sysv_shm.c revision 282213
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 282213 2015-04-29 10:23:02Z trasz $"); 64 65#include "opt_compat.h" 66#include "opt_sysvipc.h" 67 68#include <sys/param.h> 69#include <sys/systm.h> 70#include <sys/kernel.h> 71#include <sys/limits.h> 72#include <sys/lock.h> 73#include <sys/sysctl.h> 74#include <sys/shm.h> 75#include <sys/proc.h> 76#include <sys/malloc.h> 77#include <sys/mman.h> 78#include <sys/module.h> 79#include <sys/mutex.h> 80#include <sys/racct.h> 81#include <sys/resourcevar.h> 82#include <sys/rwlock.h> 83#include <sys/stat.h> 84#include <sys/syscall.h> 85#include <sys/syscallsubr.h> 86#include <sys/sysent.h> 87#include <sys/sysproto.h> 88#include <sys/jail.h> 89 90#include <security/mac/mac_framework.h> 91 92#include <vm/vm.h> 93#include <vm/vm_param.h> 94#include <vm/pmap.h> 95#include <vm/vm_object.h> 96#include <vm/vm_map.h> 97#include <vm/vm_page.h> 98#include <vm/vm_pager.h> 99 100FEATURE(sysv_shm, "System V shared memory segments support"); 101 102static MALLOC_DEFINE(M_SHM, "shm", "SVID compatible shared memory segments"); 103 104static int shmget_allocate_segment(struct thread *td, 105 struct shmget_args *uap, int mode); 106static 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 113static int shm_last_free, shm_nused, shmalloced; 114vm_size_t shm_committed; 115static struct shmid_kernel *shmsegs; 116 117struct shmmap_state { 118 vm_offset_t va; 119 int shmid; 120}; 121 122static void shm_deallocate_segment(struct shmid_kernel *); 123static int shm_find_segment_by_key(key_t); 124static struct shmid_kernel *shm_find_segment(int, bool); 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 = SHMMAX, 158 .shmmin = SHMMIN, 159 .shmmni = SHMMNI, 160 .shmseg = SHMSEG, 161 .shmall = SHMALL 162}; 163 164static int shm_use_phys; 165static int shm_allow_removed; 166 167SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmax, CTLFLAG_RWTUN, &shminfo.shmmax, 0, 168 "Maximum shared memory segment size"); 169SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmin, CTLFLAG_RWTUN, &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_RWTUN, &shminfo.shmall, 0, 176 "Maximum number of pages available for shared memory"); 177SYSCTL_INT(_kern_ipc, OID_AUTO, shm_use_phys, CTLFLAG_RWTUN, 178 &shm_use_phys, 0, "Enable/Disable locking of shared memory pages in core"); 179SYSCTL_INT(_kern_ipc, OID_AUTO, shm_allow_removed, CTLFLAG_RWTUN, 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 CTLFLAG_MPSAFE, NULL, 0, sysctl_shmsegs, "", 184 "Current number of shared memory segments allocated"); 185 186static struct sx sysvshmsx; 187#define SYSVSHM_LOCK() sx_xlock(&sysvshmsx) 188#define SYSVSHM_UNLOCK() sx_xunlock(&sysvshmsx) 189#define SYSVSHM_ASSERT_LOCKED() sx_assert(&sysvshmsx, SA_XLOCKED) 190 191static int 192shm_find_segment_by_key(key_t key) 193{ 194 int i; 195 196 for (i = 0; i < shmalloced; i++) 197 if ((shmsegs[i].u.shm_perm.mode & SHMSEG_ALLOCATED) && 198 shmsegs[i].u.shm_perm.key == key) 199 return (i); 200 return (-1); 201} 202 203/* 204 * Finds segment either by shmid if is_shmid is true, or by segnum if 205 * is_shmid is false. 206 */ 207static struct shmid_kernel * 208shm_find_segment(int arg, bool is_shmid) 209{ 210 struct shmid_kernel *shmseg; 211 int segnum; 212 213 segnum = is_shmid ? IPCID_TO_IX(arg) : arg; 214 if (segnum < 0 || segnum >= shmalloced) 215 return (NULL); 216 shmseg = &shmsegs[segnum]; 217 if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 || 218 (!shm_allow_removed && 219 (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) != 0) || 220 (is_shmid && shmseg->u.shm_perm.seq != IPCID_TO_SEQ(arg))) 221 return (NULL); 222 return (shmseg); 223} 224 225static void 226shm_deallocate_segment(struct shmid_kernel *shmseg) 227{ 228 vm_size_t size; 229 230 SYSVSHM_ASSERT_LOCKED(); 231 232 vm_object_deallocate(shmseg->object); 233 shmseg->object = NULL; 234 size = round_page(shmseg->u.shm_segsz); 235 shm_committed -= btoc(size); 236 shm_nused--; 237 shmseg->u.shm_perm.mode = SHMSEG_FREE; 238#ifdef MAC 239 mac_sysvshm_cleanup(shmseg); 240#endif 241 racct_sub_cred(shmseg->cred, RACCT_NSHM, 1); 242 racct_sub_cred(shmseg->cred, RACCT_SHMSIZE, size); 243 crfree(shmseg->cred); 244 shmseg->cred = NULL; 245} 246 247static int 248shm_delete_mapping(struct vmspace *vm, struct shmmap_state *shmmap_s) 249{ 250 struct shmid_kernel *shmseg; 251 int segnum, result; 252 vm_size_t size; 253 254 SYSVSHM_ASSERT_LOCKED(); 255 segnum = IPCID_TO_IX(shmmap_s->shmid); 256 KASSERT(segnum >= 0 && segnum < shmalloced, 257 ("segnum %d shmalloced %d", segnum, shmalloced)); 258 259 shmseg = &shmsegs[segnum]; 260 size = round_page(shmseg->u.shm_segsz); 261 result = vm_map_remove(&vm->vm_map, shmmap_s->va, shmmap_s->va + size); 262 if (result != KERN_SUCCESS) 263 return (EINVAL); 264 shmmap_s->shmid = -1; 265 shmseg->u.shm_dtime = time_second; 266 if ((--shmseg->u.shm_nattch <= 0) && 267 (shmseg->u.shm_perm.mode & SHMSEG_REMOVED)) { 268 shm_deallocate_segment(shmseg); 269 shm_last_free = segnum; 270 } 271 return (0); 272} 273 274static int 275kern_shmdt_locked(struct thread *td, const void *shmaddr) 276{ 277 struct proc *p = td->td_proc; 278 struct shmmap_state *shmmap_s; 279#ifdef MAC 280 struct shmid_kernel *shmsegptr; 281#endif 282 int error, i; 283 284 SYSVSHM_ASSERT_LOCKED(); 285 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 286 return (ENOSYS); 287 shmmap_s = p->p_vmspace->vm_shm; 288 if (shmmap_s == NULL) 289 return (EINVAL); 290 for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) { 291 if (shmmap_s->shmid != -1 && 292 shmmap_s->va == (vm_offset_t)shmaddr) { 293 break; 294 } 295 } 296 if (i == shminfo.shmseg) 297 return (EINVAL); 298#ifdef MAC 299 shmsegptr = &shmsegs[IPCID_TO_IX(shmmap_s->shmid)]; 300 error = mac_sysvshm_check_shmdt(td->td_ucred, shmsegptr); 301 if (error != 0) 302 return (error); 303#endif 304 error = shm_delete_mapping(p->p_vmspace, shmmap_s); 305 return (error); 306} 307 308#ifndef _SYS_SYSPROTO_H_ 309struct shmdt_args { 310 const void *shmaddr; 311}; 312#endif 313int 314sys_shmdt(struct thread *td, struct shmdt_args *uap) 315{ 316 int error; 317 318 SYSVSHM_LOCK(); 319 error = kern_shmdt_locked(td, uap->shmaddr); 320 SYSVSHM_UNLOCK(); 321 return (error); 322} 323 324static int 325kern_shmat_locked(struct thread *td, int shmid, const void *shmaddr, 326 int shmflg) 327{ 328 struct proc *p = td->td_proc; 329 struct shmid_kernel *shmseg; 330 struct shmmap_state *shmmap_s; 331 vm_offset_t attach_va; 332 vm_prot_t prot; 333 vm_size_t size; 334 int error, i, rv; 335 336 SYSVSHM_ASSERT_LOCKED(); 337 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 338 return (ENOSYS); 339 shmmap_s = p->p_vmspace->vm_shm; 340 if (shmmap_s == NULL) { 341 shmmap_s = malloc(shminfo.shmseg * sizeof(struct shmmap_state), 342 M_SHM, M_WAITOK); 343 for (i = 0; i < shminfo.shmseg; i++) 344 shmmap_s[i].shmid = -1; 345 KASSERT(p->p_vmspace->vm_shm == NULL, ("raced")); 346 p->p_vmspace->vm_shm = shmmap_s; 347 } 348 shmseg = shm_find_segment(shmid, true); 349 if (shmseg == NULL) 350 return (EINVAL); 351 error = ipcperm(td, &shmseg->u.shm_perm, 352 (shmflg & SHM_RDONLY) ? IPC_R : IPC_R|IPC_W); 353 if (error != 0) 354 return (error); 355#ifdef MAC 356 error = mac_sysvshm_check_shmat(td->td_ucred, shmseg, shmflg); 357 if (error != 0) 358 return (error); 359#endif 360 for (i = 0; i < shminfo.shmseg; i++) { 361 if (shmmap_s->shmid == -1) 362 break; 363 shmmap_s++; 364 } 365 if (i >= shminfo.shmseg) 366 return (EMFILE); 367 size = round_page(shmseg->u.shm_segsz); 368 prot = VM_PROT_READ; 369 if ((shmflg & SHM_RDONLY) == 0) 370 prot |= VM_PROT_WRITE; 371 if (shmaddr != NULL) { 372 if ((shmflg & SHM_RND) != 0) 373 attach_va = (vm_offset_t)shmaddr & ~(SHMLBA-1); 374 else if (((vm_offset_t)shmaddr & (SHMLBA-1)) == 0) 375 attach_va = (vm_offset_t)shmaddr; 376 else 377 return (EINVAL); 378 } else { 379 /* 380 * This is just a hint to vm_map_find() about where to 381 * put it. 382 */ 383 PROC_LOCK(p); 384 attach_va = round_page((vm_offset_t)p->p_vmspace->vm_daddr + 385 lim_max(p, RLIMIT_DATA)); 386 PROC_UNLOCK(p); 387 } 388 389 vm_object_reference(shmseg->object); 390 rv = vm_map_find(&p->p_vmspace->vm_map, shmseg->object, 0, &attach_va, 391 size, 0, shmaddr != NULL ? VMFS_NO_SPACE : VMFS_OPTIMAL_SPACE, 392 prot, prot, MAP_INHERIT_SHARE | MAP_PREFAULT_PARTIAL); 393 if (rv != KERN_SUCCESS) { 394 vm_object_deallocate(shmseg->object); 395 return (ENOMEM); 396 } 397 398 shmmap_s->va = attach_va; 399 shmmap_s->shmid = shmid; 400 shmseg->u.shm_lpid = p->p_pid; 401 shmseg->u.shm_atime = time_second; 402 shmseg->u.shm_nattch++; 403 td->td_retval[0] = attach_va; 404 return (error); 405} 406 407int 408kern_shmat(struct thread *td, int shmid, const void *shmaddr, int shmflg) 409{ 410 int error; 411 412 SYSVSHM_LOCK(); 413 error = kern_shmat_locked(td, shmid, shmaddr, shmflg); 414 SYSVSHM_UNLOCK(); 415 return (error); 416} 417 418#ifndef _SYS_SYSPROTO_H_ 419struct shmat_args { 420 int shmid; 421 const void *shmaddr; 422 int shmflg; 423}; 424#endif 425int 426sys_shmat(struct thread *td, struct shmat_args *uap) 427{ 428 429 return (kern_shmat(td, uap->shmid, uap->shmaddr, uap->shmflg)); 430} 431 432static int 433kern_shmctl_locked(struct thread *td, int shmid, int cmd, void *buf, 434 size_t *bufsz) 435{ 436 struct shmid_kernel *shmseg; 437 struct shmid_ds *shmidp; 438 struct shm_info shm_info; 439 int error; 440 441 SYSVSHM_ASSERT_LOCKED(); 442 443 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 444 return (ENOSYS); 445 446 error = 0; 447 switch (cmd) { 448 /* 449 * It is possible that kern_shmctl is being called from the Linux ABI 450 * layer, in which case, we will need to implement IPC_INFO. It should 451 * be noted that other shmctl calls will be funneled through here for 452 * Linix binaries as well. 453 * 454 * NB: The Linux ABI layer will convert this data to structure(s) more 455 * consistent with the Linux ABI. 456 */ 457 case IPC_INFO: 458 memcpy(buf, &shminfo, sizeof(shminfo)); 459 if (bufsz) 460 *bufsz = sizeof(shminfo); 461 td->td_retval[0] = shmalloced; 462 return (0); 463 case SHM_INFO: { 464 shm_info.used_ids = shm_nused; 465 shm_info.shm_rss = 0; /*XXX where to get from ? */ 466 shm_info.shm_tot = 0; /*XXX where to get from ? */ 467 shm_info.shm_swp = 0; /*XXX where to get from ? */ 468 shm_info.swap_attempts = 0; /*XXX where to get from ? */ 469 shm_info.swap_successes = 0; /*XXX where to get from ? */ 470 memcpy(buf, &shm_info, sizeof(shm_info)); 471 if (bufsz != NULL) 472 *bufsz = sizeof(shm_info); 473 td->td_retval[0] = shmalloced; 474 return (0); 475 } 476 } 477 shmseg = shm_find_segment(shmid, cmd != SHM_STAT); 478 if (shmseg == NULL) 479 return (EINVAL); 480#ifdef MAC 481 error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, cmd); 482 if (error != 0) 483 return (error); 484#endif 485 switch (cmd) { 486 case SHM_STAT: 487 case IPC_STAT: 488 error = ipcperm(td, &shmseg->u.shm_perm, IPC_R); 489 if (error != 0) 490 return (error); 491 memcpy(buf, &shmseg->u, sizeof(struct shmid_ds)); 492 if (bufsz != NULL) 493 *bufsz = sizeof(struct shmid_ds); 494 if (cmd == SHM_STAT) { 495 td->td_retval[0] = IXSEQ_TO_IPCID(shmid, 496 shmseg->u.shm_perm); 497 } 498 break; 499 case IPC_SET: 500 shmidp = (struct shmid_ds *)buf; 501 error = ipcperm(td, &shmseg->u.shm_perm, IPC_M); 502 if (error != 0) 503 return (error); 504 shmseg->u.shm_perm.uid = shmidp->shm_perm.uid; 505 shmseg->u.shm_perm.gid = shmidp->shm_perm.gid; 506 shmseg->u.shm_perm.mode = 507 (shmseg->u.shm_perm.mode & ~ACCESSPERMS) | 508 (shmidp->shm_perm.mode & ACCESSPERMS); 509 shmseg->u.shm_ctime = time_second; 510 break; 511 case IPC_RMID: 512 error = ipcperm(td, &shmseg->u.shm_perm, IPC_M); 513 if (error != 0) 514 return (error); 515 shmseg->u.shm_perm.key = IPC_PRIVATE; 516 shmseg->u.shm_perm.mode |= SHMSEG_REMOVED; 517 if (shmseg->u.shm_nattch <= 0) { 518 shm_deallocate_segment(shmseg); 519 shm_last_free = IPCID_TO_IX(shmid); 520 } 521 break; 522#if 0 523 case SHM_LOCK: 524 case SHM_UNLOCK: 525#endif 526 default: 527 error = EINVAL; 528 break; 529 } 530 return (error); 531} 532 533int 534kern_shmctl(struct thread *td, int shmid, int cmd, void *buf, size_t *bufsz) 535{ 536 int error; 537 538 SYSVSHM_LOCK(); 539 error = kern_shmctl_locked(td, shmid, cmd, buf, bufsz); 540 SYSVSHM_UNLOCK(); 541 return (error); 542} 543 544 545#ifndef _SYS_SYSPROTO_H_ 546struct shmctl_args { 547 int shmid; 548 int cmd; 549 struct shmid_ds *buf; 550}; 551#endif 552int 553sys_shmctl(struct thread *td, struct shmctl_args *uap) 554{ 555 int error = 0; 556 struct shmid_ds buf; 557 size_t bufsz; 558 559 /* 560 * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support 561 * Linux binaries. If we see the call come through the FreeBSD ABI, 562 * return an error back to the user since we do not to support this. 563 */ 564 if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO || 565 uap->cmd == SHM_STAT) 566 return (EINVAL); 567 568 /* IPC_SET needs to copyin the buffer before calling kern_shmctl */ 569 if (uap->cmd == IPC_SET) { 570 if ((error = copyin(uap->buf, &buf, sizeof(struct shmid_ds)))) 571 goto done; 572 } 573 574 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz); 575 if (error) 576 goto done; 577 578 /* Cases in which we need to copyout */ 579 switch (uap->cmd) { 580 case IPC_STAT: 581 error = copyout(&buf, uap->buf, bufsz); 582 break; 583 } 584 585done: 586 if (error) { 587 /* Invalidate the return value */ 588 td->td_retval[0] = -1; 589 } 590 return (error); 591} 592 593 594static int 595shmget_existing(struct thread *td, struct shmget_args *uap, int mode, 596 int segnum) 597{ 598 struct shmid_kernel *shmseg; 599#ifdef MAC 600 int error; 601#endif 602 603 SYSVSHM_ASSERT_LOCKED(); 604 KASSERT(segnum >= 0 && segnum < shmalloced, 605 ("segnum %d shmalloced %d", segnum, shmalloced)); 606 shmseg = &shmsegs[segnum]; 607 if ((uap->shmflg & (IPC_CREAT | IPC_EXCL)) == (IPC_CREAT | IPC_EXCL)) 608 return (EEXIST); 609#ifdef MAC 610 error = mac_sysvshm_check_shmget(td->td_ucred, shmseg, uap->shmflg); 611 if (error != 0) 612 return (error); 613#endif 614 if (uap->size != 0 && uap->size > shmseg->u.shm_segsz) 615 return (EINVAL); 616 td->td_retval[0] = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm); 617 return (0); 618} 619 620static int 621shmget_allocate_segment(struct thread *td, struct shmget_args *uap, int mode) 622{ 623 struct ucred *cred = td->td_ucred; 624 struct shmid_kernel *shmseg; 625 vm_object_t shm_object; 626 int i, segnum; 627 size_t size; 628 629 SYSVSHM_ASSERT_LOCKED(); 630 631 if (uap->size < shminfo.shmmin || uap->size > shminfo.shmmax) 632 return (EINVAL); 633 if (shm_nused >= shminfo.shmmni) /* Any shmids left? */ 634 return (ENOSPC); 635 size = round_page(uap->size); 636 if (shm_committed + btoc(size) > shminfo.shmall) 637 return (ENOMEM); 638 if (shm_last_free < 0) { 639 shmrealloc(); /* Maybe expand the shmsegs[] array. */ 640 for (i = 0; i < shmalloced; i++) 641 if (shmsegs[i].u.shm_perm.mode & SHMSEG_FREE) 642 break; 643 if (i == shmalloced) 644 return (ENOSPC); 645 segnum = i; 646 } else { 647 segnum = shm_last_free; 648 shm_last_free = -1; 649 } 650 KASSERT(segnum >= 0 && segnum < shmalloced, 651 ("segnum %d shmalloced %d", segnum, shmalloced)); 652 shmseg = &shmsegs[segnum]; 653#ifdef RACCT 654 if (racct_enable) { 655 PROC_LOCK(td->td_proc); 656 if (racct_add(td->td_proc, RACCT_NSHM, 1)) { 657 PROC_UNLOCK(td->td_proc); 658 return (ENOSPC); 659 } 660 if (racct_add(td->td_proc, RACCT_SHMSIZE, size)) { 661 racct_sub(td->td_proc, RACCT_NSHM, 1); 662 PROC_UNLOCK(td->td_proc); 663 return (ENOMEM); 664 } 665 PROC_UNLOCK(td->td_proc); 666 } 667#endif 668 669 /* 670 * We make sure that we have allocated a pager before we need 671 * to. 672 */ 673 shm_object = vm_pager_allocate(shm_use_phys ? OBJT_PHYS : OBJT_SWAP, 674 0, size, VM_PROT_DEFAULT, 0, cred); 675 if (shm_object == NULL) { 676#ifdef RACCT 677 if (racct_enable) { 678 PROC_LOCK(td->td_proc); 679 racct_sub(td->td_proc, RACCT_NSHM, 1); 680 racct_sub(td->td_proc, RACCT_SHMSIZE, size); 681 PROC_UNLOCK(td->td_proc); 682 } 683#endif 684 return (ENOMEM); 685 } 686 shm_object->pg_color = 0; 687 VM_OBJECT_WLOCK(shm_object); 688 vm_object_clear_flag(shm_object, OBJ_ONEMAPPING); 689 vm_object_set_flag(shm_object, OBJ_COLORED | OBJ_NOSPLIT); 690 VM_OBJECT_WUNLOCK(shm_object); 691 692 shmseg->object = shm_object; 693 shmseg->u.shm_perm.cuid = shmseg->u.shm_perm.uid = cred->cr_uid; 694 shmseg->u.shm_perm.cgid = shmseg->u.shm_perm.gid = cred->cr_gid; 695 shmseg->u.shm_perm.mode = (mode & ACCESSPERMS) | SHMSEG_ALLOCATED; 696 shmseg->u.shm_perm.key = uap->key; 697 shmseg->u.shm_perm.seq = (shmseg->u.shm_perm.seq + 1) & 0x7fff; 698 shmseg->cred = crhold(cred); 699 shmseg->u.shm_segsz = uap->size; 700 shmseg->u.shm_cpid = td->td_proc->p_pid; 701 shmseg->u.shm_lpid = shmseg->u.shm_nattch = 0; 702 shmseg->u.shm_atime = shmseg->u.shm_dtime = 0; 703#ifdef MAC 704 mac_sysvshm_create(cred, shmseg); 705#endif 706 shmseg->u.shm_ctime = time_second; 707 shm_committed += btoc(size); 708 shm_nused++; 709 td->td_retval[0] = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm); 710 711 return (0); 712} 713 714#ifndef _SYS_SYSPROTO_H_ 715struct shmget_args { 716 key_t key; 717 size_t size; 718 int shmflg; 719}; 720#endif 721int 722sys_shmget(struct thread *td, struct shmget_args *uap) 723{ 724 int segnum, mode; 725 int error; 726 727 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 728 return (ENOSYS); 729 mode = uap->shmflg & ACCESSPERMS; 730 SYSVSHM_LOCK(); 731 if (uap->key == IPC_PRIVATE) { 732 error = shmget_allocate_segment(td, uap, mode); 733 } else { 734 segnum = shm_find_segment_by_key(uap->key); 735 if (segnum >= 0) 736 error = shmget_existing(td, uap, mode, segnum); 737 else if ((uap->shmflg & IPC_CREAT) == 0) 738 error = ENOENT; 739 else 740 error = shmget_allocate_segment(td, uap, mode); 741 } 742 SYSVSHM_UNLOCK(); 743 return (error); 744} 745 746static void 747shmfork_myhook(struct proc *p1, struct proc *p2) 748{ 749 struct shmmap_state *shmmap_s; 750 size_t size; 751 int i; 752 753 SYSVSHM_LOCK(); 754 size = shminfo.shmseg * sizeof(struct shmmap_state); 755 shmmap_s = malloc(size, M_SHM, M_WAITOK); 756 bcopy(p1->p_vmspace->vm_shm, shmmap_s, size); 757 p2->p_vmspace->vm_shm = shmmap_s; 758 for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) { 759 if (shmmap_s->shmid != -1) { 760 KASSERT(IPCID_TO_IX(shmmap_s->shmid) >= 0 && 761 IPCID_TO_IX(shmmap_s->shmid) < shmalloced, 762 ("segnum %d shmalloced %d", 763 IPCID_TO_IX(shmmap_s->shmid), shmalloced)); 764 shmsegs[IPCID_TO_IX(shmmap_s->shmid)].u.shm_nattch++; 765 } 766 } 767 SYSVSHM_UNLOCK(); 768} 769 770static void 771shmexit_myhook(struct vmspace *vm) 772{ 773 struct shmmap_state *base, *shm; 774 int i; 775 776 base = vm->vm_shm; 777 if (base != NULL) { 778 vm->vm_shm = NULL; 779 SYSVSHM_LOCK(); 780 for (i = 0, shm = base; i < shminfo.shmseg; i++, shm++) { 781 if (shm->shmid != -1) 782 shm_delete_mapping(vm, shm); 783 } 784 SYSVSHM_UNLOCK(); 785 free(base, M_SHM); 786 } 787} 788 789static void 790shmrealloc(void) 791{ 792 struct shmid_kernel *newsegs; 793 int i; 794 795 SYSVSHM_ASSERT_LOCKED(); 796 797 if (shmalloced >= shminfo.shmmni) 798 return; 799 800 newsegs = malloc(shminfo.shmmni * sizeof(*newsegs), M_SHM, M_WAITOK); 801 for (i = 0; i < shmalloced; i++) 802 bcopy(&shmsegs[i], &newsegs[i], sizeof(newsegs[0])); 803 for (; i < shminfo.shmmni; i++) { 804 shmsegs[i].u.shm_perm.mode = SHMSEG_FREE; 805 shmsegs[i].u.shm_perm.seq = 0; 806#ifdef MAC 807 mac_sysvshm_init(&shmsegs[i]); 808#endif 809 } 810 free(shmsegs, M_SHM); 811 shmsegs = newsegs; 812 shmalloced = shminfo.shmmni; 813} 814 815static struct syscall_helper_data shm_syscalls[] = { 816 SYSCALL_INIT_HELPER(shmat), 817 SYSCALL_INIT_HELPER(shmctl), 818 SYSCALL_INIT_HELPER(shmdt), 819 SYSCALL_INIT_HELPER(shmget), 820#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 821 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 822 SYSCALL_INIT_HELPER_COMPAT(freebsd7_shmctl), 823#endif 824#if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43)) 825 SYSCALL_INIT_HELPER(shmsys), 826#endif 827 SYSCALL_INIT_LAST 828}; 829 830#ifdef COMPAT_FREEBSD32 831#include <compat/freebsd32/freebsd32.h> 832#include <compat/freebsd32/freebsd32_ipc.h> 833#include <compat/freebsd32/freebsd32_proto.h> 834#include <compat/freebsd32/freebsd32_signal.h> 835#include <compat/freebsd32/freebsd32_syscall.h> 836#include <compat/freebsd32/freebsd32_util.h> 837 838static struct syscall_helper_data shm32_syscalls[] = { 839 SYSCALL32_INIT_HELPER_COMPAT(shmat), 840 SYSCALL32_INIT_HELPER_COMPAT(shmdt), 841 SYSCALL32_INIT_HELPER_COMPAT(shmget), 842 SYSCALL32_INIT_HELPER(freebsd32_shmsys), 843 SYSCALL32_INIT_HELPER(freebsd32_shmctl), 844#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 845 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 846 SYSCALL32_INIT_HELPER(freebsd7_freebsd32_shmctl), 847#endif 848 SYSCALL_INIT_LAST 849}; 850#endif 851 852static int 853shminit(void) 854{ 855 int i, error; 856 857#ifndef BURN_BRIDGES 858 if (TUNABLE_ULONG_FETCH("kern.ipc.shmmaxpgs", &shminfo.shmall) != 0) 859 printf("kern.ipc.shmmaxpgs is now called kern.ipc.shmall!\n"); 860#endif 861 if (shminfo.shmmax == SHMMAX) { 862 /* Initialize shmmax dealing with possible overflow. */ 863 for (i = PAGE_SIZE; i != 0; i--) { 864 shminfo.shmmax = shminfo.shmall * i; 865 if ((shminfo.shmmax / shminfo.shmall) == (u_long)i) 866 break; 867 } 868 } 869 shmalloced = shminfo.shmmni; 870 shmsegs = malloc(shmalloced * sizeof(shmsegs[0]), M_SHM, M_WAITOK); 871 for (i = 0; i < shmalloced; i++) { 872 shmsegs[i].u.shm_perm.mode = SHMSEG_FREE; 873 shmsegs[i].u.shm_perm.seq = 0; 874#ifdef MAC 875 mac_sysvshm_init(&shmsegs[i]); 876#endif 877 } 878 shm_last_free = 0; 879 shm_nused = 0; 880 shm_committed = 0; 881 sx_init(&sysvshmsx, "sysvshmsx"); 882 shmexit_hook = &shmexit_myhook; 883 shmfork_hook = &shmfork_myhook; 884 885 error = syscall_helper_register(shm_syscalls, SY_THR_STATIC_KLD); 886 if (error != 0) 887 return (error); 888#ifdef COMPAT_FREEBSD32 889 error = syscall32_helper_register(shm32_syscalls, SY_THR_STATIC_KLD); 890 if (error != 0) 891 return (error); 892#endif 893 return (0); 894} 895 896static int 897shmunload(void) 898{ 899 int i; 900 901 if (shm_nused > 0) 902 return (EBUSY); 903 904#ifdef COMPAT_FREEBSD32 905 syscall32_helper_unregister(shm32_syscalls); 906#endif 907 syscall_helper_unregister(shm_syscalls); 908 909 for (i = 0; i < shmalloced; i++) { 910#ifdef MAC 911 mac_sysvshm_destroy(&shmsegs[i]); 912#endif 913 /* 914 * Objects might be still mapped into the processes 915 * address spaces. Actual free would happen on the 916 * last mapping destruction. 917 */ 918 if (shmsegs[i].u.shm_perm.mode != SHMSEG_FREE) 919 vm_object_deallocate(shmsegs[i].object); 920 } 921 free(shmsegs, M_SHM); 922 shmexit_hook = NULL; 923 shmfork_hook = NULL; 924 sx_destroy(&sysvshmsx); 925 return (0); 926} 927 928static int 929sysctl_shmsegs(SYSCTL_HANDLER_ARGS) 930{ 931 int error; 932 933 SYSVSHM_LOCK(); 934 error = SYSCTL_OUT(req, shmsegs, shmalloced * sizeof(shmsegs[0])); 935 SYSVSHM_UNLOCK(); 936 return (error); 937} 938 939#if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43)) 940struct oshmid_ds { 941 struct ipc_perm_old shm_perm; /* operation perms */ 942 int shm_segsz; /* size of segment (bytes) */ 943 u_short shm_cpid; /* pid, creator */ 944 u_short shm_lpid; /* pid, last operation */ 945 short shm_nattch; /* no. of current attaches */ 946 time_t shm_atime; /* last attach time */ 947 time_t shm_dtime; /* last detach time */ 948 time_t shm_ctime; /* last change time */ 949 void *shm_handle; /* internal handle for shm segment */ 950}; 951 952struct oshmctl_args { 953 int shmid; 954 int cmd; 955 struct oshmid_ds *ubuf; 956}; 957 958static int 959oshmctl(struct thread *td, struct oshmctl_args *uap) 960{ 961#ifdef COMPAT_43 962 int error = 0; 963 struct shmid_kernel *shmseg; 964 struct oshmid_ds outbuf; 965 966 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 967 return (ENOSYS); 968 if (uap->cmd != IPC_STAT) { 969 return (freebsd7_shmctl(td, 970 (struct freebsd7_shmctl_args *)uap)); 971 } 972 SYSVSHM_LOCK(); 973 shmseg = shm_find_segment(uap->shmid, true); 974 if (shmseg == NULL) { 975 SYSVSHM_UNLOCK(); 976 return (EINVAL); 977 } 978 error = ipcperm(td, &shmseg->u.shm_perm, IPC_R); 979 if (error != 0) { 980 SYSVSHM_UNLOCK(); 981 return (error); 982 } 983#ifdef MAC 984 error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, uap->cmd); 985 if (error != 0) { 986 SYSVSHM_UNLOCK(); 987 return (error); 988 } 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 SYSVSHM_UNLOCK(); 1000 error = copyout(&outbuf, uap->ubuf, sizeof(outbuf)); 1001 return (error); 1002#else 1003 return (EINVAL); 1004#endif 1005} 1006 1007/* XXX casting to (sy_call_t *) is bogus, as usual. */ 1008static sy_call_t *shmcalls[] = { 1009 (sy_call_t *)sys_shmat, (sy_call_t *)oshmctl, 1010 (sy_call_t *)sys_shmdt, (sy_call_t *)sys_shmget, 1011 (sy_call_t *)freebsd7_shmctl 1012}; 1013 1014#ifndef _SYS_SYSPROTO_H_ 1015/* XXX actually varargs. */ 1016struct shmsys_args { 1017 int which; 1018 int a2; 1019 int a3; 1020 int a4; 1021}; 1022#endif 1023int 1024sys_shmsys(struct thread *td, struct shmsys_args *uap) 1025{ 1026 int error; 1027 1028 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 1029 return (ENOSYS); 1030 if (uap->which < 0 || uap->which >= nitems(shmcalls)) 1031 return (EINVAL); 1032 error = (*shmcalls[uap->which])(td, &uap->a2); 1033 return (error); 1034} 1035 1036#endif /* i386 && (COMPAT_FREEBSD4 || COMPAT_43) */ 1037 1038#ifdef COMPAT_FREEBSD32 1039 1040int 1041freebsd32_shmsys(struct thread *td, struct freebsd32_shmsys_args *uap) 1042{ 1043 1044#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1045 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1046 switch (uap->which) { 1047 case 0: { /* shmat */ 1048 struct shmat_args ap; 1049 1050 ap.shmid = uap->a2; 1051 ap.shmaddr = PTRIN(uap->a3); 1052 ap.shmflg = uap->a4; 1053 return (sysent[SYS_shmat].sy_call(td, &ap)); 1054 } 1055 case 2: { /* shmdt */ 1056 struct shmdt_args ap; 1057 1058 ap.shmaddr = PTRIN(uap->a2); 1059 return (sysent[SYS_shmdt].sy_call(td, &ap)); 1060 } 1061 case 3: { /* shmget */ 1062 struct shmget_args ap; 1063 1064 ap.key = uap->a2; 1065 ap.size = uap->a3; 1066 ap.shmflg = uap->a4; 1067 return (sysent[SYS_shmget].sy_call(td, &ap)); 1068 } 1069 case 4: { /* shmctl */ 1070 struct freebsd7_freebsd32_shmctl_args ap; 1071 1072 ap.shmid = uap->a2; 1073 ap.cmd = uap->a3; 1074 ap.buf = PTRIN(uap->a4); 1075 return (freebsd7_freebsd32_shmctl(td, &ap)); 1076 } 1077 case 1: /* oshmctl */ 1078 default: 1079 return (EINVAL); 1080 } 1081#else 1082 return (nosys(td, NULL)); 1083#endif 1084} 1085 1086#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1087 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1088int 1089freebsd7_freebsd32_shmctl(struct thread *td, 1090 struct freebsd7_freebsd32_shmctl_args *uap) 1091{ 1092 int error = 0; 1093 union { 1094 struct shmid_ds shmid_ds; 1095 struct shm_info shm_info; 1096 struct shminfo shminfo; 1097 } u; 1098 union { 1099 struct shmid_ds32_old shmid_ds32; 1100 struct shm_info32 shm_info32; 1101 struct shminfo32 shminfo32; 1102 } u32; 1103 size_t sz; 1104 1105 if (uap->cmd == IPC_SET) { 1106 if ((error = copyin(uap->buf, &u32.shmid_ds32, 1107 sizeof(u32.shmid_ds32)))) 1108 goto done; 1109 freebsd32_ipcperm_old_in(&u32.shmid_ds32.shm_perm, 1110 &u.shmid_ds.shm_perm); 1111 CP(u32.shmid_ds32, u.shmid_ds, shm_segsz); 1112 CP(u32.shmid_ds32, u.shmid_ds, shm_lpid); 1113 CP(u32.shmid_ds32, u.shmid_ds, shm_cpid); 1114 CP(u32.shmid_ds32, u.shmid_ds, shm_nattch); 1115 CP(u32.shmid_ds32, u.shmid_ds, shm_atime); 1116 CP(u32.shmid_ds32, u.shmid_ds, shm_dtime); 1117 CP(u32.shmid_ds32, u.shmid_ds, shm_ctime); 1118 } 1119 1120 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz); 1121 if (error) 1122 goto done; 1123 1124 /* Cases in which we need to copyout */ 1125 switch (uap->cmd) { 1126 case IPC_INFO: 1127 CP(u.shminfo, u32.shminfo32, shmmax); 1128 CP(u.shminfo, u32.shminfo32, shmmin); 1129 CP(u.shminfo, u32.shminfo32, shmmni); 1130 CP(u.shminfo, u32.shminfo32, shmseg); 1131 CP(u.shminfo, u32.shminfo32, shmall); 1132 error = copyout(&u32.shminfo32, uap->buf, 1133 sizeof(u32.shminfo32)); 1134 break; 1135 case SHM_INFO: 1136 CP(u.shm_info, u32.shm_info32, used_ids); 1137 CP(u.shm_info, u32.shm_info32, shm_rss); 1138 CP(u.shm_info, u32.shm_info32, shm_tot); 1139 CP(u.shm_info, u32.shm_info32, shm_swp); 1140 CP(u.shm_info, u32.shm_info32, swap_attempts); 1141 CP(u.shm_info, u32.shm_info32, swap_successes); 1142 error = copyout(&u32.shm_info32, uap->buf, 1143 sizeof(u32.shm_info32)); 1144 break; 1145 case SHM_STAT: 1146 case IPC_STAT: 1147 freebsd32_ipcperm_old_out(&u.shmid_ds.shm_perm, 1148 &u32.shmid_ds32.shm_perm); 1149 if (u.shmid_ds.shm_segsz > INT32_MAX) 1150 u32.shmid_ds32.shm_segsz = INT32_MAX; 1151 else 1152 CP(u.shmid_ds, u32.shmid_ds32, shm_segsz); 1153 CP(u.shmid_ds, u32.shmid_ds32, shm_lpid); 1154 CP(u.shmid_ds, u32.shmid_ds32, shm_cpid); 1155 CP(u.shmid_ds, u32.shmid_ds32, shm_nattch); 1156 CP(u.shmid_ds, u32.shmid_ds32, shm_atime); 1157 CP(u.shmid_ds, u32.shmid_ds32, shm_dtime); 1158 CP(u.shmid_ds, u32.shmid_ds32, shm_ctime); 1159 u32.shmid_ds32.shm_internal = 0; 1160 error = copyout(&u32.shmid_ds32, uap->buf, 1161 sizeof(u32.shmid_ds32)); 1162 break; 1163 } 1164 1165done: 1166 if (error) { 1167 /* Invalidate the return value */ 1168 td->td_retval[0] = -1; 1169 } 1170 return (error); 1171} 1172#endif 1173 1174int 1175freebsd32_shmctl(struct thread *td, struct freebsd32_shmctl_args *uap) 1176{ 1177 int error = 0; 1178 union { 1179 struct shmid_ds shmid_ds; 1180 struct shm_info shm_info; 1181 struct shminfo shminfo; 1182 } u; 1183 union { 1184 struct shmid_ds32 shmid_ds32; 1185 struct shm_info32 shm_info32; 1186 struct shminfo32 shminfo32; 1187 } u32; 1188 size_t sz; 1189 1190 if (uap->cmd == IPC_SET) { 1191 if ((error = copyin(uap->buf, &u32.shmid_ds32, 1192 sizeof(u32.shmid_ds32)))) 1193 goto done; 1194 freebsd32_ipcperm_in(&u32.shmid_ds32.shm_perm, 1195 &u.shmid_ds.shm_perm); 1196 CP(u32.shmid_ds32, u.shmid_ds, shm_segsz); 1197 CP(u32.shmid_ds32, u.shmid_ds, shm_lpid); 1198 CP(u32.shmid_ds32, u.shmid_ds, shm_cpid); 1199 CP(u32.shmid_ds32, u.shmid_ds, shm_nattch); 1200 CP(u32.shmid_ds32, u.shmid_ds, shm_atime); 1201 CP(u32.shmid_ds32, u.shmid_ds, shm_dtime); 1202 CP(u32.shmid_ds32, u.shmid_ds, shm_ctime); 1203 } 1204 1205 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz); 1206 if (error) 1207 goto done; 1208 1209 /* Cases in which we need to copyout */ 1210 switch (uap->cmd) { 1211 case IPC_INFO: 1212 CP(u.shminfo, u32.shminfo32, shmmax); 1213 CP(u.shminfo, u32.shminfo32, shmmin); 1214 CP(u.shminfo, u32.shminfo32, shmmni); 1215 CP(u.shminfo, u32.shminfo32, shmseg); 1216 CP(u.shminfo, u32.shminfo32, shmall); 1217 error = copyout(&u32.shminfo32, uap->buf, 1218 sizeof(u32.shminfo32)); 1219 break; 1220 case SHM_INFO: 1221 CP(u.shm_info, u32.shm_info32, used_ids); 1222 CP(u.shm_info, u32.shm_info32, shm_rss); 1223 CP(u.shm_info, u32.shm_info32, shm_tot); 1224 CP(u.shm_info, u32.shm_info32, shm_swp); 1225 CP(u.shm_info, u32.shm_info32, swap_attempts); 1226 CP(u.shm_info, u32.shm_info32, swap_successes); 1227 error = copyout(&u32.shm_info32, uap->buf, 1228 sizeof(u32.shm_info32)); 1229 break; 1230 case SHM_STAT: 1231 case IPC_STAT: 1232 freebsd32_ipcperm_out(&u.shmid_ds.shm_perm, 1233 &u32.shmid_ds32.shm_perm); 1234 if (u.shmid_ds.shm_segsz > INT32_MAX) 1235 u32.shmid_ds32.shm_segsz = INT32_MAX; 1236 else 1237 CP(u.shmid_ds, u32.shmid_ds32, shm_segsz); 1238 CP(u.shmid_ds, u32.shmid_ds32, shm_lpid); 1239 CP(u.shmid_ds, u32.shmid_ds32, shm_cpid); 1240 CP(u.shmid_ds, u32.shmid_ds32, shm_nattch); 1241 CP(u.shmid_ds, u32.shmid_ds32, shm_atime); 1242 CP(u.shmid_ds, u32.shmid_ds32, shm_dtime); 1243 CP(u.shmid_ds, u32.shmid_ds32, shm_ctime); 1244 error = copyout(&u32.shmid_ds32, uap->buf, 1245 sizeof(u32.shmid_ds32)); 1246 break; 1247 } 1248 1249done: 1250 if (error) { 1251 /* Invalidate the return value */ 1252 td->td_retval[0] = -1; 1253 } 1254 return (error); 1255} 1256#endif 1257 1258#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1259 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1260 1261#ifndef CP 1262#define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0) 1263#endif 1264 1265#ifndef _SYS_SYSPROTO_H_ 1266struct freebsd7_shmctl_args { 1267 int shmid; 1268 int cmd; 1269 struct shmid_ds_old *buf; 1270}; 1271#endif 1272int 1273freebsd7_shmctl(struct thread *td, struct freebsd7_shmctl_args *uap) 1274{ 1275 int error = 0; 1276 struct shmid_ds_old old; 1277 struct shmid_ds buf; 1278 size_t bufsz; 1279 1280 /* 1281 * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support 1282 * Linux binaries. If we see the call come through the FreeBSD ABI, 1283 * return an error back to the user since we do not to support this. 1284 */ 1285 if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO || 1286 uap->cmd == SHM_STAT) 1287 return (EINVAL); 1288 1289 /* IPC_SET needs to copyin the buffer before calling kern_shmctl */ 1290 if (uap->cmd == IPC_SET) { 1291 if ((error = copyin(uap->buf, &old, sizeof(old)))) 1292 goto done; 1293 ipcperm_old2new(&old.shm_perm, &buf.shm_perm); 1294 CP(old, buf, shm_segsz); 1295 CP(old, buf, shm_lpid); 1296 CP(old, buf, shm_cpid); 1297 CP(old, buf, shm_nattch); 1298 CP(old, buf, shm_atime); 1299 CP(old, buf, shm_dtime); 1300 CP(old, buf, shm_ctime); 1301 } 1302 1303 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz); 1304 if (error) 1305 goto done; 1306 1307 /* Cases in which we need to copyout */ 1308 switch (uap->cmd) { 1309 case IPC_STAT: 1310 ipcperm_new2old(&buf.shm_perm, &old.shm_perm); 1311 if (buf.shm_segsz > INT_MAX) 1312 old.shm_segsz = INT_MAX; 1313 else 1314 CP(buf, old, shm_segsz); 1315 CP(buf, old, shm_lpid); 1316 CP(buf, old, shm_cpid); 1317 if (buf.shm_nattch > SHRT_MAX) 1318 old.shm_nattch = SHRT_MAX; 1319 else 1320 CP(buf, old, shm_nattch); 1321 CP(buf, old, shm_atime); 1322 CP(buf, old, shm_dtime); 1323 CP(buf, old, shm_ctime); 1324 old.shm_internal = NULL; 1325 error = copyout(&old, uap->buf, sizeof(old)); 1326 break; 1327 } 1328 1329done: 1330 if (error) { 1331 /* Invalidate the return value */ 1332 td->td_retval[0] = -1; 1333 } 1334 return (error); 1335} 1336 1337#endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 || 1338 COMPAT_FREEBSD7 */ 1339 1340static int 1341sysvshm_modload(struct module *module, int cmd, void *arg) 1342{ 1343 int error = 0; 1344 1345 switch (cmd) { 1346 case MOD_LOAD: 1347 error = shminit(); 1348 if (error != 0) 1349 shmunload(); 1350 break; 1351 case MOD_UNLOAD: 1352 error = shmunload(); 1353 break; 1354 case MOD_SHUTDOWN: 1355 break; 1356 default: 1357 error = EINVAL; 1358 break; 1359 } 1360 return (error); 1361} 1362 1363static moduledata_t sysvshm_mod = { 1364 "sysvshm", 1365 &sysvshm_modload, 1366 NULL 1367}; 1368 1369DECLARE_MODULE(sysvshm, sysvshm_mod, SI_SUB_SYSV_SHM, SI_ORDER_FIRST); 1370MODULE_VERSION(sysvshm, 1); 1371