqk32, u.msg_cbytes); 1452 CP(tmsqk, tmsqk32, u.msg_qnum); 1453 CP(tmsqk, tmsqk32, u.msg_qbytes); 1454 CP(tmsqk, tmsqk32, u.msg_lspid); 1455 CP(tmsqk, tmsqk32, u.msg_lrpid); 1456 CP(tmsqk, tmsqk32, u.msg_stime); 1457 CP(tmsqk, tmsqk32, u.msg_rtime); 1458 CP(tmsqk, tmsqk32, u.msg_ctime); 1459 /* Don't copy label or cred */ 1460 outaddr = &tmsqk32; 1461 outsize = sizeof(tmsqk32); 1462 } else 1463 #endif 1464 { 1465 /* Don't leak kernel pointers */ 1466 tmsqk.u.__msg_first = NULL; 1467 tmsqk.u.__msg_last = NULL; 1468 tmsqk.label = NULL; 1469 tmsqk.cred = NULL; 1470 /* 1471 * XXX: some padding also exists, but we take care to 1472 * allocate our pool of msqid_kernel structs with 1473 * zeroed memory so this should be OK. 1474 */ 1475 outaddr = &tmsqk; 1476 outsize = sizeof(tmsqk); 1477 } 1478 error = SYSCTL_OUT(req, outaddr, outsize); 1479 if (error != 0) 1480 break; 1481 } 1482 return (error); 1483 } 1484 1485 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmax, CTLFLAG_RD, &msginfo.msgmax, 0, 1486 "Maximum message size"); 1487 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmni, CTLFLAG_RDTUN, &msginfo.msgmni, 0, 1488 "Number of message queue identifiers"); 1489 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmnb, CTLFLAG_RDTUN, &msginfo.msgmnb, 0, 1490 "Maximum number of bytes in a queue"); 1491 SYSCTL_INT(_kern_ipc, OID_AUTO, msgtql, CTLFLAG_RDTUN, &msginfo.msgtql, 0, 1492 "Maximum number of messages in the system"); 1493 SYSCTL_INT(_kern_ipc, OID_AUTO, msgssz, CTLFLAG_RDTUN, &msginfo.msgssz, 0, 1494 "Size of a message segment"); 1495 SYSCTL_INT(_kern_ipc, OID_AUTO, msgseg, CTLFLAG_RDTUN, &msginfo.msgseg, 0, 1496 "Number of message segments"); 1497 SYSCTL_PROC(_kern_ipc, OID_AUTO, msqids, 1498 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, 1499 NULL, 0, sysctl_msqids, "", 1500 "Array of struct msqid_kernel for each potential message queue"); 1501 1502 static int 1503 msg_prison_check(void *obj, void *data) 1504 { 1505 struct prison *pr = obj; 1506 struct prison *prpr; 1507 struct vfsoptlist *opts = data; 1508 int error, jsys; 1509 1510 /* 1511 * sysvmsg is a jailsys integer. 1512 * It must be "disable" if the parent jail is disabled. 1513 */ 1514 error = vfs_copyopt(opts, "sysvmsg", &jsys, sizeof(jsys)); 1515 if (error != ENOENT) { 1516 if (error != 0) 1517 return (error); 1518 switch (jsys) { 1519 case JAIL_SYS_DISABLE: 1520 break; 1521 case JAIL_SYS_NEW: 1522 case JAIL_SYS_INHERIT: 1523 prison_lock(pr->pr_parent); 1524 prpr = osd_jail_get(pr->pr_parent, msg_prison_slot); 1525 prison_unlock(pr->pr_parent); 1526 if (prpr == NULL) 1527 return (EPERM); 1528 break; 1529 default: 1530 return (EINVAL); 1531 } 1532 } 1533 1534 return (0); 1535 } 1536 1537 static int 1538 msg_prison_set(void *obj, void *data) 1539 { 1540 struct prison *pr = obj; 1541 struct prison *tpr, *orpr, *nrpr, *trpr; 1542 struct vfsoptlist *opts = data; 1543 void *rsv; 1544 int jsys, descend; 1545 1546 /* 1547 * sysvmsg controls which jail is the root of the associated msgs (this 1548 * jail or same as the parent), or if the feature is available at all. 1549 */ 1550 if (vfs_copyopt(opts, "sysvmsg", &jsys, sizeof(jsys)) == ENOENT) 1551 jsys = vfs_flagopt(opts, "allow.sysvipc", NULL, 0) 1552 ? JAIL_SYS_INHERIT 1553 : vfs_flagopt(opts, "allow.nosysvipc", NULL, 0) 1554 ? JAIL_SYS_DISABLE 1555 : -1; 1556 if (jsys == JAIL_SYS_DISABLE) { 1557 prison_lock(pr); 1558 orpr = osd_jail_get(pr, msg_prison_slot); 1559 if (orpr != NULL) 1560 osd_jail_del(pr, msg_prison_slot); 1561 prison_unlock(pr); 1562 if (orpr != NULL) { 1563 if (orpr == pr) 1564 msg_prison_cleanup(pr); 1565 /* Disable all child jails as well. */ 1566 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1567 prison_lock(tpr); 1568 trpr = osd_jail_get(tpr, msg_prison_slot); 1569 if (trpr != NULL) { 1570 osd_jail_del(tpr, msg_prison_slot); 1571 prison_unlock(tpr); 1572 if (trpr == tpr) 1573 msg_prison_cleanup(tpr); 1574 } else { 1575 prison_unlock(tpr); 1576 descend = 0; 1577 } 1578 } 1579 } 1580 } else if (jsys != -1) { 1581 if (jsys == JAIL_SYS_NEW) 1582 nrpr = pr; 1583 else { 1584 prison_lock(pr->pr_parent); 1585 nrpr = osd_jail_get(pr->pr_parent, msg_prison_slot); 1586 prison_unlock(pr->pr_parent); 1587 } 1588 rsv = osd_reserve(msg_prison_slot); 1589 prison_lock(pr); 1590 orpr = osd_jail_get(pr, msg_prison_slot); 1591 if (orpr != nrpr) 1592 (void)osd_jail_set_reserved(pr, msg_prison_slot, rsv, 1593 nrpr); 1594 else 1595 osd_free_reserved(rsv); 1596 prison_unlock(pr); 1597 if (orpr != nrpr) { 1598 if (orpr == pr) 1599 msg_prison_cleanup(pr); 1600 if (orpr != NULL) { 1601 /* Change child jails matching the old root, */ 1602 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1603 prison_lock(tpr); 1604 trpr = osd_jail_get(tpr, 1605 msg_prison_slot); 1606 if (trpr == orpr) { 1607 (void)osd_jail_set(tpr, 1608 msg_prison_slot, nrpr); 1609 prison_unlock(tpr); 1610 if (trpr == tpr) 1611 msg_prison_cleanup(tpr); 1612 } else { 1613 prison_unlock(tpr); 1614 descend = 0; 1615 } 1616 } 1617 } 1618 } 1619 } 1620 1621 return (0); 1622 } 1623 1624 static int 1625 msg_prison_get(void *obj, void *data) 1626 { 1627 struct prison *pr = obj; 1628 struct prison *rpr; 1629 struct vfsoptlist *opts = data; 1630 int error, jsys; 1631 1632 /* Set sysvmsg based on the jail's root prison. */ 1633 prison_lock(pr); 1634 rpr = osd_jail_get(pr, msg_prison_slot); 1635 prison_unlock(pr); 1636 jsys = rpr == NULL ? JAIL_SYS_DISABLE 1637 : rpr == pr ? JAIL_SYS_NEW : JAIL_SYS_INHERIT; 1638 error = vfs_setopt(opts, "sysvmsg", &jsys, sizeof(jsys)); 1639 if (error == ENOENT) 1640 error = 0; 1641 return (error); 1642 } 1643 1644 static int 1645 msg_prison_remove(void *obj, void *data __unused) 1646 { 1647 struct prison *pr = obj; 1648 struct prison *rpr; 1649 1650 prison_lock(pr); 1651 rpr = osd_jail_get(pr, msg_prison_slot); 1652 prison_unlock(pr); 1653 if (rpr == pr) 1654 msg_prison_cleanup(pr); 1655 return (0); 1656 } 1657 1658 static void 1659 msg_prison_cleanup(struct prison *pr) 1660 { 1661 struct msqid_kernel *msqkptr; 1662 int i; 1663 1664 /* Remove any msqs that belong to this jail. */ 1665 mtx_lock(&msq_mtx); 1666 for (i = 0; i < msginfo.msgmni; i++) { 1667 msqkptr = &msqids[i]; 1668 if (msqkptr->u.msg_qbytes != 0 && 1669 msqkptr->cred != NULL && msqkptr->cred->cr_prison == pr) 1670 msq_remove(msqkptr); 1671 } 1672 mtx_unlock(&msq_mtx); 1673 } 1674 1675 SYSCTL_JAIL_PARAM_SYS_NODE(sysvmsg, CTLFLAG_RW, "SYSV message queues"); 1676 1677 #ifdef COMPAT_FREEBSD32 1678 int 1679 freebsd32_msgsys(struct thread *td, struct freebsd32_msgsys_args *uap) 1680 { 1681 1682 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1683 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1684 AUDIT_ARG_SVIPC_WHICH(uap->which); 1685 switch (uap->which) { 1686 case 0: 1687 return (freebsd7_freebsd32_msgctl(td, 1688 (struct freebsd7_freebsd32_msgctl_args *)&uap->a2)); 1689 case 2: 1690 return (freebsd32_msgsnd(td, 1691 (struct freebsd32_msgsnd_args *)&uap->a2)); 1692 case 3: 1693 return (freebsd32_msgrcv(td, 1694 (struct freebsd32_msgrcv_args *)&uap->a2)); 1695 default: 1696 return (sys_msgsys(td, (struct msgsys_args *)uap)); 1697 } 1698 #else 1699 return (nosys(td, NULL)); 1700 #endif 1701 } 1702 1703 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1704 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1705 int 1706 freebsd7_freebsd32_msgctl(struct thread *td, 1707 struct freebsd7_freebsd32_msgctl_args *uap) 1708 { 1709 struct msqid_ds msqbuf; 1710 struct msqid_ds32_old msqbuf32; 1711 int error; 1712 1713 if (uap->cmd == IPC_SET) { 1714 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32)); 1715 if (error) 1716 return (error); 1717 freebsd32_ipcperm_old_in(&msqbuf32.msg_perm, &msqbuf.msg_perm); 1718 PTRIN_CP(msqbuf32, msqbuf, __msg_first); 1719 PTRIN_CP(msqbuf32, msqbuf, __msg_last); 1720 CP(msqbuf32, msqbuf, msg_cbytes); 1721 CP(msqbuf32, msqbuf, msg_qnum); 1722 CP(msqbuf32, msqbuf, msg_qbytes); 1723 CP(msqbuf32, msqbuf, msg_lspid); 1724 CP(msqbuf32, msqbuf, msg_lrpid); 1725 CP(msqbuf32, msqbuf, msg_stime); 1726 CP(msqbuf32, msqbuf, msg_rtime); 1727 CP(msqbuf32, msqbuf, msg_ctime); 1728 } 1729 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1730 if (error) 1731 return (error); 1732 if (uap->cmd == IPC_STAT) { 1733 bzero(&msqbuf32, sizeof(msqbuf32)); 1734 freebsd32_ipcperm_old_out(&msqbuf.msg_perm, &msqbuf32.msg_perm); 1735 PTROUT_CP(msqbuf, msqbuf32, __msg_first); 1736 PTROUT_CP(msqbuf, msqbuf32, __msg_last); 1737 CP(msqbuf, msqbuf32, msg_cbytes); 1738 CP(msqbuf, msqbuf32, msg_qnum); 1739 CP(msqbuf, msqbuf32, msg_qbytes); 1740 CP(msqbuf, msqbuf32, msg_lspid); 1741 CP(msqbuf, msqbuf32, msg_lrpid); 1742 CP(msqbuf, msqbuf32, msg_stime); 1743 CP(msqbuf, msqbuf32, msg_rtime); 1744 CP(msqbuf, msqbuf32, msg_ctime); 1745 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32)); 1746 } 1747 return (error); 1748 } 1749 #endif 1750 1751 int 1752 freebsd32_msgctl(struct thread *td, struct freebsd32_msgctl_args *uap) 1753 { 1754 struct msqid_ds msqbuf; 1755 struct msqid_ds32 msqbuf32; 1756 int error; 1757 1758 if (uap->cmd == IPC_SET) { 1759 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32)); 1760 if (error) 1761 return (error); 1762 freebsd32_ipcperm_in(&msqbuf32.msg_perm, &msqbuf.msg_perm); 1763 PTRIN_CP(msqbuf32, msqbuf, __msg_first); 1764 PTRIN_CP(msqbuf32, msqbuf, __msg_last); 1765 CP(msqbuf32, msqbuf, msg_cbytes); 1766 CP(msqbuf32, msqbuf, msg_qnum); 1767 CP(msqbuf32, msqbuf, msg_qbytes); 1768 CP(msqbuf32, msqbuf, msg_lspid); 1769 CP(msqbuf32, msqbuf, msg_lrpid); 1770 CP(msqbuf32, msqbuf, msg_stime); 1771 CP(msqbuf32, msqbuf, msg_rtime); 1772 CP(msqbuf32, msqbuf, msg_ctime); 1773 } 1774 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1775 if (error) 1776 return (error); 1777 if (uap->cmd == IPC_STAT) { 1778 freebsd32_ipcperm_out(&msqbuf.msg_perm, &msqbuf32.msg_perm); 1779 PTROUT_CP(msqbuf, msqbuf32, __msg_first); 1780 PTROUT_CP(msqbuf, msqbuf32, __msg_last); 1781 CP(msqbuf, msqbuf32, msg_cbytes); 1782 CP(msqbuf, msqbuf32, msg_qnum); 1783 CP(msqbuf, msqbuf32, msg_qbytes); 1784 CP(msqbuf, msqbuf32, msg_lspid); 1785 CP(msqbuf, msqbuf32, msg_lrpid); 1786 CP(msqbuf, msqbuf32, msg_stime); 1787 CP(msqbuf, msqbuf32, msg_rtime); 1788 CP(msqbuf, msqbuf32, msg_ctime); 1789 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32)); 1790 } 1791 return (error); 1792 } 1793 1794 int 1795 freebsd32_msgsnd(struct thread *td, struct freebsd32_msgsnd_args *uap) 1796 { 1797 const void *msgp; 1798 long mtype; 1799 int32_t mtype32; 1800 int error; 1801 1802 msgp = PTRIN(uap->msgp); 1803 if ((error = copyin(msgp, &mtype32, sizeof(mtype32))) != 0) 1804 return (error); 1805 mtype = mtype32; 1806 return (kern_msgsnd(td, uap->msqid, 1807 (const char *)msgp + sizeof(mtype32), 1808 uap->msgsz, uap->msgflg, mtype)); 1809 } 1810 1811 int 1812 freebsd32_msgrcv(struct thread *td, struct freebsd32_msgrcv_args *uap) 1813 { 1814 void *msgp; 1815 long mtype; 1816 int32_t mtype32; 1817 int error; 1818 1819 msgp = PTRIN(uap->msgp); 1820 if ((error = kern_msgrcv(td, uap->msqid, 1821 (char *)msgp + sizeof(mtype32), uap->msgsz, 1822 uap->msgtyp, uap->msgflg, &mtype)) != 0) 1823 return (error); 1824 mtype32 = (int32_t)mtype; 1825 return (copyout(&mtype32, msgp, sizeof(mtype32))); 1826 } 1827 #endif 1828 1829 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1830 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1831 1832 /* XXX casting to (sy_call_t *) is bogus, as usual. */ 1833 static sy_call_t *msgcalls[] = { 1834 (sy_call_t *)freebsd7_msgctl, (sy_call_t *)sys_msgget, 1835 (sy_call_t *)sys_msgsnd, (sy_call_t *)sys_msgrcv 1836 }; 1837 1838 /* 1839 * Entry point for all MSG calls. 1840 * 1841 * XXX actually varargs. 1842 * struct msgsys_args { 1843 * int which; 1844 * int a2; 1845 * int a3; 1846 * int a4; 1847 * int a5; 1848 * int a6; 1849 * } *uap; 1850 */ 1851 int 1852 sys_msgsys(struct thread *td, struct msgsys_args *uap) 1853 { 1854 int error; 1855 1856 AUDIT_ARG_SVIPC_WHICH(uap->which); 1857 if (uap->which < 0 || uap->which >= nitems(msgcalls)) 1858 return (EINVAL); 1859 error = (*msgcalls[uap->which])(td, &uap->a2); 1860 return (error); 1861 } 1862 1863 #ifndef CP 1864 #define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0) 1865 #endif 1866 1867 #ifndef _SYS_SYSPROTO_H_ 1868 struct freebsd7_msgctl_args { 1869 int msqid; 1870 int cmd; 1871 struct msqid_ds_old *buf; 1872 }; 1873 #endif 1874 int 1875 freebsd7_msgctl(struct thread *td, struct freebsd7_msgctl_args *uap) 1876 { 1877 struct msqid_ds_old msqold; 1878 struct msqid_ds msqbuf; 1879 int error; 1880 1881 DPRINTF(("call to freebsd7_msgctl(%d, %d, %p)\n", uap->msqid, uap->cmd, 1882 uap->buf)); 1883 if (uap->cmd == IPC_SET) { 1884 error = copyin(uap->buf, &msqold, sizeof(msqold)); 1885 if (error) 1886 return (error); 1887 ipcperm_old2new(&msqold.msg_perm, &msqbuf.msg_perm); 1888 CP(msqold, msqbuf, __msg_first); 1889 CP(msqold, msqbuf, __msg_last); 1890 CP(msqold, msqbuf, msg_cbytes); 1891 CP(msqold, msqbuf, msg_qnum); 1892 CP(msqold, msqbuf, msg_qbytes); 1893 CP(msqold, msqbuf, msg_lspid); 1894 CP(msqold, msqbuf, msg_lrpid); 1895 CP(msqold, msqbuf, msg_stime); 1896 CP(msqold, msqbuf, msg_rtime); 1897 CP(msqold, msqbuf, msg_ctime); 1898 } 1899 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1900 if (error) 1901 return (error); 1902 if (uap->cmd == IPC_STAT) { 1903 bzero(&msqold, sizeof(msqold)); 1904 ipcperm_new2old(&msqbuf.msg_perm, &msqold.msg_perm); 1905 CP(msqbuf, msqold, __msg_first); 1906 CP(msqbuf, msqold, __msg_last); 1907 CP(msqbuf, msqold, msg_cbytes); 1908 CP(msqbuf, msqold, msg_qnum); 1909 CP(msqbuf, msqold, msg_qbytes); 1910 CP(msqbuf, msqold, msg_lspid); 1911 CP(msqbuf, msqold, msg_lrpid); 1912 CP(msqbuf, msqold, msg_stime); 1913 CP(msqbuf, msqold, msg_rtime); 1914 CP(msqbuf, msqold, msg_ctime); 1915 error = copyout(&msqold, uap->buf, sizeof(struct msqid_ds_old)); 1916 } 1917 return (error); 1918 } 1919 1920 #undef CP 1921 1922 #endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 || 1923 COMPAT_FREEBSD7 */
Cache object: 3b782ea1665f1a97c3414d5c54800327
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]