Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/sysv_shm.c
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1 /* $NetBSD: sysv_shm.c,v 1.23 1994/07/04 23:25:12 glass Exp $ */ 2 /*- 3 * Copyright (c) 1994 Adam Glass and Charles Hannum. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Adam Glass and Charles 16 * Hannum. 17 * 4. The names of the authors may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 /*- 32 * Copyright (c) 2003-2005 McAfee, Inc. 33 * All rights reserved. 34 * 35 * This software was developed for the FreeBSD Project in part by McAfee 36 * Research, the Security Research Division of McAfee, Inc under DARPA/SPAWAR 37 * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS research 38 * program. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 */ 61 62 #include <sys/cdefs.h> 63 __FBSDID("$FreeBSD$"); 64 65 #include "opt_compat.h" 66 #include "opt_sysvipc.h" 67 68 #include <sys/param.h> 69 #include <sys/systm.h> 70 #include <sys/kernel.h> 71 #include <sys/limits.h> 72 #include <sys/lock.h> 73 #include <sys/sysctl.h> 74 #include <sys/shm.h> 75 #include <sys/proc.h> 76 #include <sys/malloc.h> 77 #include <sys/mman.h> 78 #include <sys/module.h> 79 #include <sys/mutex.h> 80 #include <sys/racct.h> 81 #include <sys/resourcevar.h> 82 #include <sys/stat.h> 83 #include <sys/syscall.h> 84 #include <sys/syscallsubr.h> 85 #include <sys/sysent.h> 86 #include <sys/sysproto.h> 87 #include <sys/jail.h> 88 89 #include <security/mac/mac_framework.h> 90 91 #include <vm/vm.h> 92 #include <vm/vm_param.h> 93 #include <vm/pmap.h> 94 #include <vm/vm_object.h> 95 #include <vm/vm_map.h> 96 #include <vm/vm_page.h> 97 #include <vm/vm_pager.h> 98 99 FEATURE(sysv_shm, "System V shared memory segments support"); 100 101 static MALLOC_DEFINE(M_SHM, "shm", "SVID compatible shared memory segments"); 102 103 static int shmget_allocate_segment(struct thread *td, 104 struct shmget_args *uap, int mode); 105 static int shmget_existing(struct thread *td, struct shmget_args *uap, 106 int mode, int segnum); 107 108 #define SHMSEG_FREE 0x0200 109 #define SHMSEG_REMOVED 0x0400 110 #define SHMSEG_ALLOCATED 0x0800 111 #define SHMSEG_WANTED 0x1000 112 113 static int shm_last_free, shm_nused, shmalloced; 114 vm_size_t shm_committed; 115 static struct shmid_kernel *shmsegs; 116 117 struct shmmap_state { 118 vm_offset_t va; 119 int shmid; 120 }; 121 122 static void shm_deallocate_segment(struct shmid_kernel *); 123 static int shm_find_segment_by_key(key_t); 124 static struct shmid_kernel *shm_find_segment_by_shmid(int); 125 static struct shmid_kernel *shm_find_segment_by_shmidx(int); 126 static int shm_delete_mapping(struct vmspace *vm, struct shmmap_state *); 127 static void shmrealloc(void); 128 static int shminit(void); 129 static int sysvshm_modload(struct module *, int, void *); 130 static int shmunload(void); 131 static void shmexit_myhook(struct vmspace *vm); 132 static void shmfork_myhook(struct proc *p1, struct proc *p2); 133 static int sysctl_shmsegs(SYSCTL_HANDLER_ARGS); 134 135 /* 136 * Tuneable values. 137 */ 138 #ifndef SHMMAXPGS 139 #define SHMMAXPGS 131072 /* Note: sysv shared memory is swap backed. */ 140 #endif 141 #ifndef SHMMAX 142 #define SHMMAX (SHMMAXPGS*PAGE_SIZE) 143 #endif 144 #ifndef SHMMIN 145 #define SHMMIN 1 146 #endif 147 #ifndef SHMMNI 148 #define SHMMNI 192 149 #endif 150 #ifndef SHMSEG 151 #define SHMSEG 128 152 #endif 153 #ifndef SHMALL 154 #define SHMALL (SHMMAXPGS) 155 #endif 156 157 struct shminfo shminfo = { 158 SHMMAX, 159 SHMMIN, 160 SHMMNI, 161 SHMSEG, 162 SHMALL 163 }; 164 165 static int shm_use_phys; 166 static int shm_allow_removed; 167 168 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmax, CTLFLAG_RW, &shminfo.shmmax, 0, 169 "Maximum shared memory segment size"); 170 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmin, CTLFLAG_RW, &shminfo.shmmin, 0, 171 "Minimum shared memory segment size"); 172 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmni, CTLFLAG_RDTUN, &shminfo.shmmni, 0, 173 "Number of shared memory identifiers"); 174 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmseg, CTLFLAG_RDTUN, &shminfo.shmseg, 0, 175 "Number of segments per process"); 176 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmall, CTLFLAG_RW, &shminfo.shmall, 0, 177 "Maximum number of pages available for shared memory"); 178 SYSCTL_INT(_kern_ipc, OID_AUTO, shm_use_phys, CTLFLAG_RW, 179 &shm_use_phys, 0, "Enable/Disable locking of shared memory pages in core"); 180 SYSCTL_INT(_kern_ipc, OID_AUTO, shm_allow_removed, CTLFLAG_RW, 181 &shm_allow_removed, 0, 182 "Enable/Disable attachment to attached segments marked for removal"); 183 SYSCTL_PROC(_kern_ipc, OID_AUTO, shmsegs, CTLTYPE_OPAQUE | CTLFLAG_RD, 184 NULL, 0, sysctl_shmsegs, "", 185 "Current number of shared memory segments allocated"); 186 187 static int 188 shm_find_segment_by_key(key) 189 key_t key; 190 { 191 int i; 192 193 for (i = 0; i < shmalloced; i++) 194 if ((shmsegs[i].u.shm_perm.mode & SHMSEG_ALLOCATED) && 195 shmsegs[i].u.shm_perm.key == key) 196 return (i); 197 return (-1); 198 } 199 200 static struct shmid_kernel * 201 shm_find_segment_by_shmid(int shmid) 202 { 203 int segnum; 204 struct shmid_kernel *shmseg; 205 206 segnum = IPCID_TO_IX(shmid); 207 if (segnum < 0 || segnum >= shmalloced) 208 return (NULL); 209 shmseg = &shmsegs[segnum]; 210 if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 || 211 (!shm_allow_removed && 212 (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) != 0) || 213 shmseg->u.shm_perm.seq != IPCID_TO_SEQ(shmid)) 214 return (NULL); 215 return (shmseg); 216 } 217 218 static struct shmid_kernel * 219 shm_find_segment_by_shmidx(int segnum) 220 { 221 struct shmid_kernel *shmseg; 222 223 if (segnum < 0 || segnum >= shmalloced) 224 return (NULL); 225 shmseg = &shmsegs[segnum]; 226 if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 || 227 (!shm_allow_removed && 228 (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) != 0)) 229 return (NULL); 230 return (shmseg); 231 } 232 233 static void 234 shm_deallocate_segment(shmseg) 235 struct shmid_kernel *shmseg; 236 { 237 vm_size_t size; 238 239 GIANT_REQUIRED; 240 241 vm_object_deallocate(shmseg->object); 242 shmseg->object = NULL; 243 size = round_page(shmseg->u.shm_segsz); 244 shm_committed -= btoc(size); 245 shm_nused--; 246 shmseg->u.shm_perm.mode = SHMSEG_FREE; 247 #ifdef MAC 248 mac_sysvshm_cleanup(shmseg); 249 #endif 250 racct_sub_cred(shmseg->cred, RACCT_NSHM, 1); 251 racct_sub_cred(shmseg->cred, RACCT_SHMSIZE, size); 252 crfree(shmseg->cred); 253 shmseg->cred = NULL; 254 } 255 256 static int 257 shm_delete_mapping(struct vmspace *vm, struct shmmap_state *shmmap_s) 258 { 259 struct shmid_kernel *shmseg; 260 int segnum, result; 261 vm_size_t size; 262 263 GIANT_REQUIRED; 264 265 segnum = IPCID_TO_IX(shmmap_s->shmid); 266 shmseg = &shmsegs[segnum]; 267 size = round_page(shmseg->u.shm_segsz); 268 result = vm_map_remove(&vm->vm_map, shmmap_s->va, shmmap_s->va + size); 269 if (result != KERN_SUCCESS) 270 return (EINVAL); 271 shmmap_s->shmid = -1; 272 shmseg->u.shm_dtime = time_second; 273 if ((--shmseg->u.shm_nattch <= 0) && 274 (shmseg->u.shm_perm.mode & SHMSEG_REMOVED)) { 275 shm_deallocate_segment(shmseg); 276 shm_last_free = segnum; 277 } 278 return (0); 279 } 280 281 #ifndef _SYS_SYSPROTO_H_ 282 struct shmdt_args { 283 const void *shmaddr; 284 }; 285 #endif 286 int 287 sys_shmdt(td, uap) 288 struct thread *td; 289 struct shmdt_args *uap; 290 { 291 struct proc *p = td->td_proc; 292 struct shmmap_state *shmmap_s; 293 #ifdef MAC 294 struct shmid_kernel *shmsegptr; 295 #endif 296 int i; 297 int error = 0; 298 299 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 300 return (ENOSYS); 301 mtx_lock(&Giant); 302 shmmap_s = p->p_vmspace->vm_shm; 303 if (shmmap_s == NULL) { 304 error = EINVAL; 305 goto done2; 306 } 307 for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) { 308 if (shmmap_s->shmid != -1 && 309 shmmap_s->va == (vm_offset_t)uap->shmaddr) { 310 break; 311 } 312 } 313 if (i == shminfo.shmseg) { 314 error = EINVAL; 315 goto done2; 316 } 317 #ifdef MAC 318 shmsegptr = &shmsegs[IPCID_TO_IX(shmmap_s->shmid)]; 319 error = mac_sysvshm_check_shmdt(td->td_ucred, shmsegptr); 320 if (error != 0) 321 goto done2; 322 #endif 323 error = shm_delete_mapping(p->p_vmspace, shmmap_s); 324 done2: 325 mtx_unlock(&Giant); 326 return (error); 327 } 328 329 #ifndef _SYS_SYSPROTO_H_ 330 struct shmat_args { 331 int shmid; 332 const void *shmaddr; 333 int shmflg; 334 }; 335 #endif 336 int 337 kern_shmat(td, shmid, shmaddr, shmflg) 338 struct thread *td; 339 int shmid; 340 const void *shmaddr; 341 int shmflg; 342 { 343 struct proc *p = td->td_proc; 344 int i, flags; 345 struct shmid_kernel *shmseg; 346 struct shmmap_state *shmmap_s = NULL; 347 vm_offset_t attach_va; 348 vm_prot_t prot; 349 vm_size_t size; 350 int rv; 351 int error = 0; 352 353 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 354 return (ENOSYS); 355 mtx_lock(&Giant); 356 shmmap_s = p->p_vmspace->vm_shm; 357 if (shmmap_s == NULL) { 358 shmmap_s = malloc(shminfo.shmseg * sizeof(struct shmmap_state), 359 M_SHM, M_WAITOK); 360 361 /* 362 * If malloc() above sleeps, the Giant lock is 363 * temporarily dropped, which allows another thread to 364 * allocate shmmap_state and set vm_shm. Recheck 365 * vm_shm and free the new shmmap_state if another one 366 * is already allocated. 367 */ 368 if (p->p_vmspace->vm_shm != NULL) { 369 free(shmmap_s, M_SHM); 370 shmmap_s = p->p_vmspace->vm_shm; 371 } else { 372 for (i = 0; i < shminfo.shmseg; i++) 373 shmmap_s[i].shmid = -1; 374 p->p_vmspace->vm_shm = shmmap_s; 375 } 376 } 377 shmseg = shm_find_segment_by_shmid(shmid); 378 if (shmseg == NULL) { 379 error = EINVAL; 380 goto done2; 381 } 382 error = ipcperm(td, &shmseg->u.shm_perm, 383 (shmflg & SHM_RDONLY) ? IPC_R : IPC_R|IPC_W); 384 if (error) 385 goto done2; 386 #ifdef MAC 387 error = mac_sysvshm_check_shmat(td->td_ucred, shmseg, shmflg); 388 if (error != 0) 389 goto done2; 390 #endif 391 for (i = 0; i < shminfo.shmseg; i++) { 392 if (shmmap_s->shmid == -1) 393 break; 394 shmmap_s++; 395 } 396 if (i >= shminfo.shmseg) { 397 error = EMFILE; 398 goto done2; 399 } 400 size = round_page(shmseg->u.shm_segsz); 401 prot = VM_PROT_READ; 402 if ((shmflg & SHM_RDONLY) == 0) 403 prot |= VM_PROT_WRITE; 404 flags = MAP_ANON | MAP_SHARED; 405 if (shmaddr) { 406 flags |= MAP_FIXED; 407 if (shmflg & SHM_RND) { 408 attach_va = (vm_offset_t)shmaddr & ~(SHMLBA-1); 409 } else if (((vm_offset_t)shmaddr & (SHMLBA-1)) == 0) { 410 attach_va = (vm_offset_t)shmaddr; 411 } else { 412 error = EINVAL; 413 goto done2; 414 } 415 } else { 416 /* 417 * This is just a hint to vm_map_find() about where to 418 * put it. 419 */ 420 PROC_LOCK(p); 421 attach_va = round_page((vm_offset_t)p->p_vmspace->vm_daddr + 422 lim_max(p, RLIMIT_DATA)); 423 PROC_UNLOCK(p); 424 } 425 426 vm_object_reference(shmseg->object); 427 rv = vm_map_find(&p->p_vmspace->vm_map, shmseg->object, 428 0, &attach_va, size, (flags & MAP_FIXED) ? VMFS_NO_SPACE : 429 VMFS_OPTIMAL_SPACE, prot, prot, MAP_INHERIT_SHARE); 430 if (rv != KERN_SUCCESS) { 431 vm_object_deallocate(shmseg->object); 432 error = ENOMEM; 433 goto done2; 434 } 435 436 shmmap_s->va = attach_va; 437 shmmap_s->shmid = shmid; 438 shmseg->u.shm_lpid = p->p_pid; 439 shmseg->u.shm_atime = time_second; 440 shmseg->u.shm_nattch++; 441 td->td_retval[0] = attach_va; 442 done2: 443 mtx_unlock(&Giant); 444 return (error); 445 } 446 447 int 448 sys_shmat(td, uap) 449 struct thread *td; 450 struct shmat_args *uap; 451 { 452 return kern_shmat(td, uap->shmid, uap->shmaddr, uap->shmflg); 453 } 454 455 int 456 kern_shmctl(td, shmid, cmd, buf, bufsz) 457 struct thread *td; 458 int shmid; 459 int cmd; 460 void *buf; 461 size_t *bufsz; 462 { 463 int error = 0; 464 struct shmid_kernel *shmseg; 465 466 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 467 return (ENOSYS); 468 469 mtx_lock(&Giant); 470 switch (cmd) { 471 /* 472 * It is possible that kern_shmctl is being called from the Linux ABI 473 * layer, in which case, we will need to implement IPC_INFO. It should 474 * be noted that other shmctl calls will be funneled through here for 475 * Linix binaries as well. 476 * 477 * NB: The Linux ABI layer will convert this data to structure(s) more 478 * consistent with the Linux ABI. 479 */ 480 case IPC_INFO: 481 memcpy(buf, &shminfo, sizeof(shminfo)); 482 if (bufsz) 483 *bufsz = sizeof(shminfo); 484 td->td_retval[0] = shmalloced; 485 goto done2; 486 case SHM_INFO: { 487 struct shm_info shm_info; 488 shm_info.used_ids = shm_nused; 489 shm_info.shm_rss = 0; /*XXX where to get from ? */ 490 shm_info.shm_tot = 0; /*XXX where to get from ? */ 491 shm_info.shm_swp = 0; /*XXX where to get from ? */ 492 shm_info.swap_attempts = 0; /*XXX where to get from ? */ 493 shm_info.swap_successes = 0; /*XXX where to get from ? */ 494 memcpy(buf, &shm_info, sizeof(shm_info)); 495 if (bufsz) 496 *bufsz = sizeof(shm_info); 497 td->td_retval[0] = shmalloced; 498 goto done2; 499 } 500 } 501 if (cmd == SHM_STAT) 502 shmseg = shm_find_segment_by_shmidx(shmid); 503 else 504 shmseg = shm_find_segment_by_shmid(shmid); 505 if (shmseg == NULL) { 506 error = EINVAL; 507 goto done2; 508 } 509 #ifdef MAC 510 error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, cmd); 511 if (error != 0) 512 goto done2; 513 #endif 514 switch (cmd) { 515 case SHM_STAT: 516 case IPC_STAT: 517 error = ipcperm(td, &shmseg->u.shm_perm, IPC_R); 518 if (error) 519 goto done2; 520 memcpy(buf, &shmseg->u, sizeof(struct shmid_ds)); 521 if (bufsz) 522 *bufsz = sizeof(struct shmid_ds); 523 if (cmd == SHM_STAT) 524 td->td_retval[0] = IXSEQ_TO_IPCID(shmid, shmseg->u.shm_perm); 525 break; 526 case IPC_SET: { 527 struct shmid_ds *shmid; 528 529 shmid = (struct shmid_ds *)buf; 530 error = ipcperm(td, &shmseg->u.shm_perm, IPC_M); 531 if (error) 532 goto done2; 533 shmseg->u.shm_perm.uid = shmid->shm_perm.uid; 534 shmseg->u.shm_perm.gid = shmid->shm_perm.gid; 535 shmseg->u.shm_perm.mode = 536 (shmseg->u.shm_perm.mode & ~ACCESSPERMS) | 537 (shmid->shm_perm.mode & ACCESSPERMS); 538 shmseg->u.shm_ctime = time_second; 539 break; 540 } 541 case IPC_RMID: 542 error = ipcperm(td, &shmseg->u.shm_perm, IPC_M); 543 if (error) 544 goto done2; 545 shmseg->u.shm_perm.key = IPC_PRIVATE; 546 shmseg->u.shm_perm.mode |= SHMSEG_REMOVED; 547 if (shmseg->u.shm_nattch <= 0) { 548 shm_deallocate_segment(shmseg); 549 shm_last_free = IPCID_TO_IX(shmid); 550 } 551 break; 552 #if 0 553 case SHM_LOCK: 554 case SHM_UNLOCK: 555 #endif 556 default: 557 error = EINVAL; 558 break; 559 } 560 done2: 561 mtx_unlock(&Giant); 562 return (error); 563 } 564 565 #ifndef _SYS_SYSPROTO_H_ 566 struct shmctl_args { 567 int shmid; 568 int cmd; 569 struct shmid_ds *buf; 570 }; 571 #endif 572 int 573 sys_shmctl(td, uap) 574 struct thread *td; 575 struct shmctl_args *uap; 576 { 577 int error = 0; 578 struct shmid_ds buf; 579 size_t bufsz; 580 581 /* 582 * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support 583 * Linux binaries. If we see the call come through the FreeBSD ABI, 584 * return an error back to the user since we do not to support this. 585 */ 586 if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO || 587 uap->cmd == SHM_STAT) 588 return (EINVAL); 589 590 /* IPC_SET needs to copyin the buffer before calling kern_shmctl */ 591 if (uap->cmd == IPC_SET) { 592 if ((error = copyin(uap->buf, &buf, sizeof(struct shmid_ds)))) 593 goto done; 594 } 595 596 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz); 597 if (error) 598 goto done; 599 600 /* Cases in which we need to copyout */ 601 switch (uap->cmd) { 602 case IPC_STAT: 603 error = copyout(&buf, uap->buf, bufsz); 604 break; 605 } 606 607 done: 608 if (error) { 609 /* Invalidate the return value */ 610 td->td_retval[0] = -1; 611 } 612 return (error); 613 } 614 615 616 static int 617 shmget_existing(td, uap, mode, segnum) 618 struct thread *td; 619 struct shmget_args *uap; 620 int mode; 621 int segnum; 622 { 623 struct shmid_kernel *shmseg; 624 int error; 625 626 shmseg = &shmsegs[segnum]; 627 if (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) { 628 /* 629 * This segment is in the process of being allocated. Wait 630 * until it's done, and look the key up again (in case the 631 * allocation failed or it was freed). 632 */ 633 shmseg->u.shm_perm.mode |= SHMSEG_WANTED; 634 error = tsleep(shmseg, PLOCK | PCATCH, "shmget", 0); 635 if (error) 636 return (error); 637 return (EAGAIN); 638 } 639 if ((uap->shmflg & (IPC_CREAT | IPC_EXCL)) == (IPC_CREAT | IPC_EXCL)) 640 return (EEXIST); 641 #ifdef MAC 642 error = mac_sysvshm_check_shmget(td->td_ucred, shmseg, uap->shmflg); 643 if (error != 0) 644 return (error); 645 #endif 646 if (uap->size != 0 && uap->size > shmseg->u.shm_segsz) 647 return (EINVAL); 648 td->td_retval[0] = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm); 649 return (0); 650 } 651 652 static int 653 shmget_allocate_segment(td, uap, mode) 654 struct thread *td; 655 struct shmget_args *uap; 656 int mode; 657 { 658 int i, segnum, shmid; 659 size_t size; 660 struct ucred *cred = td->td_ucred; 661 struct shmid_kernel *shmseg; 662 vm_object_t shm_object; 663 664 GIANT_REQUIRED; 665 666 if (uap->size < shminfo.shmmin || uap->size > shminfo.shmmax) 667 return (EINVAL); 668 if (shm_nused >= shminfo.shmmni) /* Any shmids left? */ 669 return (ENOSPC); 670 size = round_page(uap->size); 671 if (shm_committed + btoc(size) > shminfo.shmall) 672 return (ENOMEM); 673 if (shm_last_free < 0) { 674 shmrealloc(); /* Maybe expand the shmsegs[] array. */ 675 for (i = 0; i < shmalloced; i++) 676 if (shmsegs[i].u.shm_perm.mode & SHMSEG_FREE) 677 break; 678 if (i == shmalloced) 679 return (ENOSPC); 680 segnum = i; 681 } else { 682 segnum = shm_last_free; 683 shm_last_free = -1; 684 } 685 shmseg = &shmsegs[segnum]; 686 #ifdef RACCT 687 PROC_LOCK(td->td_proc); 688 if (racct_add(td->td_proc, RACCT_NSHM, 1)) { 689 PROC_UNLOCK(td->td_proc); 690 return (ENOSPC); 691 } 692 if (racct_add(td->td_proc, RACCT_SHMSIZE, size)) { 693 racct_sub(td->td_proc, RACCT_NSHM, 1); 694 PROC_UNLOCK(td->td_proc); 695 return (ENOMEM); 696 } 697 PROC_UNLOCK(td->td_proc); 698 #endif 699 /* 700 * In case we sleep in malloc(), mark the segment present but deleted 701 * so that noone else tries to create the same key. 702 */ 703 shmseg->u.shm_perm.mode = SHMSEG_ALLOCATED | SHMSEG_REMOVED; 704 shmseg->u.shm_perm.key = uap->key; 705 shmseg->u.shm_perm.seq = (shmseg->u.shm_perm.seq + 1) & 0x7fff; 706 shmid = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm); 707 708 /* 709 * We make sure that we have allocated a pager before we need 710 * to. 711 */ 712 shm_object = vm_pager_allocate(shm_use_phys ? OBJT_PHYS : OBJT_SWAP, 713 0, size, VM_PROT_DEFAULT, 0, cred); 714 if (shm_object == NULL) { 715 #ifdef RACCT 716 PROC_LOCK(td->td_proc); 717 racct_sub(td->td_proc, RACCT_NSHM, 1); 718 racct_sub(td->td_proc, RACCT_SHMSIZE, size); 719 PROC_UNLOCK(td->td_proc); 720 #endif 721 return (ENOMEM); 722 } 723 VM_OBJECT_LOCK(shm_object); 724 vm_object_clear_flag(shm_object, OBJ_ONEMAPPING); 725 vm_object_set_flag(shm_object, OBJ_NOSPLIT); 726 VM_OBJECT_UNLOCK(shm_object); 727 728 shmseg->object = shm_object; 729 shmseg->u.shm_perm.cuid = shmseg->u.shm_perm.uid = cred->cr_uid; 730 shmseg->u.shm_perm.cgid = shmseg->u.shm_perm.gid = cred->cr_gid; 731 shmseg->u.shm_perm.mode = (shmseg->u.shm_perm.mode & SHMSEG_WANTED) | 732 (mode & ACCESSPERMS) | SHMSEG_ALLOCATED; 733 shmseg->cred = crhold(cred); 734 shmseg->u.shm_segsz = uap->size; 735 shmseg->u.shm_cpid = td->td_proc->p_pid; 736 shmseg->u.shm_lpid = shmseg->u.shm_nattch = 0; 737 shmseg->u.shm_atime = shmseg->u.shm_dtime = 0; 738 #ifdef MAC 739 mac_sysvshm_create(cred, shmseg); 740 #endif 741 shmseg->u.shm_ctime = time_second; 742 shm_committed += btoc(size); 743 shm_nused++; 744 if (shmseg->u.shm_perm.mode & SHMSEG_WANTED) { 745 /* 746 * Somebody else wanted this key while we were asleep. Wake 747 * them up now. 748 */ 749 shmseg->u.shm_perm.mode &= ~SHMSEG_WANTED; 750 wakeup(shmseg); 751 } 752 td->td_retval[0] = shmid; 753 return (0); 754 } 755 756 #ifndef _SYS_SYSPROTO_H_ 757 struct shmget_args { 758 key_t key; 759 size_t size; 760 int shmflg; 761 }; 762 #endif 763 int 764 sys_shmget(td, uap) 765 struct thread *td; 766 struct shmget_args *uap; 767 { 768 int segnum, mode; 769 int error; 770 771 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 772 return (ENOSYS); 773 mtx_lock(&Giant); 774 mode = uap->shmflg & ACCESSPERMS; 775 if (uap->key != IPC_PRIVATE) { 776 again: 777 segnum = shm_find_segment_by_key(uap->key); 778 if (segnum >= 0) { 779 error = shmget_existing(td, uap, mode, segnum); 780 if (error == EAGAIN) 781 goto again; 782 goto done2; 783 } 784 if ((uap->shmflg & IPC_CREAT) == 0) { 785 error = ENOENT; 786 goto done2; 787 } 788 } 789 error = shmget_allocate_segment(td, uap, mode); 790 done2: 791 mtx_unlock(&Giant); 792 return (error); 793 } 794 795 static void 796 shmfork_myhook(p1, p2) 797 struct proc *p1, *p2; 798 { 799 struct shmmap_state *shmmap_s; 800 size_t size; 801 int i; 802 803 mtx_lock(&Giant); 804 size = shminfo.shmseg * sizeof(struct shmmap_state); 805 shmmap_s = malloc(size, M_SHM, M_WAITOK); 806 bcopy(p1->p_vmspace->vm_shm, shmmap_s, size); 807 p2->p_vmspace->vm_shm = shmmap_s; 808 for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) 809 if (shmmap_s->shmid != -1) 810 shmsegs[IPCID_TO_IX(shmmap_s->shmid)].u.shm_nattch++; 811 mtx_unlock(&Giant); 812 } 813 814 static void 815 shmexit_myhook(struct vmspace *vm) 816 { 817 struct shmmap_state *base, *shm; 818 int i; 819 820 if ((base = vm->vm_shm) != NULL) { 821 vm->vm_shm = NULL; 822 mtx_lock(&Giant); 823 for (i = 0, shm = base; i < shminfo.shmseg; i++, shm++) { 824 if (shm->shmid != -1) 825 shm_delete_mapping(vm, shm); 826 } 827 mtx_unlock(&Giant); 828 free(base, M_SHM); 829 } 830 } 831 832 static void 833 shmrealloc(void) 834 { 835 int i; 836 struct shmid_kernel *newsegs; 837 838 if (shmalloced >= shminfo.shmmni) 839 return; 840 841 newsegs = malloc(shminfo.shmmni * sizeof(*newsegs), M_SHM, M_WAITOK); 842 for (i = 0; i < shmalloced; i++) 843 bcopy(&shmsegs[i], &newsegs[i], sizeof(newsegs[0])); 844 for (; i < shminfo.shmmni; i++) { 845 shmsegs[i].u.shm_perm.mode = SHMSEG_FREE; 846 shmsegs[i].u.shm_perm.seq = 0; 847 #ifdef MAC 848 mac_sysvshm_init(&shmsegs[i]); 849 #endif 850 } 851 free(shmsegs, M_SHM); 852 shmsegs = newsegs; 853 shmalloced = shminfo.shmmni; 854 } 855 856 static struct syscall_helper_data shm_syscalls[] = { 857 SYSCALL_INIT_HELPER(shmat), 858 SYSCALL_INIT_HELPER(shmctl), 859 SYSCALL_INIT_HELPER(shmdt), 860 SYSCALL_INIT_HELPER(shmget), 861 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 862 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 863 SYSCALL_INIT_HELPER_COMPAT(freebsd7_shmctl), 864 #endif 865 #if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43)) 866 SYSCALL_INIT_HELPER(shmsys), 867 #endif 868 SYSCALL_INIT_LAST 869 }; 870 871 #ifdef COMPAT_FREEBSD32 872 #include <compat/freebsd32/freebsd32.h> 873 #include <compat/freebsd32/freebsd32_ipc.h> 874 #include <compat/freebsd32/freebsd32_proto.h> 875 #include <compat/freebsd32/freebsd32_signal.h> 876 #include <compat/freebsd32/freebsd32_syscall.h> 877 #include <compat/freebsd32/freebsd32_util.h> 878 879 static struct syscall_helper_data shm32_syscalls[] = { 880 SYSCALL32_INIT_HELPER_COMPAT(shmat), 881 SYSCALL32_INIT_HELPER_COMPAT(shmdt), 882 SYSCALL32_INIT_HELPER_COMPAT(shmget), 883 SYSCALL32_INIT_HELPER(freebsd32_shmsys), 884 SYSCALL32_INIT_HELPER(freebsd32_shmctl), 885 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 886 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 887 SYSCALL32_INIT_HELPER(freebsd7_freebsd32_shmctl), 888 #endif 889 SYSCALL_INIT_LAST 890 }; 891 #endif 892 893 static int 894 shminit() 895 { 896 int i, error; 897 898 #ifndef BURN_BRIDGES 899 if (TUNABLE_ULONG_FETCH("kern.ipc.shmmaxpgs", &shminfo.shmall) != 0) 900 printf("kern.ipc.shmmaxpgs is now called kern.ipc.shmall!\n"); 901 #endif 902 TUNABLE_ULONG_FETCH("kern.ipc.shmall", &shminfo.shmall); 903 904 /* Initialize shmmax dealing with possible overflow. */ 905 for (i = PAGE_SIZE; i > 0; i--) { 906 shminfo.shmmax = shminfo.shmall * i; 907 if (shminfo.shmmax >= shminfo.shmall) 908 break; 909 } 910 911 TUNABLE_ULONG_FETCH("kern.ipc.shmmin", &shminfo.shmmin); 912 TUNABLE_ULONG_FETCH("kern.ipc.shmmni", &shminfo.shmmni); 913 TUNABLE_ULONG_FETCH("kern.ipc.shmseg", &shminfo.shmseg); 914 TUNABLE_INT_FETCH("kern.ipc.shm_use_phys", &shm_use_phys); 915 916 shmalloced = shminfo.shmmni; 917 shmsegs = malloc(shmalloced * sizeof(shmsegs[0]), M_SHM, M_WAITOK); 918 for (i = 0; i < shmalloced; i++) { 919 shmsegs[i].u.shm_perm.mode = SHMSEG_FREE; 920 shmsegs[i].u.shm_perm.seq = 0; 921 #ifdef MAC 922 mac_sysvshm_init(&shmsegs[i]); 923 #endif 924 } 925 shm_last_free = 0; 926 shm_nused = 0; 927 shm_committed = 0; 928 shmexit_hook = &shmexit_myhook; 929 shmfork_hook = &shmfork_myhook; 930 931 error = syscall_helper_register(shm_syscalls); 932 if (error != 0) 933 return (error); 934 #ifdef COMPAT_FREEBSD32 935 error = syscall32_helper_register(shm32_syscalls); 936 if (error != 0) 937 return (error); 938 #endif 939 return (0); 940 } 941 942 static int 943 shmunload() 944 { 945 int i; 946 947 if (shm_nused > 0) 948 return (EBUSY); 949 950 #ifdef COMPAT_FREEBSD32 951 syscall32_helper_unregister(shm32_syscalls); 952 #endif 953 syscall_helper_unregister(shm_syscalls); 954 955 for (i = 0; i < shmalloced; i++) { 956 #ifdef MAC 957 mac_sysvshm_destroy(&shmsegs[i]); 958 #endif 959 /* 960 * Objects might be still mapped into the processes 961 * address spaces. Actual free would happen on the 962 * last mapping destruction. 963 */ 964 if (shmsegs[i].u.shm_perm.mode != SHMSEG_FREE) 965 vm_object_deallocate(shmsegs[i].object); 966 } 967 free(shmsegs, M_SHM); 968 shmexit_hook = NULL; 969 shmfork_hook = NULL; 970 return (0); 971 } 972 973 static int 974 sysctl_shmsegs(SYSCTL_HANDLER_ARGS) 975 { 976 977 return (SYSCTL_OUT(req, shmsegs, shmalloced * sizeof(shmsegs[0]))); 978 } 979 980 #if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43)) 981 struct oshmid_ds { 982 struct ipc_perm_old shm_perm; /* operation perms */ 983 int shm_segsz; /* size of segment (bytes) */ 984 u_short shm_cpid; /* pid, creator */ 985 u_short shm_lpid; /* pid, last operation */ 986 short shm_nattch; /* no. of current attaches */ 987 time_t shm_atime; /* last attach time */ 988 time_t shm_dtime; /* last detach time */ 989 time_t shm_ctime; /* last change time */ 990 void *shm_handle; /* internal handle for shm segment */ 991 }; 992 993 struct oshmctl_args { 994 int shmid; 995 int cmd; 996 struct oshmid_ds *ubuf; 997 }; 998 999 static int 1000 oshmctl(struct thread *td, struct oshmctl_args *uap) 1001 { 1002 #ifdef COMPAT_43 1003 int error = 0; 1004 struct shmid_kernel *shmseg; 1005 struct oshmid_ds outbuf; 1006 1007 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 1008 return (ENOSYS); 1009 mtx_lock(&Giant); 1010 shmseg = shm_find_segment_by_shmid(uap->shmid); 1011 if (shmseg == NULL) { 1012 error = EINVAL; 1013 goto done2; 1014 } 1015 switch (uap->cmd) { 1016 case IPC_STAT: 1017 error = ipcperm(td, &shmseg->u.shm_perm, IPC_R); 1018 if (error) 1019 goto done2; 1020 #ifdef MAC 1021 error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, uap->cmd); 1022 if (error != 0) 1023 goto done2; 1024 #endif 1025 ipcperm_new2old(&shmseg->u.shm_perm, &outbuf.shm_perm); 1026 outbuf.shm_segsz = shmseg->u.shm_segsz; 1027 outbuf.shm_cpid = shmseg->u.shm_cpid; 1028 outbuf.shm_lpid = shmseg->u.shm_lpid; 1029 outbuf.shm_nattch = shmseg->u.shm_nattch; 1030 outbuf.shm_atime = shmseg->u.shm_atime; 1031 outbuf.shm_dtime = shmseg->u.shm_dtime; 1032 outbuf.shm_ctime = shmseg->u.shm_ctime; 1033 outbuf.shm_handle = shmseg->object; 1034 error = copyout(&outbuf, uap->ubuf, sizeof(outbuf)); 1035 if (error) 1036 goto done2; 1037 break; 1038 default: 1039 error = freebsd7_shmctl(td, (struct freebsd7_shmctl_args *)uap); 1040 break; 1041 } 1042 done2: 1043 mtx_unlock(&Giant); 1044 return (error); 1045 #else 1046 return (EINVAL); 1047 #endif 1048 } 1049 1050 /* XXX casting to (sy_call_t *) is bogus, as usual. */ 1051 static sy_call_t *shmcalls[] = { 1052 (sy_call_t *)sys_shmat, (sy_call_t *)oshmctl, 1053 (sy_call_t *)sys_shmdt, (sy_call_t *)sys_shmget, 1054 (sy_call_t *)freebsd7_shmctl 1055 }; 1056 1057 int 1058 sys_shmsys(td, uap) 1059 struct thread *td; 1060 /* XXX actually varargs. */ 1061 struct shmsys_args /* { 1062 int which; 1063 int a2; 1064 int a3; 1065 int a4; 1066 } */ *uap; 1067 { 1068 int error; 1069 1070 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 1071 return (ENOSYS); 1072 if (uap->which < 0 || 1073 uap->which >= sizeof(shmcalls)/sizeof(shmcalls[0])) 1074 return (EINVAL); 1075 mtx_lock(&Giant); 1076 error = (*shmcalls[uap->which])(td, &uap->a2); 1077 mtx_unlock(&Giant); 1078 return (error); 1079 } 1080 1081 #endif /* i386 && (COMPAT_FREEBSD4 || COMPAT_43) */ 1082 1083 #ifdef COMPAT_FREEBSD32 1084 1085 int 1086 freebsd32_shmsys(struct thread *td, struct freebsd32_shmsys_args *uap) 1087 { 1088 1089 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1090 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1091 switch (uap->which) { 1092 case 0: { /* shmat */ 1093 struct shmat_args ap; 1094 1095 ap.shmid = uap->a2; 1096 ap.shmaddr = PTRIN(uap->a3); 1097 ap.shmflg = uap->a4; 1098 return (sysent[SYS_shmat].sy_call(td, &ap)); 1099 } 1100 case 2: { /* shmdt */ 1101 struct shmdt_args ap; 1102 1103 ap.shmaddr = PTRIN(uap->a2); 1104 return (sysent[SYS_shmdt].sy_call(td, &ap)); 1105 } 1106 case 3: { /* shmget */ 1107 struct shmget_args ap; 1108 1109 ap.key = uap->a2; 1110 ap.size = uap->a3; 1111 ap.shmflg = uap->a4; 1112 return (sysent[SYS_shmget].sy_call(td, &ap)); 1113 } 1114 case 4: { /* shmctl */ 1115 struct freebsd7_freebsd32_shmctl_args ap; 1116 1117 ap.shmid = uap->a2; 1118 ap.cmd = uap->a3; 1119 ap.buf = PTRIN(uap->a4); 1120 return (freebsd7_freebsd32_shmctl(td, &ap)); 1121 } 1122 case 1: /* oshmctl */ 1123 default: 1124 return (EINVAL); 1125 } 1126 #else 1127 return (nosys(td, NULL)); 1128 #endif 1129 } 1130 1131 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1132 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1133 int 1134 freebsd7_freebsd32_shmctl(struct thread *td, 1135 struct freebsd7_freebsd32_shmctl_args *uap) 1136 { 1137 int error = 0; 1138 union { 1139 struct shmid_ds shmid_ds; 1140 struct shm_info shm_info; 1141 struct shminfo shminfo; 1142 } u; 1143 union { 1144 struct shmid_ds32_old shmid_ds32; 1145 struct shm_info32 shm_info32; 1146 struct shminfo32 shminfo32; 1147 } u32; 1148 size_t sz; 1149 1150 if (uap->cmd == IPC_SET) { 1151 if ((error = copyin(uap->buf, &u32.shmid_ds32, 1152 sizeof(u32.shmid_ds32)))) 1153 goto done; 1154 freebsd32_ipcperm_old_in(&u32.shmid_ds32.shm_perm, 1155 &u.shmid_ds.shm_perm); 1156 CP(u32.shmid_ds32, u.shmid_ds, shm_segsz); 1157 CP(u32.shmid_ds32, u.shmid_ds, shm_lpid); 1158 CP(u32.shmid_ds32, u.shmid_ds, shm_cpid); 1159 CP(u32.shmid_ds32, u.shmid_ds, shm_nattch); 1160 CP(u32.shmid_ds32, u.shmid_ds, shm_atime); 1161 CP(u32.shmid_ds32, u.shmid_ds, shm_dtime); 1162 CP(u32.shmid_ds32, u.shmid_ds, shm_ctime); 1163 } 1164 1165 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz); 1166 if (error) 1167 goto done; 1168 1169 /* Cases in which we need to copyout */ 1170 switch (uap->cmd) { 1171 case IPC_INFO: 1172 CP(u.shminfo, u32.shminfo32, shmmax); 1173 CP(u.shminfo, u32.shminfo32, shmmin); 1174 CP(u.shminfo, u32.shminfo32, shmmni); 1175 CP(u.shminfo, u32.shminfo32, shmseg); 1176 CP(u.shminfo, u32.shminfo32, shmall); 1177 error = copyout(&u32.shminfo32, uap->buf, 1178 sizeof(u32.shminfo32)); 1179 break; 1180 case SHM_INFO: 1181 CP(u.shm_info, u32.shm_info32, used_ids); 1182 CP(u.shm_info, u32.shm_info32, shm_rss); 1183 CP(u.shm_info, u32.shm_info32, shm_tot); 1184 CP(u.shm_info, u32.shm_info32, shm_swp); 1185 CP(u.shm_info, u32.shm_info32, swap_attempts); 1186 CP(u.shm_info, u32.shm_info32, swap_successes); 1187 error = copyout(&u32.shm_info32, uap->buf, 1188 sizeof(u32.shm_info32)); 1189 break; 1190 case SHM_STAT: 1191 case IPC_STAT: 1192 freebsd32_ipcperm_old_out(&u.shmid_ds.shm_perm, 1193 &u32.shmid_ds32.shm_perm); 1194 if (u.shmid_ds.shm_segsz > INT32_MAX) 1195 u32.shmid_ds32.shm_segsz = INT32_MAX; 1196 else 1197 CP(u.shmid_ds, u32.shmid_ds32, shm_segsz); 1198 CP(u.shmid_ds, u32.shmid_ds32, shm_lpid); 1199 CP(u.shmid_ds, u32.shmid_ds32, shm_cpid); 1200 CP(u.shmid_ds, u32.shmid_ds32, shm_nattch); 1201 CP(u.shmid_ds, u32.shmid_ds32, shm_atime); 1202 CP(u.shmid_ds, u32.shmid_ds32, shm_dtime); 1203 CP(u.shmid_ds, u32.shmid_ds32, shm_ctime); 1204 u32.shmid_ds32.shm_internal = 0; 1205 error = copyout(&u32.shmid_ds32, uap->buf, 1206 sizeof(u32.shmid_ds32)); 1207 break; 1208 } 1209 1210 done: 1211 if (error) { 1212 /* Invalidate the return value */ 1213 td->td_retval[0] = -1; 1214 } 1215 return (error); 1216 } 1217 #endif 1218 1219 int 1220 freebsd32_shmctl(struct thread *td, struct freebsd32_shmctl_args *uap) 1221 { 1222 int error = 0; 1223 union { 1224 struct shmid_ds shmid_ds; 1225 struct shm_info shm_info; 1226 struct shminfo shminfo; 1227 } u; 1228 union { 1229 struct shmid_ds32 shmid_ds32; 1230 struct shm_info32 shm_info32; 1231 struct shminfo32 shminfo32; 1232 } u32; 1233 size_t sz; 1234 1235 if (uap->cmd == IPC_SET) { 1236 if ((error = copyin(uap->buf, &u32.shmid_ds32, 1237 sizeof(u32.shmid_ds32)))) 1238 goto done; 1239 freebsd32_ipcperm_in(&u32.shmid_ds32.shm_perm, 1240 &u.shmid_ds.shm_perm); 1241 CP(u32.shmid_ds32, u.shmid_ds, shm_segsz); 1242 CP(u32.shmid_ds32, u.shmid_ds, shm_lpid); 1243 CP(u32.shmid_ds32, u.shmid_ds, shm_cpid); 1244 CP(u32.shmid_ds32, u.shmid_ds, shm_nattch); 1245 CP(u32.shmid_ds32, u.shmid_ds, shm_atime); 1246 CP(u32.shmid_ds32, u.shmid_ds, shm_dtime); 1247 CP(u32.shmid_ds32, u.shmid_ds, shm_ctime); 1248 } 1249 1250 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz); 1251 if (error) 1252 goto done; 1253 1254 /* Cases in which we need to copyout */ 1255 switch (uap->cmd) { 1256 case IPC_INFO: 1257 CP(u.shminfo, u32.shminfo32, shmmax); 1258 CP(u.shminfo, u32.shminfo32, shmmin); 1259 CP(u.shminfo, u32.shminfo32, shmmni); 1260 CP(u.shminfo, u32.shminfo32, shmseg); 1261 CP(u.shminfo, u32.shminfo32, shmall); 1262 error = copyout(&u32.shminfo32, uap->buf, 1263 sizeof(u32.shminfo32)); 1264 break; 1265 case SHM_INFO: 1266 CP(u.shm_info, u32.shm_info32, used_ids); 1267 CP(u.shm_info, u32.shm_info32, shm_rss); 1268 CP(u.shm_info, u32.shm_info32, shm_tot); 1269 CP(u.shm_info, u32.shm_info32, shm_swp); 1270 CP(u.shm_info, u32.shm_info32, swap_attempts); 1271 CP(u.shm_info, u32.shm_info32, swap_successes); 1272 error = copyout(&u32.shm_info32, uap->buf, 1273 sizeof(u32.shm_info32)); 1274 break; 1275 case SHM_STAT: 1276 case IPC_STAT: 1277 freebsd32_ipcperm_out(&u.shmid_ds.shm_perm, 1278 &u32.shmid_ds32.shm_perm); 1279 if (u.shmid_ds.shm_segsz > INT32_MAX) 1280 u32.shmid_ds32.shm_segsz = INT32_MAX; 1281 else 1282 CP(u.shmid_ds, u32.shmid_ds32, shm_segsz); 1283 CP(u.shmid_ds, u32.shmid_ds32, shm_lpid); 1284 CP(u.shmid_ds, u32.shmid_ds32, shm_cpid); 1285 CP(u.shmid_ds, u32.shmid_ds32, shm_nattch); 1286 CP(u.shmid_ds, u32.shmid_ds32, shm_atime); 1287 CP(u.shmid_ds, u32.shmid_ds32, shm_dtime); 1288 CP(u.shmid_ds, u32.shmid_ds32, shm_ctime); 1289 error = copyout(&u32.shmid_ds32, uap->buf, 1290 sizeof(u32.shmid_ds32)); 1291 break; 1292 } 1293 1294 done: 1295 if (error) { 1296 /* Invalidate the return value */ 1297 td->td_retval[0] = -1; 1298 } 1299 return (error); 1300 } 1301 #endif 1302 1303 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1304 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1305 1306 #ifndef CP 1307 #define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0) 1308 #endif 1309 1310 #ifndef _SYS_SYSPROTO_H_ 1311 struct freebsd7_shmctl_args { 1312 int shmid; 1313 int cmd; 1314 struct shmid_ds_old *buf; 1315 }; 1316 #endif 1317 int 1318 freebsd7_shmctl(td, uap) 1319 struct thread *td; 1320 struct freebsd7_shmctl_args *uap; 1321 { 1322 int error = 0; 1323 struct shmid_ds_old old; 1324 struct shmid_ds buf; 1325 size_t bufsz; 1326 1327 /* 1328 * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support 1329 * Linux binaries. If we see the call come through the FreeBSD ABI, 1330 * return an error back to the user since we do not to support this. 1331 */ 1332 if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO || 1333 uap->cmd == SHM_STAT) 1334 return (EINVAL); 1335 1336 /* IPC_SET needs to copyin the buffer before calling kern_shmctl */ 1337 if (uap->cmd == IPC_SET) { 1338 if ((error = copyin(uap->buf, &old, sizeof(old)))) 1339 goto done; 1340 ipcperm_old2new(&old.shm_perm, &buf.shm_perm); 1341 CP(old, buf, shm_segsz); 1342 CP(old, buf, shm_lpid); 1343 CP(old, buf, shm_cpid); 1344 CP(old, buf, shm_nattch); 1345 CP(old, buf, shm_atime); 1346 CP(old, buf, shm_dtime); 1347 CP(old, buf, shm_ctime); 1348 } 1349 1350 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz); 1351 if (error) 1352 goto done; 1353 1354 /* Cases in which we need to copyout */ 1355 switch (uap->cmd) { 1356 case IPC_STAT: 1357 ipcperm_new2old(&buf.shm_perm, &old.shm_perm); 1358 if (buf.shm_segsz > INT_MAX) 1359 old.shm_segsz = INT_MAX; 1360 else 1361 CP(buf, old, shm_segsz); 1362 CP(buf, old, shm_lpid); 1363 CP(buf, old, shm_cpid); 1364 if (buf.shm_nattch > SHRT_MAX) 1365 old.shm_nattch = SHRT_MAX; 1366 else 1367 CP(buf, old, shm_nattch); 1368 CP(buf, old, shm_atime); 1369 CP(buf, old, shm_dtime); 1370 CP(buf, old, shm_ctime); 1371 old.shm_internal = NULL; 1372 error = copyout(&old, uap->buf, sizeof(old)); 1373 break; 1374 } 1375 1376 done: 1377 if (error) { 1378 /* Invalidate the return value */ 1379 td->td_retval[0] = -1; 1380 } 1381 return (error); 1382 } 1383 1384 #endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 || 1385 COMPAT_FREEBSD7 */ 1386 1387 static int 1388 sysvshm_modload(struct module *module, int cmd, void *arg) 1389 { 1390 int error = 0; 1391 1392 switch (cmd) { 1393 case MOD_LOAD: 1394 error = shminit(); 1395 if (error != 0) 1396 shmunload(); 1397 break; 1398 case MOD_UNLOAD: 1399 error = shmunload(); 1400 break; 1401 case MOD_SHUTDOWN: 1402 break; 1403 default: 1404 error = EINVAL; 1405 break; 1406 } 1407 return (error); 1408 } 1409 1410 static moduledata_t sysvshm_mod = { 1411 "sysvshm", 1412 &sysvshm_modload, 1413 NULL 1414 }; 1415 1416 DECLARE_MODULE(sysvshm, sysvshm_mod, SI_SUB_SYSV_SHM, SI_ORDER_FIRST); 1417 MODULE_VERSION(sysvshm, 1);
Cache object: a3c0628034b697eb77d456abdc9e5822
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