1 /*- 2 * Implementation of SVID messages 3 * 4 * Author: Daniel Boulet 5 * 6 * Copyright 1993 Daniel Boulet and RTMX Inc. 7 * 8 * This system call was implemented by Daniel Boulet under contract from RTMX. 9 * 10 * Redistribution and use in source forms, with and without modification, 11 * are permitted provided that this entire comment appears intact. 12 * 13 * Redistribution in binary form may occur without any restrictions. 14 * Obviously, it would be nice if you gave credit where credit is due 15 * but requiring it would be too onerous. 16 * 17 * This software is provided ``AS IS'' without any warranties of any kind. 18 */ 19 /*- 20 * Copyright (c) 2003-2005 McAfee, Inc. 21 * All rights reserved. 22 * 23 * This software was developed for the FreeBSD Project in part by McAfee 24 * Research, the Security Research Division of McAfee, Inc under DARPA/SPAWAR 25 * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS research 26 * program. 27 * 28 * Redistribution and use in source and binary forms, with or without 29 * modification, are permitted provided that the following conditions 30 * are met: 31 * 1. Redistributions of source code must retain the above copyright 32 * notice, this list of conditions and the following disclaimer. 33 * 2. Redistributions in binary form must reproduce the above copyright 34 * notice, this list of conditions and the following disclaimer in the 35 * documentation and/or other materials provided with the distribution. 36 * 37 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 38 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 39 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 40 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 41 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 42 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 43 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 45 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 46 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 47 * SUCH DAMAGE. 48 */ 49 50 #include <sys/cdefs.h> 51 __FBSDID("$FreeBSD$"); 52 53 #include "opt_compat.h" 54 #include "opt_sysvipc.h" 55 56 #include <sys/param.h> 57 #include <sys/systm.h> 58 #include <sys/sysproto.h> 59 #include <sys/kernel.h> 60 #include <sys/priv.h> 61 #include <sys/proc.h> 62 #include <sys/lock.h> 63 #include <sys/mutex.h> 64 #include <sys/module.h> 65 #include <sys/msg.h> 66 #include <sys/racct.h> 67 #include <sys/syscall.h> 68 #include <sys/syscallsubr.h> 69 #include <sys/sysent.h> 70 #include <sys/sysctl.h> 71 #include <sys/malloc.h> 72 #include <sys/jail.h> 73 74 #include <security/mac/mac_framework.h> 75 76 FEATURE(sysv_msg, "System V message queues support"); 77 78 static MALLOC_DEFINE(M_MSG, "msg", "SVID compatible message queues"); 79 80 static int msginit(void); 81 static int msgunload(void); 82 static int sysvmsg_modload(struct module *, int, void *); 83 84 #ifdef MSG_DEBUG 85 #define DPRINTF(a) printf a 86 #else 87 #define DPRINTF(a) (void)0 88 #endif 89 90 static void msg_freehdr(struct msg *msghdr); 91 92 #ifndef MSGSSZ 93 #define MSGSSZ 8 /* Each segment must be 2^N long */ 94 #endif 95 #ifndef MSGSEG 96 #define MSGSEG 2048 /* must be less than 32767 */ 97 #endif 98 #define MSGMAX (MSGSSZ*MSGSEG) 99 #ifndef MSGMNB 100 #define MSGMNB 2048 /* max # of bytes in a queue */ 101 #endif 102 #ifndef MSGMNI 103 #define MSGMNI 40 104 #endif 105 #ifndef MSGTQL 106 #define MSGTQL 40 107 #endif 108 109 /* 110 * Based on the configuration parameters described in an SVR2 (yes, two) 111 * config(1m) man page. 112 * 113 * Each message is broken up and stored in segments that are msgssz bytes 114 * long. For efficiency reasons, this should be a power of two. Also, 115 * it doesn't make sense if it is less than 8 or greater than about 256. 116 * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of 117 * two between 8 and 1024 inclusive (and panic's if it isn't). 118 */ 119 struct msginfo msginfo = { 120 MSGMAX, /* max chars in a message */ 121 MSGMNI, /* # of message queue identifiers */ 122 MSGMNB, /* max chars in a queue */ 123 MSGTQL, /* max messages in system */ 124 MSGSSZ, /* size of a message segment */ 125 /* (must be small power of 2 greater than 4) */ 126 MSGSEG /* number of message segments */ 127 }; 128 129 /* 130 * macros to convert between msqid_ds's and msqid's. 131 * (specific to this implementation) 132 */ 133 #define MSQID(ix,ds) ((ix) & 0xffff | (((ds).msg_perm.seq << 16) & 0xffff0000)) 134 #define MSQID_IX(id) ((id) & 0xffff) 135 #define MSQID_SEQ(id) (((id) >> 16) & 0xffff) 136 137 /* 138 * The rest of this file is specific to this particular implementation. 139 */ 140 141 struct msgmap { 142 short next; /* next segment in buffer */ 143 /* -1 -> available */ 144 /* 0..(MSGSEG-1) -> index of next segment */ 145 }; 146 147 #define MSG_LOCKED 01000 /* Is this msqid_ds locked? */ 148 149 static int nfree_msgmaps; /* # of free map entries */ 150 static short free_msgmaps; /* head of linked list of free map entries */ 151 static struct msg *free_msghdrs;/* list of free msg headers */ 152 static char *msgpool; /* MSGMAX byte long msg buffer pool */ 153 static struct msgmap *msgmaps; /* MSGSEG msgmap structures */ 154 static struct msg *msghdrs; /* MSGTQL msg headers */ 155 static struct msqid_kernel *msqids; /* MSGMNI msqid_kernel struct's */ 156 static struct mtx msq_mtx; /* global mutex for message queues. */ 157 158 static struct syscall_helper_data msg_syscalls[] = { 159 SYSCALL_INIT_HELPER(msgctl), 160 SYSCALL_INIT_HELPER(msgget), 161 SYSCALL_INIT_HELPER(msgsnd), 162 SYSCALL_INIT_HELPER(msgrcv), 163 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 164 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 165 SYSCALL_INIT_HELPER(msgsys), 166 SYSCALL_INIT_HELPER(freebsd7_msgctl), 167 #endif 168 SYSCALL_INIT_LAST 169 }; 170 171 #ifdef COMPAT_FREEBSD32 172 #include <compat/freebsd32/freebsd32.h> 173 #include <compat/freebsd32/freebsd32_ipc.h> 174 #include <compat/freebsd32/freebsd32_proto.h> 175 #include <compat/freebsd32/freebsd32_signal.h> 176 #include <compat/freebsd32/freebsd32_syscall.h> 177 #include <compat/freebsd32/freebsd32_util.h> 178 179 static struct syscall_helper_data msg32_syscalls[] = { 180 SYSCALL32_INIT_HELPER(freebsd32_msgctl), 181 SYSCALL32_INIT_HELPER(freebsd32_msgsnd), 182 SYSCALL32_INIT_HELPER(freebsd32_msgrcv), 183 SYSCALL32_INIT_HELPER(msgget), 184 SYSCALL32_INIT_HELPER(freebsd32_msgsys), 185 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 186 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 187 SYSCALL32_INIT_HELPER(freebsd7_freebsd32_msgctl), 188 #endif 189 SYSCALL_INIT_LAST 190 }; 191 #endif 192 193 static int 194 msginit() 195 { 196 int i, error; 197 198 TUNABLE_INT_FETCH("kern.ipc.msgseg", &msginfo.msgseg); 199 TUNABLE_INT_FETCH("kern.ipc.msgssz", &msginfo.msgssz); 200 msginfo.msgmax = msginfo.msgseg * msginfo.msgssz; 201 TUNABLE_INT_FETCH("kern.ipc.msgmni", &msginfo.msgmni); 202 TUNABLE_INT_FETCH("kern.ipc.msgmnb", &msginfo.msgmnb); 203 TUNABLE_INT_FETCH("kern.ipc.msgtql", &msginfo.msgtql); 204 205 msgpool = malloc(msginfo.msgmax, M_MSG, M_WAITOK); 206 msgmaps = malloc(sizeof(struct msgmap) * msginfo.msgseg, M_MSG, M_WAITOK); 207 msghdrs = malloc(sizeof(struct msg) * msginfo.msgtql, M_MSG, M_WAITOK); 208 msqids = malloc(sizeof(struct msqid_kernel) * msginfo.msgmni, M_MSG, 209 M_WAITOK); 210 211 /* 212 * msginfo.msgssz should be a power of two for efficiency reasons. 213 * It is also pretty silly if msginfo.msgssz is less than 8 214 * or greater than about 256 so ... 215 */ 216 217 i = 8; 218 while (i < 1024 && i != msginfo.msgssz) 219 i <<= 1; 220 if (i != msginfo.msgssz) { 221 DPRINTF(("msginfo.msgssz=%d (0x%x)\n", msginfo.msgssz, 222 msginfo.msgssz)); 223 panic("msginfo.msgssz not a small power of 2"); 224 } 225 226 if (msginfo.msgseg > 32767) { 227 DPRINTF(("msginfo.msgseg=%d\n", msginfo.msgseg)); 228 panic("msginfo.msgseg > 32767"); 229 } 230 231 for (i = 0; i < msginfo.msgseg; i++) { 232 if (i > 0) 233 msgmaps[i-1].next = i; 234 msgmaps[i].next = -1; /* implies entry is available */ 235 } 236 free_msgmaps = 0; 237 nfree_msgmaps = msginfo.msgseg; 238 239 for (i = 0; i < msginfo.msgtql; i++) { 240 msghdrs[i].msg_type = 0; 241 if (i > 0) 242 msghdrs[i-1].msg_next = &msghdrs[i]; 243 msghdrs[i].msg_next = NULL; 244 #ifdef MAC 245 mac_sysvmsg_init(&msghdrs[i]); 246 #endif 247 } 248 free_msghdrs = &msghdrs[0]; 249 250 for (i = 0; i < msginfo.msgmni; i++) { 251 msqids[i].u.msg_qbytes = 0; /* implies entry is available */ 252 msqids[i].u.msg_perm.seq = 0; /* reset to a known value */ 253 msqids[i].u.msg_perm.mode = 0; 254 #ifdef MAC 255 mac_sysvmsq_init(&msqids[i]); 256 #endif 257 } 258 mtx_init(&msq_mtx, "msq", NULL, MTX_DEF); 259 260 error = syscall_helper_register(msg_syscalls); 261 if (error != 0) 262 return (error); 263 #ifdef COMPAT_FREEBSD32 264 error = syscall32_helper_register(msg32_syscalls); 265 if (error != 0) 266 return (error); 267 #endif 268 return (0); 269 } 270 271 static int 272 msgunload() 273 { 274 struct msqid_kernel *msqkptr; 275 int msqid; 276 #ifdef MAC 277 int i; 278 #endif 279 280 syscall_helper_unregister(msg_syscalls); 281 #ifdef COMPAT_FREEBSD32 282 syscall32_helper_unregister(msg32_syscalls); 283 #endif 284 285 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 286 /* 287 * Look for an unallocated and unlocked msqid_ds. 288 * msqid_ds's can be locked by msgsnd or msgrcv while 289 * they are copying the message in/out. We can't 290 * re-use the entry until they release it. 291 */ 292 msqkptr = &msqids[msqid]; 293 if (msqkptr->u.msg_qbytes != 0 || 294 (msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) 295 break; 296 } 297 if (msqid != msginfo.msgmni) 298 return (EBUSY); 299 300 #ifdef MAC 301 for (i = 0; i < msginfo.msgtql; i++) 302 mac_sysvmsg_destroy(&msghdrs[i]); 303 for (msqid = 0; msqid < msginfo.msgmni; msqid++) 304 mac_sysvmsq_destroy(&msqids[msqid]); 305 #endif 306 free(msgpool, M_MSG); 307 free(msgmaps, M_MSG); 308 free(msghdrs, M_MSG); 309 free(msqids, M_MSG); 310 mtx_destroy(&msq_mtx); 311 return (0); 312 } 313 314 315 static int 316 sysvmsg_modload(struct module *module, int cmd, void *arg) 317 { 318 int error = 0; 319 320 switch (cmd) { 321 case MOD_LOAD: 322 error = msginit(); 323 if (error != 0) 324 msgunload(); 325 break; 326 case MOD_UNLOAD: 327 error = msgunload(); 328 break; 329 case MOD_SHUTDOWN: 330 break; 331 default: 332 error = EINVAL; 333 break; 334 } 335 return (error); 336 } 337 338 static moduledata_t sysvmsg_mod = { 339 "sysvmsg", 340 &sysvmsg_modload, 341 NULL 342 }; 343 344 DECLARE_MODULE(sysvmsg, sysvmsg_mod, SI_SUB_SYSV_MSG, SI_ORDER_FIRST); 345 MODULE_VERSION(sysvmsg, 1); 346 347 static void 348 msg_freehdr(msghdr) 349 struct msg *msghdr; 350 { 351 while (msghdr->msg_ts > 0) { 352 short next; 353 if (msghdr->msg_spot < 0 || msghdr->msg_spot >= msginfo.msgseg) 354 panic("msghdr->msg_spot out of range"); 355 next = msgmaps[msghdr->msg_spot].next; 356 msgmaps[msghdr->msg_spot].next = free_msgmaps; 357 free_msgmaps = msghdr->msg_spot; 358 nfree_msgmaps++; 359 msghdr->msg_spot = next; 360 if (msghdr->msg_ts >= msginfo.msgssz) 361 msghdr->msg_ts -= msginfo.msgssz; 362 else 363 msghdr->msg_ts = 0; 364 } 365 if (msghdr->msg_spot != -1) 366 panic("msghdr->msg_spot != -1"); 367 msghdr->msg_next = free_msghdrs; 368 free_msghdrs = msghdr; 369 #ifdef MAC 370 mac_sysvmsg_cleanup(msghdr); 371 #endif 372 } 373 374 #ifndef _SYS_SYSPROTO_H_ 375 struct msgctl_args { 376 int msqid; 377 int cmd; 378 struct msqid_ds *buf; 379 }; 380 #endif 381 int 382 msgctl(td, uap) 383 struct thread *td; 384 register struct msgctl_args *uap; 385 { 386 int msqid = uap->msqid; 387 int cmd = uap->cmd; 388 struct msqid_ds msqbuf; 389 int error; 390 391 DPRINTF(("call to msgctl(%d, %d, %p)\n", msqid, cmd, uap->buf)); 392 if (cmd == IPC_SET && 393 (error = copyin(uap->buf, &msqbuf, sizeof(msqbuf))) != 0) 394 return (error); 395 error = kern_msgctl(td, msqid, cmd, &msqbuf); 396 if (cmd == IPC_STAT && error == 0) 397 error = copyout(&msqbuf, uap->buf, sizeof(struct msqid_ds)); 398 return (error); 399 } 400 401 int 402 kern_msgctl(td, msqid, cmd, msqbuf) 403 struct thread *td; 404 int msqid; 405 int cmd; 406 struct msqid_ds *msqbuf; 407 { 408 int rval, error, msqix; 409 register struct msqid_kernel *msqkptr; 410 411 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 412 return (ENOSYS); 413 414 msqix = IPCID_TO_IX(msqid); 415 416 if (msqix < 0 || msqix >= msginfo.msgmni) { 417 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 418 msginfo.msgmni)); 419 return (EINVAL); 420 } 421 422 msqkptr = &msqids[msqix]; 423 424 mtx_lock(&msq_mtx); 425 if (msqkptr->u.msg_qbytes == 0) { 426 DPRINTF(("no such msqid\n")); 427 error = EINVAL; 428 goto done2; 429 } 430 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 431 DPRINTF(("wrong sequence number\n")); 432 error = EINVAL; 433 goto done2; 434 } 435 #ifdef MAC 436 error = mac_sysvmsq_check_msqctl(td->td_ucred, msqkptr, cmd); 437 if (error != 0) 438 goto done2; 439 #endif 440 441 error = 0; 442 rval = 0; 443 444 switch (cmd) { 445 446 case IPC_RMID: 447 { 448 struct msg *msghdr; 449 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M))) 450 goto done2; 451 452 #ifdef MAC 453 /* 454 * Check that the thread has MAC access permissions to 455 * individual msghdrs. Note: We need to do this in a 456 * separate loop because the actual loop alters the 457 * msq/msghdr info as it progresses, and there is no going 458 * back if half the way through we discover that the 459 * thread cannot free a certain msghdr. The msq will get 460 * into an inconsistent state. 461 */ 462 for (msghdr = msqkptr->u.msg_first; msghdr != NULL; 463 msghdr = msghdr->msg_next) { 464 error = mac_sysvmsq_check_msgrmid(td->td_ucred, msghdr); 465 if (error != 0) 466 goto done2; 467 } 468 #endif 469 470 racct_sub_cred(msqkptr->cred, RACCT_NMSGQ, 1); 471 racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, msqkptr->u.msg_qnum); 472 racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msqkptr->u.msg_cbytes); 473 crfree(msqkptr->cred); 474 msqkptr->cred = NULL; 475 476 /* Free the message headers */ 477 msghdr = msqkptr->u.msg_first; 478 while (msghdr != NULL) { 479 struct msg *msghdr_tmp; 480 481 /* Free the segments of each message */ 482 msqkptr->u.msg_cbytes -= msghdr->msg_ts; 483 msqkptr->u.msg_qnum--; 484 msghdr_tmp = msghdr; 485 msghdr = msghdr->msg_next; 486 msg_freehdr(msghdr_tmp); 487 } 488 489 if (msqkptr->u.msg_cbytes != 0) 490 panic("msg_cbytes is screwed up"); 491 if (msqkptr->u.msg_qnum != 0) 492 panic("msg_qnum is screwed up"); 493 494 msqkptr->u.msg_qbytes = 0; /* Mark it as free */ 495 496 #ifdef MAC 497 mac_sysvmsq_cleanup(msqkptr); 498 #endif 499 500 wakeup(msqkptr); 501 } 502 503 break; 504 505 case IPC_SET: 506 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M))) 507 goto done2; 508 if (msqbuf->msg_qbytes > msqkptr->u.msg_qbytes) { 509 error = priv_check(td, PRIV_IPC_MSGSIZE); 510 if (error) 511 goto done2; 512 } 513 if (msqbuf->msg_qbytes > msginfo.msgmnb) { 514 DPRINTF(("can't increase msg_qbytes beyond %d" 515 "(truncating)\n", msginfo.msgmnb)); 516 msqbuf->msg_qbytes = msginfo.msgmnb; /* silently restrict qbytes to system limit */ 517 } 518 if (msqbuf->msg_qbytes == 0) { 519 DPRINTF(("can't reduce msg_qbytes to 0\n")); 520 error = EINVAL; /* non-standard errno! */ 521 goto done2; 522 } 523 msqkptr->u.msg_perm.uid = msqbuf->msg_perm.uid; /* change the owner */ 524 msqkptr->u.msg_perm.gid = msqbuf->msg_perm.gid; /* change the owner */ 525 msqkptr->u.msg_perm.mode = (msqkptr->u.msg_perm.mode & ~0777) | 526 (msqbuf->msg_perm.mode & 0777); 527 msqkptr->u.msg_qbytes = msqbuf->msg_qbytes; 528 msqkptr->u.msg_ctime = time_second; 529 break; 530 531 case IPC_STAT: 532 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) { 533 DPRINTF(("requester doesn't have read access\n")); 534 goto done2; 535 } 536 *msqbuf = msqkptr->u; 537 break; 538 539 default: 540 DPRINTF(("invalid command %d\n", cmd)); 541 error = EINVAL; 542 goto done2; 543 } 544 545 if (error == 0) 546 td->td_retval[0] = rval; 547 done2: 548 mtx_unlock(&msq_mtx); 549 return (error); 550 } 551 552 #ifndef _SYS_SYSPROTO_H_ 553 struct msgget_args { 554 key_t key; 555 int msgflg; 556 }; 557 #endif 558 int 559 msgget(td, uap) 560 struct thread *td; 561 register struct msgget_args *uap; 562 { 563 int msqid, error = 0; 564 int key = uap->key; 565 int msgflg = uap->msgflg; 566 struct ucred *cred = td->td_ucred; 567 register struct msqid_kernel *msqkptr = NULL; 568 569 DPRINTF(("msgget(0x%x, 0%o)\n", key, msgflg)); 570 571 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 572 return (ENOSYS); 573 574 mtx_lock(&msq_mtx); 575 if (key != IPC_PRIVATE) { 576 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 577 msqkptr = &msqids[msqid]; 578 if (msqkptr->u.msg_qbytes != 0 && 579 msqkptr->u.msg_perm.key == key) 580 break; 581 } 582 if (msqid < msginfo.msgmni) { 583 DPRINTF(("found public key\n")); 584 if ((msgflg & IPC_CREAT) && (msgflg & IPC_EXCL)) { 585 DPRINTF(("not exclusive\n")); 586 error = EEXIST; 587 goto done2; 588 } 589 if ((error = ipcperm(td, &msqkptr->u.msg_perm, 590 msgflg & 0700))) { 591 DPRINTF(("requester doesn't have 0%o access\n", 592 msgflg & 0700)); 593 goto done2; 594 } 595 #ifdef MAC 596 error = mac_sysvmsq_check_msqget(cred, msqkptr); 597 if (error != 0) 598 goto done2; 599 #endif 600 goto found; 601 } 602 } 603 604 DPRINTF(("need to allocate the msqid_ds\n")); 605 if (key == IPC_PRIVATE || (msgflg & IPC_CREAT)) { 606 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 607 /* 608 * Look for an unallocated and unlocked msqid_ds. 609 * msqid_ds's can be locked by msgsnd or msgrcv while 610 * they are copying the message in/out. We can't 611 * re-use the entry until they release it. 612 */ 613 msqkptr = &msqids[msqid]; 614 if (msqkptr->u.msg_qbytes == 0 && 615 (msqkptr->u.msg_perm.mode & MSG_LOCKED) == 0) 616 break; 617 } 618 if (msqid == msginfo.msgmni) { 619 DPRINTF(("no more msqid_ds's available\n")); 620 error = ENOSPC; 621 goto done2; 622 } 623 PROC_LOCK(td->td_proc); 624 error = racct_add(td->td_proc, RACCT_NMSGQ, 1); 625 PROC_UNLOCK(td->td_proc); 626 if (error != 0) { 627 error = ENOSPC; 628 goto done2; 629 } 630 DPRINTF(("msqid %d is available\n", msqid)); 631 msqkptr->u.msg_perm.key = key; 632 msqkptr->u.msg_perm.cuid = cred->cr_uid; 633 msqkptr->u.msg_perm.uid = cred->cr_uid; 634 msqkptr->u.msg_perm.cgid = cred->cr_gid; 635 msqkptr->u.msg_perm.gid = cred->cr_gid; 636 msqkptr->u.msg_perm.mode = (msgflg & 0777); 637 msqkptr->cred = crhold(cred); 638 /* Make sure that the returned msqid is unique */ 639 msqkptr->u.msg_perm.seq = (msqkptr->u.msg_perm.seq + 1) & 0x7fff; 640 msqkptr->u.msg_first = NULL; 641 msqkptr->u.msg_last = NULL; 642 msqkptr->u.msg_cbytes = 0; 643 msqkptr->u.msg_qnum = 0; 644 msqkptr->u.msg_qbytes = msginfo.msgmnb; 645 msqkptr->u.msg_lspid = 0; 646 msqkptr->u.msg_lrpid = 0; 647 msqkptr->u.msg_stime = 0; 648 msqkptr->u.msg_rtime = 0; 649 msqkptr->u.msg_ctime = time_second; 650 #ifdef MAC 651 mac_sysvmsq_create(cred, msqkptr); 652 #endif 653 } else { 654 DPRINTF(("didn't find it and wasn't asked to create it\n")); 655 error = ENOENT; 656 goto done2; 657 } 658 659 found: 660 /* Construct the unique msqid */ 661 td->td_retval[0] = IXSEQ_TO_IPCID(msqid, msqkptr->u.msg_perm); 662 done2: 663 mtx_unlock(&msq_mtx); 664 return (error); 665 } 666 667 #ifndef _SYS_SYSPROTO_H_ 668 struct msgsnd_args { 669 int msqid; 670 const void *msgp; 671 size_t msgsz; 672 int msgflg; 673 }; 674 #endif 675 int 676 kern_msgsnd(td, msqid, msgp, msgsz, msgflg, mtype) 677 struct thread *td; 678 int msqid; 679 const void *msgp; /* XXX msgp is actually mtext. */ 680 size_t msgsz; 681 int msgflg; 682 long mtype; 683 { 684 int msqix, segs_needed, error = 0; 685 register struct msqid_kernel *msqkptr; 686 register struct msg *msghdr; 687 short next; 688 size_t saved_msgsz; 689 690 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 691 return (ENOSYS); 692 693 mtx_lock(&msq_mtx); 694 msqix = IPCID_TO_IX(msqid); 695 696 if (msqix < 0 || msqix >= msginfo.msgmni) { 697 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 698 msginfo.msgmni)); 699 error = EINVAL; 700 goto done2; 701 } 702 703 msqkptr = &msqids[msqix]; 704 if (msqkptr->u.msg_qbytes == 0) { 705 DPRINTF(("no such message queue id\n")); 706 error = EINVAL; 707 goto done2; 708 } 709 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 710 DPRINTF(("wrong sequence number\n")); 711 error = EINVAL; 712 goto done2; 713 } 714 715 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_W))) { 716 DPRINTF(("requester doesn't have write access\n")); 717 goto done2; 718 } 719 720 #ifdef MAC 721 error = mac_sysvmsq_check_msqsnd(td->td_ucred, msqkptr); 722 if (error != 0) 723 goto done2; 724 #endif 725 726 PROC_LOCK(td->td_proc); 727 if (racct_add(td->td_proc, RACCT_MSGQQUEUED, 1)) { 728 PROC_UNLOCK(td->td_proc); 729 error = EAGAIN; 730 goto done2; 731 } 732 saved_msgsz = msgsz; 733 if (racct_add(td->td_proc, RACCT_MSGQSIZE, msgsz)) { 734 racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1); 735 PROC_UNLOCK(td->td_proc); 736 error = EAGAIN; 737 goto done2; 738 } 739 PROC_UNLOCK(td->td_proc); 740 741 segs_needed = (msgsz + msginfo.msgssz - 1) / msginfo.msgssz; 742 DPRINTF(("msgsz=%zu, msgssz=%d, segs_needed=%d\n", msgsz, 743 msginfo.msgssz, segs_needed)); 744 for (;;) { 745 int need_more_resources = 0; 746 747 /* 748 * check msgsz 749 * (inside this loop in case msg_qbytes changes while we sleep) 750 */ 751 752 if (msgsz > msqkptr->u.msg_qbytes) { 753 DPRINTF(("msgsz > msqkptr->u.msg_qbytes\n")); 754 error = EINVAL; 755 goto done3; 756 } 757 758 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) { 759 DPRINTF(("msqid is locked\n")); 760 need_more_resources = 1; 761 } 762 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) { 763 DPRINTF(("msgsz + msg_cbytes > msg_qbytes\n")); 764 need_more_resources = 1; 765 } 766 if (segs_needed > nfree_msgmaps) { 767 DPRINTF(("segs_needed > nfree_msgmaps\n")); 768 need_more_resources = 1; 769 } 770 if (free_msghdrs == NULL) { 771 DPRINTF(("no more msghdrs\n")); 772 need_more_resources = 1; 773 } 774 775 if (need_more_resources) { 776 int we_own_it; 777 778 if ((msgflg & IPC_NOWAIT) != 0) { 779 DPRINTF(("need more resources but caller " 780 "doesn't want to wait\n")); 781 error = EAGAIN; 782 goto done3; 783 } 784 785 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) { 786 DPRINTF(("we don't own the msqid_ds\n")); 787 we_own_it = 0; 788 } else { 789 /* Force later arrivals to wait for our 790 request */ 791 DPRINTF(("we own the msqid_ds\n")); 792 msqkptr->u.msg_perm.mode |= MSG_LOCKED; 793 we_own_it = 1; 794 } 795 DPRINTF(("msgsnd: goodnight\n")); 796 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH, 797 "msgsnd", hz); 798 DPRINTF(("msgsnd: good morning, error=%d\n", error)); 799 if (we_own_it) 800 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 801 if (error == EWOULDBLOCK) { 802 DPRINTF(("msgsnd: timed out\n")); 803 continue; 804 } 805 if (error != 0) { 806 DPRINTF(("msgsnd: interrupted system call\n")); 807 error = EINTR; 808 goto done3; 809 } 810 811 /* 812 * Make sure that the msq queue still exists 813 */ 814 815 if (msqkptr->u.msg_qbytes == 0) { 816 DPRINTF(("msqid deleted\n")); 817 error = EIDRM; 818 goto done3; 819 } 820 821 } else { 822 DPRINTF(("got all the resources that we need\n")); 823 break; 824 } 825 } 826 827 /* 828 * We have the resources that we need. 829 * Make sure! 830 */ 831 832 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) 833 panic("msg_perm.mode & MSG_LOCKED"); 834 if (segs_needed > nfree_msgmaps) 835 panic("segs_needed > nfree_msgmaps"); 836 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) 837 panic("msgsz + msg_cbytes > msg_qbytes"); 838 if (free_msghdrs == NULL) 839 panic("no more msghdrs"); 840 841 /* 842 * Re-lock the msqid_ds in case we page-fault when copying in the 843 * message 844 */ 845 846 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) 847 panic("msqid_ds is already locked"); 848 msqkptr->u.msg_perm.mode |= MSG_LOCKED; 849 850 /* 851 * Allocate a message header 852 */ 853 854 msghdr = free_msghdrs; 855 free_msghdrs = msghdr->msg_next; 856 msghdr->msg_spot = -1; 857 msghdr->msg_ts = msgsz; 858 msghdr->msg_type = mtype; 859 #ifdef MAC 860 /* 861 * XXXMAC: Should the mac_sysvmsq_check_msgmsq check follow here 862 * immediately? Or, should it be checked just before the msg is 863 * enqueued in the msgq (as it is done now)? 864 */ 865 mac_sysvmsg_create(td->td_ucred, msqkptr, msghdr); 866 #endif 867 868 /* 869 * Allocate space for the message 870 */ 871 872 while (segs_needed > 0) { 873 if (nfree_msgmaps <= 0) 874 panic("not enough msgmaps"); 875 if (free_msgmaps == -1) 876 panic("nil free_msgmaps"); 877 next = free_msgmaps; 878 if (next <= -1) 879 panic("next too low #1"); 880 if (next >= msginfo.msgseg) 881 panic("next out of range #1"); 882 DPRINTF(("allocating segment %d to message\n", next)); 883 free_msgmaps = msgmaps[next].next; 884 nfree_msgmaps--; 885 msgmaps[next].next = msghdr->msg_spot; 886 msghdr->msg_spot = next; 887 segs_needed--; 888 } 889 890 /* 891 * Validate the message type 892 */ 893 894 if (msghdr->msg_type < 1) { 895 msg_freehdr(msghdr); 896 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 897 wakeup(msqkptr); 898 DPRINTF(("mtype (%ld) < 1\n", msghdr->msg_type)); 899 error = EINVAL; 900 goto done3; 901 } 902 903 /* 904 * Copy in the message body 905 */ 906 907 next = msghdr->msg_spot; 908 while (msgsz > 0) { 909 size_t tlen; 910 if (msgsz > msginfo.msgssz) 911 tlen = msginfo.msgssz; 912 else 913 tlen = msgsz; 914 if (next <= -1) 915 panic("next too low #2"); 916 if (next >= msginfo.msgseg) 917 panic("next out of range #2"); 918 mtx_unlock(&msq_mtx); 919 if ((error = copyin(msgp, &msgpool[next * msginfo.msgssz], 920 tlen)) != 0) { 921 mtx_lock(&msq_mtx); 922 DPRINTF(("error %d copying in message segment\n", 923 error)); 924 msg_freehdr(msghdr); 925 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 926 wakeup(msqkptr); 927 goto done3; 928 } 929 mtx_lock(&msq_mtx); 930 msgsz -= tlen; 931 msgp = (const char *)msgp + tlen; 932 next = msgmaps[next].next; 933 } 934 if (next != -1) 935 panic("didn't use all the msg segments"); 936 937 /* 938 * We've got the message. Unlock the msqid_ds. 939 */ 940 941 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 942 943 /* 944 * Make sure that the msqid_ds is still allocated. 945 */ 946 947 if (msqkptr->u.msg_qbytes == 0) { 948 msg_freehdr(msghdr); 949 wakeup(msqkptr); 950 error = EIDRM; 951 goto done3; 952 } 953 954 #ifdef MAC 955 /* 956 * Note: Since the task/thread allocates the msghdr and usually 957 * primes it with its own MAC label, for a majority of policies, it 958 * won't be necessary to check whether the msghdr has access 959 * permissions to the msgq. The mac_sysvmsq_check_msqsnd check would 960 * suffice in that case. However, this hook may be required where 961 * individual policies derive a non-identical label for the msghdr 962 * from the current thread label and may want to check the msghdr 963 * enqueue permissions, along with read/write permissions to the 964 * msgq. 965 */ 966 error = mac_sysvmsq_check_msgmsq(td->td_ucred, msghdr, msqkptr); 967 if (error != 0) { 968 msg_freehdr(msghdr); 969 wakeup(msqkptr); 970 goto done3; 971 } 972 #endif 973 974 /* 975 * Put the message into the queue 976 */ 977 if (msqkptr->u.msg_first == NULL) { 978 msqkptr->u.msg_first = msghdr; 979 msqkptr->u.msg_last = msghdr; 980 } else { 981 msqkptr->u.msg_last->msg_next = msghdr; 982 msqkptr->u.msg_last = msghdr; 983 } 984 msqkptr->u.msg_last->msg_next = NULL; 985 986 msqkptr->u.msg_cbytes += msghdr->msg_ts; 987 msqkptr->u.msg_qnum++; 988 msqkptr->u.msg_lspid = td->td_proc->p_pid; 989 msqkptr->u.msg_stime = time_second; 990 991 wakeup(msqkptr); 992 td->td_retval[0] = 0; 993 done3: 994 if (error != 0) { 995 PROC_LOCK(td->td_proc); 996 racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1); 997 racct_sub(td->td_proc, RACCT_MSGQSIZE, saved_msgsz); 998 PROC_UNLOCK(td->td_proc); 999 } 1000 done2: 1001 mtx_unlock(&msq_mtx); 1002 return (error); 1003 } 1004 1005 int 1006 msgsnd(td, uap) 1007 struct thread *td; 1008 register struct msgsnd_args *uap; 1009 { 1010 int error; 1011 long mtype; 1012 1013 DPRINTF(("call to msgsnd(%d, %p, %zu, %d)\n", uap->msqid, uap->msgp, 1014 uap->msgsz, uap->msgflg)); 1015 1016 if ((error = copyin(uap->msgp, &mtype, sizeof(mtype))) != 0) { 1017 DPRINTF(("error %d copying the message type\n", error)); 1018 return (error); 1019 } 1020 return (kern_msgsnd(td, uap->msqid, 1021 (const char *)uap->msgp + sizeof(mtype), 1022 uap->msgsz, uap->msgflg, mtype)); 1023 } 1024 1025 #ifndef _SYS_SYSPROTO_H_ 1026 struct msgrcv_args { 1027 int msqid; 1028 void *msgp; 1029 size_t msgsz; 1030 long msgtyp; 1031 int msgflg; 1032 }; 1033 #endif 1034 int 1035 kern_msgrcv(td, msqid, msgp, msgsz, msgtyp, msgflg, mtype) 1036 struct thread *td; 1037 int msqid; 1038 void *msgp; /* XXX msgp is actually mtext. */ 1039 size_t msgsz; 1040 long msgtyp; 1041 int msgflg; 1042 long *mtype; 1043 { 1044 size_t len; 1045 register struct msqid_kernel *msqkptr; 1046 register struct msg *msghdr; 1047 int msqix, error = 0; 1048 short next; 1049 1050 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 1051 return (ENOSYS); 1052 1053 msqix = IPCID_TO_IX(msqid); 1054 1055 if (msqix < 0 || msqix >= msginfo.msgmni) { 1056 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 1057 msginfo.msgmni)); 1058 return (EINVAL); 1059 } 1060 1061 msqkptr = &msqids[msqix]; 1062 mtx_lock(&msq_mtx); 1063 if (msqkptr->u.msg_qbytes == 0) { 1064 DPRINTF(("no such message queue id\n")); 1065 error = EINVAL; 1066 goto done2; 1067 } 1068 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 1069 DPRINTF(("wrong sequence number\n")); 1070 error = EINVAL; 1071 goto done2; 1072 } 1073 1074 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) { 1075 DPRINTF(("requester doesn't have read access\n")); 1076 goto done2; 1077 } 1078 1079 #ifdef MAC 1080 error = mac_sysvmsq_check_msqrcv(td->td_ucred, msqkptr); 1081 if (error != 0) 1082 goto done2; 1083 #endif 1084 1085 msghdr = NULL; 1086 while (msghdr == NULL) { 1087 if (msgtyp == 0) { 1088 msghdr = msqkptr->u.msg_first; 1089 if (msghdr != NULL) { 1090 if (msgsz < msghdr->msg_ts && 1091 (msgflg & MSG_NOERROR) == 0) { 1092 DPRINTF(("first message on the queue " 1093 "is too big (want %zu, got %d)\n", 1094 msgsz, msghdr->msg_ts)); 1095 error = E2BIG; 1096 goto done2; 1097 } 1098 #ifdef MAC 1099 error = mac_sysvmsq_check_msgrcv(td->td_ucred, 1100 msghdr); 1101 if (error != 0) 1102 goto done2; 1103 #endif 1104 if (msqkptr->u.msg_first == msqkptr->u.msg_last) { 1105 msqkptr->u.msg_first = NULL; 1106 msqkptr->u.msg_last = NULL; 1107 } else { 1108 msqkptr->u.msg_first = msghdr->msg_next; 1109 if (msqkptr->u.msg_first == NULL) 1110 panic("msg_first/last screwed up #1"); 1111 } 1112 } 1113 } else { 1114 struct msg *previous; 1115 struct msg **prev; 1116 1117 previous = NULL; 1118 prev = &(msqkptr->u.msg_first); 1119 while ((msghdr = *prev) != NULL) { 1120 /* 1121 * Is this message's type an exact match or is 1122 * this message's type less than or equal to 1123 * the absolute value of a negative msgtyp? 1124 * Note that the second half of this test can 1125 * NEVER be true if msgtyp is positive since 1126 * msg_type is always positive! 1127 */ 1128 1129 if (msgtyp == msghdr->msg_type || 1130 msghdr->msg_type <= -msgtyp) { 1131 DPRINTF(("found message type %ld, " 1132 "requested %ld\n", 1133 msghdr->msg_type, msgtyp)); 1134 if (msgsz < msghdr->msg_ts && 1135 (msgflg & MSG_NOERROR) == 0) { 1136 DPRINTF(("requested message " 1137 "on the queue is too big " 1138 "(want %zu, got %hu)\n", 1139 msgsz, msghdr->msg_ts)); 1140 error = E2BIG; 1141 goto done2; 1142 } 1143 #ifdef MAC 1144 error = mac_sysvmsq_check_msgrcv( 1145 td->td_ucred, msghdr); 1146 if (error != 0) 1147 goto done2; 1148 #endif 1149 *prev = msghdr->msg_next; 1150 if (msghdr == msqkptr->u.msg_last) { 1151 if (previous == NULL) { 1152 if (prev != 1153 &msqkptr->u.msg_first) 1154 panic("msg_first/last screwed up #2"); 1155 msqkptr->u.msg_first = 1156 NULL; 1157 msqkptr->u.msg_last = 1158 NULL; 1159 } else { 1160 if (prev == 1161 &msqkptr->u.msg_first) 1162 panic("msg_first/last screwed up #3"); 1163 msqkptr->u.msg_last = 1164 previous; 1165 } 1166 } 1167 break; 1168 } 1169 previous = msghdr; 1170 prev = &(msghdr->msg_next); 1171 } 1172 } 1173 1174 /* 1175 * We've either extracted the msghdr for the appropriate 1176 * message or there isn't one. 1177 * If there is one then bail out of this loop. 1178 */ 1179 1180 if (msghdr != NULL) 1181 break; 1182 1183 /* 1184 * Hmph! No message found. Does the user want to wait? 1185 */ 1186 1187 if ((msgflg & IPC_NOWAIT) != 0) { 1188 DPRINTF(("no appropriate message found (msgtyp=%ld)\n", 1189 msgtyp)); 1190 /* The SVID says to return ENOMSG. */ 1191 error = ENOMSG; 1192 goto done2; 1193 } 1194 1195 /* 1196 * Wait for something to happen 1197 */ 1198 1199 DPRINTF(("msgrcv: goodnight\n")); 1200 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH, 1201 "msgrcv", 0); 1202 DPRINTF(("msgrcv: good morning (error=%d)\n", error)); 1203 1204 if (error != 0) { 1205 DPRINTF(("msgrcv: interrupted system call\n")); 1206 error = EINTR; 1207 goto done2; 1208 } 1209 1210 /* 1211 * Make sure that the msq queue still exists 1212 */ 1213 1214 if (msqkptr->u.msg_qbytes == 0 || 1215 msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 1216 DPRINTF(("msqid deleted\n")); 1217 error = EIDRM; 1218 goto done2; 1219 } 1220 } 1221 1222 /* 1223 * Return the message to the user. 1224 * 1225 * First, do the bookkeeping (before we risk being interrupted). 1226 */ 1227 1228 msqkptr->u.msg_cbytes -= msghdr->msg_ts; 1229 msqkptr->u.msg_qnum--; 1230 msqkptr->u.msg_lrpid = td->td_proc->p_pid; 1231 msqkptr->u.msg_rtime = time_second; 1232 1233 racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, 1); 1234 racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msghdr->msg_ts); 1235 1236 /* 1237 * Make msgsz the actual amount that we'll be returning. 1238 * Note that this effectively truncates the message if it is too long 1239 * (since msgsz is never increased). 1240 */ 1241 1242 DPRINTF(("found a message, msgsz=%zu, msg_ts=%hu\n", msgsz, 1243 msghdr->msg_ts)); 1244 if (msgsz > msghdr->msg_ts) 1245 msgsz = msghdr->msg_ts; 1246 *mtype = msghdr->msg_type; 1247 1248 /* 1249 * Return the segments to the user 1250 */ 1251 1252 next = msghdr->msg_spot; 1253 for (len = 0; len < msgsz; len += msginfo.msgssz) { 1254 size_t tlen; 1255 1256 if (msgsz - len > msginfo.msgssz) 1257 tlen = msginfo.msgssz; 1258 else 1259 tlen = msgsz - len; 1260 if (next <= -1) 1261 panic("next too low #3"); 1262 if (next >= msginfo.msgseg) 1263 panic("next out of range #3"); 1264 mtx_unlock(&msq_mtx); 1265 error = copyout(&msgpool[next * msginfo.msgssz], msgp, tlen); 1266 mtx_lock(&msq_mtx); 1267 if (error != 0) { 1268 DPRINTF(("error (%d) copying out message segment\n", 1269 error)); 1270 msg_freehdr(msghdr); 1271 wakeup(msqkptr); 1272 goto done2; 1273 } 1274 msgp = (char *)msgp + tlen; 1275 next = msgmaps[next].next; 1276 } 1277 1278 /* 1279 * Done, return the actual number of bytes copied out. 1280 */ 1281 1282 msg_freehdr(msghdr); 1283 wakeup(msqkptr); 1284 td->td_retval[0] = msgsz; 1285 done2: 1286 mtx_unlock(&msq_mtx); 1287 return (error); 1288 } 1289 1290 int 1291 msgrcv(td, uap) 1292 struct thread *td; 1293 register struct msgrcv_args *uap; 1294 { 1295 int error; 1296 long mtype; 1297 1298 DPRINTF(("call to msgrcv(%d, %p, %zu, %ld, %d)\n", uap->msqid, 1299 uap->msgp, uap->msgsz, uap->msgtyp, uap->msgflg)); 1300 1301 if ((error = kern_msgrcv(td, uap->msqid, 1302 (char *)uap->msgp + sizeof(mtype), uap->msgsz, 1303 uap->msgtyp, uap->msgflg, &mtype)) != 0) 1304 return (error); 1305 if ((error = copyout(&mtype, uap->msgp, sizeof(mtype))) != 0) 1306 DPRINTF(("error %d copying the message type\n", error)); 1307 return (error); 1308 } 1309 1310 static int 1311 sysctl_msqids(SYSCTL_HANDLER_ARGS) 1312 { 1313 1314 return (SYSCTL_OUT(req, msqids, 1315 sizeof(struct msqid_kernel) * msginfo.msgmni)); 1316 } 1317 1318 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmax, CTLFLAG_RD, &msginfo.msgmax, 0, 1319 "Maximum message size"); 1320 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmni, CTLFLAG_RDTUN, &msginfo.msgmni, 0, 1321 "Number of message queue identifiers"); 1322 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmnb, CTLFLAG_RDTUN, &msginfo.msgmnb, 0, 1323 "Maximum number of bytes in a queue"); 1324 SYSCTL_INT(_kern_ipc, OID_AUTO, msgtql, CTLFLAG_RDTUN, &msginfo.msgtql, 0, 1325 "Maximum number of messages in the system"); 1326 SYSCTL_INT(_kern_ipc, OID_AUTO, msgssz, CTLFLAG_RDTUN, &msginfo.msgssz, 0, 1327 "Size of a message segment"); 1328 SYSCTL_INT(_kern_ipc, OID_AUTO, msgseg, CTLFLAG_RDTUN, &msginfo.msgseg, 0, 1329 "Number of message segments"); 1330 SYSCTL_PROC(_kern_ipc, OID_AUTO, msqids, CTLTYPE_OPAQUE | CTLFLAG_RD, 1331 NULL, 0, sysctl_msqids, "", "Message queue IDs"); 1332 1333 #ifdef COMPAT_FREEBSD32 1334 int 1335 freebsd32_msgsys(struct thread *td, struct freebsd32_msgsys_args *uap) 1336 { 1337 1338 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1339 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1340 switch (uap->which) { 1341 case 0: 1342 return (freebsd7_freebsd32_msgctl(td, 1343 (struct freebsd7_freebsd32_msgctl_args *)&uap->a2)); 1344 case 2: 1345 return (freebsd32_msgsnd(td, 1346 (struct freebsd32_msgsnd_args *)&uap->a2)); 1347 case 3: 1348 return (freebsd32_msgrcv(td, 1349 (struct freebsd32_msgrcv_args *)&uap->a2)); 1350 default: 1351 return (msgsys(td, (struct msgsys_args *)uap)); 1352 } 1353 #else 1354 return (nosys(td, NULL)); 1355 #endif 1356 } 1357 1358 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1359 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1360 int 1361 freebsd7_freebsd32_msgctl(struct thread *td, 1362 struct freebsd7_freebsd32_msgctl_args *uap) 1363 { 1364 struct msqid_ds msqbuf; 1365 struct msqid_ds32_old msqbuf32; 1366 int error; 1367 1368 if (uap->cmd == IPC_SET) { 1369 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32)); 1370 if (error) 1371 return (error); 1372 freebsd32_ipcperm_old_in(&msqbuf32.msg_perm, &msqbuf.msg_perm); 1373 PTRIN_CP(msqbuf32, msqbuf, msg_first); 1374 PTRIN_CP(msqbuf32, msqbuf, msg_last); 1375 CP(msqbuf32, msqbuf, msg_cbytes); 1376 CP(msqbuf32, msqbuf, msg_qnum); 1377 CP(msqbuf32, msqbuf, msg_qbytes); 1378 CP(msqbuf32, msqbuf, msg_lspid); 1379 CP(msqbuf32, msqbuf, msg_lrpid); 1380 CP(msqbuf32, msqbuf, msg_stime); 1381 CP(msqbuf32, msqbuf, msg_rtime); 1382 CP(msqbuf32, msqbuf, msg_ctime); 1383 } 1384 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1385 if (error) 1386 return (error); 1387 if (uap->cmd == IPC_STAT) { 1388 bzero(&msqbuf32, sizeof(msqbuf32)); 1389 freebsd32_ipcperm_old_out(&msqbuf.msg_perm, &msqbuf32.msg_perm); 1390 PTROUT_CP(msqbuf, msqbuf32, msg_first); 1391 PTROUT_CP(msqbuf, msqbuf32, msg_last); 1392 CP(msqbuf, msqbuf32, msg_cbytes); 1393 CP(msqbuf, msqbuf32, msg_qnum); 1394 CP(msqbuf, msqbuf32, msg_qbytes); 1395 CP(msqbuf, msqbuf32, msg_lspid); 1396 CP(msqbuf, msqbuf32, msg_lrpid); 1397 CP(msqbuf, msqbuf32, msg_stime); 1398 CP(msqbuf, msqbuf32, msg_rtime); 1399 CP(msqbuf, msqbuf32, msg_ctime); 1400 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32)); 1401 } 1402 return (error); 1403 } 1404 #endif 1405 1406 int 1407 freebsd32_msgctl(struct thread *td, struct freebsd32_msgctl_args *uap) 1408 { 1409 struct msqid_ds msqbuf; 1410 struct msqid_ds32 msqbuf32; 1411 int error; 1412 1413 if (uap->cmd == IPC_SET) { 1414 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32)); 1415 if (error) 1416 return (error); 1417 freebsd32_ipcperm_in(&msqbuf32.msg_perm, &msqbuf.msg_perm); 1418 PTRIN_CP(msqbuf32, msqbuf, msg_first); 1419 PTRIN_CP(msqbuf32, msqbuf, msg_last); 1420 CP(msqbuf32, msqbuf, msg_cbytes); 1421 CP(msqbuf32, msqbuf, msg_qnum); 1422 CP(msqbuf32, msqbuf, msg_qbytes); 1423 CP(msqbuf32, msqbuf, msg_lspid); 1424 CP(msqbuf32, msqbuf, msg_lrpid); 1425 CP(msqbuf32, msqbuf, msg_stime); 1426 CP(msqbuf32, msqbuf, msg_rtime); 1427 CP(msqbuf32, msqbuf, msg_ctime); 1428 } 1429 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1430 if (error) 1431 return (error); 1432 if (uap->cmd == IPC_STAT) { 1433 freebsd32_ipcperm_out(&msqbuf.msg_perm, &msqbuf32.msg_perm); 1434 PTROUT_CP(msqbuf, msqbuf32, msg_first); 1435 PTROUT_CP(msqbuf, msqbuf32, msg_last); 1436 CP(msqbuf, msqbuf32, msg_cbytes); 1437 CP(msqbuf, msqbuf32, msg_qnum); 1438 CP(msqbuf, msqbuf32, msg_qbytes); 1439 CP(msqbuf, msqbuf32, msg_lspid); 1440 CP(msqbuf, msqbuf32, msg_lrpid); 1441 CP(msqbuf, msqbuf32, msg_stime); 1442 CP(msqbuf, msqbuf32, msg_rtime); 1443 CP(msqbuf, msqbuf32, msg_ctime); 1444 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32)); 1445 } 1446 return (error); 1447 } 1448 1449 int 1450 freebsd32_msgsnd(struct thread *td, struct freebsd32_msgsnd_args *uap) 1451 { 1452 const void *msgp; 1453 long mtype; 1454 int32_t mtype32; 1455 int error; 1456 1457 msgp = PTRIN(uap->msgp); 1458 if ((error = copyin(msgp, &mtype32, sizeof(mtype32))) != 0) 1459 return (error); 1460 mtype = mtype32; 1461 return (kern_msgsnd(td, uap->msqid, 1462 (const char *)msgp + sizeof(mtype32), 1463 uap->msgsz, uap->msgflg, mtype)); 1464 } 1465 1466 int 1467 freebsd32_msgrcv(struct thread *td, struct freebsd32_msgrcv_args *uap) 1468 { 1469 void *msgp; 1470 long mtype; 1471 int32_t mtype32; 1472 int error; 1473 1474 msgp = PTRIN(uap->msgp); 1475 if ((error = kern_msgrcv(td, uap->msqid, 1476 (char *)msgp + sizeof(mtype32), uap->msgsz, 1477 uap->msgtyp, uap->msgflg, &mtype)) != 0) 1478 return (error); 1479 mtype32 = (int32_t)mtype; 1480 return (copyout(&mtype32, msgp, sizeof(mtype32))); 1481 } 1482 #endif 1483 1484 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1485 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1486 1487 /* XXX casting to (sy_call_t *) is bogus, as usual. */ 1488 static sy_call_t *msgcalls[] = { 1489 (sy_call_t *)freebsd7_msgctl, (sy_call_t *)msgget, 1490 (sy_call_t *)msgsnd, (sy_call_t *)msgrcv 1491 }; 1492 1493 /* 1494 * Entry point for all MSG calls. 1495 */ 1496 int 1497 msgsys(td, uap) 1498 struct thread *td; 1499 /* XXX actually varargs. */ 1500 struct msgsys_args /* { 1501 int which; 1502 int a2; 1503 int a3; 1504 int a4; 1505 int a5; 1506 int a6; 1507 } */ *uap; 1508 { 1509 int error; 1510 1511 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 1512 return (ENOSYS); 1513 if (uap->which < 0 || 1514 uap->which >= sizeof(msgcalls)/sizeof(msgcalls[0])) 1515 return (EINVAL); 1516 error = (*msgcalls[uap->which])(td, &uap->a2); 1517 return (error); 1518 } 1519 1520 #ifndef CP 1521 #define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0) 1522 #endif 1523 1524 #ifndef _SYS_SYSPROTO_H_ 1525 struct freebsd7_msgctl_args { 1526 int msqid; 1527 int cmd; 1528 struct msqid_ds_old *buf; 1529 }; 1530 #endif 1531 int 1532 freebsd7_msgctl(td, uap) 1533 struct thread *td; 1534 struct freebsd7_msgctl_args *uap; 1535 { 1536 struct msqid_ds_old msqold; 1537 struct msqid_ds msqbuf; 1538 int error; 1539 1540 DPRINTF(("call to freebsd7_msgctl(%d, %d, %p)\n", uap->msqid, uap->cmd, 1541 uap->buf)); 1542 if (uap->cmd == IPC_SET) { 1543 error = copyin(uap->buf, &msqold, sizeof(msqold)); 1544 if (error) 1545 return (error); 1546 ipcperm_old2new(&msqold.msg_perm, &msqbuf.msg_perm); 1547 CP(msqold, msqbuf, msg_first); 1548 CP(msqold, msqbuf, msg_last); 1549 CP(msqold, msqbuf, msg_cbytes); 1550 CP(msqold, msqbuf, msg_qnum); 1551 CP(msqold, msqbuf, msg_qbytes); 1552 CP(msqold, msqbuf, msg_lspid); 1553 CP(msqold, msqbuf, msg_lrpid); 1554 CP(msqold, msqbuf, msg_stime); 1555 CP(msqold, msqbuf, msg_rtime); 1556 CP(msqold, msqbuf, msg_ctime); 1557 } 1558 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1559 if (error) 1560 return (error); 1561 if (uap->cmd == IPC_STAT) { 1562 bzero(&msqold, sizeof(msqold)); 1563 ipcperm_new2old(&msqbuf.msg_perm, &msqold.msg_perm); 1564 CP(msqbuf, msqold, msg_first); 1565 CP(msqbuf, msqold, msg_last); 1566 CP(msqbuf, msqold, msg_cbytes); 1567 CP(msqbuf, msqold, msg_qnum); 1568 CP(msqbuf, msqold, msg_qbytes); 1569 CP(msqbuf, msqold, msg_lspid); 1570 CP(msqbuf, msqold, msg_lrpid); 1571 CP(msqbuf, msqold, msg_stime); 1572 CP(msqbuf, msqold, msg_rtime); 1573 CP(msqbuf, msqold, msg_ctime); 1574 error = copyout(&msqold, uap->buf, sizeof(struct msqid_ds_old)); 1575 } 1576 return (error); 1577 } 1578 1579 #undef CP 1580 1581 #endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 || 1582 COMPAT_FREEBSD7 */ 1583