sysv_shm.c revision 219028
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: head/sys/kern/sysv_shm.c 219028 2011-02-25 10:11:01Z netchild $"); 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/resourcevar.h> 81#include <sys/stat.h> 82#include <sys/syscall.h> 83#include <sys/syscallsubr.h> 84#include <sys/sysent.h> 85#include <sys/sysproto.h> 86#include <sys/jail.h> 87 88#include <security/mac/mac_framework.h> 89 90#include <vm/vm.h> 91#include <vm/vm_param.h> 92#include <vm/pmap.h> 93#include <vm/vm_object.h> 94#include <vm/vm_map.h> 95#include <vm/vm_page.h> 96#include <vm/vm_pager.h> 97 98FEATURE(sysv_shm, "System V shared memory segments support"); 99 100static MALLOC_DEFINE(M_SHM, "shm", "SVID compatible shared memory segments"); 101 102static int shmget_allocate_segment(struct thread *td, 103 struct shmget_args *uap, int mode); 104static int shmget_existing(struct thread *td, struct shmget_args *uap, 105 int mode, int segnum); 106 107#define SHMSEG_FREE 0x0200 108#define SHMSEG_REMOVED 0x0400 109#define SHMSEG_ALLOCATED 0x0800 110#define SHMSEG_WANTED 0x1000 111 112static int shm_last_free, shm_nused, shmalloced; 113vm_size_t shm_committed; 114static struct shmid_kernel *shmsegs; 115 116struct shmmap_state { 117 vm_offset_t va; 118 int shmid; 119}; 120 121static void shm_deallocate_segment(struct shmid_kernel *); 122static int shm_find_segment_by_key(key_t); 123static struct shmid_kernel *shm_find_segment_by_shmid(int); 124static struct shmid_kernel *shm_find_segment_by_shmidx(int); 125static int shm_delete_mapping(struct vmspace *vm, struct shmmap_state *); 126static void shmrealloc(void); 127static int shminit(void); 128static int sysvshm_modload(struct module *, int, void *); 129static int shmunload(void); 130static void shmexit_myhook(struct vmspace *vm); 131static void shmfork_myhook(struct proc *p1, struct proc *p2); 132static int sysctl_shmsegs(SYSCTL_HANDLER_ARGS); 133 134/* 135 * Tuneable values. 136 */ 137#ifndef SHMMAXPGS 138#define SHMMAXPGS 131072 /* Note: sysv shared memory is swap backed. */ 139#endif 140#ifndef SHMMAX 141#define SHMMAX (SHMMAXPGS*PAGE_SIZE) 142#endif 143#ifndef SHMMIN 144#define SHMMIN 1 145#endif 146#ifndef SHMMNI 147#define SHMMNI 192 148#endif 149#ifndef SHMSEG 150#define SHMSEG 128 151#endif 152#ifndef SHMALL 153#define SHMALL (SHMMAXPGS) 154#endif 155 156struct shminfo shminfo = { 157 SHMMAX, 158 SHMMIN, 159 SHMMNI, 160 SHMSEG, 161 SHMALL 162}; 163 164static int shm_use_phys; 165static int shm_allow_removed; 166 167SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmax, CTLFLAG_RW, &shminfo.shmmax, 0, 168 "Maximum shared memory segment size"); 169SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmin, CTLFLAG_RW, &shminfo.shmmin, 0, 170 "Minimum shared memory segment size"); 171SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmni, CTLFLAG_RDTUN, &shminfo.shmmni, 0, 172 "Number of shared memory identifiers"); 173SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmseg, CTLFLAG_RDTUN, &shminfo.shmseg, 0, 174 "Number of segments per process"); 175SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmall, CTLFLAG_RW, &shminfo.shmall, 0, 176 "Maximum number of pages available for shared memory"); 177SYSCTL_INT(_kern_ipc, OID_AUTO, shm_use_phys, CTLFLAG_RW, 178 &shm_use_phys, 0, "Enable/Disable locking of shared memory pages in core"); 179SYSCTL_INT(_kern_ipc, OID_AUTO, shm_allow_removed, CTLFLAG_RW, 180 &shm_allow_removed, 0, 181 "Enable/Disable attachment to attached segments marked for removal"); 182SYSCTL_PROC(_kern_ipc, OID_AUTO, shmsegs, CTLTYPE_OPAQUE | CTLFLAG_RD, 183 NULL, 0, sysctl_shmsegs, "", 184 "Current number of shared memory segments allocated"); 185 186static int 187shm_find_segment_by_key(key) 188 key_t key; 189{ 190 int i; 191 192 for (i = 0; i < shmalloced; i++) 193 if ((shmsegs[i].u.shm_perm.mode & SHMSEG_ALLOCATED) && 194 shmsegs[i].u.shm_perm.key == key) 195 return (i); 196 return (-1); 197} 198 199static struct shmid_kernel * 200shm_find_segment_by_shmid(int shmid) 201{ 202 int segnum; 203 struct shmid_kernel *shmseg; 204 205 segnum = IPCID_TO_IX(shmid); 206 if (segnum < 0 || segnum >= shmalloced) 207 return (NULL); 208 shmseg = &shmsegs[segnum]; 209 if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 || 210 (!shm_allow_removed && 211 (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) != 0) || 212 shmseg->u.shm_perm.seq != IPCID_TO_SEQ(shmid)) 213 return (NULL); 214 return (shmseg); 215} 216 217static struct shmid_kernel * 218shm_find_segment_by_shmidx(int segnum) 219{ 220 struct shmid_kernel *shmseg; 221 222 if (segnum < 0 || segnum >= shmalloced) 223 return (NULL); 224 shmseg = &shmsegs[segnum]; 225 if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 || 226 (!shm_allow_removed && 227 (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) != 0)) 228 return (NULL); 229 return (shmseg); 230} 231 232static void 233shm_deallocate_segment(shmseg) 234 struct shmid_kernel *shmseg; 235{ 236 vm_size_t size; 237 238 GIANT_REQUIRED; 239 240 vm_object_deallocate(shmseg->object); 241 shmseg->object = NULL; 242 size = round_page(shmseg->u.shm_segsz); 243 shm_committed -= btoc(size); 244 shm_nused--; 245 shmseg->u.shm_perm.mode = SHMSEG_FREE; 246#ifdef MAC 247 mac_sysvshm_cleanup(shmseg); 248#endif 249} 250 251static int 252shm_delete_mapping(struct vmspace *vm, struct shmmap_state *shmmap_s) 253{ 254 struct shmid_kernel *shmseg; 255 int segnum, result; 256 vm_size_t size; 257 258 GIANT_REQUIRED; 259 260 segnum = IPCID_TO_IX(shmmap_s->shmid); 261 shmseg = &shmsegs[segnum]; 262 size = round_page(shmseg->u.shm_segsz); 263 result = vm_map_remove(&vm->vm_map, shmmap_s->va, shmmap_s->va + size); 264 if (result != KERN_SUCCESS) 265 return (EINVAL); 266 shmmap_s->shmid = -1; 267 shmseg->u.shm_dtime = time_second; 268 if ((--shmseg->u.shm_nattch <= 0) && 269 (shmseg->u.shm_perm.mode & SHMSEG_REMOVED)) { 270 shm_deallocate_segment(shmseg); 271 shm_last_free = segnum; 272 } 273 return (0); 274} 275 276#ifndef _SYS_SYSPROTO_H_ 277struct shmdt_args { 278 const void *shmaddr; 279}; 280#endif 281int 282shmdt(td, uap) 283 struct thread *td; 284 struct shmdt_args *uap; 285{ 286 struct proc *p = td->td_proc; 287 struct shmmap_state *shmmap_s; 288#ifdef MAC 289 struct shmid_kernel *shmsegptr; 290#endif 291 int i; 292 int error = 0; 293 294 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 295 return (ENOSYS); 296 mtx_lock(&Giant); 297 shmmap_s = p->p_vmspace->vm_shm; 298 if (shmmap_s == NULL) { 299 error = EINVAL; 300 goto done2; 301 } 302 for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) { 303 if (shmmap_s->shmid != -1 && 304 shmmap_s->va == (vm_offset_t)uap->shmaddr) { 305 break; 306 } 307 } 308 if (i == shminfo.shmseg) { 309 error = EINVAL; 310 goto done2; 311 } 312#ifdef MAC 313 shmsegptr = &shmsegs[IPCID_TO_IX(shmmap_s->shmid)]; 314 error = mac_sysvshm_check_shmdt(td->td_ucred, shmsegptr); 315 if (error != 0) 316 goto done2; 317#endif 318 error = shm_delete_mapping(p->p_vmspace, shmmap_s); 319done2: 320 mtx_unlock(&Giant); 321 return (error); 322} 323 324#ifndef _SYS_SYSPROTO_H_ 325struct shmat_args { 326 int shmid; 327 const void *shmaddr; 328 int shmflg; 329}; 330#endif 331int 332kern_shmat(td, shmid, shmaddr, shmflg) 333 struct thread *td; 334 int shmid; 335 const void *shmaddr; 336 int shmflg; 337{ 338 struct proc *p = td->td_proc; 339 int i, flags; 340 struct shmid_kernel *shmseg; 341 struct shmmap_state *shmmap_s = NULL; 342 vm_offset_t attach_va; 343 vm_prot_t prot; 344 vm_size_t size; 345 int rv; 346 int error = 0; 347 348 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 349 return (ENOSYS); 350 mtx_lock(&Giant); 351 shmmap_s = p->p_vmspace->vm_shm; 352 if (shmmap_s == NULL) { 353 shmmap_s = malloc(shminfo.shmseg * sizeof(struct shmmap_state), 354 M_SHM, M_WAITOK); 355 for (i = 0; i < shminfo.shmseg; i++) 356 shmmap_s[i].shmid = -1; 357 p->p_vmspace->vm_shm = shmmap_s; 358 } 359 shmseg = shm_find_segment_by_shmid(shmid); 360 if (shmseg == NULL) { 361 error = EINVAL; 362 goto done2; 363 } 364 error = ipcperm(td, &shmseg->u.shm_perm, 365 (shmflg & SHM_RDONLY) ? IPC_R : IPC_R|IPC_W); 366 if (error) 367 goto done2; 368#ifdef MAC 369 error = mac_sysvshm_check_shmat(td->td_ucred, shmseg, shmflg); 370 if (error != 0) 371 goto done2; 372#endif 373 for (i = 0; i < shminfo.shmseg; i++) { 374 if (shmmap_s->shmid == -1) 375 break; 376 shmmap_s++; 377 } 378 if (i >= shminfo.shmseg) { 379 error = EMFILE; 380 goto done2; 381 } 382 size = round_page(shmseg->u.shm_segsz); 383 prot = VM_PROT_READ; 384 if ((shmflg & SHM_RDONLY) == 0) 385 prot |= VM_PROT_WRITE; 386 flags = MAP_ANON | MAP_SHARED; 387 if (shmaddr) { 388 flags |= MAP_FIXED; 389 if (shmflg & SHM_RND) { 390 attach_va = (vm_offset_t)shmaddr & ~(SHMLBA-1); 391 } else if (((vm_offset_t)shmaddr & (SHMLBA-1)) == 0) { 392 attach_va = (vm_offset_t)shmaddr; 393 } else { 394 error = EINVAL; 395 goto done2; 396 } 397 } else { 398 /* 399 * This is just a hint to vm_map_find() about where to 400 * put it. 401 */ 402 PROC_LOCK(p); 403 attach_va = round_page((vm_offset_t)p->p_vmspace->vm_daddr + 404 lim_max(p, RLIMIT_DATA)); 405 PROC_UNLOCK(p); 406 } 407 408 vm_object_reference(shmseg->object); 409 rv = vm_map_find(&p->p_vmspace->vm_map, shmseg->object, 410 0, &attach_va, size, (flags & MAP_FIXED) ? VMFS_NO_SPACE : 411 VMFS_ANY_SPACE, prot, prot, 0); 412 if (rv != KERN_SUCCESS) { 413 vm_object_deallocate(shmseg->object); 414 error = ENOMEM; 415 goto done2; 416 } 417 vm_map_inherit(&p->p_vmspace->vm_map, 418 attach_va, attach_va + size, VM_INHERIT_SHARE); 419 420 shmmap_s->va = attach_va; 421 shmmap_s->shmid = shmid; 422 shmseg->u.shm_lpid = p->p_pid; 423 shmseg->u.shm_atime = time_second; 424 shmseg->u.shm_nattch++; 425 td->td_retval[0] = attach_va; 426done2: 427 mtx_unlock(&Giant); 428 return (error); 429} 430 431int 432shmat(td, uap) 433 struct thread *td; 434 struct shmat_args *uap; 435{ 436 return kern_shmat(td, uap->shmid, uap->shmaddr, uap->shmflg); 437} 438 439int 440kern_shmctl(td, shmid, cmd, buf, bufsz) 441 struct thread *td; 442 int shmid; 443 int cmd; 444 void *buf; 445 size_t *bufsz; 446{ 447 int error = 0; 448 struct shmid_kernel *shmseg; 449 450 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 451 return (ENOSYS); 452 453 mtx_lock(&Giant); 454 switch (cmd) { 455 /* 456 * It is possible that kern_shmctl is being called from the Linux ABI 457 * layer, in which case, we will need to implement IPC_INFO. It should 458 * be noted that other shmctl calls will be funneled through here for 459 * Linix binaries as well. 460 * 461 * NB: The Linux ABI layer will convert this data to structure(s) more 462 * consistent with the Linux ABI. 463 */ 464 case IPC_INFO: 465 memcpy(buf, &shminfo, sizeof(shminfo)); 466 if (bufsz) 467 *bufsz = sizeof(shminfo); 468 td->td_retval[0] = shmalloced; 469 goto done2; 470 case SHM_INFO: { 471 struct shm_info shm_info; 472 shm_info.used_ids = shm_nused; 473 shm_info.shm_rss = 0; /*XXX where to get from ? */ 474 shm_info.shm_tot = 0; /*XXX where to get from ? */ 475 shm_info.shm_swp = 0; /*XXX where to get from ? */ 476 shm_info.swap_attempts = 0; /*XXX where to get from ? */ 477 shm_info.swap_successes = 0; /*XXX where to get from ? */ 478 memcpy(buf, &shm_info, sizeof(shm_info)); 479 if (bufsz) 480 *bufsz = sizeof(shm_info); 481 td->td_retval[0] = shmalloced; 482 goto done2; 483 } 484 } 485 if (cmd == SHM_STAT) 486 shmseg = shm_find_segment_by_shmidx(shmid); 487 else 488 shmseg = shm_find_segment_by_shmid(shmid); 489 if (shmseg == NULL) { 490 error = EINVAL; 491 goto done2; 492 } 493#ifdef MAC 494 error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, cmd); 495 if (error != 0) 496 goto done2; 497#endif 498 switch (cmd) { 499 case SHM_STAT: 500 case IPC_STAT: 501 error = ipcperm(td, &shmseg->u.shm_perm, IPC_R); 502 if (error) 503 goto done2; 504 memcpy(buf, &shmseg->u, sizeof(struct shmid_ds)); 505 if (bufsz) 506 *bufsz = sizeof(struct shmid_ds); 507 if (cmd == SHM_STAT) 508 td->td_retval[0] = IXSEQ_TO_IPCID(shmid, shmseg->u.shm_perm); 509 break; 510 case IPC_SET: { 511 struct shmid_ds *shmid; 512 513 shmid = (struct shmid_ds *)buf; 514 error = ipcperm(td, &shmseg->u.shm_perm, IPC_M); 515 if (error) 516 goto done2; 517 shmseg->u.shm_perm.uid = shmid->shm_perm.uid; 518 shmseg->u.shm_perm.gid = shmid->shm_perm.gid; 519 shmseg->u.shm_perm.mode = 520 (shmseg->u.shm_perm.mode & ~ACCESSPERMS) | 521 (shmid->shm_perm.mode & ACCESSPERMS); 522 shmseg->u.shm_ctime = time_second; 523 break; 524 } 525 case IPC_RMID: 526 error = ipcperm(td, &shmseg->u.shm_perm, IPC_M); 527 if (error) 528 goto done2; 529 shmseg->u.shm_perm.key = IPC_PRIVATE; 530 shmseg->u.shm_perm.mode |= SHMSEG_REMOVED; 531 if (shmseg->u.shm_nattch <= 0) { 532 shm_deallocate_segment(shmseg); 533 shm_last_free = IPCID_TO_IX(shmid); 534 } 535 break; 536#if 0 537 case SHM_LOCK: 538 case SHM_UNLOCK: 539#endif 540 default: 541 error = EINVAL; 542 break; 543 } 544done2: 545 mtx_unlock(&Giant); 546 return (error); 547} 548 549#ifndef _SYS_SYSPROTO_H_ 550struct shmctl_args { 551 int shmid; 552 int cmd; 553 struct shmid_ds *buf; 554}; 555#endif 556int 557shmctl(td, uap) 558 struct thread *td; 559 struct shmctl_args *uap; 560{ 561 int error = 0; 562 struct shmid_ds buf; 563 size_t bufsz; 564 565 /* 566 * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support 567 * Linux binaries. If we see the call come through the FreeBSD ABI, 568 * return an error back to the user since we do not to support this. 569 */ 570 if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO || 571 uap->cmd == SHM_STAT) 572 return (EINVAL); 573 574 /* IPC_SET needs to copyin the buffer before calling kern_shmctl */ 575 if (uap->cmd == IPC_SET) { 576 if ((error = copyin(uap->buf, &buf, sizeof(struct shmid_ds)))) 577 goto done; 578 } 579 580 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz); 581 if (error) 582 goto done; 583 584 /* Cases in which we need to copyout */ 585 switch (uap->cmd) { 586 case IPC_STAT: 587 error = copyout(&buf, uap->buf, bufsz); 588 break; 589 } 590 591done: 592 if (error) { 593 /* Invalidate the return value */ 594 td->td_retval[0] = -1; 595 } 596 return (error); 597} 598 599 600static int 601shmget_existing(td, uap, mode, segnum) 602 struct thread *td; 603 struct shmget_args *uap; 604 int mode; 605 int segnum; 606{ 607 struct shmid_kernel *shmseg; 608 int error; 609 610 shmseg = &shmsegs[segnum]; 611 if (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) { 612 /* 613 * This segment is in the process of being allocated. Wait 614 * until it's done, and look the key up again (in case the 615 * allocation failed or it was freed). 616 */ 617 shmseg->u.shm_perm.mode |= SHMSEG_WANTED; 618 error = tsleep(shmseg, PLOCK | PCATCH, "shmget", 0); 619 if (error) 620 return (error); 621 return (EAGAIN); 622 } 623 if ((uap->shmflg & (IPC_CREAT | IPC_EXCL)) == (IPC_CREAT | IPC_EXCL)) 624 return (EEXIST); 625#ifdef MAC 626 error = mac_sysvshm_check_shmget(td->td_ucred, shmseg, uap->shmflg); 627 if (error != 0) 628 return (error); 629#endif 630 if (uap->size != 0 && uap->size > shmseg->u.shm_segsz) 631 return (EINVAL); 632 td->td_retval[0] = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm); 633 return (0); 634} 635 636static int 637shmget_allocate_segment(td, uap, mode) 638 struct thread *td; 639 struct shmget_args *uap; 640 int mode; 641{ 642 int i, segnum, shmid; 643 size_t size; 644 struct ucred *cred = td->td_ucred; 645 struct shmid_kernel *shmseg; 646 vm_object_t shm_object; 647 648 GIANT_REQUIRED; 649 650 if (uap->size < shminfo.shmmin || uap->size > shminfo.shmmax) 651 return (EINVAL); 652 if (shm_nused >= shminfo.shmmni) /* Any shmids left? */ 653 return (ENOSPC); 654 size = round_page(uap->size); 655 if (shm_committed + btoc(size) > shminfo.shmall) 656 return (ENOMEM); 657 if (shm_last_free < 0) { 658 shmrealloc(); /* Maybe expand the shmsegs[] array. */ 659 for (i = 0; i < shmalloced; i++) 660 if (shmsegs[i].u.shm_perm.mode & SHMSEG_FREE) 661 break; 662 if (i == shmalloced) 663 return (ENOSPC); 664 segnum = i; 665 } else { 666 segnum = shm_last_free; 667 shm_last_free = -1; 668 } 669 shmseg = &shmsegs[segnum]; 670 /* 671 * In case we sleep in malloc(), mark the segment present but deleted 672 * so that noone else tries to create the same key. 673 */ 674 shmseg->u.shm_perm.mode = SHMSEG_ALLOCATED | SHMSEG_REMOVED; 675 shmseg->u.shm_perm.key = uap->key; 676 shmseg->u.shm_perm.seq = (shmseg->u.shm_perm.seq + 1) & 0x7fff; 677 shmid = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm); 678 679 /* 680 * We make sure that we have allocated a pager before we need 681 * to. 682 */ 683 shm_object = vm_pager_allocate(shm_use_phys ? OBJT_PHYS : OBJT_SWAP, 684 0, size, VM_PROT_DEFAULT, 0, cred); 685 if (shm_object == NULL) 686 return (ENOMEM); 687 VM_OBJECT_LOCK(shm_object); 688 vm_object_clear_flag(shm_object, OBJ_ONEMAPPING); 689 vm_object_set_flag(shm_object, OBJ_NOSPLIT); 690 VM_OBJECT_UNLOCK(shm_object); 691 692 shmseg->object = shm_object; 693 shmseg->u.shm_perm.cuid = shmseg->u.shm_perm.uid = cred->cr_uid; 694 shmseg->u.shm_perm.cgid = shmseg->u.shm_perm.gid = cred->cr_gid; 695 shmseg->u.shm_perm.mode = (shmseg->u.shm_perm.mode & SHMSEG_WANTED) | 696 (mode & ACCESSPERMS) | SHMSEG_ALLOCATED; 697 shmseg->u.shm_segsz = uap->size; 698 shmseg->u.shm_cpid = td->td_proc->p_pid; 699 shmseg->u.shm_lpid = shmseg->u.shm_nattch = 0; 700 shmseg->u.shm_atime = shmseg->u.shm_dtime = 0; 701#ifdef MAC 702 mac_sysvshm_create(cred, shmseg); 703#endif 704 shmseg->u.shm_ctime = time_second; 705 shm_committed += btoc(size); 706 shm_nused++; 707 if (shmseg->u.shm_perm.mode & SHMSEG_WANTED) { 708 /* 709 * Somebody else wanted this key while we were asleep. Wake 710 * them up now. 711 */ 712 shmseg->u.shm_perm.mode &= ~SHMSEG_WANTED; 713 wakeup(shmseg); 714 } 715 td->td_retval[0] = shmid; 716 return (0); 717} 718 719#ifndef _SYS_SYSPROTO_H_ 720struct shmget_args { 721 key_t key; 722 size_t size; 723 int shmflg; 724}; 725#endif 726int 727shmget(td, uap) 728 struct thread *td; 729 struct shmget_args *uap; 730{ 731 int segnum, mode; 732 int error; 733 734 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 735 return (ENOSYS); 736 mtx_lock(&Giant); 737 mode = uap->shmflg & ACCESSPERMS; 738 if (uap->key != IPC_PRIVATE) { 739 again: 740 segnum = shm_find_segment_by_key(uap->key); 741 if (segnum >= 0) { 742 error = shmget_existing(td, uap, mode, segnum); 743 if (error == EAGAIN) 744 goto again; 745 goto done2; 746 } 747 if ((uap->shmflg & IPC_CREAT) == 0) { 748 error = ENOENT; 749 goto done2; 750 } 751 } 752 error = shmget_allocate_segment(td, uap, mode); 753done2: 754 mtx_unlock(&Giant); 755 return (error); 756} 757 758static void 759shmfork_myhook(p1, p2) 760 struct proc *p1, *p2; 761{ 762 struct shmmap_state *shmmap_s; 763 size_t size; 764 int i; 765 766 mtx_lock(&Giant); 767 size = shminfo.shmseg * sizeof(struct shmmap_state); 768 shmmap_s = malloc(size, M_SHM, M_WAITOK); 769 bcopy(p1->p_vmspace->vm_shm, shmmap_s, size); 770 p2->p_vmspace->vm_shm = shmmap_s; 771 for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) 772 if (shmmap_s->shmid != -1) 773 shmsegs[IPCID_TO_IX(shmmap_s->shmid)].u.shm_nattch++; 774 mtx_unlock(&Giant); 775} 776 777static void 778shmexit_myhook(struct vmspace *vm) 779{ 780 struct shmmap_state *base, *shm; 781 int i; 782 783 if ((base = vm->vm_shm) != NULL) { 784 vm->vm_shm = NULL; 785 mtx_lock(&Giant); 786 for (i = 0, shm = base; i < shminfo.shmseg; i++, shm++) { 787 if (shm->shmid != -1) 788 shm_delete_mapping(vm, shm); 789 } 790 mtx_unlock(&Giant); 791 free(base, M_SHM); 792 } 793} 794 795static void 796shmrealloc(void) 797{ 798 int i; 799 struct shmid_kernel *newsegs; 800 801 if (shmalloced >= shminfo.shmmni) 802 return; 803 804 newsegs = malloc(shminfo.shmmni * sizeof(*newsegs), M_SHM, M_WAITOK); 805 if (newsegs == NULL) 806 return; 807 for (i = 0; i < shmalloced; i++) 808 bcopy(&shmsegs[i], &newsegs[i], sizeof(newsegs[0])); 809 for (; i < shminfo.shmmni; i++) { 810 shmsegs[i].u.shm_perm.mode = SHMSEG_FREE; 811 shmsegs[i].u.shm_perm.seq = 0; 812#ifdef MAC 813 mac_sysvshm_init(&shmsegs[i]); 814#endif 815 } 816 free(shmsegs, M_SHM); 817 shmsegs = newsegs; 818 shmalloced = shminfo.shmmni; 819} 820 821static struct syscall_helper_data shm_syscalls[] = { 822 SYSCALL_INIT_HELPER(shmat), 823 SYSCALL_INIT_HELPER(shmctl), 824 SYSCALL_INIT_HELPER(shmdt), 825 SYSCALL_INIT_HELPER(shmget), 826#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 827 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 828 SYSCALL_INIT_HELPER(freebsd7_shmctl), 829#endif 830#if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43)) 831 SYSCALL_INIT_HELPER(shmsys), 832#endif 833 SYSCALL_INIT_LAST 834}; 835 836#ifdef COMPAT_FREEBSD32 837#include <compat/freebsd32/freebsd32.h> 838#include <compat/freebsd32/freebsd32_ipc.h> 839#include <compat/freebsd32/freebsd32_proto.h> 840#include <compat/freebsd32/freebsd32_signal.h> 841#include <compat/freebsd32/freebsd32_syscall.h> 842#include <compat/freebsd32/freebsd32_util.h> 843 844static struct syscall_helper_data shm32_syscalls[] = { 845 SYSCALL32_INIT_HELPER(shmat), 846 SYSCALL32_INIT_HELPER(shmdt), 847 SYSCALL32_INIT_HELPER(shmget), 848 SYSCALL32_INIT_HELPER(freebsd32_shmsys), 849 SYSCALL32_INIT_HELPER(freebsd32_shmctl), 850#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 851 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 852 SYSCALL32_INIT_HELPER(freebsd7_freebsd32_shmctl), 853#endif 854 SYSCALL_INIT_LAST 855}; 856#endif 857 858static int 859shminit() 860{ 861 int i, error; 862 863#ifndef BURN_BRIDGES 864 if (TUNABLE_ULONG_FETCH("kern.ipc.shmmaxpgs", &shminfo.shmall) != 0) 865 printf("kern.ipc.shmmaxpgs is now called kern.ipc.shmall!\n"); 866#endif 867 TUNABLE_ULONG_FETCH("kern.ipc.shmall", &shminfo.shmall); 868 869 /* Initialize shmmax dealing with possible overflow. */ 870 for (i = PAGE_SIZE; i > 0; i--) { 871 shminfo.shmmax = shminfo.shmall * i; 872 if (shminfo.shmmax >= shminfo.shmall) 873 break; 874 } 875 876 TUNABLE_ULONG_FETCH("kern.ipc.shmmin", &shminfo.shmmin); 877 TUNABLE_ULONG_FETCH("kern.ipc.shmmni", &shminfo.shmmni); 878 TUNABLE_ULONG_FETCH("kern.ipc.shmseg", &shminfo.shmseg); 879 TUNABLE_INT_FETCH("kern.ipc.shm_use_phys", &shm_use_phys); 880 881 shmalloced = shminfo.shmmni; 882 shmsegs = malloc(shmalloced * sizeof(shmsegs[0]), M_SHM, M_WAITOK); 883 for (i = 0; i < shmalloced; i++) { 884 shmsegs[i].u.shm_perm.mode = SHMSEG_FREE; 885 shmsegs[i].u.shm_perm.seq = 0; 886#ifdef MAC 887 mac_sysvshm_init(&shmsegs[i]); 888#endif 889 } 890 shm_last_free = 0; 891 shm_nused = 0; 892 shm_committed = 0; 893 shmexit_hook = &shmexit_myhook; 894 shmfork_hook = &shmfork_myhook; 895 896 error = syscall_helper_register(shm_syscalls); 897 if (error != 0) 898 return (error); 899#ifdef COMPAT_FREEBSD32 900 error = syscall32_helper_register(shm32_syscalls); 901 if (error != 0) 902 return (error); 903#endif 904 return (0); 905} 906 907static int 908shmunload() 909{ 910 int i; 911 912 if (shm_nused > 0) 913 return (EBUSY); 914 915#ifdef COMPAT_FREEBSD32 916 syscall32_helper_unregister(shm32_syscalls); 917#endif 918 syscall_helper_unregister(shm_syscalls); 919 920 for (i = 0; i < shmalloced; i++) { 921#ifdef MAC 922 mac_sysvshm_destroy(&shmsegs[i]); 923#endif 924 /* 925 * Objects might be still mapped into the processes 926 * address spaces. Actual free would happen on the 927 * last mapping destruction. 928 */ 929 if (shmsegs[i].u.shm_perm.mode != SHMSEG_FREE) 930 vm_object_deallocate(shmsegs[i].object); 931 } 932 free(shmsegs, M_SHM); 933 shmexit_hook = NULL; 934 shmfork_hook = NULL; 935 return (0); 936} 937 938static int 939sysctl_shmsegs(SYSCTL_HANDLER_ARGS) 940{ 941 942 return (SYSCTL_OUT(req, shmsegs, shmalloced * sizeof(shmsegs[0]))); 943} 944 945#if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43)) 946struct oshmid_ds { 947 struct ipc_perm_old shm_perm; /* operation perms */ 948 int shm_segsz; /* size of segment (bytes) */ 949 u_short shm_cpid; /* pid, creator */ 950 u_short shm_lpid; /* pid, last operation */ 951 short shm_nattch; /* no. of current attaches */ 952 time_t shm_atime; /* last attach time */ 953 time_t shm_dtime; /* last detach time */ 954 time_t shm_ctime; /* last change time */ 955 void *shm_handle; /* internal handle for shm segment */ 956}; 957 958struct oshmctl_args { 959 int shmid; 960 int cmd; 961 struct oshmid_ds *ubuf; 962}; 963 964static int 965oshmctl(struct thread *td, struct oshmctl_args *uap) 966{ 967#ifdef COMPAT_43 968 int error = 0; 969 struct shmid_kernel *shmseg; 970 struct oshmid_ds outbuf; 971 972 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 973 return (ENOSYS); 974 mtx_lock(&Giant); 975 shmseg = shm_find_segment_by_shmid(uap->shmid); 976 if (shmseg == NULL) { 977 error = EINVAL; 978 goto done2; 979 } 980 switch (uap->cmd) { 981 case IPC_STAT: 982 error = ipcperm(td, &shmseg->u.shm_perm, IPC_R); 983 if (error) 984 goto done2; 985#ifdef MAC 986 error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, uap->cmd); 987 if (error != 0) 988 goto done2; 989#endif 990 ipcperm_new2old(&shmseg->u.shm_perm, &outbuf.shm_perm); 991 outbuf.shm_segsz = shmseg->u.shm_segsz; 992 outbuf.shm_cpid = shmseg->u.shm_cpid; 993 outbuf.shm_lpid = shmseg->u.shm_lpid; 994 outbuf.shm_nattch = shmseg->u.shm_nattch; 995 outbuf.shm_atime = shmseg->u.shm_atime; 996 outbuf.shm_dtime = shmseg->u.shm_dtime; 997 outbuf.shm_ctime = shmseg->u.shm_ctime; 998 outbuf.shm_handle = shmseg->object; 999 error = copyout(&outbuf, uap->ubuf, sizeof(outbuf)); 1000 if (error) 1001 goto done2; 1002 break; 1003 default: 1004 error = freebsd7_shmctl(td, (struct freebsd7_shmctl_args *)uap); 1005 break; 1006 } 1007done2: 1008 mtx_unlock(&Giant); 1009 return (error); 1010#else 1011 return (EINVAL); 1012#endif 1013} 1014 1015/* XXX casting to (sy_call_t *) is bogus, as usual. */ 1016static sy_call_t *shmcalls[] = { 1017 (sy_call_t *)shmat, (sy_call_t *)oshmctl, 1018 (sy_call_t *)shmdt, (sy_call_t *)shmget, 1019 (sy_call_t *)freebsd7_shmctl 1020}; 1021 1022int 1023shmsys(td, uap) 1024 struct thread *td; 1025 /* XXX actually varargs. */ 1026 struct shmsys_args /* { 1027 int which; 1028 int a2; 1029 int a3; 1030 int a4; 1031 } */ *uap; 1032{ 1033 int error; 1034 1035 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 1036 return (ENOSYS); 1037 if (uap->which < 0 || 1038 uap->which >= sizeof(shmcalls)/sizeof(shmcalls[0])) 1039 return (EINVAL); 1040 mtx_lock(&Giant); 1041 error = (*shmcalls[uap->which])(td, &uap->a2); 1042 mtx_unlock(&Giant); 1043 return (error); 1044} 1045 1046#endif /* i386 && (COMPAT_FREEBSD4 || COMPAT_43) */ 1047 1048#ifdef COMPAT_FREEBSD32 1049 1050int 1051freebsd32_shmsys(struct thread *td, struct freebsd32_shmsys_args *uap) 1052{ 1053 1054#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1055 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1056 switch (uap->which) { 1057 case 0: { /* shmat */ 1058 struct shmat_args ap; 1059 1060 ap.shmid = uap->a2; 1061 ap.shmaddr = PTRIN(uap->a3); 1062 ap.shmflg = uap->a4; 1063 return (sysent[SYS_shmat].sy_call(td, &ap)); 1064 } 1065 case 2: { /* shmdt */ 1066 struct shmdt_args ap; 1067 1068 ap.shmaddr = PTRIN(uap->a2); 1069 return (sysent[SYS_shmdt].sy_call(td, &ap)); 1070 } 1071 case 3: { /* shmget */ 1072 struct shmget_args ap; 1073 1074 ap.key = uap->a2; 1075 ap.size = uap->a3; 1076 ap.shmflg = uap->a4; 1077 return (sysent[SYS_shmget].sy_call(td, &ap)); 1078 } 1079 case 4: { /* shmctl */ 1080 struct freebsd7_freebsd32_shmctl_args ap; 1081 1082 ap.shmid = uap->a2; 1083 ap.cmd = uap->a3; 1084 ap.buf = PTRIN(uap->a4); 1085 return (freebsd7_freebsd32_shmctl(td, &ap)); 1086 } 1087 case 1: /* oshmctl */ 1088 default: 1089 return (EINVAL); 1090 } 1091#else 1092 return (nosys(td, NULL)); 1093#endif 1094} 1095 1096#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1097 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1098int 1099freebsd7_freebsd32_shmctl(struct thread *td, 1100 struct freebsd7_freebsd32_shmctl_args *uap) 1101{ 1102 int error = 0; 1103 union { 1104 struct shmid_ds shmid_ds; 1105 struct shm_info shm_info; 1106 struct shminfo shminfo; 1107 } u; 1108 union { 1109 struct shmid_ds32_old shmid_ds32; 1110 struct shm_info32 shm_info32; 1111 struct shminfo32 shminfo32; 1112 } u32; 1113 size_t sz; 1114 1115 if (uap->cmd == IPC_SET) { 1116 if ((error = copyin(uap->buf, &u32.shmid_ds32, 1117 sizeof(u32.shmid_ds32)))) 1118 goto done; 1119 freebsd32_ipcperm_old_in(&u32.shmid_ds32.shm_perm, 1120 &u.shmid_ds.shm_perm); 1121 CP(u32.shmid_ds32, u.shmid_ds, shm_segsz); 1122 CP(u32.shmid_ds32, u.shmid_ds, shm_lpid); 1123 CP(u32.shmid_ds32, u.shmid_ds, shm_cpid); 1124 CP(u32.shmid_ds32, u.shmid_ds, shm_nattch); 1125 CP(u32.shmid_ds32, u.shmid_ds, shm_atime); 1126 CP(u32.shmid_ds32, u.shmid_ds, shm_dtime); 1127 CP(u32.shmid_ds32, u.shmid_ds, shm_ctime); 1128 } 1129 1130 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz); 1131 if (error) 1132 goto done; 1133 1134 /* Cases in which we need to copyout */ 1135 switch (uap->cmd) { 1136 case IPC_INFO: 1137 CP(u.shminfo, u32.shminfo32, shmmax); 1138 CP(u.shminfo, u32.shminfo32, shmmin); 1139 CP(u.shminfo, u32.shminfo32, shmmni); 1140 CP(u.shminfo, u32.shminfo32, shmseg); 1141 CP(u.shminfo, u32.shminfo32, shmall); 1142 error = copyout(&u32.shminfo32, uap->buf, 1143 sizeof(u32.shminfo32)); 1144 break; 1145 case SHM_INFO: 1146 CP(u.shm_info, u32.shm_info32, used_ids); 1147 CP(u.shm_info, u32.shm_info32, shm_rss); 1148 CP(u.shm_info, u32.shm_info32, shm_tot); 1149 CP(u.shm_info, u32.shm_info32, shm_swp); 1150 CP(u.shm_info, u32.shm_info32, swap_attempts); 1151 CP(u.shm_info, u32.shm_info32, swap_successes); 1152 error = copyout(&u32.shm_info32, uap->buf, 1153 sizeof(u32.shm_info32)); 1154 break; 1155 case SHM_STAT: 1156 case IPC_STAT: 1157 freebsd32_ipcperm_old_out(&u.shmid_ds.shm_perm, 1158 &u32.shmid_ds32.shm_perm); 1159 if (u.shmid_ds.shm_segsz > INT32_MAX) 1160 u32.shmid_ds32.shm_segsz = INT32_MAX; 1161 else 1162 CP(u.shmid_ds, u32.shmid_ds32, shm_segsz); 1163 CP(u.shmid_ds, u32.shmid_ds32, shm_lpid); 1164 CP(u.shmid_ds, u32.shmid_ds32, shm_cpid); 1165 CP(u.shmid_ds, u32.shmid_ds32, shm_nattch); 1166 CP(u.shmid_ds, u32.shmid_ds32, shm_atime); 1167 CP(u.shmid_ds, u32.shmid_ds32, shm_dtime); 1168 CP(u.shmid_ds, u32.shmid_ds32, shm_ctime); 1169 u32.shmid_ds32.shm_internal = 0; 1170 error = copyout(&u32.shmid_ds32, uap->buf, 1171 sizeof(u32.shmid_ds32)); 1172 break; 1173 } 1174 1175done: 1176 if (error) { 1177 /* Invalidate the return value */ 1178 td->td_retval[0] = -1; 1179 } 1180 return (error); 1181} 1182#endif 1183 1184int 1185freebsd32_shmctl(struct thread *td, struct freebsd32_shmctl_args *uap) 1186{ 1187 int error = 0; 1188 union { 1189 struct shmid_ds shmid_ds; 1190 struct shm_info shm_info; 1191 struct shminfo shminfo; 1192 } u; 1193 union { 1194 struct shmid_ds32 shmid_ds32; 1195 struct shm_info32 shm_info32; 1196 struct shminfo32 shminfo32; 1197 } u32; 1198 size_t sz; 1199 1200 if (uap->cmd == IPC_SET) { 1201 if ((error = copyin(uap->buf, &u32.shmid_ds32, 1202 sizeof(u32.shmid_ds32)))) 1203 goto done; 1204 freebsd32_ipcperm_in(&u32.shmid_ds32.shm_perm, 1205 &u.shmid_ds.shm_perm); 1206 CP(u32.shmid_ds32, u.shmid_ds, shm_segsz); 1207 CP(u32.shmid_ds32, u.shmid_ds, shm_lpid); 1208 CP(u32.shmid_ds32, u.shmid_ds, shm_cpid); 1209 CP(u32.shmid_ds32, u.shmid_ds, shm_nattch); 1210 CP(u32.shmid_ds32, u.shmid_ds, shm_atime); 1211 CP(u32.shmid_ds32, u.shmid_ds, shm_dtime); 1212 CP(u32.shmid_ds32, u.shmid_ds, shm_ctime); 1213 } 1214 1215 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz); 1216 if (error) 1217 goto done; 1218 1219 /* Cases in which we need to copyout */ 1220 switch (uap->cmd) { 1221 case IPC_INFO: 1222 CP(u.shminfo, u32.shminfo32, shmmax); 1223 CP(u.shminfo, u32.shminfo32, shmmin); 1224 CP(u.shminfo, u32.shminfo32, shmmni); 1225 CP(u.shminfo, u32.shminfo32, shmseg); 1226 CP(u.shminfo, u32.shminfo32, shmall); 1227 error = copyout(&u32.shminfo32, uap->buf, 1228 sizeof(u32.shminfo32)); 1229 break; 1230 case SHM_INFO: 1231 CP(u.shm_info, u32.shm_info32, used_ids); 1232 CP(u.shm_info, u32.shm_info32, shm_rss); 1233 CP(u.shm_info, u32.shm_info32, shm_tot); 1234 CP(u.shm_info, u32.shm_info32, shm_swp); 1235 CP(u.shm_info, u32.shm_info32, swap_attempts); 1236 CP(u.shm_info, u32.shm_info32, swap_successes); 1237 error = copyout(&u32.shm_info32, uap->buf, 1238 sizeof(u32.shm_info32)); 1239 break; 1240 case SHM_STAT: 1241 case IPC_STAT: 1242 freebsd32_ipcperm_out(&u.shmid_ds.shm_perm, 1243 &u32.shmid_ds32.shm_perm); 1244 if (u.shmid_ds.shm_segsz > INT32_MAX) 1245 u32.shmid_ds32.shm_segsz = INT32_MAX; 1246 else 1247 CP(u.shmid_ds, u32.shmid_ds32, shm_segsz); 1248 CP(u.shmid_ds, u32.shmid_ds32, shm_lpid); 1249 CP(u.shmid_ds, u32.shmid_ds32, shm_cpid); 1250 CP(u.shmid_ds, u32.shmid_ds32, shm_nattch); 1251 CP(u.shmid_ds, u32.shmid_ds32, shm_atime); 1252 CP(u.shmid_ds, u32.shmid_ds32, shm_dtime); 1253 CP(u.shmid_ds, u32.shmid_ds32, shm_ctime); 1254 error = copyout(&u32.shmid_ds32, uap->buf, 1255 sizeof(u32.shmid_ds32)); 1256 break; 1257 } 1258 1259done: 1260 if (error) { 1261 /* Invalidate the return value */ 1262 td->td_retval[0] = -1; 1263 } 1264 return (error); 1265} 1266#endif 1267 1268#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1269 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1270 1271#ifndef CP 1272#define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0) 1273#endif 1274 1275#ifndef _SYS_SYSPROTO_H_ 1276struct freebsd7_shmctl_args { 1277 int shmid; 1278 int cmd; 1279 struct shmid_ds_old *buf; 1280}; 1281#endif 1282int 1283freebsd7_shmctl(td, uap) 1284 struct thread *td; 1285 struct freebsd7_shmctl_args *uap; 1286{ 1287 int error = 0; 1288 struct shmid_ds_old old; 1289 struct shmid_ds buf; 1290 size_t bufsz; 1291 1292 /* 1293 * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support 1294 * Linux binaries. If we see the call come through the FreeBSD ABI, 1295 * return an error back to the user since we do not to support this. 1296 */ 1297 if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO || 1298 uap->cmd == SHM_STAT) 1299 return (EINVAL); 1300 1301 /* IPC_SET needs to copyin the buffer before calling kern_shmctl */ 1302 if (uap->cmd == IPC_SET) { 1303 if ((error = copyin(uap->buf, &old, sizeof(old)))) 1304 goto done; 1305 ipcperm_old2new(&old.shm_perm, &buf.shm_perm); 1306 CP(old, buf, shm_segsz); 1307 CP(old, buf, shm_lpid); 1308 CP(old, buf, shm_cpid); 1309 CP(old, buf, shm_nattch); 1310 CP(old, buf, shm_atime); 1311 CP(old, buf, shm_dtime); 1312 CP(old, buf, shm_ctime); 1313 } 1314 1315 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz); 1316 if (error) 1317 goto done; 1318 1319 /* Cases in which we need to copyout */ 1320 switch (uap->cmd) { 1321 case IPC_STAT: 1322 ipcperm_new2old(&buf.shm_perm, &old.shm_perm); 1323 if (buf.shm_segsz > INT_MAX) 1324 old.shm_segsz = INT_MAX; 1325 else 1326 CP(buf, old, shm_segsz); 1327 CP(buf, old, shm_lpid); 1328 CP(buf, old, shm_cpid); 1329 if (buf.shm_nattch > SHRT_MAX) 1330 old.shm_nattch = SHRT_MAX; 1331 else 1332 CP(buf, old, shm_nattch); 1333 CP(buf, old, shm_atime); 1334 CP(buf, old, shm_dtime); 1335 CP(buf, old, shm_ctime); 1336 old.shm_internal = NULL; 1337 error = copyout(&old, uap->buf, sizeof(old)); 1338 break; 1339 } 1340 1341done: 1342 if (error) { 1343 /* Invalidate the return value */ 1344 td->td_retval[0] = -1; 1345 } 1346 return (error); 1347} 1348 1349#endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 || 1350 COMPAT_FREEBSD7 */ 1351 1352static int 1353sysvshm_modload(struct module *module, int cmd, void *arg) 1354{ 1355 int error = 0; 1356 1357 switch (cmd) { 1358 case MOD_LOAD: 1359 error = shminit(); 1360 if (error != 0) 1361 shmunload(); 1362 break; 1363 case MOD_UNLOAD: 1364 error = shmunload(); 1365 break; 1366 case MOD_SHUTDOWN: 1367 break; 1368 default: 1369 error = EINVAL; 1370 break; 1371 } 1372 return (error); 1373} 1374 1375static moduledata_t sysvshm_mod = { 1376 "sysvshm", 1377 &sysvshm_modload, 1378 NULL 1379}; 1380 1381DECLARE_MODULE(sysvshm, sysvshm_mod, SI_SUB_SYSV_SHM, SI_ORDER_FIRST); 1382MODULE_VERSION(sysvshm, 1); 1383