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 85 #ifdef MSG_DEBUG 86 #define DPRINTF(a) printf a 87 #else 88 #define DPRINTF(a) (void)0 89 #endif 90 91 static void msg_freehdr(struct msg *msghdr); 92 93 #ifndef MSGSSZ 94 #define MSGSSZ 8 /* Each segment must be 2^N long */ 95 #endif 96 #ifndef MSGSEG 97 #define MSGSEG 2048 /* must be less than 32767 */ 98 #endif 99 #define MSGMAX (MSGSSZ*MSGSEG) 100 #ifndef MSGMNB 101 #define MSGMNB 2048 /* max # of bytes in a queue */ 102 #endif 103 #ifndef MSGMNI 104 #define MSGMNI 40 105 #endif 106 #ifndef MSGTQL 107 #define MSGTQL 40 108 #endif 109 110 /* 111 * Based on the configuration parameters described in an SVR2 (yes, two) 112 * config(1m) man page. 113 * 114 * Each message is broken up and stored in segments that are msgssz bytes 115 * long. For efficiency reasons, this should be a power of two. Also, 116 * it doesn't make sense if it is less than 8 or greater than about 256. 117 * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of 118 * two between 8 and 1024 inclusive (and panic's if it isn't). 119 */ 120 struct msginfo msginfo = { 121 MSGMAX, /* max chars in a message */ 122 MSGMNI, /* # of message queue identifiers */ 123 MSGMNB, /* max chars in a queue */ 124 MSGTQL, /* max messages in system */ 125 MSGSSZ, /* size of a message segment */ 126 /* (must be small power of 2 greater than 4) */ 127 MSGSEG /* number of message segments */ 128 }; 129 130 /* 131 * macros to convert between msqid_ds's and msqid's. 132 * (specific to this implementation) 133 */ 134 #define MSQID(ix,ds) ((ix) & 0xffff | (((ds).msg_perm.seq << 16) & 0xffff0000)) 135 #define MSQID_IX(id) ((id) & 0xffff) 136 #define MSQID_SEQ(id) (((id) >> 16) & 0xffff) 137 138 /* 139 * The rest of this file is specific to this particular implementation. 140 */ 141 142 struct msgmap { 143 short next; /* next segment in buffer */ 144 /* -1 -> available */ 145 /* 0..(MSGSEG-1) -> index of next segment */ 146 }; 147 148 #define MSG_LOCKED 01000 /* Is this msqid_ds locked? */ 149 150 static int nfree_msgmaps; /* # of free map entries */ 151 static short free_msgmaps; /* head of linked list of free map entries */ 152 static struct msg *free_msghdrs;/* list of free msg headers */ 153 static char *msgpool; /* MSGMAX byte long msg buffer pool */ 154 static struct msgmap *msgmaps; /* MSGSEG msgmap structures */ 155 static struct msg *msghdrs; /* MSGTQL msg headers */ 156 static struct msqid_kernel *msqids; /* MSGMNI msqid_kernel struct's */ 157 static struct mtx msq_mtx; /* global mutex for message queues. */ 158 159 static struct syscall_helper_data msg_syscalls[] = { 160 SYSCALL_INIT_HELPER(msgctl), 161 SYSCALL_INIT_HELPER(msgget), 162 SYSCALL_INIT_HELPER(msgsnd), 163 SYSCALL_INIT_HELPER(msgrcv), 164 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 165 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 166 SYSCALL_INIT_HELPER(msgsys), 167 SYSCALL_INIT_HELPER_COMPAT(freebsd7_msgctl), 168 #endif 169 SYSCALL_INIT_LAST 170 }; 171 172 #ifdef COMPAT_FREEBSD32 173 #include <compat/freebsd32/freebsd32.h> 174 #include <compat/freebsd32/freebsd32_ipc.h> 175 #include <compat/freebsd32/freebsd32_proto.h> 176 #include <compat/freebsd32/freebsd32_signal.h> 177 #include <compat/freebsd32/freebsd32_syscall.h> 178 #include <compat/freebsd32/freebsd32_util.h> 179 180 static struct syscall_helper_data msg32_syscalls[] = { 181 SYSCALL32_INIT_HELPER(freebsd32_msgctl), 182 SYSCALL32_INIT_HELPER(freebsd32_msgsnd), 183 SYSCALL32_INIT_HELPER(freebsd32_msgrcv), 184 SYSCALL32_INIT_HELPER_COMPAT(msgget), 185 SYSCALL32_INIT_HELPER(freebsd32_msgsys), 186 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 187 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 188 SYSCALL32_INIT_HELPER(freebsd7_freebsd32_msgctl), 189 #endif 190 SYSCALL_INIT_LAST 191 }; 192 #endif 193 194 static int 195 msginit() 196 { 197 int i, error; 198 199 TUNABLE_INT_FETCH("kern.ipc.msgseg", &msginfo.msgseg); 200 TUNABLE_INT_FETCH("kern.ipc.msgssz", &msginfo.msgssz); 201 msginfo.msgmax = msginfo.msgseg * msginfo.msgssz; 202 TUNABLE_INT_FETCH("kern.ipc.msgmni", &msginfo.msgmni); 203 TUNABLE_INT_FETCH("kern.ipc.msgmnb", &msginfo.msgmnb); 204 TUNABLE_INT_FETCH("kern.ipc.msgtql", &msginfo.msgtql); 205 206 msgpool = malloc(msginfo.msgmax, M_MSG, M_WAITOK); 207 msgmaps = malloc(sizeof(struct msgmap) * msginfo.msgseg, M_MSG, M_WAITOK); 208 msghdrs = malloc(sizeof(struct msg) * msginfo.msgtql, M_MSG, M_WAITOK); 209 msqids = malloc(sizeof(struct msqid_kernel) * msginfo.msgmni, M_MSG, 210 M_WAITOK); 211 212 /* 213 * msginfo.msgssz should be a power of two for efficiency reasons. 214 * It is also pretty silly if msginfo.msgssz is less than 8 215 * or greater than about 256 so ... 216 */ 217 218 i = 8; 219 while (i < 1024 && i != msginfo.msgssz) 220 i <<= 1; 221 if (i != msginfo.msgssz) { 222 DPRINTF(("msginfo.msgssz=%d (0x%x)\n", msginfo.msgssz, 223 msginfo.msgssz)); 224 panic("msginfo.msgssz not a small power of 2"); 225 } 226 227 if (msginfo.msgseg > 32767) { 228 DPRINTF(("msginfo.msgseg=%d\n", msginfo.msgseg)); 229 panic("msginfo.msgseg > 32767"); 230 } 231 232 for (i = 0; i < msginfo.msgseg; i++) { 233 if (i > 0) 234 msgmaps[i-1].next = i; 235 msgmaps[i].next = -1; /* implies entry is available */ 236 } 237 free_msgmaps = 0; 238 nfree_msgmaps = msginfo.msgseg; 239 240 for (i = 0; i < msginfo.msgtql; i++) { 241 msghdrs[i].msg_type = 0; 242 if (i > 0) 243 msghdrs[i-1].msg_next = &msghdrs[i]; 244 msghdrs[i].msg_next = NULL; 245 #ifdef MAC 246 mac_sysvmsg_init(&msghdrs[i]); 247 #endif 248 } 249 free_msghdrs = &msghdrs[0]; 250 251 for (i = 0; i < msginfo.msgmni; i++) { 252 msqids[i].u.msg_qbytes = 0; /* implies entry is available */ 253 msqids[i].u.msg_perm.seq = 0; /* reset to a known value */ 254 msqids[i].u.msg_perm.mode = 0; 255 #ifdef MAC 256 mac_sysvmsq_init(&msqids[i]); 257 #endif 258 } 259 mtx_init(&msq_mtx, "msq", NULL, MTX_DEF); 260 261 error = syscall_helper_register(msg_syscalls); 262 if (error != 0) 263 return (error); 264 #ifdef COMPAT_FREEBSD32 265 error = syscall32_helper_register(msg32_syscalls); 266 if (error != 0) 267 return (error); 268 #endif 269 return (0); 270 } 271 272 static int 273 msgunload() 274 { 275 struct msqid_kernel *msqkptr; 276 int msqid; 277 #ifdef MAC 278 int i; 279 #endif 280 281 syscall_helper_unregister(msg_syscalls); 282 #ifdef COMPAT_FREEBSD32 283 syscall32_helper_unregister(msg32_syscalls); 284 #endif 285 286 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 287 /* 288 * Look for an unallocated and unlocked msqid_ds. 289 * msqid_ds's can be locked by msgsnd or msgrcv while 290 * they are copying the message in/out. We can't 291 * re-use the entry until they release it. 292 */ 293 msqkptr = &msqids[msqid]; 294 if (msqkptr->u.msg_qbytes != 0 || 295 (msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) 296 break; 297 } 298 if (msqid != msginfo.msgmni) 299 return (EBUSY); 300 301 #ifdef MAC 302 for (i = 0; i < msginfo.msgtql; i++) 303 mac_sysvmsg_destroy(&msghdrs[i]); 304 for (msqid = 0; msqid < msginfo.msgmni; msqid++) 305 mac_sysvmsq_destroy(&msqids[msqid]); 306 #endif 307 free(msgpool, M_MSG); 308 free(msgmaps, M_MSG); 309 free(msghdrs, M_MSG); 310 free(msqids, M_MSG); 311 mtx_destroy(&msq_mtx); 312 return (0); 313 } 314 315 316 static int 317 sysvmsg_modload(struct module *module, int cmd, void *arg) 318 { 319 int error = 0; 320 321 switch (cmd) { 322 case MOD_LOAD: 323 error = msginit(); 324 if (error != 0) 325 msgunload(); 326 break; 327 case MOD_UNLOAD: 328 error = msgunload(); 329 break; 330 case MOD_SHUTDOWN: 331 break; 332 default: 333 error = EINVAL; 334 break; 335 } 336 return (error); 337 } 338 339 static moduledata_t sysvmsg_mod = { 340 "sysvmsg", 341 &sysvmsg_modload, 342 NULL 343 }; 344 345 DECLARE_MODULE(sysvmsg, sysvmsg_mod, SI_SUB_SYSV_MSG, SI_ORDER_FIRST); 346 MODULE_VERSION(sysvmsg, 1); 347 348 static void 349 msg_freehdr(msghdr) 350 struct msg *msghdr; 351 { 352 while (msghdr->msg_ts > 0) { 353 short next; 354 if (msghdr->msg_spot < 0 || msghdr->msg_spot >= msginfo.msgseg) 355 panic("msghdr->msg_spot out of range"); 356 next = msgmaps[msghdr->msg_spot].next; 357 msgmaps[msghdr->msg_spot].next = free_msgmaps; 358 free_msgmaps = msghdr->msg_spot; 359 nfree_msgmaps++; 360 msghdr->msg_spot = next; 361 if (msghdr->msg_ts >= msginfo.msgssz) 362 msghdr->msg_ts -= msginfo.msgssz; 363 else 364 msghdr->msg_ts = 0; 365 } 366 if (msghdr->msg_spot != -1) 367 panic("msghdr->msg_spot != -1"); 368 msghdr->msg_next = free_msghdrs; 369 free_msghdrs = msghdr; 370 #ifdef MAC 371 mac_sysvmsg_cleanup(msghdr); 372 #endif 373 } 374 375 #ifndef _SYS_SYSPROTO_H_ 376 struct msgctl_args { 377 int msqid; 378 int cmd; 379 struct msqid_ds *buf; 380 }; 381 #endif 382 int 383 sys_msgctl(td, uap) 384 struct thread *td; 385 register struct msgctl_args *uap; 386 { 387 int msqid = uap->msqid; 388 int cmd = uap->cmd; 389 struct msqid_ds msqbuf; 390 int error; 391 392 DPRINTF(("call to msgctl(%d, %d, %p)\n", msqid, cmd, uap->buf)); 393 if (cmd == IPC_SET && 394 (error = copyin(uap->buf, &msqbuf, sizeof(msqbuf))) != 0) 395 return (error); 396 error = kern_msgctl(td, msqid, cmd, &msqbuf); 397 if (cmd == IPC_STAT && error == 0) 398 error = copyout(&msqbuf, uap->buf, sizeof(struct msqid_ds)); 399 return (error); 400 } 401 402 int 403 kern_msgctl(td, msqid, cmd, msqbuf) 404 struct thread *td; 405 int msqid; 406 int cmd; 407 struct msqid_ds *msqbuf; 408 { 409 int rval, error, msqix; 410 register struct msqid_kernel *msqkptr; 411 412 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 413 return (ENOSYS); 414 415 msqix = IPCID_TO_IX(msqid); 416 417 if (msqix < 0 || msqix >= msginfo.msgmni) { 418 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 419 msginfo.msgmni)); 420 return (EINVAL); 421 } 422 423 msqkptr = &msqids[msqix]; 424 425 mtx_lock(&msq_mtx); 426 if (msqkptr->u.msg_qbytes == 0) { 427 DPRINTF(("no such msqid\n")); 428 error = EINVAL; 429 goto done2; 430 } 431 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 432 DPRINTF(("wrong sequence number\n")); 433 error = EINVAL; 434 goto done2; 435 } 436 #ifdef MAC 437 error = mac_sysvmsq_check_msqctl(td->td_ucred, msqkptr, cmd); 438 if (error != 0) 439 goto done2; 440 #endif 441 442 error = 0; 443 rval = 0; 444 445 switch (cmd) { 446 447 case IPC_RMID: 448 { 449 struct msg *msghdr; 450 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M))) 451 goto done2; 452 453 #ifdef MAC 454 /* 455 * Check that the thread has MAC access permissions to 456 * individual msghdrs. Note: We need to do this in a 457 * separate loop because the actual loop alters the 458 * msq/msghdr info as it progresses, and there is no going 459 * back if half the way through we discover that the 460 * thread cannot free a certain msghdr. The msq will get 461 * into an inconsistent state. 462 */ 463 for (msghdr = msqkptr->u.msg_first; msghdr != NULL; 464 msghdr = msghdr->msg_next) { 465 error = mac_sysvmsq_check_msgrmid(td->td_ucred, msghdr); 466 if (error != 0) 467 goto done2; 468 } 469 #endif 470 471 racct_sub_cred(msqkptr->cred, RACCT_NMSGQ, 1); 472 racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, msqkptr->u.msg_qnum); 473 racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msqkptr->u.msg_cbytes); 474 crfree(msqkptr->cred); 475 msqkptr->cred = NULL; 476 477 /* Free the message headers */ 478 msghdr = msqkptr->u.msg_first; 479 while (msghdr != NULL) { 480 struct msg *msghdr_tmp; 481 482 /* Free the segments of each message */ 483 msqkptr->u.msg_cbytes -= msghdr->msg_ts; 484 msqkptr->u.msg_qnum--; 485 msghdr_tmp = msghdr; 486 msghdr = msghdr->msg_next; 487 msg_freehdr(msghdr_tmp); 488 } 489 490 if (msqkptr->u.msg_cbytes != 0) 491 panic("msg_cbytes is screwed up"); 492 if (msqkptr->u.msg_qnum != 0) 493 panic("msg_qnum is screwed up"); 494 495 msqkptr->u.msg_qbytes = 0; /* Mark it as free */ 496 497 #ifdef MAC 498 mac_sysvmsq_cleanup(msqkptr); 499 #endif 500 501 wakeup(msqkptr); 502 } 503 504 break; 505 506 case IPC_SET: 507 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M))) 508 goto done2; 509 if (msqbuf->msg_qbytes > msqkptr->u.msg_qbytes) { 510 error = priv_check(td, PRIV_IPC_MSGSIZE); 511 if (error) 512 goto done2; 513 } 514 if (msqbuf->msg_qbytes > msginfo.msgmnb) { 515 DPRINTF(("can't increase msg_qbytes beyond %d" 516 "(truncating)\n", msginfo.msgmnb)); 517 msqbuf->msg_qbytes = msginfo.msgmnb; /* silently restrict qbytes to system limit */ 518 } 519 if (msqbuf->msg_qbytes == 0) { 520 DPRINTF(("can't reduce msg_qbytes to 0\n")); 521 error = EINVAL; /* non-standard errno! */ 522 goto done2; 523 } 524 msqkptr->u.msg_perm.uid = msqbuf->msg_perm.uid; /* change the owner */ 525 msqkptr->u.msg_perm.gid = msqbuf->msg_perm.gid; /* change the owner */ 526 msqkptr->u.msg_perm.mode = (msqkptr->u.msg_perm.mode & ~0777) | 527 (msqbuf->msg_perm.mode & 0777); 528 msqkptr->u.msg_qbytes = msqbuf->msg_qbytes; 529 msqkptr->u.msg_ctime = time_second; 530 break; 531 532 case IPC_STAT: 533 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) { 534 DPRINTF(("requester doesn't have read access\n")); 535 goto done2; 536 } 537 *msqbuf = msqkptr->u; 538 break; 539 540 default: 541 DPRINTF(("invalid command %d\n", cmd)); 542 error = EINVAL; 543 goto done2; 544 } 545 546 if (error == 0) 547 td->td_retval[0] = rval; 548 done2: 549 mtx_unlock(&msq_mtx); 550 return (error); 551 } 552 553 #ifndef _SYS_SYSPROTO_H_ 554 struct msgget_args { 555 key_t key; 556 int msgflg; 557 }; 558 #endif 559 560 int 561 sys_msgget(td, uap) 562 struct thread *td; 563 register struct msgget_args *uap; 564 { 565 int msqid, error = 0; 566 int key = uap->key; 567 int msgflg = uap->msgflg; 568 struct ucred *cred = td->td_ucred; 569 register struct msqid_kernel *msqkptr = NULL; 570 571 DPRINTF(("msgget(0x%x, 0%o)\n", key, msgflg)); 572 573 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 574 return (ENOSYS); 575 576 mtx_lock(&msq_mtx); 577 if (key != IPC_PRIVATE) { 578 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 579 msqkptr = &msqids[msqid]; 580 if (msqkptr->u.msg_qbytes != 0 && 581 msqkptr->u.msg_perm.key == key) 582 break; 583 } 584 if (msqid < msginfo.msgmni) { 585 DPRINTF(("found public key\n")); 586 if ((msgflg & IPC_CREAT) && (msgflg & IPC_EXCL)) { 587 DPRINTF(("not exclusive\n")); 588 error = EEXIST; 589 goto done2; 590 } 591 if ((error = ipcperm(td, &msqkptr->u.msg_perm, 592 msgflg & 0700))) { 593 DPRINTF(("requester doesn't have 0%o access\n", 594 msgflg & 0700)); 595 goto done2; 596 } 597 #ifdef MAC 598 error = mac_sysvmsq_check_msqget(cred, msqkptr); 599 if (error != 0) 600 goto done2; 601 #endif 602 goto found; 603 } 604 } 605 606 DPRINTF(("need to allocate the msqid_ds\n")); 607 if (key == IPC_PRIVATE || (msgflg & IPC_CREAT)) { 608 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 609 /* 610 * Look for an unallocated and unlocked msqid_ds. 611 * msqid_ds's can be locked by msgsnd or msgrcv while 612 * they are copying the message in/out. We can't 613 * re-use the entry until they release it. 614 */ 615 msqkptr = &msqids[msqid]; 616 if (msqkptr->u.msg_qbytes == 0 && 617 (msqkptr->u.msg_perm.mode & MSG_LOCKED) == 0) 618 break; 619 } 620 if (msqid == msginfo.msgmni) { 621 DPRINTF(("no more msqid_ds's available\n")); 622 error = ENOSPC; 623 goto done2; 624 } 625 #ifdef RACCT 626 PROC_LOCK(td->td_proc); 627 error = racct_add(td->td_proc, RACCT_NMSGQ, 1); 628 PROC_UNLOCK(td->td_proc); 629 if (error != 0) { 630 error = ENOSPC; 631 goto done2; 632 } 633 #endif 634 DPRINTF(("msqid %d is available\n", msqid)); 635 msqkptr->u.msg_perm.key = key; 636 msqkptr->u.msg_perm.cuid = cred->cr_uid; 637 msqkptr->u.msg_perm.uid = cred->cr_uid; 638 msqkptr->u.msg_perm.cgid = cred->cr_gid; 639 msqkptr->u.msg_perm.gid = cred->cr_gid; 640 msqkptr->u.msg_perm.mode = (msgflg & 0777); 641 msqkptr->cred = crhold(cred); 642 /* Make sure that the returned msqid is unique */ 643 msqkptr->u.msg_perm.seq = (msqkptr->u.msg_perm.seq + 1) & 0x7fff; 644 msqkptr->u.msg_first = NULL; 645 msqkptr->u.msg_last = NULL; 646 msqkptr->u.msg_cbytes = 0; 647 msqkptr->u.msg_qnum = 0; 648 msqkptr->u.msg_qbytes = msginfo.msgmnb; 649 msqkptr->u.msg_lspid = 0; 650 msqkptr->u.msg_lrpid = 0; 651 msqkptr->u.msg_stime = 0; 652 msqkptr->u.msg_rtime = 0; 653 msqkptr->u.msg_ctime = time_second; 654 #ifdef MAC 655 mac_sysvmsq_create(cred, msqkptr); 656 #endif 657 } else { 658 DPRINTF(("didn't find it and wasn't asked to create it\n")); 659 error = ENOENT; 660 goto done2; 661 } 662 663 found: 664 /* Construct the unique msqid */ 665 td->td_retval[0] = IXSEQ_TO_IPCID(msqid, msqkptr->u.msg_perm); 666 done2: 667 mtx_unlock(&msq_mtx); 668 return (error); 669 } 670 671 #ifndef _SYS_SYSPROTO_H_ 672 struct msgsnd_args { 673 int msqid; 674 const void *msgp; 675 size_t msgsz; 676 int msgflg; 677 }; 678 #endif 679 int 680 kern_msgsnd(td, msqid, msgp, msgsz, msgflg, mtype) 681 struct thread *td; 682 int msqid; 683 const void *msgp; /* XXX msgp is actually mtext. */ 684 size_t msgsz; 685 int msgflg; 686 long mtype; 687 { 688 int msqix, segs_needed, error = 0; 689 register struct msqid_kernel *msqkptr; 690 register struct msg *msghdr; 691 short next; 692 #ifdef RACCT 693 size_t saved_msgsz; 694 #endif 695 696 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 697 return (ENOSYS); 698 699 mtx_lock(&msq_mtx); 700 msqix = IPCID_TO_IX(msqid); 701 702 if (msqix < 0 || msqix >= msginfo.msgmni) { 703 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 704 msginfo.msgmni)); 705 error = EINVAL; 706 goto done2; 707 } 708 709 msqkptr = &msqids[msqix]; 710 if (msqkptr->u.msg_qbytes == 0) { 711 DPRINTF(("no such message queue id\n")); 712 error = EINVAL; 713 goto done2; 714 } 715 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 716 DPRINTF(("wrong sequence number\n")); 717 error = EINVAL; 718 goto done2; 719 } 720 721 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_W))) { 722 DPRINTF(("requester doesn't have write access\n")); 723 goto done2; 724 } 725 726 #ifdef MAC 727 error = mac_sysvmsq_check_msqsnd(td->td_ucred, msqkptr); 728 if (error != 0) 729 goto done2; 730 #endif 731 732 #ifdef RACCT 733 PROC_LOCK(td->td_proc); 734 if (racct_add(td->td_proc, RACCT_MSGQQUEUED, 1)) { 735 PROC_UNLOCK(td->td_proc); 736 error = EAGAIN; 737 goto done2; 738 } 739 saved_msgsz = msgsz; 740 if (racct_add(td->td_proc, RACCT_MSGQSIZE, msgsz)) { 741 racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1); 742 PROC_UNLOCK(td->td_proc); 743 error = EAGAIN; 744 goto done2; 745 } 746 PROC_UNLOCK(td->td_proc); 747 #endif 748 749 segs_needed = (msgsz + msginfo.msgssz - 1) / msginfo.msgssz; 750 DPRINTF(("msgsz=%zu, msgssz=%d, segs_needed=%d\n", msgsz, 751 msginfo.msgssz, segs_needed)); 752 for (;;) { 753 int need_more_resources = 0; 754 755 /* 756 * check msgsz 757 * (inside this loop in case msg_qbytes changes while we sleep) 758 */ 759 760 if (msgsz > msqkptr->u.msg_qbytes) { 761 DPRINTF(("msgsz > msqkptr->u.msg_qbytes\n")); 762 error = EINVAL; 763 goto done3; 764 } 765 766 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) { 767 DPRINTF(("msqid is locked\n")); 768 need_more_resources = 1; 769 } 770 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) { 771 DPRINTF(("msgsz + msg_cbytes > msg_qbytes\n")); 772 need_more_resources = 1; 773 } 774 if (segs_needed > nfree_msgmaps) { 775 DPRINTF(("segs_needed > nfree_msgmaps\n")); 776 need_more_resources = 1; 777 } 778 if (free_msghdrs == NULL) { 779 DPRINTF(("no more msghdrs\n")); 780 need_more_resources = 1; 781 } 782 783 if (need_more_resources) { 784 int we_own_it; 785 786 if ((msgflg & IPC_NOWAIT) != 0) { 787 DPRINTF(("need more resources but caller " 788 "doesn't want to wait\n")); 789 error = EAGAIN; 790 goto done3; 791 } 792 793 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) { 794 DPRINTF(("we don't own the msqid_ds\n")); 795 we_own_it = 0; 796 } else { 797 /* Force later arrivals to wait for our 798 request */ 799 DPRINTF(("we own the msqid_ds\n")); 800 msqkptr->u.msg_perm.mode |= MSG_LOCKED; 801 we_own_it = 1; 802 } 803 DPRINTF(("msgsnd: goodnight\n")); 804 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH, 805 "msgsnd", hz); 806 DPRINTF(("msgsnd: good morning, error=%d\n", error)); 807 if (we_own_it) 808 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 809 if (error == EWOULDBLOCK) { 810 DPRINTF(("msgsnd: timed out\n")); 811 continue; 812 } 813 if (error != 0) { 814 DPRINTF(("msgsnd: interrupted system call\n")); 815 error = EINTR; 816 goto done3; 817 } 818 819 /* 820 * Make sure that the msq queue still exists 821 */ 822 823 if (msqkptr->u.msg_qbytes == 0) { 824 DPRINTF(("msqid deleted\n")); 825 error = EIDRM; 826 goto done3; 827 } 828 829 } else { 830 DPRINTF(("got all the resources that we need\n")); 831 break; 832 } 833 } 834 835 /* 836 * We have the resources that we need. 837 * Make sure! 838 */ 839 840 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) 841 panic("msg_perm.mode & MSG_LOCKED"); 842 if (segs_needed > nfree_msgmaps) 843 panic("segs_needed > nfree_msgmaps"); 844 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) 845 panic("msgsz + msg_cbytes > msg_qbytes"); 846 if (free_msghdrs == NULL) 847 panic("no more msghdrs"); 848 849 /* 850 * Re-lock the msqid_ds in case we page-fault when copying in the 851 * message 852 */ 853 854 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) 855 panic("msqid_ds is already locked"); 856 msqkptr->u.msg_perm.mode |= MSG_LOCKED; 857 858 /* 859 * Allocate a message header 860 */ 861 862 msghdr = free_msghdrs; 863 free_msghdrs = msghdr->msg_next; 864 msghdr->msg_spot = -1; 865 msghdr->msg_ts = msgsz; 866 msghdr->msg_type = mtype; 867 #ifdef MAC 868 /* 869 * XXXMAC: Should the mac_sysvmsq_check_msgmsq check follow here 870 * immediately? Or, should it be checked just before the msg is 871 * enqueued in the msgq (as it is done now)? 872 */ 873 mac_sysvmsg_create(td->td_ucred, msqkptr, msghdr); 874 #endif 875 876 /* 877 * Allocate space for the message 878 */ 879 880 while (segs_needed > 0) { 881 if (nfree_msgmaps <= 0) 882 panic("not enough msgmaps"); 883 if (free_msgmaps == -1) 884 panic("nil free_msgmaps"); 885 next = free_msgmaps; 886 if (next <= -1) 887 panic("next too low #1"); 888 if (next >= msginfo.msgseg) 889 panic("next out of range #1"); 890 DPRINTF(("allocating segment %d to message\n", next)); 891 free_msgmaps = msgmaps[next].next; 892 nfree_msgmaps--; 893 msgmaps[next].next = msghdr->msg_spot; 894 msghdr->msg_spot = next; 895 segs_needed--; 896 } 897 898 /* 899 * Validate the message type 900 */ 901 902 if (msghdr->msg_type < 1) { 903 msg_freehdr(msghdr); 904 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 905 wakeup(msqkptr); 906 DPRINTF(("mtype (%ld) < 1\n", msghdr->msg_type)); 907 error = EINVAL; 908 goto done3; 909 } 910 911 /* 912 * Copy in the message body 913 */ 914 915 next = msghdr->msg_spot; 916 while (msgsz > 0) { 917 size_t tlen; 918 if (msgsz > msginfo.msgssz) 919 tlen = msginfo.msgssz; 920 else 921 tlen = msgsz; 922 if (next <= -1) 923 panic("next too low #2"); 924 if (next >= msginfo.msgseg) 925 panic("next out of range #2"); 926 mtx_unlock(&msq_mtx); 927 if ((error = copyin(msgp, &msgpool[next * msginfo.msgssz], 928 tlen)) != 0) { 929 mtx_lock(&msq_mtx); 930 DPRINTF(("error %d copying in message segment\n", 931 error)); 932 msg_freehdr(msghdr); 933 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 934 wakeup(msqkptr); 935 goto done3; 936 } 937 mtx_lock(&msq_mtx); 938 msgsz -= tlen; 939 msgp = (const char *)msgp + tlen; 940 next = msgmaps[next].next; 941 } 942 if (next != -1) 943 panic("didn't use all the msg segments"); 944 945 /* 946 * We've got the message. Unlock the msqid_ds. 947 */ 948 949 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 950 951 /* 952 * Make sure that the msqid_ds is still allocated. 953 */ 954 955 if (msqkptr->u.msg_qbytes == 0) { 956 msg_freehdr(msghdr); 957 wakeup(msqkptr); 958 error = EIDRM; 959 goto done3; 960 } 961 962 #ifdef MAC 963 /* 964 * Note: Since the task/thread allocates the msghdr and usually 965 * primes it with its own MAC label, for a majority of policies, it 966 * won't be necessary to check whether the msghdr has access 967 * permissions to the msgq. The mac_sysvmsq_check_msqsnd check would 968 * suffice in that case. However, this hook may be required where 969 * individual policies derive a non-identical label for the msghdr 970 * from the current thread label and may want to check the msghdr 971 * enqueue permissions, along with read/write permissions to the 972 * msgq. 973 */ 974 error = mac_sysvmsq_check_msgmsq(td->td_ucred, msghdr, msqkptr); 975 if (error != 0) { 976 msg_freehdr(msghdr); 977 wakeup(msqkptr); 978 goto done3; 979 } 980 #endif 981 982 /* 983 * Put the message into the queue 984 */ 985 if (msqkptr->u.msg_first == NULL) { 986 msqkptr->u.msg_first = msghdr; 987 msqkptr->u.msg_last = msghdr; 988 } else { 989 msqkptr->u.msg_last->msg_next = msghdr; 990 msqkptr->u.msg_last = msghdr; 991 } 992 msqkptr->u.msg_last->msg_next = NULL; 993 994 msqkptr->u.msg_cbytes += msghdr->msg_ts; 995 msqkptr->u.msg_qnum++; 996 msqkptr->u.msg_lspid = td->td_proc->p_pid; 997 msqkptr->u.msg_stime = time_second; 998 999 wakeup(msqkptr); 1000 td->td_retval[0] = 0; 1001 done3: 1002 #ifdef RACCT 1003 if (error != 0) { 1004 PROC_LOCK(td->td_proc); 1005 racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1); 1006 racct_sub(td->td_proc, RACCT_MSGQSIZE, saved_msgsz); 1007 PROC_UNLOCK(td->td_proc); 1008 } 1009 #endif 1010 done2: 1011 mtx_unlock(&msq_mtx); 1012 return (error); 1013 } 1014 1015 int 1016 sys_msgsnd(td, uap) 1017 struct thread *td; 1018 register struct msgsnd_args *uap; 1019 { 1020 int error; 1021 long mtype; 1022 1023 DPRINTF(("call to msgsnd(%d, %p, %zu, %d)\n", uap->msqid, uap->msgp, 1024 uap->msgsz, uap->msgflg)); 1025 1026 if ((error = copyin(uap->msgp, &mtype, sizeof(mtype))) != 0) { 1027 DPRINTF(("error %d copying the message type\n", error)); 1028 return (error); 1029 } 1030 return (kern_msgsnd(td, uap->msqid, 1031 (const char *)uap->msgp + sizeof(mtype), 1032 uap->msgsz, uap->msgflg, mtype)); 1033 } 1034 1035 #ifndef _SYS_SYSPROTO_H_ 1036 struct msgrcv_args { 1037 int msqid; 1038 void *msgp; 1039 size_t msgsz; 1040 long msgtyp; 1041 int msgflg; 1042 }; 1043 #endif 1044 int 1045 kern_msgrcv(td, msqid, msgp, msgsz, msgtyp, msgflg, mtype) 1046 struct thread *td; 1047 int msqid; 1048 void *msgp; /* XXX msgp is actually mtext. */ 1049 size_t msgsz; 1050 long msgtyp; 1051 int msgflg; 1052 long *mtype; 1053 { 1054 size_t len; 1055 register struct msqid_kernel *msqkptr; 1056 register struct msg *msghdr; 1057 int msqix, error = 0; 1058 short next; 1059 1060 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 1061 return (ENOSYS); 1062 1063 msqix = IPCID_TO_IX(msqid); 1064 1065 if (msqix < 0 || msqix >= msginfo.msgmni) { 1066 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 1067 msginfo.msgmni)); 1068 return (EINVAL); 1069 } 1070 1071 msqkptr = &msqids[msqix]; 1072 mtx_lock(&msq_mtx); 1073 if (msqkptr->u.msg_qbytes == 0) { 1074 DPRINTF(("no such message queue id\n")); 1075 error = EINVAL; 1076 goto done2; 1077 } 1078 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 1079 DPRINTF(("wrong sequence number\n")); 1080 error = EINVAL; 1081 goto done2; 1082 } 1083 1084 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) { 1085 DPRINTF(("requester doesn't have read access\n")); 1086 goto done2; 1087 } 1088 1089 #ifdef MAC 1090 error = mac_sysvmsq_check_msqrcv(td->td_ucred, msqkptr); 1091 if (error != 0) 1092 goto done2; 1093 #endif 1094 1095 msghdr = NULL; 1096 while (msghdr == NULL) { 1097 if (msgtyp == 0) { 1098 msghdr = msqkptr->u.msg_first; 1099 if (msghdr != NULL) { 1100 if (msgsz < msghdr->msg_ts && 1101 (msgflg & MSG_NOERROR) == 0) { 1102 DPRINTF(("first message on the queue " 1103 "is too big (want %zu, got %d)\n", 1104 msgsz, msghdr->msg_ts)); 1105 error = E2BIG; 1106 goto done2; 1107 } 1108 #ifdef MAC 1109 error = mac_sysvmsq_check_msgrcv(td->td_ucred, 1110 msghdr); 1111 if (error != 0) 1112 goto done2; 1113 #endif 1114 if (msqkptr->u.msg_first == msqkptr->u.msg_last) { 1115 msqkptr->u.msg_first = NULL; 1116 msqkptr->u.msg_last = NULL; 1117 } else { 1118 msqkptr->u.msg_first = msghdr->msg_next; 1119 if (msqkptr->u.msg_first == NULL) 1120 panic("msg_first/last screwed up #1"); 1121 } 1122 } 1123 } else { 1124 struct msg *previous; 1125 struct msg **prev; 1126 1127 previous = NULL; 1128 prev = &(msqkptr->u.msg_first); 1129 while ((msghdr = *prev) != NULL) { 1130 /* 1131 * Is this message's type an exact match or is 1132 * this message's type less than or equal to 1133 * the absolute value of a negative msgtyp? 1134 * Note that the second half of this test can 1135 * NEVER be true if msgtyp is positive since 1136 * msg_type is always positive! 1137 */ 1138 1139 if (msgtyp == msghdr->msg_type || 1140 msghdr->msg_type <= -msgtyp) { 1141 DPRINTF(("found message type %ld, " 1142 "requested %ld\n", 1143 msghdr->msg_type, msgtyp)); 1144 if (msgsz < msghdr->msg_ts && 1145 (msgflg & MSG_NOERROR) == 0) { 1146 DPRINTF(("requested message " 1147 "on the queue is too big " 1148 "(want %zu, got %hu)\n", 1149 msgsz, msghdr->msg_ts)); 1150 error = E2BIG; 1151 goto done2; 1152 } 1153 #ifdef MAC 1154 error = mac_sysvmsq_check_msgrcv( 1155 td->td_ucred, msghdr); 1156 if (error != 0) 1157 goto done2; 1158 #endif 1159 *prev = msghdr->msg_next; 1160 if (msghdr == msqkptr->u.msg_last) { 1161 if (previous == NULL) { 1162 if (prev != 1163 &msqkptr->u.msg_first) 1164 panic("msg_first/last screwed up #2"); 1165 msqkptr->u.msg_first = 1166 NULL; 1167 msqkptr->u.msg_last = 1168 NULL; 1169 } else { 1170 if (prev == 1171 &msqkptr->u.msg_first) 1172 panic("msg_first/last screwed up #3"); 1173 msqkptr->u.msg_last = 1174 previous; 1175 } 1176 } 1177 break; 1178 } 1179 previous = msghdr; 1180 prev = &(msghdr->msg_next); 1181 } 1182 } 1183 1184 /* 1185 * We've either extracted the msghdr for the appropriate 1186 * message or there isn't one. 1187 * If there is one then bail out of this loop. 1188 */ 1189 1190 if (msghdr != NULL) 1191 break; 1192 1193 /* 1194 * Hmph! No message found. Does the user want to wait? 1195 */ 1196 1197 if ((msgflg & IPC_NOWAIT) != 0) { 1198 DPRINTF(("no appropriate message found (msgtyp=%ld)\n", 1199 msgtyp)); 1200 /* The SVID says to return ENOMSG. */ 1201 error = ENOMSG; 1202 goto done2; 1203 } 1204 1205 /* 1206 * Wait for something to happen 1207 */ 1208 1209 DPRINTF(("msgrcv: goodnight\n")); 1210 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH, 1211 "msgrcv", 0); 1212 DPRINTF(("msgrcv: good morning (error=%d)\n", error)); 1213 1214 if (error != 0) { 1215 DPRINTF(("msgrcv: interrupted system call\n")); 1216 error = EINTR; 1217 goto done2; 1218 } 1219 1220 /* 1221 * Make sure that the msq queue still exists 1222 */ 1223 1224 if (msqkptr->u.msg_qbytes == 0 || 1225 msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 1226 DPRINTF(("msqid deleted\n")); 1227 error = EIDRM; 1228 goto done2; 1229 } 1230 } 1231 1232 /* 1233 * Return the message to the user. 1234 * 1235 * First, do the bookkeeping (before we risk being interrupted). 1236 */ 1237 1238 msqkptr->u.msg_cbytes -= msghdr->msg_ts; 1239 msqkptr->u.msg_qnum--; 1240 msqkptr->u.msg_lrpid = td->td_proc->p_pid; 1241 msqkptr->u.msg_rtime = time_second; 1242 1243 racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, 1); 1244 racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msghdr->msg_ts); 1245 1246 /* 1247 * Make msgsz the actual amount that we'll be returning. 1248 * Note that this effectively truncates the message if it is too long 1249 * (since msgsz is never increased). 1250 */ 1251 1252 DPRINTF(("found a message, msgsz=%zu, msg_ts=%hu\n", msgsz, 1253 msghdr->msg_ts)); 1254 if (msgsz > msghdr->msg_ts) 1255 msgsz = msghdr->msg_ts; 1256 *mtype = msghdr->msg_type; 1257 1258 /* 1259 * Return the segments to the user 1260 */ 1261 1262 next = msghdr->msg_spot; 1263 for (len = 0; len < msgsz; len += msginfo.msgssz) { 1264 size_t tlen; 1265 1266 if (msgsz - len > msginfo.msgssz) 1267 tlen = msginfo.msgssz; 1268 else 1269 tlen = msgsz - len; 1270 if (next <= -1) 1271 panic("next too low #3"); 1272 if (next >= msginfo.msgseg) 1273 panic("next out of range #3"); 1274 mtx_unlock(&msq_mtx); 1275 error = copyout(&msgpool[next * msginfo.msgssz], msgp, tlen); 1276 mtx_lock(&msq_mtx); 1277 if (error != 0) { 1278 DPRINTF(("error (%d) copying out message segment\n", 1279 error)); 1280 msg_freehdr(msghdr); 1281 wakeup(msqkptr); 1282 goto done2; 1283 } 1284 msgp = (char *)msgp + tlen; 1285 next = msgmaps[next].next; 1286 } 1287 1288 /* 1289 * Done, return the actual number of bytes copied out. 1290 */ 1291 1292 msg_freehdr(msghdr); 1293 wakeup(msqkptr); 1294 td->td_retval[0] = msgsz; 1295 done2: 1296 mtx_unlock(&msq_mtx); 1297 return (error); 1298 } 1299 1300 int 1301 sys_msgrcv(td, uap) 1302 struct thread *td; 1303 register struct msgrcv_args *uap; 1304 { 1305 int error; 1306 long mtype; 1307 1308 DPRINTF(("call to msgrcv(%d, %p, %zu, %ld, %d)\n", uap->msqid, 1309 uap->msgp, uap->msgsz, uap->msgtyp, uap->msgflg)); 1310 1311 if ((error = kern_msgrcv(td, uap->msqid, 1312 (char *)uap->msgp + sizeof(mtype), uap->msgsz, 1313 uap->msgtyp, uap->msgflg, &mtype)) != 0) 1314 return (error); 1315 if ((error = copyout(&mtype, uap->msgp, sizeof(mtype))) != 0) 1316 DPRINTF(("error %d copying the message type\n", error)); 1317 return (error); 1318 } 1319 1320 static int 1321 sysctl_msqids(SYSCTL_HANDLER_ARGS) 1322 { 1323 1324 return (SYSCTL_OUT(req, msqids, 1325 sizeof(struct msqid_kernel) * msginfo.msgmni)); 1326 } 1327 1328 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmax, CTLFLAG_RD, &msginfo.msgmax, 0, 1329 "Maximum message size"); 1330 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmni, CTLFLAG_RDTUN, &msginfo.msgmni, 0, 1331 "Number of message queue identifiers"); 1332 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmnb, CTLFLAG_RDTUN, &msginfo.msgmnb, 0, 1333 "Maximum number of bytes in a queue"); 1334 SYSCTL_INT(_kern_ipc, OID_AUTO, msgtql, CTLFLAG_RDTUN, &msginfo.msgtql, 0, 1335 "Maximum number of messages in the system"); 1336 SYSCTL_INT(_kern_ipc, OID_AUTO, msgssz, CTLFLAG_RDTUN, &msginfo.msgssz, 0, 1337 "Size of a message segment"); 1338 SYSCTL_INT(_kern_ipc, OID_AUTO, msgseg, CTLFLAG_RDTUN, &msginfo.msgseg, 0, 1339 "Number of message segments"); 1340 SYSCTL_PROC(_kern_ipc, OID_AUTO, msqids, CTLTYPE_OPAQUE | CTLFLAG_RD, 1341 NULL, 0, sysctl_msqids, "", "Message queue IDs"); 1342 1343 #ifdef COMPAT_FREEBSD32 1344 int 1345 freebsd32_msgsys(struct thread *td, struct freebsd32_msgsys_args *uap) 1346 { 1347 1348 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1349 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1350 switch (uap->which) { 1351 case 0: 1352 return (freebsd7_freebsd32_msgctl(td, 1353 (struct freebsd7_freebsd32_msgctl_args *)&uap->a2)); 1354 case 2: 1355 return (freebsd32_msgsnd(td, 1356 (struct freebsd32_msgsnd_args *)&uap->a2)); 1357 case 3: 1358 return (freebsd32_msgrcv(td, 1359 (struct freebsd32_msgrcv_args *)&uap->a2)); 1360 default: 1361 return (sys_msgsys(td, (struct msgsys_args *)uap)); 1362 } 1363 #else 1364 return (nosys(td, NULL)); 1365 #endif 1366 } 1367 1368 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1369 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1370 int 1371 freebsd7_freebsd32_msgctl(struct thread *td, 1372 struct freebsd7_freebsd32_msgctl_args *uap) 1373 { 1374 struct msqid_ds msqbuf; 1375 struct msqid_ds32_old msqbuf32; 1376 int error; 1377 1378 if (uap->cmd == IPC_SET) { 1379 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32)); 1380 if (error) 1381 return (error); 1382 freebsd32_ipcperm_old_in(&msqbuf32.msg_perm, &msqbuf.msg_perm); 1383 PTRIN_CP(msqbuf32, msqbuf, msg_first); 1384 PTRIN_CP(msqbuf32, msqbuf, msg_last); 1385 CP(msqbuf32, msqbuf, msg_cbytes); 1386 CP(msqbuf32, msqbuf, msg_qnum); 1387 CP(msqbuf32, msqbuf, msg_qbytes); 1388 CP(msqbuf32, msqbuf, msg_lspid); 1389 CP(msqbuf32, msqbuf, msg_lrpid); 1390 CP(msqbuf32, msqbuf, msg_stime); 1391 CP(msqbuf32, msqbuf, msg_rtime); 1392 CP(msqbuf32, msqbuf, msg_ctime); 1393 } 1394 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1395 if (error) 1396 return (error); 1397 if (uap->cmd == IPC_STAT) { 1398 bzero(&msqbuf32, sizeof(msqbuf32)); 1399 freebsd32_ipcperm_old_out(&msqbuf.msg_perm, &msqbuf32.msg_perm); 1400 PTROUT_CP(msqbuf, msqbuf32, msg_first); 1401 PTROUT_CP(msqbuf, msqbuf32, msg_last); 1402 CP(msqbuf, msqbuf32, msg_cbytes); 1403 CP(msqbuf, msqbuf32, msg_qnum); 1404 CP(msqbuf, msqbuf32, msg_qbytes); 1405 CP(msqbuf, msqbuf32, msg_lspid); 1406 CP(msqbuf, msqbuf32, msg_lrpid); 1407 CP(msqbuf, msqbuf32, msg_stime); 1408 CP(msqbuf, msqbuf32, msg_rtime); 1409 CP(msqbuf, msqbuf32, msg_ctime); 1410 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32)); 1411 } 1412 return (error); 1413 } 1414 #endif 1415 1416 int 1417 freebsd32_msgctl(struct thread *td, struct freebsd32_msgctl_args *uap) 1418 { 1419 struct msqid_ds msqbuf; 1420 struct msqid_ds32 msqbuf32; 1421 int error; 1422 1423 if (uap->cmd == IPC_SET) { 1424 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32)); 1425 if (error) 1426 return (error); 1427 freebsd32_ipcperm_in(&msqbuf32.msg_perm, &msqbuf.msg_perm); 1428 PTRIN_CP(msqbuf32, msqbuf, msg_first); 1429 PTRIN_CP(msqbuf32, msqbuf, msg_last); 1430 CP(msqbuf32, msqbuf, msg_cbytes); 1431 CP(msqbuf32, msqbuf, msg_qnum); 1432 CP(msqbuf32, msqbuf, msg_qbytes); 1433 CP(msqbuf32, msqbuf, msg_lspid); 1434 CP(msqbuf32, msqbuf, msg_lrpid); 1435 CP(msqbuf32, msqbuf, msg_stime); 1436 CP(msqbuf32, msqbuf, msg_rtime); 1437 CP(msqbuf32, msqbuf, msg_ctime); 1438 } 1439 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1440 if (error) 1441 return (error); 1442 if (uap->cmd == IPC_STAT) { 1443 freebsd32_ipcperm_out(&msqbuf.msg_perm, &msqbuf32.msg_perm); 1444 PTROUT_CP(msqbuf, msqbuf32, msg_first); 1445 PTROUT_CP(msqbuf, msqbuf32, msg_last); 1446 CP(msqbuf, msqbuf32, msg_cbytes); 1447 CP(msqbuf, msqbuf32, msg_qnum); 1448 CP(msqbuf, msqbuf32, msg_qbytes); 1449 CP(msqbuf, msqbuf32, msg_lspid); 1450 CP(msqbuf, msqbuf32, msg_lrpid); 1451 CP(msqbuf, msqbuf32, msg_stime); 1452 CP(msqbuf, msqbuf32, msg_rtime); 1453 CP(msqbuf, msqbuf32, msg_ctime); 1454 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32)); 1455 } 1456 return (error); 1457 } 1458 1459 int 1460 freebsd32_msgsnd(struct thread *td, struct freebsd32_msgsnd_args *uap) 1461 { 1462 const void *msgp; 1463 long mtype; 1464 int32_t mtype32; 1465 int error; 1466 1467 msgp = PTRIN(uap->msgp); 1468 if ((error = copyin(msgp, &mtype32, sizeof(mtype32))) != 0) 1469 return (error); 1470 mtype = mtype32; 1471 return (kern_msgsnd(td, uap->msqid, 1472 (const char *)msgp + sizeof(mtype32), 1473 uap->msgsz, uap->msgflg, mtype)); 1474 } 1475 1476 int 1477 freebsd32_msgrcv(struct thread *td, struct freebsd32_msgrcv_args *uap) 1478 { 1479 void *msgp; 1480 long mtype; 1481 int32_t mtype32; 1482 int error; 1483 1484 msgp = PTRIN(uap->msgp); 1485 if ((error = kern_msgrcv(td, uap->msqid, 1486 (char *)msgp + sizeof(mtype32), uap->msgsz, 1487 uap->msgtyp, uap->msgflg, &mtype)) != 0) 1488 return (error); 1489 mtype32 = (int32_t)mtype; 1490 return (copyout(&mtype32, msgp, sizeof(mtype32))); 1491 } 1492 #endif 1493 1494 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1495 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1496 1497 /* XXX casting to (sy_call_t *) is bogus, as usual. */ 1498 static sy_call_t *msgcalls[] = { 1499 (sy_call_t *)freebsd7_msgctl, (sy_call_t *)sys_msgget, 1500 (sy_call_t *)sys_msgsnd, (sy_call_t *)sys_msgrcv 1501 }; 1502 1503 /* 1504 * Entry point for all MSG calls. 1505 */ 1506 int 1507 sys_msgsys(td, uap) 1508 struct thread *td; 1509 /* XXX actually varargs. */ 1510 struct msgsys_args /* { 1511 int which; 1512 int a2; 1513 int a3; 1514 int a4; 1515 int a5; 1516 int a6; 1517 } */ *uap; 1518 { 1519 int error; 1520 1521 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 1522 return (ENOSYS); 1523 if (uap->which < 0 || 1524 uap->which >= sizeof(msgcalls)/sizeof(msgcalls[0])) 1525 return (EINVAL); 1526 error = (*msgcalls[uap->which])(td, &uap->a2); 1527 return (error); 1528 } 1529 1530 #ifndef CP 1531 #define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0) 1532 #endif 1533 1534 #ifndef _SYS_SYSPROTO_H_ 1535 struct freebsd7_msgctl_args { 1536 int msqid; 1537 int cmd; 1538 struct msqid_ds_old *buf; 1539 }; 1540 #endif 1541 int 1542 freebsd7_msgctl(td, uap) 1543 struct thread *td; 1544 struct freebsd7_msgctl_args *uap; 1545 { 1546 struct msqid_ds_old msqold; 1547 struct msqid_ds msqbuf; 1548 int error; 1549 1550 DPRINTF(("call to freebsd7_msgctl(%d, %d, %p)\n", uap->msqid, uap->cmd, 1551 uap->buf)); 1552 if (uap->cmd == IPC_SET) { 1553 error = copyin(uap->buf, &msqold, sizeof(msqold)); 1554 if (error) 1555 return (error); 1556 ipcperm_old2new(&msqold.msg_perm, &msqbuf.msg_perm); 1557 CP(msqold, msqbuf, msg_first); 1558 CP(msqold, msqbuf, msg_last); 1559 CP(msqold, msqbuf, msg_cbytes); 1560 CP(msqold, msqbuf, msg_qnum); 1561 CP(msqold, msqbuf, msg_qbytes); 1562 CP(msqold, msqbuf, msg_lspid); 1563 CP(msqold, msqbuf, msg_lrpid); 1564 CP(msqold, msqbuf, msg_stime); 1565 CP(msqold, msqbuf, msg_rtime); 1566 CP(msqold, msqbuf, msg_ctime); 1567 } 1568 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1569 if (error) 1570 return (error); 1571 if (uap->cmd == IPC_STAT) { 1572 bzero(&msqold, sizeof(msqold)); 1573 ipcperm_new2old(&msqbuf.msg_perm, &msqold.msg_perm); 1574 CP(msqbuf, msqold, msg_first); 1575 CP(msqbuf, msqold, msg_last); 1576 CP(msqbuf, msqold, msg_cbytes); 1577 CP(msqbuf, msqold, msg_qnum); 1578 CP(msqbuf, msqold, msg_qbytes); 1579 CP(msqbuf, msqold, msg_lspid); 1580 CP(msqbuf, msqold, msg_lrpid); 1581 CP(msqbuf, msqold, msg_stime); 1582 CP(msqbuf, msqold, msg_rtime); 1583 CP(msqbuf, msqold, msg_ctime); 1584 error = copyout(&msqold, uap->buf, sizeof(struct msqid_ds_old)); 1585 } 1586 return (error); 1587 } 1588 1589 #undef CP 1590 1591 #endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 || 1592 COMPAT_FREEBSD7 */ 1593