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: releng/10.3/sys/kern/sysv_shm.c 284665 2015-06-21 06:28:26Z trasz $"); 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/rwlock.h> 83 #include <sys/stat.h> 84 #include <sys/syscall.h> 85 #include <sys/syscallsubr.h> 86 #include <sys/sysent.h> 87 #include <sys/sysproto.h> 88 #include <sys/jail.h> 89 90 #include <security/mac/mac_framework.h> 91 92 #include <vm/vm.h> 93 #include <vm/vm_param.h> 94 #include <vm/pmap.h> 95 #include <vm/vm_object.h> 96 #include <vm/vm_map.h> 97 #include <vm/vm_page.h> 98 #include <vm/vm_pager.h> 99 100 FEATURE(sysv_shm, "System V shared memory segments support"); 101 102 static MALLOC_DEFINE(M_SHM, "shm", "SVID compatible shared memory segments"); 103 104 static int shmget_allocate_segment(struct thread *td, 105 struct shmget_args *uap, int mode); 106 static int shmget_existing(struct thread *td, struct shmget_args *uap, 107 int mode, int segnum); 108 109 #define SHMSEG_FREE 0x0200 110 #define SHMSEG_REMOVED 0x0400 111 #define SHMSEG_ALLOCATED 0x0800 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(int, bool); 125 static int shm_delete_mapping(struct vmspace *vm, struct shmmap_state *); 126 static void shmrealloc(void); 127 static int shminit(void); 128 static int sysvshm_modload(struct module *, int, void *); 129 static int shmunload(void); 130 static void shmexit_myhook(struct vmspace *vm); 131 static void shmfork_myhook(struct proc *p1, struct proc *p2); 132 static int sysctl_shmsegs(SYSCTL_HANDLER_ARGS); 133 134 /* 135 * Tuneable values. 136 */ 137 #ifndef SHMMAXPGS 138 #define SHMMAXPGS 131072 /* Note: sysv shared memory is swap backed. */ 139 #endif 140 #ifndef SHMMAX 141 #define SHMMAX (SHMMAXPGS*PAGE_SIZE) 142 #endif 143 #ifndef SHMMIN 144 #define SHMMIN 1 145 #endif 146 #ifndef SHMMNI 147 #define SHMMNI 192 148 #endif 149 #ifndef SHMSEG 150 #define SHMSEG 128 151 #endif 152 #ifndef SHMALL 153 #define SHMALL (SHMMAXPGS) 154 #endif 155 156 struct shminfo shminfo = { 157 SHMMAX, 158 SHMMIN, 159 SHMMNI, 160 SHMSEG, 161 SHMALL 162 }; 163 164 static int shm_use_phys; 165 static int shm_allow_removed; 166 167 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmax, CTLFLAG_RW, &shminfo.shmmax, 0, 168 "Maximum shared memory segment size"); 169 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmin, CTLFLAG_RW, &shminfo.shmmin, 0, 170 "Minimum shared memory segment size"); 171 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmni, CTLFLAG_RDTUN, &shminfo.shmmni, 0, 172 "Number of shared memory identifiers"); 173 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmseg, CTLFLAG_RDTUN, &shminfo.shmseg, 0, 174 "Number of segments per process"); 175 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmall, CTLFLAG_RW, &shminfo.shmall, 0, 176 "Maximum number of pages available for shared memory"); 177 SYSCTL_INT(_kern_ipc, OID_AUTO, shm_use_phys, CTLFLAG_RW, 178 &shm_use_phys, 0, "Enable/Disable locking of shared memory pages in core"); 179 SYSCTL_INT(_kern_ipc, OID_AUTO, shm_allow_removed, CTLFLAG_RW, 180 &shm_allow_removed, 0, 181 "Enable/Disable attachment to attached segments marked for removal"); 182 SYSCTL_PROC(_kern_ipc, OID_AUTO, shmsegs, CTLTYPE_OPAQUE | CTLFLAG_RD | 183 CTLFLAG_MPSAFE, NULL, 0, sysctl_shmsegs, "", 184 "Current number of shared memory segments allocated"); 185 186 static struct sx sysvshmsx; 187 #define SYSVSHM_LOCK() sx_xlock(&sysvshmsx) 188 #define SYSVSHM_UNLOCK() sx_xunlock(&sysvshmsx) 189 #define SYSVSHM_ASSERT_LOCKED() sx_assert(&sysvshmsx, SA_XLOCKED) 190 191 static int 192 shm_find_segment_by_key(key_t key) 193 { 194 int i; 195 196 for (i = 0; i < shmalloced; i++) 197 if ((shmsegs[i].u.shm_perm.mode & SHMSEG_ALLOCATED) && 198 shmsegs[i].u.shm_perm.key == key) 199 return (i); 200 return (-1); 201 } 202 203 /* 204 * Finds segment either by shmid if is_shmid is true, or by segnum if 205 * is_shmid is false. 206 */ 207 static struct shmid_kernel * 208 shm_find_segment(int arg, bool is_shmid) 209 { 210 struct shmid_kernel *shmseg; 211 int segnum; 212 213 segnum = is_shmid ? IPCID_TO_IX(arg) : arg; 214 if (segnum < 0 || segnum >= shmalloced) 215 return (NULL); 216 shmseg = &shmsegs[segnum]; 217 if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 || 218 (!shm_allow_removed && 219 (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) != 0) || 220 (is_shmid && shmseg->u.shm_perm.seq != IPCID_TO_SEQ(arg))) 221 return (NULL); 222 return (shmseg); 223 } 224 225 static void 226 shm_deallocate_segment(struct shmid_kernel *shmseg) 227 { 228 vm_size_t size; 229 230 SYSVSHM_ASSERT_LOCKED(); 231 232 vm_object_deallocate(shmseg->object); 233 shmseg->object = NULL; 234 size = round_page(shmseg->u.shm_segsz); 235 shm_committed -= btoc(size); 236 shm_nused--; 237 shmseg->u.shm_perm.mode = SHMSEG_FREE; 238 #ifdef MAC 239 mac_sysvshm_cleanup(shmseg); 240 #endif 241 racct_sub_cred(shmseg->cred, RACCT_NSHM, 1); 242 racct_sub_cred(shmseg->cred, RACCT_SHMSIZE, size); 243 crfree(shmseg->cred); 244 shmseg->cred = NULL; 245 } 246 247 static int 248 shm_delete_mapping(struct vmspace *vm, struct shmmap_state *shmmap_s) 249 { 250 struct shmid_kernel *shmseg; 251 int segnum, result; 252 vm_size_t size; 253 254 SYSVSHM_ASSERT_LOCKED(); 255 segnum = IPCID_TO_IX(shmmap_s->shmid); 256 KASSERT(segnum >= 0 && segnum < shmalloced, 257 ("segnum %d shmalloced %d", segnum, shmalloced)); 258 259 shmseg = &shmsegs[segnum]; 260 size = round_page(shmseg->u.shm_segsz); 261 result = vm_map_remove(&vm->vm_map, shmmap_s->va, shmmap_s->va + size); 262 if (result != KERN_SUCCESS) 263 return (EINVAL); 264 shmmap_s->shmid = -1; 265 shmseg->u.shm_dtime = time_second; 266 if ((--shmseg->u.shm_nattch <= 0) && 267 (shmseg->u.shm_perm.mode & SHMSEG_REMOVED)) { 268 shm_deallocate_segment(shmseg); 269 shm_last_free = segnum; 270 } 271 return (0); 272 } 273 274 static int 275 kern_shmdt_locked(struct thread *td, const void *shmaddr) 276 { 277 struct proc *p = td->td_proc; 278 struct shmmap_state *shmmap_s; 279 #ifdef MAC 280 struct shmid_kernel *shmsegptr; 281 #endif 282 int error, i; 283 284 SYSVSHM_ASSERT_LOCKED(); 285 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 286 return (ENOSYS); 287 shmmap_s = p->p_vmspace->vm_shm; 288 if (shmmap_s == NULL) 289 return (EINVAL); 290 for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) { 291 if (shmmap_s->shmid != -1 && 292 shmmap_s->va == (vm_offset_t)shmaddr) { 293 break; 294 } 295 } 296 if (i == shminfo.shmseg) 297 return (EINVAL); 298 #ifdef MAC 299 shmsegptr = &shmsegs[IPCID_TO_IX(shmmap_s->shmid)]; 300 error = mac_sysvshm_check_shmdt(td->td_ucred, shmsegptr); 301 if (error != 0) 302 return (error); 303 #endif 304 error = shm_delete_mapping(p->p_vmspace, shmmap_s); 305 return (error); 306 } 307 308 #ifndef _SYS_SYSPROTO_H_ 309 struct shmdt_args { 310 const void *shmaddr; 311 }; 312 #endif 313 int 314 sys_shmdt(struct thread *td, struct shmdt_args *uap) 315 { 316 int error; 317 318 SYSVSHM_LOCK(); 319 error = kern_shmdt_locked(td, uap->shmaddr); 320 SYSVSHM_UNLOCK(); 321 return (error); 322 } 323 324 static int 325 kern_shmat_locked(struct thread *td, int shmid, const void *shmaddr, 326 int shmflg) 327 { 328 struct proc *p = td->td_proc; 329 struct shmid_kernel *shmseg; 330 struct shmmap_state *shmmap_s; 331 vm_offset_t attach_va; 332 vm_prot_t prot; 333 vm_size_t size; 334 int error, i, rv; 335 336 SYSVSHM_ASSERT_LOCKED(); 337 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 338 return (ENOSYS); 339 shmmap_s = p->p_vmspace->vm_shm; 340 if (shmmap_s == NULL) { 341 shmmap_s = malloc(shminfo.shmseg * sizeof(struct shmmap_state), 342 M_SHM, M_WAITOK); 343 for (i = 0; i < shminfo.shmseg; i++) 344 shmmap_s[i].shmid = -1; 345 KASSERT(p->p_vmspace->vm_shm == NULL, ("raced")); 346 p->p_vmspace->vm_shm = shmmap_s; 347 } 348 shmseg = shm_find_segment(shmid, true); 349 if (shmseg == NULL) 350 return (EINVAL); 351 error = ipcperm(td, &shmseg->u.shm_perm, 352 (shmflg & SHM_RDONLY) ? IPC_R : IPC_R|IPC_W); 353 if (error != 0) 354 return (error); 355 #ifdef MAC 356 error = mac_sysvshm_check_shmat(td->td_ucred, shmseg, shmflg); 357 if (error != 0) 358 return (error); 359 #endif 360 for (i = 0; i < shminfo.shmseg; i++) { 361 if (shmmap_s->shmid == -1) 362 break; 363 shmmap_s++; 364 } 365 if (i >= shminfo.shmseg) 366 return (EMFILE); 367 size = round_page(shmseg->u.shm_segsz); 368 prot = VM_PROT_READ; 369 if ((shmflg & SHM_RDONLY) == 0) 370 prot |= VM_PROT_WRITE; 371 if (shmaddr != NULL) { 372 if ((shmflg & SHM_RND) != 0) 373 attach_va = (vm_offset_t)shmaddr & ~(SHMLBA-1); 374 else if (((vm_offset_t)shmaddr & (SHMLBA-1)) == 0) 375 attach_va = (vm_offset_t)shmaddr; 376 else 377 return (EINVAL); 378 } else { 379 /* 380 * This is just a hint to vm_map_find() about where to 381 * put it. 382 */ 383 PROC_LOCK(p); 384 attach_va = round_page((vm_offset_t)p->p_vmspace->vm_daddr + 385 lim_max(p, RLIMIT_DATA)); 386 PROC_UNLOCK(p); 387 } 388 389 vm_object_reference(shmseg->object); 390 rv = vm_map_find(&p->p_vmspace->vm_map, shmseg->object, 391 0, &attach_va, size, 0, shmaddr != NULL ? VMFS_NO_SPACE : 392 VMFS_OPTIMAL_SPACE, prot, prot, MAP_INHERIT_SHARE); 393 if (rv != KERN_SUCCESS) { 394 vm_object_deallocate(shmseg->object); 395 return (ENOMEM); 396 } 397 398 shmmap_s->va = attach_va; 399 shmmap_s->shmid = shmid; 400 shmseg->u.shm_lpid = p->p_pid; 401 shmseg->u.shm_atime = time_second; 402 shmseg->u.shm_nattch++; 403 td->td_retval[0] = attach_va; 404 return (error); 405 } 406 407 int 408 kern_shmat(struct thread *td, int shmid, const void *shmaddr, int shmflg) 409 { 410 int error; 411 412 SYSVSHM_LOCK(); 413 error = kern_shmat_locked(td, shmid, shmaddr, shmflg); 414 SYSVSHM_UNLOCK(); 415 return (error); 416 } 417 418 #ifndef _SYS_SYSPROTO_H_ 419 struct shmat_args { 420 int shmid; 421 const void *shmaddr; 422 int shmflg; 423 }; 424 #endif 425 int 426 sys_shmat(struct thread *td, struct shmat_args *uap) 427 { 428 429 return (kern_shmat(td, uap->shmid, uap->shmaddr, uap->shmflg)); 430 } 431 432 static int 433 kern_shmctl_locked(struct thread *td, int shmid, int cmd, void *buf, 434 size_t *bufsz) 435 { 436 struct shmid_kernel *shmseg; 437 struct shmid_ds *shmidp; 438 struct shm_info shm_info; 439 int error; 440 441 SYSVSHM_ASSERT_LOCKED(); 442 443 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 444 return (ENOSYS); 445 446 error = 0; 447 switch (cmd) { 448 /* 449 * It is possible that kern_shmctl is being called from the Linux ABI 450 * layer, in which case, we will need to implement IPC_INFO. It should 451 * be noted that other shmctl calls will be funneled through here for 452 * Linix binaries as well. 453 * 454 * NB: The Linux ABI layer will convert this data to structure(s) more 455 * consistent with the Linux ABI. 456 */ 457 case IPC_INFO: 458 memcpy(buf, &shminfo, sizeof(shminfo)); 459 if (bufsz) 460 *bufsz = sizeof(shminfo); 461 td->td_retval[0] = shmalloced; 462 return (0); 463 case SHM_INFO: { 464 shm_info.used_ids = shm_nused; 465 shm_info.shm_rss = 0; /*XXX where to get from ? */ 466 shm_info.shm_tot = 0; /*XXX where to get from ? */ 467 shm_info.shm_swp = 0; /*XXX where to get from ? */ 468 shm_info.swap_attempts = 0; /*XXX where to get from ? */ 469 shm_info.swap_successes = 0; /*XXX where to get from ? */ 470 memcpy(buf, &shm_info, sizeof(shm_info)); 471 if (bufsz != NULL) 472 *bufsz = sizeof(shm_info); 473 td->td_retval[0] = shmalloced; 474 return (0); 475 } 476 } 477 shmseg = shm_find_segment(shmid, cmd != SHM_STAT); 478 if (shmseg == NULL) 479 return (EINVAL); 480 #ifdef MAC 481 error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, cmd); 482 if (error != 0) 483 return (error); 484 #endif 485 switch (cmd) { 486 case SHM_STAT: 487 case IPC_STAT: 488 error = ipcperm(td, &shmseg->u.shm_perm, IPC_R); 489 if (error != 0) 490 return (error); 491 memcpy(buf, &shmseg->u, sizeof(struct shmid_ds)); 492 if (bufsz != NULL) 493 *bufsz = sizeof(struct shmid_ds); 494 if (cmd == SHM_STAT) { 495 td->td_retval[0] = IXSEQ_TO_IPCID(shmid, 496 shmseg->u.shm_perm); 497 } 498 break; 499 case IPC_SET: 500 shmidp = (struct shmid_ds *)buf; 501 error = ipcperm(td, &shmseg->u.shm_perm, IPC_M); 502 if (error != 0) 503 return (error); 504 shmseg->u.shm_perm.uid = shmidp->shm_perm.uid; 505 shmseg->u.shm_perm.gid = shmidp->shm_perm.gid; 506 shmseg->u.shm_perm.mode = 507 (shmseg->u.shm_perm.mode & ~ACCESSPERMS) | 508 (shmidp->shm_perm.mode & ACCESSPERMS); 509 shmseg->u.shm_ctime = time_second; 510 break; 511 case IPC_RMID: 512 error = ipcperm(td, &shmseg->u.shm_perm, IPC_M); 513 if (error != 0) 514 return (error); 515 shmseg->u.shm_perm.key = IPC_PRIVATE; 516 shmseg->u.shm_perm.mode |= SHMSEG_REMOVED; 517 if (shmseg->u.shm_nattch <= 0) { 518 shm_deallocate_segment(shmseg); 519 shm_last_free = IPCID_TO_IX(shmid); 520 } 521 break; 522 #if 0 523 case SHM_LOCK: 524 case SHM_UNLOCK: 525 #endif 526 default: 527 error = EINVAL; 528 break; 529 } 530 return (error); 531 } 532 533 int 534 kern_shmctl(struct thread *td, int shmid, int cmd, void *buf, size_t *bufsz) 535 { 536 int error; 537 538 SYSVSHM_LOCK(); 539 error = kern_shmctl_locked(td, shmid, cmd, buf, bufsz); 540 SYSVSHM_UNLOCK(); 541 return (error); 542 } 543 544 545 #ifndef _SYS_SYSPROTO_H_ 546 struct shmctl_args { 547 int shmid; 548 int cmd; 549 struct shmid_ds *buf; 550 }; 551 #endif 552 int 553 sys_shmctl(struct thread *td, struct shmctl_args *uap) 554 { 555 int error = 0; 556 struct shmid_ds buf; 557 size_t bufsz; 558 559 /* 560 * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support 561 * Linux binaries. If we see the call come through the FreeBSD ABI, 562 * return an error back to the user since we do not to support this. 563 */ 564 if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO || 565 uap->cmd == SHM_STAT) 566 return (EINVAL); 567 568 /* IPC_SET needs to copyin the buffer before calling kern_shmctl */ 569 if (uap->cmd == IPC_SET) { 570 if ((error = copyin(uap->buf, &buf, sizeof(struct shmid_ds)))) 571 goto done; 572 } 573 574 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz); 575 if (error) 576 goto done; 577 578 /* Cases in which we need to copyout */ 579 switch (uap->cmd) { 580 case IPC_STAT: 581 error = copyout(&buf, uap->buf, bufsz); 582 break; 583 } 584 585 done: 586 if (error) { 587 /* Invalidate the return value */ 588 td->td_retval[0] = -1; 589 } 590 return (error); 591 } 592 593 594 static int 595 shmget_existing(struct thread *td, struct shmget_args *uap, int mode, 596 int segnum) 597 { 598 struct shmid_kernel *shmseg; 599 #ifdef MAC 600 int error; 601 #endif 602 603 SYSVSHM_ASSERT_LOCKED(); 604 KASSERT(segnum >= 0 && segnum < shmalloced, 605 ("segnum %d shmalloced %d", segnum, shmalloced)); 606 shmseg = &shmsegs[segnum]; 607 if ((uap->shmflg & (IPC_CREAT | IPC_EXCL)) == (IPC_CREAT | IPC_EXCL)) 608 return (EEXIST); 609 #ifdef MAC 610 error = mac_sysvshm_check_shmget(td->td_ucred, shmseg, uap->shmflg); 611 if (error != 0) 612 return (error); 613 #endif 614 if (uap->size != 0 && uap->size > shmseg->u.shm_segsz) 615 return (EINVAL); 616 td->td_retval[0] = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm); 617 return (0); 618 } 619 620 static int 621 shmget_allocate_segment(struct thread *td, struct shmget_args *uap, int mode) 622 { 623 struct ucred *cred = td->td_ucred; 624 struct shmid_kernel *shmseg; 625 vm_object_t shm_object; 626 int i, segnum; 627 size_t size; 628 629 SYSVSHM_ASSERT_LOCKED(); 630 631 if (uap->size < shminfo.shmmin || uap->size > shminfo.shmmax) 632 return (EINVAL); 633 if (shm_nused >= shminfo.shmmni) /* Any shmids left? */ 634 return (ENOSPC); 635 size = round_page(uap->size); 636 if (shm_committed + btoc(size) > shminfo.shmall) 637 return (ENOMEM); 638 if (shm_last_free < 0) { 639 shmrealloc(); /* Maybe expand the shmsegs[] array. */ 640 for (i = 0; i < shmalloced; i++) 641 if (shmsegs[i].u.shm_perm.mode & SHMSEG_FREE) 642 break; 643 if (i == shmalloced) 644 return (ENOSPC); 645 segnum = i; 646 } else { 647 segnum = shm_last_free; 648 shm_last_free = -1; 649 } 650 KASSERT(segnum >= 0 && segnum < shmalloced, 651 ("segnum %d shmalloced %d", segnum, shmalloced)); 652 shmseg = &shmsegs[segnum]; 653 #ifdef RACCT 654 if (racct_enable) { 655 PROC_LOCK(td->td_proc); 656 if (racct_add(td->td_proc, RACCT_NSHM, 1)) { 657 PROC_UNLOCK(td->td_proc); 658 return (ENOSPC); 659 } 660 if (racct_add(td->td_proc, RACCT_SHMSIZE, size)) { 661 racct_sub(td->td_proc, RACCT_NSHM, 1); 662 PROC_UNLOCK(td->td_proc); 663 return (ENOMEM); 664 } 665 PROC_UNLOCK(td->td_proc); 666 } 667 #endif 668 669 /* 670 * We make sure that we have allocated a pager before we need 671 * to. 672 */ 673 shm_object = vm_pager_allocate(shm_use_phys ? OBJT_PHYS : OBJT_SWAP, 674 0, size, VM_PROT_DEFAULT, 0, cred); 675 if (shm_object == NULL) { 676 #ifdef RACCT 677 if (racct_enable) { 678 PROC_LOCK(td->td_proc); 679 racct_sub(td->td_proc, RACCT_NSHM, 1); 680 racct_sub(td->td_proc, RACCT_SHMSIZE, size); 681 PROC_UNLOCK(td->td_proc); 682 } 683 #endif 684 return (ENOMEM); 685 } 686 shm_object->pg_color = 0; 687 VM_OBJECT_WLOCK(shm_object); 688 vm_object_clear_flag(shm_object, OBJ_ONEMAPPING); 689 vm_object_set_flag(shm_object, OBJ_COLORED | OBJ_NOSPLIT); 690 VM_OBJECT_WUNLOCK(shm_object); 691 692 shmseg->object = shm_object; 693 shmseg->u.shm_perm.cuid = shmseg->u.shm_perm.uid = cred->cr_uid; 694 shmseg->u.shm_perm.cgid = shmseg->u.shm_perm.gid = cred->cr_gid; 695 shmseg->u.shm_perm.mode = (mode & ACCESSPERMS) | SHMSEG_ALLOCATED; 696 shmseg->u.shm_perm.key = uap->key; 697 shmseg->u.shm_perm.seq = (shmseg->u.shm_perm.seq + 1) & 0x7fff; 698 shmseg->cred = crhold(cred); 699 shmseg->u.shm_segsz = uap->size; 700 shmseg->u.shm_cpid = td->td_proc->p_pid; 701 shmseg->u.shm_lpid = shmseg->u.shm_nattch = 0; 702 shmseg->u.shm_atime = shmseg->u.shm_dtime = 0; 703 #ifdef MAC 704 mac_sysvshm_create(cred, shmseg); 705 #endif 706 shmseg->u.shm_ctime = time_second; 707 shm_committed += btoc(size); 708 shm_nused++; 709 td->td_retval[0] = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm); 710 711 return (0); 712 } 713 714 #ifndef _SYS_SYSPROTO_H_ 715 struct shmget_args { 716 key_t key; 717 size_t size; 718 int shmflg; 719 }; 720 #endif 721 int 722 sys_shmget(struct thread *td, struct shmget_args *uap) 723 { 724 int segnum, mode; 725 int error; 726 727 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 728 return (ENOSYS); 729 mode = uap->shmflg & ACCESSPERMS; 730 SYSVSHM_LOCK(); 731 if (uap->key == IPC_PRIVATE) { 732 error = shmget_allocate_segment(td, uap, mode); 733 } else { 734 segnum = shm_find_segment_by_key(uap->key); 735 if (segnum >= 0) 736 error = shmget_existing(td, uap, mode, segnum); 737 else if ((uap->shmflg & IPC_CREAT) == 0) 738 error = ENOENT; 739 else 740 error = shmget_allocate_segment(td, uap, mode); 741 } 742 SYSVSHM_UNLOCK(); 743 return (error); 744 } 745 746 static void 747 shmfork_myhook(struct proc *p1, struct proc *p2) 748 { 749 struct shmmap_state *shmmap_s; 750 size_t size; 751 int i; 752 753 SYSVSHM_LOCK(); 754 size = shminfo.shmseg * sizeof(struct shmmap_state); 755 shmmap_s = malloc(size, M_SHM, M_WAITOK); 756 bcopy(p1->p_vmspace->vm_shm, shmmap_s, size); 757 p2->p_vmspace->vm_shm = shmmap_s; 758 for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) { 759 if (shmmap_s->shmid != -1) { 760 KASSERT(IPCID_TO_IX(shmmap_s->shmid) >= 0 && 761 IPCID_TO_IX(shmmap_s->shmid) < shmalloced, 762 ("segnum %d shmalloced %d", 763 IPCID_TO_IX(shmmap_s->shmid), shmalloced)); 764 shmsegs[IPCID_TO_IX(shmmap_s->shmid)].u.shm_nattch++; 765 } 766 } 767 SYSVSHM_UNLOCK(); 768 } 769 770 static void 771 shmexit_myhook(struct vmspace *vm) 772 { 773 struct shmmap_state *base, *shm; 774 int i; 775 776 base = vm->vm_shm; 777 if (base != NULL) { 778 vm->vm_shm = NULL; 779 SYSVSHM_LOCK(); 780 for (i = 0, shm = base; i < shminfo.shmseg; i++, shm++) { 781 if (shm->shmid != -1) 782 shm_delete_mapping(vm, shm); 783 } 784 SYSVSHM_UNLOCK(); 785 free(base, M_SHM); 786 } 787 } 788 789 static void 790 shmrealloc(void) 791 { 792 struct shmid_kernel *newsegs; 793 int i; 794 795 SYSVSHM_ASSERT_LOCKED(); 796 797 if (shmalloced >= shminfo.shmmni) 798 return; 799 800 newsegs = malloc(shminfo.shmmni * sizeof(*newsegs), M_SHM, M_WAITOK); 801 for (i = 0; i < shmalloced; i++) 802 bcopy(&shmsegs[i], &newsegs[i], sizeof(newsegs[0])); 803 for (; i < shminfo.shmmni; i++) { 804 shmsegs[i].u.shm_perm.mode = SHMSEG_FREE; 805 shmsegs[i].u.shm_perm.seq = 0; 806 #ifdef MAC 807 mac_sysvshm_init(&shmsegs[i]); 808 #endif 809 } 810 free(shmsegs, M_SHM); 811 shmsegs = newsegs; 812 shmalloced = shminfo.shmmni; 813 } 814 815 static struct syscall_helper_data shm_syscalls[] = { 816 SYSCALL_INIT_HELPER(shmat), 817 SYSCALL_INIT_HELPER(shmctl), 818 SYSCALL_INIT_HELPER(shmdt), 819 SYSCALL_INIT_HELPER(shmget), 820 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 821 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 822 SYSCALL_INIT_HELPER_COMPAT(freebsd7_shmctl), 823 #endif 824 #if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43)) 825 SYSCALL_INIT_HELPER(shmsys), 826 #endif 827 SYSCALL_INIT_LAST 828 }; 829 830 #ifdef COMPAT_FREEBSD32 831 #include <compat/freebsd32/freebsd32.h> 832 #include <compat/freebsd32/freebsd32_ipc.h> 833 #include <compat/freebsd32/freebsd32_proto.h> 834 #include <compat/freebsd32/freebsd32_signal.h> 835 #include <compat/freebsd32/freebsd32_syscall.h> 836 #include <compat/freebsd32/freebsd32_util.h> 837 838 static struct syscall_helper_data shm32_syscalls[] = { 839 SYSCALL32_INIT_HELPER_COMPAT(shmat), 840 SYSCALL32_INIT_HELPER_COMPAT(shmdt), 841 SYSCALL32_INIT_HELPER_COMPAT(shmget), 842 SYSCALL32_INIT_HELPER(freebsd32_shmsys), 843 SYSCALL32_INIT_HELPER(freebsd32_shmctl), 844 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 845 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 846 SYSCALL32_INIT_HELPER(freebsd7_freebsd32_shmctl), 847 #endif 848 SYSCALL_INIT_LAST 849 }; 850 #endif 851 852 static int 853 shminit(void) 854 { 855 int i, error; 856 857 #ifndef BURN_BRIDGES 858 if (TUNABLE_ULONG_FETCH("kern.ipc.shmmaxpgs", &shminfo.shmall) != 0) 859 printf("kern.ipc.shmmaxpgs is now called kern.ipc.shmall!\n"); 860 #endif 861 TUNABLE_ULONG_FETCH("kern.ipc.shmall", &shminfo.shmall); 862 if (!TUNABLE_ULONG_FETCH("kern.ipc.shmmax", &shminfo.shmmax)) { 863 /* Initialize shmmax dealing with possible overflow. */ 864 for (i = PAGE_SIZE; i > 0; i--) { 865 shminfo.shmmax = shminfo.shmall * i; 866 if (shminfo.shmmax >= shminfo.shmall) 867 break; 868 } 869 } 870 TUNABLE_ULONG_FETCH("kern.ipc.shmmin", &shminfo.shmmin); 871 TUNABLE_ULONG_FETCH("kern.ipc.shmmni", &shminfo.shmmni); 872 TUNABLE_ULONG_FETCH("kern.ipc.shmseg", &shminfo.shmseg); 873 TUNABLE_INT_FETCH("kern.ipc.shm_use_phys", &shm_use_phys); 874 875 shmalloced = shminfo.shmmni; 876 shmsegs = malloc(shmalloced * sizeof(shmsegs[0]), M_SHM, M_WAITOK); 877 for (i = 0; i < shmalloced; i++) { 878 shmsegs[i].u.shm_perm.mode = SHMSEG_FREE; 879 shmsegs[i].u.shm_perm.seq = 0; 880 #ifdef MAC 881 mac_sysvshm_init(&shmsegs[i]); 882 #endif 883 } 884 shm_last_free = 0; 885 shm_nused = 0; 886 shm_committed = 0; 887 sx_init(&sysvshmsx, "sysvshmsx"); 888 shmexit_hook = &shmexit_myhook; 889 shmfork_hook = &shmfork_myhook; 890 891 error = syscall_helper_register(shm_syscalls); 892 if (error != 0) 893 return (error); 894 #ifdef COMPAT_FREEBSD32 895 error = syscall32_helper_register(shm32_syscalls); 896 if (error != 0) 897 return (error); 898 #endif 899 return (0); 900 } 901 902 static int 903 shmunload(void) 904 { 905 int i; 906 907 if (shm_nused > 0) 908 return (EBUSY); 909 910 #ifdef COMPAT_FREEBSD32 911 syscall32_helper_unregister(shm32_syscalls); 912 #endif 913 syscall_helper_unregister(shm_syscalls); 914 915 for (i = 0; i < shmalloced; i++) { 916 #ifdef MAC 917 mac_sysvshm_destroy(&shmsegs[i]); 918 #endif 919 /* 920 * Objects might be still mapped into the processes 921 * address spaces. Actual free would happen on the 922 * last mapping destruction. 923 */ 924 if (shmsegs[i].u.shm_perm.mode != SHMSEG_FREE) 925 vm_object_deallocate(shmsegs[i].object); 926 } 927 free(shmsegs, M_SHM); 928 shmexit_hook = NULL; 929 shmfork_hook = NULL; 930 sx_destroy(&sysvshmsx); 931 return (0); 932 } 933 934 static int 935 sysctl_shmsegs(SYSCTL_HANDLER_ARGS) 936 { 937 int error; 938 939 SYSVSHM_LOCK(); 940 error = SYSCTL_OUT(req, shmsegs, shmalloced * sizeof(shmsegs[0])); 941 SYSVSHM_UNLOCK(); 942 return (error); 943 } 944 945 #if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43)) 946 struct oshmid_ds { 947 struct ipc_perm_old shm_perm; /* operation perms */ 948 int shm_segsz; /* size of segment (bytes) */ 949 u_short shm_cpid; /* pid, creator */ 950 u_short shm_lpid; /* pid, last operation */ 951 short shm_nattch; /* no. of current attaches */ 952 time_t shm_atime; /* last attach time */ 953 time_t shm_dtime; /* last detach time */ 954 time_t shm_ctime; /* last change time */ 955 void *shm_handle; /* internal handle for shm segment */ 956 }; 957 958 struct oshmctl_args { 959 int shmid; 960 int cmd; 961 struct oshmid_ds *ubuf; 962 }; 963 964 static int 965 oshmctl(struct thread *td, struct oshmctl_args *uap) 966 { 967 #ifdef COMPAT_43 968 int error = 0; 969 struct shmid_kernel *shmseg; 970 struct oshmid_ds outbuf; 971 972 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 973 return (ENOSYS); 974 if (uap->cmd != IPC_STAT) { 975 return (freebsd7_shmctl(td, 976 (struct freebsd7_shmctl_args *)uap)); 977 } 978 SYSVSHM_LOCK(); 979 shmseg = shm_find_segment(uap->shmid, true); 980 if (shmseg == NULL) { 981 SYSVSHM_UNLOCK(); 982 return (EINVAL); 983 } 984 error = ipcperm(td, &shmseg->u.shm_perm, IPC_R); 985 if (error != 0) { 986 SYSVSHM_UNLOCK(); 987 return (error); 988 } 989 #ifdef MAC 990 error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, uap->cmd); 991 if (error != 0) { 992 SYSVSHM_UNLOCK(); 993 return (error); 994 } 995 #endif 996 ipcperm_new2old(&shmseg->u.shm_perm, &outbuf.shm_perm); 997 outbuf.shm_segsz = shmseg->u.shm_segsz; 998 outbuf.shm_cpid = shmseg->u.shm_cpid; 999 outbuf.shm_lpid = shmseg->u.shm_lpid; 1000 outbuf.shm_nattch = shmseg->u.shm_nattch; 1001 outbuf.shm_atime = shmseg->u.shm_atime; 1002 outbuf.shm_dtime = shmseg->u.shm_dtime; 1003 outbuf.shm_ctime = shmseg->u.shm_ctime; 1004 outbuf.shm_handle = shmseg->object; 1005 SYSVSHM_UNLOCK(); 1006 error = copyout(&outbuf, uap->ubuf, sizeof(outbuf)); 1007 return (error); 1008 #else 1009 return (EINVAL); 1010 #endif 1011 } 1012 1013 /* XXX casting to (sy_call_t *) is bogus, as usual. */ 1014 static sy_call_t *shmcalls[] = { 1015 (sy_call_t *)sys_shmat, (sy_call_t *)oshmctl, 1016 (sy_call_t *)sys_shmdt, (sy_call_t *)sys_shmget, 1017 (sy_call_t *)freebsd7_shmctl 1018 }; 1019 1020 #ifndef _SYS_SYSPROTO_H_ 1021 /* XXX actually varargs. */ 1022 struct shmsys_args { 1023 int which; 1024 int a2; 1025 int a3; 1026 int a4; 1027 }; 1028 #endif 1029 int 1030 sys_shmsys(struct thread *td, struct shmsys_args *uap) 1031 { 1032 int error; 1033 1034 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 1035 return (ENOSYS); 1036 if (uap->which < 0 || uap->which >= nitems(shmcalls)) 1037 return (EINVAL); 1038 error = (*shmcalls[uap->which])(td, &uap->a2); 1039 return (error); 1040 } 1041 1042 #endif /* i386 && (COMPAT_FREEBSD4 || COMPAT_43) */ 1043 1044 #ifdef COMPAT_FREEBSD32 1045 1046 int 1047 freebsd32_shmsys(struct thread *td, struct freebsd32_shmsys_args *uap) 1048 { 1049 1050 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1051 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1052 switch (uap->which) { 1053 case 0: { /* shmat */ 1054 struct shmat_args ap; 1055 1056 ap.shmid = uap->a2; 1057 ap.shmaddr = PTRIN(uap->a3); 1058 ap.shmflg = uap->a4; 1059 return (sysent[SYS_shmat].sy_call(td, &ap)); 1060 } 1061 case 2: { /* shmdt */ 1062 struct shmdt_args ap; 1063 1064 ap.shmaddr = PTRIN(uap->a2); 1065 return (sysent[SYS_shmdt].sy_call(td, &ap)); 1066 } 1067 case 3: { /* shmget */ 1068 struct shmget_args ap; 1069 1070 ap.key = uap->a2; 1071 ap.size = uap->a3; 1072 ap.shmflg = uap->a4; 1073 return (sysent[SYS_shmget].sy_call(td, &ap)); 1074 } 1075 case 4: { /* shmctl */ 1076 struct freebsd7_freebsd32_shmctl_args ap; 1077 1078 ap.shmid = uap->a2; 1079 ap.cmd = uap->a3; 1080 ap.buf = PTRIN(uap->a4); 1081 return (freebsd7_freebsd32_shmctl(td, &ap)); 1082 } 1083 case 1: /* oshmctl */ 1084 default: 1085 return (EINVAL); 1086 } 1087 #else 1088 return (nosys(td, NULL)); 1089 #endif 1090 } 1091 1092 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1093 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1094 int 1095 freebsd7_freebsd32_shmctl(struct thread *td, 1096 struct freebsd7_freebsd32_shmctl_args *uap) 1097 { 1098 int error = 0; 1099 union { 1100 struct shmid_ds shmid_ds; 1101 struct shm_info shm_info; 1102 struct shminfo shminfo; 1103 } u; 1104 union { 1105 struct shmid_ds32_old shmid_ds32; 1106 struct shm_info32 shm_info32; 1107 struct shminfo32 shminfo32; 1108 } u32; 1109 size_t sz; 1110 1111 if (uap->cmd == IPC_SET) { 1112 if ((error = copyin(uap->buf, &u32.shmid_ds32, 1113 sizeof(u32.shmid_ds32)))) 1114 goto done; 1115 freebsd32_ipcperm_old_in(&u32.shmid_ds32.shm_perm, 1116 &u.shmid_ds.shm_perm); 1117 CP(u32.shmid_ds32, u.shmid_ds, shm_segsz); 1118 CP(u32.shmid_ds32, u.shmid_ds, shm_lpid); 1119 CP(u32.shmid_ds32, u.shmid_ds, shm_cpid); 1120 CP(u32.shmid_ds32, u.shmid_ds, shm_nattch); 1121 CP(u32.shmid_ds32, u.shmid_ds, shm_atime); 1122 CP(u32.shmid_ds32, u.shmid_ds, shm_dtime); 1123 CP(u32.shmid_ds32, u.shmid_ds, shm_ctime); 1124 } 1125 1126 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz); 1127 if (error) 1128 goto done; 1129 1130 /* Cases in which we need to copyout */ 1131 switch (uap->cmd) { 1132 case IPC_INFO: 1133 CP(u.shminfo, u32.shminfo32, shmmax); 1134 CP(u.shminfo, u32.shminfo32, shmmin); 1135 CP(u.shminfo, u32.shminfo32, shmmni); 1136 CP(u.shminfo, u32.shminfo32, shmseg); 1137 CP(u.shminfo, u32.shminfo32, shmall); 1138 error = copyout(&u32.shminfo32, uap->buf, 1139 sizeof(u32.shminfo32)); 1140 break; 1141 case SHM_INFO: 1142 CP(u.shm_info, u32.shm_info32, used_ids); 1143 CP(u.shm_info, u32.shm_info32, shm_rss); 1144 CP(u.shm_info, u32.shm_info32, shm_tot); 1145 CP(u.shm_info, u32.shm_info32, shm_swp); 1146 CP(u.shm_info, u32.shm_info32, swap_attempts); 1147 CP(u.shm_info, u32.shm_info32, swap_successes); 1148 error = copyout(&u32.shm_info32, uap->buf, 1149 sizeof(u32.shm_info32)); 1150 break; 1151 case SHM_STAT: 1152 case IPC_STAT: 1153 freebsd32_ipcperm_old_out(&u.shmid_ds.shm_perm, 1154 &u32.shmid_ds32.shm_perm); 1155 if (u.shmid_ds.shm_segsz > INT32_MAX) 1156 u32.shmid_ds32.shm_segsz = INT32_MAX; 1157 else 1158 CP(u.shmid_ds, u32.shmid_ds32, shm_segsz); 1159 CP(u.shmid_ds, u32.shmid_ds32, shm_lpid); 1160 CP(u.shmid_ds, u32.shmid_ds32, shm_cpid); 1161 CP(u.shmid_ds, u32.shmid_ds32, shm_nattch); 1162 CP(u.shmid_ds, u32.shmid_ds32, shm_atime); 1163 CP(u.shmid_ds, u32.shmid_ds32, shm_dtime); 1164 CP(u.shmid_ds, u32.shmid_ds32, shm_ctime); 1165 u32.shmid_ds32.shm_internal = 0; 1166 error = copyout(&u32.shmid_ds32, uap->buf, 1167 sizeof(u32.shmid_ds32)); 1168 break; 1169 } 1170 1171 done: 1172 if (error) { 1173 /* Invalidate the return value */ 1174 td->td_retval[0] = -1; 1175 } 1176 return (error); 1177 } 1178 #endif 1179 1180 int 1181 freebsd32_shmctl(struct thread *td, struct freebsd32_shmctl_args *uap) 1182 { 1183 int error = 0; 1184 union { 1185 struct shmid_ds shmid_ds; 1186 struct shm_info shm_info; 1187 struct shminfo shminfo; 1188 } u; 1189 union { 1190 struct shmid_ds32 shmid_ds32; 1191 struct shm_info32 shm_info32; 1192 struct shminfo32 shminfo32; 1193 } u32; 1194 size_t sz; 1195 1196 if (uap->cmd == IPC_SET) { 1197 if ((error = copyin(uap->buf, &u32.shmid_ds32, 1198 sizeof(u32.shmid_ds32)))) 1199 goto done; 1200 freebsd32_ipcperm_in(&u32.shmid_ds32.shm_perm, 1201 &u.shmid_ds.shm_perm); 1202 CP(u32.shmid_ds32, u.shmid_ds, shm_segsz); 1203 CP(u32.shmid_ds32, u.shmid_ds, shm_lpid); 1204 CP(u32.shmid_ds32, u.shmid_ds, shm_cpid); 1205 CP(u32.shmid_ds32, u.shmid_ds, shm_nattch); 1206 CP(u32.shmid_ds32, u.shmid_ds, shm_atime); 1207 CP(u32.shmid_ds32, u.shmid_ds, shm_dtime); 1208 CP(u32.shmid_ds32, u.shmid_ds, shm_ctime); 1209 } 1210 1211 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz); 1212 if (error) 1213 goto done; 1214 1215 /* Cases in which we need to copyout */ 1216 switch (uap->cmd) { 1217 case IPC_INFO: 1218 CP(u.shminfo, u32.shminfo32, shmmax); 1219 CP(u.shminfo, u32.shminfo32, shmmin); 1220 CP(u.shminfo, u32.shminfo32, shmmni); 1221 CP(u.shminfo, u32.shminfo32, shmseg); 1222 CP(u.shminfo, u32.shminfo32, shmall); 1223 error = copyout(&u32.shminfo32, uap->buf, 1224 sizeof(u32.shminfo32)); 1225 break; 1226 case SHM_INFO: 1227 CP(u.shm_info, u32.shm_info32, used_ids); 1228 CP(u.shm_info, u32.shm_info32, shm_rss); 1229 CP(u.shm_info, u32.shm_info32, shm_tot); 1230 CP(u.shm_info, u32.shm_info32, shm_swp); 1231 CP(u.shm_info, u32.shm_info32, swap_attempts); 1232 CP(u.shm_info, u32.shm_info32, swap_successes); 1233 error = copyout(&u32.shm_info32, uap->buf, 1234 sizeof(u32.shm_info32)); 1235 break; 1236 case SHM_STAT: 1237 case IPC_STAT: 1238 freebsd32_ipcperm_out(&u.shmid_ds.shm_perm, 1239 &u32.shmid_ds32.shm_perm); 1240 if (u.shmid_ds.shm_segsz > INT32_MAX) 1241 u32.shmid_ds32.shm_segsz = INT32_MAX; 1242 else 1243 CP(u.shmid_ds, u32.shmid_ds32, shm_segsz); 1244 CP(u.shmid_ds, u32.shmid_ds32, shm_lpid); 1245 CP(u.shmid_ds, u32.shmid_ds32, shm_cpid); 1246 CP(u.shmid_ds, u32.shmid_ds32, shm_nattch); 1247 CP(u.shmid_ds, u32.shmid_ds32, shm_atime); 1248 CP(u.shmid_ds, u32.shmid_ds32, shm_dtime); 1249 CP(u.shmid_ds, u32.shmid_ds32, shm_ctime); 1250 error = copyout(&u32.shmid_ds32, uap->buf, 1251 sizeof(u32.shmid_ds32)); 1252 break; 1253 } 1254 1255 done: 1256 if (error) { 1257 /* Invalidate the return value */ 1258 td->td_retval[0] = -1; 1259 } 1260 return (error); 1261 } 1262 #endif 1263 1264 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1265 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1266 1267 #ifndef CP 1268 #define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0) 1269 #endif 1270 1271 #ifndef _SYS_SYSPROTO_H_ 1272 struct freebsd7_shmctl_args { 1273 int shmid; 1274 int cmd; 1275 struct shmid_ds_old *buf; 1276 }; 1277 #endif 1278 int 1279 freebsd7_shmctl(struct thread *td, struct freebsd7_shmctl_args *uap) 1280 { 1281 int error = 0; 1282 struct shmid_ds_old old; 1283 struct shmid_ds buf; 1284 size_t bufsz; 1285 1286 /* 1287 * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support 1288 * Linux binaries. If we see the call come through the FreeBSD ABI, 1289 * return an error back to the user since we do not to support this. 1290 */ 1291 if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO || 1292 uap->cmd == SHM_STAT) 1293 return (EINVAL); 1294 1295 /* IPC_SET needs to copyin the buffer before calling kern_shmctl */ 1296 if (uap->cmd == IPC_SET) { 1297 if ((error = copyin(uap->buf, &old, sizeof(old)))) 1298 goto done; 1299 ipcperm_old2new(&old.shm_perm, &buf.shm_perm); 1300 CP(old, buf, shm_segsz); 1301 CP(old, buf, shm_lpid); 1302 CP(old, buf, shm_cpid); 1303 CP(old, buf, shm_nattch); 1304 CP(old, buf, shm_atime); 1305 CP(old, buf, shm_dtime); 1306 CP(old, buf, shm_ctime); 1307 } 1308 1309 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz); 1310 if (error) 1311 goto done; 1312 1313 /* Cases in which we need to copyout */ 1314 switch (uap->cmd) { 1315 case IPC_STAT: 1316 ipcperm_new2old(&buf.shm_perm, &old.shm_perm); 1317 if (buf.shm_segsz > INT_MAX) 1318 old.shm_segsz = INT_MAX; 1319 else 1320 CP(buf, old, shm_segsz); 1321 CP(buf, old, shm_lpid); 1322 CP(buf, old, shm_cpid); 1323 if (buf.shm_nattch > SHRT_MAX) 1324 old.shm_nattch = SHRT_MAX; 1325 else 1326 CP(buf, old, shm_nattch); 1327 CP(buf, old, shm_atime); 1328 CP(buf, old, shm_dtime); 1329 CP(buf, old, shm_ctime); 1330 old.shm_internal = NULL; 1331 error = copyout(&old, uap->buf, sizeof(old)); 1332 break; 1333 } 1334 1335 done: 1336 if (error) { 1337 /* Invalidate the return value */ 1338 td->td_retval[0] = -1; 1339 } 1340 return (error); 1341 } 1342 1343 #endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 || 1344 COMPAT_FREEBSD7 */ 1345 1346 static int 1347 sysvshm_modload(struct module *module, int cmd, void *arg) 1348 { 1349 int error = 0; 1350 1351 switch (cmd) { 1352 case MOD_LOAD: 1353 error = shminit(); 1354 if (error != 0) 1355 shmunload(); 1356 break; 1357 case MOD_UNLOAD: 1358 error = shmunload(); 1359 break; 1360 case MOD_SHUTDOWN: 1361 break; 1362 default: 1363 error = EINVAL; 1364 break; 1365 } 1366 return (error); 1367 } 1368 1369 static moduledata_t sysvshm_mod = { 1370 "sysvshm", 1371 &sysvshm_modload, 1372 NULL 1373 }; 1374 1375 DECLARE_MODULE(sysvshm, sysvshm_mod, SI_SUB_SYSV_SHM, SI_ORDER_FIRST); 1376 MODULE_VERSION(sysvshm, 1);
Cache object: 2f019c7ff8bd1ba780a762e40bfd2bef
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