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