1 /* $NetBSD: sysv_shm.c,v 1.23 1994/07/04 23:25:12 glass Exp $ */
3 * Copyright (c) 1994 Adam Glass and Charles Hannum. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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
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.
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.
32 * Copyright (c) 2003-2005 McAfee, Inc.
33 * All rights reserved.
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
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
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.
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
62 #include <sys/cdefs.h>
63 __FBSDID("$FreeBSD$");
65 #include "opt_compat.h"
66 #include "opt_sysvipc.h"
68 #include <sys/param.h>
69 #include <sys/systm.h>
70 #include <sys/kernel.h>
71 #include <sys/limits.h>
73 #include <sys/sysctl.h>
76 #include <sys/malloc.h>
78 #include <sys/module.h>
79 #include <sys/mutex.h>
80 #include <sys/racct.h>
81 #include <sys/resourcevar.h>
83 #include <sys/syscall.h>
84 #include <sys/syscallsubr.h>
85 #include <sys/sysent.h>
86 #include <sys/sysproto.h>
89 #include <security/mac/mac_framework.h>
92 #include <vm/vm_param.h>
94 #include <vm/vm_object.h>
95 #include <vm/vm_map.h>
96 #include <vm/vm_page.h>
97 #include <vm/vm_pager.h>
99 FEATURE(sysv_shm, "System V shared memory segments support");
101 static MALLOC_DEFINE(M_SHM, "shm", "SVID compatible shared memory segments");
103 static int shmget_allocate_segment(struct thread *td,
104 struct shmget_args *uap, int mode);
105 static int shmget_existing(struct thread *td, struct shmget_args *uap,
106 int mode, int segnum);
108 #define SHMSEG_FREE 0x0200
109 #define SHMSEG_REMOVED 0x0400
110 #define SHMSEG_ALLOCATED 0x0800
111 #define SHMSEG_WANTED 0x1000
113 static int shm_last_free, shm_nused, shmalloced;
114 vm_size_t shm_committed;
115 static struct shmid_kernel *shmsegs;
117 struct shmmap_state {
122 static void shm_deallocate_segment(struct shmid_kernel *);
123 static int shm_find_segment_by_key(key_t);
124 static struct shmid_kernel *shm_find_segment_by_shmid(int);
125 static struct shmid_kernel *shm_find_segment_by_shmidx(int);
126 static int shm_delete_mapping(struct vmspace *vm, struct shmmap_state *);
127 static void shmrealloc(void);
128 static int shminit(void);
129 static int sysvshm_modload(struct module *, int, void *);
130 static int shmunload(void);
131 static void shmexit_myhook(struct vmspace *vm);
132 static void shmfork_myhook(struct proc *p1, struct proc *p2);
133 static int sysctl_shmsegs(SYSCTL_HANDLER_ARGS);
139 #define SHMMAXPGS 131072 /* Note: sysv shared memory is swap backed. */
142 #define SHMMAX (SHMMAXPGS*PAGE_SIZE)
154 #define SHMALL (SHMMAXPGS)
157 struct shminfo shminfo = {
165 static int shm_use_phys;
166 static int shm_allow_removed;
168 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmax, CTLFLAG_RW, &shminfo.shmmax, 0,
169 "Maximum shared memory segment size");
170 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmin, CTLFLAG_RW, &shminfo.shmmin, 0,
171 "Minimum shared memory segment size");
172 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmni, CTLFLAG_RDTUN, &shminfo.shmmni, 0,
173 "Number of shared memory identifiers");
174 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmseg, CTLFLAG_RDTUN, &shminfo.shmseg, 0,
175 "Number of segments per process");
176 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmall, CTLFLAG_RW, &shminfo.shmall, 0,
177 "Maximum number of pages available for shared memory");
178 SYSCTL_INT(_kern_ipc, OID_AUTO, shm_use_phys, CTLFLAG_RW,
179 &shm_use_phys, 0, "Enable/Disable locking of shared memory pages in core");
180 SYSCTL_INT(_kern_ipc, OID_AUTO, shm_allow_removed, CTLFLAG_RW,
181 &shm_allow_removed, 0,
182 "Enable/Disable attachment to attached segments marked for removal");
183 SYSCTL_PROC(_kern_ipc, OID_AUTO, shmsegs, CTLTYPE_OPAQUE | CTLFLAG_RD,
184 NULL, 0, sysctl_shmsegs, "",
185 "Current number of shared memory segments allocated");
188 shm_find_segment_by_key(key)
193 for (i = 0; i < shmalloced; i++)
194 if ((shmsegs[i].u.shm_perm.mode & SHMSEG_ALLOCATED) &&
195 shmsegs[i].u.shm_perm.key == key)
200 static struct shmid_kernel *
201 shm_find_segment_by_shmid(int shmid)
204 struct shmid_kernel *shmseg;
206 segnum = IPCID_TO_IX(shmid);
207 if (segnum < 0 || segnum >= shmalloced)
209 shmseg = &shmsegs[segnum];
210 if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 ||
211 (!shm_allow_removed &&
212 (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) != 0) ||
213 shmseg->u.shm_perm.seq != IPCID_TO_SEQ(shmid))
218 static struct shmid_kernel *
219 shm_find_segment_by_shmidx(int segnum)
221 struct shmid_kernel *shmseg;
223 if (segnum < 0 || segnum >= shmalloced)
225 shmseg = &shmsegs[segnum];
226 if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 ||
227 (!shm_allow_removed &&
228 (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) != 0))
234 shm_deallocate_segment(shmseg)
235 struct shmid_kernel *shmseg;
241 vm_object_deallocate(shmseg->object);
242 shmseg->object = NULL;
243 size = round_page(shmseg->u.shm_segsz);
244 shm_committed -= btoc(size);
246 shmseg->u.shm_perm.mode = SHMSEG_FREE;
248 mac_sysvshm_cleanup(shmseg);
250 racct_sub_cred(shmseg->cred, RACCT_NSHM, 1);
251 racct_sub_cred(shmseg->cred, RACCT_SHMSIZE, size);
252 crfree(shmseg->cred);
257 shm_delete_mapping(struct vmspace *vm, struct shmmap_state *shmmap_s)
259 struct shmid_kernel *shmseg;
265 segnum = IPCID_TO_IX(shmmap_s->shmid);
266 shmseg = &shmsegs[segnum];
267 size = round_page(shmseg->u.shm_segsz);
268 result = vm_map_remove(&vm->vm_map, shmmap_s->va, shmmap_s->va + size);
269 if (result != KERN_SUCCESS)
271 shmmap_s->shmid = -1;
272 shmseg->u.shm_dtime = time_second;
273 if ((--shmseg->u.shm_nattch <= 0) &&
274 (shmseg->u.shm_perm.mode & SHMSEG_REMOVED)) {
275 shm_deallocate_segment(shmseg);
276 shm_last_free = segnum;
281 #ifndef _SYS_SYSPROTO_H_
289 struct shmdt_args *uap;
291 struct proc *p = td->td_proc;
292 struct shmmap_state *shmmap_s;
294 struct shmid_kernel *shmsegptr;
299 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
302 shmmap_s = p->p_vmspace->vm_shm;
303 if (shmmap_s == NULL) {
307 for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) {
308 if (shmmap_s->shmid != -1 &&
309 shmmap_s->va == (vm_offset_t)uap->shmaddr) {
313 if (i == shminfo.shmseg) {
318 shmsegptr = &shmsegs[IPCID_TO_IX(shmmap_s->shmid)];
319 error = mac_sysvshm_check_shmdt(td->td_ucred, shmsegptr);
323 error = shm_delete_mapping(p->p_vmspace, shmmap_s);
329 #ifndef _SYS_SYSPROTO_H_
337 kern_shmat(td, shmid, shmaddr, shmflg)
343 struct proc *p = td->td_proc;
345 struct shmid_kernel *shmseg;
346 struct shmmap_state *shmmap_s = NULL;
347 vm_offset_t attach_va;
353 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
356 shmmap_s = p->p_vmspace->vm_shm;
357 if (shmmap_s == NULL) {
358 shmmap_s = malloc(shminfo.shmseg * sizeof(struct shmmap_state),
362 * If malloc() above sleeps, the Giant lock is
363 * temporarily dropped, which allows another thread to
364 * allocate shmmap_state and set vm_shm. Recheck
365 * vm_shm and free the new shmmap_state if another one
366 * is already allocated.
368 if (p->p_vmspace->vm_shm != NULL) {
369 free(shmmap_s, M_SHM);
370 shmmap_s = p->p_vmspace->vm_shm;
372 for (i = 0; i < shminfo.shmseg; i++)
373 shmmap_s[i].shmid = -1;
374 p->p_vmspace->vm_shm = shmmap_s;
377 shmseg = shm_find_segment_by_shmid(shmid);
378 if (shmseg == NULL) {
382 error = ipcperm(td, &shmseg->u.shm_perm,
383 (shmflg & SHM_RDONLY) ? IPC_R : IPC_R|IPC_W);
387 error = mac_sysvshm_check_shmat(td->td_ucred, shmseg, shmflg);
391 for (i = 0; i < shminfo.shmseg; i++) {
392 if (shmmap_s->shmid == -1)
396 if (i >= shminfo.shmseg) {
400 size = round_page(shmseg->u.shm_segsz);
402 if ((shmflg & SHM_RDONLY) == 0)
403 prot |= VM_PROT_WRITE;
404 flags = MAP_ANON | MAP_SHARED;
407 if (shmflg & SHM_RND) {
408 attach_va = (vm_offset_t)shmaddr & ~(SHMLBA-1);
409 } else if (((vm_offset_t)shmaddr & (SHMLBA-1)) == 0) {
410 attach_va = (vm_offset_t)shmaddr;
417 * This is just a hint to vm_map_find() about where to
421 attach_va = round_page((vm_offset_t)p->p_vmspace->vm_daddr +
422 lim_max(p, RLIMIT_DATA));
426 vm_object_reference(shmseg->object);
427 rv = vm_map_find(&p->p_vmspace->vm_map, shmseg->object,
428 0, &attach_va, size, (flags & MAP_FIXED) ? VMFS_NO_SPACE :
429 VMFS_OPTIMAL_SPACE, prot, prot, MAP_INHERIT_SHARE);
430 if (rv != KERN_SUCCESS) {
431 vm_object_deallocate(shmseg->object);
436 shmmap_s->va = attach_va;
437 shmmap_s->shmid = shmid;
438 shmseg->u.shm_lpid = p->p_pid;
439 shmseg->u.shm_atime = time_second;
440 shmseg->u.shm_nattch++;
441 td->td_retval[0] = attach_va;
450 struct shmat_args *uap;
452 return kern_shmat(td, uap->shmid, uap->shmaddr, uap->shmflg);
456 kern_shmctl(td, shmid, cmd, buf, bufsz)
464 struct shmid_kernel *shmseg;
466 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
472 * It is possible that kern_shmctl is being called from the Linux ABI
473 * layer, in which case, we will need to implement IPC_INFO. It should
474 * be noted that other shmctl calls will be funneled through here for
475 * Linix binaries as well.
477 * NB: The Linux ABI layer will convert this data to structure(s) more
478 * consistent with the Linux ABI.
481 memcpy(buf, &shminfo, sizeof(shminfo));
483 *bufsz = sizeof(shminfo);
484 td->td_retval[0] = shmalloced;
487 struct shm_info shm_info;
488 shm_info.used_ids = shm_nused;
489 shm_info.shm_rss = 0; /*XXX where to get from ? */
490 shm_info.shm_tot = 0; /*XXX where to get from ? */
491 shm_info.shm_swp = 0; /*XXX where to get from ? */
492 shm_info.swap_attempts = 0; /*XXX where to get from ? */
493 shm_info.swap_successes = 0; /*XXX where to get from ? */
494 memcpy(buf, &shm_info, sizeof(shm_info));
496 *bufsz = sizeof(shm_info);
497 td->td_retval[0] = shmalloced;
502 shmseg = shm_find_segment_by_shmidx(shmid);
504 shmseg = shm_find_segment_by_shmid(shmid);
505 if (shmseg == NULL) {
510 error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, cmd);
517 error = ipcperm(td, &shmseg->u.shm_perm, IPC_R);
520 memcpy(buf, &shmseg->u, sizeof(struct shmid_ds));
522 *bufsz = sizeof(struct shmid_ds);
524 td->td_retval[0] = IXSEQ_TO_IPCID(shmid, shmseg->u.shm_perm);
527 struct shmid_ds *shmid;
529 shmid = (struct shmid_ds *)buf;
530 error = ipcperm(td, &shmseg->u.shm_perm, IPC_M);
533 shmseg->u.shm_perm.uid = shmid->shm_perm.uid;
534 shmseg->u.shm_perm.gid = shmid->shm_perm.gid;
535 shmseg->u.shm_perm.mode =
536 (shmseg->u.shm_perm.mode & ~ACCESSPERMS) |
537 (shmid->shm_perm.mode & ACCESSPERMS);
538 shmseg->u.shm_ctime = time_second;
542 error = ipcperm(td, &shmseg->u.shm_perm, IPC_M);
545 shmseg->u.shm_perm.key = IPC_PRIVATE;
546 shmseg->u.shm_perm.mode |= SHMSEG_REMOVED;
547 if (shmseg->u.shm_nattch <= 0) {
548 shm_deallocate_segment(shmseg);
549 shm_last_free = IPCID_TO_IX(shmid);
565 #ifndef _SYS_SYSPROTO_H_
569 struct shmid_ds *buf;
575 struct shmctl_args *uap;
582 * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support
583 * Linux binaries. If we see the call come through the FreeBSD ABI,
584 * return an error back to the user since we do not to support this.
586 if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO ||
587 uap->cmd == SHM_STAT)
590 /* IPC_SET needs to copyin the buffer before calling kern_shmctl */
591 if (uap->cmd == IPC_SET) {
592 if ((error = copyin(uap->buf, &buf, sizeof(struct shmid_ds))))
596 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz);
600 /* Cases in which we need to copyout */
603 error = copyout(&buf, uap->buf, bufsz);
609 /* Invalidate the return value */
610 td->td_retval[0] = -1;
617 shmget_existing(td, uap, mode, segnum)
619 struct shmget_args *uap;
623 struct shmid_kernel *shmseg;
626 shmseg = &shmsegs[segnum];
627 if (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) {
629 * This segment is in the process of being allocated. Wait
630 * until it's done, and look the key up again (in case the
631 * allocation failed or it was freed).
633 shmseg->u.shm_perm.mode |= SHMSEG_WANTED;
634 error = tsleep(shmseg, PLOCK | PCATCH, "shmget", 0);
639 if ((uap->shmflg & (IPC_CREAT | IPC_EXCL)) == (IPC_CREAT | IPC_EXCL))
642 error = mac_sysvshm_check_shmget(td->td_ucred, shmseg, uap->shmflg);
646 if (uap->size != 0 && uap->size > shmseg->u.shm_segsz)
648 td->td_retval[0] = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm);
653 shmget_allocate_segment(td, uap, mode)
655 struct shmget_args *uap;
658 int i, segnum, shmid;
660 struct ucred *cred = td->td_ucred;
661 struct shmid_kernel *shmseg;
662 vm_object_t shm_object;
666 if (uap->size < shminfo.shmmin || uap->size > shminfo.shmmax)
668 if (shm_nused >= shminfo.shmmni) /* Any shmids left? */
670 size = round_page(uap->size);
671 if (shm_committed + btoc(size) > shminfo.shmall)
673 if (shm_last_free < 0) {
674 shmrealloc(); /* Maybe expand the shmsegs[] array. */
675 for (i = 0; i < shmalloced; i++)
676 if (shmsegs[i].u.shm_perm.mode & SHMSEG_FREE)
682 segnum = shm_last_free;
685 shmseg = &shmsegs[segnum];
687 PROC_LOCK(td->td_proc);
688 if (racct_add(td->td_proc, RACCT_NSHM, 1)) {
689 PROC_UNLOCK(td->td_proc);
692 if (racct_add(td->td_proc, RACCT_SHMSIZE, size)) {
693 racct_sub(td->td_proc, RACCT_NSHM, 1);
694 PROC_UNLOCK(td->td_proc);
697 PROC_UNLOCK(td->td_proc);
700 * In case we sleep in malloc(), mark the segment present but deleted
701 * so that noone else tries to create the same key.
703 shmseg->u.shm_perm.mode = SHMSEG_ALLOCATED | SHMSEG_REMOVED;
704 shmseg->u.shm_perm.key = uap->key;
705 shmseg->u.shm_perm.seq = (shmseg->u.shm_perm.seq + 1) & 0x7fff;
706 shmid = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm);
709 * We make sure that we have allocated a pager before we need
712 shm_object = vm_pager_allocate(shm_use_phys ? OBJT_PHYS : OBJT_SWAP,
713 0, size, VM_PROT_DEFAULT, 0, cred);
714 if (shm_object == NULL) {
716 PROC_LOCK(td->td_proc);
717 racct_sub(td->td_proc, RACCT_NSHM, 1);
718 racct_sub(td->td_proc, RACCT_SHMSIZE, size);
719 PROC_UNLOCK(td->td_proc);
723 VM_OBJECT_LOCK(shm_object);
724 vm_object_clear_flag(shm_object, OBJ_ONEMAPPING);
725 vm_object_set_flag(shm_object, OBJ_NOSPLIT);
726 VM_OBJECT_UNLOCK(shm_object);
728 shmseg->object = shm_object;
729 shmseg->u.shm_perm.cuid = shmseg->u.shm_perm.uid = cred->cr_uid;
730 shmseg->u.shm_perm.cgid = shmseg->u.shm_perm.gid = cred->cr_gid;
731 shmseg->u.shm_perm.mode = (shmseg->u.shm_perm.mode & SHMSEG_WANTED) |
732 (mode & ACCESSPERMS) | SHMSEG_ALLOCATED;
733 shmseg->cred = crhold(cred);
734 shmseg->u.shm_segsz = uap->size;
735 shmseg->u.shm_cpid = td->td_proc->p_pid;
736 shmseg->u.shm_lpid = shmseg->u.shm_nattch = 0;
737 shmseg->u.shm_atime = shmseg->u.shm_dtime = 0;
739 mac_sysvshm_create(cred, shmseg);
741 shmseg->u.shm_ctime = time_second;
742 shm_committed += btoc(size);
744 if (shmseg->u.shm_perm.mode & SHMSEG_WANTED) {
746 * Somebody else wanted this key while we were asleep. Wake
749 shmseg->u.shm_perm.mode &= ~SHMSEG_WANTED;
752 td->td_retval[0] = shmid;
756 #ifndef _SYS_SYSPROTO_H_
766 struct shmget_args *uap;
771 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
774 mode = uap->shmflg & ACCESSPERMS;
775 if (uap->key != IPC_PRIVATE) {
777 segnum = shm_find_segment_by_key(uap->key);
779 error = shmget_existing(td, uap, mode, segnum);
784 if ((uap->shmflg & IPC_CREAT) == 0) {
789 error = shmget_allocate_segment(td, uap, mode);
796 shmfork_myhook(p1, p2)
797 struct proc *p1, *p2;
799 struct shmmap_state *shmmap_s;
804 size = shminfo.shmseg * sizeof(struct shmmap_state);
805 shmmap_s = malloc(size, M_SHM, M_WAITOK);
806 bcopy(p1->p_vmspace->vm_shm, shmmap_s, size);
807 p2->p_vmspace->vm_shm = shmmap_s;
808 for (i = 0; i < shminfo.shmseg; i++, shmmap_s++)
809 if (shmmap_s->shmid != -1)
810 shmsegs[IPCID_TO_IX(shmmap_s->shmid)].u.shm_nattch++;
815 shmexit_myhook(struct vmspace *vm)
817 struct shmmap_state *base, *shm;
820 if ((base = vm->vm_shm) != NULL) {
823 for (i = 0, shm = base; i < shminfo.shmseg; i++, shm++) {
824 if (shm->shmid != -1)
825 shm_delete_mapping(vm, shm);
836 struct shmid_kernel *newsegs;
838 if (shmalloced >= shminfo.shmmni)
841 newsegs = malloc(shminfo.shmmni * sizeof(*newsegs), M_SHM, M_WAITOK);
842 for (i = 0; i < shmalloced; i++)
843 bcopy(&shmsegs[i], &newsegs[i], sizeof(newsegs[0]));
844 for (; i < shminfo.shmmni; i++) {
845 shmsegs[i].u.shm_perm.mode = SHMSEG_FREE;
846 shmsegs[i].u.shm_perm.seq = 0;
848 mac_sysvshm_init(&shmsegs[i]);
851 free(shmsegs, M_SHM);
853 shmalloced = shminfo.shmmni;
856 static struct syscall_helper_data shm_syscalls[] = {
857 SYSCALL_INIT_HELPER(shmat),
858 SYSCALL_INIT_HELPER(shmctl),
859 SYSCALL_INIT_HELPER(shmdt),
860 SYSCALL_INIT_HELPER(shmget),
861 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
862 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
863 SYSCALL_INIT_HELPER_COMPAT(freebsd7_shmctl),
865 #if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43))
866 SYSCALL_INIT_HELPER(shmsys),
871 #ifdef COMPAT_FREEBSD32
872 #include <compat/freebsd32/freebsd32.h>
873 #include <compat/freebsd32/freebsd32_ipc.h>
874 #include <compat/freebsd32/freebsd32_proto.h>
875 #include <compat/freebsd32/freebsd32_signal.h>
876 #include <compat/freebsd32/freebsd32_syscall.h>
877 #include <compat/freebsd32/freebsd32_util.h>
879 static struct syscall_helper_data shm32_syscalls[] = {
880 SYSCALL32_INIT_HELPER_COMPAT(shmat),
881 SYSCALL32_INIT_HELPER_COMPAT(shmdt),
882 SYSCALL32_INIT_HELPER_COMPAT(shmget),
883 SYSCALL32_INIT_HELPER(freebsd32_shmsys),
884 SYSCALL32_INIT_HELPER(freebsd32_shmctl),
885 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
886 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
887 SYSCALL32_INIT_HELPER(freebsd7_freebsd32_shmctl),
899 if (TUNABLE_ULONG_FETCH("kern.ipc.shmmaxpgs", &shminfo.shmall) != 0)
900 printf("kern.ipc.shmmaxpgs is now called kern.ipc.shmall!\n");
902 TUNABLE_ULONG_FETCH("kern.ipc.shmall", &shminfo.shmall);
904 /* Initialize shmmax dealing with possible overflow. */
905 for (i = PAGE_SIZE; i > 0; i--) {
906 shminfo.shmmax = shminfo.shmall * i;
907 if (shminfo.shmmax >= shminfo.shmall)
911 TUNABLE_ULONG_FETCH("kern.ipc.shmmin", &shminfo.shmmin);
912 TUNABLE_ULONG_FETCH("kern.ipc.shmmni", &shminfo.shmmni);
913 TUNABLE_ULONG_FETCH("kern.ipc.shmseg", &shminfo.shmseg);
914 TUNABLE_INT_FETCH("kern.ipc.shm_use_phys", &shm_use_phys);
916 shmalloced = shminfo.shmmni;
917 shmsegs = malloc(shmalloced * sizeof(shmsegs[0]), M_SHM, M_WAITOK);
918 for (i = 0; i < shmalloced; i++) {
919 shmsegs[i].u.shm_perm.mode = SHMSEG_FREE;
920 shmsegs[i].u.shm_perm.seq = 0;
922 mac_sysvshm_init(&shmsegs[i]);
928 shmexit_hook = &shmexit_myhook;
929 shmfork_hook = &shmfork_myhook;
931 error = syscall_helper_register(shm_syscalls);
934 #ifdef COMPAT_FREEBSD32
935 error = syscall32_helper_register(shm32_syscalls);
950 #ifdef COMPAT_FREEBSD32
951 syscall32_helper_unregister(shm32_syscalls);
953 syscall_helper_unregister(shm_syscalls);
955 for (i = 0; i < shmalloced; i++) {
957 mac_sysvshm_destroy(&shmsegs[i]);
960 * Objects might be still mapped into the processes
961 * address spaces. Actual free would happen on the
962 * last mapping destruction.
964 if (shmsegs[i].u.shm_perm.mode != SHMSEG_FREE)
965 vm_object_deallocate(shmsegs[i].object);
967 free(shmsegs, M_SHM);
974 sysctl_shmsegs(SYSCTL_HANDLER_ARGS)
977 return (SYSCTL_OUT(req, shmsegs, shmalloced * sizeof(shmsegs[0])));
980 #if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43))
982 struct ipc_perm_old shm_perm; /* operation perms */
983 int shm_segsz; /* size of segment (bytes) */
984 u_short shm_cpid; /* pid, creator */
985 u_short shm_lpid; /* pid, last operation */
986 short shm_nattch; /* no. of current attaches */
987 time_t shm_atime; /* last attach time */
988 time_t shm_dtime; /* last detach time */
989 time_t shm_ctime; /* last change time */
990 void *shm_handle; /* internal handle for shm segment */
993 struct oshmctl_args {
996 struct oshmid_ds *ubuf;
1000 oshmctl(struct thread *td, struct oshmctl_args *uap)
1004 struct shmid_kernel *shmseg;
1005 struct oshmid_ds outbuf;
1007 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
1010 shmseg = shm_find_segment_by_shmid(uap->shmid);
1011 if (shmseg == NULL) {
1017 error = ipcperm(td, &shmseg->u.shm_perm, IPC_R);
1021 error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, uap->cmd);
1025 ipcperm_new2old(&shmseg->u.shm_perm, &outbuf.shm_perm);
1026 outbuf.shm_segsz = shmseg->u.shm_segsz;
1027 outbuf.shm_cpid = shmseg->u.shm_cpid;
1028 outbuf.shm_lpid = shmseg->u.shm_lpid;
1029 outbuf.shm_nattch = shmseg->u.shm_nattch;
1030 outbuf.shm_atime = shmseg->u.shm_atime;
1031 outbuf.shm_dtime = shmseg->u.shm_dtime;
1032 outbuf.shm_ctime = shmseg->u.shm_ctime;
1033 outbuf.shm_handle = shmseg->object;
1034 error = copyout(&outbuf, uap->ubuf, sizeof(outbuf));
1039 error = freebsd7_shmctl(td, (struct freebsd7_shmctl_args *)uap);
1050 /* XXX casting to (sy_call_t *) is bogus, as usual. */
1051 static sy_call_t *shmcalls[] = {
1052 (sy_call_t *)sys_shmat, (sy_call_t *)oshmctl,
1053 (sy_call_t *)sys_shmdt, (sy_call_t *)sys_shmget,
1054 (sy_call_t *)freebsd7_shmctl
1060 /* XXX actually varargs. */
1061 struct shmsys_args /* {
1070 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
1072 if (uap->which < 0 ||
1073 uap->which >= sizeof(shmcalls)/sizeof(shmcalls[0]))
1076 error = (*shmcalls[uap->which])(td, &uap->a2);
1081 #endif /* i386 && (COMPAT_FREEBSD4 || COMPAT_43) */
1083 #ifdef COMPAT_FREEBSD32
1086 freebsd32_shmsys(struct thread *td, struct freebsd32_shmsys_args *uap)
1089 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1090 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1091 switch (uap->which) {
1092 case 0: { /* shmat */
1093 struct shmat_args ap;
1096 ap.shmaddr = PTRIN(uap->a3);
1097 ap.shmflg = uap->a4;
1098 return (sysent[SYS_shmat].sy_call(td, &ap));
1100 case 2: { /* shmdt */
1101 struct shmdt_args ap;
1103 ap.shmaddr = PTRIN(uap->a2);
1104 return (sysent[SYS_shmdt].sy_call(td, &ap));
1106 case 3: { /* shmget */
1107 struct shmget_args ap;
1111 ap.shmflg = uap->a4;
1112 return (sysent[SYS_shmget].sy_call(td, &ap));
1114 case 4: { /* shmctl */
1115 struct freebsd7_freebsd32_shmctl_args ap;
1119 ap.buf = PTRIN(uap->a4);
1120 return (freebsd7_freebsd32_shmctl(td, &ap));
1122 case 1: /* oshmctl */
1127 return (nosys(td, NULL));
1131 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1132 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1134 freebsd7_freebsd32_shmctl(struct thread *td,
1135 struct freebsd7_freebsd32_shmctl_args *uap)
1139 struct shmid_ds shmid_ds;
1140 struct shm_info shm_info;
1141 struct shminfo shminfo;
1144 struct shmid_ds32_old shmid_ds32;
1145 struct shm_info32 shm_info32;
1146 struct shminfo32 shminfo32;
1150 if (uap->cmd == IPC_SET) {
1151 if ((error = copyin(uap->buf, &u32.shmid_ds32,
1152 sizeof(u32.shmid_ds32))))
1154 freebsd32_ipcperm_old_in(&u32.shmid_ds32.shm_perm,
1155 &u.shmid_ds.shm_perm);
1156 CP(u32.shmid_ds32, u.shmid_ds, shm_segsz);
1157 CP(u32.shmid_ds32, u.shmid_ds, shm_lpid);
1158 CP(u32.shmid_ds32, u.shmid_ds, shm_cpid);
1159 CP(u32.shmid_ds32, u.shmid_ds, shm_nattch);
1160 CP(u32.shmid_ds32, u.shmid_ds, shm_atime);
1161 CP(u32.shmid_ds32, u.shmid_ds, shm_dtime);
1162 CP(u32.shmid_ds32, u.shmid_ds, shm_ctime);
1165 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz);
1169 /* Cases in which we need to copyout */
1172 CP(u.shminfo, u32.shminfo32, shmmax);
1173 CP(u.shminfo, u32.shminfo32, shmmin);
1174 CP(u.shminfo, u32.shminfo32, shmmni);
1175 CP(u.shminfo, u32.shminfo32, shmseg);
1176 CP(u.shminfo, u32.shminfo32, shmall);
1177 error = copyout(&u32.shminfo32, uap->buf,
1178 sizeof(u32.shminfo32));
1181 CP(u.shm_info, u32.shm_info32, used_ids);
1182 CP(u.shm_info, u32.shm_info32, shm_rss);
1183 CP(u.shm_info, u32.shm_info32, shm_tot);
1184 CP(u.shm_info, u32.shm_info32, shm_swp);
1185 CP(u.shm_info, u32.shm_info32, swap_attempts);
1186 CP(u.shm_info, u32.shm_info32, swap_successes);
1187 error = copyout(&u32.shm_info32, uap->buf,
1188 sizeof(u32.shm_info32));
1192 freebsd32_ipcperm_old_out(&u.shmid_ds.shm_perm,
1193 &u32.shmid_ds32.shm_perm);
1194 if (u.shmid_ds.shm_segsz > INT32_MAX)
1195 u32.shmid_ds32.shm_segsz = INT32_MAX;
1197 CP(u.shmid_ds, u32.shmid_ds32, shm_segsz);
1198 CP(u.shmid_ds, u32.shmid_ds32, shm_lpid);
1199 CP(u.shmid_ds, u32.shmid_ds32, shm_cpid);
1200 CP(u.shmid_ds, u32.shmid_ds32, shm_nattch);
1201 CP(u.shmid_ds, u32.shmid_ds32, shm_atime);
1202 CP(u.shmid_ds, u32.shmid_ds32, shm_dtime);
1203 CP(u.shmid_ds, u32.shmid_ds32, shm_ctime);
1204 u32.shmid_ds32.shm_internal = 0;
1205 error = copyout(&u32.shmid_ds32, uap->buf,
1206 sizeof(u32.shmid_ds32));
1212 /* Invalidate the return value */
1213 td->td_retval[0] = -1;
1220 freebsd32_shmctl(struct thread *td, struct freebsd32_shmctl_args *uap)
1224 struct shmid_ds shmid_ds;
1225 struct shm_info shm_info;
1226 struct shminfo shminfo;
1229 struct shmid_ds32 shmid_ds32;
1230 struct shm_info32 shm_info32;
1231 struct shminfo32 shminfo32;
1235 if (uap->cmd == IPC_SET) {
1236 if ((error = copyin(uap->buf, &u32.shmid_ds32,
1237 sizeof(u32.shmid_ds32))))
1239 freebsd32_ipcperm_in(&u32.shmid_ds32.shm_perm,
1240 &u.shmid_ds.shm_perm);
1241 CP(u32.shmid_ds32, u.shmid_ds, shm_segsz);
1242 CP(u32.shmid_ds32, u.shmid_ds, shm_lpid);
1243 CP(u32.shmid_ds32, u.shmid_ds, shm_cpid);
1244 CP(u32.shmid_ds32, u.shmid_ds, shm_nattch);
1245 CP(u32.shmid_ds32, u.shmid_ds, shm_atime);
1246 CP(u32.shmid_ds32, u.shmid_ds, shm_dtime);
1247 CP(u32.shmid_ds32, u.shmid_ds, shm_ctime);
1250 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz);
1254 /* Cases in which we need to copyout */
1257 CP(u.shminfo, u32.shminfo32, shmmax);
1258 CP(u.shminfo, u32.shminfo32, shmmin);
1259 CP(u.shminfo, u32.shminfo32, shmmni);
1260 CP(u.shminfo, u32.shminfo32, shmseg);
1261 CP(u.shminfo, u32.shminfo32, shmall);
1262 error = copyout(&u32.shminfo32, uap->buf,
1263 sizeof(u32.shminfo32));
1266 CP(u.shm_info, u32.shm_info32, used_ids);
1267 CP(u.shm_info, u32.shm_info32, shm_rss);
1268 CP(u.shm_info, u32.shm_info32, shm_tot);
1269 CP(u.shm_info, u32.shm_info32, shm_swp);
1270 CP(u.shm_info, u32.shm_info32, swap_attempts);
1271 CP(u.shm_info, u32.shm_info32, swap_successes);
1272 error = copyout(&u32.shm_info32, uap->buf,
1273 sizeof(u32.shm_info32));
1277 freebsd32_ipcperm_out(&u.shmid_ds.shm_perm,
1278 &u32.shmid_ds32.shm_perm);
1279 if (u.shmid_ds.shm_segsz > INT32_MAX)
1280 u32.shmid_ds32.shm_segsz = INT32_MAX;
1282 CP(u.shmid_ds, u32.shmid_ds32, shm_segsz);
1283 CP(u.shmid_ds, u32.shmid_ds32, shm_lpid);
1284 CP(u.shmid_ds, u32.shmid_ds32, shm_cpid);
1285 CP(u.shmid_ds, u32.shmid_ds32, shm_nattch);
1286 CP(u.shmid_ds, u32.shmid_ds32, shm_atime);
1287 CP(u.shmid_ds, u32.shmid_ds32, shm_dtime);
1288 CP(u.shmid_ds, u32.shmid_ds32, shm_ctime);
1289 error = copyout(&u32.shmid_ds32, uap->buf,
1290 sizeof(u32.shmid_ds32));
1296 /* Invalidate the return value */
1297 td->td_retval[0] = -1;
1303 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1304 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1307 #define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0)
1310 #ifndef _SYS_SYSPROTO_H_
1311 struct freebsd7_shmctl_args {
1314 struct shmid_ds_old *buf;
1318 freebsd7_shmctl(td, uap)
1320 struct freebsd7_shmctl_args *uap;
1323 struct shmid_ds_old old;
1324 struct shmid_ds buf;
1328 * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support
1329 * Linux binaries. If we see the call come through the FreeBSD ABI,
1330 * return an error back to the user since we do not to support this.
1332 if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO ||
1333 uap->cmd == SHM_STAT)
1336 /* IPC_SET needs to copyin the buffer before calling kern_shmctl */
1337 if (uap->cmd == IPC_SET) {
1338 if ((error = copyin(uap->buf, &old, sizeof(old))))
1340 ipcperm_old2new(&old.shm_perm, &buf.shm_perm);
1341 CP(old, buf, shm_segsz);
1342 CP(old, buf, shm_lpid);
1343 CP(old, buf, shm_cpid);
1344 CP(old, buf, shm_nattch);
1345 CP(old, buf, shm_atime);
1346 CP(old, buf, shm_dtime);
1347 CP(old, buf, shm_ctime);
1350 error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz);
1354 /* Cases in which we need to copyout */
1357 ipcperm_new2old(&buf.shm_perm, &old.shm_perm);
1358 if (buf.shm_segsz > INT_MAX)
1359 old.shm_segsz = INT_MAX;
1361 CP(buf, old, shm_segsz);
1362 CP(buf, old, shm_lpid);
1363 CP(buf, old, shm_cpid);
1364 if (buf.shm_nattch > SHRT_MAX)
1365 old.shm_nattch = SHRT_MAX;
1367 CP(buf, old, shm_nattch);
1368 CP(buf, old, shm_atime);
1369 CP(buf, old, shm_dtime);
1370 CP(buf, old, shm_ctime);
1371 old.shm_internal = NULL;
1372 error = copyout(&old, uap->buf, sizeof(old));
1378 /* Invalidate the return value */
1379 td->td_retval[0] = -1;
1384 #endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 ||
1388 sysvshm_modload(struct module *module, int cmd, void *arg)
1399 error = shmunload();
1410 static moduledata_t sysvshm_mod = {
1416 DECLARE_MODULE(sysvshm, sysvshm_mod, SI_SUB_SYSV_SHM, SI_ORDER_FIRST);
1417 MODULE_VERSION(sysvshm, 1);