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