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/9.0/sys/kern/sysv_shm.c 225617 2011-09-16 13:58:51Z kmacy $"); 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 for (i = 0; i < shminfo.shmseg; i++) 361 shmmap_s[i].shmid = -1; 362 p->p_vmspace->vm_shm = shmmap_s; 363 } 364 shmseg = shm_find_segment_by_shmid(shmid); 365 if (shmseg == NULL) { 366 error = EINVAL; 367 goto done2; 368 } 369 error = ipcperm(td, &shmseg->u.shm_perm, 370 (shmflg & SHM_RDONLY) ? IPC_R : IPC_R|IPC_W); 371 if (error) 372 goto done2; 373 #ifdef MAC 374 error = mac_sysvshm_check_shmat(td->td_ucred, shmseg, shmflg); 375 if (error != 0) 376 goto done2; 377 #endif 378 for (i = 0; i < shminfo.shmseg; i++) { 379 if (shmmap_s->shmid == -1) 380 break; 381 shmmap_s++; 382 } 383 if (i >= shminfo.shmseg) { 384 error = EMFILE; 385 goto done2; 386 } 387 size = round_page(shmseg->u.shm_segsz); 388 prot = VM_PROT_READ; 389 if ((shmflg & SHM_RDONLY) == 0) 390 prot |= VM_PROT_WRITE; 391 flags = MAP_ANON | MAP_SHARED; 392 if (shmaddr) { 393 flags |= MAP_FIXED; 394 if (shmflg & SHM_RND) { 395 attach_va = (vm_offset_t)shmaddr & ~(SHMLBA-1); 396 } else if (((vm_offset_t)shmaddr & (SHMLBA-1)) == 0) { 397 attach_va = (vm_offset_t)shmaddr; 398 } else { 399 error = EINVAL; 400 goto done2; 401 } 402 } else { 403 /* 404 * This is just a hint to vm_map_find() about where to 405 * put it. 406 */ 407 PROC_LOCK(p); 408 attach_va = round_page((vm_offset_t)p->p_vmspace->vm_daddr + 409 lim_max(p, RLIMIT_DATA)); 410 PROC_UNLOCK(p); 411 } 412 413 vm_object_reference(shmseg->object); 414 rv = vm_map_find(&p->p_vmspace->vm_map, shmseg->object, 415 0, &attach_va, size, (flags & MAP_FIXED) ? VMFS_NO_SPACE : 416 VMFS_ANY_SPACE, prot, prot, 0); 417 if (rv != KERN_SUCCESS) { 418 vm_object_deallocate(shmseg->object); 419 error = ENOMEM; 420 goto done2; 421 } 422 vm_map_inherit(&p->p_vmspace->vm_map, 423 attach_va, attach_va + size, VM_INHERIT_SHARE); 424 425 shmmap_s->va = attach_va; 426 shmmap_s->shmid = shmid; 427 shmseg->u.shm_lpid = p->p_pid; 428 shmseg->u.shm_atime = time_second; 429 shmseg->u.shm_nattch++; 430 td->td_retval[0] = attach_va; 431 done2: 432 mtx_unlock(&Giant); 433 return (error); 434 } 435 436 int 437 sys_shmat(td, uap) 438 struct thread *td; 439 struct shmat_args *uap; 440 { 441 return kern_shmat(td, uap->shmid, uap->shmaddr, uap->shmflg); 442 } 443 444 int 445 kern_shmctl(td, shmid, cmd, buf, bufsz) 446 struct thread *td; 447 int shmid; 448 int cmd; 449 void *buf; 450 size_t *bufsz; 451 { 452 int error = 0; 453 struct shmid_kernel *shmseg; 454 455 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 456 return (ENOSYS); 457 458 mtx_lock(&Giant); 459 switch (cmd) { 460 /* 461 * It is possible that kern_shmctl is being called from the Linux ABI 462 * layer, in which case, we will need to implement IPC_INFO. It should 463 * be noted that other shmctl calls will be funneled through here for 464 * Linix binaries as well. 465 * 466 * NB: The Linux ABI layer will convert this data to structure(s) more 467 * consistent with the Linux ABI. 468 */ 469 case IPC_INFO: 470 memcpy(buf, &shminfo, sizeof(shminfo)); 471 if (bufsz) 472 *bufsz = sizeof(shminfo); 473 td->td_retval[0] = shmalloced; 474 goto done2; 475 case SHM_INFO: { 476 struct shm_info shm_info; 477 shm_info.used_ids = shm_nused; 478 shm_info.shm_rss = 0; /*XXX where to get from ? */ 479 shm_info.shm_tot = 0; /*XXX where to get from ? */ 480 shm_info.shm_swp = 0; /*XXX where to get from ? */ 481 shm_info.swap_attempts = 0; /*XXX where to get from ? */ 482 shm_info.swap_successes = 0; /*XXX where to get from ? */ 483 memcpy(buf, &shm_info, sizeof(shm_info)); 484 if (bufsz) 485 *bufsz = sizeof(shm_info); 486 td->td_retval[0] = shmalloced; 487 goto done2; 488 } 489 } 490 if (cmd == SHM_STAT) 491 shmseg = shm_find_segment_by_shmidx(shmid); 492 else 493 shmseg = shm_find_segment_by_shmid(shmid); 494 if (shmseg == NULL) { 495 error = EINVAL; 496 goto done2; 497 } 498 #ifdef MAC 499 error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, cmd); 500 if (error != 0) 501 goto done2; 502 #endif 503 switch (cmd) { 504 case SHM_STAT: 505 case IPC_STAT: 506 error = ipcperm(td, &shmseg->u.shm_perm, IPC_R); 507 if (error) 508 goto done2; 509 memcpy(buf, &shmseg->u, sizeof(struct shmid_ds)); 510 if (bufsz) 511 *bufsz = sizeof(struct shmid_ds); 512 if (cmd == SHM_STAT) 513 td->td_retval[0] = IXSEQ_TO_IPCID(shmid, shmseg->u.shm_perm); 514 break; 515 case IPC_SET: { 516 struct shmid_ds *shmid; 517 518 shmid = (struct shmid_ds *)buf; 519 error = ipcperm(td, &shmseg->u.shm_perm, IPC_M); 520 if (error) 521 goto done2; 522 shmseg->u.shm_perm.uid = shmid->shm_perm.uid; 523 shmseg->u.shm_perm.gid = shmid->shm_perm.gid; 524 shmseg->u.shm_perm.mode = 525 (shmseg->u.shm_perm.mode & ~ACCESSPERMS) | 526 (shmid->shm_perm.mode & ACCESSPERMS); 527 shmseg->u.shm_ctime = time_second; 528 break; 529 } 530 case IPC_RMID: 531 error = ipcperm(td, &shmseg->u.shm_perm, IPC_M); 532 if (error) 533 goto done2; 534 shmseg->u.shm_perm.key = IPC_PRIVATE; 535 shmseg->u.shm_perm.mode |= SHMSEG_REMOVED; 536 if (shmseg->u.shm_nattch <= 0) { 537 shm_deallocate_segment(shmseg); 538 shm_last_free = IPCID_TO_IX(shmid); 539 } 540 break; 541 #if 0 542 case SHM_LOCK: 543 case SHM_UNLOCK: 544 #endif 545 default: 546 error = EINVAL; 547 break; 548 } 549 done2: 550 mtx_unlock(&Giant); 551 return (error); 552 } 553 554 #ifndef _SYS_SYSPROTO_H_ 555 struct shmctl_args { 556 int shmid; 557 int cmd; 558 struct shmid_ds *buf; 559 }; 560 #endif 561 int 562 sys_shmctl(td, uap) 563 struct thread *td; 564 struct shmctl_args *uap; 565 { 566 int error = 0; 567 struct shmid_ds buf; 568 size_t bufsz; 569 570 /* 571 * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support 572 * Linux binaries. If we see the call come through the FreeBSD ABI, 573 * return an error back to the user since we do not to support this. 574 */ 575 if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO || 576 uap->cmd == SHM_STAT) 577 return (EINVAL); 578 579 /* IPC_SET needs to copyin the buffer before calling kern_shmctl */ 580 if (uap->cmd == IPC_SET) { 581 if ((error = copyin(uap->buf, &buf, sizeof(struct shmid_ds)))) 582 goto done; 583 } 584 585 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz); 586 if (error) 587 goto done; 588 589 /* Cases in which we need to copyout */ 590 switch (uap->cmd) { 591 case IPC_STAT: 592 error = copyout(&buf, uap->buf, bufsz); 593 break; 594 } 595 596 done: 597 if (error) { 598 /* Invalidate the return value */ 599 td->td_retval[0] = -1; 600 } 601 return (error); 602 } 603 604 605 static int 606 shmget_existing(td, uap, mode, segnum) 607 struct thread *td; 608 struct shmget_args *uap; 609 int mode; 610 int segnum; 611 { 612 struct shmid_kernel *shmseg; 613 int error; 614 615 shmseg = &shmsegs[segnum]; 616 if (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) { 617 /* 618 * This segment is in the process of being allocated. Wait 619 * until it's done, and look the key up again (in case the 620 * allocation failed or it was freed). 621 */ 622 shmseg->u.shm_perm.mode |= SHMSEG_WANTED; 623 error = tsleep(shmseg, PLOCK | PCATCH, "shmget", 0); 624 if (error) 625 return (error); 626 return (EAGAIN); 627 } 628 if ((uap->shmflg & (IPC_CREAT | IPC_EXCL)) == (IPC_CREAT | IPC_EXCL)) 629 return (EEXIST); 630 #ifdef MAC 631 error = mac_sysvshm_check_shmget(td->td_ucred, shmseg, uap->shmflg); 632 if (error != 0) 633 return (error); 634 #endif 635 if (uap->size != 0 && uap->size > shmseg->u.shm_segsz) 636 return (EINVAL); 637 td->td_retval[0] = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm); 638 return (0); 639 } 640 641 static int 642 shmget_allocate_segment(td, uap, mode) 643 struct thread *td; 644 struct shmget_args *uap; 645 int mode; 646 { 647 int i, segnum, shmid; 648 size_t size; 649 struct ucred *cred = td->td_ucred; 650 struct shmid_kernel *shmseg; 651 vm_object_t shm_object; 652 653 GIANT_REQUIRED; 654 655 if (uap->size < shminfo.shmmin || uap->size > shminfo.shmmax) 656 return (EINVAL); 657 if (shm_nused >= shminfo.shmmni) /* Any shmids left? */ 658 return (ENOSPC); 659 size = round_page(uap->size); 660 if (shm_committed + btoc(size) > shminfo.shmall) 661 return (ENOMEM); 662 if (shm_last_free < 0) { 663 shmrealloc(); /* Maybe expand the shmsegs[] array. */ 664 for (i = 0; i < shmalloced; i++) 665 if (shmsegs[i].u.shm_perm.mode & SHMSEG_FREE) 666 break; 667 if (i == shmalloced) 668 return (ENOSPC); 669 segnum = i; 670 } else { 671 segnum = shm_last_free; 672 shm_last_free = -1; 673 } 674 shmseg = &shmsegs[segnum]; 675 #ifdef RACCT 676 PROC_LOCK(td->td_proc); 677 if (racct_add(td->td_proc, RACCT_NSHM, 1)) { 678 PROC_UNLOCK(td->td_proc); 679 return (ENOSPC); 680 } 681 if (racct_add(td->td_proc, RACCT_SHMSIZE, size)) { 682 racct_sub(td->td_proc, RACCT_NSHM, 1); 683 PROC_UNLOCK(td->td_proc); 684 return (ENOMEM); 685 } 686 PROC_UNLOCK(td->td_proc); 687 #endif 688 /* 689 * In case we sleep in malloc(), mark the segment present but deleted 690 * so that noone else tries to create the same key. 691 */ 692 shmseg->u.shm_perm.mode = SHMSEG_ALLOCATED | SHMSEG_REMOVED; 693 shmseg->u.shm_perm.key = uap->key; 694 shmseg->u.shm_perm.seq = (shmseg->u.shm_perm.seq + 1) & 0x7fff; 695 shmid = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm); 696 697 /* 698 * We make sure that we have allocated a pager before we need 699 * to. 700 */ 701 shm_object = vm_pager_allocate(shm_use_phys ? OBJT_PHYS : OBJT_SWAP, 702 0, size, VM_PROT_DEFAULT, 0, cred); 703 if (shm_object == NULL) { 704 #ifdef RACCT 705 PROC_LOCK(td->td_proc); 706 racct_sub(td->td_proc, RACCT_NSHM, 1); 707 racct_sub(td->td_proc, RACCT_SHMSIZE, size); 708 PROC_UNLOCK(td->td_proc); 709 #endif 710 return (ENOMEM); 711 } 712 VM_OBJECT_LOCK(shm_object); 713 vm_object_clear_flag(shm_object, OBJ_ONEMAPPING); 714 vm_object_set_flag(shm_object, OBJ_NOSPLIT); 715 VM_OBJECT_UNLOCK(shm_object); 716 717 shmseg->object = shm_object; 718 shmseg->u.shm_perm.cuid = shmseg->u.shm_perm.uid = cred->cr_uid; 719 shmseg->u.shm_perm.cgid = shmseg->u.shm_perm.gid = cred->cr_gid; 720 shmseg->u.shm_perm.mode = (shmseg->u.shm_perm.mode & SHMSEG_WANTED) | 721 (mode & ACCESSPERMS) | SHMSEG_ALLOCATED; 722 shmseg->cred = crhold(cred); 723 shmseg->u.shm_segsz = uap->size; 724 shmseg->u.shm_cpid = td->td_proc->p_pid; 725 shmseg->u.shm_lpid = shmseg->u.shm_nattch = 0; 726 shmseg->u.shm_atime = shmseg->u.shm_dtime = 0; 727 #ifdef MAC 728 mac_sysvshm_create(cred, shmseg); 729 #endif 730 shmseg->u.shm_ctime = time_second; 731 shm_committed += btoc(size); 732 shm_nused++; 733 if (shmseg->u.shm_perm.mode & SHMSEG_WANTED) { 734 /* 735 * Somebody else wanted this key while we were asleep. Wake 736 * them up now. 737 */ 738 shmseg->u.shm_perm.mode &= ~SHMSEG_WANTED; 739 wakeup(shmseg); 740 } 741 td->td_retval[0] = shmid; 742 return (0); 743 } 744 745 #ifndef _SYS_SYSPROTO_H_ 746 struct shmget_args { 747 key_t key; 748 size_t size; 749 int shmflg; 750 }; 751 #endif 752 int 753 sys_shmget(td, uap) 754 struct thread *td; 755 struct shmget_args *uap; 756 { 757 int segnum, mode; 758 int error; 759 760 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 761 return (ENOSYS); 762 mtx_lock(&Giant); 763 mode = uap->shmflg & ACCESSPERMS; 764 if (uap->key != IPC_PRIVATE) { 765 again: 766 segnum = shm_find_segment_by_key(uap->key); 767 if (segnum >= 0) { 768 error = shmget_existing(td, uap, mode, segnum); 769 if (error == EAGAIN) 770 goto again; 771 goto done2; 772 } 773 if ((uap->shmflg & IPC_CREAT) == 0) { 774 error = ENOENT; 775 goto done2; 776 } 777 } 778 error = shmget_allocate_segment(td, uap, mode); 779 done2: 780 mtx_unlock(&Giant); 781 return (error); 782 } 783 784 static void 785 shmfork_myhook(p1, p2) 786 struct proc *p1, *p2; 787 { 788 struct shmmap_state *shmmap_s; 789 size_t size; 790 int i; 791 792 mtx_lock(&Giant); 793 size = shminfo.shmseg * sizeof(struct shmmap_state); 794 shmmap_s = malloc(size, M_SHM, M_WAITOK); 795 bcopy(p1->p_vmspace->vm_shm, shmmap_s, size); 796 p2->p_vmspace->vm_shm = shmmap_s; 797 for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) 798 if (shmmap_s->shmid != -1) 799 shmsegs[IPCID_TO_IX(shmmap_s->shmid)].u.shm_nattch++; 800 mtx_unlock(&Giant); 801 } 802 803 static void 804 shmexit_myhook(struct vmspace *vm) 805 { 806 struct shmmap_state *base, *shm; 807 int i; 808 809 if ((base = vm->vm_shm) != NULL) { 810 vm->vm_shm = NULL; 811 mtx_lock(&Giant); 812 for (i = 0, shm = base; i < shminfo.shmseg; i++, shm++) { 813 if (shm->shmid != -1) 814 shm_delete_mapping(vm, shm); 815 } 816 mtx_unlock(&Giant); 817 free(base, M_SHM); 818 } 819 } 820 821 static void 822 shmrealloc(void) 823 { 824 int i; 825 struct shmid_kernel *newsegs; 826 827 if (shmalloced >= shminfo.shmmni) 828 return; 829 830 newsegs = malloc(shminfo.shmmni * sizeof(*newsegs), M_SHM, M_WAITOK); 831 if (newsegs == NULL) 832 return; 833 for (i = 0; i < shmalloced; i++) 834 bcopy(&shmsegs[i], &newsegs[i], sizeof(newsegs[0])); 835 for (; i < shminfo.shmmni; i++) { 836 shmsegs[i].u.shm_perm.mode = SHMSEG_FREE; 837 shmsegs[i].u.shm_perm.seq = 0; 838 #ifdef MAC 839 mac_sysvshm_init(&shmsegs[i]); 840 #endif 841 } 842 free(shmsegs, M_SHM); 843 shmsegs = newsegs; 844 shmalloced = shminfo.shmmni; 845 } 846 847 static struct syscall_helper_data shm_syscalls[] = { 848 SYSCALL_INIT_HELPER(shmat), 849 SYSCALL_INIT_HELPER(shmctl), 850 SYSCALL_INIT_HELPER(shmdt), 851 SYSCALL_INIT_HELPER(shmget), 852 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 853 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 854 SYSCALL_INIT_HELPER_COMPAT(freebsd7_shmctl), 855 #endif 856 #if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43)) 857 SYSCALL_INIT_HELPER(shmsys), 858 #endif 859 SYSCALL_INIT_LAST 860 }; 861 862 #ifdef COMPAT_FREEBSD32 863 #include <compat/freebsd32/freebsd32.h> 864 #include <compat/freebsd32/freebsd32_ipc.h> 865 #include <compat/freebsd32/freebsd32_proto.h> 866 #include <compat/freebsd32/freebsd32_signal.h> 867 #include <compat/freebsd32/freebsd32_syscall.h> 868 #include <compat/freebsd32/freebsd32_util.h> 869 870 static struct syscall_helper_data shm32_syscalls[] = { 871 SYSCALL32_INIT_HELPER_COMPAT(shmat), 872 SYSCALL32_INIT_HELPER_COMPAT(shmdt), 873 SYSCALL32_INIT_HELPER_COMPAT(shmget), 874 SYSCALL32_INIT_HELPER(freebsd32_shmsys), 875 SYSCALL32_INIT_HELPER(freebsd32_shmctl), 876 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 877 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 878 SYSCALL32_INIT_HELPER(freebsd7_freebsd32_shmctl), 879 #endif 880 SYSCALL_INIT_LAST 881 }; 882 #endif 883 884 static int 885 shminit() 886 { 887 int i, error; 888 889 #ifndef BURN_BRIDGES 890 if (TUNABLE_ULONG_FETCH("kern.ipc.shmmaxpgs", &shminfo.shmall) != 0) 891 printf("kern.ipc.shmmaxpgs is now called kern.ipc.shmall!\n"); 892 #endif 893 TUNABLE_ULONG_FETCH("kern.ipc.shmall", &shminfo.shmall); 894 895 /* Initialize shmmax dealing with possible overflow. */ 896 for (i = PAGE_SIZE; i > 0; i--) { 897 shminfo.shmmax = shminfo.shmall * i; 898 if (shminfo.shmmax >= shminfo.shmall) 899 break; 900 } 901 902 TUNABLE_ULONG_FETCH("kern.ipc.shmmin", &shminfo.shmmin); 903 TUNABLE_ULONG_FETCH("kern.ipc.shmmni", &shminfo.shmmni); 904 TUNABLE_ULONG_FETCH("kern.ipc.shmseg", &shminfo.shmseg); 905 TUNABLE_INT_FETCH("kern.ipc.shm_use_phys", &shm_use_phys); 906 907 shmalloced = shminfo.shmmni; 908 shmsegs = malloc(shmalloced * sizeof(shmsegs[0]), M_SHM, M_WAITOK); 909 for (i = 0; i < shmalloced; i++) { 910 shmsegs[i].u.shm_perm.mode = SHMSEG_FREE; 911 shmsegs[i].u.shm_perm.seq = 0; 912 #ifdef MAC 913 mac_sysvshm_init(&shmsegs[i]); 914 #endif 915 } 916 shm_last_free = 0; 917 shm_nused = 0; 918 shm_committed = 0; 919 shmexit_hook = &shmexit_myhook; 920 shmfork_hook = &shmfork_myhook; 921 922 error = syscall_helper_register(shm_syscalls); 923 if (error != 0) 924 return (error); 925 #ifdef COMPAT_FREEBSD32 926 error = syscall32_helper_register(shm32_syscalls); 927 if (error != 0) 928 return (error); 929 #endif 930 return (0); 931 } 932 933 static int 934 shmunload() 935 { 936 int i; 937 938 if (shm_nused > 0) 939 return (EBUSY); 940 941 #ifdef COMPAT_FREEBSD32 942 syscall32_helper_unregister(shm32_syscalls); 943 #endif 944 syscall_helper_unregister(shm_syscalls); 945 946 for (i = 0; i < shmalloced; i++) { 947 #ifdef MAC 948 mac_sysvshm_destroy(&shmsegs[i]); 949 #endif 950 /* 951 * Objects might be still mapped into the processes 952 * address spaces. Actual free would happen on the 953 * last mapping destruction. 954 */ 955 if (shmsegs[i].u.shm_perm.mode != SHMSEG_FREE) 956 vm_object_deallocate(shmsegs[i].object); 957 } 958 free(shmsegs, M_SHM); 959 shmexit_hook = NULL; 960 shmfork_hook = NULL; 961 return (0); 962 } 963 964 static int 965 sysctl_shmsegs(SYSCTL_HANDLER_ARGS) 966 { 967 968 return (SYSCTL_OUT(req, shmsegs, shmalloced * sizeof(shmsegs[0]))); 969 } 970 971 #if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43)) 972 struct oshmid_ds { 973 struct ipc_perm_old shm_perm; /* operation perms */ 974 int shm_segsz; /* size of segment (bytes) */ 975 u_short shm_cpid; /* pid, creator */ 976 u_short shm_lpid; /* pid, last operation */ 977 short shm_nattch; /* no. of current attaches */ 978 time_t shm_atime; /* last attach time */ 979 time_t shm_dtime; /* last detach time */ 980 time_t shm_ctime; /* last change time */ 981 void *shm_handle; /* internal handle for shm segment */ 982 }; 983 984 struct oshmctl_args { 985 int shmid; 986 int cmd; 987 struct oshmid_ds *ubuf; 988 }; 989 990 static int 991 oshmctl(struct thread *td, struct oshmctl_args *uap) 992 { 993 #ifdef COMPAT_43 994 int error = 0; 995 struct shmid_kernel *shmseg; 996 struct oshmid_ds outbuf; 997 998 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 999 return (ENOSYS); 1000 mtx_lock(&Giant); 1001 shmseg = shm_find_segment_by_shmid(uap->shmid); 1002 if (shmseg == NULL) { 1003 error = EINVAL; 1004 goto done2; 1005 } 1006 switch (uap->cmd) { 1007 case IPC_STAT: 1008 error = ipcperm(td, &shmseg->u.shm_perm, IPC_R); 1009 if (error) 1010 goto done2; 1011 #ifdef MAC 1012 error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, uap->cmd); 1013 if (error != 0) 1014 goto done2; 1015 #endif 1016 ipcperm_new2old(&shmseg->u.shm_perm, &outbuf.shm_perm); 1017 outbuf.shm_segsz = shmseg->u.shm_segsz; 1018 outbuf.shm_cpid = shmseg->u.shm_cpid; 1019 outbuf.shm_lpid = shmseg->u.shm_lpid; 1020 outbuf.shm_nattch = shmseg->u.shm_nattch; 1021 outbuf.shm_atime = shmseg->u.shm_atime; 1022 outbuf.shm_dtime = shmseg->u.shm_dtime; 1023 outbuf.shm_ctime = shmseg->u.shm_ctime; 1024 outbuf.shm_handle = shmseg->object; 1025 error = copyout(&outbuf, uap->ubuf, sizeof(outbuf)); 1026 if (error) 1027 goto done2; 1028 break; 1029 default: 1030 error = freebsd7_shmctl(td, (struct freebsd7_shmctl_args *)uap); 1031 break; 1032 } 1033 done2: 1034 mtx_unlock(&Giant); 1035 return (error); 1036 #else 1037 return (EINVAL); 1038 #endif 1039 } 1040 1041 /* XXX casting to (sy_call_t *) is bogus, as usual. */ 1042 static sy_call_t *shmcalls[] = { 1043 (sy_call_t *)sys_shmat, (sy_call_t *)oshmctl, 1044 (sy_call_t *)sys_shmdt, (sy_call_t *)sys_shmget, 1045 (sy_call_t *)freebsd7_shmctl 1046 }; 1047 1048 int 1049 sys_shmsys(td, uap) 1050 struct thread *td; 1051 /* XXX actually varargs. */ 1052 struct shmsys_args /* { 1053 int which; 1054 int a2; 1055 int a3; 1056 int a4; 1057 } */ *uap; 1058 { 1059 int error; 1060 1061 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 1062 return (ENOSYS); 1063 if (uap->which < 0 || 1064 uap->which >= sizeof(shmcalls)/sizeof(shmcalls[0])) 1065 return (EINVAL); 1066 mtx_lock(&Giant); 1067 error = (*shmcalls[uap->which])(td, &uap->a2); 1068 mtx_unlock(&Giant); 1069 return (error); 1070 } 1071 1072 #endif /* i386 && (COMPAT_FREEBSD4 || COMPAT_43) */ 1073 1074 #ifdef COMPAT_FREEBSD32 1075 1076 int 1077 freebsd32_shmsys(struct thread *td, struct freebsd32_shmsys_args *uap) 1078 { 1079 1080 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1081 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1082 switch (uap->which) { 1083 case 0: { /* shmat */ 1084 struct shmat_args ap; 1085 1086 ap.shmid = uap->a2; 1087 ap.shmaddr = PTRIN(uap->a3); 1088 ap.shmflg = uap->a4; 1089 return (sysent[SYS_shmat].sy_call(td, &ap)); 1090 } 1091 case 2: { /* shmdt */ 1092 struct shmdt_args ap; 1093 1094 ap.shmaddr = PTRIN(uap->a2); 1095 return (sysent[SYS_shmdt].sy_call(td, &ap)); 1096 } 1097 case 3: { /* shmget */ 1098 struct shmget_args ap; 1099 1100 ap.key = uap->a2; 1101 ap.size = uap->a3; 1102 ap.shmflg = uap->a4; 1103 return (sysent[SYS_shmget].sy_call(td, &ap)); 1104 } 1105 case 4: { /* shmctl */ 1106 struct freebsd7_freebsd32_shmctl_args ap; 1107 1108 ap.shmid = uap->a2; 1109 ap.cmd = uap->a3; 1110 ap.buf = PTRIN(uap->a4); 1111 return (freebsd7_freebsd32_shmctl(td, &ap)); 1112 } 1113 case 1: /* oshmctl */ 1114 default: 1115 return (EINVAL); 1116 } 1117 #else 1118 return (nosys(td, NULL)); 1119 #endif 1120 } 1121 1122 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1123 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1124 int 1125 freebsd7_freebsd32_shmctl(struct thread *td, 1126 struct freebsd7_freebsd32_shmctl_args *uap) 1127 { 1128 int error = 0; 1129 union { 1130 struct shmid_ds shmid_ds; 1131 struct shm_info shm_info; 1132 struct shminfo shminfo; 1133 } u; 1134 union { 1135 struct shmid_ds32_old shmid_ds32; 1136 struct shm_info32 shm_info32; 1137 struct shminfo32 shminfo32; 1138 } u32; 1139 size_t sz; 1140 1141 if (uap->cmd == IPC_SET) { 1142 if ((error = copyin(uap->buf, &u32.shmid_ds32, 1143 sizeof(u32.shmid_ds32)))) 1144 goto done; 1145 freebsd32_ipcperm_old_in(&u32.shmid_ds32.shm_perm, 1146 &u.shmid_ds.shm_perm); 1147 CP(u32.shmid_ds32, u.shmid_ds, shm_segsz); 1148 CP(u32.shmid_ds32, u.shmid_ds, shm_lpid); 1149 CP(u32.shmid_ds32, u.shmid_ds, shm_cpid); 1150 CP(u32.shmid_ds32, u.shmid_ds, shm_nattch); 1151 CP(u32.shmid_ds32, u.shmid_ds, shm_atime); 1152 CP(u32.shmid_ds32, u.shmid_ds, shm_dtime); 1153 CP(u32.shmid_ds32, u.shmid_ds, shm_ctime); 1154 } 1155 1156 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz); 1157 if (error) 1158 goto done; 1159 1160 /* Cases in which we need to copyout */ 1161 switch (uap->cmd) { 1162 case IPC_INFO: 1163 CP(u.shminfo, u32.shminfo32, shmmax); 1164 CP(u.shminfo, u32.shminfo32, shmmin); 1165 CP(u.shminfo, u32.shminfo32, shmmni); 1166 CP(u.shminfo, u32.shminfo32, shmseg); 1167 CP(u.shminfo, u32.shminfo32, shmall); 1168 error = copyout(&u32.shminfo32, uap->buf, 1169 sizeof(u32.shminfo32)); 1170 break; 1171 case SHM_INFO: 1172 CP(u.shm_info, u32.shm_info32, used_ids); 1173 CP(u.shm_info, u32.shm_info32, shm_rss); 1174 CP(u.shm_info, u32.shm_info32, shm_tot); 1175 CP(u.shm_info, u32.shm_info32, shm_swp); 1176 CP(u.shm_info, u32.shm_info32, swap_attempts); 1177 CP(u.shm_info, u32.shm_info32, swap_successes); 1178 error = copyout(&u32.shm_info32, uap->buf, 1179 sizeof(u32.shm_info32)); 1180 break; 1181 case SHM_STAT: 1182 case IPC_STAT: 1183 freebsd32_ipcperm_old_out(&u.shmid_ds.shm_perm, 1184 &u32.shmid_ds32.shm_perm); 1185 if (u.shmid_ds.shm_segsz > INT32_MAX) 1186 u32.shmid_ds32.shm_segsz = INT32_MAX; 1187 else 1188 CP(u.shmid_ds, u32.shmid_ds32, shm_segsz); 1189 CP(u.shmid_ds, u32.shmid_ds32, shm_lpid); 1190 CP(u.shmid_ds, u32.shmid_ds32, shm_cpid); 1191 CP(u.shmid_ds, u32.shmid_ds32, shm_nattch); 1192 CP(u.shmid_ds, u32.shmid_ds32, shm_atime); 1193 CP(u.shmid_ds, u32.shmid_ds32, shm_dtime); 1194 CP(u.shmid_ds, u32.shmid_ds32, shm_ctime); 1195 u32.shmid_ds32.shm_internal = 0; 1196 error = copyout(&u32.shmid_ds32, uap->buf, 1197 sizeof(u32.shmid_ds32)); 1198 break; 1199 } 1200 1201 done: 1202 if (error) { 1203 /* Invalidate the return value */ 1204 td->td_retval[0] = -1; 1205 } 1206 return (error); 1207 } 1208 #endif 1209 1210 int 1211 freebsd32_shmctl(struct thread *td, struct freebsd32_shmctl_args *uap) 1212 { 1213 int error = 0; 1214 union { 1215 struct shmid_ds shmid_ds; 1216 struct shm_info shm_info; 1217 struct shminfo shminfo; 1218 } u; 1219 union { 1220 struct shmid_ds32 shmid_ds32; 1221 struct shm_info32 shm_info32; 1222 struct shminfo32 shminfo32; 1223 } u32; 1224 size_t sz; 1225 1226 if (uap->cmd == IPC_SET) { 1227 if ((error = copyin(uap->buf, &u32.shmid_ds32, 1228 sizeof(u32.shmid_ds32)))) 1229 goto done; 1230 freebsd32_ipcperm_in(&u32.shmid_ds32.shm_perm, 1231 &u.shmid_ds.shm_perm); 1232 CP(u32.shmid_ds32, u.shmid_ds, shm_segsz); 1233 CP(u32.shmid_ds32, u.shmid_ds, shm_lpid); 1234 CP(u32.shmid_ds32, u.shmid_ds, shm_cpid); 1235 CP(u32.shmid_ds32, u.shmid_ds, shm_nattch); 1236 CP(u32.shmid_ds32, u.shmid_ds, shm_atime); 1237 CP(u32.shmid_ds32, u.shmid_ds, shm_dtime); 1238 CP(u32.shmid_ds32, u.shmid_ds, shm_ctime); 1239 } 1240 1241 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz); 1242 if (error) 1243 goto done; 1244 1245 /* Cases in which we need to copyout */ 1246 switch (uap->cmd) { 1247 case IPC_INFO: 1248 CP(u.shminfo, u32.shminfo32, shmmax); 1249 CP(u.shminfo, u32.shminfo32, shmmin); 1250 CP(u.shminfo, u32.shminfo32, shmmni); 1251 CP(u.shminfo, u32.shminfo32, shmseg); 1252 CP(u.shminfo, u32.shminfo32, shmall); 1253 error = copyout(&u32.shminfo32, uap->buf, 1254 sizeof(u32.shminfo32)); 1255 break; 1256 case SHM_INFO: 1257 CP(u.shm_info, u32.shm_info32, used_ids); 1258 CP(u.shm_info, u32.shm_info32, shm_rss); 1259 CP(u.shm_info, u32.shm_info32, shm_tot); 1260 CP(u.shm_info, u32.shm_info32, shm_swp); 1261 CP(u.shm_info, u32.shm_info32, swap_attempts); 1262 CP(u.shm_info, u32.shm_info32, swap_successes); 1263 error = copyout(&u32.shm_info32, uap->buf, 1264 sizeof(u32.shm_info32)); 1265 break; 1266 case SHM_STAT: 1267 case IPC_STAT: 1268 freebsd32_ipcperm_out(&u.shmid_ds.shm_perm, 1269 &u32.shmid_ds32.shm_perm); 1270 if (u.shmid_ds.shm_segsz > INT32_MAX) 1271 u32.shmid_ds32.shm_segsz = INT32_MAX; 1272 else 1273 CP(u.shmid_ds, u32.shmid_ds32, shm_segsz); 1274 CP(u.shmid_ds, u32.shmid_ds32, shm_lpid); 1275 CP(u.shmid_ds, u32.shmid_ds32, shm_cpid); 1276 CP(u.shmid_ds, u32.shmid_ds32, shm_nattch); 1277 CP(u.shmid_ds, u32.shmid_ds32, shm_atime); 1278 CP(u.shmid_ds, u32.shmid_ds32, shm_dtime); 1279 CP(u.shmid_ds, u32.shmid_ds32, shm_ctime); 1280 error = copyout(&u32.shmid_ds32, uap->buf, 1281 sizeof(u32.shmid_ds32)); 1282 break; 1283 } 1284 1285 done: 1286 if (error) { 1287 /* Invalidate the return value */ 1288 td->td_retval[0] = -1; 1289 } 1290 return (error); 1291 } 1292 #endif 1293 1294 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1295 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1296 1297 #ifndef CP 1298 #define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0) 1299 #endif 1300 1301 #ifndef _SYS_SYSPROTO_H_ 1302 struct freebsd7_shmctl_args { 1303 int shmid; 1304 int cmd; 1305 struct shmid_ds_old *buf; 1306 }; 1307 #endif 1308 int 1309 freebsd7_shmctl(td, uap) 1310 struct thread *td; 1311 struct freebsd7_shmctl_args *uap; 1312 { 1313 int error = 0; 1314 struct shmid_ds_old old; 1315 struct shmid_ds buf; 1316 size_t bufsz; 1317 1318 /* 1319 * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support 1320 * Linux binaries. If we see the call come through the FreeBSD ABI, 1321 * return an error back to the user since we do not to support this. 1322 */ 1323 if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO || 1324 uap->cmd == SHM_STAT) 1325 return (EINVAL); 1326 1327 /* IPC_SET needs to copyin the buffer before calling kern_shmctl */ 1328 if (uap->cmd == IPC_SET) { 1329 if ((error = copyin(uap->buf, &old, sizeof(old)))) 1330 goto done; 1331 ipcperm_old2new(&old.shm_perm, &buf.shm_perm); 1332 CP(old, buf, shm_segsz); 1333 CP(old, buf, shm_lpid); 1334 CP(old, buf, shm_cpid); 1335 CP(old, buf, shm_nattch); 1336 CP(old, buf, shm_atime); 1337 CP(old, buf, shm_dtime); 1338 CP(old, buf, shm_ctime); 1339 } 1340 1341 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz); 1342 if (error) 1343 goto done; 1344 1345 /* Cases in which we need to copyout */ 1346 switch (uap->cmd) { 1347 case IPC_STAT: 1348 ipcperm_new2old(&buf.shm_perm, &old.shm_perm); 1349 if (buf.shm_segsz > INT_MAX) 1350 old.shm_segsz = INT_MAX; 1351 else 1352 CP(buf, old, shm_segsz); 1353 CP(buf, old, shm_lpid); 1354 CP(buf, old, shm_cpid); 1355 if (buf.shm_nattch > SHRT_MAX) 1356 old.shm_nattch = SHRT_MAX; 1357 else 1358 CP(buf, old, shm_nattch); 1359 CP(buf, old, shm_atime); 1360 CP(buf, old, shm_dtime); 1361 CP(buf, old, shm_ctime); 1362 old.shm_internal = NULL; 1363 error = copyout(&old, uap->buf, sizeof(old)); 1364 break; 1365 } 1366 1367 done: 1368 if (error) { 1369 /* Invalidate the return value */ 1370 td->td_retval[0] = -1; 1371 } 1372 return (error); 1373 } 1374 1375 #endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 || 1376 COMPAT_FREEBSD7 */ 1377 1378 static int 1379 sysvshm_modload(struct module *module, int cmd, void *arg) 1380 { 1381 int error = 0; 1382 1383 switch (cmd) { 1384 case MOD_LOAD: 1385 error = shminit(); 1386 if (error != 0) 1387 shmunload(); 1388 break; 1389 case MOD_UNLOAD: 1390 error = shmunload(); 1391 break; 1392 case MOD_SHUTDOWN: 1393 break; 1394 default: 1395 error = EINVAL; 1396 break; 1397 } 1398 return (error); 1399 } 1400 1401 static moduledata_t sysvshm_mod = { 1402 "sysvshm", 1403 &sysvshm_modload, 1404 NULL 1405 }; 1406 1407 DECLARE_MODULE(sysvshm, sysvshm_mod, SI_SUB_SYSV_SHM, SI_ORDER_FIRST); 1408 MODULE_VERSION(sysvshm, 1);
Cache object: 953a59fd09a0f6432ed7093ff3a5af24
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