xref: /freebsd/sys/kern/sysv_shm.c (revision 4d9d1e823c5735be5fe9f21e22b8bf1efaf717ca)
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>
8068ba7a1dSTim J. Robbins #include <sys/resourcevar.h>
813d903220SDoug Rabson #include <sys/stat.h>
8278525ce3SAlfred Perlstein #include <sys/syscall.h>
83f130dcf2SMartin Blapp #include <sys/syscallsubr.h>
84725db531SBruce Evans #include <sys/sysent.h>
85fb919e4dSMark Murray #include <sys/sysproto.h>
86cb1f0db9SRobert Watson #include <sys/jail.h>
87aed55708SRobert Watson 
88aed55708SRobert Watson #include <security/mac/mac_framework.h>
893d903220SDoug Rabson 
903d903220SDoug Rabson #include <vm/vm.h>
91efeaf95aSDavid Greenman #include <vm/vm_param.h>
92efeaf95aSDavid Greenman #include <vm/pmap.h>
93a51f7119SJohn Dyson #include <vm/vm_object.h>
943d903220SDoug Rabson #include <vm/vm_map.h>
951c7c3c6aSMatthew Dillon #include <vm/vm_page.h>
96ae9b8c3aSJohn Dyson #include <vm/vm_pager.h>
973d903220SDoug Rabson 
98a1c995b6SPoul-Henning Kamp static MALLOC_DEFINE(M_SHM, "shm", "SVID compatible shared memory segments");
9955166637SPoul-Henning Kamp 
1004d77a549SAlfred Perlstein static int shmget_allocate_segment(struct thread *td,
1014d77a549SAlfred Perlstein     struct shmget_args *uap, int mode);
1024d77a549SAlfred Perlstein static int shmget_existing(struct thread *td, struct shmget_args *uap,
1034d77a549SAlfred Perlstein     int mode, int segnum);
104725db531SBruce Evans 
1053d903220SDoug Rabson #define	SHMSEG_FREE     	0x0200
1063d903220SDoug Rabson #define	SHMSEG_REMOVED  	0x0400
1073d903220SDoug Rabson #define	SHMSEG_ALLOCATED	0x0800
1083d903220SDoug Rabson #define	SHMSEG_WANTED		0x1000
1093d903220SDoug Rabson 
11065067cc8SKonstantin Belousov static int shm_last_free, shm_nused, shmalloced;
11145329b60SKonstantin Belousov vm_size_t shm_committed;
112921d05b9SRobert Watson static struct shmid_kernel	*shmsegs;
1133d903220SDoug Rabson 
1143d903220SDoug Rabson struct shmmap_state {
1153d903220SDoug Rabson 	vm_offset_t va;
1163d903220SDoug Rabson 	int shmid;
1173d903220SDoug Rabson };
1183d903220SDoug Rabson 
119921d05b9SRobert Watson static void shm_deallocate_segment(struct shmid_kernel *);
1204d77a549SAlfred Perlstein static int shm_find_segment_by_key(key_t);
121921d05b9SRobert Watson static struct shmid_kernel *shm_find_segment_by_shmid(int);
122921d05b9SRobert Watson static struct shmid_kernel *shm_find_segment_by_shmidx(int);
1233db161e0SMatthew Dillon static int shm_delete_mapping(struct vmspace *vm, struct shmmap_state *);
1244d77a549SAlfred Perlstein static void shmrealloc(void);
1254d77a549SAlfred Perlstein static void shminit(void);
1264d77a549SAlfred Perlstein static int sysvshm_modload(struct module *, int, void *);
1274d77a549SAlfred Perlstein static int shmunload(void);
1283db161e0SMatthew Dillon static void shmexit_myhook(struct vmspace *vm);
1294d77a549SAlfred Perlstein static void shmfork_myhook(struct proc *p1, struct proc *p2);
1304d77a549SAlfred Perlstein static int sysctl_shmsegs(SYSCTL_HANDLER_ARGS);
131255108f3SPeter Wemm 
132255108f3SPeter Wemm /*
133028f979dSDima Dorfman  * Tuneable values.
134255108f3SPeter Wemm  */
135255108f3SPeter Wemm #ifndef SHMMAXPGS
136028f979dSDima Dorfman #define	SHMMAXPGS	8192	/* Note: sysv shared memory is swap backed. */
137255108f3SPeter Wemm #endif
138255108f3SPeter Wemm #ifndef SHMMAX
139255108f3SPeter Wemm #define	SHMMAX	(SHMMAXPGS*PAGE_SIZE)
140255108f3SPeter Wemm #endif
141255108f3SPeter Wemm #ifndef SHMMIN
142255108f3SPeter Wemm #define	SHMMIN	1
143255108f3SPeter Wemm #endif
144255108f3SPeter Wemm #ifndef SHMMNI
1451766b2e5SMatthew Dillon #define	SHMMNI	192
146255108f3SPeter Wemm #endif
147255108f3SPeter Wemm #ifndef SHMSEG
1481766b2e5SMatthew Dillon #define	SHMSEG	128
149255108f3SPeter Wemm #endif
150255108f3SPeter Wemm #ifndef SHMALL
151255108f3SPeter Wemm #define	SHMALL	(SHMMAXPGS)
152255108f3SPeter Wemm #endif
153255108f3SPeter Wemm 
154255108f3SPeter Wemm struct	shminfo shminfo = {
155255108f3SPeter Wemm 	SHMMAX,
156255108f3SPeter Wemm 	SHMMIN,
157255108f3SPeter Wemm 	SHMMNI,
158255108f3SPeter Wemm 	SHMSEG,
159255108f3SPeter Wemm 	SHMALL
160255108f3SPeter Wemm };
161255108f3SPeter Wemm 
1628b03c8edSMatthew Dillon static int shm_use_phys;
1632332251cSMax Khon static int shm_allow_removed;
1648b03c8edSMatthew Dillon 
1659baea4b4SChristian S.J. Peron SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmax, CTLFLAG_RW, &shminfo.shmmax, 0,
16684f85aedSChristian S.J. Peron     "Maximum shared memory segment size");
1679baea4b4SChristian S.J. Peron SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmin, CTLFLAG_RW, &shminfo.shmmin, 0,
16884f85aedSChristian S.J. Peron     "Minimum shared memory segment size");
1699baea4b4SChristian S.J. Peron SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmni, CTLFLAG_RDTUN, &shminfo.shmmni, 0,
17084f85aedSChristian S.J. Peron     "Number of shared memory identifiers");
1719baea4b4SChristian S.J. Peron SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmseg, CTLFLAG_RDTUN, &shminfo.shmseg, 0,
17284f85aedSChristian S.J. Peron     "Number of segments per process");
1739baea4b4SChristian S.J. Peron SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmall, CTLFLAG_RW, &shminfo.shmall, 0,
17484f85aedSChristian S.J. Peron     "Maximum number of pages available for shared memory");
175028f979dSDima Dorfman SYSCTL_INT(_kern_ipc, OID_AUTO, shm_use_phys, CTLFLAG_RW,
17684f85aedSChristian S.J. Peron     &shm_use_phys, 0, "Enable/Disable locking of shared memory pages in core");
1772332251cSMax Khon SYSCTL_INT(_kern_ipc, OID_AUTO, shm_allow_removed, CTLFLAG_RW,
17884f85aedSChristian S.J. Peron     &shm_allow_removed, 0,
17984f85aedSChristian S.J. Peron     "Enable/Disable attachment to attached segments marked for removal");
180a723c4e1SDima Dorfman SYSCTL_PROC(_kern_ipc, OID_AUTO, shmsegs, CTLFLAG_RD,
18184f85aedSChristian S.J. Peron     NULL, 0, sysctl_shmsegs, "",
18284f85aedSChristian S.J. Peron     "Current number of shared memory segments allocated");
1833d903220SDoug Rabson 
1843d903220SDoug Rabson static int
1853d903220SDoug Rabson shm_find_segment_by_key(key)
1863d903220SDoug Rabson 	key_t key;
1873d903220SDoug Rabson {
1883d903220SDoug Rabson 	int i;
1893d903220SDoug Rabson 
190255108f3SPeter Wemm 	for (i = 0; i < shmalloced; i++)
191921d05b9SRobert Watson 		if ((shmsegs[i].u.shm_perm.mode & SHMSEG_ALLOCATED) &&
192921d05b9SRobert Watson 		    shmsegs[i].u.shm_perm.key == key)
193b618bb96SAlfred Perlstein 			return (i);
194b618bb96SAlfred Perlstein 	return (-1);
1953d903220SDoug Rabson }
1963d903220SDoug Rabson 
197921d05b9SRobert Watson static struct shmid_kernel *
1982332251cSMax Khon shm_find_segment_by_shmid(int shmid)
1993d903220SDoug Rabson {
2003d903220SDoug Rabson 	int segnum;
201921d05b9SRobert Watson 	struct shmid_kernel *shmseg;
2023d903220SDoug Rabson 
2033d903220SDoug Rabson 	segnum = IPCID_TO_IX(shmid);
204255108f3SPeter Wemm 	if (segnum < 0 || segnum >= shmalloced)
205b618bb96SAlfred Perlstein 		return (NULL);
2063d903220SDoug Rabson 	shmseg = &shmsegs[segnum];
207921d05b9SRobert Watson 	if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 ||
2082332251cSMax Khon 	    (!shm_allow_removed &&
209921d05b9SRobert Watson 	     (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) != 0) ||
210921d05b9SRobert Watson 	    shmseg->u.shm_perm.seq != IPCID_TO_SEQ(shmid))
211b618bb96SAlfred Perlstein 		return (NULL);
212b618bb96SAlfred Perlstein 	return (shmseg);
2133d903220SDoug Rabson }
2143d903220SDoug Rabson 
215921d05b9SRobert Watson static struct shmid_kernel *
2162332251cSMax Khon shm_find_segment_by_shmidx(int segnum)
217491dec93SMichael Reifenberger {
218921d05b9SRobert Watson 	struct shmid_kernel *shmseg;
219491dec93SMichael Reifenberger 
220491dec93SMichael Reifenberger 	if (segnum < 0 || segnum >= shmalloced)
221b618bb96SAlfred Perlstein 		return (NULL);
222491dec93SMichael Reifenberger 	shmseg = &shmsegs[segnum];
223921d05b9SRobert Watson 	if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 ||
2242332251cSMax Khon 	    (!shm_allow_removed &&
225921d05b9SRobert Watson 	     (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) != 0))
226b618bb96SAlfred Perlstein 		return (NULL);
227b618bb96SAlfred Perlstein 	return (shmseg);
228491dec93SMichael Reifenberger }
229491dec93SMichael Reifenberger 
2303d903220SDoug Rabson static void
2313d903220SDoug Rabson shm_deallocate_segment(shmseg)
232921d05b9SRobert Watson 	struct shmid_kernel *shmseg;
2333d903220SDoug Rabson {
23445329b60SKonstantin Belousov 	vm_size_t size;
2353d903220SDoug Rabson 
2360cddd8f0SMatthew Dillon 	GIANT_REQUIRED;
2370cddd8f0SMatthew Dillon 
238b648d480SJohn Baldwin 	vm_object_deallocate(shmseg->object);
239b648d480SJohn Baldwin 	shmseg->object = NULL;
240b648d480SJohn Baldwin 	size = round_page(shmseg->u.shm_segsz);
2413d903220SDoug Rabson 	shm_committed -= btoc(size);
2423d903220SDoug Rabson 	shm_nused--;
243921d05b9SRobert Watson 	shmseg->u.shm_perm.mode = SHMSEG_FREE;
24414cedfc8SRobert Watson #ifdef MAC
24530d239bcSRobert Watson 	mac_sysvshm_cleanup(shmseg);
24614cedfc8SRobert Watson #endif
2473d903220SDoug Rabson }
2483d903220SDoug Rabson 
2493d903220SDoug Rabson static int
2503db161e0SMatthew Dillon shm_delete_mapping(struct vmspace *vm, struct shmmap_state *shmmap_s)
2513d903220SDoug Rabson {
252921d05b9SRobert Watson 	struct shmid_kernel *shmseg;
2533d903220SDoug Rabson 	int segnum, result;
25445329b60SKonstantin Belousov 	vm_size_t size;
2553d903220SDoug Rabson 
2560cddd8f0SMatthew Dillon 	GIANT_REQUIRED;
257028f979dSDima Dorfman 
2583d903220SDoug Rabson 	segnum = IPCID_TO_IX(shmmap_s->shmid);
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 
274b5d5c0c9SPeter Wemm #ifndef _SYS_SYSPROTO_H_
2753d903220SDoug Rabson struct shmdt_args {
276e1d7d0bbSAlfred Perlstein 	const void *shmaddr;
2773d903220SDoug Rabson };
278b5d5c0c9SPeter Wemm #endif
2793d903220SDoug Rabson int
280b40ce416SJulian Elischer shmdt(td, uap)
281b40ce416SJulian Elischer 	struct thread *td;
2823d903220SDoug Rabson 	struct shmdt_args *uap;
2833d903220SDoug Rabson {
284b40ce416SJulian Elischer 	struct proc *p = td->td_proc;
2853d903220SDoug Rabson 	struct shmmap_state *shmmap_s;
28614cedfc8SRobert Watson #ifdef MAC
28714cedfc8SRobert Watson 	struct shmid_kernel *shmsegptr;
28814cedfc8SRobert Watson #endif
2893d903220SDoug Rabson 	int i;
290b6a4b4f9SMatthew Dillon 	int error = 0;
2913d903220SDoug Rabson 
2920304c731SJamie Gritton 	if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
293c6f55f33SJohn Baldwin 		return (ENOSYS);
294b6a4b4f9SMatthew Dillon 	mtx_lock(&Giant);
2958209f090SAlfred Perlstein 	shmmap_s = p->p_vmspace->vm_shm;
296b6a4b4f9SMatthew Dillon  	if (shmmap_s == NULL) {
297b6a4b4f9SMatthew Dillon 		error = EINVAL;
298b6a4b4f9SMatthew Dillon 		goto done2;
299b6a4b4f9SMatthew Dillon 	}
300b6a4b4f9SMatthew Dillon 	for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) {
3013d903220SDoug Rabson 		if (shmmap_s->shmid != -1 &&
302b6a4b4f9SMatthew Dillon 		    shmmap_s->va == (vm_offset_t)uap->shmaddr) {
3033d903220SDoug Rabson 			break;
304b6a4b4f9SMatthew Dillon 		}
305b6a4b4f9SMatthew Dillon 	}
306b6a4b4f9SMatthew Dillon 	if (i == shminfo.shmseg) {
307b6a4b4f9SMatthew Dillon 		error = EINVAL;
308b6a4b4f9SMatthew Dillon 		goto done2;
309b6a4b4f9SMatthew Dillon 	}
31014cedfc8SRobert Watson #ifdef MAC
31114cedfc8SRobert Watson 	shmsegptr = &shmsegs[IPCID_TO_IX(shmmap_s->shmid)];
31230d239bcSRobert Watson 	error = mac_sysvshm_check_shmdt(td->td_ucred, shmsegptr);
313f50c4fd8SRobert Watson 	if (error != 0)
31414cedfc8SRobert Watson 		goto done2;
31514cedfc8SRobert Watson #endif
3163db161e0SMatthew Dillon 	error = shm_delete_mapping(p->p_vmspace, shmmap_s);
317b6a4b4f9SMatthew Dillon done2:
318b6a4b4f9SMatthew Dillon 	mtx_unlock(&Giant);
319b6a4b4f9SMatthew Dillon 	return (error);
3203d903220SDoug Rabson }
3213d903220SDoug Rabson 
322b5d5c0c9SPeter Wemm #ifndef _SYS_SYSPROTO_H_
3233d903220SDoug Rabson struct shmat_args {
3243d903220SDoug Rabson 	int shmid;
325e1d7d0bbSAlfred Perlstein 	const void *shmaddr;
3263d903220SDoug Rabson 	int shmflg;
3273d903220SDoug Rabson };
328b5d5c0c9SPeter Wemm #endif
3293d903220SDoug Rabson int
3302332251cSMax Khon kern_shmat(td, shmid, shmaddr, shmflg)
331b40ce416SJulian Elischer 	struct thread *td;
332f130dcf2SMartin Blapp 	int shmid;
333f130dcf2SMartin Blapp 	const void *shmaddr;
334f130dcf2SMartin Blapp 	int shmflg;
3353d903220SDoug Rabson {
336b40ce416SJulian Elischer 	struct proc *p = td->td_proc;
337b6a4b4f9SMatthew Dillon 	int i, flags;
338921d05b9SRobert Watson 	struct shmid_kernel *shmseg;
3393d903220SDoug Rabson 	struct shmmap_state *shmmap_s = NULL;
3403d903220SDoug Rabson 	vm_offset_t attach_va;
3413d903220SDoug Rabson 	vm_prot_t prot;
3423d903220SDoug Rabson 	vm_size_t size;
343a51f7119SJohn Dyson 	int rv;
344b6a4b4f9SMatthew Dillon 	int error = 0;
3453d903220SDoug Rabson 
3460304c731SJamie Gritton 	if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
347c6f55f33SJohn Baldwin 		return (ENOSYS);
348b6a4b4f9SMatthew Dillon 	mtx_lock(&Giant);
3498209f090SAlfred Perlstein 	shmmap_s = p->p_vmspace->vm_shm;
3503d903220SDoug Rabson 	if (shmmap_s == NULL) {
35145329b60SKonstantin Belousov 		shmmap_s = malloc(shminfo.shmseg * sizeof(struct shmmap_state),
35245329b60SKonstantin Belousov 		    M_SHM, M_WAITOK);
3533d903220SDoug Rabson 		for (i = 0; i < shminfo.shmseg; i++)
3543d903220SDoug Rabson 			shmmap_s[i].shmid = -1;
3552cc593fdSAlfred Perlstein 		p->p_vmspace->vm_shm = shmmap_s;
3563d903220SDoug Rabson 	}
3572332251cSMax Khon 	shmseg = shm_find_segment_by_shmid(shmid);
358b6a4b4f9SMatthew Dillon 	if (shmseg == NULL) {
359b6a4b4f9SMatthew Dillon 		error = EINVAL;
360b6a4b4f9SMatthew Dillon 		goto done2;
361b6a4b4f9SMatthew Dillon 	}
362921d05b9SRobert Watson 	error = ipcperm(td, &shmseg->u.shm_perm,
363f130dcf2SMartin Blapp 	    (shmflg & SHM_RDONLY) ? IPC_R : IPC_R|IPC_W);
364797f2d22SPoul-Henning Kamp 	if (error)
365b6a4b4f9SMatthew Dillon 		goto done2;
36614cedfc8SRobert Watson #ifdef MAC
36730d239bcSRobert Watson 	error = mac_sysvshm_check_shmat(td->td_ucred, shmseg, shmflg);
368f50c4fd8SRobert Watson 	if (error != 0)
36914cedfc8SRobert Watson 		goto done2;
37014cedfc8SRobert Watson #endif
3713d903220SDoug Rabson 	for (i = 0; i < shminfo.shmseg; i++) {
3723d903220SDoug Rabson 		if (shmmap_s->shmid == -1)
3733d903220SDoug Rabson 			break;
3743d903220SDoug Rabson 		shmmap_s++;
3753d903220SDoug Rabson 	}
376b6a4b4f9SMatthew Dillon 	if (i >= shminfo.shmseg) {
377b6a4b4f9SMatthew Dillon 		error = EMFILE;
378b6a4b4f9SMatthew Dillon 		goto done2;
379b6a4b4f9SMatthew Dillon 	}
380b648d480SJohn Baldwin 	size = round_page(shmseg->u.shm_segsz);
3813d903220SDoug Rabson 	prot = VM_PROT_READ;
382f130dcf2SMartin Blapp 	if ((shmflg & SHM_RDONLY) == 0)
3833d903220SDoug Rabson 		prot |= VM_PROT_WRITE;
3843d903220SDoug Rabson 	flags = MAP_ANON | MAP_SHARED;
385f130dcf2SMartin Blapp 	if (shmaddr) {
3863d903220SDoug Rabson 		flags |= MAP_FIXED;
387f130dcf2SMartin Blapp 		if (shmflg & SHM_RND) {
388f130dcf2SMartin Blapp 			attach_va = (vm_offset_t)shmaddr & ~(SHMLBA-1);
389f130dcf2SMartin Blapp 		} else if (((vm_offset_t)shmaddr & (SHMLBA-1)) == 0) {
390f130dcf2SMartin Blapp 			attach_va = (vm_offset_t)shmaddr;
391b6a4b4f9SMatthew Dillon 		} else {
392b6a4b4f9SMatthew Dillon 			error = EINVAL;
393b6a4b4f9SMatthew Dillon 			goto done2;
394b6a4b4f9SMatthew Dillon 		}
3953d903220SDoug Rabson 	} else {
396028f979dSDima Dorfman 		/*
397028f979dSDima Dorfman 		 * This is just a hint to vm_map_find() about where to
398028f979dSDima Dorfman 		 * put it.
399028f979dSDima Dorfman 		 */
40068ba7a1dSTim J. Robbins 		PROC_LOCK(p);
40168ba7a1dSTim J. Robbins 		attach_va = round_page((vm_offset_t)p->p_vmspace->vm_daddr +
40268ba7a1dSTim J. Robbins 		    lim_max(p, RLIMIT_DATA));
40368ba7a1dSTim J. Robbins 		PROC_UNLOCK(p);
4043d903220SDoug Rabson 	}
405a51f7119SJohn Dyson 
406b648d480SJohn Baldwin 	vm_object_reference(shmseg->object);
407b648d480SJohn Baldwin 	rv = vm_map_find(&p->p_vmspace->vm_map, shmseg->object,
40865067cc8SKonstantin Belousov 	    0, &attach_va, size, (flags & MAP_FIXED) ? VMFS_NO_SPACE :
40965067cc8SKonstantin Belousov 	    VMFS_ANY_SPACE, prot, prot, 0);
410a51f7119SJohn Dyson 	if (rv != KERN_SUCCESS) {
411b648d480SJohn Baldwin 		vm_object_deallocate(shmseg->object);
412b6a4b4f9SMatthew Dillon 		error = ENOMEM;
413b6a4b4f9SMatthew Dillon 		goto done2;
414a51f7119SJohn Dyson 	}
4150463028cSJohn Dyson 	vm_map_inherit(&p->p_vmspace->vm_map,
4160463028cSJohn Dyson 		attach_va, attach_va + size, VM_INHERIT_SHARE);
4170463028cSJohn Dyson 
4183d903220SDoug Rabson 	shmmap_s->va = attach_va;
419f130dcf2SMartin Blapp 	shmmap_s->shmid = shmid;
420921d05b9SRobert Watson 	shmseg->u.shm_lpid = p->p_pid;
421921d05b9SRobert Watson 	shmseg->u.shm_atime = time_second;
422921d05b9SRobert Watson 	shmseg->u.shm_nattch++;
423b40ce416SJulian Elischer 	td->td_retval[0] = attach_va;
424b6a4b4f9SMatthew Dillon done2:
425b6a4b4f9SMatthew Dillon 	mtx_unlock(&Giant);
426b6a4b4f9SMatthew Dillon 	return (error);
4273d903220SDoug Rabson }
4283d903220SDoug Rabson 
429f130dcf2SMartin Blapp int
430f130dcf2SMartin Blapp shmat(td, uap)
431f130dcf2SMartin Blapp 	struct thread *td;
432f130dcf2SMartin Blapp 	struct shmat_args *uap;
433f130dcf2SMartin Blapp {
4342332251cSMax Khon 	return kern_shmat(td, uap->shmid, uap->shmaddr, uap->shmflg);
435f130dcf2SMartin Blapp }
436f130dcf2SMartin Blapp 
4373d903220SDoug Rabson int
4382332251cSMax Khon kern_shmctl(td, shmid, cmd, buf, bufsz)
439b40ce416SJulian Elischer 	struct thread *td;
440f130dcf2SMartin Blapp 	int shmid;
441f130dcf2SMartin Blapp 	int cmd;
442f130dcf2SMartin Blapp 	void *buf;
443f130dcf2SMartin Blapp 	size_t *bufsz;
4443d903220SDoug Rabson {
445b6a4b4f9SMatthew Dillon 	int error = 0;
446921d05b9SRobert Watson 	struct shmid_kernel *shmseg;
4473d903220SDoug Rabson 
4480304c731SJamie Gritton 	if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
449c6f55f33SJohn Baldwin 		return (ENOSYS);
450f130dcf2SMartin Blapp 
451b6a4b4f9SMatthew Dillon 	mtx_lock(&Giant);
452f130dcf2SMartin Blapp 	switch (cmd) {
4534f18813fSChristian S.J. Peron 	/*
4544f18813fSChristian S.J. Peron 	 * It is possible that kern_shmctl is being called from the Linux ABI
4554f18813fSChristian S.J. Peron 	 * layer, in which case, we will need to implement IPC_INFO.  It should
4564f18813fSChristian S.J. Peron 	 * be noted that other shmctl calls will be funneled through here for
4574f18813fSChristian S.J. Peron 	 * Linix binaries as well.
4584f18813fSChristian S.J. Peron 	 *
4594f18813fSChristian S.J. Peron 	 * NB: The Linux ABI layer will convert this data to structure(s) more
4604f18813fSChristian S.J. Peron 	 * consistent with the Linux ABI.
4614f18813fSChristian S.J. Peron 	 */
462491dec93SMichael Reifenberger 	case IPC_INFO:
463f130dcf2SMartin Blapp 		memcpy(buf, &shminfo, sizeof(shminfo));
464f130dcf2SMartin Blapp 		if (bufsz)
465f130dcf2SMartin Blapp 			*bufsz = sizeof(shminfo);
466491dec93SMichael Reifenberger 		td->td_retval[0] = shmalloced;
467491dec93SMichael Reifenberger 		goto done2;
468491dec93SMichael Reifenberger 	case SHM_INFO: {
469491dec93SMichael Reifenberger 		struct shm_info shm_info;
470491dec93SMichael Reifenberger 		shm_info.used_ids = shm_nused;
471491dec93SMichael Reifenberger 		shm_info.shm_rss = 0;	/*XXX where to get from ? */
472491dec93SMichael Reifenberger 		shm_info.shm_tot = 0;	/*XXX where to get from ? */
473491dec93SMichael Reifenberger 		shm_info.shm_swp = 0;	/*XXX where to get from ? */
474491dec93SMichael Reifenberger 		shm_info.swap_attempts = 0;	/*XXX where to get from ? */
475491dec93SMichael Reifenberger 		shm_info.swap_successes = 0;	/*XXX where to get from ? */
476f130dcf2SMartin Blapp 		memcpy(buf, &shm_info, sizeof(shm_info));
477f130dcf2SMartin Blapp 		if (bufsz)
478f130dcf2SMartin Blapp 			*bufsz = sizeof(shm_info);
479491dec93SMichael Reifenberger 		td->td_retval[0] = shmalloced;
480491dec93SMichael Reifenberger 		goto done2;
481491dec93SMichael Reifenberger 	}
482491dec93SMichael Reifenberger 	}
483f130dcf2SMartin Blapp 	if (cmd == SHM_STAT)
4842332251cSMax Khon 		shmseg = shm_find_segment_by_shmidx(shmid);
485491dec93SMichael Reifenberger 	else
4862332251cSMax Khon 		shmseg = shm_find_segment_by_shmid(shmid);
487b6a4b4f9SMatthew Dillon 	if (shmseg == NULL) {
488b6a4b4f9SMatthew Dillon 		error = EINVAL;
489b6a4b4f9SMatthew Dillon 		goto done2;
490b6a4b4f9SMatthew Dillon 	}
49114cedfc8SRobert Watson #ifdef MAC
49230d239bcSRobert Watson 	error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, cmd);
493f50c4fd8SRobert Watson 	if (error != 0)
49414cedfc8SRobert Watson 		goto done2;
49514cedfc8SRobert Watson #endif
496f130dcf2SMartin Blapp 	switch (cmd) {
497491dec93SMichael Reifenberger 	case SHM_STAT:
4983d903220SDoug Rabson 	case IPC_STAT:
499921d05b9SRobert Watson 		error = ipcperm(td, &shmseg->u.shm_perm, IPC_R);
500797f2d22SPoul-Henning Kamp 		if (error)
501b6a4b4f9SMatthew Dillon 			goto done2;
502921d05b9SRobert Watson 		memcpy(buf, &shmseg->u, sizeof(struct shmid_ds));
503f130dcf2SMartin Blapp 		if (bufsz)
504f130dcf2SMartin Blapp 			*bufsz = sizeof(struct shmid_ds);
505f130dcf2SMartin Blapp 		if (cmd == SHM_STAT)
506921d05b9SRobert Watson 			td->td_retval[0] = IXSEQ_TO_IPCID(shmid, shmseg->u.shm_perm);
5073d903220SDoug Rabson 		break;
508f130dcf2SMartin Blapp 	case IPC_SET: {
509f130dcf2SMartin Blapp 		struct shmid_ds *shmid;
510f130dcf2SMartin Blapp 
511f130dcf2SMartin Blapp 		shmid = (struct shmid_ds *)buf;
512921d05b9SRobert Watson 		error = ipcperm(td, &shmseg->u.shm_perm, IPC_M);
513797f2d22SPoul-Henning Kamp 		if (error)
514b6a4b4f9SMatthew Dillon 			goto done2;
515921d05b9SRobert Watson 		shmseg->u.shm_perm.uid = shmid->shm_perm.uid;
516921d05b9SRobert Watson 		shmseg->u.shm_perm.gid = shmid->shm_perm.gid;
517921d05b9SRobert Watson 		shmseg->u.shm_perm.mode =
518921d05b9SRobert Watson 		    (shmseg->u.shm_perm.mode & ~ACCESSPERMS) |
519f130dcf2SMartin Blapp 		    (shmid->shm_perm.mode & ACCESSPERMS);
520921d05b9SRobert Watson 		shmseg->u.shm_ctime = time_second;
5213d903220SDoug Rabson 		break;
522f130dcf2SMartin Blapp 	}
5233d903220SDoug Rabson 	case IPC_RMID:
524921d05b9SRobert Watson 		error = ipcperm(td, &shmseg->u.shm_perm, IPC_M);
525797f2d22SPoul-Henning Kamp 		if (error)
526b6a4b4f9SMatthew Dillon 			goto done2;
527921d05b9SRobert Watson 		shmseg->u.shm_perm.key = IPC_PRIVATE;
528921d05b9SRobert Watson 		shmseg->u.shm_perm.mode |= SHMSEG_REMOVED;
529921d05b9SRobert Watson 		if (shmseg->u.shm_nattch <= 0) {
5303d903220SDoug Rabson 			shm_deallocate_segment(shmseg);
531f130dcf2SMartin Blapp 			shm_last_free = IPCID_TO_IX(shmid);
5323d903220SDoug Rabson 		}
5333d903220SDoug Rabson 		break;
5343d903220SDoug Rabson #if 0
5353d903220SDoug Rabson 	case SHM_LOCK:
5363d903220SDoug Rabson 	case SHM_UNLOCK:
5373d903220SDoug Rabson #endif
5383d903220SDoug Rabson 	default:
539b6a4b4f9SMatthew Dillon 		error = EINVAL;
540b6a4b4f9SMatthew Dillon 		break;
5413d903220SDoug Rabson 	}
542b6a4b4f9SMatthew Dillon done2:
543b6a4b4f9SMatthew Dillon 	mtx_unlock(&Giant);
544b6a4b4f9SMatthew Dillon 	return (error);
5453d903220SDoug Rabson }
5463d903220SDoug Rabson 
54771361470SJohn Baldwin #ifndef _SYS_SYSPROTO_H_
54871361470SJohn Baldwin struct shmctl_args {
54971361470SJohn Baldwin 	int shmid;
55071361470SJohn Baldwin 	int cmd;
55171361470SJohn Baldwin 	struct shmid_ds *buf;
55271361470SJohn Baldwin };
55371361470SJohn Baldwin #endif
554f130dcf2SMartin Blapp int
555f130dcf2SMartin Blapp shmctl(td, uap)
556f130dcf2SMartin Blapp 	struct thread *td;
557f130dcf2SMartin Blapp 	struct shmctl_args *uap;
558f130dcf2SMartin Blapp {
559f130dcf2SMartin Blapp 	int error = 0;
560f130dcf2SMartin Blapp 	struct shmid_ds buf;
561f130dcf2SMartin Blapp 	size_t bufsz;
562f130dcf2SMartin Blapp 
5634f18813fSChristian S.J. Peron 	/*
5644f18813fSChristian S.J. Peron 	 * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support
5654f18813fSChristian S.J. Peron 	 * Linux binaries.  If we see the call come through the FreeBSD ABI,
5664f18813fSChristian S.J. Peron 	 * return an error back to the user since we do not to support this.
5674f18813fSChristian S.J. Peron 	 */
5684f18813fSChristian S.J. Peron 	if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO ||
5694f18813fSChristian S.J. Peron 	    uap->cmd == SHM_STAT)
5704f18813fSChristian S.J. Peron 		return (EINVAL);
5714f18813fSChristian S.J. Peron 
572f130dcf2SMartin Blapp 	/* IPC_SET needs to copyin the buffer before calling kern_shmctl */
573f130dcf2SMartin Blapp 	if (uap->cmd == IPC_SET) {
574f130dcf2SMartin Blapp 		if ((error = copyin(uap->buf, &buf, sizeof(struct shmid_ds))))
575f130dcf2SMartin Blapp 			goto done;
576f130dcf2SMartin Blapp 	}
577f130dcf2SMartin Blapp 
5782332251cSMax Khon 	error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz);
579f130dcf2SMartin Blapp 	if (error)
580f130dcf2SMartin Blapp 		goto done;
581f130dcf2SMartin Blapp 
582f130dcf2SMartin Blapp 	/* Cases in which we need to copyout */
583f130dcf2SMartin Blapp 	switch (uap->cmd) {
584f130dcf2SMartin Blapp 	case IPC_STAT:
585f130dcf2SMartin Blapp 		error = copyout(&buf, uap->buf, bufsz);
586f130dcf2SMartin Blapp 		break;
587f130dcf2SMartin Blapp 	}
588f130dcf2SMartin Blapp 
589f130dcf2SMartin Blapp done:
590f130dcf2SMartin Blapp 	if (error) {
591f130dcf2SMartin Blapp 		/* Invalidate the return value */
592f130dcf2SMartin Blapp 		td->td_retval[0] = -1;
593f130dcf2SMartin Blapp 	}
594f130dcf2SMartin Blapp 	return (error);
595f130dcf2SMartin Blapp }
596f130dcf2SMartin Blapp 
597f130dcf2SMartin Blapp 
5983d903220SDoug Rabson static int
599b40ce416SJulian Elischer shmget_existing(td, uap, mode, segnum)
600b40ce416SJulian Elischer 	struct thread *td;
6013d903220SDoug Rabson 	struct shmget_args *uap;
6023d903220SDoug Rabson 	int mode;
6033d903220SDoug Rabson 	int segnum;
6043d903220SDoug Rabson {
605921d05b9SRobert Watson 	struct shmid_kernel *shmseg;
6063d903220SDoug Rabson 	int error;
6073d903220SDoug Rabson 
6083d903220SDoug Rabson 	shmseg = &shmsegs[segnum];
609921d05b9SRobert Watson 	if (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) {
6103d903220SDoug Rabson 		/*
6113d903220SDoug Rabson 		 * This segment is in the process of being allocated.  Wait
6123d903220SDoug Rabson 		 * until it's done, and look the key up again (in case the
6133d903220SDoug Rabson 		 * allocation failed or it was freed).
6143d903220SDoug Rabson 		 */
615921d05b9SRobert Watson 		shmseg->u.shm_perm.mode |= SHMSEG_WANTED;
6162cc593fdSAlfred Perlstein 		error = tsleep(shmseg, PLOCK | PCATCH, "shmget", 0);
617797f2d22SPoul-Henning Kamp 		if (error)
618b618bb96SAlfred Perlstein 			return (error);
619b618bb96SAlfred Perlstein 		return (EAGAIN);
6203d903220SDoug Rabson 	}
621dc92aa57SAlan Cox 	if ((uap->shmflg & (IPC_CREAT | IPC_EXCL)) == (IPC_CREAT | IPC_EXCL))
622b618bb96SAlfred Perlstein 		return (EEXIST);
62314cedfc8SRobert Watson #ifdef MAC
62430d239bcSRobert Watson 	error = mac_sysvshm_check_shmget(td->td_ucred, shmseg, uap->shmflg);
625f50c4fd8SRobert Watson 	if (error != 0)
6267723d5edSRobert Watson 		return (error);
62714cedfc8SRobert Watson #endif
628b648d480SJohn Baldwin 	if (uap->size != 0 && uap->size > shmseg->u.shm_segsz)
629b618bb96SAlfred Perlstein 		return (EINVAL);
630921d05b9SRobert Watson 	td->td_retval[0] = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm);
631b618bb96SAlfred Perlstein 	return (0);
6323d903220SDoug Rabson }
6333d903220SDoug Rabson 
6343d903220SDoug Rabson static int
635b40ce416SJulian Elischer shmget_allocate_segment(td, uap, mode)
636b40ce416SJulian Elischer 	struct thread *td;
6373d903220SDoug Rabson 	struct shmget_args *uap;
6383d903220SDoug Rabson 	int mode;
6393d903220SDoug Rabson {
64065067cc8SKonstantin Belousov 	int i, segnum, shmid;
64165067cc8SKonstantin Belousov 	size_t size;
642a854ed98SJohn Baldwin 	struct ucred *cred = td->td_ucred;
643921d05b9SRobert Watson 	struct shmid_kernel *shmseg;
6440049f8b2SAlan Cox 	vm_object_t shm_object;
6453d903220SDoug Rabson 
6460cddd8f0SMatthew Dillon 	GIANT_REQUIRED;
6470cddd8f0SMatthew Dillon 
6483d903220SDoug Rabson 	if (uap->size < shminfo.shmmin || uap->size > shminfo.shmmax)
649b618bb96SAlfred Perlstein 		return (EINVAL);
650028f979dSDima Dorfman 	if (shm_nused >= shminfo.shmmni) /* Any shmids left? */
651b618bb96SAlfred Perlstein 		return (ENOSPC);
6529e609ddeSJoerg Wunsch 	size = round_page(uap->size);
6533d903220SDoug Rabson 	if (shm_committed + btoc(size) > shminfo.shmall)
654b618bb96SAlfred Perlstein 		return (ENOMEM);
6553d903220SDoug Rabson 	if (shm_last_free < 0) {
656028f979dSDima Dorfman 		shmrealloc();	/* Maybe expand the shmsegs[] array. */
657255108f3SPeter Wemm 		for (i = 0; i < shmalloced; i++)
658921d05b9SRobert Watson 			if (shmsegs[i].u.shm_perm.mode & SHMSEG_FREE)
6593d903220SDoug Rabson 				break;
660255108f3SPeter Wemm 		if (i == shmalloced)
661b618bb96SAlfred Perlstein 			return (ENOSPC);
6623d903220SDoug Rabson 		segnum = i;
6633d903220SDoug Rabson 	} else  {
6643d903220SDoug Rabson 		segnum = shm_last_free;
6653d903220SDoug Rabson 		shm_last_free = -1;
6663d903220SDoug Rabson 	}
6673d903220SDoug Rabson 	shmseg = &shmsegs[segnum];
6683d903220SDoug Rabson 	/*
6693d903220SDoug Rabson 	 * In case we sleep in malloc(), mark the segment present but deleted
6703d903220SDoug Rabson 	 * so that noone else tries to create the same key.
6713d903220SDoug Rabson 	 */
672921d05b9SRobert Watson 	shmseg->u.shm_perm.mode = SHMSEG_ALLOCATED | SHMSEG_REMOVED;
673921d05b9SRobert Watson 	shmseg->u.shm_perm.key = uap->key;
674921d05b9SRobert Watson 	shmseg->u.shm_perm.seq = (shmseg->u.shm_perm.seq + 1) & 0x7fff;
675921d05b9SRobert Watson 	shmid = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm);
676a51f7119SJohn Dyson 
677ae9b8c3aSJohn Dyson 	/*
678ae9b8c3aSJohn Dyson 	 * We make sure that we have allocated a pager before we need
679ae9b8c3aSJohn Dyson 	 * to.
680ae9b8c3aSJohn Dyson 	 */
6813364c323SKonstantin Belousov 	shm_object = vm_pager_allocate(shm_use_phys ? OBJT_PHYS : OBJT_SWAP,
6823364c323SKonstantin Belousov 	    0, size, VM_PROT_DEFAULT, 0, cred);
6833364c323SKonstantin Belousov 	if (shm_object == NULL)
6843364c323SKonstantin Belousov 		return (ENOMEM);
6850049f8b2SAlan Cox 	VM_OBJECT_LOCK(shm_object);
6860049f8b2SAlan Cox 	vm_object_clear_flag(shm_object, OBJ_ONEMAPPING);
6870049f8b2SAlan Cox 	vm_object_set_flag(shm_object, OBJ_NOSPLIT);
6880049f8b2SAlan Cox 	VM_OBJECT_UNLOCK(shm_object);
689cbd8ec09SJohn Dyson 
690b648d480SJohn Baldwin 	shmseg->object = shm_object;
691921d05b9SRobert Watson 	shmseg->u.shm_perm.cuid = shmseg->u.shm_perm.uid = cred->cr_uid;
692921d05b9SRobert Watson 	shmseg->u.shm_perm.cgid = shmseg->u.shm_perm.gid = cred->cr_gid;
693921d05b9SRobert Watson 	shmseg->u.shm_perm.mode = (shmseg->u.shm_perm.mode & SHMSEG_WANTED) |
6943d903220SDoug Rabson 	    (mode & ACCESSPERMS) | SHMSEG_ALLOCATED;
695921d05b9SRobert Watson 	shmseg->u.shm_segsz = uap->size;
696921d05b9SRobert Watson 	shmseg->u.shm_cpid = td->td_proc->p_pid;
697921d05b9SRobert Watson 	shmseg->u.shm_lpid = shmseg->u.shm_nattch = 0;
698921d05b9SRobert Watson 	shmseg->u.shm_atime = shmseg->u.shm_dtime = 0;
69914cedfc8SRobert Watson #ifdef MAC
70030d239bcSRobert Watson 	mac_sysvshm_create(cred, shmseg);
70114cedfc8SRobert Watson #endif
702921d05b9SRobert Watson 	shmseg->u.shm_ctime = time_second;
7033d903220SDoug Rabson 	shm_committed += btoc(size);
7043d903220SDoug Rabson 	shm_nused++;
705921d05b9SRobert Watson 	if (shmseg->u.shm_perm.mode & SHMSEG_WANTED) {
7063d903220SDoug Rabson 		/*
7073d903220SDoug Rabson 		 * Somebody else wanted this key while we were asleep.  Wake
7083d903220SDoug Rabson 		 * them up now.
7093d903220SDoug Rabson 		 */
710921d05b9SRobert Watson 		shmseg->u.shm_perm.mode &= ~SHMSEG_WANTED;
7112cc593fdSAlfred Perlstein 		wakeup(shmseg);
7123d903220SDoug Rabson 	}
713b40ce416SJulian Elischer 	td->td_retval[0] = shmid;
714b618bb96SAlfred Perlstein 	return (0);
7153d903220SDoug Rabson }
7163d903220SDoug Rabson 
71771361470SJohn Baldwin #ifndef _SYS_SYSPROTO_H_
71871361470SJohn Baldwin struct shmget_args {
71971361470SJohn Baldwin 	key_t key;
72071361470SJohn Baldwin 	size_t size;
72171361470SJohn Baldwin 	int shmflg;
72271361470SJohn Baldwin };
72371361470SJohn Baldwin #endif
7243d903220SDoug Rabson int
725b40ce416SJulian Elischer shmget(td, uap)
726b40ce416SJulian Elischer 	struct thread *td;
7273d903220SDoug Rabson 	struct shmget_args *uap;
7283d903220SDoug Rabson {
729b6a4b4f9SMatthew Dillon 	int segnum, mode;
730b6a4b4f9SMatthew Dillon 	int error;
7313d903220SDoug Rabson 
7320304c731SJamie Gritton 	if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
733c6f55f33SJohn Baldwin 		return (ENOSYS);
734b6a4b4f9SMatthew Dillon 	mtx_lock(&Giant);
7353d903220SDoug Rabson 	mode = uap->shmflg & ACCESSPERMS;
7363d903220SDoug Rabson 	if (uap->key != IPC_PRIVATE) {
7373d903220SDoug Rabson 	again:
7383d903220SDoug Rabson 		segnum = shm_find_segment_by_key(uap->key);
7393d903220SDoug Rabson 		if (segnum >= 0) {
740b40ce416SJulian Elischer 			error = shmget_existing(td, uap, mode, segnum);
7413d903220SDoug Rabson 			if (error == EAGAIN)
7423d903220SDoug Rabson 				goto again;
743b6a4b4f9SMatthew Dillon 			goto done2;
7443d903220SDoug Rabson 		}
745b6a4b4f9SMatthew Dillon 		if ((uap->shmflg & IPC_CREAT) == 0) {
746b6a4b4f9SMatthew Dillon 			error = ENOENT;
747b6a4b4f9SMatthew Dillon 			goto done2;
7483d903220SDoug Rabson 		}
749b6a4b4f9SMatthew Dillon 	}
750b40ce416SJulian Elischer 	error = shmget_allocate_segment(td, uap, mode);
751b6a4b4f9SMatthew Dillon done2:
752b6a4b4f9SMatthew Dillon 	mtx_unlock(&Giant);
753b6a4b4f9SMatthew Dillon 	return (error);
7543d903220SDoug Rabson }
7553d903220SDoug Rabson 
75678525ce3SAlfred Perlstein static void
75778525ce3SAlfred Perlstein shmfork_myhook(p1, p2)
7583d903220SDoug Rabson 	struct proc *p1, *p2;
7593d903220SDoug Rabson {
7603d903220SDoug Rabson 	struct shmmap_state *shmmap_s;
7613d903220SDoug Rabson 	size_t size;
7623d903220SDoug Rabson 	int i;
7633d903220SDoug Rabson 
76494ddc707SAlan Cox 	mtx_lock(&Giant);
7653d903220SDoug Rabson 	size = shminfo.shmseg * sizeof(struct shmmap_state);
766a163d034SWarner Losh 	shmmap_s = malloc(size, M_SHM, M_WAITOK);
7672cc593fdSAlfred Perlstein 	bcopy(p1->p_vmspace->vm_shm, shmmap_s, size);
7682cc593fdSAlfred Perlstein 	p2->p_vmspace->vm_shm = shmmap_s;
7693d903220SDoug Rabson 	for (i = 0; i < shminfo.shmseg; i++, shmmap_s++)
7703d903220SDoug Rabson 		if (shmmap_s->shmid != -1)
771921d05b9SRobert Watson 			shmsegs[IPCID_TO_IX(shmmap_s->shmid)].u.shm_nattch++;
77294ddc707SAlan Cox 	mtx_unlock(&Giant);
7733d903220SDoug Rabson }
7743d903220SDoug Rabson 
77578525ce3SAlfred Perlstein static void
7763db161e0SMatthew Dillon shmexit_myhook(struct vmspace *vm)
7773d903220SDoug Rabson {
7783db161e0SMatthew Dillon 	struct shmmap_state *base, *shm;
7793d903220SDoug Rabson 	int i;
7803d903220SDoug Rabson 
7813db161e0SMatthew Dillon 	if ((base = vm->vm_shm) != NULL) {
7823db161e0SMatthew Dillon 		vm->vm_shm = NULL;
7831a276a3fSAlan Cox 		mtx_lock(&Giant);
7843db161e0SMatthew Dillon 		for (i = 0, shm = base; i < shminfo.shmseg; i++, shm++) {
7853db161e0SMatthew Dillon 			if (shm->shmid != -1)
7863db161e0SMatthew Dillon 				shm_delete_mapping(vm, shm);
7873db161e0SMatthew Dillon 		}
7881a276a3fSAlan Cox 		mtx_unlock(&Giant);
7893db161e0SMatthew Dillon 		free(base, M_SHM);
7903db161e0SMatthew Dillon 	}
7913d903220SDoug Rabson }
7923d903220SDoug Rabson 
793255108f3SPeter Wemm static void
794255108f3SPeter Wemm shmrealloc(void)
795255108f3SPeter Wemm {
796255108f3SPeter Wemm 	int i;
797921d05b9SRobert Watson 	struct shmid_kernel *newsegs;
798255108f3SPeter Wemm 
799255108f3SPeter Wemm 	if (shmalloced >= shminfo.shmmni)
800255108f3SPeter Wemm 		return;
801255108f3SPeter Wemm 
802a163d034SWarner Losh 	newsegs = malloc(shminfo.shmmni * sizeof(*newsegs), M_SHM, M_WAITOK);
803255108f3SPeter Wemm 	if (newsegs == NULL)
804255108f3SPeter Wemm 		return;
805255108f3SPeter Wemm 	for (i = 0; i < shmalloced; i++)
806255108f3SPeter Wemm 		bcopy(&shmsegs[i], &newsegs[i], sizeof(newsegs[0]));
807255108f3SPeter Wemm 	for (; i < shminfo.shmmni; i++) {
808921d05b9SRobert Watson 		shmsegs[i].u.shm_perm.mode = SHMSEG_FREE;
809921d05b9SRobert Watson 		shmsegs[i].u.shm_perm.seq = 0;
81014cedfc8SRobert Watson #ifdef MAC
81130d239bcSRobert Watson 		mac_sysvshm_init(&shmsegs[i]);
81214cedfc8SRobert Watson #endif
813255108f3SPeter Wemm 	}
814255108f3SPeter Wemm 	free(shmsegs, M_SHM);
815255108f3SPeter Wemm 	shmsegs = newsegs;
816255108f3SPeter Wemm 	shmalloced = shminfo.shmmni;
817255108f3SPeter Wemm }
818255108f3SPeter Wemm 
819255108f3SPeter Wemm static void
82078525ce3SAlfred Perlstein shminit()
8213d903220SDoug Rabson {
8223d903220SDoug Rabson 	int i;
823255108f3SPeter Wemm 
8244d9d1e82SRuslan Ermilov #ifndef BURN_BRIDGES
8254d9d1e82SRuslan Ermilov 	if (TUNABLE_ULONG_FETCH("kern.ipc.shmmaxpgs", &shminfo.shmall) != 0)
8264d9d1e82SRuslan Ermilov 		printf("kern.ipc.shmmaxpgs is now called kern.ipc.shmall!\n");
8274d9d1e82SRuslan Ermilov #endif
8284d9d1e82SRuslan Ermilov 	TUNABLE_ULONG_FETCH("kern.ipc.shmall", &shminfo.shmall);
8294d9d1e82SRuslan Ermilov 
8304d9d1e82SRuslan Ermilov 	/* Initialize shmmax dealing with possible overflow. */
8319d4156aeSAlfred Perlstein 	for (i = PAGE_SIZE; i > 0; i--) {
832a4c24c66SJohn Baldwin 		shminfo.shmmax = shminfo.shmall * i;
8335015c68aSAlfred Perlstein 		if (shminfo.shmmax >= shminfo.shmall)
8345015c68aSAlfred Perlstein 			break;
8355015c68aSAlfred Perlstein 	}
8364d9d1e82SRuslan Ermilov 
8379baea4b4SChristian S.J. Peron 	TUNABLE_ULONG_FETCH("kern.ipc.shmmin", &shminfo.shmmin);
8389baea4b4SChristian S.J. Peron 	TUNABLE_ULONG_FETCH("kern.ipc.shmmni", &shminfo.shmmni);
8399baea4b4SChristian S.J. Peron 	TUNABLE_ULONG_FETCH("kern.ipc.shmseg", &shminfo.shmseg);
840b3a4bc42SMichael Reifenberger 	TUNABLE_INT_FETCH("kern.ipc.shm_use_phys", &shm_use_phys);
841b3a4bc42SMichael Reifenberger 
842255108f3SPeter Wemm 	shmalloced = shminfo.shmmni;
843a163d034SWarner Losh 	shmsegs = malloc(shmalloced * sizeof(shmsegs[0]), M_SHM, M_WAITOK);
844255108f3SPeter Wemm 	if (shmsegs == NULL)
845255108f3SPeter Wemm 		panic("cannot allocate initial memory for sysvshm");
846255108f3SPeter Wemm 	for (i = 0; i < shmalloced; i++) {
847921d05b9SRobert Watson 		shmsegs[i].u.shm_perm.mode = SHMSEG_FREE;
848921d05b9SRobert Watson 		shmsegs[i].u.shm_perm.seq = 0;
84914cedfc8SRobert Watson #ifdef MAC
85030d239bcSRobert Watson 		mac_sysvshm_init(&shmsegs[i]);
85114cedfc8SRobert Watson #endif
8523d903220SDoug Rabson 	}
8533d903220SDoug Rabson 	shm_last_free = 0;
8543d903220SDoug Rabson 	shm_nused = 0;
8553d903220SDoug Rabson 	shm_committed = 0;
85678525ce3SAlfred Perlstein 	shmexit_hook = &shmexit_myhook;
85778525ce3SAlfred Perlstein 	shmfork_hook = &shmfork_myhook;
8583d903220SDoug Rabson }
85978525ce3SAlfred Perlstein 
86078525ce3SAlfred Perlstein static int
86178525ce3SAlfred Perlstein shmunload()
86278525ce3SAlfred Perlstein {
86314cedfc8SRobert Watson #ifdef MAC
86414cedfc8SRobert Watson 	int i;
86514cedfc8SRobert Watson #endif
86678525ce3SAlfred Perlstein 
86778525ce3SAlfred Perlstein 	if (shm_nused > 0)
86878525ce3SAlfred Perlstein 		return (EBUSY);
86978525ce3SAlfred Perlstein 
87014cedfc8SRobert Watson #ifdef MAC
87114cedfc8SRobert Watson 	for (i = 0; i < shmalloced; i++)
87230d239bcSRobert Watson 		mac_sysvshm_destroy(&shmsegs[i]);
87314cedfc8SRobert Watson #endif
87478525ce3SAlfred Perlstein 	free(shmsegs, M_SHM);
87578525ce3SAlfred Perlstein 	shmexit_hook = NULL;
87678525ce3SAlfred Perlstein 	shmfork_hook = NULL;
87778525ce3SAlfred Perlstein 	return (0);
87878525ce3SAlfred Perlstein }
87978525ce3SAlfred Perlstein 
88078525ce3SAlfred Perlstein static int
881a723c4e1SDima Dorfman sysctl_shmsegs(SYSCTL_HANDLER_ARGS)
882a723c4e1SDima Dorfman {
883a723c4e1SDima Dorfman 
884a723c4e1SDima Dorfman 	return (SYSCTL_OUT(req, shmsegs, shmalloced * sizeof(shmsegs[0])));
885a723c4e1SDima Dorfman }
886a723c4e1SDima Dorfman 
88745f48220SJohn Baldwin #if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43))
88845f48220SJohn Baldwin struct oshmid_ds {
88945f48220SJohn Baldwin 	struct	ipc_perm_old shm_perm;	/* operation perms */
89045f48220SJohn Baldwin 	int	shm_segsz;		/* size of segment (bytes) */
89145f48220SJohn Baldwin 	u_short	shm_cpid;		/* pid, creator */
89245f48220SJohn Baldwin 	u_short	shm_lpid;		/* pid, last operation */
89345f48220SJohn Baldwin 	short	shm_nattch;		/* no. of current attaches */
89445f48220SJohn Baldwin 	time_t	shm_atime;		/* last attach time */
89545f48220SJohn Baldwin 	time_t	shm_dtime;		/* last detach time */
89645f48220SJohn Baldwin 	time_t	shm_ctime;		/* last change time */
89745f48220SJohn Baldwin 	void	*shm_handle;		/* internal handle for shm segment */
89845f48220SJohn Baldwin };
89945f48220SJohn Baldwin 
90045f48220SJohn Baldwin struct oshmctl_args {
90145f48220SJohn Baldwin 	int shmid;
90245f48220SJohn Baldwin 	int cmd;
90345f48220SJohn Baldwin 	struct oshmid_ds *ubuf;
90445f48220SJohn Baldwin };
90545f48220SJohn Baldwin 
90645f48220SJohn Baldwin static int
907ca998284SJohn Baldwin oshmctl(struct thread *td, struct oshmctl_args *uap)
90845f48220SJohn Baldwin {
90945f48220SJohn Baldwin #ifdef COMPAT_43
91045f48220SJohn Baldwin 	int error = 0;
91145f48220SJohn Baldwin 	struct shmid_kernel *shmseg;
91245f48220SJohn Baldwin 	struct oshmid_ds outbuf;
91345f48220SJohn Baldwin 
91445f48220SJohn Baldwin 	if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
91545f48220SJohn Baldwin 		return (ENOSYS);
91645f48220SJohn Baldwin 	mtx_lock(&Giant);
91745f48220SJohn Baldwin 	shmseg = shm_find_segment_by_shmid(uap->shmid);
91845f48220SJohn Baldwin 	if (shmseg == NULL) {
91945f48220SJohn Baldwin 		error = EINVAL;
92045f48220SJohn Baldwin 		goto done2;
92145f48220SJohn Baldwin 	}
92245f48220SJohn Baldwin 	switch (uap->cmd) {
92345f48220SJohn Baldwin 	case IPC_STAT:
92445f48220SJohn Baldwin 		error = ipcperm(td, &shmseg->u.shm_perm, IPC_R);
92545f48220SJohn Baldwin 		if (error)
92645f48220SJohn Baldwin 			goto done2;
92745f48220SJohn Baldwin #ifdef MAC
92845f48220SJohn Baldwin 		error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, uap->cmd);
92945f48220SJohn Baldwin 		if (error != 0)
93045f48220SJohn Baldwin 			goto done2;
93145f48220SJohn Baldwin #endif
93245f48220SJohn Baldwin 		ipcperm_new2old(&shmseg->u.shm_perm, &outbuf.shm_perm);
93345f48220SJohn Baldwin 		outbuf.shm_segsz = shmseg->u.shm_segsz;
93445f48220SJohn Baldwin 		outbuf.shm_cpid = shmseg->u.shm_cpid;
93545f48220SJohn Baldwin 		outbuf.shm_lpid = shmseg->u.shm_lpid;
93645f48220SJohn Baldwin 		outbuf.shm_nattch = shmseg->u.shm_nattch;
93745f48220SJohn Baldwin 		outbuf.shm_atime = shmseg->u.shm_atime;
93845f48220SJohn Baldwin 		outbuf.shm_dtime = shmseg->u.shm_dtime;
93945f48220SJohn Baldwin 		outbuf.shm_ctime = shmseg->u.shm_ctime;
94045f48220SJohn Baldwin 		outbuf.shm_handle = shmseg->object;
94145f48220SJohn Baldwin 		error = copyout(&outbuf, uap->ubuf, sizeof(outbuf));
94245f48220SJohn Baldwin 		if (error)
94345f48220SJohn Baldwin 			goto done2;
94445f48220SJohn Baldwin 		break;
94545f48220SJohn Baldwin 	default:
946af88b2c2SJohn Baldwin 		error = freebsd7_shmctl(td, (struct freebsd7_shmctl_args *)uap);
94745f48220SJohn Baldwin 		break;
94845f48220SJohn Baldwin 	}
94945f48220SJohn Baldwin done2:
95045f48220SJohn Baldwin 	mtx_unlock(&Giant);
95145f48220SJohn Baldwin 	return (error);
95245f48220SJohn Baldwin #else
95345f48220SJohn Baldwin 	return (EINVAL);
95445f48220SJohn Baldwin #endif
95545f48220SJohn Baldwin }
95645f48220SJohn Baldwin 
95745f48220SJohn Baldwin /* XXX casting to (sy_call_t *) is bogus, as usual. */
95845f48220SJohn Baldwin static sy_call_t *shmcalls[] = {
95945f48220SJohn Baldwin 	(sy_call_t *)shmat, (sy_call_t *)oshmctl,
96045f48220SJohn Baldwin 	(sy_call_t *)shmdt, (sy_call_t *)shmget,
961b648d480SJohn Baldwin 	(sy_call_t *)freebsd7_shmctl
96245f48220SJohn Baldwin };
96345f48220SJohn Baldwin 
96445f48220SJohn Baldwin int
96545f48220SJohn Baldwin shmsys(td, uap)
96645f48220SJohn Baldwin 	struct thread *td;
96745f48220SJohn Baldwin 	/* XXX actually varargs. */
96845f48220SJohn Baldwin 	struct shmsys_args /* {
96945f48220SJohn Baldwin 		int	which;
97045f48220SJohn Baldwin 		int	a2;
97145f48220SJohn Baldwin 		int	a3;
97245f48220SJohn Baldwin 		int	a4;
97345f48220SJohn Baldwin 	} */ *uap;
97445f48220SJohn Baldwin {
97545f48220SJohn Baldwin 	int error;
97645f48220SJohn Baldwin 
97745f48220SJohn Baldwin 	if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
97845f48220SJohn Baldwin 		return (ENOSYS);
97945f48220SJohn Baldwin 	if (uap->which < 0 ||
98045f48220SJohn Baldwin 	    uap->which >= sizeof(shmcalls)/sizeof(shmcalls[0]))
98145f48220SJohn Baldwin 		return (EINVAL);
98245f48220SJohn Baldwin 	mtx_lock(&Giant);
98345f48220SJohn Baldwin 	error = (*shmcalls[uap->which])(td, &uap->a2);
98445f48220SJohn Baldwin 	mtx_unlock(&Giant);
98545f48220SJohn Baldwin 	return (error);
98645f48220SJohn Baldwin }
98745f48220SJohn Baldwin 
98845f48220SJohn Baldwin SYSCALL_MODULE_HELPER(shmsys);
98945f48220SJohn Baldwin #endif	/* i386 && (COMPAT_FREEBSD4 || COMPAT_43) */
99045f48220SJohn Baldwin 
991b648d480SJohn Baldwin #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
992b648d480SJohn Baldwin     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
993b648d480SJohn Baldwin 
994b648d480SJohn Baldwin #define CP(src, dst, fld)	do { (dst).fld = (src).fld; } while (0)
995b648d480SJohn Baldwin 
996b648d480SJohn Baldwin 
997b648d480SJohn Baldwin #ifndef _SYS_SYSPROTO_H_
998b648d480SJohn Baldwin struct freebsd7_shmctl_args {
999b648d480SJohn Baldwin 	int shmid;
1000b648d480SJohn Baldwin 	int cmd;
1001b648d480SJohn Baldwin 	struct shmid_ds_old *buf;
1002b648d480SJohn Baldwin };
1003b648d480SJohn Baldwin #endif
1004b648d480SJohn Baldwin int
1005b648d480SJohn Baldwin freebsd7_shmctl(td, uap)
1006b648d480SJohn Baldwin 	struct thread *td;
1007b648d480SJohn Baldwin 	struct freebsd7_shmctl_args *uap;
1008b648d480SJohn Baldwin {
1009b648d480SJohn Baldwin 	int error = 0;
1010b648d480SJohn Baldwin 	struct shmid_ds_old old;
1011b648d480SJohn Baldwin 	struct shmid_ds buf;
1012b648d480SJohn Baldwin 	size_t bufsz;
1013b648d480SJohn Baldwin 
1014b648d480SJohn Baldwin 	/*
1015b648d480SJohn Baldwin 	 * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support
1016b648d480SJohn Baldwin 	 * Linux binaries.  If we see the call come through the FreeBSD ABI,
1017b648d480SJohn Baldwin 	 * return an error back to the user since we do not to support this.
1018b648d480SJohn Baldwin 	 */
1019b648d480SJohn Baldwin 	if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO ||
1020b648d480SJohn Baldwin 	    uap->cmd == SHM_STAT)
1021b648d480SJohn Baldwin 		return (EINVAL);
1022b648d480SJohn Baldwin 
1023b648d480SJohn Baldwin 	/* IPC_SET needs to copyin the buffer before calling kern_shmctl */
1024b648d480SJohn Baldwin 	if (uap->cmd == IPC_SET) {
1025b648d480SJohn Baldwin 		if ((error = copyin(uap->buf, &old, sizeof(old))))
1026b648d480SJohn Baldwin 			goto done;
1027b648d480SJohn Baldwin 		ipcperm_old2new(&old.shm_perm, &buf.shm_perm);
1028b648d480SJohn Baldwin 		CP(old, buf, shm_segsz);
1029b648d480SJohn Baldwin 		CP(old, buf, shm_lpid);
1030b648d480SJohn Baldwin 		CP(old, buf, shm_cpid);
1031b648d480SJohn Baldwin 		CP(old, buf, shm_nattch);
1032b648d480SJohn Baldwin 		CP(old, buf, shm_atime);
1033b648d480SJohn Baldwin 		CP(old, buf, shm_dtime);
1034b648d480SJohn Baldwin 		CP(old, buf, shm_ctime);
1035b648d480SJohn Baldwin 	}
1036b648d480SJohn Baldwin 
1037b648d480SJohn Baldwin 	error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz);
1038b648d480SJohn Baldwin 	if (error)
1039b648d480SJohn Baldwin 		goto done;
1040b648d480SJohn Baldwin 
1041b648d480SJohn Baldwin 	/* Cases in which we need to copyout */
1042b648d480SJohn Baldwin 	switch (uap->cmd) {
1043b648d480SJohn Baldwin 	case IPC_STAT:
1044b648d480SJohn Baldwin 		ipcperm_new2old(&buf.shm_perm, &old.shm_perm);
1045b648d480SJohn Baldwin 		if (buf.shm_segsz > INT_MAX)
1046b648d480SJohn Baldwin 			old.shm_segsz = INT_MAX;
1047b648d480SJohn Baldwin 		else
1048b648d480SJohn Baldwin 			CP(buf, old, shm_segsz);
1049b648d480SJohn Baldwin 		CP(buf, old, shm_lpid);
1050b648d480SJohn Baldwin 		CP(buf, old, shm_cpid);
1051b648d480SJohn Baldwin 		if (buf.shm_nattch > SHRT_MAX)
1052b648d480SJohn Baldwin 			old.shm_nattch = SHRT_MAX;
1053b648d480SJohn Baldwin 		else
1054b648d480SJohn Baldwin 			CP(buf, old, shm_nattch);
1055b648d480SJohn Baldwin 		CP(buf, old, shm_atime);
1056b648d480SJohn Baldwin 		CP(buf, old, shm_dtime);
1057b648d480SJohn Baldwin 		CP(buf, old, shm_ctime);
1058b648d480SJohn Baldwin 		old.shm_internal = NULL;
1059b648d480SJohn Baldwin 		error = copyout(&old, uap->buf, sizeof(old));
1060b648d480SJohn Baldwin 		break;
1061b648d480SJohn Baldwin 	}
1062b648d480SJohn Baldwin 
1063b648d480SJohn Baldwin done:
1064b648d480SJohn Baldwin 	if (error) {
1065b648d480SJohn Baldwin 		/* Invalidate the return value */
1066b648d480SJohn Baldwin 		td->td_retval[0] = -1;
1067b648d480SJohn Baldwin 	}
1068b648d480SJohn Baldwin 	return (error);
1069b648d480SJohn Baldwin }
1070b648d480SJohn Baldwin 
1071b648d480SJohn Baldwin SYSCALL_MODULE_HELPER(freebsd7_shmctl);
1072b648d480SJohn Baldwin 
1073b648d480SJohn Baldwin #undef CP
1074b648d480SJohn Baldwin 
1075b648d480SJohn Baldwin #endif	/* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 ||
1076b648d480SJohn Baldwin 	   COMPAT_FREEBSD7 */
1077b648d480SJohn Baldwin 
1078a723c4e1SDima Dorfman static int
107978525ce3SAlfred Perlstein sysvshm_modload(struct module *module, int cmd, void *arg)
108078525ce3SAlfred Perlstein {
108178525ce3SAlfred Perlstein 	int error = 0;
108278525ce3SAlfred Perlstein 
108378525ce3SAlfred Perlstein 	switch (cmd) {
108478525ce3SAlfred Perlstein 	case MOD_LOAD:
108578525ce3SAlfred Perlstein 		shminit();
108678525ce3SAlfred Perlstein 		break;
108778525ce3SAlfred Perlstein 	case MOD_UNLOAD:
108878525ce3SAlfred Perlstein 		error = shmunload();
108978525ce3SAlfred Perlstein 		break;
109078525ce3SAlfred Perlstein 	case MOD_SHUTDOWN:
109178525ce3SAlfred Perlstein 		break;
109278525ce3SAlfred Perlstein 	default:
109378525ce3SAlfred Perlstein 		error = EINVAL;
109478525ce3SAlfred Perlstein 		break;
109578525ce3SAlfred Perlstein 	}
109678525ce3SAlfred Perlstein 	return (error);
109778525ce3SAlfred Perlstein }
109878525ce3SAlfred Perlstein 
1099faa784b7SDag-Erling Smørgrav static moduledata_t sysvshm_mod = {
1100faa784b7SDag-Erling Smørgrav 	"sysvshm",
110178525ce3SAlfred Perlstein 	&sysvshm_modload,
110278525ce3SAlfred Perlstein 	NULL
110378525ce3SAlfred Perlstein };
110478525ce3SAlfred Perlstein 
110521d56e9cSAlfred Perlstein SYSCALL_MODULE_HELPER(shmat);
110621d56e9cSAlfred Perlstein SYSCALL_MODULE_HELPER(shmctl);
110721d56e9cSAlfred Perlstein SYSCALL_MODULE_HELPER(shmdt);
110821d56e9cSAlfred Perlstein SYSCALL_MODULE_HELPER(shmget);
110978525ce3SAlfred Perlstein 
111071361470SJohn Baldwin DECLARE_MODULE(sysvshm, sysvshm_mod, SI_SUB_SYSV_SHM, SI_ORDER_FIRST);
1111faa784b7SDag-Erling Smørgrav MODULE_VERSION(sysvshm, 1);
1112