1 /* $NetBSD: sysv_shm.c,v 1.23 1994/07/04 23:25:12 glass Exp $ */
3 * SPDX-License-Identifier: BSD-4-Clause AND BSD-2-Clause-FreeBSD
5 * Copyright (c) 1994 Adam Glass and Charles Hannum. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Adam Glass and Charles
19 * 4. The names of the authors may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 * Copyright (c) 2003-2005 McAfee, Inc.
35 * Copyright (c) 2016-2017 Robert N. M. Watson
36 * All rights reserved.
38 * This software was developed for the FreeBSD Project in part by McAfee
39 * Research, the Security Research Division of McAfee, Inc under DARPA/SPAWAR
40 * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS research
43 * Portions of this software were developed by BAE Systems, the University of
44 * Cambridge Computer Laboratory, and Memorial University under DARPA/AFRL
45 * contract FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent
46 * Computing (TC) research program.
48 * Redistribution and use in source and binary forms, with or without
49 * modification, are permitted provided that the following conditions
51 * 1. Redistributions of source code must retain the above copyright
52 * notice, this list of conditions and the following disclaimer.
53 * 2. Redistributions in binary form must reproduce the above copyright
54 * notice, this list of conditions and the following disclaimer in the
55 * documentation and/or other materials provided with the distribution.
57 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
58 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
59 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
60 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
61 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
62 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
63 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
64 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
65 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
66 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
70 #include <sys/cdefs.h>
71 __FBSDID("$FreeBSD$");
73 #include "opt_compat.h"
74 #include "opt_sysvipc.h"
76 #include <sys/param.h>
77 #include <sys/systm.h>
78 #include <sys/kernel.h>
79 #include <sys/limits.h>
81 #include <sys/sysctl.h>
84 #include <sys/malloc.h>
86 #include <sys/module.h>
87 #include <sys/mutex.h>
88 #include <sys/racct.h>
89 #include <sys/resourcevar.h>
90 #include <sys/rwlock.h>
92 #include <sys/syscall.h>
93 #include <sys/syscallsubr.h>
94 #include <sys/sysent.h>
95 #include <sys/sysproto.h>
98 #include <security/audit/audit.h>
99 #include <security/mac/mac_framework.h>
102 #include <vm/vm_param.h>
104 #include <vm/vm_object.h>
105 #include <vm/vm_map.h>
106 #include <vm/vm_page.h>
107 #include <vm/vm_pager.h>
109 FEATURE(sysv_shm, "System V shared memory segments support");
111 static MALLOC_DEFINE(M_SHM, "shm", "SVID compatible shared memory segments");
113 static int shmget_allocate_segment(struct thread *td,
114 struct shmget_args *uap, int mode);
115 static int shmget_existing(struct thread *td, struct shmget_args *uap,
116 int mode, int segnum);
118 #define SHMSEG_FREE 0x0200
119 #define SHMSEG_REMOVED 0x0400
120 #define SHMSEG_ALLOCATED 0x0800
122 static int shm_last_free, shm_nused, shmalloced;
123 vm_size_t shm_committed;
124 static struct shmid_kernel *shmsegs;
125 static unsigned shm_prison_slot;
127 struct shmmap_state {
132 static void shm_deallocate_segment(struct shmid_kernel *);
133 static int shm_find_segment_by_key(struct prison *, key_t);
134 static struct shmid_kernel *shm_find_segment(struct prison *, int, bool);
135 static int shm_delete_mapping(struct vmspace *vm, struct shmmap_state *);
136 static void shmrealloc(void);
137 static int shminit(void);
138 static int sysvshm_modload(struct module *, int, void *);
139 static int shmunload(void);
140 static void shmexit_myhook(struct vmspace *vm);
141 static void shmfork_myhook(struct proc *p1, struct proc *p2);
142 static int sysctl_shmsegs(SYSCTL_HANDLER_ARGS);
143 static void shm_remove(struct shmid_kernel *, int);
144 static struct prison *shm_find_prison(struct ucred *);
145 static int shm_prison_cansee(struct prison *, struct shmid_kernel *);
146 static int shm_prison_check(void *, void *);
147 static int shm_prison_set(void *, void *);
148 static int shm_prison_get(void *, void *);
149 static int shm_prison_remove(void *, void *);
150 static void shm_prison_cleanup(struct prison *);
156 #define SHMMAXPGS 131072 /* Note: sysv shared memory is swap backed. */
159 #define SHMMAX (SHMMAXPGS*PAGE_SIZE)
171 #define SHMALL (SHMMAXPGS)
174 struct shminfo shminfo = {
182 static int shm_use_phys;
183 static int shm_allow_removed = 1;
185 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmax, CTLFLAG_RWTUN, &shminfo.shmmax, 0,
186 "Maximum shared memory segment size");
187 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmin, CTLFLAG_RWTUN, &shminfo.shmmin, 0,
188 "Minimum shared memory segment size");
189 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmni, CTLFLAG_RDTUN, &shminfo.shmmni, 0,
190 "Number of shared memory identifiers");
191 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmseg, CTLFLAG_RDTUN, &shminfo.shmseg, 0,
192 "Number of segments per process");
193 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmall, CTLFLAG_RWTUN, &shminfo.shmall, 0,
194 "Maximum number of pages available for shared memory");
195 SYSCTL_INT(_kern_ipc, OID_AUTO, shm_use_phys, CTLFLAG_RWTUN,
196 &shm_use_phys, 0, "Enable/Disable locking of shared memory pages in core");
197 SYSCTL_INT(_kern_ipc, OID_AUTO, shm_allow_removed, CTLFLAG_RWTUN,
198 &shm_allow_removed, 0,
199 "Enable/Disable attachment to attached segments marked for removal");
200 SYSCTL_PROC(_kern_ipc, OID_AUTO, shmsegs, CTLTYPE_OPAQUE | CTLFLAG_RD |
201 CTLFLAG_MPSAFE, NULL, 0, sysctl_shmsegs, "",
202 "Current number of shared memory segments allocated");
204 static struct sx sysvshmsx;
205 #define SYSVSHM_LOCK() sx_xlock(&sysvshmsx)
206 #define SYSVSHM_UNLOCK() sx_xunlock(&sysvshmsx)
207 #define SYSVSHM_ASSERT_LOCKED() sx_assert(&sysvshmsx, SA_XLOCKED)
210 shm_find_segment_by_key(struct prison *pr, key_t key)
214 for (i = 0; i < shmalloced; i++)
215 if ((shmsegs[i].u.shm_perm.mode & SHMSEG_ALLOCATED) &&
216 shmsegs[i].cred != NULL &&
217 shmsegs[i].cred->cr_prison == pr &&
218 shmsegs[i].u.shm_perm.key == key)
224 * Finds segment either by shmid if is_shmid is true, or by segnum if
227 static struct shmid_kernel *
228 shm_find_segment(struct prison *rpr, int arg, bool is_shmid)
230 struct shmid_kernel *shmseg;
233 segnum = is_shmid ? IPCID_TO_IX(arg) : arg;
234 if (segnum < 0 || segnum >= shmalloced)
236 shmseg = &shmsegs[segnum];
237 if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 ||
238 (!shm_allow_removed &&
239 (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) != 0) ||
240 (is_shmid && shmseg->u.shm_perm.seq != IPCID_TO_SEQ(arg)) ||
241 shm_prison_cansee(rpr, shmseg) != 0)
247 shm_deallocate_segment(struct shmid_kernel *shmseg)
251 SYSVSHM_ASSERT_LOCKED();
253 vm_object_deallocate(shmseg->object);
254 shmseg->object = NULL;
255 size = round_page(shmseg->u.shm_segsz);
256 shm_committed -= btoc(size);
258 shmseg->u.shm_perm.mode = SHMSEG_FREE;
260 mac_sysvshm_cleanup(shmseg);
262 racct_sub_cred(shmseg->cred, RACCT_NSHM, 1);
263 racct_sub_cred(shmseg->cred, RACCT_SHMSIZE, size);
264 crfree(shmseg->cred);
269 shm_delete_mapping(struct vmspace *vm, struct shmmap_state *shmmap_s)
271 struct shmid_kernel *shmseg;
275 SYSVSHM_ASSERT_LOCKED();
276 segnum = IPCID_TO_IX(shmmap_s->shmid);
277 KASSERT(segnum >= 0 && segnum < shmalloced,
278 ("segnum %d shmalloced %d", segnum, shmalloced));
280 shmseg = &shmsegs[segnum];
281 size = round_page(shmseg->u.shm_segsz);
282 result = vm_map_remove(&vm->vm_map, shmmap_s->va, shmmap_s->va + size);
283 if (result != KERN_SUCCESS)
285 shmmap_s->shmid = -1;
286 shmseg->u.shm_dtime = time_second;
287 if (--shmseg->u.shm_nattch == 0 &&
288 (shmseg->u.shm_perm.mode & SHMSEG_REMOVED)) {
289 shm_deallocate_segment(shmseg);
290 shm_last_free = segnum;
296 shm_remove(struct shmid_kernel *shmseg, int segnum)
299 shmseg->u.shm_perm.key = IPC_PRIVATE;
300 shmseg->u.shm_perm.mode |= SHMSEG_REMOVED;
301 if (shmseg->u.shm_nattch == 0) {
302 shm_deallocate_segment(shmseg);
303 shm_last_free = segnum;
307 static struct prison *
308 shm_find_prison(struct ucred *cred)
310 struct prison *pr, *rpr;
312 pr = cred->cr_prison;
314 rpr = osd_jail_get(pr, shm_prison_slot);
320 shm_prison_cansee(struct prison *rpr, struct shmid_kernel *shmseg)
323 if (shmseg->cred == NULL ||
324 !(rpr == shmseg->cred->cr_prison ||
325 prison_ischild(rpr, shmseg->cred->cr_prison)))
331 kern_shmdt_locked(struct thread *td, const void *shmaddr)
333 struct proc *p = td->td_proc;
334 struct shmmap_state *shmmap_s;
335 #if defined(AUDIT) || defined(MAC)
336 struct shmid_kernel *shmsegptr;
343 SYSVSHM_ASSERT_LOCKED();
344 if (shm_find_prison(td->td_ucred) == NULL)
346 shmmap_s = p->p_vmspace->vm_shm;
347 if (shmmap_s == NULL)
349 AUDIT_ARG_SVIPC_ID(shmmap_s->shmid);
350 for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) {
351 if (shmmap_s->shmid != -1 &&
352 shmmap_s->va == (vm_offset_t)shmaddr) {
356 if (i == shminfo.shmseg)
358 #if (defined(AUDIT) && defined(KDTRACE_HOOKS)) || defined(MAC)
359 shmsegptr = &shmsegs[IPCID_TO_IX(shmmap_s->shmid)];
362 error = mac_sysvshm_check_shmdt(td->td_ucred, shmsegptr);
366 return (shm_delete_mapping(p->p_vmspace, shmmap_s));
369 #ifndef _SYS_SYSPROTO_H_
375 sys_shmdt(struct thread *td, struct shmdt_args *uap)
380 error = kern_shmdt_locked(td, uap->shmaddr);
386 kern_shmat_locked(struct thread *td, int shmid, const void *shmaddr,
390 struct proc *p = td->td_proc;
391 struct shmid_kernel *shmseg;
392 struct shmmap_state *shmmap_s;
393 vm_offset_t attach_va;
398 AUDIT_ARG_SVIPC_ID(shmid);
399 AUDIT_ARG_VALUE(shmflg);
401 SYSVSHM_ASSERT_LOCKED();
402 rpr = shm_find_prison(td->td_ucred);
405 shmmap_s = p->p_vmspace->vm_shm;
406 if (shmmap_s == NULL) {
407 shmmap_s = malloc(shminfo.shmseg * sizeof(struct shmmap_state),
409 for (i = 0; i < shminfo.shmseg; i++)
410 shmmap_s[i].shmid = -1;
411 KASSERT(p->p_vmspace->vm_shm == NULL, ("raced"));
412 p->p_vmspace->vm_shm = shmmap_s;
414 shmseg = shm_find_segment(rpr, shmid, true);
417 error = ipcperm(td, &shmseg->u.shm_perm,
418 (shmflg & SHM_RDONLY) ? IPC_R : IPC_R|IPC_W);
422 error = mac_sysvshm_check_shmat(td->td_ucred, shmseg, shmflg);
426 for (i = 0; i < shminfo.shmseg; i++) {
427 if (shmmap_s->shmid == -1)
431 if (i >= shminfo.shmseg)
433 size = round_page(shmseg->u.shm_segsz);
435 if ((shmflg & SHM_RDONLY) == 0)
436 prot |= VM_PROT_WRITE;
437 if (shmaddr != NULL) {
438 if ((shmflg & SHM_RND) != 0)
439 attach_va = rounddown2((vm_offset_t)shmaddr, SHMLBA);
440 else if (((vm_offset_t)shmaddr & (SHMLBA-1)) == 0)
441 attach_va = (vm_offset_t)shmaddr;
446 * This is just a hint to vm_map_find() about where to
449 attach_va = round_page((vm_offset_t)p->p_vmspace->vm_daddr +
450 lim_max(td, RLIMIT_DATA));
453 vm_object_reference(shmseg->object);
454 rv = vm_map_find(&p->p_vmspace->vm_map, shmseg->object, 0, &attach_va,
455 size, 0, shmaddr != NULL ? VMFS_NO_SPACE : VMFS_OPTIMAL_SPACE,
456 prot, prot, MAP_INHERIT_SHARE | MAP_PREFAULT_PARTIAL);
457 if (rv != KERN_SUCCESS) {
458 vm_object_deallocate(shmseg->object);
462 shmmap_s->va = attach_va;
463 shmmap_s->shmid = shmid;
464 shmseg->u.shm_lpid = p->p_pid;
465 shmseg->u.shm_atime = time_second;
466 shmseg->u.shm_nattch++;
467 td->td_retval[0] = attach_va;
472 kern_shmat(struct thread *td, int shmid, const void *shmaddr, int shmflg)
477 error = kern_shmat_locked(td, shmid, shmaddr, shmflg);
482 #ifndef _SYS_SYSPROTO_H_
490 sys_shmat(struct thread *td, struct shmat_args *uap)
493 return (kern_shmat(td, uap->shmid, uap->shmaddr, uap->shmflg));
497 kern_shmctl_locked(struct thread *td, int shmid, int cmd, void *buf,
501 struct shmid_kernel *shmseg;
502 struct shmid_ds *shmidp;
503 struct shm_info shm_info;
506 SYSVSHM_ASSERT_LOCKED();
508 rpr = shm_find_prison(td->td_ucred);
512 AUDIT_ARG_SVIPC_ID(shmid);
513 AUDIT_ARG_SVIPC_CMD(cmd);
517 * It is possible that kern_shmctl is being called from the Linux ABI
518 * layer, in which case, we will need to implement IPC_INFO. It should
519 * be noted that other shmctl calls will be funneled through here for
520 * Linix binaries as well.
522 * NB: The Linux ABI layer will convert this data to structure(s) more
523 * consistent with the Linux ABI.
526 memcpy(buf, &shminfo, sizeof(shminfo));
528 *bufsz = sizeof(shminfo);
529 td->td_retval[0] = shmalloced;
532 shm_info.used_ids = shm_nused;
533 shm_info.shm_rss = 0; /*XXX where to get from ? */
534 shm_info.shm_tot = 0; /*XXX where to get from ? */
535 shm_info.shm_swp = 0; /*XXX where to get from ? */
536 shm_info.swap_attempts = 0; /*XXX where to get from ? */
537 shm_info.swap_successes = 0; /*XXX where to get from ? */
538 memcpy(buf, &shm_info, sizeof(shm_info));
540 *bufsz = sizeof(shm_info);
541 td->td_retval[0] = shmalloced;
545 shmseg = shm_find_segment(rpr, shmid, cmd != SHM_STAT);
549 error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, cmd);
556 shmidp = (struct shmid_ds *)buf;
557 error = ipcperm(td, &shmseg->u.shm_perm, IPC_R);
560 memcpy(shmidp, &shmseg->u, sizeof(struct shmid_ds));
561 if (td->td_ucred->cr_prison != shmseg->cred->cr_prison)
562 shmidp->shm_perm.key = IPC_PRIVATE;
564 *bufsz = sizeof(struct shmid_ds);
565 if (cmd == SHM_STAT) {
566 td->td_retval[0] = IXSEQ_TO_IPCID(shmid,
571 shmidp = (struct shmid_ds *)buf;
572 AUDIT_ARG_SVIPC_PERM(&shmidp->shm_perm);
573 error = ipcperm(td, &shmseg->u.shm_perm, IPC_M);
576 shmseg->u.shm_perm.uid = shmidp->shm_perm.uid;
577 shmseg->u.shm_perm.gid = shmidp->shm_perm.gid;
578 shmseg->u.shm_perm.mode =
579 (shmseg->u.shm_perm.mode & ~ACCESSPERMS) |
580 (shmidp->shm_perm.mode & ACCESSPERMS);
581 shmseg->u.shm_ctime = time_second;
584 error = ipcperm(td, &shmseg->u.shm_perm, IPC_M);
587 shm_remove(shmseg, IPCID_TO_IX(shmid));
601 kern_shmctl(struct thread *td, int shmid, int cmd, void *buf, size_t *bufsz)
606 error = kern_shmctl_locked(td, shmid, cmd, buf, bufsz);
612 #ifndef _SYS_SYSPROTO_H_
616 struct shmid_ds *buf;
620 sys_shmctl(struct thread *td, struct shmctl_args *uap)
627 * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support
628 * Linux binaries. If we see the call come through the FreeBSD ABI,
629 * return an error back to the user since we do not to support this.
631 if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO ||
632 uap->cmd == SHM_STAT)
635 /* IPC_SET needs to copyin the buffer before calling kern_shmctl */
636 if (uap->cmd == IPC_SET) {
637 if ((error = copyin(uap->buf, &buf, sizeof(struct shmid_ds))))
641 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz);
645 /* Cases in which we need to copyout */
648 error = copyout(&buf, uap->buf, bufsz);
654 /* Invalidate the return value */
655 td->td_retval[0] = -1;
662 shmget_existing(struct thread *td, struct shmget_args *uap, int mode,
665 struct shmid_kernel *shmseg;
670 SYSVSHM_ASSERT_LOCKED();
671 KASSERT(segnum >= 0 && segnum < shmalloced,
672 ("segnum %d shmalloced %d", segnum, shmalloced));
673 shmseg = &shmsegs[segnum];
674 if ((uap->shmflg & (IPC_CREAT | IPC_EXCL)) == (IPC_CREAT | IPC_EXCL))
677 error = mac_sysvshm_check_shmget(td->td_ucred, shmseg, uap->shmflg);
681 if (uap->size != 0 && uap->size > shmseg->u.shm_segsz)
683 td->td_retval[0] = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm);
688 shmget_allocate_segment(struct thread *td, struct shmget_args *uap, int mode)
690 struct ucred *cred = td->td_ucred;
691 struct shmid_kernel *shmseg;
692 vm_object_t shm_object;
696 SYSVSHM_ASSERT_LOCKED();
698 if (uap->size < shminfo.shmmin || uap->size > shminfo.shmmax)
700 if (shm_nused >= shminfo.shmmni) /* Any shmids left? */
702 size = round_page(uap->size);
703 if (shm_committed + btoc(size) > shminfo.shmall)
705 if (shm_last_free < 0) {
706 shmrealloc(); /* Maybe expand the shmsegs[] array. */
707 for (i = 0; i < shmalloced; i++)
708 if (shmsegs[i].u.shm_perm.mode & SHMSEG_FREE)
714 segnum = shm_last_free;
717 KASSERT(segnum >= 0 && segnum < shmalloced,
718 ("segnum %d shmalloced %d", segnum, shmalloced));
719 shmseg = &shmsegs[segnum];
722 PROC_LOCK(td->td_proc);
723 if (racct_add(td->td_proc, RACCT_NSHM, 1)) {
724 PROC_UNLOCK(td->td_proc);
727 if (racct_add(td->td_proc, RACCT_SHMSIZE, size)) {
728 racct_sub(td->td_proc, RACCT_NSHM, 1);
729 PROC_UNLOCK(td->td_proc);
732 PROC_UNLOCK(td->td_proc);
737 * We make sure that we have allocated a pager before we need
740 shm_object = vm_pager_allocate(shm_use_phys ? OBJT_PHYS : OBJT_SWAP,
741 0, size, VM_PROT_DEFAULT, 0, cred);
742 if (shm_object == NULL) {
745 PROC_LOCK(td->td_proc);
746 racct_sub(td->td_proc, RACCT_NSHM, 1);
747 racct_sub(td->td_proc, RACCT_SHMSIZE, size);
748 PROC_UNLOCK(td->td_proc);
753 shm_object->pg_color = 0;
754 VM_OBJECT_WLOCK(shm_object);
755 vm_object_clear_flag(shm_object, OBJ_ONEMAPPING);
756 vm_object_set_flag(shm_object, OBJ_COLORED | OBJ_NOSPLIT);
757 VM_OBJECT_WUNLOCK(shm_object);
759 shmseg->object = shm_object;
760 shmseg->u.shm_perm.cuid = shmseg->u.shm_perm.uid = cred->cr_uid;
761 shmseg->u.shm_perm.cgid = shmseg->u.shm_perm.gid = cred->cr_gid;
762 shmseg->u.shm_perm.mode = (mode & ACCESSPERMS) | SHMSEG_ALLOCATED;
763 shmseg->u.shm_perm.key = uap->key;
764 shmseg->u.shm_perm.seq = (shmseg->u.shm_perm.seq + 1) & 0x7fff;
765 shmseg->cred = crhold(cred);
766 shmseg->u.shm_segsz = uap->size;
767 shmseg->u.shm_cpid = td->td_proc->p_pid;
768 shmseg->u.shm_lpid = shmseg->u.shm_nattch = 0;
769 shmseg->u.shm_atime = shmseg->u.shm_dtime = 0;
771 mac_sysvshm_create(cred, shmseg);
773 shmseg->u.shm_ctime = time_second;
774 shm_committed += btoc(size);
776 td->td_retval[0] = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm);
781 #ifndef _SYS_SYSPROTO_H_
789 sys_shmget(struct thread *td, struct shmget_args *uap)
794 if (shm_find_prison(td->td_ucred) == NULL)
796 mode = uap->shmflg & ACCESSPERMS;
798 if (uap->key == IPC_PRIVATE) {
799 error = shmget_allocate_segment(td, uap, mode);
801 segnum = shm_find_segment_by_key(td->td_ucred->cr_prison,
804 error = shmget_existing(td, uap, mode, segnum);
805 else if ((uap->shmflg & IPC_CREAT) == 0)
808 error = shmget_allocate_segment(td, uap, mode);
815 shmfork_myhook(struct proc *p1, struct proc *p2)
817 struct shmmap_state *shmmap_s;
822 size = shminfo.shmseg * sizeof(struct shmmap_state);
823 shmmap_s = malloc(size, M_SHM, M_WAITOK);
824 bcopy(p1->p_vmspace->vm_shm, shmmap_s, size);
825 p2->p_vmspace->vm_shm = shmmap_s;
826 for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) {
827 if (shmmap_s->shmid != -1) {
828 KASSERT(IPCID_TO_IX(shmmap_s->shmid) >= 0 &&
829 IPCID_TO_IX(shmmap_s->shmid) < shmalloced,
830 ("segnum %d shmalloced %d",
831 IPCID_TO_IX(shmmap_s->shmid), shmalloced));
832 shmsegs[IPCID_TO_IX(shmmap_s->shmid)].u.shm_nattch++;
839 shmexit_myhook(struct vmspace *vm)
841 struct shmmap_state *base, *shm;
848 for (i = 0, shm = base; i < shminfo.shmseg; i++, shm++) {
849 if (shm->shmid != -1)
850 shm_delete_mapping(vm, shm);
860 struct shmid_kernel *newsegs;
863 SYSVSHM_ASSERT_LOCKED();
865 if (shmalloced >= shminfo.shmmni)
868 newsegs = malloc(shminfo.shmmni * sizeof(*newsegs), M_SHM, M_WAITOK);
869 for (i = 0; i < shmalloced; i++)
870 bcopy(&shmsegs[i], &newsegs[i], sizeof(newsegs[0]));
871 for (; i < shminfo.shmmni; i++) {
872 newsegs[i].u.shm_perm.mode = SHMSEG_FREE;
873 newsegs[i].u.shm_perm.seq = 0;
875 mac_sysvshm_init(&newsegs[i]);
878 free(shmsegs, M_SHM);
880 shmalloced = shminfo.shmmni;
883 static struct syscall_helper_data shm_syscalls[] = {
884 SYSCALL_INIT_HELPER(shmat),
885 SYSCALL_INIT_HELPER(shmctl),
886 SYSCALL_INIT_HELPER(shmdt),
887 SYSCALL_INIT_HELPER(shmget),
888 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
889 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
890 SYSCALL_INIT_HELPER_COMPAT(freebsd7_shmctl),
892 #if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43))
893 SYSCALL_INIT_HELPER(shmsys),
898 #ifdef COMPAT_FREEBSD32
899 #include <compat/freebsd32/freebsd32.h>
900 #include <compat/freebsd32/freebsd32_ipc.h>
901 #include <compat/freebsd32/freebsd32_proto.h>
902 #include <compat/freebsd32/freebsd32_signal.h>
903 #include <compat/freebsd32/freebsd32_syscall.h>
904 #include <compat/freebsd32/freebsd32_util.h>
906 static struct syscall_helper_data shm32_syscalls[] = {
907 SYSCALL32_INIT_HELPER_COMPAT(shmat),
908 SYSCALL32_INIT_HELPER_COMPAT(shmdt),
909 SYSCALL32_INIT_HELPER_COMPAT(shmget),
910 SYSCALL32_INIT_HELPER(freebsd32_shmsys),
911 SYSCALL32_INIT_HELPER(freebsd32_shmctl),
912 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
913 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
914 SYSCALL32_INIT_HELPER(freebsd7_freebsd32_shmctl),
926 osd_method_t methods[PR_MAXMETHOD] = {
927 [PR_METHOD_CHECK] = shm_prison_check,
928 [PR_METHOD_SET] = shm_prison_set,
929 [PR_METHOD_GET] = shm_prison_get,
930 [PR_METHOD_REMOVE] = shm_prison_remove,
934 if (TUNABLE_ULONG_FETCH("kern.ipc.shmmaxpgs", &shminfo.shmall) != 0)
935 printf("kern.ipc.shmmaxpgs is now called kern.ipc.shmall!\n");
937 if (shminfo.shmmax == SHMMAX) {
938 /* Initialize shmmax dealing with possible overflow. */
939 for (i = PAGE_SIZE; i != 0; i--) {
940 shminfo.shmmax = shminfo.shmall * i;
941 if ((shminfo.shmmax / shminfo.shmall) == (u_long)i)
945 shmalloced = shminfo.shmmni;
946 shmsegs = malloc(shmalloced * sizeof(shmsegs[0]), M_SHM, M_WAITOK);
947 for (i = 0; i < shmalloced; i++) {
948 shmsegs[i].u.shm_perm.mode = SHMSEG_FREE;
949 shmsegs[i].u.shm_perm.seq = 0;
951 mac_sysvshm_init(&shmsegs[i]);
957 sx_init(&sysvshmsx, "sysvshmsx");
958 shmexit_hook = &shmexit_myhook;
959 shmfork_hook = &shmfork_myhook;
961 /* Set current prisons according to their allow.sysvipc. */
962 shm_prison_slot = osd_jail_register(NULL, methods);
963 rsv = osd_reserve(shm_prison_slot);
964 prison_lock(&prison0);
965 (void)osd_jail_set_reserved(&prison0, shm_prison_slot, rsv, &prison0);
966 prison_unlock(&prison0);
968 sx_slock(&allprison_lock);
969 TAILQ_FOREACH(pr, &allprison, pr_list) {
971 rsv = osd_reserve(shm_prison_slot);
973 if ((pr->pr_allow & PR_ALLOW_SYSVIPC) && pr->pr_ref > 0) {
974 (void)osd_jail_set_reserved(pr, shm_prison_slot, rsv,
981 osd_free_reserved(rsv);
982 sx_sunlock(&allprison_lock);
984 error = syscall_helper_register(shm_syscalls, SY_THR_STATIC_KLD);
987 #ifdef COMPAT_FREEBSD32
988 error = syscall32_helper_register(shm32_syscalls, SY_THR_STATIC_KLD);
1003 #ifdef COMPAT_FREEBSD32
1004 syscall32_helper_unregister(shm32_syscalls);
1006 syscall_helper_unregister(shm_syscalls);
1007 if (shm_prison_slot != 0)
1008 osd_jail_deregister(shm_prison_slot);
1010 for (i = 0; i < shmalloced; i++) {
1012 mac_sysvshm_destroy(&shmsegs[i]);
1015 * Objects might be still mapped into the processes
1016 * address spaces. Actual free would happen on the
1017 * last mapping destruction.
1019 if (shmsegs[i].u.shm_perm.mode != SHMSEG_FREE)
1020 vm_object_deallocate(shmsegs[i].object);
1022 free(shmsegs, M_SHM);
1023 shmexit_hook = NULL;
1024 shmfork_hook = NULL;
1025 sx_destroy(&sysvshmsx);
1030 sysctl_shmsegs(SYSCTL_HANDLER_ARGS)
1032 struct shmid_kernel tshmseg;
1033 struct prison *pr, *rpr;
1037 pr = req->td->td_ucred->cr_prison;
1038 rpr = shm_find_prison(req->td->td_ucred);
1040 for (i = 0; i < shmalloced; i++) {
1041 if ((shmsegs[i].u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 ||
1042 rpr == NULL || shm_prison_cansee(rpr, &shmsegs[i]) != 0) {
1043 bzero(&tshmseg, sizeof(tshmseg));
1044 tshmseg.u.shm_perm.mode = SHMSEG_FREE;
1046 tshmseg = shmsegs[i];
1047 if (tshmseg.cred->cr_prison != pr)
1048 tshmseg.u.shm_perm.key = IPC_PRIVATE;
1050 error = SYSCTL_OUT(req, &tshmseg, sizeof(tshmseg));
1059 shm_prison_check(void *obj, void *data)
1061 struct prison *pr = obj;
1062 struct prison *prpr;
1063 struct vfsoptlist *opts = data;
1067 * sysvshm is a jailsys integer.
1068 * It must be "disable" if the parent jail is disabled.
1070 error = vfs_copyopt(opts, "sysvshm", &jsys, sizeof(jsys));
1071 if (error != ENOENT) {
1075 case JAIL_SYS_DISABLE:
1078 case JAIL_SYS_INHERIT:
1079 prison_lock(pr->pr_parent);
1080 prpr = osd_jail_get(pr->pr_parent, shm_prison_slot);
1081 prison_unlock(pr->pr_parent);
1094 shm_prison_set(void *obj, void *data)
1096 struct prison *pr = obj;
1097 struct prison *tpr, *orpr, *nrpr, *trpr;
1098 struct vfsoptlist *opts = data;
1103 * sysvshm controls which jail is the root of the associated segments
1104 * (this jail or same as the parent), or if the feature is available
1107 if (vfs_copyopt(opts, "sysvshm", &jsys, sizeof(jsys)) == ENOENT)
1108 jsys = vfs_flagopt(opts, "allow.sysvipc", NULL, 0)
1110 : vfs_flagopt(opts, "allow.nosysvipc", NULL, 0)
1113 if (jsys == JAIL_SYS_DISABLE) {
1115 orpr = osd_jail_get(pr, shm_prison_slot);
1117 osd_jail_del(pr, shm_prison_slot);
1121 shm_prison_cleanup(pr);
1122 /* Disable all child jails as well. */
1123 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1125 trpr = osd_jail_get(tpr, shm_prison_slot);
1127 osd_jail_del(tpr, shm_prison_slot);
1130 shm_prison_cleanup(tpr);
1137 } else if (jsys != -1) {
1138 if (jsys == JAIL_SYS_NEW)
1141 prison_lock(pr->pr_parent);
1142 nrpr = osd_jail_get(pr->pr_parent, shm_prison_slot);
1143 prison_unlock(pr->pr_parent);
1145 rsv = osd_reserve(shm_prison_slot);
1147 orpr = osd_jail_get(pr, shm_prison_slot);
1149 (void)osd_jail_set_reserved(pr, shm_prison_slot, rsv,
1152 osd_free_reserved(rsv);
1156 shm_prison_cleanup(pr);
1158 /* Change child jails matching the old root, */
1159 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1161 trpr = osd_jail_get(tpr,
1164 (void)osd_jail_set(tpr,
1165 shm_prison_slot, nrpr);
1168 shm_prison_cleanup(tpr);
1182 shm_prison_get(void *obj, void *data)
1184 struct prison *pr = obj;
1186 struct vfsoptlist *opts = data;
1189 /* Set sysvshm based on the jail's root prison. */
1191 rpr = osd_jail_get(pr, shm_prison_slot);
1193 jsys = rpr == NULL ? JAIL_SYS_DISABLE
1194 : rpr == pr ? JAIL_SYS_NEW : JAIL_SYS_INHERIT;
1195 error = vfs_setopt(opts, "sysvshm", &jsys, sizeof(jsys));
1196 if (error == ENOENT)
1202 shm_prison_remove(void *obj, void *data __unused)
1204 struct prison *pr = obj;
1209 rpr = osd_jail_get(pr, shm_prison_slot);
1212 shm_prison_cleanup(pr);
1218 shm_prison_cleanup(struct prison *pr)
1220 struct shmid_kernel *shmseg;
1223 /* Remove any segments that belong to this jail. */
1224 for (i = 0; i < shmalloced; i++) {
1225 shmseg = &shmsegs[i];
1226 if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) &&
1227 shmseg->cred != NULL && shmseg->cred->cr_prison == pr) {
1228 shm_remove(shmseg, i);
1233 SYSCTL_JAIL_PARAM_SYS_NODE(sysvshm, CTLFLAG_RW, "SYSV shared memory");
1235 #if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43))
1237 struct ipc_perm_old shm_perm; /* operation perms */
1238 int shm_segsz; /* size of segment (bytes) */
1239 u_short shm_cpid; /* pid, creator */
1240 u_short shm_lpid; /* pid, last operation */
1241 short shm_nattch; /* no. of current attaches */
1242 time_t shm_atime; /* last attach time */
1243 time_t shm_dtime; /* last detach time */
1244 time_t shm_ctime; /* last change time */
1245 void *shm_handle; /* internal handle for shm segment */
1248 struct oshmctl_args {
1251 struct oshmid_ds *ubuf;
1255 oshmctl(struct thread *td, struct oshmctl_args *uap)
1260 struct shmid_kernel *shmseg;
1261 struct oshmid_ds outbuf;
1263 rpr = shm_find_prison(td->td_ucred);
1266 if (uap->cmd != IPC_STAT) {
1267 return (freebsd7_shmctl(td,
1268 (struct freebsd7_shmctl_args *)uap));
1271 shmseg = shm_find_segment(rpr, uap->shmid, true);
1272 if (shmseg == NULL) {
1276 error = ipcperm(td, &shmseg->u.shm_perm, IPC_R);
1282 error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, uap->cmd);
1288 ipcperm_new2old(&shmseg->u.shm_perm, &outbuf.shm_perm);
1289 outbuf.shm_segsz = shmseg->u.shm_segsz;
1290 outbuf.shm_cpid = shmseg->u.shm_cpid;
1291 outbuf.shm_lpid = shmseg->u.shm_lpid;
1292 outbuf.shm_nattch = shmseg->u.shm_nattch;
1293 outbuf.shm_atime = shmseg->u.shm_atime;
1294 outbuf.shm_dtime = shmseg->u.shm_dtime;
1295 outbuf.shm_ctime = shmseg->u.shm_ctime;
1296 outbuf.shm_handle = shmseg->object;
1298 return (copyout(&outbuf, uap->ubuf, sizeof(outbuf)));
1304 /* XXX casting to (sy_call_t *) is bogus, as usual. */
1305 static sy_call_t *shmcalls[] = {
1306 (sy_call_t *)sys_shmat, (sy_call_t *)oshmctl,
1307 (sy_call_t *)sys_shmdt, (sy_call_t *)sys_shmget,
1308 (sy_call_t *)freebsd7_shmctl
1311 #ifndef _SYS_SYSPROTO_H_
1312 /* XXX actually varargs. */
1313 struct shmsys_args {
1321 sys_shmsys(struct thread *td, struct shmsys_args *uap)
1324 AUDIT_ARG_SVIPC_WHICH(uap->which);
1325 if (uap->which < 0 || uap->which >= nitems(shmcalls))
1327 return ((*shmcalls[uap->which])(td, &uap->a2));
1330 #endif /* i386 && (COMPAT_FREEBSD4 || COMPAT_43) */
1332 #ifdef COMPAT_FREEBSD32
1335 freebsd32_shmsys(struct thread *td, struct freebsd32_shmsys_args *uap)
1338 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1339 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1340 AUDIT_ARG_SVIPC_WHICH(uap->which);
1341 switch (uap->which) {
1342 case 0: { /* shmat */
1343 struct shmat_args ap;
1346 ap.shmaddr = PTRIN(uap->a3);
1347 ap.shmflg = uap->a4;
1348 return (sysent[SYS_shmat].sy_call(td, &ap));
1350 case 2: { /* shmdt */
1351 struct shmdt_args ap;
1353 ap.shmaddr = PTRIN(uap->a2);
1354 return (sysent[SYS_shmdt].sy_call(td, &ap));
1356 case 3: { /* shmget */
1357 struct shmget_args ap;
1361 ap.shmflg = uap->a4;
1362 return (sysent[SYS_shmget].sy_call(td, &ap));
1364 case 4: { /* shmctl */
1365 struct freebsd7_freebsd32_shmctl_args ap;
1369 ap.buf = PTRIN(uap->a4);
1370 return (freebsd7_freebsd32_shmctl(td, &ap));
1372 case 1: /* oshmctl */
1377 return (nosys(td, NULL));
1381 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1382 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1384 freebsd7_freebsd32_shmctl(struct thread *td,
1385 struct freebsd7_freebsd32_shmctl_args *uap)
1389 struct shmid_ds shmid_ds;
1390 struct shm_info shm_info;
1391 struct shminfo shminfo;
1394 struct shmid_ds32_old shmid_ds32;
1395 struct shm_info32 shm_info32;
1396 struct shminfo32 shminfo32;
1400 if (uap->cmd == IPC_SET) {
1401 if ((error = copyin(uap->buf, &u32.shmid_ds32,
1402 sizeof(u32.shmid_ds32))))
1404 freebsd32_ipcperm_old_in(&u32.shmid_ds32.shm_perm,
1405 &u.shmid_ds.shm_perm);
1406 CP(u32.shmid_ds32, u.shmid_ds, shm_segsz);
1407 CP(u32.shmid_ds32, u.shmid_ds, shm_lpid);
1408 CP(u32.shmid_ds32, u.shmid_ds, shm_cpid);
1409 CP(u32.shmid_ds32, u.shmid_ds, shm_nattch);
1410 CP(u32.shmid_ds32, u.shmid_ds, shm_atime);
1411 CP(u32.shmid_ds32, u.shmid_ds, shm_dtime);
1412 CP(u32.shmid_ds32, u.shmid_ds, shm_ctime);
1415 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz);
1419 /* Cases in which we need to copyout */
1422 CP(u.shminfo, u32.shminfo32, shmmax);
1423 CP(u.shminfo, u32.shminfo32, shmmin);
1424 CP(u.shminfo, u32.shminfo32, shmmni);
1425 CP(u.shminfo, u32.shminfo32, shmseg);
1426 CP(u.shminfo, u32.shminfo32, shmall);
1427 error = copyout(&u32.shminfo32, uap->buf,
1428 sizeof(u32.shminfo32));
1431 CP(u.shm_info, u32.shm_info32, used_ids);
1432 CP(u.shm_info, u32.shm_info32, shm_rss);
1433 CP(u.shm_info, u32.shm_info32, shm_tot);
1434 CP(u.shm_info, u32.shm_info32, shm_swp);
1435 CP(u.shm_info, u32.shm_info32, swap_attempts);
1436 CP(u.shm_info, u32.shm_info32, swap_successes);
1437 error = copyout(&u32.shm_info32, uap->buf,
1438 sizeof(u32.shm_info32));
1442 freebsd32_ipcperm_old_out(&u.shmid_ds.shm_perm,
1443 &u32.shmid_ds32.shm_perm);
1444 if (u.shmid_ds.shm_segsz > INT32_MAX)
1445 u32.shmid_ds32.shm_segsz = INT32_MAX;
1447 CP(u.shmid_ds, u32.shmid_ds32, shm_segsz);
1448 CP(u.shmid_ds, u32.shmid_ds32, shm_lpid);
1449 CP(u.shmid_ds, u32.shmid_ds32, shm_cpid);
1450 CP(u.shmid_ds, u32.shmid_ds32, shm_nattch);
1451 CP(u.shmid_ds, u32.shmid_ds32, shm_atime);
1452 CP(u.shmid_ds, u32.shmid_ds32, shm_dtime);
1453 CP(u.shmid_ds, u32.shmid_ds32, shm_ctime);
1454 u32.shmid_ds32.shm_internal = 0;
1455 error = copyout(&u32.shmid_ds32, uap->buf,
1456 sizeof(u32.shmid_ds32));
1462 /* Invalidate the return value */
1463 td->td_retval[0] = -1;
1470 freebsd32_shmctl(struct thread *td, struct freebsd32_shmctl_args *uap)
1474 struct shmid_ds shmid_ds;
1475 struct shm_info shm_info;
1476 struct shminfo shminfo;
1479 struct shmid_ds32 shmid_ds32;
1480 struct shm_info32 shm_info32;
1481 struct shminfo32 shminfo32;
1485 if (uap->cmd == IPC_SET) {
1486 if ((error = copyin(uap->buf, &u32.shmid_ds32,
1487 sizeof(u32.shmid_ds32))))
1489 freebsd32_ipcperm_in(&u32.shmid_ds32.shm_perm,
1490 &u.shmid_ds.shm_perm);
1491 CP(u32.shmid_ds32, u.shmid_ds, shm_segsz);
1492 CP(u32.shmid_ds32, u.shmid_ds, shm_lpid);
1493 CP(u32.shmid_ds32, u.shmid_ds, shm_cpid);
1494 CP(u32.shmid_ds32, u.shmid_ds, shm_nattch);
1495 CP(u32.shmid_ds32, u.shmid_ds, shm_atime);
1496 CP(u32.shmid_ds32, u.shmid_ds, shm_dtime);
1497 CP(u32.shmid_ds32, u.shmid_ds, shm_ctime);
1500 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz);
1504 /* Cases in which we need to copyout */
1507 CP(u.shminfo, u32.shminfo32, shmmax);
1508 CP(u.shminfo, u32.shminfo32, shmmin);
1509 CP(u.shminfo, u32.shminfo32, shmmni);
1510 CP(u.shminfo, u32.shminfo32, shmseg);
1511 CP(u.shminfo, u32.shminfo32, shmall);
1512 error = copyout(&u32.shminfo32, uap->buf,
1513 sizeof(u32.shminfo32));
1516 CP(u.shm_info, u32.shm_info32, used_ids);
1517 CP(u.shm_info, u32.shm_info32, shm_rss);
1518 CP(u.shm_info, u32.shm_info32, shm_tot);
1519 CP(u.shm_info, u32.shm_info32, shm_swp);
1520 CP(u.shm_info, u32.shm_info32, swap_attempts);
1521 CP(u.shm_info, u32.shm_info32, swap_successes);
1522 error = copyout(&u32.shm_info32, uap->buf,
1523 sizeof(u32.shm_info32));
1527 freebsd32_ipcperm_out(&u.shmid_ds.shm_perm,
1528 &u32.shmid_ds32.shm_perm);
1529 if (u.shmid_ds.shm_segsz > INT32_MAX)
1530 u32.shmid_ds32.shm_segsz = INT32_MAX;
1532 CP(u.shmid_ds, u32.shmid_ds32, shm_segsz);
1533 CP(u.shmid_ds, u32.shmid_ds32, shm_lpid);
1534 CP(u.shmid_ds, u32.shmid_ds32, shm_cpid);
1535 CP(u.shmid_ds, u32.shmid_ds32, shm_nattch);
1536 CP(u.shmid_ds, u32.shmid_ds32, shm_atime);
1537 CP(u.shmid_ds, u32.shmid_ds32, shm_dtime);
1538 CP(u.shmid_ds, u32.shmid_ds32, shm_ctime);
1539 error = copyout(&u32.shmid_ds32, uap->buf,
1540 sizeof(u32.shmid_ds32));
1546 /* Invalidate the return value */
1547 td->td_retval[0] = -1;
1553 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1554 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1557 #define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0)
1560 #ifndef _SYS_SYSPROTO_H_
1561 struct freebsd7_shmctl_args {
1564 struct shmid_ds_old *buf;
1568 freebsd7_shmctl(struct thread *td, struct freebsd7_shmctl_args *uap)
1571 struct shmid_ds_old old;
1572 struct shmid_ds buf;
1576 * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support
1577 * Linux binaries. If we see the call come through the FreeBSD ABI,
1578 * return an error back to the user since we do not to support this.
1580 if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO ||
1581 uap->cmd == SHM_STAT)
1584 /* IPC_SET needs to copyin the buffer before calling kern_shmctl */
1585 if (uap->cmd == IPC_SET) {
1586 if ((error = copyin(uap->buf, &old, sizeof(old))))
1588 ipcperm_old2new(&old.shm_perm, &buf.shm_perm);
1589 CP(old, buf, shm_segsz);
1590 CP(old, buf, shm_lpid);
1591 CP(old, buf, shm_cpid);
1592 CP(old, buf, shm_nattch);
1593 CP(old, buf, shm_atime);
1594 CP(old, buf, shm_dtime);
1595 CP(old, buf, shm_ctime);
1598 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz);
1602 /* Cases in which we need to copyout */
1605 ipcperm_new2old(&buf.shm_perm, &old.shm_perm);
1606 if (buf.shm_segsz > INT_MAX)
1607 old.shm_segsz = INT_MAX;
1609 CP(buf, old, shm_segsz);
1610 CP(buf, old, shm_lpid);
1611 CP(buf, old, shm_cpid);
1612 if (buf.shm_nattch > SHRT_MAX)
1613 old.shm_nattch = SHRT_MAX;
1615 CP(buf, old, shm_nattch);
1616 CP(buf, old, shm_atime);
1617 CP(buf, old, shm_dtime);
1618 CP(buf, old, shm_ctime);
1619 old.shm_internal = NULL;
1620 error = copyout(&old, uap->buf, sizeof(old));
1626 /* Invalidate the return value */
1627 td->td_retval[0] = -1;
1632 #endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 ||
1636 sysvshm_modload(struct module *module, int cmd, void *arg)
1647 error = shmunload();
1658 static moduledata_t sysvshm_mod = {
1664 DECLARE_MODULE(sysvshm, sysvshm_mod, SI_SUB_SYSV_SHM, SI_ORDER_FIRST);
1665 MODULE_VERSION(sysvshm, 1);