xref: /freebsd/sys/kern/sysv_shm.c (revision d9c9c81c083a76a65c6cacf8fcbc0511e2ffa489)
13d903220SDoug Rabson /*	$NetBSD: sysv_shm.c,v 1.23 1994/07/04 23:25:12 glass Exp $	*/
29454b2d8SWarner Losh /*-
33d903220SDoug Rabson  * Copyright (c) 1994 Adam Glass and Charles Hannum.  All rights reserved.
43d903220SDoug Rabson  *
53d903220SDoug Rabson  * Redistribution and use in source and binary forms, with or without
63d903220SDoug Rabson  * modification, are permitted provided that the following conditions
73d903220SDoug Rabson  * are met:
83d903220SDoug Rabson  * 1. Redistributions of source code must retain the above copyright
93d903220SDoug Rabson  *    notice, this list of conditions and the following disclaimer.
103d903220SDoug Rabson  * 2. Redistributions in binary form must reproduce the above copyright
113d903220SDoug Rabson  *    notice, this list of conditions and the following disclaimer in the
123d903220SDoug Rabson  *    documentation and/or other materials provided with the distribution.
133d903220SDoug Rabson  * 3. All advertising materials mentioning features or use of this software
143d903220SDoug Rabson  *    must display the following acknowledgement:
153d903220SDoug Rabson  *	This product includes software developed by Adam Glass and Charles
163d903220SDoug Rabson  *	Hannum.
173d903220SDoug Rabson  * 4. The names of the authors may not be used to endorse or promote products
183d903220SDoug Rabson  *    derived from this software without specific prior written permission.
193d903220SDoug Rabson  *
203d903220SDoug Rabson  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
213d903220SDoug Rabson  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
223d903220SDoug Rabson  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
233d903220SDoug Rabson  * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
243d903220SDoug Rabson  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
253d903220SDoug Rabson  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
263d903220SDoug Rabson  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
273d903220SDoug Rabson  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
283d903220SDoug Rabson  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
293d903220SDoug Rabson  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
303d903220SDoug Rabson  */
3114cedfc8SRobert Watson /*-
3214cedfc8SRobert Watson  * Copyright (c) 2003-2005 McAfee, Inc.
3314cedfc8SRobert Watson  * All rights reserved.
3414cedfc8SRobert Watson  *
3514cedfc8SRobert Watson  * This software was developed for the FreeBSD Project in part by McAfee
3614cedfc8SRobert Watson  * Research, the Security Research Division of McAfee, Inc under DARPA/SPAWAR
3714cedfc8SRobert Watson  * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS research
3814cedfc8SRobert Watson  * program.
3914cedfc8SRobert Watson  *
4014cedfc8SRobert Watson  * Redistribution and use in source and binary forms, with or without
4114cedfc8SRobert Watson  * modification, are permitted provided that the following conditions
4214cedfc8SRobert Watson  * are met:
4314cedfc8SRobert Watson  * 1. Redistributions of source code must retain the above copyright
4414cedfc8SRobert Watson  *    notice, this list of conditions and the following disclaimer.
4514cedfc8SRobert Watson  * 2. Redistributions in binary form must reproduce the above copyright
4614cedfc8SRobert Watson  *    notice, this list of conditions and the following disclaimer in the
4714cedfc8SRobert Watson  *    documentation and/or other materials provided with the distribution.
4814cedfc8SRobert Watson  *
4914cedfc8SRobert Watson  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
5014cedfc8SRobert Watson  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
5114cedfc8SRobert Watson  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
5214cedfc8SRobert Watson  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
5314cedfc8SRobert Watson  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
5414cedfc8SRobert Watson  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
5514cedfc8SRobert Watson  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
5614cedfc8SRobert Watson  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
5714cedfc8SRobert Watson  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
5814cedfc8SRobert Watson  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
5914cedfc8SRobert Watson  * SUCH DAMAGE.
6014cedfc8SRobert Watson  */
613d903220SDoug Rabson 
62677b542eSDavid E. O'Brien #include <sys/cdefs.h>
63677b542eSDavid E. O'Brien __FBSDID("$FreeBSD$");
64677b542eSDavid E. O'Brien 
655591b823SEivind Eklund #include "opt_compat.h"
66255108f3SPeter Wemm #include "opt_sysvipc.h"
67511b67b7SGarrett Wollman 
683d903220SDoug Rabson #include <sys/param.h>
69725db531SBruce Evans #include <sys/systm.h>
703d903220SDoug Rabson #include <sys/kernel.h>
71b648d480SJohn Baldwin #include <sys/limits.h>
72fb919e4dSMark Murray #include <sys/lock.h>
73255108f3SPeter Wemm #include <sys/sysctl.h>
743d903220SDoug Rabson #include <sys/shm.h>
753d903220SDoug Rabson #include <sys/proc.h>
763d903220SDoug Rabson #include <sys/malloc.h>
773d903220SDoug Rabson #include <sys/mman.h>
7877409fe1SPoul-Henning Kamp #include <sys/module.h>
799dceb26bSJohn Baldwin #include <sys/mutex.h>
803bcf7445SEdward Tomasz Napierala #include <sys/racct.h>
8168ba7a1dSTim J. Robbins #include <sys/resourcevar.h>
8289f6b863SAttilio Rao #include <sys/rwlock.h>
833d903220SDoug Rabson #include <sys/stat.h>
8478525ce3SAlfred Perlstein #include <sys/syscall.h>
85f130dcf2SMartin Blapp #include <sys/syscallsubr.h>
86725db531SBruce Evans #include <sys/sysent.h>
87fb919e4dSMark Murray #include <sys/sysproto.h>
88cb1f0db9SRobert Watson #include <sys/jail.h>
89aed55708SRobert Watson 
90aed55708SRobert Watson #include <security/mac/mac_framework.h>
913d903220SDoug Rabson 
923d903220SDoug Rabson #include <vm/vm.h>
93efeaf95aSDavid Greenman #include <vm/vm_param.h>
94efeaf95aSDavid Greenman #include <vm/pmap.h>
95a51f7119SJohn Dyson #include <vm/vm_object.h>
963d903220SDoug Rabson #include <vm/vm_map.h>
971c7c3c6aSMatthew Dillon #include <vm/vm_page.h>
98ae9b8c3aSJohn Dyson #include <vm/vm_pager.h>
993d903220SDoug Rabson 
100de5b1952SAlexander Leidinger FEATURE(sysv_shm, "System V shared memory segments support");
101de5b1952SAlexander Leidinger 
102a1c995b6SPoul-Henning Kamp static MALLOC_DEFINE(M_SHM, "shm", "SVID compatible shared memory segments");
10355166637SPoul-Henning Kamp 
1044d77a549SAlfred Perlstein static int shmget_allocate_segment(struct thread *td,
1054d77a549SAlfred Perlstein     struct shmget_args *uap, int mode);
1064d77a549SAlfred Perlstein static int shmget_existing(struct thread *td, struct shmget_args *uap,
1074d77a549SAlfred Perlstein     int mode, int segnum);
108725db531SBruce Evans 
1093d903220SDoug Rabson #define	SHMSEG_FREE     	0x0200
1103d903220SDoug Rabson #define	SHMSEG_REMOVED  	0x0400
1113d903220SDoug Rabson #define	SHMSEG_ALLOCATED	0x0800
1123d903220SDoug Rabson 
11365067cc8SKonstantin Belousov static int shm_last_free, shm_nused, shmalloced;
11445329b60SKonstantin Belousov vm_size_t shm_committed;
115921d05b9SRobert Watson static struct shmid_kernel	*shmsegs;
1163d903220SDoug Rabson 
1173d903220SDoug Rabson struct shmmap_state {
1183d903220SDoug Rabson 	vm_offset_t va;
1193d903220SDoug Rabson 	int shmid;
1203d903220SDoug Rabson };
1213d903220SDoug Rabson 
122921d05b9SRobert Watson static void shm_deallocate_segment(struct shmid_kernel *);
1234d77a549SAlfred Perlstein static int shm_find_segment_by_key(key_t);
1240555fb35SKonstantin Belousov static struct shmid_kernel *shm_find_segment(int, bool);
1253db161e0SMatthew Dillon static int shm_delete_mapping(struct vmspace *vm, struct shmmap_state *);
1264d77a549SAlfred Perlstein static void shmrealloc(void);
12775d633cbSKonstantin Belousov static int shminit(void);
1284d77a549SAlfred Perlstein static int sysvshm_modload(struct module *, int, void *);
1294d77a549SAlfred Perlstein static int shmunload(void);
1303db161e0SMatthew Dillon static void shmexit_myhook(struct vmspace *vm);
1314d77a549SAlfred Perlstein static void shmfork_myhook(struct proc *p1, struct proc *p2);
1324d77a549SAlfred Perlstein static int sysctl_shmsegs(SYSCTL_HANDLER_ARGS);
133255108f3SPeter Wemm 
134255108f3SPeter Wemm /*
135028f979dSDima Dorfman  * Tuneable values.
136255108f3SPeter Wemm  */
137255108f3SPeter Wemm #ifndef SHMMAXPGS
138c1e34abfSIvan Voras #define	SHMMAXPGS	131072	/* Note: sysv shared memory is swap backed. */
139255108f3SPeter Wemm #endif
140255108f3SPeter Wemm #ifndef SHMMAX
141255108f3SPeter Wemm #define	SHMMAX	(SHMMAXPGS*PAGE_SIZE)
142255108f3SPeter Wemm #endif
143255108f3SPeter Wemm #ifndef SHMMIN
144255108f3SPeter Wemm #define	SHMMIN	1
145255108f3SPeter Wemm #endif
146255108f3SPeter Wemm #ifndef SHMMNI
1471766b2e5SMatthew Dillon #define	SHMMNI	192
148255108f3SPeter Wemm #endif
149255108f3SPeter Wemm #ifndef SHMSEG
1501766b2e5SMatthew Dillon #define	SHMSEG	128
151255108f3SPeter Wemm #endif
152255108f3SPeter Wemm #ifndef SHMALL
153255108f3SPeter Wemm #define	SHMALL	(SHMMAXPGS)
154255108f3SPeter Wemm #endif
155255108f3SPeter Wemm 
156255108f3SPeter Wemm struct	shminfo shminfo = {
157af3b2549SHans Petter Selasky 	.shmmax = SHMMAX,
158af3b2549SHans Petter Selasky 	.shmmin = SHMMIN,
159af3b2549SHans Petter Selasky 	.shmmni = SHMMNI,
160af3b2549SHans Petter Selasky 	.shmseg = SHMSEG,
161af3b2549SHans Petter Selasky 	.shmall = SHMALL
162255108f3SPeter Wemm };
163255108f3SPeter Wemm 
1648b03c8edSMatthew Dillon static int shm_use_phys;
16592001b94SEdward Tomasz Napierala static int shm_allow_removed = 1;
1668b03c8edSMatthew Dillon 
167af3b2549SHans Petter Selasky SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmax, CTLFLAG_RWTUN, &shminfo.shmmax, 0,
16884f85aedSChristian S.J. Peron     "Maximum shared memory segment size");
169af3b2549SHans Petter Selasky SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmin, CTLFLAG_RWTUN, &shminfo.shmmin, 0,
17084f85aedSChristian S.J. Peron     "Minimum shared memory segment size");
1719baea4b4SChristian S.J. Peron SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmni, CTLFLAG_RDTUN, &shminfo.shmmni, 0,
17284f85aedSChristian S.J. Peron     "Number of shared memory identifiers");
1739baea4b4SChristian S.J. Peron SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmseg, CTLFLAG_RDTUN, &shminfo.shmseg, 0,
17484f85aedSChristian S.J. Peron     "Number of segments per process");
175af3b2549SHans Petter Selasky SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmall, CTLFLAG_RWTUN, &shminfo.shmall, 0,
17684f85aedSChristian S.J. Peron     "Maximum number of pages available for shared memory");
177af3b2549SHans Petter Selasky SYSCTL_INT(_kern_ipc, OID_AUTO, shm_use_phys, CTLFLAG_RWTUN,
17884f85aedSChristian S.J. Peron     &shm_use_phys, 0, "Enable/Disable locking of shared memory pages in core");
179af3b2549SHans Petter Selasky SYSCTL_INT(_kern_ipc, OID_AUTO, shm_allow_removed, CTLFLAG_RWTUN,
18084f85aedSChristian S.J. Peron     &shm_allow_removed, 0,
18184f85aedSChristian S.J. Peron     "Enable/Disable attachment to attached segments marked for removal");
1820555fb35SKonstantin Belousov SYSCTL_PROC(_kern_ipc, OID_AUTO, shmsegs, CTLTYPE_OPAQUE | CTLFLAG_RD |
1830555fb35SKonstantin Belousov     CTLFLAG_MPSAFE, NULL, 0, sysctl_shmsegs, "",
18484f85aedSChristian S.J. Peron     "Current number of shared memory segments allocated");
1853d903220SDoug Rabson 
1860555fb35SKonstantin Belousov static struct sx sysvshmsx;
1870555fb35SKonstantin Belousov #define	SYSVSHM_LOCK()		sx_xlock(&sysvshmsx)
1880555fb35SKonstantin Belousov #define	SYSVSHM_UNLOCK()	sx_xunlock(&sysvshmsx)
1890555fb35SKonstantin Belousov #define	SYSVSHM_ASSERT_LOCKED()	sx_assert(&sysvshmsx, SA_XLOCKED)
1900555fb35SKonstantin Belousov 
1913d903220SDoug Rabson static int
1920555fb35SKonstantin Belousov shm_find_segment_by_key(key_t key)
1933d903220SDoug Rabson {
1943d903220SDoug Rabson 	int i;
1953d903220SDoug Rabson 
196255108f3SPeter Wemm 	for (i = 0; i < shmalloced; i++)
197921d05b9SRobert Watson 		if ((shmsegs[i].u.shm_perm.mode & SHMSEG_ALLOCATED) &&
198921d05b9SRobert Watson 		    shmsegs[i].u.shm_perm.key == key)
199b618bb96SAlfred Perlstein 			return (i);
200b618bb96SAlfred Perlstein 	return (-1);
2013d903220SDoug Rabson }
2023d903220SDoug Rabson 
2030555fb35SKonstantin Belousov /*
2040555fb35SKonstantin Belousov  * Finds segment either by shmid if is_shmid is true, or by segnum if
2050555fb35SKonstantin Belousov  * is_shmid is false.
2060555fb35SKonstantin Belousov  */
207921d05b9SRobert Watson static struct shmid_kernel *
2080555fb35SKonstantin Belousov shm_find_segment(int arg, bool is_shmid)
2093d903220SDoug Rabson {
210921d05b9SRobert Watson 	struct shmid_kernel *shmseg;
2110555fb35SKonstantin Belousov 	int segnum;
2123d903220SDoug Rabson 
2130555fb35SKonstantin Belousov 	segnum = is_shmid ? IPCID_TO_IX(arg) : arg;
214255108f3SPeter Wemm 	if (segnum < 0 || segnum >= shmalloced)
215b618bb96SAlfred Perlstein 		return (NULL);
2163d903220SDoug Rabson 	shmseg = &shmsegs[segnum];
217921d05b9SRobert Watson 	if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 ||
2182332251cSMax Khon 	    (!shm_allow_removed &&
219921d05b9SRobert Watson 	    (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) != 0) ||
2200555fb35SKonstantin Belousov 	    (is_shmid && shmseg->u.shm_perm.seq != IPCID_TO_SEQ(arg)))
221b618bb96SAlfred Perlstein 		return (NULL);
222b618bb96SAlfred Perlstein 	return (shmseg);
223491dec93SMichael Reifenberger }
224491dec93SMichael Reifenberger 
2253d903220SDoug Rabson static void
2260555fb35SKonstantin Belousov shm_deallocate_segment(struct shmid_kernel *shmseg)
2273d903220SDoug Rabson {
22845329b60SKonstantin Belousov 	vm_size_t size;
2293d903220SDoug Rabson 
2300555fb35SKonstantin Belousov 	SYSVSHM_ASSERT_LOCKED();
2310cddd8f0SMatthew Dillon 
232b648d480SJohn Baldwin 	vm_object_deallocate(shmseg->object);
233b648d480SJohn Baldwin 	shmseg->object = NULL;
234b648d480SJohn Baldwin 	size = round_page(shmseg->u.shm_segsz);
2353d903220SDoug Rabson 	shm_committed -= btoc(size);
2363d903220SDoug Rabson 	shm_nused--;
237921d05b9SRobert Watson 	shmseg->u.shm_perm.mode = SHMSEG_FREE;
23814cedfc8SRobert Watson #ifdef MAC
23930d239bcSRobert Watson 	mac_sysvshm_cleanup(shmseg);
24014cedfc8SRobert Watson #endif
2413bcf7445SEdward Tomasz Napierala 	racct_sub_cred(shmseg->cred, RACCT_NSHM, 1);
2423bcf7445SEdward Tomasz Napierala 	racct_sub_cred(shmseg->cred, RACCT_SHMSIZE, size);
2438caddd81SEdward Tomasz Napierala 	crfree(shmseg->cred);
2448caddd81SEdward Tomasz Napierala 	shmseg->cred = NULL;
2453d903220SDoug Rabson }
2463d903220SDoug Rabson 
2473d903220SDoug Rabson static int
2483db161e0SMatthew Dillon shm_delete_mapping(struct vmspace *vm, struct shmmap_state *shmmap_s)
2493d903220SDoug Rabson {
250921d05b9SRobert Watson 	struct shmid_kernel *shmseg;
2513d903220SDoug Rabson 	int segnum, result;
25245329b60SKonstantin Belousov 	vm_size_t size;
2533d903220SDoug Rabson 
2540555fb35SKonstantin Belousov 	SYSVSHM_ASSERT_LOCKED();
2553d903220SDoug Rabson 	segnum = IPCID_TO_IX(shmmap_s->shmid);
2560555fb35SKonstantin Belousov 	KASSERT(segnum >= 0 && segnum < shmalloced,
2570555fb35SKonstantin Belousov 	    ("segnum %d shmalloced %d", segnum, shmalloced));
2580555fb35SKonstantin Belousov 
2593d903220SDoug Rabson 	shmseg = &shmsegs[segnum];
260b648d480SJohn Baldwin 	size = round_page(shmseg->u.shm_segsz);
2613db161e0SMatthew Dillon 	result = vm_map_remove(&vm->vm_map, shmmap_s->va, shmmap_s->va + size);
2623d903220SDoug Rabson 	if (result != KERN_SUCCESS)
263b618bb96SAlfred Perlstein 		return (EINVAL);
2643d903220SDoug Rabson 	shmmap_s->shmid = -1;
265921d05b9SRobert Watson 	shmseg->u.shm_dtime = time_second;
266921d05b9SRobert Watson 	if ((--shmseg->u.shm_nattch <= 0) &&
267921d05b9SRobert Watson 	    (shmseg->u.shm_perm.mode & SHMSEG_REMOVED)) {
2683d903220SDoug Rabson 		shm_deallocate_segment(shmseg);
2693d903220SDoug Rabson 		shm_last_free = segnum;
2703d903220SDoug Rabson 	}
271b618bb96SAlfred Perlstein 	return (0);
2723d903220SDoug Rabson }
2733d903220SDoug Rabson 
2740555fb35SKonstantin Belousov static int
2750555fb35SKonstantin Belousov kern_shmdt_locked(struct thread *td, const void *shmaddr)
2763d903220SDoug Rabson {
277b40ce416SJulian Elischer 	struct proc *p = td->td_proc;
2783d903220SDoug Rabson 	struct shmmap_state *shmmap_s;
27914cedfc8SRobert Watson #ifdef MAC
28014cedfc8SRobert Watson 	struct shmid_kernel *shmsegptr;
281e2f5418eSMateusz Guzik 	int error;
28214cedfc8SRobert Watson #endif
283e2f5418eSMateusz Guzik 	int i;
2843d903220SDoug Rabson 
2850555fb35SKonstantin Belousov 	SYSVSHM_ASSERT_LOCKED();
2860304c731SJamie Gritton 	if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
287c6f55f33SJohn Baldwin 		return (ENOSYS);
2888209f090SAlfred Perlstein 	shmmap_s = p->p_vmspace->vm_shm;
2890555fb35SKonstantin Belousov  	if (shmmap_s == NULL)
2900555fb35SKonstantin Belousov 		return (EINVAL);
291b6a4b4f9SMatthew Dillon 	for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) {
2923d903220SDoug Rabson 		if (shmmap_s->shmid != -1 &&
2930555fb35SKonstantin Belousov 		    shmmap_s->va == (vm_offset_t)shmaddr) {
2943d903220SDoug Rabson 			break;
295b6a4b4f9SMatthew Dillon 		}
296b6a4b4f9SMatthew Dillon 	}
2970555fb35SKonstantin Belousov 	if (i == shminfo.shmseg)
2980555fb35SKonstantin Belousov 		return (EINVAL);
29914cedfc8SRobert Watson #ifdef MAC
30014cedfc8SRobert Watson 	shmsegptr = &shmsegs[IPCID_TO_IX(shmmap_s->shmid)];
30130d239bcSRobert Watson 	error = mac_sysvshm_check_shmdt(td->td_ucred, shmsegptr);
302f50c4fd8SRobert Watson 	if (error != 0)
3030555fb35SKonstantin Belousov 		return (error);
30414cedfc8SRobert Watson #endif
305e2f5418eSMateusz Guzik 	return (shm_delete_mapping(p->p_vmspace, shmmap_s));
3063d903220SDoug Rabson }
3073d903220SDoug Rabson 
308b5d5c0c9SPeter Wemm #ifndef _SYS_SYSPROTO_H_
3090555fb35SKonstantin Belousov struct shmdt_args {
310e1d7d0bbSAlfred Perlstein 	const void *shmaddr;
3113d903220SDoug Rabson };
312b5d5c0c9SPeter Wemm #endif
3133d903220SDoug Rabson int
3140555fb35SKonstantin Belousov sys_shmdt(struct thread *td, struct shmdt_args *uap)
3150555fb35SKonstantin Belousov {
3160555fb35SKonstantin Belousov 	int error;
3170555fb35SKonstantin Belousov 
3180555fb35SKonstantin Belousov 	SYSVSHM_LOCK();
3190555fb35SKonstantin Belousov 	error = kern_shmdt_locked(td, uap->shmaddr);
3200555fb35SKonstantin Belousov 	SYSVSHM_UNLOCK();
3210555fb35SKonstantin Belousov 	return (error);
3220555fb35SKonstantin Belousov }
3230555fb35SKonstantin Belousov 
3240555fb35SKonstantin Belousov static int
3250555fb35SKonstantin Belousov kern_shmat_locked(struct thread *td, int shmid, const void *shmaddr,
3260555fb35SKonstantin Belousov     int shmflg)
3273d903220SDoug Rabson {
328b40ce416SJulian Elischer 	struct proc *p = td->td_proc;
329921d05b9SRobert Watson 	struct shmid_kernel *shmseg;
3300122d251SKonstantin Belousov 	struct shmmap_state *shmmap_s;
3313d903220SDoug Rabson 	vm_offset_t attach_va;
3323d903220SDoug Rabson 	vm_prot_t prot;
3333d903220SDoug Rabson 	vm_size_t size;
3340555fb35SKonstantin Belousov 	int error, i, rv;
3353d903220SDoug Rabson 
3360555fb35SKonstantin Belousov 	SYSVSHM_ASSERT_LOCKED();
3370304c731SJamie Gritton 	if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
338c6f55f33SJohn Baldwin 		return (ENOSYS);
3398209f090SAlfred Perlstein 	shmmap_s = p->p_vmspace->vm_shm;
3403d903220SDoug Rabson 	if (shmmap_s == NULL) {
34145329b60SKonstantin Belousov 		shmmap_s = malloc(shminfo.shmseg * sizeof(struct shmmap_state),
34245329b60SKonstantin Belousov 		    M_SHM, M_WAITOK);
3433d903220SDoug Rabson 		for (i = 0; i < shminfo.shmseg; i++)
3443d903220SDoug Rabson 			shmmap_s[i].shmid = -1;
3450555fb35SKonstantin Belousov 		KASSERT(p->p_vmspace->vm_shm == NULL, ("raced"));
3462cc593fdSAlfred Perlstein 		p->p_vmspace->vm_shm = shmmap_s;
3473d903220SDoug Rabson 	}
3480555fb35SKonstantin Belousov 	shmseg = shm_find_segment(shmid, true);
3490555fb35SKonstantin Belousov 	if (shmseg == NULL)
3500555fb35SKonstantin Belousov 		return (EINVAL);
351921d05b9SRobert Watson 	error = ipcperm(td, &shmseg->u.shm_perm,
352f130dcf2SMartin Blapp 	    (shmflg & SHM_RDONLY) ? IPC_R : IPC_R|IPC_W);
3530555fb35SKonstantin Belousov 	if (error != 0)
3540555fb35SKonstantin Belousov 		return (error);
35514cedfc8SRobert Watson #ifdef MAC
35630d239bcSRobert Watson 	error = mac_sysvshm_check_shmat(td->td_ucred, shmseg, shmflg);
357f50c4fd8SRobert Watson 	if (error != 0)
3580555fb35SKonstantin Belousov 		return (error);
35914cedfc8SRobert Watson #endif
3603d903220SDoug Rabson 	for (i = 0; i < shminfo.shmseg; i++) {
3613d903220SDoug Rabson 		if (shmmap_s->shmid == -1)
3623d903220SDoug Rabson 			break;
3633d903220SDoug Rabson 		shmmap_s++;
3643d903220SDoug Rabson 	}
3650555fb35SKonstantin Belousov 	if (i >= shminfo.shmseg)
3660555fb35SKonstantin Belousov 		return (EMFILE);
367b648d480SJohn Baldwin 	size = round_page(shmseg->u.shm_segsz);
3683d903220SDoug Rabson 	prot = VM_PROT_READ;
369f130dcf2SMartin Blapp 	if ((shmflg & SHM_RDONLY) == 0)
3703d903220SDoug Rabson 		prot |= VM_PROT_WRITE;
3710555fb35SKonstantin Belousov 	if (shmaddr != NULL) {
3720555fb35SKonstantin Belousov 		if ((shmflg & SHM_RND) != 0)
373*d9c9c81cSPedro F. Giffuni 			attach_va = rounddown2((vm_offset_t)shmaddr, SHMLBA);
3740555fb35SKonstantin Belousov 		else if (((vm_offset_t)shmaddr & (SHMLBA-1)) == 0)
375f130dcf2SMartin Blapp 			attach_va = (vm_offset_t)shmaddr;
3760555fb35SKonstantin Belousov 		else
3770555fb35SKonstantin Belousov 			return (EINVAL);
3783d903220SDoug Rabson 	} else {
379028f979dSDima Dorfman 		/*
380028f979dSDima Dorfman 		 * This is just a hint to vm_map_find() about where to
381028f979dSDima Dorfman 		 * put it.
382028f979dSDima Dorfman 		 */
38368ba7a1dSTim J. Robbins 		attach_va = round_page((vm_offset_t)p->p_vmspace->vm_daddr +
38477a26248SMateusz Guzik 		    lim_max(td, RLIMIT_DATA));
3853d903220SDoug Rabson 	}
386a51f7119SJohn Dyson 
387b648d480SJohn Baldwin 	vm_object_reference(shmseg->object);
38801a8fb7dSAlan Cox 	rv = vm_map_find(&p->p_vmspace->vm_map, shmseg->object, 0, &attach_va,
38901a8fb7dSAlan Cox 	    size, 0, shmaddr != NULL ? VMFS_NO_SPACE : VMFS_OPTIMAL_SPACE,
39001a8fb7dSAlan Cox 	    prot, prot, MAP_INHERIT_SHARE | MAP_PREFAULT_PARTIAL);
391a51f7119SJohn Dyson 	if (rv != KERN_SUCCESS) {
392b648d480SJohn Baldwin 		vm_object_deallocate(shmseg->object);
3930555fb35SKonstantin Belousov 		return (ENOMEM);
394a51f7119SJohn Dyson 	}
3950463028cSJohn Dyson 
3963d903220SDoug Rabson 	shmmap_s->va = attach_va;
397f130dcf2SMartin Blapp 	shmmap_s->shmid = shmid;
398921d05b9SRobert Watson 	shmseg->u.shm_lpid = p->p_pid;
399921d05b9SRobert Watson 	shmseg->u.shm_atime = time_second;
400921d05b9SRobert Watson 	shmseg->u.shm_nattch++;
401b40ce416SJulian Elischer 	td->td_retval[0] = attach_va;
402b6a4b4f9SMatthew Dillon 	return (error);
4033d903220SDoug Rabson }
4043d903220SDoug Rabson 
405f130dcf2SMartin Blapp int
4060555fb35SKonstantin Belousov kern_shmat(struct thread *td, int shmid, const void *shmaddr, int shmflg)
407f130dcf2SMartin Blapp {
4080555fb35SKonstantin Belousov 	int error;
4090555fb35SKonstantin Belousov 
4100555fb35SKonstantin Belousov 	SYSVSHM_LOCK();
4110555fb35SKonstantin Belousov 	error = kern_shmat_locked(td, shmid, shmaddr, shmflg);
4120555fb35SKonstantin Belousov 	SYSVSHM_UNLOCK();
4130555fb35SKonstantin Belousov 	return (error);
414f130dcf2SMartin Blapp }
415f130dcf2SMartin Blapp 
4160555fb35SKonstantin Belousov #ifndef _SYS_SYSPROTO_H_
4170555fb35SKonstantin Belousov struct shmat_args {
418f130dcf2SMartin Blapp 	int shmid;
4190555fb35SKonstantin Belousov 	const void *shmaddr;
4200555fb35SKonstantin Belousov 	int shmflg;
4210555fb35SKonstantin Belousov };
4220555fb35SKonstantin Belousov #endif
4230555fb35SKonstantin Belousov int
4240555fb35SKonstantin Belousov sys_shmat(struct thread *td, struct shmat_args *uap)
4253d903220SDoug Rabson {
4260555fb35SKonstantin Belousov 
4270555fb35SKonstantin Belousov 	return (kern_shmat(td, uap->shmid, uap->shmaddr, uap->shmflg));
4280555fb35SKonstantin Belousov }
4290555fb35SKonstantin Belousov 
4300555fb35SKonstantin Belousov static int
4310555fb35SKonstantin Belousov kern_shmctl_locked(struct thread *td, int shmid, int cmd, void *buf,
4320555fb35SKonstantin Belousov     size_t *bufsz)
4330555fb35SKonstantin Belousov {
434921d05b9SRobert Watson 	struct shmid_kernel *shmseg;
4350555fb35SKonstantin Belousov 	struct shmid_ds *shmidp;
4360555fb35SKonstantin Belousov 	struct shm_info shm_info;
4370555fb35SKonstantin Belousov 	int error;
4380555fb35SKonstantin Belousov 
4390555fb35SKonstantin Belousov 	SYSVSHM_ASSERT_LOCKED();
4403d903220SDoug Rabson 
4410304c731SJamie Gritton 	if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
442c6f55f33SJohn Baldwin 		return (ENOSYS);
443f130dcf2SMartin Blapp 
444f130dcf2SMartin Blapp 	switch (cmd) {
4454f18813fSChristian S.J. Peron 	/*
4464f18813fSChristian S.J. Peron 	 * It is possible that kern_shmctl is being called from the Linux ABI
4474f18813fSChristian S.J. Peron 	 * layer, in which case, we will need to implement IPC_INFO.  It should
4484f18813fSChristian S.J. Peron 	 * be noted that other shmctl calls will be funneled through here for
4494f18813fSChristian S.J. Peron 	 * Linix binaries as well.
4504f18813fSChristian S.J. Peron 	 *
4514f18813fSChristian S.J. Peron 	 * NB: The Linux ABI layer will convert this data to structure(s) more
4524f18813fSChristian S.J. Peron 	 * consistent with the Linux ABI.
4534f18813fSChristian S.J. Peron 	 */
454491dec93SMichael Reifenberger 	case IPC_INFO:
455f130dcf2SMartin Blapp 		memcpy(buf, &shminfo, sizeof(shminfo));
456f130dcf2SMartin Blapp 		if (bufsz)
457f130dcf2SMartin Blapp 			*bufsz = sizeof(shminfo);
458491dec93SMichael Reifenberger 		td->td_retval[0] = shmalloced;
4590555fb35SKonstantin Belousov 		return (0);
460491dec93SMichael Reifenberger 	case SHM_INFO: {
461491dec93SMichael Reifenberger 		shm_info.used_ids = shm_nused;
462491dec93SMichael Reifenberger 		shm_info.shm_rss = 0;	/*XXX where to get from ? */
463491dec93SMichael Reifenberger 		shm_info.shm_tot = 0;	/*XXX where to get from ? */
464491dec93SMichael Reifenberger 		shm_info.shm_swp = 0;	/*XXX where to get from ? */
465491dec93SMichael Reifenberger 		shm_info.swap_attempts = 0;	/*XXX where to get from ? */
466491dec93SMichael Reifenberger 		shm_info.swap_successes = 0;	/*XXX where to get from ? */
467f130dcf2SMartin Blapp 		memcpy(buf, &shm_info, sizeof(shm_info));
4680555fb35SKonstantin Belousov 		if (bufsz != NULL)
469f130dcf2SMartin Blapp 			*bufsz = sizeof(shm_info);
470491dec93SMichael Reifenberger 		td->td_retval[0] = shmalloced;
4710555fb35SKonstantin Belousov 		return (0);
472491dec93SMichael Reifenberger 	}
473491dec93SMichael Reifenberger 	}
4740555fb35SKonstantin Belousov 	shmseg = shm_find_segment(shmid, cmd != SHM_STAT);
4750555fb35SKonstantin Belousov 	if (shmseg == NULL)
4760555fb35SKonstantin Belousov 		return (EINVAL);
47714cedfc8SRobert Watson #ifdef MAC
47830d239bcSRobert Watson 	error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, cmd);
479f50c4fd8SRobert Watson 	if (error != 0)
4800555fb35SKonstantin Belousov 		return (error);
48114cedfc8SRobert Watson #endif
482f130dcf2SMartin Blapp 	switch (cmd) {
483491dec93SMichael Reifenberger 	case SHM_STAT:
4843d903220SDoug Rabson 	case IPC_STAT:
485921d05b9SRobert Watson 		error = ipcperm(td, &shmseg->u.shm_perm, IPC_R);
4860555fb35SKonstantin Belousov 		if (error != 0)
4870555fb35SKonstantin Belousov 			return (error);
488921d05b9SRobert Watson 		memcpy(buf, &shmseg->u, sizeof(struct shmid_ds));
4890555fb35SKonstantin Belousov 		if (bufsz != NULL)
490f130dcf2SMartin Blapp 			*bufsz = sizeof(struct shmid_ds);
4910555fb35SKonstantin Belousov 		if (cmd == SHM_STAT) {
4920555fb35SKonstantin Belousov 			td->td_retval[0] = IXSEQ_TO_IPCID(shmid,
4930555fb35SKonstantin Belousov 			    shmseg->u.shm_perm);
4940555fb35SKonstantin Belousov 		}
4953d903220SDoug Rabson 		break;
4960555fb35SKonstantin Belousov 	case IPC_SET:
4970555fb35SKonstantin Belousov 		shmidp = (struct shmid_ds *)buf;
498921d05b9SRobert Watson 		error = ipcperm(td, &shmseg->u.shm_perm, IPC_M);
4990555fb35SKonstantin Belousov 		if (error != 0)
5000555fb35SKonstantin Belousov 			return (error);
5010555fb35SKonstantin Belousov 		shmseg->u.shm_perm.uid = shmidp->shm_perm.uid;
5020555fb35SKonstantin Belousov 		shmseg->u.shm_perm.gid = shmidp->shm_perm.gid;
503921d05b9SRobert Watson 		shmseg->u.shm_perm.mode =
504921d05b9SRobert Watson 		    (shmseg->u.shm_perm.mode & ~ACCESSPERMS) |
5050555fb35SKonstantin Belousov 		    (shmidp->shm_perm.mode & ACCESSPERMS);
506921d05b9SRobert Watson 		shmseg->u.shm_ctime = time_second;
5073d903220SDoug Rabson 		break;
5083d903220SDoug Rabson 	case IPC_RMID:
509921d05b9SRobert Watson 		error = ipcperm(td, &shmseg->u.shm_perm, IPC_M);
5100555fb35SKonstantin Belousov 		if (error != 0)
5110555fb35SKonstantin Belousov 			return (error);
512921d05b9SRobert Watson 		shmseg->u.shm_perm.key = IPC_PRIVATE;
513921d05b9SRobert Watson 		shmseg->u.shm_perm.mode |= SHMSEG_REMOVED;
514921d05b9SRobert Watson 		if (shmseg->u.shm_nattch <= 0) {
5153d903220SDoug Rabson 			shm_deallocate_segment(shmseg);
516f130dcf2SMartin Blapp 			shm_last_free = IPCID_TO_IX(shmid);
5173d903220SDoug Rabson 		}
5183d903220SDoug Rabson 		break;
5193d903220SDoug Rabson #if 0
5203d903220SDoug Rabson 	case SHM_LOCK:
5213d903220SDoug Rabson 	case SHM_UNLOCK:
5223d903220SDoug Rabson #endif
5233d903220SDoug Rabson 	default:
524b6a4b4f9SMatthew Dillon 		error = EINVAL;
525b6a4b4f9SMatthew Dillon 		break;
5263d903220SDoug Rabson 	}
527b6a4b4f9SMatthew Dillon 	return (error);
5283d903220SDoug Rabson }
5293d903220SDoug Rabson 
5300555fb35SKonstantin Belousov int
5310555fb35SKonstantin Belousov kern_shmctl(struct thread *td, int shmid, int cmd, void *buf, size_t *bufsz)
5320555fb35SKonstantin Belousov {
5330555fb35SKonstantin Belousov 	int error;
5340555fb35SKonstantin Belousov 
5350555fb35SKonstantin Belousov 	SYSVSHM_LOCK();
5360555fb35SKonstantin Belousov 	error = kern_shmctl_locked(td, shmid, cmd, buf, bufsz);
5370555fb35SKonstantin Belousov 	SYSVSHM_UNLOCK();
5380555fb35SKonstantin Belousov 	return (error);
5390555fb35SKonstantin Belousov }
5400555fb35SKonstantin Belousov 
5410555fb35SKonstantin Belousov 
54271361470SJohn Baldwin #ifndef _SYS_SYSPROTO_H_
54371361470SJohn Baldwin struct shmctl_args {
54471361470SJohn Baldwin 	int shmid;
54571361470SJohn Baldwin 	int cmd;
54671361470SJohn Baldwin 	struct shmid_ds *buf;
54771361470SJohn Baldwin };
54871361470SJohn Baldwin #endif
549f130dcf2SMartin Blapp int
5500555fb35SKonstantin Belousov sys_shmctl(struct thread *td, struct shmctl_args *uap)
551f130dcf2SMartin Blapp {
552e2f5418eSMateusz Guzik 	int error;
553f130dcf2SMartin Blapp 	struct shmid_ds buf;
554f130dcf2SMartin Blapp 	size_t bufsz;
555f130dcf2SMartin Blapp 
5564f18813fSChristian S.J. Peron 	/*
5574f18813fSChristian S.J. Peron 	 * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support
5584f18813fSChristian S.J. Peron 	 * Linux binaries.  If we see the call come through the FreeBSD ABI,
5594f18813fSChristian S.J. Peron 	 * return an error back to the user since we do not to support this.
5604f18813fSChristian S.J. Peron 	 */
5614f18813fSChristian S.J. Peron 	if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO ||
5624f18813fSChristian S.J. Peron 	    uap->cmd == SHM_STAT)
5634f18813fSChristian S.J. Peron 		return (EINVAL);
5644f18813fSChristian S.J. Peron 
565f130dcf2SMartin Blapp 	/* IPC_SET needs to copyin the buffer before calling kern_shmctl */
566f130dcf2SMartin Blapp 	if (uap->cmd == IPC_SET) {
567f130dcf2SMartin Blapp 		if ((error = copyin(uap->buf, &buf, sizeof(struct shmid_ds))))
568f130dcf2SMartin Blapp 			goto done;
569f130dcf2SMartin Blapp 	}
570f130dcf2SMartin Blapp 
5712332251cSMax Khon 	error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz);
572f130dcf2SMartin Blapp 	if (error)
573f130dcf2SMartin Blapp 		goto done;
574f130dcf2SMartin Blapp 
575f130dcf2SMartin Blapp 	/* Cases in which we need to copyout */
576f130dcf2SMartin Blapp 	switch (uap->cmd) {
577f130dcf2SMartin Blapp 	case IPC_STAT:
578f130dcf2SMartin Blapp 		error = copyout(&buf, uap->buf, bufsz);
579f130dcf2SMartin Blapp 		break;
580f130dcf2SMartin Blapp 	}
581f130dcf2SMartin Blapp 
582f130dcf2SMartin Blapp done:
583f130dcf2SMartin Blapp 	if (error) {
584f130dcf2SMartin Blapp 		/* Invalidate the return value */
585f130dcf2SMartin Blapp 		td->td_retval[0] = -1;
586f130dcf2SMartin Blapp 	}
587f130dcf2SMartin Blapp 	return (error);
588f130dcf2SMartin Blapp }
589f130dcf2SMartin Blapp 
590f130dcf2SMartin Blapp 
5913d903220SDoug Rabson static int
5920555fb35SKonstantin Belousov shmget_existing(struct thread *td, struct shmget_args *uap, int mode,
5930555fb35SKonstantin Belousov     int segnum)
5943d903220SDoug Rabson {
595921d05b9SRobert Watson 	struct shmid_kernel *shmseg;
596d8d2f476SOlivier Houchard #ifdef MAC
5973d903220SDoug Rabson 	int error;
598d8d2f476SOlivier Houchard #endif
5993d903220SDoug Rabson 
6000555fb35SKonstantin Belousov 	SYSVSHM_ASSERT_LOCKED();
6010555fb35SKonstantin Belousov 	KASSERT(segnum >= 0 && segnum < shmalloced,
6020555fb35SKonstantin Belousov 	    ("segnum %d shmalloced %d", segnum, shmalloced));
6033d903220SDoug Rabson 	shmseg = &shmsegs[segnum];
604dc92aa57SAlan Cox 	if ((uap->shmflg & (IPC_CREAT | IPC_EXCL)) == (IPC_CREAT | IPC_EXCL))
605b618bb96SAlfred Perlstein 		return (EEXIST);
60614cedfc8SRobert Watson #ifdef MAC
60730d239bcSRobert Watson 	error = mac_sysvshm_check_shmget(td->td_ucred, shmseg, uap->shmflg);
608f50c4fd8SRobert Watson 	if (error != 0)
6097723d5edSRobert Watson 		return (error);
61014cedfc8SRobert Watson #endif
611b648d480SJohn Baldwin 	if (uap->size != 0 && uap->size > shmseg->u.shm_segsz)
612b618bb96SAlfred Perlstein 		return (EINVAL);
613921d05b9SRobert Watson 	td->td_retval[0] = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm);
614b618bb96SAlfred Perlstein 	return (0);
6153d903220SDoug Rabson }
6163d903220SDoug Rabson 
6173d903220SDoug Rabson static int
6180555fb35SKonstantin Belousov shmget_allocate_segment(struct thread *td, struct shmget_args *uap, int mode)
6193d903220SDoug Rabson {
620a854ed98SJohn Baldwin 	struct ucred *cred = td->td_ucred;
621921d05b9SRobert Watson 	struct shmid_kernel *shmseg;
6220049f8b2SAlan Cox 	vm_object_t shm_object;
6230555fb35SKonstantin Belousov 	int i, segnum;
6240555fb35SKonstantin Belousov 	size_t size;
6253d903220SDoug Rabson 
6260555fb35SKonstantin Belousov 	SYSVSHM_ASSERT_LOCKED();
6270cddd8f0SMatthew Dillon 
6283d903220SDoug Rabson 	if (uap->size < shminfo.shmmin || uap->size > shminfo.shmmax)
629b618bb96SAlfred Perlstein 		return (EINVAL);
630028f979dSDima Dorfman 	if (shm_nused >= shminfo.shmmni) /* Any shmids left? */
631b618bb96SAlfred Perlstein 		return (ENOSPC);
6329e609ddeSJoerg Wunsch 	size = round_page(uap->size);
6333d903220SDoug Rabson 	if (shm_committed + btoc(size) > shminfo.shmall)
634b618bb96SAlfred Perlstein 		return (ENOMEM);
6353d903220SDoug Rabson 	if (shm_last_free < 0) {
636028f979dSDima Dorfman 		shmrealloc();	/* Maybe expand the shmsegs[] array. */
637255108f3SPeter Wemm 		for (i = 0; i < shmalloced; i++)
638921d05b9SRobert Watson 			if (shmsegs[i].u.shm_perm.mode & SHMSEG_FREE)
6393d903220SDoug Rabson 				break;
640255108f3SPeter Wemm 		if (i == shmalloced)
641b618bb96SAlfred Perlstein 			return (ENOSPC);
6423d903220SDoug Rabson 		segnum = i;
6433d903220SDoug Rabson 	} else  {
6443d903220SDoug Rabson 		segnum = shm_last_free;
6453d903220SDoug Rabson 		shm_last_free = -1;
6463d903220SDoug Rabson 	}
6470555fb35SKonstantin Belousov 	KASSERT(segnum >= 0 && segnum < shmalloced,
6480555fb35SKonstantin Belousov 	    ("segnum %d shmalloced %d", segnum, shmalloced));
6493d903220SDoug Rabson 	shmseg = &shmsegs[segnum];
650afcc55f3SEdward Tomasz Napierala #ifdef RACCT
6514b5c9cf6SEdward Tomasz Napierala 	if (racct_enable) {
6523bcf7445SEdward Tomasz Napierala 		PROC_LOCK(td->td_proc);
6533bcf7445SEdward Tomasz Napierala 		if (racct_add(td->td_proc, RACCT_NSHM, 1)) {
6543bcf7445SEdward Tomasz Napierala 			PROC_UNLOCK(td->td_proc);
6553bcf7445SEdward Tomasz Napierala 			return (ENOSPC);
6563bcf7445SEdward Tomasz Napierala 		}
6573bcf7445SEdward Tomasz Napierala 		if (racct_add(td->td_proc, RACCT_SHMSIZE, size)) {
6583bcf7445SEdward Tomasz Napierala 			racct_sub(td->td_proc, RACCT_NSHM, 1);
6593bcf7445SEdward Tomasz Napierala 			PROC_UNLOCK(td->td_proc);
6603bcf7445SEdward Tomasz Napierala 			return (ENOMEM);
6613bcf7445SEdward Tomasz Napierala 		}
6623bcf7445SEdward Tomasz Napierala 		PROC_UNLOCK(td->td_proc);
6634b5c9cf6SEdward Tomasz Napierala 	}
664afcc55f3SEdward Tomasz Napierala #endif
665a51f7119SJohn Dyson 
666ae9b8c3aSJohn Dyson 	/*
667ae9b8c3aSJohn Dyson 	 * We make sure that we have allocated a pager before we need
668ae9b8c3aSJohn Dyson 	 * to.
669ae9b8c3aSJohn Dyson 	 */
6703364c323SKonstantin Belousov 	shm_object = vm_pager_allocate(shm_use_phys ? OBJT_PHYS : OBJT_SWAP,
6713364c323SKonstantin Belousov 	    0, size, VM_PROT_DEFAULT, 0, cred);
6723bcf7445SEdward Tomasz Napierala 	if (shm_object == NULL) {
673afcc55f3SEdward Tomasz Napierala #ifdef RACCT
6744b5c9cf6SEdward Tomasz Napierala 		if (racct_enable) {
6753bcf7445SEdward Tomasz Napierala 			PROC_LOCK(td->td_proc);
6763bcf7445SEdward Tomasz Napierala 			racct_sub(td->td_proc, RACCT_NSHM, 1);
6773bcf7445SEdward Tomasz Napierala 			racct_sub(td->td_proc, RACCT_SHMSIZE, size);
6783bcf7445SEdward Tomasz Napierala 			PROC_UNLOCK(td->td_proc);
6794b5c9cf6SEdward Tomasz Napierala 		}
680afcc55f3SEdward Tomasz Napierala #endif
6813364c323SKonstantin Belousov 		return (ENOMEM);
6823bcf7445SEdward Tomasz Napierala 	}
683c2d5d3eeSAlan Cox 	shm_object->pg_color = 0;
68489f6b863SAttilio Rao 	VM_OBJECT_WLOCK(shm_object);
6850049f8b2SAlan Cox 	vm_object_clear_flag(shm_object, OBJ_ONEMAPPING);
686c2d5d3eeSAlan Cox 	vm_object_set_flag(shm_object, OBJ_COLORED | OBJ_NOSPLIT);
68789f6b863SAttilio Rao 	VM_OBJECT_WUNLOCK(shm_object);
688cbd8ec09SJohn Dyson 
689b648d480SJohn Baldwin 	shmseg->object = shm_object;
690921d05b9SRobert Watson 	shmseg->u.shm_perm.cuid = shmseg->u.shm_perm.uid = cred->cr_uid;
691921d05b9SRobert Watson 	shmseg->u.shm_perm.cgid = shmseg->u.shm_perm.gid = cred->cr_gid;
6920555fb35SKonstantin Belousov 	shmseg->u.shm_perm.mode = (mode & ACCESSPERMS) | SHMSEG_ALLOCATED;
6930555fb35SKonstantin Belousov 	shmseg->u.shm_perm.key = uap->key;
6940555fb35SKonstantin Belousov 	shmseg->u.shm_perm.seq = (shmseg->u.shm_perm.seq + 1) & 0x7fff;
695b1fb5f9cSEdward Tomasz Napierala 	shmseg->cred = crhold(cred);
696921d05b9SRobert Watson 	shmseg->u.shm_segsz = uap->size;
697921d05b9SRobert Watson 	shmseg->u.shm_cpid = td->td_proc->p_pid;
698921d05b9SRobert Watson 	shmseg->u.shm_lpid = shmseg->u.shm_nattch = 0;
699921d05b9SRobert Watson 	shmseg->u.shm_atime = shmseg->u.shm_dtime = 0;
70014cedfc8SRobert Watson #ifdef MAC
70130d239bcSRobert Watson 	mac_sysvshm_create(cred, shmseg);
70214cedfc8SRobert Watson #endif
703921d05b9SRobert Watson 	shmseg->u.shm_ctime = time_second;
7043d903220SDoug Rabson 	shm_committed += btoc(size);
7053d903220SDoug Rabson 	shm_nused++;
7060555fb35SKonstantin Belousov 	td->td_retval[0] = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm);
7070555fb35SKonstantin Belousov 
708b618bb96SAlfred Perlstein 	return (0);
7093d903220SDoug Rabson }
7103d903220SDoug Rabson 
71171361470SJohn Baldwin #ifndef _SYS_SYSPROTO_H_
71271361470SJohn Baldwin struct shmget_args {
71371361470SJohn Baldwin 	key_t key;
71471361470SJohn Baldwin 	size_t size;
71571361470SJohn Baldwin 	int shmflg;
71671361470SJohn Baldwin };
71771361470SJohn Baldwin #endif
7183d903220SDoug Rabson int
7190555fb35SKonstantin Belousov sys_shmget(struct thread *td, struct shmget_args *uap)
7203d903220SDoug Rabson {
721b6a4b4f9SMatthew Dillon 	int segnum, mode;
722b6a4b4f9SMatthew Dillon 	int error;
7233d903220SDoug Rabson 
7240304c731SJamie Gritton 	if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
725c6f55f33SJohn Baldwin 		return (ENOSYS);
7263d903220SDoug Rabson 	mode = uap->shmflg & ACCESSPERMS;
7270555fb35SKonstantin Belousov 	SYSVSHM_LOCK();
7280555fb35SKonstantin Belousov 	if (uap->key == IPC_PRIVATE) {
729b40ce416SJulian Elischer 		error = shmget_allocate_segment(td, uap, mode);
7300555fb35SKonstantin Belousov 	} else {
7310555fb35SKonstantin Belousov 		segnum = shm_find_segment_by_key(uap->key);
7320555fb35SKonstantin Belousov 		if (segnum >= 0)
7330555fb35SKonstantin Belousov 			error = shmget_existing(td, uap, mode, segnum);
7340555fb35SKonstantin Belousov 		else if ((uap->shmflg & IPC_CREAT) == 0)
7350555fb35SKonstantin Belousov 			error = ENOENT;
7360555fb35SKonstantin Belousov 		else
7370555fb35SKonstantin Belousov 			error = shmget_allocate_segment(td, uap, mode);
7380555fb35SKonstantin Belousov 	}
7390555fb35SKonstantin Belousov 	SYSVSHM_UNLOCK();
740b6a4b4f9SMatthew Dillon 	return (error);
7413d903220SDoug Rabson }
7423d903220SDoug Rabson 
74378525ce3SAlfred Perlstein static void
7440555fb35SKonstantin Belousov shmfork_myhook(struct proc *p1, struct proc *p2)
7453d903220SDoug Rabson {
7463d903220SDoug Rabson 	struct shmmap_state *shmmap_s;
7473d903220SDoug Rabson 	size_t size;
7483d903220SDoug Rabson 	int i;
7493d903220SDoug Rabson 
7500555fb35SKonstantin Belousov 	SYSVSHM_LOCK();
7513d903220SDoug Rabson 	size = shminfo.shmseg * sizeof(struct shmmap_state);
752a163d034SWarner Losh 	shmmap_s = malloc(size, M_SHM, M_WAITOK);
7532cc593fdSAlfred Perlstein 	bcopy(p1->p_vmspace->vm_shm, shmmap_s, size);
7542cc593fdSAlfred Perlstein 	p2->p_vmspace->vm_shm = shmmap_s;
7550555fb35SKonstantin Belousov 	for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) {
7560555fb35SKonstantin Belousov 		if (shmmap_s->shmid != -1) {
7570555fb35SKonstantin Belousov 			KASSERT(IPCID_TO_IX(shmmap_s->shmid) >= 0 &&
7580555fb35SKonstantin Belousov 			    IPCID_TO_IX(shmmap_s->shmid) < shmalloced,
7590555fb35SKonstantin Belousov 			    ("segnum %d shmalloced %d",
7600555fb35SKonstantin Belousov 			    IPCID_TO_IX(shmmap_s->shmid), shmalloced));
761921d05b9SRobert Watson 			shmsegs[IPCID_TO_IX(shmmap_s->shmid)].u.shm_nattch++;
7620555fb35SKonstantin Belousov 		}
7630555fb35SKonstantin Belousov 	}
7640555fb35SKonstantin Belousov 	SYSVSHM_UNLOCK();
7653d903220SDoug Rabson }
7663d903220SDoug Rabson 
76778525ce3SAlfred Perlstein static void
7683db161e0SMatthew Dillon shmexit_myhook(struct vmspace *vm)
7693d903220SDoug Rabson {
7703db161e0SMatthew Dillon 	struct shmmap_state *base, *shm;
7713d903220SDoug Rabson 	int i;
7723d903220SDoug Rabson 
7730555fb35SKonstantin Belousov 	base = vm->vm_shm;
7740555fb35SKonstantin Belousov 	if (base != NULL) {
7753db161e0SMatthew Dillon 		vm->vm_shm = NULL;
7760555fb35SKonstantin Belousov 		SYSVSHM_LOCK();
7773db161e0SMatthew Dillon 		for (i = 0, shm = base; i < shminfo.shmseg; i++, shm++) {
7783db161e0SMatthew Dillon 			if (shm->shmid != -1)
7793db161e0SMatthew Dillon 				shm_delete_mapping(vm, shm);
7803db161e0SMatthew Dillon 		}
7810555fb35SKonstantin Belousov 		SYSVSHM_UNLOCK();
7823db161e0SMatthew Dillon 		free(base, M_SHM);
7833db161e0SMatthew Dillon 	}
7843d903220SDoug Rabson }
7853d903220SDoug Rabson 
786255108f3SPeter Wemm static void
787255108f3SPeter Wemm shmrealloc(void)
788255108f3SPeter Wemm {
789921d05b9SRobert Watson 	struct shmid_kernel *newsegs;
7900555fb35SKonstantin Belousov 	int i;
7910555fb35SKonstantin Belousov 
7920555fb35SKonstantin Belousov 	SYSVSHM_ASSERT_LOCKED();
793255108f3SPeter Wemm 
794255108f3SPeter Wemm 	if (shmalloced >= shminfo.shmmni)
795255108f3SPeter Wemm 		return;
796255108f3SPeter Wemm 
797a163d034SWarner Losh 	newsegs = malloc(shminfo.shmmni * sizeof(*newsegs), M_SHM, M_WAITOK);
798255108f3SPeter Wemm 	for (i = 0; i < shmalloced; i++)
799255108f3SPeter Wemm 		bcopy(&shmsegs[i], &newsegs[i], sizeof(newsegs[0]));
800255108f3SPeter Wemm 	for (; i < shminfo.shmmni; i++) {
8010be3a191SMateusz Guzik 		newsegs[i].u.shm_perm.mode = SHMSEG_FREE;
8020be3a191SMateusz Guzik 		newsegs[i].u.shm_perm.seq = 0;
80314cedfc8SRobert Watson #ifdef MAC
8040be3a191SMateusz Guzik 		mac_sysvshm_init(&newsegs[i]);
80514cedfc8SRobert Watson #endif
806255108f3SPeter Wemm 	}
807255108f3SPeter Wemm 	free(shmsegs, M_SHM);
808255108f3SPeter Wemm 	shmsegs = newsegs;
809255108f3SPeter Wemm 	shmalloced = shminfo.shmmni;
810255108f3SPeter Wemm }
811255108f3SPeter Wemm 
81275d633cbSKonstantin Belousov static struct syscall_helper_data shm_syscalls[] = {
81375d633cbSKonstantin Belousov 	SYSCALL_INIT_HELPER(shmat),
81475d633cbSKonstantin Belousov 	SYSCALL_INIT_HELPER(shmctl),
81575d633cbSKonstantin Belousov 	SYSCALL_INIT_HELPER(shmdt),
81675d633cbSKonstantin Belousov 	SYSCALL_INIT_HELPER(shmget),
81775d633cbSKonstantin Belousov #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
81875d633cbSKonstantin Belousov     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
8198451d0ddSKip Macy 	SYSCALL_INIT_HELPER_COMPAT(freebsd7_shmctl),
82075d633cbSKonstantin Belousov #endif
82175d633cbSKonstantin Belousov #if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43))
82275d633cbSKonstantin Belousov 	SYSCALL_INIT_HELPER(shmsys),
82375d633cbSKonstantin Belousov #endif
82475d633cbSKonstantin Belousov 	SYSCALL_INIT_LAST
82575d633cbSKonstantin Belousov };
82675d633cbSKonstantin Belousov 
82775d633cbSKonstantin Belousov #ifdef COMPAT_FREEBSD32
82875d633cbSKonstantin Belousov #include <compat/freebsd32/freebsd32.h>
82975d633cbSKonstantin Belousov #include <compat/freebsd32/freebsd32_ipc.h>
83075d633cbSKonstantin Belousov #include <compat/freebsd32/freebsd32_proto.h>
83175d633cbSKonstantin Belousov #include <compat/freebsd32/freebsd32_signal.h>
83275d633cbSKonstantin Belousov #include <compat/freebsd32/freebsd32_syscall.h>
83375d633cbSKonstantin Belousov #include <compat/freebsd32/freebsd32_util.h>
83475d633cbSKonstantin Belousov 
83575d633cbSKonstantin Belousov static struct syscall_helper_data shm32_syscalls[] = {
8368451d0ddSKip Macy 	SYSCALL32_INIT_HELPER_COMPAT(shmat),
8378451d0ddSKip Macy 	SYSCALL32_INIT_HELPER_COMPAT(shmdt),
8388451d0ddSKip Macy 	SYSCALL32_INIT_HELPER_COMPAT(shmget),
83975d633cbSKonstantin Belousov 	SYSCALL32_INIT_HELPER(freebsd32_shmsys),
84075d633cbSKonstantin Belousov 	SYSCALL32_INIT_HELPER(freebsd32_shmctl),
84175d633cbSKonstantin Belousov #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
84275d633cbSKonstantin Belousov     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
84375d633cbSKonstantin Belousov 	SYSCALL32_INIT_HELPER(freebsd7_freebsd32_shmctl),
84475d633cbSKonstantin Belousov #endif
84575d633cbSKonstantin Belousov 	SYSCALL_INIT_LAST
84675d633cbSKonstantin Belousov };
84775d633cbSKonstantin Belousov #endif
84875d633cbSKonstantin Belousov 
84975d633cbSKonstantin Belousov static int
8500555fb35SKonstantin Belousov shminit(void)
8513d903220SDoug Rabson {
85275d633cbSKonstantin Belousov 	int i, error;
853255108f3SPeter Wemm 
8544d9d1e82SRuslan Ermilov #ifndef BURN_BRIDGES
8554d9d1e82SRuslan Ermilov 	if (TUNABLE_ULONG_FETCH("kern.ipc.shmmaxpgs", &shminfo.shmall) != 0)
8564d9d1e82SRuslan Ermilov 		printf("kern.ipc.shmmaxpgs is now called kern.ipc.shmall!\n");
8574d9d1e82SRuslan Ermilov #endif
858af3b2549SHans Petter Selasky 	if (shminfo.shmmax == SHMMAX) {
8594d9d1e82SRuslan Ermilov 		/* Initialize shmmax dealing with possible overflow. */
860af3b2549SHans Petter Selasky 		for (i = PAGE_SIZE; i != 0; i--) {
861a4c24c66SJohn Baldwin 			shminfo.shmmax = shminfo.shmall * i;
862af3b2549SHans Petter Selasky 			if ((shminfo.shmmax / shminfo.shmall) == (u_long)i)
8635015c68aSAlfred Perlstein 				break;
8645015c68aSAlfred Perlstein 		}
86512075c09SPawel Jakub Dawidek 	}
866255108f3SPeter Wemm 	shmalloced = shminfo.shmmni;
867a163d034SWarner Losh 	shmsegs = malloc(shmalloced * sizeof(shmsegs[0]), M_SHM, M_WAITOK);
868255108f3SPeter Wemm 	for (i = 0; i < shmalloced; i++) {
869921d05b9SRobert Watson 		shmsegs[i].u.shm_perm.mode = SHMSEG_FREE;
870921d05b9SRobert Watson 		shmsegs[i].u.shm_perm.seq = 0;
87114cedfc8SRobert Watson #ifdef MAC
87230d239bcSRobert Watson 		mac_sysvshm_init(&shmsegs[i]);
87314cedfc8SRobert Watson #endif
8743d903220SDoug Rabson 	}
8753d903220SDoug Rabson 	shm_last_free = 0;
8763d903220SDoug Rabson 	shm_nused = 0;
8773d903220SDoug Rabson 	shm_committed = 0;
8780555fb35SKonstantin Belousov 	sx_init(&sysvshmsx, "sysvshmsx");
87978525ce3SAlfred Perlstein 	shmexit_hook = &shmexit_myhook;
88078525ce3SAlfred Perlstein 	shmfork_hook = &shmfork_myhook;
88175d633cbSKonstantin Belousov 
882e015b1abSMateusz Guzik 	error = syscall_helper_register(shm_syscalls, SY_THR_STATIC_KLD);
88375d633cbSKonstantin Belousov 	if (error != 0)
88475d633cbSKonstantin Belousov 		return (error);
88575d633cbSKonstantin Belousov #ifdef COMPAT_FREEBSD32
886e015b1abSMateusz Guzik 	error = syscall32_helper_register(shm32_syscalls, SY_THR_STATIC_KLD);
88775d633cbSKonstantin Belousov 	if (error != 0)
88875d633cbSKonstantin Belousov 		return (error);
88975d633cbSKonstantin Belousov #endif
89075d633cbSKonstantin Belousov 	return (0);
8913d903220SDoug Rabson }
89278525ce3SAlfred Perlstein 
89378525ce3SAlfred Perlstein static int
8940555fb35SKonstantin Belousov shmunload(void)
89578525ce3SAlfred Perlstein {
89614cedfc8SRobert Watson 	int i;
89778525ce3SAlfred Perlstein 
89878525ce3SAlfred Perlstein 	if (shm_nused > 0)
89978525ce3SAlfred Perlstein 		return (EBUSY);
90078525ce3SAlfred Perlstein 
90175d633cbSKonstantin Belousov #ifdef COMPAT_FREEBSD32
90275d633cbSKonstantin Belousov 	syscall32_helper_unregister(shm32_syscalls);
90375d633cbSKonstantin Belousov #endif
90475d633cbSKonstantin Belousov 	syscall_helper_unregister(shm_syscalls);
90575d633cbSKonstantin Belousov 
9060d9d996dSKonstantin Belousov 	for (i = 0; i < shmalloced; i++) {
90714cedfc8SRobert Watson #ifdef MAC
90830d239bcSRobert Watson 		mac_sysvshm_destroy(&shmsegs[i]);
90914cedfc8SRobert Watson #endif
9100d9d996dSKonstantin Belousov 		/*
9110d9d996dSKonstantin Belousov 		 * Objects might be still mapped into the processes
9120d9d996dSKonstantin Belousov 		 * address spaces.  Actual free would happen on the
9130d9d996dSKonstantin Belousov 		 * last mapping destruction.
9140d9d996dSKonstantin Belousov 		 */
9150d9d996dSKonstantin Belousov 		if (shmsegs[i].u.shm_perm.mode != SHMSEG_FREE)
9160d9d996dSKonstantin Belousov 			vm_object_deallocate(shmsegs[i].object);
9170d9d996dSKonstantin Belousov 	}
91878525ce3SAlfred Perlstein 	free(shmsegs, M_SHM);
91978525ce3SAlfred Perlstein 	shmexit_hook = NULL;
92078525ce3SAlfred Perlstein 	shmfork_hook = NULL;
9210555fb35SKonstantin Belousov 	sx_destroy(&sysvshmsx);
92278525ce3SAlfred Perlstein 	return (0);
92378525ce3SAlfred Perlstein }
92478525ce3SAlfred Perlstein 
92578525ce3SAlfred Perlstein static int
926a723c4e1SDima Dorfman sysctl_shmsegs(SYSCTL_HANDLER_ARGS)
927a723c4e1SDima Dorfman {
9280555fb35SKonstantin Belousov 	int error;
929a723c4e1SDima Dorfman 
9300555fb35SKonstantin Belousov 	SYSVSHM_LOCK();
9310555fb35SKonstantin Belousov 	error = SYSCTL_OUT(req, shmsegs, shmalloced * sizeof(shmsegs[0]));
9320555fb35SKonstantin Belousov 	SYSVSHM_UNLOCK();
9330555fb35SKonstantin Belousov 	return (error);
934a723c4e1SDima Dorfman }
935a723c4e1SDima Dorfman 
93645f48220SJohn Baldwin #if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43))
93745f48220SJohn Baldwin struct oshmid_ds {
93845f48220SJohn Baldwin 	struct	ipc_perm_old shm_perm;	/* operation perms */
93945f48220SJohn Baldwin 	int	shm_segsz;		/* size of segment (bytes) */
94045f48220SJohn Baldwin 	u_short	shm_cpid;		/* pid, creator */
94145f48220SJohn Baldwin 	u_short	shm_lpid;		/* pid, last operation */
94245f48220SJohn Baldwin 	short	shm_nattch;		/* no. of current attaches */
94345f48220SJohn Baldwin 	time_t	shm_atime;		/* last attach time */
94445f48220SJohn Baldwin 	time_t	shm_dtime;		/* last detach time */
94545f48220SJohn Baldwin 	time_t	shm_ctime;		/* last change time */
94645f48220SJohn Baldwin 	void	*shm_handle;		/* internal handle for shm segment */
94745f48220SJohn Baldwin };
94845f48220SJohn Baldwin 
94945f48220SJohn Baldwin struct oshmctl_args {
95045f48220SJohn Baldwin 	int shmid;
95145f48220SJohn Baldwin 	int cmd;
95245f48220SJohn Baldwin 	struct oshmid_ds *ubuf;
95345f48220SJohn Baldwin };
95445f48220SJohn Baldwin 
95545f48220SJohn Baldwin static int
956ca998284SJohn Baldwin oshmctl(struct thread *td, struct oshmctl_args *uap)
95745f48220SJohn Baldwin {
95845f48220SJohn Baldwin #ifdef COMPAT_43
95945f48220SJohn Baldwin 	int error = 0;
96045f48220SJohn Baldwin 	struct shmid_kernel *shmseg;
96145f48220SJohn Baldwin 	struct oshmid_ds outbuf;
96245f48220SJohn Baldwin 
96345f48220SJohn Baldwin 	if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
96445f48220SJohn Baldwin 		return (ENOSYS);
965f16f8610SKonstantin Belousov 	if (uap->cmd != IPC_STAT) {
966f16f8610SKonstantin Belousov 		return (freebsd7_shmctl(td,
967f16f8610SKonstantin Belousov 		    (struct freebsd7_shmctl_args *)uap));
968f16f8610SKonstantin Belousov 	}
9690555fb35SKonstantin Belousov 	SYSVSHM_LOCK();
9700555fb35SKonstantin Belousov 	shmseg = shm_find_segment(uap->shmid, true);
97145f48220SJohn Baldwin 	if (shmseg == NULL) {
9720555fb35SKonstantin Belousov 		SYSVSHM_UNLOCK();
9734cfc037cSKonstantin Belousov 		return (EINVAL);
97445f48220SJohn Baldwin 	}
97545f48220SJohn Baldwin 	error = ipcperm(td, &shmseg->u.shm_perm, IPC_R);
976f16f8610SKonstantin Belousov 	if (error != 0) {
977f16f8610SKonstantin Belousov 		SYSVSHM_UNLOCK();
978f16f8610SKonstantin Belousov 		return (error);
979f16f8610SKonstantin Belousov 	}
9800555fb35SKonstantin Belousov #ifdef MAC
981f16f8610SKonstantin Belousov 	error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, uap->cmd);
982f16f8610SKonstantin Belousov 	if (error != 0) {
983f16f8610SKonstantin Belousov 		SYSVSHM_UNLOCK();
984f16f8610SKonstantin Belousov 		return (error);
985f16f8610SKonstantin Belousov 	}
98645f48220SJohn Baldwin #endif
98745f48220SJohn Baldwin 	ipcperm_new2old(&shmseg->u.shm_perm, &outbuf.shm_perm);
98845f48220SJohn Baldwin 	outbuf.shm_segsz = shmseg->u.shm_segsz;
98945f48220SJohn Baldwin 	outbuf.shm_cpid = shmseg->u.shm_cpid;
99045f48220SJohn Baldwin 	outbuf.shm_lpid = shmseg->u.shm_lpid;
99145f48220SJohn Baldwin 	outbuf.shm_nattch = shmseg->u.shm_nattch;
99245f48220SJohn Baldwin 	outbuf.shm_atime = shmseg->u.shm_atime;
99345f48220SJohn Baldwin 	outbuf.shm_dtime = shmseg->u.shm_dtime;
99445f48220SJohn Baldwin 	outbuf.shm_ctime = shmseg->u.shm_ctime;
99545f48220SJohn Baldwin 	outbuf.shm_handle = shmseg->object;
9960555fb35SKonstantin Belousov 	SYSVSHM_UNLOCK();
997e2f5418eSMateusz Guzik 	return (copyout(&outbuf, uap->ubuf, sizeof(outbuf)));
99845f48220SJohn Baldwin #else
99945f48220SJohn Baldwin 	return (EINVAL);
100045f48220SJohn Baldwin #endif
100145f48220SJohn Baldwin }
100245f48220SJohn Baldwin 
100345f48220SJohn Baldwin /* XXX casting to (sy_call_t *) is bogus, as usual. */
100445f48220SJohn Baldwin static sy_call_t *shmcalls[] = {
10058451d0ddSKip Macy 	(sy_call_t *)sys_shmat, (sy_call_t *)oshmctl,
10068451d0ddSKip Macy 	(sy_call_t *)sys_shmdt, (sy_call_t *)sys_shmget,
1007b648d480SJohn Baldwin 	(sy_call_t *)freebsd7_shmctl
100845f48220SJohn Baldwin };
100945f48220SJohn Baldwin 
10100555fb35SKonstantin Belousov #ifndef _SYS_SYSPROTO_H_
101145f48220SJohn Baldwin /* XXX actually varargs. */
10120555fb35SKonstantin Belousov struct shmsys_args {
101345f48220SJohn Baldwin 	int	which;
101445f48220SJohn Baldwin 	int	a2;
101545f48220SJohn Baldwin 	int	a3;
101645f48220SJohn Baldwin 	int	a4;
10170555fb35SKonstantin Belousov };
10180555fb35SKonstantin Belousov #endif
10190555fb35SKonstantin Belousov int
10200555fb35SKonstantin Belousov sys_shmsys(struct thread *td, struct shmsys_args *uap)
102145f48220SJohn Baldwin {
102245f48220SJohn Baldwin 
102345f48220SJohn Baldwin 	if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
102445f48220SJohn Baldwin 		return (ENOSYS);
10250555fb35SKonstantin Belousov 	if (uap->which < 0 || uap->which >= nitems(shmcalls))
102645f48220SJohn Baldwin 		return (EINVAL);
1027e2f5418eSMateusz Guzik 	return ((*shmcalls[uap->which])(td, &uap->a2));
102845f48220SJohn Baldwin }
102945f48220SJohn Baldwin 
103045f48220SJohn Baldwin #endif	/* i386 && (COMPAT_FREEBSD4 || COMPAT_43) */
103145f48220SJohn Baldwin 
103275d633cbSKonstantin Belousov #ifdef COMPAT_FREEBSD32
103375d633cbSKonstantin Belousov 
103475d633cbSKonstantin Belousov int
103575d633cbSKonstantin Belousov freebsd32_shmsys(struct thread *td, struct freebsd32_shmsys_args *uap)
103675d633cbSKonstantin Belousov {
103775d633cbSKonstantin Belousov 
103875d633cbSKonstantin Belousov #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
103975d633cbSKonstantin Belousov     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
104075d633cbSKonstantin Belousov 	switch (uap->which) {
104175d633cbSKonstantin Belousov 	case 0:	{	/* shmat */
104275d633cbSKonstantin Belousov 		struct shmat_args ap;
104375d633cbSKonstantin Belousov 
104475d633cbSKonstantin Belousov 		ap.shmid = uap->a2;
104575d633cbSKonstantin Belousov 		ap.shmaddr = PTRIN(uap->a3);
104675d633cbSKonstantin Belousov 		ap.shmflg = uap->a4;
104775d633cbSKonstantin Belousov 		return (sysent[SYS_shmat].sy_call(td, &ap));
104875d633cbSKonstantin Belousov 	}
104975d633cbSKonstantin Belousov 	case 2: {	/* shmdt */
105075d633cbSKonstantin Belousov 		struct shmdt_args ap;
105175d633cbSKonstantin Belousov 
105275d633cbSKonstantin Belousov 		ap.shmaddr = PTRIN(uap->a2);
105375d633cbSKonstantin Belousov 		return (sysent[SYS_shmdt].sy_call(td, &ap));
105475d633cbSKonstantin Belousov 	}
105575d633cbSKonstantin Belousov 	case 3: {	/* shmget */
105675d633cbSKonstantin Belousov 		struct shmget_args ap;
105775d633cbSKonstantin Belousov 
105875d633cbSKonstantin Belousov 		ap.key = uap->a2;
105975d633cbSKonstantin Belousov 		ap.size = uap->a3;
106075d633cbSKonstantin Belousov 		ap.shmflg = uap->a4;
106175d633cbSKonstantin Belousov 		return (sysent[SYS_shmget].sy_call(td, &ap));
106275d633cbSKonstantin Belousov 	}
106375d633cbSKonstantin Belousov 	case 4: {	/* shmctl */
106475d633cbSKonstantin Belousov 		struct freebsd7_freebsd32_shmctl_args ap;
106575d633cbSKonstantin Belousov 
106675d633cbSKonstantin Belousov 		ap.shmid = uap->a2;
106775d633cbSKonstantin Belousov 		ap.cmd = uap->a3;
106875d633cbSKonstantin Belousov 		ap.buf = PTRIN(uap->a4);
106975d633cbSKonstantin Belousov 		return (freebsd7_freebsd32_shmctl(td, &ap));
107075d633cbSKonstantin Belousov 	}
107175d633cbSKonstantin Belousov 	case 1:		/* oshmctl */
107275d633cbSKonstantin Belousov 	default:
107375d633cbSKonstantin Belousov 		return (EINVAL);
107475d633cbSKonstantin Belousov 	}
107575d633cbSKonstantin Belousov #else
107675d633cbSKonstantin Belousov 	return (nosys(td, NULL));
107775d633cbSKonstantin Belousov #endif
107875d633cbSKonstantin Belousov }
107975d633cbSKonstantin Belousov 
108075d633cbSKonstantin Belousov #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
108175d633cbSKonstantin Belousov     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
108275d633cbSKonstantin Belousov int
108375d633cbSKonstantin Belousov freebsd7_freebsd32_shmctl(struct thread *td,
108475d633cbSKonstantin Belousov     struct freebsd7_freebsd32_shmctl_args *uap)
108575d633cbSKonstantin Belousov {
1086e2f5418eSMateusz Guzik 	int error;
108775d633cbSKonstantin Belousov 	union {
108875d633cbSKonstantin Belousov 		struct shmid_ds shmid_ds;
108975d633cbSKonstantin Belousov 		struct shm_info shm_info;
109075d633cbSKonstantin Belousov 		struct shminfo shminfo;
109175d633cbSKonstantin Belousov 	} u;
109275d633cbSKonstantin Belousov 	union {
109375d633cbSKonstantin Belousov 		struct shmid_ds32_old shmid_ds32;
109475d633cbSKonstantin Belousov 		struct shm_info32 shm_info32;
109575d633cbSKonstantin Belousov 		struct shminfo32 shminfo32;
109675d633cbSKonstantin Belousov 	} u32;
109775d633cbSKonstantin Belousov 	size_t sz;
109875d633cbSKonstantin Belousov 
109975d633cbSKonstantin Belousov 	if (uap->cmd == IPC_SET) {
110075d633cbSKonstantin Belousov 		if ((error = copyin(uap->buf, &u32.shmid_ds32,
110175d633cbSKonstantin Belousov 		    sizeof(u32.shmid_ds32))))
110275d633cbSKonstantin Belousov 			goto done;
110375d633cbSKonstantin Belousov 		freebsd32_ipcperm_old_in(&u32.shmid_ds32.shm_perm,
110475d633cbSKonstantin Belousov 		    &u.shmid_ds.shm_perm);
110575d633cbSKonstantin Belousov 		CP(u32.shmid_ds32, u.shmid_ds, shm_segsz);
110675d633cbSKonstantin Belousov 		CP(u32.shmid_ds32, u.shmid_ds, shm_lpid);
110775d633cbSKonstantin Belousov 		CP(u32.shmid_ds32, u.shmid_ds, shm_cpid);
110875d633cbSKonstantin Belousov 		CP(u32.shmid_ds32, u.shmid_ds, shm_nattch);
110975d633cbSKonstantin Belousov 		CP(u32.shmid_ds32, u.shmid_ds, shm_atime);
111075d633cbSKonstantin Belousov 		CP(u32.shmid_ds32, u.shmid_ds, shm_dtime);
111175d633cbSKonstantin Belousov 		CP(u32.shmid_ds32, u.shmid_ds, shm_ctime);
111275d633cbSKonstantin Belousov 	}
111375d633cbSKonstantin Belousov 
111475d633cbSKonstantin Belousov 	error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz);
111575d633cbSKonstantin Belousov 	if (error)
111675d633cbSKonstantin Belousov 		goto done;
111775d633cbSKonstantin Belousov 
111875d633cbSKonstantin Belousov 	/* Cases in which we need to copyout */
111975d633cbSKonstantin Belousov 	switch (uap->cmd) {
112075d633cbSKonstantin Belousov 	case IPC_INFO:
112175d633cbSKonstantin Belousov 		CP(u.shminfo, u32.shminfo32, shmmax);
112275d633cbSKonstantin Belousov 		CP(u.shminfo, u32.shminfo32, shmmin);
112375d633cbSKonstantin Belousov 		CP(u.shminfo, u32.shminfo32, shmmni);
112475d633cbSKonstantin Belousov 		CP(u.shminfo, u32.shminfo32, shmseg);
112575d633cbSKonstantin Belousov 		CP(u.shminfo, u32.shminfo32, shmall);
112675d633cbSKonstantin Belousov 		error = copyout(&u32.shminfo32, uap->buf,
112775d633cbSKonstantin Belousov 		    sizeof(u32.shminfo32));
112875d633cbSKonstantin Belousov 		break;
112975d633cbSKonstantin Belousov 	case SHM_INFO:
113075d633cbSKonstantin Belousov 		CP(u.shm_info, u32.shm_info32, used_ids);
113175d633cbSKonstantin Belousov 		CP(u.shm_info, u32.shm_info32, shm_rss);
113275d633cbSKonstantin Belousov 		CP(u.shm_info, u32.shm_info32, shm_tot);
113375d633cbSKonstantin Belousov 		CP(u.shm_info, u32.shm_info32, shm_swp);
113475d633cbSKonstantin Belousov 		CP(u.shm_info, u32.shm_info32, swap_attempts);
113575d633cbSKonstantin Belousov 		CP(u.shm_info, u32.shm_info32, swap_successes);
113675d633cbSKonstantin Belousov 		error = copyout(&u32.shm_info32, uap->buf,
113775d633cbSKonstantin Belousov 		    sizeof(u32.shm_info32));
113875d633cbSKonstantin Belousov 		break;
113975d633cbSKonstantin Belousov 	case SHM_STAT:
114075d633cbSKonstantin Belousov 	case IPC_STAT:
114175d633cbSKonstantin Belousov 		freebsd32_ipcperm_old_out(&u.shmid_ds.shm_perm,
114275d633cbSKonstantin Belousov 		    &u32.shmid_ds32.shm_perm);
114375d633cbSKonstantin Belousov 		if (u.shmid_ds.shm_segsz > INT32_MAX)
114475d633cbSKonstantin Belousov 			u32.shmid_ds32.shm_segsz = INT32_MAX;
114575d633cbSKonstantin Belousov 		else
114675d633cbSKonstantin Belousov 			CP(u.shmid_ds, u32.shmid_ds32, shm_segsz);
114775d633cbSKonstantin Belousov 		CP(u.shmid_ds, u32.shmid_ds32, shm_lpid);
114875d633cbSKonstantin Belousov 		CP(u.shmid_ds, u32.shmid_ds32, shm_cpid);
114975d633cbSKonstantin Belousov 		CP(u.shmid_ds, u32.shmid_ds32, shm_nattch);
115075d633cbSKonstantin Belousov 		CP(u.shmid_ds, u32.shmid_ds32, shm_atime);
115175d633cbSKonstantin Belousov 		CP(u.shmid_ds, u32.shmid_ds32, shm_dtime);
115275d633cbSKonstantin Belousov 		CP(u.shmid_ds, u32.shmid_ds32, shm_ctime);
115375d633cbSKonstantin Belousov 		u32.shmid_ds32.shm_internal = 0;
115475d633cbSKonstantin Belousov 		error = copyout(&u32.shmid_ds32, uap->buf,
115575d633cbSKonstantin Belousov 		    sizeof(u32.shmid_ds32));
115675d633cbSKonstantin Belousov 		break;
115775d633cbSKonstantin Belousov 	}
115875d633cbSKonstantin Belousov 
115975d633cbSKonstantin Belousov done:
116075d633cbSKonstantin Belousov 	if (error) {
116175d633cbSKonstantin Belousov 		/* Invalidate the return value */
116275d633cbSKonstantin Belousov 		td->td_retval[0] = -1;
116375d633cbSKonstantin Belousov 	}
116475d633cbSKonstantin Belousov 	return (error);
116575d633cbSKonstantin Belousov }
116675d633cbSKonstantin Belousov #endif
116775d633cbSKonstantin Belousov 
116875d633cbSKonstantin Belousov int
116975d633cbSKonstantin Belousov freebsd32_shmctl(struct thread *td, struct freebsd32_shmctl_args *uap)
117075d633cbSKonstantin Belousov {
1171e2f5418eSMateusz Guzik 	int error;
117275d633cbSKonstantin Belousov 	union {
117375d633cbSKonstantin Belousov 		struct shmid_ds shmid_ds;
117475d633cbSKonstantin Belousov 		struct shm_info shm_info;
117575d633cbSKonstantin Belousov 		struct shminfo shminfo;
117675d633cbSKonstantin Belousov 	} u;
117775d633cbSKonstantin Belousov 	union {
117875d633cbSKonstantin Belousov 		struct shmid_ds32 shmid_ds32;
117975d633cbSKonstantin Belousov 		struct shm_info32 shm_info32;
118075d633cbSKonstantin Belousov 		struct shminfo32 shminfo32;
118175d633cbSKonstantin Belousov 	} u32;
118275d633cbSKonstantin Belousov 	size_t sz;
118375d633cbSKonstantin Belousov 
118475d633cbSKonstantin Belousov 	if (uap->cmd == IPC_SET) {
118575d633cbSKonstantin Belousov 		if ((error = copyin(uap->buf, &u32.shmid_ds32,
118675d633cbSKonstantin Belousov 		    sizeof(u32.shmid_ds32))))
118775d633cbSKonstantin Belousov 			goto done;
118875d633cbSKonstantin Belousov 		freebsd32_ipcperm_in(&u32.shmid_ds32.shm_perm,
118975d633cbSKonstantin Belousov 		    &u.shmid_ds.shm_perm);
119075d633cbSKonstantin Belousov 		CP(u32.shmid_ds32, u.shmid_ds, shm_segsz);
119175d633cbSKonstantin Belousov 		CP(u32.shmid_ds32, u.shmid_ds, shm_lpid);
119275d633cbSKonstantin Belousov 		CP(u32.shmid_ds32, u.shmid_ds, shm_cpid);
119375d633cbSKonstantin Belousov 		CP(u32.shmid_ds32, u.shmid_ds, shm_nattch);
119475d633cbSKonstantin Belousov 		CP(u32.shmid_ds32, u.shmid_ds, shm_atime);
119575d633cbSKonstantin Belousov 		CP(u32.shmid_ds32, u.shmid_ds, shm_dtime);
119675d633cbSKonstantin Belousov 		CP(u32.shmid_ds32, u.shmid_ds, shm_ctime);
119775d633cbSKonstantin Belousov 	}
119875d633cbSKonstantin Belousov 
119975d633cbSKonstantin Belousov 	error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz);
120075d633cbSKonstantin Belousov 	if (error)
120175d633cbSKonstantin Belousov 		goto done;
120275d633cbSKonstantin Belousov 
120375d633cbSKonstantin Belousov 	/* Cases in which we need to copyout */
120475d633cbSKonstantin Belousov 	switch (uap->cmd) {
120575d633cbSKonstantin Belousov 	case IPC_INFO:
120675d633cbSKonstantin Belousov 		CP(u.shminfo, u32.shminfo32, shmmax);
120775d633cbSKonstantin Belousov 		CP(u.shminfo, u32.shminfo32, shmmin);
120875d633cbSKonstantin Belousov 		CP(u.shminfo, u32.shminfo32, shmmni);
120975d633cbSKonstantin Belousov 		CP(u.shminfo, u32.shminfo32, shmseg);
121075d633cbSKonstantin Belousov 		CP(u.shminfo, u32.shminfo32, shmall);
121175d633cbSKonstantin Belousov 		error = copyout(&u32.shminfo32, uap->buf,
121275d633cbSKonstantin Belousov 		    sizeof(u32.shminfo32));
121375d633cbSKonstantin Belousov 		break;
121475d633cbSKonstantin Belousov 	case SHM_INFO:
121575d633cbSKonstantin Belousov 		CP(u.shm_info, u32.shm_info32, used_ids);
121675d633cbSKonstantin Belousov 		CP(u.shm_info, u32.shm_info32, shm_rss);
121775d633cbSKonstantin Belousov 		CP(u.shm_info, u32.shm_info32, shm_tot);
121875d633cbSKonstantin Belousov 		CP(u.shm_info, u32.shm_info32, shm_swp);
121975d633cbSKonstantin Belousov 		CP(u.shm_info, u32.shm_info32, swap_attempts);
122075d633cbSKonstantin Belousov 		CP(u.shm_info, u32.shm_info32, swap_successes);
122175d633cbSKonstantin Belousov 		error = copyout(&u32.shm_info32, uap->buf,
122275d633cbSKonstantin Belousov 		    sizeof(u32.shm_info32));
122375d633cbSKonstantin Belousov 		break;
122475d633cbSKonstantin Belousov 	case SHM_STAT:
122575d633cbSKonstantin Belousov 	case IPC_STAT:
122675d633cbSKonstantin Belousov 		freebsd32_ipcperm_out(&u.shmid_ds.shm_perm,
122775d633cbSKonstantin Belousov 		    &u32.shmid_ds32.shm_perm);
122875d633cbSKonstantin Belousov 		if (u.shmid_ds.shm_segsz > INT32_MAX)
122975d633cbSKonstantin Belousov 			u32.shmid_ds32.shm_segsz = INT32_MAX;
123075d633cbSKonstantin Belousov 		else
123175d633cbSKonstantin Belousov 			CP(u.shmid_ds, u32.shmid_ds32, shm_segsz);
123275d633cbSKonstantin Belousov 		CP(u.shmid_ds, u32.shmid_ds32, shm_lpid);
123375d633cbSKonstantin Belousov 		CP(u.shmid_ds, u32.shmid_ds32, shm_cpid);
123475d633cbSKonstantin Belousov 		CP(u.shmid_ds, u32.shmid_ds32, shm_nattch);
123575d633cbSKonstantin Belousov 		CP(u.shmid_ds, u32.shmid_ds32, shm_atime);
123675d633cbSKonstantin Belousov 		CP(u.shmid_ds, u32.shmid_ds32, shm_dtime);
123775d633cbSKonstantin Belousov 		CP(u.shmid_ds, u32.shmid_ds32, shm_ctime);
123875d633cbSKonstantin Belousov 		error = copyout(&u32.shmid_ds32, uap->buf,
123975d633cbSKonstantin Belousov 		    sizeof(u32.shmid_ds32));
124075d633cbSKonstantin Belousov 		break;
124175d633cbSKonstantin Belousov 	}
124275d633cbSKonstantin Belousov 
124375d633cbSKonstantin Belousov done:
124475d633cbSKonstantin Belousov 	if (error) {
124575d633cbSKonstantin Belousov 		/* Invalidate the return value */
124675d633cbSKonstantin Belousov 		td->td_retval[0] = -1;
124775d633cbSKonstantin Belousov 	}
124875d633cbSKonstantin Belousov 	return (error);
124975d633cbSKonstantin Belousov }
125075d633cbSKonstantin Belousov #endif
125175d633cbSKonstantin Belousov 
1252b648d480SJohn Baldwin #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1253b648d480SJohn Baldwin     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1254b648d480SJohn Baldwin 
125575d633cbSKonstantin Belousov #ifndef CP
1256b648d480SJohn Baldwin #define CP(src, dst, fld)	do { (dst).fld = (src).fld; } while (0)
125775d633cbSKonstantin Belousov #endif
1258b648d480SJohn Baldwin 
1259b648d480SJohn Baldwin #ifndef _SYS_SYSPROTO_H_
1260b648d480SJohn Baldwin struct freebsd7_shmctl_args {
1261b648d480SJohn Baldwin 	int shmid;
1262b648d480SJohn Baldwin 	int cmd;
1263b648d480SJohn Baldwin 	struct shmid_ds_old *buf;
1264b648d480SJohn Baldwin };
1265b648d480SJohn Baldwin #endif
1266b648d480SJohn Baldwin int
12670555fb35SKonstantin Belousov freebsd7_shmctl(struct thread *td, struct freebsd7_shmctl_args *uap)
1268b648d480SJohn Baldwin {
1269e2f5418eSMateusz Guzik 	int error;
1270b648d480SJohn Baldwin 	struct shmid_ds_old old;
1271b648d480SJohn Baldwin 	struct shmid_ds buf;
1272b648d480SJohn Baldwin 	size_t bufsz;
1273b648d480SJohn Baldwin 
1274b648d480SJohn Baldwin 	/*
1275b648d480SJohn Baldwin 	 * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support
1276b648d480SJohn Baldwin 	 * Linux binaries.  If we see the call come through the FreeBSD ABI,
1277b648d480SJohn Baldwin 	 * return an error back to the user since we do not to support this.
1278b648d480SJohn Baldwin 	 */
1279b648d480SJohn Baldwin 	if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO ||
1280b648d480SJohn Baldwin 	    uap->cmd == SHM_STAT)
1281b648d480SJohn Baldwin 		return (EINVAL);
1282b648d480SJohn Baldwin 
1283b648d480SJohn Baldwin 	/* IPC_SET needs to copyin the buffer before calling kern_shmctl */
1284b648d480SJohn Baldwin 	if (uap->cmd == IPC_SET) {
1285b648d480SJohn Baldwin 		if ((error = copyin(uap->buf, &old, sizeof(old))))
1286b648d480SJohn Baldwin 			goto done;
1287b648d480SJohn Baldwin 		ipcperm_old2new(&old.shm_perm, &buf.shm_perm);
1288b648d480SJohn Baldwin 		CP(old, buf, shm_segsz);
1289b648d480SJohn Baldwin 		CP(old, buf, shm_lpid);
1290b648d480SJohn Baldwin 		CP(old, buf, shm_cpid);
1291b648d480SJohn Baldwin 		CP(old, buf, shm_nattch);
1292b648d480SJohn Baldwin 		CP(old, buf, shm_atime);
1293b648d480SJohn Baldwin 		CP(old, buf, shm_dtime);
1294b648d480SJohn Baldwin 		CP(old, buf, shm_ctime);
1295b648d480SJohn Baldwin 	}
1296b648d480SJohn Baldwin 
1297b648d480SJohn Baldwin 	error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz);
1298b648d480SJohn Baldwin 	if (error)
1299b648d480SJohn Baldwin 		goto done;
1300b648d480SJohn Baldwin 
1301b648d480SJohn Baldwin 	/* Cases in which we need to copyout */
1302b648d480SJohn Baldwin 	switch (uap->cmd) {
1303b648d480SJohn Baldwin 	case IPC_STAT:
1304b648d480SJohn Baldwin 		ipcperm_new2old(&buf.shm_perm, &old.shm_perm);
1305b648d480SJohn Baldwin 		if (buf.shm_segsz > INT_MAX)
1306b648d480SJohn Baldwin 			old.shm_segsz = INT_MAX;
1307b648d480SJohn Baldwin 		else
1308b648d480SJohn Baldwin 			CP(buf, old, shm_segsz);
1309b648d480SJohn Baldwin 		CP(buf, old, shm_lpid);
1310b648d480SJohn Baldwin 		CP(buf, old, shm_cpid);
1311b648d480SJohn Baldwin 		if (buf.shm_nattch > SHRT_MAX)
1312b648d480SJohn Baldwin 			old.shm_nattch = SHRT_MAX;
1313b648d480SJohn Baldwin 		else
1314b648d480SJohn Baldwin 			CP(buf, old, shm_nattch);
1315b648d480SJohn Baldwin 		CP(buf, old, shm_atime);
1316b648d480SJohn Baldwin 		CP(buf, old, shm_dtime);
1317b648d480SJohn Baldwin 		CP(buf, old, shm_ctime);
1318b648d480SJohn Baldwin 		old.shm_internal = NULL;
1319b648d480SJohn Baldwin 		error = copyout(&old, uap->buf, sizeof(old));
1320b648d480SJohn Baldwin 		break;
1321b648d480SJohn Baldwin 	}
1322b648d480SJohn Baldwin 
1323b648d480SJohn Baldwin done:
1324b648d480SJohn Baldwin 	if (error) {
1325b648d480SJohn Baldwin 		/* Invalidate the return value */
1326b648d480SJohn Baldwin 		td->td_retval[0] = -1;
1327b648d480SJohn Baldwin 	}
1328b648d480SJohn Baldwin 	return (error);
1329b648d480SJohn Baldwin }
1330b648d480SJohn Baldwin 
1331b648d480SJohn Baldwin #endif	/* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 ||
1332b648d480SJohn Baldwin 	   COMPAT_FREEBSD7 */
1333b648d480SJohn Baldwin 
1334a723c4e1SDima Dorfman static int
133578525ce3SAlfred Perlstein sysvshm_modload(struct module *module, int cmd, void *arg)
133678525ce3SAlfred Perlstein {
133778525ce3SAlfred Perlstein 	int error = 0;
133878525ce3SAlfred Perlstein 
133978525ce3SAlfred Perlstein 	switch (cmd) {
134078525ce3SAlfred Perlstein 	case MOD_LOAD:
134175d633cbSKonstantin Belousov 		error = shminit();
134275d633cbSKonstantin Belousov 		if (error != 0)
134375d633cbSKonstantin Belousov 			shmunload();
134478525ce3SAlfred Perlstein 		break;
134578525ce3SAlfred Perlstein 	case MOD_UNLOAD:
134678525ce3SAlfred Perlstein 		error = shmunload();
134778525ce3SAlfred Perlstein 		break;
134878525ce3SAlfred Perlstein 	case MOD_SHUTDOWN:
134978525ce3SAlfred Perlstein 		break;
135078525ce3SAlfred Perlstein 	default:
135178525ce3SAlfred Perlstein 		error = EINVAL;
135278525ce3SAlfred Perlstein 		break;
135378525ce3SAlfred Perlstein 	}
135478525ce3SAlfred Perlstein 	return (error);
135578525ce3SAlfred Perlstein }
135678525ce3SAlfred Perlstein 
1357faa784b7SDag-Erling Smørgrav static moduledata_t sysvshm_mod = {
1358faa784b7SDag-Erling Smørgrav 	"sysvshm",
135978525ce3SAlfred Perlstein 	&sysvshm_modload,
136078525ce3SAlfred Perlstein 	NULL
136178525ce3SAlfred Perlstein };
136278525ce3SAlfred Perlstein 
136371361470SJohn Baldwin DECLARE_MODULE(sysvshm, sysvshm_mod, SI_SUB_SYSV_SHM, SI_ORDER_FIRST);
1364faa784b7SDag-Erling Smørgrav MODULE_VERSION(sysvshm, 1);
1365