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 #ifdef RACCT 624 PROC_LOCK(td->td_proc); 625 error = racct_add(td->td_proc, RACCT_NMSGQ, 1); 626 PROC_UNLOCK(td->td_proc); 627 if (error != 0) { 628 error = ENOSPC; 629 goto done2; 630 } 631 #endif 632 DPRINTF(("msqid %d is available\n", msqid)); 633 msqkptr->u.msg_perm.key = key; 634 msqkptr->u.msg_perm.cuid = cred->cr_uid; 635 msqkptr->u.msg_perm.uid = cred->cr_uid; 636 msqkptr->u.msg_perm.cgid = cred->cr_gid; 637 msqkptr->u.msg_perm.gid = cred->cr_gid; 638 msqkptr->u.msg_perm.mode = (msgflg & 0777); 639 msqkptr->cred = crhold(cred); 640 /* Make sure that the returned msqid is unique */ 641 msqkptr->u.msg_perm.seq = (msqkptr->u.msg_perm.seq + 1) & 0x7fff; 642 msqkptr->u.msg_first = NULL; 643 msqkptr->u.msg_last = NULL; 644 msqkptr->u.msg_cbytes = 0; 645 msqkptr->u.msg_qnum = 0; 646 msqkptr->u.msg_qbytes = msginfo.msgmnb; 647 msqkptr->u.msg_lspid = 0; 648 msqkptr->u.msg_lrpid = 0; 649 msqkptr->u.msg_stime = 0; 650 msqkptr->u.msg_rtime = 0; 651 msqkptr->u.msg_ctime = time_second; 652 #ifdef MAC 653 mac_sysvmsq_create(cred, msqkptr); 654 #endif 655 } else { 656 DPRINTF(("didn't find it and wasn't asked to create it\n")); 657 error = ENOENT; 658 goto done2; 659 } 660 661 found: 662 /* Construct the unique msqid */ 663 td->td_retval[0] = IXSEQ_TO_IPCID(msqid, msqkptr->u.msg_perm); 664 done2: 665 mtx_unlock(&msq_mtx); 666 return (error); 667 } 668 669 #ifndef _SYS_SYSPROTO_H_ 670 struct msgsnd_args { 671 int msqid; 672 const void *msgp; 673 size_t msgsz; 674 int msgflg; 675 }; 676 #endif 677 int 678 kern_msgsnd(td, msqid, msgp, msgsz, msgflg, mtype) 679 struct thread *td; 680 int msqid; 681 const void *msgp; /* XXX msgp is actually mtext. */ 682 size_t msgsz; 683 int msgflg; 684 long mtype; 685 { 686 int msqix, segs_needed, error = 0; 687 register struct msqid_kernel *msqkptr; 688 register struct msg *msghdr; 689 short next; 690 #ifdef RACCT 691 size_t saved_msgsz; 692 #endif 693 694 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 695 return (ENOSYS); 696 697 mtx_lock(&msq_mtx); 698 msqix = IPCID_TO_IX(msqid); 699 700 if (msqix < 0 || msqix >= msginfo.msgmni) { 701 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 702 msginfo.msgmni)); 703 error = EINVAL; 704 goto done2; 705 } 706 707 msqkptr = &msqids[msqix]; 708 if (msqkptr->u.msg_qbytes == 0) { 709 DPRINTF(("no such message queue id\n")); 710 error = EINVAL; 711 goto done2; 712 } 713 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 714 DPRINTF(("wrong sequence number\n")); 715 error = EINVAL; 716 goto done2; 717 } 718 719 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_W))) { 720 DPRINTF(("requester doesn't have write access\n")); 721 goto done2; 722 } 723 724 #ifdef MAC 725 error = mac_sysvmsq_check_msqsnd(td->td_ucred, msqkptr); 726 if (error != 0) 727 goto done2; 728 #endif 729 730 #ifdef RACCT 731 PROC_LOCK(td->td_proc); 732 if (racct_add(td->td_proc, RACCT_MSGQQUEUED, 1)) { 733 PROC_UNLOCK(td->td_proc); 734 error = EAGAIN; 735 goto done2; 736 } 737 saved_msgsz = msgsz; 738 if (racct_add(td->td_proc, RACCT_MSGQSIZE, msgsz)) { 739 racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1); 740 PROC_UNLOCK(td->td_proc); 741 error = EAGAIN; 742 goto done2; 743 } 744 PROC_UNLOCK(td->td_proc); 745 #endif 746 747 segs_needed = (msgsz + msginfo.msgssz - 1) / msginfo.msgssz; 748 DPRINTF(("msgsz=%zu, msgssz=%d, segs_needed=%d\n", msgsz, 749 msginfo.msgssz, segs_needed)); 750 for (;;) { 751 int need_more_resources = 0; 752 753 /* 754 * check msgsz 755 * (inside this loop in case msg_qbytes changes while we sleep) 756 */ 757 758 if (msgsz > msqkptr->u.msg_qbytes) { 759 DPRINTF(("msgsz > msqkptr->u.msg_qbytes\n")); 760 error = EINVAL; 761 goto done3; 762 } 763 764 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) { 765 DPRINTF(("msqid is locked\n")); 766 need_more_resources = 1; 767 } 768 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) { 769 DPRINTF(("msgsz + msg_cbytes > msg_qbytes\n")); 770 need_more_resources = 1; 771 } 772 if (segs_needed > nfree_msgmaps) { 773 DPRINTF(("segs_needed > nfree_msgmaps\n")); 774 need_more_resources = 1; 775 } 776 if (free_msghdrs == NULL) { 777 DPRINTF(("no more msghdrs\n")); 778 need_more_resources = 1; 779 } 780 781 if (need_more_resources) { 782 int we_own_it; 783 784 if ((msgflg & IPC_NOWAIT) != 0) { 785 DPRINTF(("need more resources but caller " 786 "doesn't want to wait\n")); 787 error = EAGAIN; 788 goto done3; 789 } 790 791 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) { 792 DPRINTF(("we don't own the msqid_ds\n")); 793 we_own_it = 0; 794 } else { 795 /* Force later arrivals to wait for our 796 request */ 797 DPRINTF(("we own the msqid_ds\n")); 798 msqkptr->u.msg_perm.mode |= MSG_LOCKED; 799 we_own_it = 1; 800 } 801 DPRINTF(("msgsnd: goodnight\n")); 802 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH, 803 "msgsnd", hz); 804 DPRINTF(("msgsnd: good morning, error=%d\n", error)); 805 if (we_own_it) 806 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 807 if (error == EWOULDBLOCK) { 808 DPRINTF(("msgsnd: timed out\n")); 809 continue; 810 } 811 if (error != 0) { 812 DPRINTF(("msgsnd: interrupted system call\n")); 813 error = EINTR; 814 goto done3; 815 } 816 817 /* 818 * Make sure that the msq queue still exists 819 */ 820 821 if (msqkptr->u.msg_qbytes == 0) { 822 DPRINTF(("msqid deleted\n")); 823 error = EIDRM; 824 goto done3; 825 } 826 827 } else { 828 DPRINTF(("got all the resources that we need\n")); 829 break; 830 } 831 } 832 833 /* 834 * We have the resources that we need. 835 * Make sure! 836 */ 837 838 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) 839 panic("msg_perm.mode & MSG_LOCKED"); 840 if (segs_needed > nfree_msgmaps) 841 panic("segs_needed > nfree_msgmaps"); 842 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) 843 panic("msgsz + msg_cbytes > msg_qbytes"); 844 if (free_msghdrs == NULL) 845 panic("no more msghdrs"); 846 847 /* 848 * Re-lock the msqid_ds in case we page-fault when copying in the 849 * message 850 */ 851 852 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) 853 panic("msqid_ds is already locked"); 854 msqkptr->u.msg_perm.mode |= MSG_LOCKED; 855 856 /* 857 * Allocate a message header 858 */ 859 860 msghdr = free_msghdrs; 861 free_msghdrs = msghdr->msg_next; 862 msghdr->msg_spot = -1; 863 msghdr->msg_ts = msgsz; 864 msghdr->msg_type = mtype; 865 #ifdef MAC 866 /* 867 * XXXMAC: Should the mac_sysvmsq_check_msgmsq check follow here 868 * immediately? Or, should it be checked just before the msg is 869 * enqueued in the msgq (as it is done now)? 870 */ 871 mac_sysvmsg_create(td->td_ucred, msqkptr, msghdr); 872 #endif 873 874 /* 875 * Allocate space for the message 876 */ 877 878 while (segs_needed > 0) { 879 if (nfree_msgmaps <= 0) 880 panic("not enough msgmaps"); 881 if (free_msgmaps == -1) 882 panic("nil free_msgmaps"); 883 next = free_msgmaps; 884 if (next <= -1) 885 panic("next too low #1"); 886 if (next >= msginfo.msgseg) 887 panic("next out of range #1"); 888 DPRINTF(("allocating segment %d to message\n", next)); 889 free_msgmaps = msgmaps[next].next; 890 nfree_msgmaps--; 891 msgmaps[next].next = msghdr->msg_spot; 892 msghdr->msg_spot = next; 893 segs_needed--; 894 } 895 896 /* 897 * Validate the message type 898 */ 899 900 if (msghdr->msg_type < 1) { 901 msg_freehdr(msghdr); 902 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 903 wakeup(msqkptr); 904 DPRINTF(("mtype (%ld) < 1\n", msghdr->msg_type)); 905 error = EINVAL; 906 goto done3; 907 } 908 909 /* 910 * Copy in the message body 911 */ 912 913 next = msghdr->msg_spot; 914 while (msgsz > 0) { 915 size_t tlen; 916 if (msgsz > msginfo.msgssz) 917 tlen = msginfo.msgssz; 918 else 919 tlen = msgsz; 920 if (next <= -1) 921 panic("next too low #2"); 922 if (next >= msginfo.msgseg) 923 panic("next out of range #2"); 924 mtx_unlock(&msq_mtx); 925 if ((error = copyin(msgp, &msgpool[next * msginfo.msgssz], 926 tlen)) != 0) { 927 mtx_lock(&msq_mtx); 928 DPRINTF(("error %d copying in message segment\n", 929 error)); 930 msg_freehdr(msghdr); 931 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 932 wakeup(msqkptr); 933 goto done3; 934 } 935 mtx_lock(&msq_mtx); 936 msgsz -= tlen; 937 msgp = (const char *)msgp + tlen; 938 next = msgmaps[next].next; 939 } 940 if (next != -1) 941 panic("didn't use all the msg segments"); 942 943 /* 944 * We've got the message. Unlock the msqid_ds. 945 */ 946 947 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 948 949 /* 950 * Make sure that the msqid_ds is still allocated. 951 */ 952 953 if (msqkptr->u.msg_qbytes == 0) { 954 msg_freehdr(msghdr); 955 wakeup(msqkptr); 956 error = EIDRM; 957 goto done3; 958 } 959 960 #ifdef MAC 961 /* 962 * Note: Since the task/thread allocates the msghdr and usually 963 * primes it with its own MAC label, for a majority of policies, it 964 * won't be necessary to check whether the msghdr has access 965 * permissions to the msgq. The mac_sysvmsq_check_msqsnd check would 966 * suffice in that case. However, this hook may be required where 967 * individual policies derive a non-identical label for the msghdr 968 * from the current thread label and may want to check the msghdr 969 * enqueue permissions, along with read/write permissions to the 970 * msgq. 971 */ 972 error = mac_sysvmsq_check_msgmsq(td->td_ucred, msghdr, msqkptr); 973 if (error != 0) { 974 msg_freehdr(msghdr); 975 wakeup(msqkptr); 976 goto done3; 977 } 978 #endif 979 980 /* 981 * Put the message into the queue 982 */ 983 if (msqkptr->u.msg_first == NULL) { 984 msqkptr->u.msg_first = msghdr; 985 msqkptr->u.msg_last = msghdr; 986 } else { 987 msqkptr->u.msg_last->msg_next = msghdr; 988 msqkptr->u.msg_last = msghdr; 989 } 990 msqkptr->u.msg_last->msg_next = NULL; 991 992 msqkptr->u.msg_cbytes += msghdr->msg_ts; 993 msqkptr->u.msg_qnum++; 994 msqkptr->u.msg_lspid = td->td_proc->p_pid; 995 msqkptr->u.msg_stime = time_second; 996 997 wakeup(msqkptr); 998 td->td_retval[0] = 0; 999 done3: 1000 #ifdef RACCT 1001 if (error != 0) { 1002 PROC_LOCK(td->td_proc); 1003 racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1); 1004 racct_sub(td->td_proc, RACCT_MSGQSIZE, saved_msgsz); 1005 PROC_UNLOCK(td->td_proc); 1006 } 1007 #endif 1008 done2: 1009 mtx_unlock(&msq_mtx); 1010 return (error); 1011 } 1012 1013 int 1014 msgsnd(td, uap) 1015 struct thread *td; 1016 register struct msgsnd_args *uap; 1017 { 1018 int error; 1019 long mtype; 1020 1021 DPRINTF(("call to msgsnd(%d, %p, %zu, %d)\n", uap->msqid, uap->msgp, 1022 uap->msgsz, uap->msgflg)); 1023 1024 if ((error = copyin(uap->msgp, &mtype, sizeof(mtype))) != 0) { 1025 DPRINTF(("error %d copying the message type\n", error)); 1026 return (error); 1027 } 1028 return (kern_msgsnd(td, uap->msqid, 1029 (const char *)uap->msgp + sizeof(mtype), 1030 uap->msgsz, uap->msgflg, mtype)); 1031 } 1032 1033 #ifndef _SYS_SYSPROTO_H_ 1034 struct msgrcv_args { 1035 int msqid; 1036 void *msgp; 1037 size_t msgsz; 1038 long msgtyp; 1039 int msgflg; 1040 }; 1041 #endif 1042 int 1043 kern_msgrcv(td, msqid, msgp, msgsz, msgtyp, msgflg, mtype) 1044 struct thread *td; 1045 int msqid; 1046 void *msgp; /* XXX msgp is actually mtext. */ 1047 size_t msgsz; 1048 long msgtyp; 1049 int msgflg; 1050 long *mtype; 1051 { 1052 size_t len; 1053 register struct msqid_kernel *msqkptr; 1054 register struct msg *msghdr; 1055 int msqix, error = 0; 1056 short next; 1057 1058 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 1059 return (ENOSYS); 1060 1061 msqix = IPCID_TO_IX(msqid); 1062 1063 if (msqix < 0 || msqix >= msginfo.msgmni) { 1064 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 1065 msginfo.msgmni)); 1066 return (EINVAL); 1067 } 1068 1069 msqkptr = &msqids[msqix]; 1070 mtx_lock(&msq_mtx); 1071 if (msqkptr->u.msg_qbytes == 0) { 1072 DPRINTF(("no such message queue id\n")); 1073 error = EINVAL; 1074 goto done2; 1075 } 1076 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 1077 DPRINTF(("wrong sequence number\n")); 1078 error = EINVAL; 1079 goto done2; 1080 } 1081 1082 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) { 1083 DPRINTF(("requester doesn't have read access\n")); 1084 goto done2; 1085 } 1086 1087 #ifdef MAC 1088 error = mac_sysvmsq_check_msqrcv(td->td_ucred, msqkptr); 1089 if (error != 0) 1090 goto done2; 1091 #endif 1092 1093 msghdr = NULL; 1094 while (msghdr == NULL) { 1095 if (msgtyp == 0) { 1096 msghdr = msqkptr->u.msg_first; 1097 if (msghdr != NULL) { 1098 if (msgsz < msghdr->msg_ts && 1099 (msgflg & MSG_NOERROR) == 0) { 1100 DPRINTF(("first message on the queue " 1101 "is too big (want %zu, got %d)\n", 1102 msgsz, msghdr->msg_ts)); 1103 error = E2BIG; 1104 goto done2; 1105 } 1106 #ifdef MAC 1107 error = mac_sysvmsq_check_msgrcv(td->td_ucred, 1108 msghdr); 1109 if (error != 0) 1110 goto done2; 1111 #endif 1112 if (msqkptr->u.msg_first == msqkptr->u.msg_last) { 1113 msqkptr->u.msg_first = NULL; 1114 msqkptr->u.msg_last = NULL; 1115 } else { 1116 msqkptr->u.msg_first = msghdr->msg_next; 1117 if (msqkptr->u.msg_first == NULL) 1118 panic("msg_first/last screwed up #1"); 1119 } 1120 } 1121 } else { 1122 struct msg *previous; 1123 struct msg **prev; 1124 1125 previous = NULL; 1126 prev = &(msqkptr->u.msg_first); 1127 while ((msghdr = *prev) != NULL) { 1128 /* 1129 * Is this message's type an exact match or is 1130 * this message's type less than or equal to 1131 * the absolute value of a negative msgtyp? 1132 * Note that the second half of this test can 1133 * NEVER be true if msgtyp is positive since 1134 * msg_type is always positive! 1135 */ 1136 1137 if (msgtyp == msghdr->msg_type || 1138 msghdr->msg_type <= -msgtyp) { 1139 DPRINTF(("found message type %ld, " 1140 "requested %ld\n", 1141 msghdr->msg_type, msgtyp)); 1142 if (msgsz < msghdr->msg_ts && 1143 (msgflg & MSG_NOERROR) == 0) { 1144 DPRINTF(("requested message " 1145 "on the queue is too big " 1146 "(want %zu, got %hu)\n", 1147 msgsz, msghdr->msg_ts)); 1148 error = E2BIG; 1149 goto done2; 1150 } 1151 #ifdef MAC 1152 error = mac_sysvmsq_check_msgrcv( 1153 td->td_ucred, msghdr); 1154 if (error != 0) 1155 goto done2; 1156 #endif 1157 *prev = msghdr->msg_next; 1158 if (msghdr == msqkptr->u.msg_last) { 1159 if (previous == NULL) { 1160 if (prev != 1161 &msqkptr->u.msg_first) 1162 panic("msg_first/last screwed up #2"); 1163 msqkptr->u.msg_first = 1164 NULL; 1165 msqkptr->u.msg_last = 1166 NULL; 1167 } else { 1168 if (prev == 1169 &msqkptr->u.msg_first) 1170 panic("msg_first/last screwed up #3"); 1171 msqkptr->u.msg_last = 1172 previous; 1173 } 1174 } 1175 break; 1176 } 1177 previous = msghdr; 1178 prev = &(msghdr->msg_next); 1179 } 1180 } 1181 1182 /* 1183 * We've either extracted the msghdr for the appropriate 1184 * message or there isn't one. 1185 * If there is one then bail out of this loop. 1186 */ 1187 1188 if (msghdr != NULL) 1189 break; 1190 1191 /* 1192 * Hmph! No message found. Does the user want to wait? 1193 */ 1194 1195 if ((msgflg & IPC_NOWAIT) != 0) { 1196 DPRINTF(("no appropriate message found (msgtyp=%ld)\n", 1197 msgtyp)); 1198 /* The SVID says to return ENOMSG. */ 1199 error = ENOMSG; 1200 goto done2; 1201 } 1202 1203 /* 1204 * Wait for something to happen 1205 */ 1206 1207 DPRINTF(("msgrcv: goodnight\n")); 1208 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH, 1209 "msgrcv", 0); 1210 DPRINTF(("msgrcv: good morning (error=%d)\n", error)); 1211 1212 if (error != 0) { 1213 DPRINTF(("msgrcv: interrupted system call\n")); 1214 error = EINTR; 1215 goto done2; 1216 } 1217 1218 /* 1219 * Make sure that the msq queue still exists 1220 */ 1221 1222 if (msqkptr->u.msg_qbytes == 0 || 1223 msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 1224 DPRINTF(("msqid deleted\n")); 1225 error = EIDRM; 1226 goto done2; 1227 } 1228 } 1229 1230 /* 1231 * Return the message to the user. 1232 * 1233 * First, do the bookkeeping (before we risk being interrupted). 1234 */ 1235 1236 msqkptr->u.msg_cbytes -= msghdr->msg_ts; 1237 msqkptr->u.msg_qnum--; 1238 msqkptr->u.msg_lrpid = td->td_proc->p_pid; 1239 msqkptr->u.msg_rtime = time_second; 1240 1241 racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, 1); 1242 racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msghdr->msg_ts); 1243 1244 /* 1245 * Make msgsz the actual amount that we'll be returning. 1246 * Note that this effectively truncates the message if it is too long 1247 * (since msgsz is never increased). 1248 */ 1249 1250 DPRINTF(("found a message, msgsz=%zu, msg_ts=%hu\n", msgsz, 1251 msghdr->msg_ts)); 1252 if (msgsz > msghdr->msg_ts) 1253 msgsz = msghdr->msg_ts; 1254 *mtype = msghdr->msg_type; 1255 1256 /* 1257 * Return the segments to the user 1258 */ 1259 1260 next = msghdr->msg_spot; 1261 for (len = 0; len < msgsz; len += msginfo.msgssz) { 1262 size_t tlen; 1263 1264 if (msgsz - len > msginfo.msgssz) 1265 tlen = msginfo.msgssz; 1266 else 1267 tlen = msgsz - len; 1268 if (next <= -1) 1269 panic("next too low #3"); 1270 if (next >= msginfo.msgseg) 1271 panic("next out of range #3"); 1272 mtx_unlock(&msq_mtx); 1273 error = copyout(&msgpool[next * msginfo.msgssz], msgp, tlen); 1274 mtx_lock(&msq_mtx); 1275 if (error != 0) { 1276 DPRINTF(("error (%d) copying out message segment\n", 1277 error)); 1278 msg_freehdr(msghdr); 1279 wakeup(msqkptr); 1280 goto done2; 1281 } 1282 msgp = (char *)msgp + tlen; 1283 next = msgmaps[next].next; 1284 } 1285 1286 /* 1287 * Done, return the actual number of bytes copied out. 1288 */ 1289 1290 msg_freehdr(msghdr); 1291 wakeup(msqkptr); 1292 td->td_retval[0] = msgsz; 1293 done2: 1294 mtx_unlock(&msq_mtx); 1295 return (error); 1296 } 1297 1298 int 1299 msgrcv(td, uap) 1300 struct thread *td; 1301 register struct msgrcv_args *uap; 1302 { 1303 int error; 1304 long mtype; 1305 1306 DPRINTF(("call to msgrcv(%d, %p, %zu, %ld, %d)\n", uap->msqid, 1307 uap->msgp, uap->msgsz, uap->msgtyp, uap->msgflg)); 1308 1309 if ((error = kern_msgrcv(td, uap->msqid, 1310 (char *)uap->msgp + sizeof(mtype), uap->msgsz, 1311 uap->msgtyp, uap->msgflg, &mtype)) != 0) 1312 return (error); 1313 if ((error = copyout(&mtype, uap->msgp, sizeof(mtype))) != 0) 1314 DPRINTF(("error %d copying the message type\n", error)); 1315 return (error); 1316 } 1317 1318 static int 1319 sysctl_msqids(SYSCTL_HANDLER_ARGS) 1320 { 1321 1322 return (SYSCTL_OUT(req, msqids, 1323 sizeof(struct msqid_kernel) * msginfo.msgmni)); 1324 } 1325 1326 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmax, CTLFLAG_RD, &msginfo.msgmax, 0, 1327 "Maximum message size"); 1328 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmni, CTLFLAG_RDTUN, &msginfo.msgmni, 0, 1329 "Number of message queue identifiers"); 1330 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmnb, CTLFLAG_RDTUN, &msginfo.msgmnb, 0, 1331 "Maximum number of bytes in a queue"); 1332 SYSCTL_INT(_kern_ipc, OID_AUTO, msgtql, CTLFLAG_RDTUN, &msginfo.msgtql, 0, 1333 "Maximum number of messages in the system"); 1334 SYSCTL_INT(_kern_ipc, OID_AUTO, msgssz, CTLFLAG_RDTUN, &msginfo.msgssz, 0, 1335 "Size of a message segment"); 1336 SYSCTL_INT(_kern_ipc, OID_AUTO, msgseg, CTLFLAG_RDTUN, &msginfo.msgseg, 0, 1337 "Number of message segments"); 1338 SYSCTL_PROC(_kern_ipc, OID_AUTO, msqids, CTLTYPE_OPAQUE | CTLFLAG_RD, 1339 NULL, 0, sysctl_msqids, "", "Message queue IDs"); 1340 1341 #ifdef COMPAT_FREEBSD32 1342 int 1343 freebsd32_msgsys(struct thread *td, struct freebsd32_msgsys_args *uap) 1344 { 1345 1346 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1347 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1348 switch (uap->which) { 1349 case 0: 1350 return (freebsd7_freebsd32_msgctl(td, 1351 (struct freebsd7_freebsd32_msgctl_args *)&uap->a2)); 1352 case 2: 1353 return (freebsd32_msgsnd(td, 1354 (struct freebsd32_msgsnd_args *)&uap->a2)); 1355 case 3: 1356 return (freebsd32_msgrcv(td, 1357 (struct freebsd32_msgrcv_args *)&uap->a2)); 1358 default: 1359 return (msgsys(td, (struct msgsys_args *)uap)); 1360 } 1361 #else 1362 return (nosys(td, NULL)); 1363 #endif 1364 } 1365 1366 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1367 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1368 int 1369 freebsd7_freebsd32_msgctl(struct thread *td, 1370 struct freebsd7_freebsd32_msgctl_args *uap) 1371 { 1372 struct msqid_ds msqbuf; 1373 struct msqid_ds32_old msqbuf32; 1374 int error; 1375 1376 if (uap->cmd == IPC_SET) { 1377 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32)); 1378 if (error) 1379 return (error); 1380 freebsd32_ipcperm_old_in(&msqbuf32.msg_perm, &msqbuf.msg_perm); 1381 PTRIN_CP(msqbuf32, msqbuf, msg_first); 1382 PTRIN_CP(msqbuf32, msqbuf, msg_last); 1383 CP(msqbuf32, msqbuf, msg_cbytes); 1384 CP(msqbuf32, msqbuf, msg_qnum); 1385 CP(msqbuf32, msqbuf, msg_qbytes); 1386 CP(msqbuf32, msqbuf, msg_lspid); 1387 CP(msqbuf32, msqbuf, msg_lrpid); 1388 CP(msqbuf32, msqbuf, msg_stime); 1389 CP(msqbuf32, msqbuf, msg_rtime); 1390 CP(msqbuf32, msqbuf, msg_ctime); 1391 } 1392 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1393 if (error) 1394 return (error); 1395 if (uap->cmd == IPC_STAT) { 1396 bzero(&msqbuf32, sizeof(msqbuf32)); 1397 freebsd32_ipcperm_old_out(&msqbuf.msg_perm, &msqbuf32.msg_perm); 1398 PTROUT_CP(msqbuf, msqbuf32, msg_first); 1399 PTROUT_CP(msqbuf, msqbuf32, msg_last); 1400 CP(msqbuf, msqbuf32, msg_cbytes); 1401 CP(msqbuf, msqbuf32, msg_qnum); 1402 CP(msqbuf, msqbuf32, msg_qbytes); 1403 CP(msqbuf, msqbuf32, msg_lspid); 1404 CP(msqbuf, msqbuf32, msg_lrpid); 1405 CP(msqbuf, msqbuf32, msg_stime); 1406 CP(msqbuf, msqbuf32, msg_rtime); 1407 CP(msqbuf, msqbuf32, msg_ctime); 1408 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32)); 1409 } 1410 return (error); 1411 } 1412 #endif 1413 1414 int 1415 freebsd32_msgctl(struct thread *td, struct freebsd32_msgctl_args *uap) 1416 { 1417 struct msqid_ds msqbuf; 1418 struct msqid_ds32 msqbuf32; 1419 int error; 1420 1421 if (uap->cmd == IPC_SET) { 1422 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32)); 1423 if (error) 1424 return (error); 1425 freebsd32_ipcperm_in(&msqbuf32.msg_perm, &msqbuf.msg_perm); 1426 PTRIN_CP(msqbuf32, msqbuf, msg_first); 1427 PTRIN_CP(msqbuf32, msqbuf, msg_last); 1428 CP(msqbuf32, msqbuf, msg_cbytes); 1429 CP(msqbuf32, msqbuf, msg_qnum); 1430 CP(msqbuf32, msqbuf, msg_qbytes); 1431 CP(msqbuf32, msqbuf, msg_lspid); 1432 CP(msqbuf32, msqbuf, msg_lrpid); 1433 CP(msqbuf32, msqbuf, msg_stime); 1434 CP(msqbuf32, msqbuf, msg_rtime); 1435 CP(msqbuf32, msqbuf, msg_ctime); 1436 } 1437 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1438 if (error) 1439 return (error); 1440 if (uap->cmd == IPC_STAT) { 1441 freebsd32_ipcperm_out(&msqbuf.msg_perm, &msqbuf32.msg_perm); 1442 PTROUT_CP(msqbuf, msqbuf32, msg_first); 1443 PTROUT_CP(msqbuf, msqbuf32, msg_last); 1444 CP(msqbuf, msqbuf32, msg_cbytes); 1445 CP(msqbuf, msqbuf32, msg_qnum); 1446 CP(msqbuf, msqbuf32, msg_qbytes); 1447 CP(msqbuf, msqbuf32, msg_lspid); 1448 CP(msqbuf, msqbuf32, msg_lrpid); 1449 CP(msqbuf, msqbuf32, msg_stime); 1450 CP(msqbuf, msqbuf32, msg_rtime); 1451 CP(msqbuf, msqbuf32, msg_ctime); 1452 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32)); 1453 } 1454 return (error); 1455 } 1456 1457 int 1458 freebsd32_msgsnd(struct thread *td, struct freebsd32_msgsnd_args *uap) 1459 { 1460 const void *msgp; 1461 long mtype; 1462 int32_t mtype32; 1463 int error; 1464 1465 msgp = PTRIN(uap->msgp); 1466 if ((error = copyin(msgp, &mtype32, sizeof(mtype32))) != 0) 1467 return (error); 1468 mtype = mtype32; 1469 return (kern_msgsnd(td, uap->msqid, 1470 (const char *)msgp + sizeof(mtype32), 1471 uap->msgsz, uap->msgflg, mtype)); 1472 } 1473 1474 int 1475 freebsd32_msgrcv(struct thread *td, struct freebsd32_msgrcv_args *uap) 1476 { 1477 void *msgp; 1478 long mtype; 1479 int32_t mtype32; 1480 int error; 1481 1482 msgp = PTRIN(uap->msgp); 1483 if ((error = kern_msgrcv(td, uap->msqid, 1484 (char *)msgp + sizeof(mtype32), uap->msgsz, 1485 uap->msgtyp, uap->msgflg, &mtype)) != 0) 1486 return (error); 1487 mtype32 = (int32_t)mtype; 1488 return (copyout(&mtype32, msgp, sizeof(mtype32))); 1489 } 1490 #endif 1491 1492 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1493 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1494 1495 /* XXX casting to (sy_call_t *) is bogus, as usual. */ 1496 static sy_call_t *msgcalls[] = { 1497 (sy_call_t *)freebsd7_msgctl, (sy_call_t *)msgget, 1498 (sy_call_t *)msgsnd, (sy_call_t *)msgrcv 1499 }; 1500 1501 /* 1502 * Entry point for all MSG calls. 1503 */ 1504 int 1505 msgsys(td, uap) 1506 struct thread *td; 1507 /* XXX actually varargs. */ 1508 struct msgsys_args /* { 1509 int which; 1510 int a2; 1511 int a3; 1512 int a4; 1513 int a5; 1514 int a6; 1515 } */ *uap; 1516 { 1517 int error; 1518 1519 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 1520 return (ENOSYS); 1521 if (uap->which < 0 || 1522 uap->which >= sizeof(msgcalls)/sizeof(msgcalls[0])) 1523 return (EINVAL); 1524 error = (*msgcalls[uap->which])(td, &uap->a2); 1525 return (error); 1526 } 1527 1528 #ifndef CP 1529 #define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0) 1530 #endif 1531 1532 #ifndef _SYS_SYSPROTO_H_ 1533 struct freebsd7_msgctl_args { 1534 int msqid; 1535 int cmd; 1536 struct msqid_ds_old *buf; 1537 }; 1538 #endif 1539 int 1540 freebsd7_msgctl(td, uap) 1541 struct thread *td; 1542 struct freebsd7_msgctl_args *uap; 1543 { 1544 struct msqid_ds_old msqold; 1545 struct msqid_ds msqbuf; 1546 int error; 1547 1548 DPRINTF(("call to freebsd7_msgctl(%d, %d, %p)\n", uap->msqid, uap->cmd, 1549 uap->buf)); 1550 if (uap->cmd == IPC_SET) { 1551 error = copyin(uap->buf, &msqold, sizeof(msqold)); 1552 if (error) 1553 return (error); 1554 ipcperm_old2new(&msqold.msg_perm, &msqbuf.msg_perm); 1555 CP(msqold, msqbuf, msg_first); 1556 CP(msqold, msqbuf, msg_last); 1557 CP(msqold, msqbuf, msg_cbytes); 1558 CP(msqold, msqbuf, msg_qnum); 1559 CP(msqold, msqbuf, msg_qbytes); 1560 CP(msqold, msqbuf, msg_lspid); 1561 CP(msqold, msqbuf, msg_lrpid); 1562 CP(msqold, msqbuf, msg_stime); 1563 CP(msqold, msqbuf, msg_rtime); 1564 CP(msqold, msqbuf, msg_ctime); 1565 } 1566 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1567 if (error) 1568 return (error); 1569 if (uap->cmd == IPC_STAT) { 1570 bzero(&msqold, sizeof(msqold)); 1571 ipcperm_new2old(&msqbuf.msg_perm, &msqold.msg_perm); 1572 CP(msqbuf, msqold, msg_first); 1573 CP(msqbuf, msqold, msg_last); 1574 CP(msqbuf, msqold, msg_cbytes); 1575 CP(msqbuf, msqold, msg_qnum); 1576 CP(msqbuf, msqold, msg_qbytes); 1577 CP(msqbuf, msqold, msg_lspid); 1578 CP(msqbuf, msqold, msg_lrpid); 1579 CP(msqbuf, msqold, msg_stime); 1580 CP(msqbuf, msqold, msg_rtime); 1581 CP(msqbuf, msqold, msg_ctime); 1582 error = copyout(&msqold, uap->buf, sizeof(struct msqid_ds_old)); 1583 } 1584 return (error); 1585 } 1586 1587 #undef CP 1588 1589 #endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 || 1590 COMPAT_FREEBSD7 */ 1591