1 /*- 2 * Implementation of SVID messages 3 * 4 * Author: Daniel Boulet 5 * 6 * Copyright 1993 Daniel Boulet and RTMX Inc. 7 * 8 * This system call was implemented by Daniel Boulet under contract from RTMX. 9 * 10 * Redistribution and use in source forms, with and without modification, 11 * are permitted provided that this entire comment appears intact. 12 * 13 * Redistribution in binary form may occur without any restrictions. 14 * Obviously, it would be nice if you gave credit where credit is due 15 * but requiring it would be too onerous. 16 * 17 * This software is provided ``AS IS'' without any warranties of any kind. 18 */ 19 /*- 20 * SPDX-License-Identifier: BSD-2-Clause 21 * 22 * Copyright (c) 2003-2005 McAfee, Inc. 23 * Copyright (c) 2016-2017 Robert N. M. Watson 24 * All rights reserved. 25 * 26 * This software was developed for the FreeBSD Project in part by McAfee 27 * Research, the Security Research Division of McAfee, Inc under DARPA/SPAWAR 28 * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS research 29 * program. 30 * 31 * Portions of this software were developed by BAE Systems, the University of 32 * Cambridge Computer Laboratory, and Memorial University under DARPA/AFRL 33 * contract FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent 34 * Computing (TC) research program. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 48 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 55 * SUCH DAMAGE. 56 */ 57 58 #include "opt_sysvipc.h" 59 60 #include <sys/param.h> 61 #include <sys/systm.h> 62 #include <sys/sysproto.h> 63 #include <sys/kernel.h> 64 #include <sys/priv.h> 65 #include <sys/proc.h> 66 #include <sys/lock.h> 67 #include <sys/mutex.h> 68 #include <sys/module.h> 69 #include <sys/mount.h> 70 #include <sys/msg.h> 71 #include <sys/racct.h> 72 #include <sys/sx.h> 73 #include <sys/syscall.h> 74 #include <sys/syscallsubr.h> 75 #include <sys/sysent.h> 76 #include <sys/sysctl.h> 77 #include <sys/malloc.h> 78 #include <sys/jail.h> 79 80 #include <security/audit/audit.h> 81 #include <security/mac/mac_framework.h> 82 83 FEATURE(sysv_msg, "System V message queues support"); 84 85 static MALLOC_DEFINE(M_MSG, "msg", "SVID compatible message queues"); 86 87 static int msginit(void); 88 static int msgunload(void); 89 static int sysvmsg_modload(struct module *, int, void *); 90 static void msq_remove(struct msqid_kernel *); 91 static struct prison *msg_find_prison(struct ucred *); 92 static int msq_prison_cansee(struct prison *, struct msqid_kernel *); 93 static int msg_prison_check(void *, void *); 94 static int msg_prison_set(void *, void *); 95 static int msg_prison_get(void *, void *); 96 static int msg_prison_remove(void *, void *); 97 static void msg_prison_cleanup(struct prison *); 98 99 #ifdef MSG_DEBUG 100 #define DPRINTF(a) printf a 101 #else 102 #define DPRINTF(a) (void)0 103 #endif 104 105 static void msg_freehdr(struct msg *msghdr); 106 107 #ifndef MSGSSZ 108 #define MSGSSZ 8 /* Each segment must be 2^N long */ 109 #endif 110 #ifndef MSGSEG 111 #define MSGSEG 2048 /* must be less than 32767 */ 112 #endif 113 #define MSGMAX (MSGSSZ*MSGSEG) 114 #ifndef MSGMNB 115 #define MSGMNB 2048 /* max # of bytes in a queue */ 116 #endif 117 #ifndef MSGMNI 118 #define MSGMNI 40 119 #endif 120 #ifndef MSGTQL 121 #define MSGTQL 40 122 #endif 123 124 /* 125 * Based on the configuration parameters described in an SVR2 (yes, two) 126 * config(1m) man page. 127 * 128 * Each message is broken up and stored in segments that are msgssz bytes 129 * long. For efficiency reasons, this should be a power of two. Also, 130 * it doesn't make sense if it is less than 8 or greater than about 256. 131 * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of 132 * two between 8 and 1024 inclusive (and panic's if it isn't). 133 */ 134 struct msginfo msginfo = { 135 MSGMAX, /* max chars in a message */ 136 MSGMNI, /* # of message queue identifiers */ 137 MSGMNB, /* max chars in a queue */ 138 MSGTQL, /* max messages in system */ 139 MSGSSZ, /* size of a message segment */ 140 /* (must be small power of 2 greater than 4) */ 141 MSGSEG /* number of message segments */ 142 }; 143 144 /* 145 * macros to convert between msqid_ds's and msqid's. 146 * (specific to this implementation) 147 */ 148 #define MSQID(ix,ds) ((ix) & 0xffff | (((ds).msg_perm.seq << 16) & 0xffff0000)) 149 #define MSQID_IX(id) ((id) & 0xffff) 150 #define MSQID_SEQ(id) (((id) >> 16) & 0xffff) 151 152 /* 153 * The rest of this file is specific to this particular implementation. 154 */ 155 156 struct msgmap { 157 short next; /* next segment in buffer */ 158 /* -1 -> available */ 159 /* 0..(MSGSEG-1) -> index of next segment */ 160 }; 161 162 #define MSG_LOCKED 01000 /* Is this msqid_ds locked? */ 163 164 static int nfree_msgmaps; /* # of free map entries */ 165 static short free_msgmaps; /* head of linked list of free map entries */ 166 static struct msg *free_msghdrs;/* list of free msg headers */ 167 static char *msgpool; /* MSGMAX byte long msg buffer pool */ 168 static struct msgmap *msgmaps; /* MSGSEG msgmap structures */ 169 static struct msg *msghdrs; /* MSGTQL msg headers */ 170 static struct msqid_kernel *msqids; /* MSGMNI msqid_kernel struct's */ 171 static struct mtx msq_mtx; /* global mutex for message queues. */ 172 static unsigned msg_prison_slot;/* prison OSD slot */ 173 174 static struct syscall_helper_data msg_syscalls[] = { 175 SYSCALL_INIT_HELPER(msgctl), 176 SYSCALL_INIT_HELPER(msgget), 177 SYSCALL_INIT_HELPER(msgsnd), 178 SYSCALL_INIT_HELPER(msgrcv), 179 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 180 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 181 SYSCALL_INIT_HELPER(msgsys), 182 SYSCALL_INIT_HELPER_COMPAT(freebsd7_msgctl), 183 #endif 184 SYSCALL_INIT_LAST 185 }; 186 187 #ifdef COMPAT_FREEBSD32 188 #include <compat/freebsd32/freebsd32.h> 189 #include <compat/freebsd32/freebsd32_ipc.h> 190 #include <compat/freebsd32/freebsd32_proto.h> 191 #include <compat/freebsd32/freebsd32_signal.h> 192 #include <compat/freebsd32/freebsd32_syscall.h> 193 #include <compat/freebsd32/freebsd32_util.h> 194 195 static struct syscall_helper_data msg32_syscalls[] = { 196 SYSCALL32_INIT_HELPER(freebsd32_msgctl), 197 SYSCALL32_INIT_HELPER(freebsd32_msgsnd), 198 SYSCALL32_INIT_HELPER(freebsd32_msgrcv), 199 SYSCALL32_INIT_HELPER_COMPAT(msgget), 200 SYSCALL32_INIT_HELPER(freebsd32_msgsys), 201 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 202 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 203 SYSCALL32_INIT_HELPER(freebsd7_freebsd32_msgctl), 204 #endif 205 SYSCALL_INIT_LAST 206 }; 207 #endif 208 209 static int 210 msginit(void) 211 { 212 struct prison *pr; 213 void **rsv; 214 int i, error; 215 osd_method_t methods[PR_MAXMETHOD] = { 216 [PR_METHOD_CHECK] = msg_prison_check, 217 [PR_METHOD_SET] = msg_prison_set, 218 [PR_METHOD_GET] = msg_prison_get, 219 [PR_METHOD_REMOVE] = msg_prison_remove, 220 }; 221 222 msginfo.msgmax = msginfo.msgseg * msginfo.msgssz; 223 msgpool = malloc(msginfo.msgmax, M_MSG, M_WAITOK); 224 msgmaps = malloc(sizeof(struct msgmap) * msginfo.msgseg, M_MSG, M_WAITOK); 225 msghdrs = malloc(sizeof(struct msg) * msginfo.msgtql, M_MSG, M_WAITOK); 226 msqids = malloc(sizeof(struct msqid_kernel) * msginfo.msgmni, M_MSG, 227 M_WAITOK | M_ZERO); 228 229 /* 230 * msginfo.msgssz should be a power of two for efficiency reasons. 231 * It is also pretty silly if msginfo.msgssz is less than 8 232 * or greater than about 256 so ... 233 */ 234 235 i = 8; 236 while (i < 1024 && i != msginfo.msgssz) 237 i <<= 1; 238 if (i != msginfo.msgssz) { 239 DPRINTF(("msginfo.msgssz=%d (0x%x)\n", msginfo.msgssz, 240 msginfo.msgssz)); 241 panic("msginfo.msgssz not a small power of 2"); 242 } 243 244 if (msginfo.msgseg > 32767) { 245 DPRINTF(("msginfo.msgseg=%d\n", msginfo.msgseg)); 246 panic("msginfo.msgseg > 32767"); 247 } 248 249 for (i = 0; i < msginfo.msgseg; i++) { 250 if (i > 0) 251 msgmaps[i-1].next = i; 252 msgmaps[i].next = -1; /* implies entry is available */ 253 } 254 free_msgmaps = 0; 255 nfree_msgmaps = msginfo.msgseg; 256 257 for (i = 0; i < msginfo.msgtql; i++) { 258 msghdrs[i].msg_type = 0; 259 if (i > 0) 260 msghdrs[i-1].msg_next = &msghdrs[i]; 261 msghdrs[i].msg_next = NULL; 262 #ifdef MAC 263 mac_sysvmsg_init(&msghdrs[i]); 264 #endif 265 } 266 free_msghdrs = &msghdrs[0]; 267 268 for (i = 0; i < msginfo.msgmni; i++) { 269 msqids[i].u.msg_qbytes = 0; /* implies entry is available */ 270 msqids[i].u.msg_perm.seq = 0; /* reset to a known value */ 271 msqids[i].u.msg_perm.mode = 0; 272 #ifdef MAC 273 mac_sysvmsq_init(&msqids[i]); 274 #endif 275 } 276 mtx_init(&msq_mtx, "msq", NULL, MTX_DEF); 277 278 /* Set current prisons according to their allow.sysvipc. */ 279 msg_prison_slot = osd_jail_register(NULL, methods); 280 rsv = osd_reserve(msg_prison_slot); 281 prison_lock(&prison0); 282 (void)osd_jail_set_reserved(&prison0, msg_prison_slot, rsv, &prison0); 283 prison_unlock(&prison0); 284 rsv = NULL; 285 sx_slock(&allprison_lock); 286 TAILQ_FOREACH(pr, &allprison, pr_list) { 287 if (rsv == NULL) 288 rsv = osd_reserve(msg_prison_slot); 289 prison_lock(pr); 290 if (pr->pr_allow & PR_ALLOW_SYSVIPC) { 291 (void)osd_jail_set_reserved(pr, msg_prison_slot, rsv, 292 &prison0); 293 rsv = NULL; 294 } 295 prison_unlock(pr); 296 } 297 if (rsv != NULL) 298 osd_free_reserved(rsv); 299 sx_sunlock(&allprison_lock); 300 301 error = syscall_helper_register(msg_syscalls, SY_THR_STATIC_KLD); 302 if (error != 0) 303 return (error); 304 #ifdef COMPAT_FREEBSD32 305 error = syscall32_helper_register(msg32_syscalls, SY_THR_STATIC_KLD); 306 if (error != 0) 307 return (error); 308 #endif 309 return (0); 310 } 311 312 static int 313 msgunload(void) 314 { 315 struct msqid_kernel *msqkptr; 316 int msqid; 317 #ifdef MAC 318 int i; 319 #endif 320 321 syscall_helper_unregister(msg_syscalls); 322 #ifdef COMPAT_FREEBSD32 323 syscall32_helper_unregister(msg32_syscalls); 324 #endif 325 326 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 327 msqkptr = &msqids[msqid]; 328 if (msqkptr->u.msg_qbytes != 0 || 329 (msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) 330 break; 331 } 332 if (msqid != msginfo.msgmni) 333 return (EBUSY); 334 335 if (msg_prison_slot != 0) 336 osd_jail_deregister(msg_prison_slot); 337 #ifdef MAC 338 for (i = 0; i < msginfo.msgtql; i++) 339 mac_sysvmsg_destroy(&msghdrs[i]); 340 for (msqid = 0; msqid < msginfo.msgmni; msqid++) 341 mac_sysvmsq_destroy(&msqids[msqid]); 342 #endif 343 free(msgpool, M_MSG); 344 free(msgmaps, M_MSG); 345 free(msghdrs, M_MSG); 346 free(msqids, M_MSG); 347 mtx_destroy(&msq_mtx); 348 return (0); 349 } 350 351 static int 352 sysvmsg_modload(struct module *module, int cmd, void *arg) 353 { 354 int error = 0; 355 356 switch (cmd) { 357 case MOD_LOAD: 358 error = msginit(); 359 if (error != 0) 360 msgunload(); 361 break; 362 case MOD_UNLOAD: 363 error = msgunload(); 364 break; 365 case MOD_SHUTDOWN: 366 break; 367 default: 368 error = EINVAL; 369 break; 370 } 371 return (error); 372 } 373 374 static moduledata_t sysvmsg_mod = { 375 "sysvmsg", 376 &sysvmsg_modload, 377 NULL 378 }; 379 380 DECLARE_MODULE(sysvmsg, sysvmsg_mod, SI_SUB_SYSV_MSG, SI_ORDER_FIRST); 381 MODULE_VERSION(sysvmsg, 1); 382 383 static void 384 msg_freehdr(struct msg *msghdr) 385 { 386 while (msghdr->msg_ts > 0) { 387 short next; 388 if (msghdr->msg_spot < 0 || msghdr->msg_spot >= msginfo.msgseg) 389 panic("msghdr->msg_spot out of range"); 390 next = msgmaps[msghdr->msg_spot].next; 391 msgmaps[msghdr->msg_spot].next = free_msgmaps; 392 free_msgmaps = msghdr->msg_spot; 393 nfree_msgmaps++; 394 msghdr->msg_spot = next; 395 if (msghdr->msg_ts >= msginfo.msgssz) 396 msghdr->msg_ts -= msginfo.msgssz; 397 else 398 msghdr->msg_ts = 0; 399 } 400 if (msghdr->msg_spot != -1) 401 panic("msghdr->msg_spot != -1"); 402 msghdr->msg_next = free_msghdrs; 403 free_msghdrs = msghdr; 404 #ifdef MAC 405 mac_sysvmsg_cleanup(msghdr); 406 #endif 407 } 408 409 static void 410 msq_remove(struct msqid_kernel *msqkptr) 411 { 412 struct msg *msghdr; 413 414 racct_sub_cred(msqkptr->cred, RACCT_NMSGQ, 1); 415 racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, msqkptr->u.msg_qnum); 416 racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msqkptr->u.msg_cbytes); 417 crfree(msqkptr->cred); 418 msqkptr->cred = NULL; 419 420 /* Free the message headers */ 421 msghdr = msqkptr->u.__msg_first; 422 while (msghdr != NULL) { 423 struct msg *msghdr_tmp; 424 425 /* Free the segments of each message */ 426 msqkptr->u.msg_cbytes -= msghdr->msg_ts; 427 msqkptr->u.msg_qnum--; 428 msghdr_tmp = msghdr; 429 msghdr = msghdr->msg_next; 430 msg_freehdr(msghdr_tmp); 431 } 432 433 if (msqkptr->u.msg_cbytes != 0) 434 panic("msg_cbytes is screwed up"); 435 if (msqkptr->u.msg_qnum != 0) 436 panic("msg_qnum is screwed up"); 437 438 msqkptr->u.msg_qbytes = 0; /* Mark it as free */ 439 440 #ifdef MAC 441 mac_sysvmsq_cleanup(msqkptr); 442 #endif 443 444 wakeup(msqkptr); 445 } 446 447 static struct prison * 448 msg_find_prison(struct ucred *cred) 449 { 450 struct prison *pr, *rpr; 451 452 pr = cred->cr_prison; 453 prison_lock(pr); 454 rpr = osd_jail_get(pr, msg_prison_slot); 455 prison_unlock(pr); 456 return rpr; 457 } 458 459 static int 460 msq_prison_cansee(struct prison *rpr, struct msqid_kernel *msqkptr) 461 { 462 463 if (msqkptr->cred == NULL || 464 !(rpr == msqkptr->cred->cr_prison || 465 prison_ischild(rpr, msqkptr->cred->cr_prison))) 466 return (EINVAL); 467 return (0); 468 } 469 470 #ifndef _SYS_SYSPROTO_H_ 471 struct msgctl_args { 472 int msqid; 473 int cmd; 474 struct msqid_ds *buf; 475 }; 476 #endif 477 int 478 sys_msgctl(struct thread *td, struct msgctl_args *uap) 479 { 480 int msqid = uap->msqid; 481 int cmd = uap->cmd; 482 struct msqid_ds msqbuf; 483 int error; 484 485 DPRINTF(("call to msgctl(%d, %d, %p)\n", msqid, cmd, uap->buf)); 486 if (cmd == IPC_SET && 487 (error = copyin(uap->buf, &msqbuf, sizeof(msqbuf))) != 0) 488 return (error); 489 error = kern_msgctl(td, msqid, cmd, &msqbuf); 490 if (cmd == IPC_STAT && error == 0) 491 error = copyout(&msqbuf, uap->buf, sizeof(struct msqid_ds)); 492 return (error); 493 } 494 495 int 496 kern_msgctl(struct thread *td, int msqid, int cmd, struct msqid_ds *msqbuf) 497 { 498 int rval, error, msqix; 499 struct msqid_kernel *msqkptr; 500 struct prison *rpr; 501 502 rpr = msg_find_prison(td->td_ucred); 503 if (rpr == NULL) 504 return (ENOSYS); 505 506 AUDIT_ARG_SVIPC_CMD(cmd); 507 AUDIT_ARG_SVIPC_ID(msqid); 508 msqix = IPCID_TO_IX(msqid); 509 510 if (msqix < 0 || msqix >= msginfo.msgmni) { 511 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 512 msginfo.msgmni)); 513 return (EINVAL); 514 } 515 516 msqkptr = &msqids[msqix]; 517 518 mtx_lock(&msq_mtx); 519 if (msqkptr->u.msg_qbytes == 0) { 520 DPRINTF(("no such msqid\n")); 521 error = EINVAL; 522 goto done2; 523 } 524 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 525 DPRINTF(("wrong sequence number\n")); 526 error = EINVAL; 527 goto done2; 528 } 529 530 error = msq_prison_cansee(rpr, msqkptr); 531 if (error != 0) { 532 DPRINTF(("requester can't see prison\n")); 533 goto done2; 534 } 535 536 #ifdef MAC 537 error = mac_sysvmsq_check_msqctl(td->td_ucred, msqkptr, cmd); 538 if (error != 0) 539 goto done2; 540 #endif 541 542 error = 0; 543 rval = 0; 544 545 switch (cmd) { 546 case IPC_RMID: 547 { 548 #ifdef MAC 549 struct msg *msghdr; 550 #endif 551 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M))) 552 goto done2; 553 554 #ifdef MAC 555 /* 556 * Check that the thread has MAC access permissions to 557 * individual msghdrs. Note: We need to do this in a 558 * separate loop because the actual loop alters the 559 * msq/msghdr info as it progresses, and there is no going 560 * back if half the way through we discover that the 561 * thread cannot free a certain msghdr. The msq will get 562 * into an inconsistent state. 563 */ 564 for (msghdr = msqkptr->u.__msg_first; msghdr != NULL; 565 msghdr = msghdr->msg_next) { 566 error = mac_sysvmsq_check_msgrmid(td->td_ucred, msghdr); 567 if (error != 0) 568 goto done2; 569 } 570 #endif 571 572 msq_remove(msqkptr); 573 } 574 575 break; 576 577 case IPC_SET: 578 AUDIT_ARG_SVIPC_PERM(&msqbuf->msg_perm); 579 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M))) 580 goto done2; 581 if (msqbuf->msg_qbytes > msqkptr->u.msg_qbytes) { 582 error = priv_check(td, PRIV_IPC_MSGSIZE); 583 if (error) 584 goto done2; 585 } 586 if (msqbuf->msg_qbytes > msginfo.msgmnb) { 587 DPRINTF(("can't increase msg_qbytes beyond %d" 588 "(truncating)\n", msginfo.msgmnb)); 589 msqbuf->msg_qbytes = msginfo.msgmnb; /* silently restrict qbytes to system limit */ 590 } 591 if (msqbuf->msg_qbytes == 0) { 592 DPRINTF(("can't reduce msg_qbytes to 0\n")); 593 error = EINVAL; /* non-standard errno! */ 594 goto done2; 595 } 596 msqkptr->u.msg_perm.uid = msqbuf->msg_perm.uid; /* change the owner */ 597 msqkptr->u.msg_perm.gid = msqbuf->msg_perm.gid; /* change the owner */ 598 msqkptr->u.msg_perm.mode = (msqkptr->u.msg_perm.mode & ~0777) | 599 (msqbuf->msg_perm.mode & 0777); 600 msqkptr->u.msg_qbytes = msqbuf->msg_qbytes; 601 msqkptr->u.msg_ctime = time_second; 602 break; 603 604 case IPC_STAT: 605 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) { 606 DPRINTF(("requester doesn't have read access\n")); 607 goto done2; 608 } 609 *msqbuf = msqkptr->u; 610 if (td->td_ucred->cr_prison != msqkptr->cred->cr_prison) 611 msqbuf->msg_perm.key = IPC_PRIVATE; 612 613 /* 614 * Try to hide the fact that the structure layout is shared by 615 * both the kernel and userland. These pointers are not useful 616 * to userspace. 617 */ 618 msqbuf->__msg_first = msqbuf->__msg_last = NULL; 619 break; 620 621 default: 622 DPRINTF(("invalid command %d\n", cmd)); 623 error = EINVAL; 624 goto done2; 625 } 626 627 if (error == 0) 628 td->td_retval[0] = rval; 629 done2: 630 mtx_unlock(&msq_mtx); 631 return (error); 632 } 633 634 #ifndef _SYS_SYSPROTO_H_ 635 struct msgget_args { 636 key_t key; 637 int msgflg; 638 }; 639 #endif 640 641 int 642 sys_msgget(struct thread *td, struct msgget_args *uap) 643 { 644 int msqid, error = 0; 645 int key = uap->key; 646 int msgflg = uap->msgflg; 647 struct ucred *cred = td->td_ucred; 648 struct msqid_kernel *msqkptr = NULL; 649 650 DPRINTF(("msgget(0x%x, 0%o)\n", key, msgflg)); 651 652 if (msg_find_prison(cred) == NULL) 653 return (ENOSYS); 654 655 mtx_lock(&msq_mtx); 656 if (key != IPC_PRIVATE) { 657 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 658 msqkptr = &msqids[msqid]; 659 if (msqkptr->u.msg_qbytes != 0 && 660 msqkptr->cred != NULL && 661 msqkptr->cred->cr_prison == cred->cr_prison && 662 msqkptr->u.msg_perm.key == key) 663 break; 664 } 665 if (msqid < msginfo.msgmni) { 666 DPRINTF(("found public key\n")); 667 if ((msgflg & IPC_CREAT) && (msgflg & IPC_EXCL)) { 668 DPRINTF(("not exclusive\n")); 669 error = EEXIST; 670 goto done2; 671 } 672 AUDIT_ARG_SVIPC_ID(IXSEQ_TO_IPCID(msqid, 673 msqkptr->u.msg_perm)); 674 if ((error = ipcperm(td, &msqkptr->u.msg_perm, 675 msgflg & 0700))) { 676 DPRINTF(("requester doesn't have 0%o access\n", 677 msgflg & 0700)); 678 goto done2; 679 } 680 #ifdef MAC 681 error = mac_sysvmsq_check_msqget(cred, msqkptr); 682 if (error != 0) 683 goto done2; 684 #endif 685 goto found; 686 } 687 } 688 689 DPRINTF(("need to allocate the msqid_ds\n")); 690 if (key == IPC_PRIVATE || (msgflg & IPC_CREAT)) { 691 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 692 /* 693 * Look for an unallocated and unlocked msqid_ds. 694 * msqid_ds's can be locked by msgsnd or msgrcv while 695 * they are copying the message in/out. We can't 696 * re-use the entry until they release it. 697 */ 698 msqkptr = &msqids[msqid]; 699 if (msqkptr->u.msg_qbytes == 0 && 700 (msqkptr->u.msg_perm.mode & MSG_LOCKED) == 0) 701 break; 702 } 703 if (msqid == msginfo.msgmni) { 704 DPRINTF(("no more msqid_ds's available\n")); 705 error = ENOSPC; 706 goto done2; 707 } 708 #ifdef RACCT 709 if (racct_enable) { 710 PROC_LOCK(td->td_proc); 711 error = racct_add(td->td_proc, RACCT_NMSGQ, 1); 712 PROC_UNLOCK(td->td_proc); 713 if (error != 0) { 714 error = ENOSPC; 715 goto done2; 716 } 717 } 718 #endif 719 DPRINTF(("msqid %d is available\n", msqid)); 720 msqkptr->u.msg_perm.key = key; 721 msqkptr->u.msg_perm.cuid = cred->cr_uid; 722 msqkptr->u.msg_perm.uid = cred->cr_uid; 723 msqkptr->u.msg_perm.cgid = cred->cr_gid; 724 msqkptr->u.msg_perm.gid = cred->cr_gid; 725 msqkptr->u.msg_perm.mode = (msgflg & 0777); 726 msqkptr->cred = crhold(cred); 727 /* Make sure that the returned msqid is unique */ 728 msqkptr->u.msg_perm.seq = (msqkptr->u.msg_perm.seq + 1) & 0x7fff; 729 msqkptr->u.__msg_first = NULL; 730 msqkptr->u.__msg_last = NULL; 731 msqkptr->u.msg_cbytes = 0; 732 msqkptr->u.msg_qnum = 0; 733 msqkptr->u.msg_qbytes = msginfo.msgmnb; 734 msqkptr->u.msg_lspid = 0; 735 msqkptr->u.msg_lrpid = 0; 736 msqkptr->u.msg_stime = 0; 737 msqkptr->u.msg_rtime = 0; 738 msqkptr->u.msg_ctime = time_second; 739 #ifdef MAC 740 mac_sysvmsq_create(cred, msqkptr); 741 #endif 742 AUDIT_ARG_SVIPC_PERM(&msqkptr->u.msg_perm); 743 } else { 744 DPRINTF(("didn't find it and wasn't asked to create it\n")); 745 error = ENOENT; 746 goto done2; 747 } 748 749 found: 750 /* Construct the unique msqid */ 751 td->td_retval[0] = IXSEQ_TO_IPCID(msqid, msqkptr->u.msg_perm); 752 done2: 753 mtx_unlock(&msq_mtx); 754 return (error); 755 } 756 757 #ifndef _SYS_SYSPROTO_H_ 758 struct msgsnd_args { 759 int msqid; 760 const void *msgp; /* XXX msgp is actually mtext. */ 761 size_t msgsz; 762 int msgflg; 763 }; 764 #endif 765 int 766 kern_msgsnd(struct thread *td, int msqid, const void *msgp, 767 size_t msgsz, int msgflg, long mtype) 768 { 769 int msqix, segs_needed, error = 0; 770 struct msqid_kernel *msqkptr; 771 struct msg *msghdr; 772 struct prison *rpr; 773 short next; 774 #ifdef RACCT 775 size_t saved_msgsz = 0; 776 #endif 777 778 rpr = msg_find_prison(td->td_ucred); 779 if (rpr == NULL) 780 return (ENOSYS); 781 782 mtx_lock(&msq_mtx); 783 AUDIT_ARG_SVIPC_ID(msqid); 784 msqix = IPCID_TO_IX(msqid); 785 786 if (msqix < 0 || msqix >= msginfo.msgmni) { 787 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 788 msginfo.msgmni)); 789 error = EINVAL; 790 goto done2; 791 } 792 793 msqkptr = &msqids[msqix]; 794 AUDIT_ARG_SVIPC_PERM(&msqkptr->u.msg_perm); 795 if (msqkptr->u.msg_qbytes == 0) { 796 DPRINTF(("no such message queue id\n")); 797 error = EINVAL; 798 goto done2; 799 } 800 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 801 DPRINTF(("wrong sequence number\n")); 802 error = EINVAL; 803 goto done2; 804 } 805 806 if ((error = msq_prison_cansee(rpr, msqkptr))) { 807 DPRINTF(("requester can't see prison\n")); 808 goto done2; 809 } 810 811 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_W))) { 812 DPRINTF(("requester doesn't have write access\n")); 813 goto done2; 814 } 815 816 #ifdef MAC 817 error = mac_sysvmsq_check_msqsnd(td->td_ucred, msqkptr); 818 if (error != 0) 819 goto done2; 820 #endif 821 822 #ifdef RACCT 823 if (racct_enable) { 824 PROC_LOCK(td->td_proc); 825 if (racct_add(td->td_proc, RACCT_MSGQQUEUED, 1)) { 826 PROC_UNLOCK(td->td_proc); 827 error = EAGAIN; 828 goto done2; 829 } 830 saved_msgsz = msgsz; 831 if (racct_add(td->td_proc, RACCT_MSGQSIZE, msgsz)) { 832 racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1); 833 PROC_UNLOCK(td->td_proc); 834 error = EAGAIN; 835 goto done2; 836 } 837 PROC_UNLOCK(td->td_proc); 838 } 839 #endif 840 841 segs_needed = howmany(msgsz, msginfo.msgssz); 842 DPRINTF(("msgsz=%zu, msgssz=%d, segs_needed=%d\n", msgsz, 843 msginfo.msgssz, segs_needed)); 844 for (;;) { 845 int need_more_resources = 0; 846 847 /* 848 * check msgsz 849 * (inside this loop in case msg_qbytes changes while we sleep) 850 */ 851 852 if (msgsz > msqkptr->u.msg_qbytes) { 853 DPRINTF(("msgsz > msqkptr->u.msg_qbytes\n")); 854 error = EINVAL; 855 goto done3; 856 } 857 858 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) { 859 DPRINTF(("msqid is locked\n")); 860 need_more_resources = 1; 861 } 862 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) { 863 DPRINTF(("msgsz + msg_cbytes > msg_qbytes\n")); 864 need_more_resources = 1; 865 } 866 if (segs_needed > nfree_msgmaps) { 867 DPRINTF(("segs_needed > nfree_msgmaps\n")); 868 need_more_resources = 1; 869 } 870 if (free_msghdrs == NULL) { 871 DPRINTF(("no more msghdrs\n")); 872 need_more_resources = 1; 873 } 874 875 if (need_more_resources) { 876 int we_own_it; 877 878 if ((msgflg & IPC_NOWAIT) != 0) { 879 DPRINTF(("need more resources but caller " 880 "doesn't want to wait\n")); 881 error = EAGAIN; 882 goto done3; 883 } 884 885 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) { 886 DPRINTF(("we don't own the msqid_ds\n")); 887 we_own_it = 0; 888 } else { 889 /* Force later arrivals to wait for our 890 request */ 891 DPRINTF(("we own the msqid_ds\n")); 892 msqkptr->u.msg_perm.mode |= MSG_LOCKED; 893 we_own_it = 1; 894 } 895 DPRINTF(("msgsnd: goodnight\n")); 896 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH, 897 "msgsnd", hz); 898 DPRINTF(("msgsnd: good morning, error=%d\n", error)); 899 if (we_own_it) 900 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 901 if (error == EWOULDBLOCK) { 902 DPRINTF(("msgsnd: timed out\n")); 903 continue; 904 } 905 if (error != 0) { 906 DPRINTF(("msgsnd: interrupted system call\n")); 907 error = EINTR; 908 goto done3; 909 } 910 911 /* 912 * Make sure that the msq queue still exists 913 */ 914 915 if (msqkptr->u.msg_qbytes == 0) { 916 DPRINTF(("msqid deleted\n")); 917 error = EIDRM; 918 goto done3; 919 } 920 921 } else { 922 DPRINTF(("got all the resources that we need\n")); 923 break; 924 } 925 } 926 927 /* 928 * We have the resources that we need. 929 * Make sure! 930 */ 931 932 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) 933 panic("msg_perm.mode & MSG_LOCKED"); 934 if (segs_needed > nfree_msgmaps) 935 panic("segs_needed > nfree_msgmaps"); 936 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) 937 panic("msgsz + msg_cbytes > msg_qbytes"); 938 if (free_msghdrs == NULL) 939 panic("no more msghdrs"); 940 941 /* 942 * Re-lock the msqid_ds in case we page-fault when copying in the 943 * message 944 */ 945 946 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) 947 panic("msqid_ds is already locked"); 948 msqkptr->u.msg_perm.mode |= MSG_LOCKED; 949 950 /* 951 * Allocate a message header 952 */ 953 954 msghdr = free_msghdrs; 955 free_msghdrs = msghdr->msg_next; 956 msghdr->msg_spot = -1; 957 msghdr->msg_ts = msgsz; 958 msghdr->msg_type = mtype; 959 #ifdef MAC 960 /* 961 * XXXMAC: Should the mac_sysvmsq_check_msgmsq check follow here 962 * immediately? Or, should it be checked just before the msg is 963 * enqueued in the msgq (as it is done now)? 964 */ 965 mac_sysvmsg_create(td->td_ucred, msqkptr, msghdr); 966 #endif 967 968 /* 969 * Allocate space for the message 970 */ 971 972 while (segs_needed > 0) { 973 if (nfree_msgmaps <= 0) 974 panic("not enough msgmaps"); 975 if (free_msgmaps == -1) 976 panic("nil free_msgmaps"); 977 next = free_msgmaps; 978 if (next <= -1) 979 panic("next too low #1"); 980 if (next >= msginfo.msgseg) 981 panic("next out of range #1"); 982 DPRINTF(("allocating segment %d to message\n", next)); 983 free_msgmaps = msgmaps[next].next; 984 nfree_msgmaps--; 985 msgmaps[next].next = msghdr->msg_spot; 986 msghdr->msg_spot = next; 987 segs_needed--; 988 } 989 990 /* 991 * Validate the message type 992 */ 993 994 if (msghdr->msg_type < 1) { 995 msg_freehdr(msghdr); 996 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 997 wakeup(msqkptr); 998 DPRINTF(("mtype (%ld) < 1\n", msghdr->msg_type)); 999 error = EINVAL; 1000 goto done3; 1001 } 1002 1003 /* 1004 * Copy in the message body 1005 */ 1006 1007 next = msghdr->msg_spot; 1008 while (msgsz > 0) { 1009 size_t tlen; 1010 if (msgsz > msginfo.msgssz) 1011 tlen = msginfo.msgssz; 1012 else 1013 tlen = msgsz; 1014 if (next <= -1) 1015 panic("next too low #2"); 1016 if (next >= msginfo.msgseg) 1017 panic("next out of range #2"); 1018 mtx_unlock(&msq_mtx); 1019 if ((error = copyin(msgp, &msgpool[next * msginfo.msgssz], 1020 tlen)) != 0) { 1021 mtx_lock(&msq_mtx); 1022 DPRINTF(("error %d copying in message segment\n", 1023 error)); 1024 msg_freehdr(msghdr); 1025 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 1026 wakeup(msqkptr); 1027 goto done3; 1028 } 1029 mtx_lock(&msq_mtx); 1030 msgsz -= tlen; 1031 msgp = (const char *)msgp + tlen; 1032 next = msgmaps[next].next; 1033 } 1034 if (next != -1) 1035 panic("didn't use all the msg segments"); 1036 1037 /* 1038 * We've got the message. Unlock the msqid_ds. 1039 */ 1040 1041 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 1042 1043 /* 1044 * Make sure that the msqid_ds is still allocated. 1045 */ 1046 1047 if (msqkptr->u.msg_qbytes == 0) { 1048 msg_freehdr(msghdr); 1049 wakeup(msqkptr); 1050 error = EIDRM; 1051 goto done3; 1052 } 1053 1054 #ifdef MAC 1055 /* 1056 * Note: Since the task/thread allocates the msghdr and usually 1057 * primes it with its own MAC label, for a majority of policies, it 1058 * won't be necessary to check whether the msghdr has access 1059 * permissions to the msgq. The mac_sysvmsq_check_msqsnd check would 1060 * suffice in that case. However, this hook may be required where 1061 * individual policies derive a non-identical label for the msghdr 1062 * from the current thread label and may want to check the msghdr 1063 * enqueue permissions, along with read/write permissions to the 1064 * msgq. 1065 */ 1066 error = mac_sysvmsq_check_msgmsq(td->td_ucred, msghdr, msqkptr); 1067 if (error != 0) { 1068 msg_freehdr(msghdr); 1069 wakeup(msqkptr); 1070 goto done3; 1071 } 1072 #endif 1073 1074 /* 1075 * Put the message into the queue 1076 */ 1077 if (msqkptr->u.__msg_first == NULL) { 1078 msqkptr->u.__msg_first = msghdr; 1079 msqkptr->u.__msg_last = msghdr; 1080 } else { 1081 msqkptr->u.__msg_last->msg_next = msghdr; 1082 msqkptr->u.__msg_last = msghdr; 1083 } 1084 msqkptr->u.__msg_last->msg_next = NULL; 1085 1086 msqkptr->u.msg_cbytes += msghdr->msg_ts; 1087 msqkptr->u.msg_qnum++; 1088 msqkptr->u.msg_lspid = td->td_proc->p_pid; 1089 msqkptr->u.msg_stime = time_second; 1090 1091 wakeup(msqkptr); 1092 td->td_retval[0] = 0; 1093 done3: 1094 #ifdef RACCT 1095 if (racct_enable && error != 0) { 1096 PROC_LOCK(td->td_proc); 1097 racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1); 1098 racct_sub(td->td_proc, RACCT_MSGQSIZE, saved_msgsz); 1099 PROC_UNLOCK(td->td_proc); 1100 } 1101 #endif 1102 done2: 1103 mtx_unlock(&msq_mtx); 1104 return (error); 1105 } 1106 1107 int 1108 sys_msgsnd(struct thread *td, struct msgsnd_args *uap) 1109 { 1110 int error; 1111 long mtype; 1112 1113 DPRINTF(("call to msgsnd(%d, %p, %zu, %d)\n", uap->msqid, uap->msgp, 1114 uap->msgsz, uap->msgflg)); 1115 1116 if ((error = copyin(uap->msgp, &mtype, sizeof(mtype))) != 0) { 1117 DPRINTF(("error %d copying the message type\n", error)); 1118 return (error); 1119 } 1120 return (kern_msgsnd(td, uap->msqid, 1121 (const char *)uap->msgp + sizeof(mtype), 1122 uap->msgsz, uap->msgflg, mtype)); 1123 } 1124 1125 #ifndef _SYS_SYSPROTO_H_ 1126 struct msgrcv_args { 1127 int msqid; 1128 void *msgp; 1129 size_t msgsz; 1130 long msgtyp; 1131 int msgflg; 1132 }; 1133 #endif 1134 /* XXX msgp is actually mtext. */ 1135 int 1136 kern_msgrcv(struct thread *td, int msqid, void *msgp, size_t msgsz, long msgtyp, 1137 int msgflg, long *mtype) 1138 { 1139 size_t len; 1140 struct msqid_kernel *msqkptr; 1141 struct msg *msghdr; 1142 struct prison *rpr; 1143 int msqix, error = 0; 1144 short next; 1145 1146 rpr = msg_find_prison(td->td_ucred); 1147 if (rpr == NULL) 1148 return (ENOSYS); 1149 1150 AUDIT_ARG_SVIPC_ID(msqid); 1151 msqix = IPCID_TO_IX(msqid); 1152 1153 if (msqix < 0 || msqix >= msginfo.msgmni) { 1154 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 1155 msginfo.msgmni)); 1156 return (EINVAL); 1157 } 1158 1159 msqkptr = &msqids[msqix]; 1160 mtx_lock(&msq_mtx); 1161 AUDIT_ARG_SVIPC_PERM(&msqkptr->u.msg_perm); 1162 if (msqkptr->u.msg_qbytes == 0) { 1163 DPRINTF(("no such message queue id\n")); 1164 error = EINVAL; 1165 goto done2; 1166 } 1167 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 1168 DPRINTF(("wrong sequence number\n")); 1169 error = EINVAL; 1170 goto done2; 1171 } 1172 1173 if ((error = msq_prison_cansee(rpr, msqkptr))) { 1174 DPRINTF(("requester can't see prison\n")); 1175 goto done2; 1176 } 1177 1178 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) { 1179 DPRINTF(("requester doesn't have read access\n")); 1180 goto done2; 1181 } 1182 1183 #ifdef MAC 1184 error = mac_sysvmsq_check_msqrcv(td->td_ucred, msqkptr); 1185 if (error != 0) 1186 goto done2; 1187 #endif 1188 1189 msghdr = NULL; 1190 while (msghdr == NULL) { 1191 if (msgtyp == 0) { 1192 msghdr = msqkptr->u.__msg_first; 1193 if (msghdr != NULL) { 1194 if (msgsz < msghdr->msg_ts && 1195 (msgflg & MSG_NOERROR) == 0) { 1196 DPRINTF(("first message on the queue " 1197 "is too big (want %zu, got %d)\n", 1198 msgsz, msghdr->msg_ts)); 1199 error = E2BIG; 1200 goto done2; 1201 } 1202 #ifdef MAC 1203 error = mac_sysvmsq_check_msgrcv(td->td_ucred, 1204 msghdr); 1205 if (error != 0) 1206 goto done2; 1207 #endif 1208 if (msqkptr->u.__msg_first == 1209 msqkptr->u.__msg_last) { 1210 msqkptr->u.__msg_first = NULL; 1211 msqkptr->u.__msg_last = NULL; 1212 } else { 1213 msqkptr->u.__msg_first = msghdr->msg_next; 1214 if (msqkptr->u.__msg_first == NULL) 1215 panic("msg_first/last screwed up #1"); 1216 } 1217 } 1218 } else { 1219 struct msg *previous; 1220 struct msg **prev; 1221 1222 previous = NULL; 1223 prev = &(msqkptr->u.__msg_first); 1224 while ((msghdr = *prev) != NULL) { 1225 /* 1226 * Is this message's type an exact match or is 1227 * this message's type less than or equal to 1228 * the absolute value of a negative msgtyp? 1229 * Note that the second half of this test can 1230 * NEVER be true if msgtyp is positive since 1231 * msg_type is always positive! 1232 */ 1233 1234 if (msgtyp == msghdr->msg_type || 1235 msghdr->msg_type <= -msgtyp) { 1236 DPRINTF(("found message type %ld, " 1237 "requested %ld\n", 1238 msghdr->msg_type, msgtyp)); 1239 if (msgsz < msghdr->msg_ts && 1240 (msgflg & MSG_NOERROR) == 0) { 1241 DPRINTF(("requested message " 1242 "on the queue is too big " 1243 "(want %zu, got %hu)\n", 1244 msgsz, msghdr->msg_ts)); 1245 error = E2BIG; 1246 goto done2; 1247 } 1248 #ifdef MAC 1249 error = mac_sysvmsq_check_msgrcv( 1250 td->td_ucred, msghdr); 1251 if (error != 0) 1252 goto done2; 1253 #endif 1254 *prev = msghdr->msg_next; 1255 if (msghdr == msqkptr->u.__msg_last) { 1256 if (previous == NULL) { 1257 if (prev != 1258 &msqkptr->u.__msg_first) 1259 panic("__msg_first/last screwed up #2"); 1260 msqkptr->u.__msg_first = 1261 NULL; 1262 msqkptr->u.__msg_last = 1263 NULL; 1264 } else { 1265 if (prev == 1266 &msqkptr->u.__msg_first) 1267 panic("__msg_first/last screwed up #3"); 1268 msqkptr->u.__msg_last = 1269 previous; 1270 } 1271 } 1272 break; 1273 } 1274 previous = msghdr; 1275 prev = &(msghdr->msg_next); 1276 } 1277 } 1278 1279 /* 1280 * We've either extracted the msghdr for the appropriate 1281 * message or there isn't one. 1282 * If there is one then bail out of this loop. 1283 */ 1284 1285 if (msghdr != NULL) 1286 break; 1287 1288 /* 1289 * Hmph! No message found. Does the user want to wait? 1290 */ 1291 1292 if ((msgflg & IPC_NOWAIT) != 0) { 1293 DPRINTF(("no appropriate message found (msgtyp=%ld)\n", 1294 msgtyp)); 1295 /* The SVID says to return ENOMSG. */ 1296 error = ENOMSG; 1297 goto done2; 1298 } 1299 1300 /* 1301 * Wait for something to happen 1302 */ 1303 1304 DPRINTF(("msgrcv: goodnight\n")); 1305 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH, 1306 "msgrcv", 0); 1307 DPRINTF(("msgrcv: good morning (error=%d)\n", error)); 1308 1309 if (error != 0) { 1310 DPRINTF(("msgrcv: interrupted system call\n")); 1311 error = EINTR; 1312 goto done2; 1313 } 1314 1315 /* 1316 * Make sure that the msq queue still exists 1317 */ 1318 1319 if (msqkptr->u.msg_qbytes == 0 || 1320 msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 1321 DPRINTF(("msqid deleted\n")); 1322 error = EIDRM; 1323 goto done2; 1324 } 1325 } 1326 1327 /* 1328 * Return the message to the user. 1329 * 1330 * First, do the bookkeeping (before we risk being interrupted). 1331 */ 1332 1333 msqkptr->u.msg_cbytes -= msghdr->msg_ts; 1334 msqkptr->u.msg_qnum--; 1335 msqkptr->u.msg_lrpid = td->td_proc->p_pid; 1336 msqkptr->u.msg_rtime = time_second; 1337 1338 racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, 1); 1339 racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msghdr->msg_ts); 1340 1341 /* 1342 * Make msgsz the actual amount that we'll be returning. 1343 * Note that this effectively truncates the message if it is too long 1344 * (since msgsz is never increased). 1345 */ 1346 1347 DPRINTF(("found a message, msgsz=%zu, msg_ts=%hu\n", msgsz, 1348 msghdr->msg_ts)); 1349 if (msgsz > msghdr->msg_ts) 1350 msgsz = msghdr->msg_ts; 1351 *mtype = msghdr->msg_type; 1352 1353 /* 1354 * Return the segments to the user 1355 */ 1356 1357 next = msghdr->msg_spot; 1358 for (len = 0; len < msgsz; len += msginfo.msgssz) { 1359 size_t tlen; 1360 1361 if (msgsz - len > msginfo.msgssz) 1362 tlen = msginfo.msgssz; 1363 else 1364 tlen = msgsz - len; 1365 if (next <= -1) 1366 panic("next too low #3"); 1367 if (next >= msginfo.msgseg) 1368 panic("next out of range #3"); 1369 mtx_unlock(&msq_mtx); 1370 error = copyout(&msgpool[next * msginfo.msgssz], msgp, tlen); 1371 mtx_lock(&msq_mtx); 1372 if (error != 0) { 1373 DPRINTF(("error (%d) copying out message segment\n", 1374 error)); 1375 msg_freehdr(msghdr); 1376 wakeup(msqkptr); 1377 goto done2; 1378 } 1379 msgp = (char *)msgp + tlen; 1380 next = msgmaps[next].next; 1381 } 1382 1383 /* 1384 * Done, return the actual number of bytes copied out. 1385 */ 1386 1387 msg_freehdr(msghdr); 1388 wakeup(msqkptr); 1389 td->td_retval[0] = msgsz; 1390 done2: 1391 mtx_unlock(&msq_mtx); 1392 return (error); 1393 } 1394 1395 int 1396 sys_msgrcv(struct thread *td, struct msgrcv_args *uap) 1397 { 1398 int error; 1399 long mtype; 1400 1401 DPRINTF(("call to msgrcv(%d, %p, %zu, %ld, %d)\n", uap->msqid, 1402 uap->msgp, uap->msgsz, uap->msgtyp, uap->msgflg)); 1403 1404 if ((error = kern_msgrcv(td, uap->msqid, 1405 (char *)uap->msgp + sizeof(mtype), uap->msgsz, 1406 uap->msgtyp, uap->msgflg, &mtype)) != 0) 1407 return (error); 1408 if ((error = copyout(&mtype, uap->msgp, sizeof(mtype))) != 0) 1409 DPRINTF(("error %d copying the message type\n", error)); 1410 return (error); 1411 } 1412 1413 static int 1414 sysctl_msqids(SYSCTL_HANDLER_ARGS) 1415 { 1416 struct msqid_kernel tmsqk; 1417 #ifdef COMPAT_FREEBSD32 1418 struct msqid_kernel32 tmsqk32; 1419 #endif 1420 struct prison *pr, *rpr; 1421 void *outaddr; 1422 size_t outsize; 1423 int error, i; 1424 1425 pr = req->td->td_ucred->cr_prison; 1426 rpr = msg_find_prison(req->td->td_ucred); 1427 error = 0; 1428 for (i = 0; i < msginfo.msgmni; i++) { 1429 mtx_lock(&msq_mtx); 1430 if (msqids[i].u.msg_qbytes == 0 || rpr == NULL || 1431 msq_prison_cansee(rpr, &msqids[i]) != 0) 1432 bzero(&tmsqk, sizeof(tmsqk)); 1433 else { 1434 tmsqk = msqids[i]; 1435 if (tmsqk.cred->cr_prison != pr) 1436 tmsqk.u.msg_perm.key = IPC_PRIVATE; 1437 } 1438 mtx_unlock(&msq_mtx); 1439 #ifdef COMPAT_FREEBSD32 1440 if (SV_CURPROC_FLAG(SV_ILP32)) { 1441 bzero(&tmsqk32, sizeof(tmsqk32)); 1442 freebsd32_ipcperm_out(&tmsqk.u.msg_perm, 1443 &tmsqk32.u.msg_perm); 1444 /* Don't copy u.msg_first or u.msg_last */ 1445 CP(tmsqk, tmsqk32, u.msg_cbytes); 1446 CP(tmsqk, tmsqk32, u.msg_qnum); 1447 CP(tmsqk, tmsqk32, u.msg_qbytes); 1448 CP(tmsqk, tmsqk32, u.msg_lspid); 1449 CP(tmsqk, tmsqk32, u.msg_lrpid); 1450 CP(tmsqk, tmsqk32, u.msg_stime); 1451 CP(tmsqk, tmsqk32, u.msg_rtime); 1452 CP(tmsqk, tmsqk32, u.msg_ctime); 1453 /* Don't copy label or cred */ 1454 outaddr = &tmsqk32; 1455 outsize = sizeof(tmsqk32); 1456 } else 1457 #endif 1458 { 1459 /* Don't leak kernel pointers */ 1460 tmsqk.u.__msg_first = NULL; 1461 tmsqk.u.__msg_last = NULL; 1462 tmsqk.label = NULL; 1463 tmsqk.cred = NULL; 1464 /* 1465 * XXX: some padding also exists, but we take care to 1466 * allocate our pool of msqid_kernel structs with 1467 * zeroed memory so this should be OK. 1468 */ 1469 outaddr = &tmsqk; 1470 outsize = sizeof(tmsqk); 1471 } 1472 error = SYSCTL_OUT(req, outaddr, outsize); 1473 if (error != 0) 1474 break; 1475 } 1476 return (error); 1477 } 1478 1479 int 1480 kern_get_msqids(struct thread *td, struct msqid_kernel **res, size_t *sz) 1481 { 1482 struct msqid_kernel *pmsqk; 1483 struct prison *pr, *rpr; 1484 int i, mi; 1485 1486 *sz = mi = msginfo.msgmni; 1487 if (res == NULL) 1488 return (0); 1489 1490 pr = td->td_ucred->cr_prison; 1491 rpr = msg_find_prison(td->td_ucred); 1492 *res = malloc(sizeof(struct msqid_kernel) * mi, M_TEMP, M_WAITOK); 1493 for (i = 0; i < mi; i++) { 1494 pmsqk = &(*res)[i]; 1495 mtx_lock(&msq_mtx); 1496 if (msqids[i].u.msg_qbytes == 0 || rpr == NULL || 1497 msq_prison_cansee(rpr, &msqids[i]) != 0) 1498 bzero(pmsqk, sizeof(*pmsqk)); 1499 else { 1500 *pmsqk = msqids[i]; 1501 if (pmsqk->cred->cr_prison != pr) 1502 pmsqk->u.msg_perm.key = IPC_PRIVATE; 1503 } 1504 mtx_unlock(&msq_mtx); 1505 pmsqk->u.__msg_first = NULL; 1506 pmsqk->u.__msg_last = NULL; 1507 pmsqk->label = NULL; 1508 pmsqk->cred = NULL; 1509 } 1510 return (0); 1511 } 1512 1513 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmax, CTLFLAG_RD, &msginfo.msgmax, 0, 1514 "Maximum message size"); 1515 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmni, CTLFLAG_RDTUN, &msginfo.msgmni, 0, 1516 "Number of message queue identifiers"); 1517 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmnb, CTLFLAG_RDTUN, &msginfo.msgmnb, 0, 1518 "Maximum number of bytes in a queue"); 1519 SYSCTL_INT(_kern_ipc, OID_AUTO, msgtql, CTLFLAG_RDTUN, &msginfo.msgtql, 0, 1520 "Maximum number of messages in the system"); 1521 SYSCTL_INT(_kern_ipc, OID_AUTO, msgssz, CTLFLAG_RDTUN, &msginfo.msgssz, 0, 1522 "Size of a message segment"); 1523 SYSCTL_INT(_kern_ipc, OID_AUTO, msgseg, CTLFLAG_RDTUN, &msginfo.msgseg, 0, 1524 "Number of message segments"); 1525 SYSCTL_PROC(_kern_ipc, OID_AUTO, msqids, 1526 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, 1527 NULL, 0, sysctl_msqids, "", 1528 "Array of struct msqid_kernel for each potential message queue"); 1529 1530 static int 1531 msg_prison_check(void *obj, void *data) 1532 { 1533 struct prison *pr = obj; 1534 struct prison *prpr; 1535 struct vfsoptlist *opts = data; 1536 int error, jsys; 1537 1538 /* 1539 * sysvmsg is a jailsys integer. 1540 * It must be "disable" if the parent jail is disabled. 1541 */ 1542 error = vfs_copyopt(opts, "sysvmsg", &jsys, sizeof(jsys)); 1543 if (error != ENOENT) { 1544 if (error != 0) 1545 return (error); 1546 switch (jsys) { 1547 case JAIL_SYS_DISABLE: 1548 break; 1549 case JAIL_SYS_NEW: 1550 case JAIL_SYS_INHERIT: 1551 prison_lock(pr->pr_parent); 1552 prpr = osd_jail_get(pr->pr_parent, msg_prison_slot); 1553 prison_unlock(pr->pr_parent); 1554 if (prpr == NULL) 1555 return (EPERM); 1556 break; 1557 default: 1558 return (EINVAL); 1559 } 1560 } 1561 1562 return (0); 1563 } 1564 1565 static int 1566 msg_prison_set(void *obj, void *data) 1567 { 1568 struct prison *pr = obj; 1569 struct prison *tpr, *orpr, *nrpr, *trpr; 1570 struct vfsoptlist *opts = data; 1571 void *rsv; 1572 int jsys, descend; 1573 1574 /* 1575 * sysvmsg controls which jail is the root of the associated msgs (this 1576 * jail or same as the parent), or if the feature is available at all. 1577 */ 1578 if (vfs_copyopt(opts, "sysvmsg", &jsys, sizeof(jsys)) == ENOENT) 1579 jsys = vfs_flagopt(opts, "allow.sysvipc", NULL, 0) 1580 ? JAIL_SYS_INHERIT 1581 : vfs_flagopt(opts, "allow.nosysvipc", NULL, 0) 1582 ? JAIL_SYS_DISABLE 1583 : -1; 1584 if (jsys == JAIL_SYS_DISABLE) { 1585 prison_lock(pr); 1586 orpr = osd_jail_get(pr, msg_prison_slot); 1587 if (orpr != NULL) 1588 osd_jail_del(pr, msg_prison_slot); 1589 prison_unlock(pr); 1590 if (orpr != NULL) { 1591 if (orpr == pr) 1592 msg_prison_cleanup(pr); 1593 /* Disable all child jails as well. */ 1594 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1595 prison_lock(tpr); 1596 trpr = osd_jail_get(tpr, msg_prison_slot); 1597 if (trpr != NULL) { 1598 osd_jail_del(tpr, msg_prison_slot); 1599 prison_unlock(tpr); 1600 if (trpr == tpr) 1601 msg_prison_cleanup(tpr); 1602 } else { 1603 prison_unlock(tpr); 1604 descend = 0; 1605 } 1606 } 1607 } 1608 } else if (jsys != -1) { 1609 if (jsys == JAIL_SYS_NEW) 1610 nrpr = pr; 1611 else { 1612 prison_lock(pr->pr_parent); 1613 nrpr = osd_jail_get(pr->pr_parent, msg_prison_slot); 1614 prison_unlock(pr->pr_parent); 1615 } 1616 rsv = osd_reserve(msg_prison_slot); 1617 prison_lock(pr); 1618 orpr = osd_jail_get(pr, msg_prison_slot); 1619 if (orpr != nrpr) 1620 (void)osd_jail_set_reserved(pr, msg_prison_slot, rsv, 1621 nrpr); 1622 else 1623 osd_free_reserved(rsv); 1624 prison_unlock(pr); 1625 if (orpr != nrpr) { 1626 if (orpr == pr) 1627 msg_prison_cleanup(pr); 1628 if (orpr != NULL) { 1629 /* Change child jails matching the old root, */ 1630 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1631 prison_lock(tpr); 1632 trpr = osd_jail_get(tpr, 1633 msg_prison_slot); 1634 if (trpr == orpr) { 1635 (void)osd_jail_set(tpr, 1636 msg_prison_slot, nrpr); 1637 prison_unlock(tpr); 1638 if (trpr == tpr) 1639 msg_prison_cleanup(tpr); 1640 } else { 1641 prison_unlock(tpr); 1642 descend = 0; 1643 } 1644 } 1645 } 1646 } 1647 } 1648 1649 return (0); 1650 } 1651 1652 static int 1653 msg_prison_get(void *obj, void *data) 1654 { 1655 struct prison *pr = obj; 1656 struct prison *rpr; 1657 struct vfsoptlist *opts = data; 1658 int error, jsys; 1659 1660 /* Set sysvmsg based on the jail's root prison. */ 1661 prison_lock(pr); 1662 rpr = osd_jail_get(pr, msg_prison_slot); 1663 prison_unlock(pr); 1664 jsys = rpr == NULL ? JAIL_SYS_DISABLE 1665 : rpr == pr ? JAIL_SYS_NEW : JAIL_SYS_INHERIT; 1666 error = vfs_setopt(opts, "sysvmsg", &jsys, sizeof(jsys)); 1667 if (error == ENOENT) 1668 error = 0; 1669 return (error); 1670 } 1671 1672 static int 1673 msg_prison_remove(void *obj, void *data __unused) 1674 { 1675 struct prison *pr = obj; 1676 struct prison *rpr; 1677 1678 prison_lock(pr); 1679 rpr = osd_jail_get(pr, msg_prison_slot); 1680 prison_unlock(pr); 1681 if (rpr == pr) 1682 msg_prison_cleanup(pr); 1683 return (0); 1684 } 1685 1686 static void 1687 msg_prison_cleanup(struct prison *pr) 1688 { 1689 struct msqid_kernel *msqkptr; 1690 int i; 1691 1692 /* Remove any msqs that belong to this jail. */ 1693 mtx_lock(&msq_mtx); 1694 for (i = 0; i < msginfo.msgmni; i++) { 1695 msqkptr = &msqids[i]; 1696 if (msqkptr->u.msg_qbytes != 0 && 1697 msqkptr->cred != NULL && msqkptr->cred->cr_prison == pr) 1698 msq_remove(msqkptr); 1699 } 1700 mtx_unlock(&msq_mtx); 1701 } 1702 1703 SYSCTL_JAIL_PARAM_SYS_NODE(sysvmsg, CTLFLAG_RW, "SYSV message queues"); 1704 1705 #ifdef COMPAT_FREEBSD32 1706 int 1707 freebsd32_msgsys(struct thread *td, struct freebsd32_msgsys_args *uap) 1708 { 1709 1710 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1711 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1712 AUDIT_ARG_SVIPC_WHICH(uap->which); 1713 switch (uap->which) { 1714 case 0: 1715 return (freebsd7_freebsd32_msgctl(td, 1716 (struct freebsd7_freebsd32_msgctl_args *)&uap->a2)); 1717 case 2: 1718 return (freebsd32_msgsnd(td, 1719 (struct freebsd32_msgsnd_args *)&uap->a2)); 1720 case 3: 1721 return (freebsd32_msgrcv(td, 1722 (struct freebsd32_msgrcv_args *)&uap->a2)); 1723 default: 1724 return (sys_msgsys(td, (struct msgsys_args *)uap)); 1725 } 1726 #else 1727 return (nosys(td, NULL)); 1728 #endif 1729 } 1730 1731 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1732 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1733 int 1734 freebsd7_freebsd32_msgctl(struct thread *td, 1735 struct freebsd7_freebsd32_msgctl_args *uap) 1736 { 1737 struct msqid_ds msqbuf; 1738 struct msqid_ds_old32 msqbuf32; 1739 int error; 1740 1741 if (uap->cmd == IPC_SET) { 1742 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32)); 1743 if (error) 1744 return (error); 1745 freebsd32_ipcperm_old_in(&msqbuf32.msg_perm, &msqbuf.msg_perm); 1746 PTRIN_CP(msqbuf32, msqbuf, __msg_first); 1747 PTRIN_CP(msqbuf32, msqbuf, __msg_last); 1748 CP(msqbuf32, msqbuf, msg_cbytes); 1749 CP(msqbuf32, msqbuf, msg_qnum); 1750 CP(msqbuf32, msqbuf, msg_qbytes); 1751 CP(msqbuf32, msqbuf, msg_lspid); 1752 CP(msqbuf32, msqbuf, msg_lrpid); 1753 CP(msqbuf32, msqbuf, msg_stime); 1754 CP(msqbuf32, msqbuf, msg_rtime); 1755 CP(msqbuf32, msqbuf, msg_ctime); 1756 } 1757 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1758 if (error) 1759 return (error); 1760 if (uap->cmd == IPC_STAT) { 1761 bzero(&msqbuf32, sizeof(msqbuf32)); 1762 freebsd32_ipcperm_old_out(&msqbuf.msg_perm, &msqbuf32.msg_perm); 1763 PTROUT_CP(msqbuf, msqbuf32, __msg_first); 1764 PTROUT_CP(msqbuf, msqbuf32, __msg_last); 1765 CP(msqbuf, msqbuf32, msg_cbytes); 1766 CP(msqbuf, msqbuf32, msg_qnum); 1767 CP(msqbuf, msqbuf32, msg_qbytes); 1768 CP(msqbuf, msqbuf32, msg_lspid); 1769 CP(msqbuf, msqbuf32, msg_lrpid); 1770 CP(msqbuf, msqbuf32, msg_stime); 1771 CP(msqbuf, msqbuf32, msg_rtime); 1772 CP(msqbuf, msqbuf32, msg_ctime); 1773 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32)); 1774 } 1775 return (error); 1776 } 1777 #endif 1778 1779 int 1780 freebsd32_msgctl(struct thread *td, struct freebsd32_msgctl_args *uap) 1781 { 1782 struct msqid_ds msqbuf; 1783 struct msqid_ds32 msqbuf32; 1784 int error; 1785 1786 if (uap->cmd == IPC_SET) { 1787 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32)); 1788 if (error) 1789 return (error); 1790 freebsd32_ipcperm_in(&msqbuf32.msg_perm, &msqbuf.msg_perm); 1791 PTRIN_CP(msqbuf32, msqbuf, __msg_first); 1792 PTRIN_CP(msqbuf32, msqbuf, __msg_last); 1793 CP(msqbuf32, msqbuf, msg_cbytes); 1794 CP(msqbuf32, msqbuf, msg_qnum); 1795 CP(msqbuf32, msqbuf, msg_qbytes); 1796 CP(msqbuf32, msqbuf, msg_lspid); 1797 CP(msqbuf32, msqbuf, msg_lrpid); 1798 CP(msqbuf32, msqbuf, msg_stime); 1799 CP(msqbuf32, msqbuf, msg_rtime); 1800 CP(msqbuf32, msqbuf, msg_ctime); 1801 } 1802 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1803 if (error) 1804 return (error); 1805 if (uap->cmd == IPC_STAT) { 1806 freebsd32_ipcperm_out(&msqbuf.msg_perm, &msqbuf32.msg_perm); 1807 PTROUT_CP(msqbuf, msqbuf32, __msg_first); 1808 PTROUT_CP(msqbuf, msqbuf32, __msg_last); 1809 CP(msqbuf, msqbuf32, msg_cbytes); 1810 CP(msqbuf, msqbuf32, msg_qnum); 1811 CP(msqbuf, msqbuf32, msg_qbytes); 1812 CP(msqbuf, msqbuf32, msg_lspid); 1813 CP(msqbuf, msqbuf32, msg_lrpid); 1814 CP(msqbuf, msqbuf32, msg_stime); 1815 CP(msqbuf, msqbuf32, msg_rtime); 1816 CP(msqbuf, msqbuf32, msg_ctime); 1817 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32)); 1818 } 1819 return (error); 1820 } 1821 1822 int 1823 freebsd32_msgsnd(struct thread *td, struct freebsd32_msgsnd_args *uap) 1824 { 1825 const void *msgp; 1826 long mtype; 1827 int32_t mtype32; 1828 int error; 1829 1830 msgp = PTRIN(uap->msgp); 1831 if ((error = copyin(msgp, &mtype32, sizeof(mtype32))) != 0) 1832 return (error); 1833 mtype = mtype32; 1834 return (kern_msgsnd(td, uap->msqid, 1835 (const char *)msgp + sizeof(mtype32), 1836 uap->msgsz, uap->msgflg, mtype)); 1837 } 1838 1839 int 1840 freebsd32_msgrcv(struct thread *td, struct freebsd32_msgrcv_args *uap) 1841 { 1842 void *msgp; 1843 long mtype; 1844 int32_t mtype32; 1845 int error; 1846 1847 msgp = PTRIN(uap->msgp); 1848 if ((error = kern_msgrcv(td, uap->msqid, 1849 (char *)msgp + sizeof(mtype32), uap->msgsz, 1850 uap->msgtyp, uap->msgflg, &mtype)) != 0) 1851 return (error); 1852 mtype32 = (int32_t)mtype; 1853 return (copyout(&mtype32, msgp, sizeof(mtype32))); 1854 } 1855 #endif 1856 1857 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1858 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1859 1860 /* XXX casting to (sy_call_t *) is bogus, as usual. */ 1861 static sy_call_t *msgcalls[] = { 1862 (sy_call_t *)freebsd7_msgctl, (sy_call_t *)sys_msgget, 1863 (sy_call_t *)sys_msgsnd, (sy_call_t *)sys_msgrcv 1864 }; 1865 1866 /* 1867 * Entry point for all MSG calls. 1868 * 1869 * XXX actually varargs. 1870 * struct msgsys_args { 1871 * int which; 1872 * int a2; 1873 * int a3; 1874 * int a4; 1875 * int a5; 1876 * int a6; 1877 * } *uap; 1878 */ 1879 int 1880 sys_msgsys(struct thread *td, struct msgsys_args *uap) 1881 { 1882 int error; 1883 1884 AUDIT_ARG_SVIPC_WHICH(uap->which); 1885 if (uap->which < 0 || uap->which >= nitems(msgcalls)) 1886 return (EINVAL); 1887 error = (*msgcalls[uap->which])(td, &uap->a2); 1888 return (error); 1889 } 1890 1891 #ifndef CP 1892 #define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0) 1893 #endif 1894 1895 #ifndef _SYS_SYSPROTO_H_ 1896 struct freebsd7_msgctl_args { 1897 int msqid; 1898 int cmd; 1899 struct msqid_ds_old *buf; 1900 }; 1901 #endif 1902 int 1903 freebsd7_msgctl(struct thread *td, struct freebsd7_msgctl_args *uap) 1904 { 1905 struct msqid_ds_old msqold; 1906 struct msqid_ds msqbuf; 1907 int error; 1908 1909 DPRINTF(("call to freebsd7_msgctl(%d, %d, %p)\n", uap->msqid, uap->cmd, 1910 uap->buf)); 1911 if (uap->cmd == IPC_SET) { 1912 error = copyin(uap->buf, &msqold, sizeof(msqold)); 1913 if (error) 1914 return (error); 1915 ipcperm_old2new(&msqold.msg_perm, &msqbuf.msg_perm); 1916 CP(msqold, msqbuf, __msg_first); 1917 CP(msqold, msqbuf, __msg_last); 1918 CP(msqold, msqbuf, msg_cbytes); 1919 CP(msqold, msqbuf, msg_qnum); 1920 CP(msqold, msqbuf, msg_qbytes); 1921 CP(msqold, msqbuf, msg_lspid); 1922 CP(msqold, msqbuf, msg_lrpid); 1923 CP(msqold, msqbuf, msg_stime); 1924 CP(msqold, msqbuf, msg_rtime); 1925 CP(msqold, msqbuf, msg_ctime); 1926 } 1927 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1928 if (error) 1929 return (error); 1930 if (uap->cmd == IPC_STAT) { 1931 bzero(&msqold, sizeof(msqold)); 1932 ipcperm_new2old(&msqbuf.msg_perm, &msqold.msg_perm); 1933 CP(msqbuf, msqold, __msg_first); 1934 CP(msqbuf, msqold, __msg_last); 1935 CP(msqbuf, msqold, msg_cbytes); 1936 CP(msqbuf, msqold, msg_qnum); 1937 CP(msqbuf, msqold, msg_qbytes); 1938 CP(msqbuf, msqold, msg_lspid); 1939 CP(msqbuf, msqold, msg_lrpid); 1940 CP(msqbuf, msqold, msg_stime); 1941 CP(msqbuf, msqold, msg_rtime); 1942 CP(msqbuf, msqold, msg_ctime); 1943 error = copyout(&msqold, uap->buf, sizeof(struct msqid_ds_old)); 1944 } 1945 return (error); 1946 } 1947 1948 #undef CP 1949 1950 #endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 || 1951 COMPAT_FREEBSD7 */ 1952