2 * Implementation of SVID semaphores
4 * Author: Daniel Boulet
6 * This software is provided ``AS IS'' without any warranties of any kind.
9 * SPDX-License-Identifier: BSD-2-Clause
11 * Copyright (c) 2003-2005 McAfee, Inc.
12 * Copyright (c) 2016-2017 Robert N. M. Watson
13 * All rights reserved.
15 * This software was developed for the FreeBSD Project in part by McAfee
16 * Research, the Security Research Division of McAfee, Inc under DARPA/SPAWAR
17 * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS research
20 * Portions of this software were developed by BAE Systems, the University of
21 * Cambridge Computer Laboratory, and Memorial University under DARPA/AFRL
22 * contract FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent
23 * Computing (TC) research program.
25 * Redistribution and use in source and binary forms, with or without
26 * modification, are permitted provided that the following conditions
28 * 1. Redistributions of source code must retain the above copyright
29 * notice, this list of conditions and the following disclaimer.
30 * 2. Redistributions in binary form must reproduce the above copyright
31 * notice, this list of conditions and the following disclaimer in the
32 * documentation and/or other materials provided with the distribution.
34 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
35 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
36 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
37 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
38 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
39 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
40 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
41 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
42 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
43 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
47 #include <sys/cdefs.h>
48 #include "opt_sysvipc.h"
50 #include <sys/param.h>
51 #include <sys/systm.h>
52 #include <sys/sysproto.h>
53 #include <sys/abi_compat.h>
54 #include <sys/eventhandler.h>
55 #include <sys/kernel.h>
58 #include <sys/module.h>
59 #include <sys/mutex.h>
60 #include <sys/racct.h>
63 #include <sys/syscall.h>
64 #include <sys/syscallsubr.h>
65 #include <sys/sysent.h>
66 #include <sys/sysctl.h>
68 #include <sys/malloc.h>
71 #include <security/audit/audit.h>
72 #include <security/mac/mac_framework.h>
74 FEATURE(sysv_sem, "System V semaphores support");
76 static MALLOC_DEFINE(M_SEM, "sem", "SVID compatible semaphores");
79 #define DPRINTF(a) printf a
84 static int seminit(void);
85 static int sysvsem_modload(struct module *, int, void *);
86 static int semunload(void);
87 static void semexit_myhook(void *arg, struct proc *p);
88 static int sysctl_sema(SYSCTL_HANDLER_ARGS);
89 static int semvalid(int semid, struct prison *rpr,
90 struct semid_kernel *semakptr);
91 static void sem_remove(int semidx, struct ucred *cred);
92 static struct prison *sem_find_prison(struct ucred *);
93 static int sem_prison_cansee(struct prison *, struct semid_kernel *);
94 static int sem_prison_check(void *, void *);
95 static int sem_prison_set(void *, void *);
96 static int sem_prison_get(void *, void *);
97 static int sem_prison_remove(void *, void *);
98 static void sem_prison_cleanup(struct prison *);
100 #ifndef _SYS_SYSPROTO_H_
101 struct __semctl_args;
102 int __semctl(struct thread *td, struct __semctl_args *uap);
104 int semget(struct thread *td, struct semget_args *uap);
106 int semop(struct thread *td, struct semop_args *uap);
109 static struct sem_undo *semu_alloc(struct thread *td);
110 static int semundo_adjust(struct thread *td, struct sem_undo **supptr,
111 int semid, int semseq, int semnum, int adjval);
112 static void semundo_clear(int semid, int semnum);
114 static struct mtx sem_mtx; /* semaphore global lock */
115 static struct mtx sem_undo_mtx;
116 static int semtot = 0;
117 static struct semid_kernel *sema; /* semaphore id pool */
118 static struct mtx *sema_mtx; /* semaphore id pool mutexes*/
119 static struct sem *sem; /* semaphore pool */
120 LIST_HEAD(, sem_undo) semu_list; /* list of active undo structures */
121 LIST_HEAD(, sem_undo) semu_free_list; /* list of free undo structures */
122 static int *semu; /* undo structure pool */
123 static eventhandler_tag semexit_tag;
124 static unsigned sem_prison_slot; /* prison OSD slot */
126 #define SEMUNDO_MTX sem_undo_mtx
127 #define SEMUNDO_LOCK() mtx_lock(&SEMUNDO_MTX);
128 #define SEMUNDO_UNLOCK() mtx_unlock(&SEMUNDO_MTX);
129 #define SEMUNDO_LOCKASSERT(how) mtx_assert(&SEMUNDO_MTX, (how));
132 u_short semval; /* semaphore value */
133 pid_t sempid; /* pid of last operation */
134 u_short semncnt; /* # awaiting semval > cval */
135 u_short semzcnt; /* # awaiting semval = 0 */
139 * Undo structure (one per process)
142 LIST_ENTRY(sem_undo) un_next; /* ptr to next active undo structure */
143 struct proc *un_proc; /* owner of this structure */
144 short un_cnt; /* # of active entries */
146 short un_adjval; /* adjust on exit values */
147 short un_num; /* semaphore # */
148 int un_id; /* semid */
149 unsigned short un_seq;
150 } un_ent[1]; /* undo entries */
154 * Configuration parameters
157 #define SEMMNI 50 /* # of semaphore identifiers */
160 #define SEMMNS 340 /* # of semaphores in system */
163 #define SEMUME 50 /* max # of undo entries per process */
166 #define SEMMNU 150 /* # of undo structures in system */
169 /* shouldn't need tuning */
171 #define SEMMSL SEMMNS /* max # of semaphores per id */
174 #define SEMOPM 100 /* max # of operations per semop call */
177 #define SEMVMX 32767 /* semaphore maximum value */
178 #define SEMAEM 16384 /* adjust on exit max value */
181 * Due to the way semaphore memory is allocated, we have to ensure that
182 * SEMUSZ is properly aligned.
185 #define SEM_ALIGN(bytes) roundup2(bytes, sizeof(long))
187 /* actual size of an undo structure */
188 #define SEMUSZ(x) SEM_ALIGN(offsetof(struct sem_undo, un_ent[(x)]))
191 * Macro to find a particular sem_undo vector
194 ((struct sem_undo *)(((intptr_t)semu) + (ix) * seminfo.semusz))
197 * semaphore info struct
199 struct seminfo seminfo = {
200 .semmni = SEMMNI, /* # of semaphore identifiers */
201 .semmns = SEMMNS, /* # of semaphores in system */
202 .semmnu = SEMMNU, /* # of undo structures in system */
203 .semmsl = SEMMSL, /* max # of semaphores per id */
204 .semopm = SEMOPM, /* max # of operations per semop call */
205 .semume = SEMUME, /* max # of undo entries per process */
206 .semusz = SEMUSZ(SEMUME), /* size in bytes of undo structure */
207 .semvmx = SEMVMX, /* semaphore maximum value */
208 .semaem = SEMAEM, /* adjust on exit max value */
211 SYSCTL_INT(_kern_ipc, OID_AUTO, semmni, CTLFLAG_RDTUN, &seminfo.semmni, 0,
212 "Number of semaphore identifiers");
213 SYSCTL_INT(_kern_ipc, OID_AUTO, semmns, CTLFLAG_RDTUN, &seminfo.semmns, 0,
214 "Maximum number of semaphores in the system");
215 SYSCTL_INT(_kern_ipc, OID_AUTO, semmnu, CTLFLAG_RDTUN, &seminfo.semmnu, 0,
216 "Maximum number of undo structures in the system");
217 SYSCTL_INT(_kern_ipc, OID_AUTO, semmsl, CTLFLAG_RWTUN, &seminfo.semmsl, 0,
218 "Max semaphores per id");
219 SYSCTL_INT(_kern_ipc, OID_AUTO, semopm, CTLFLAG_RDTUN, &seminfo.semopm, 0,
220 "Max operations per semop call");
221 SYSCTL_INT(_kern_ipc, OID_AUTO, semume, CTLFLAG_RDTUN, &seminfo.semume, 0,
222 "Max undo entries per process");
223 SYSCTL_INT(_kern_ipc, OID_AUTO, semusz, CTLFLAG_RD, &seminfo.semusz, 0,
224 "Size in bytes of undo structure");
225 SYSCTL_INT(_kern_ipc, OID_AUTO, semvmx, CTLFLAG_RWTUN, &seminfo.semvmx, 0,
226 "Semaphore maximum value");
227 SYSCTL_INT(_kern_ipc, OID_AUTO, semaem, CTLFLAG_RWTUN, &seminfo.semaem, 0,
228 "Adjust on exit max value");
229 SYSCTL_PROC(_kern_ipc, OID_AUTO, sema,
230 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE,
231 NULL, 0, sysctl_sema, "",
232 "Array of struct semid_kernel for each potential semaphore");
234 static struct syscall_helper_data sem_syscalls[] = {
235 SYSCALL_INIT_HELPER(__semctl),
236 SYSCALL_INIT_HELPER(semget),
237 SYSCALL_INIT_HELPER(semop),
238 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
239 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
240 SYSCALL_INIT_HELPER(semsys),
241 SYSCALL_INIT_HELPER_COMPAT(freebsd7___semctl),
246 #ifdef COMPAT_FREEBSD32
247 #include <compat/freebsd32/freebsd32.h>
248 #include <compat/freebsd32/freebsd32_ipc.h>
249 #include <compat/freebsd32/freebsd32_proto.h>
250 #include <compat/freebsd32/freebsd32_signal.h>
251 #include <compat/freebsd32/freebsd32_syscall.h>
252 #include <compat/freebsd32/freebsd32_util.h>
254 static struct syscall_helper_data sem32_syscalls[] = {
255 SYSCALL32_INIT_HELPER(freebsd32_semctl),
256 SYSCALL32_INIT_HELPER_COMPAT(semget),
257 SYSCALL32_INIT_HELPER_COMPAT(semop),
258 SYSCALL32_INIT_HELPER(freebsd32_semsys),
259 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
260 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
261 SYSCALL32_INIT_HELPER(freebsd7_freebsd32_semctl),
273 osd_method_t methods[PR_MAXMETHOD] = {
274 [PR_METHOD_CHECK] = sem_prison_check,
275 [PR_METHOD_SET] = sem_prison_set,
276 [PR_METHOD_GET] = sem_prison_get,
277 [PR_METHOD_REMOVE] = sem_prison_remove,
280 sem = malloc(sizeof(struct sem) * seminfo.semmns, M_SEM, M_WAITOK);
281 sema = malloc(sizeof(struct semid_kernel) * seminfo.semmni, M_SEM,
283 sema_mtx = malloc(sizeof(struct mtx) * seminfo.semmni, M_SEM,
285 seminfo.semusz = SEMUSZ(seminfo.semume);
286 semu = malloc(seminfo.semmnu * seminfo.semusz, M_SEM, M_WAITOK);
288 for (i = 0; i < seminfo.semmni; i++) {
289 sema[i].u.__sem_base = 0;
290 sema[i].u.sem_perm.mode = 0;
291 sema[i].u.sem_perm.seq = 0;
293 mac_sysvsem_init(&sema[i]);
296 for (i = 0; i < seminfo.semmni; i++)
297 mtx_init(&sema_mtx[i], "semid", NULL, MTX_DEF);
298 LIST_INIT(&semu_free_list);
299 for (i = 0; i < seminfo.semmnu; i++) {
300 struct sem_undo *suptr = SEMU(i);
301 suptr->un_proc = NULL;
302 LIST_INSERT_HEAD(&semu_free_list, suptr, un_next);
304 LIST_INIT(&semu_list);
305 mtx_init(&sem_mtx, "sem", NULL, MTX_DEF);
306 mtx_init(&sem_undo_mtx, "semu", NULL, MTX_DEF);
307 semexit_tag = EVENTHANDLER_REGISTER(process_exit, semexit_myhook, NULL,
308 EVENTHANDLER_PRI_ANY);
310 /* Set current prisons according to their allow.sysvipc. */
311 sem_prison_slot = osd_jail_register(NULL, methods);
312 rsv = osd_reserve(sem_prison_slot);
313 prison_lock(&prison0);
314 (void)osd_jail_set_reserved(&prison0, sem_prison_slot, rsv, &prison0);
315 prison_unlock(&prison0);
317 sx_slock(&allprison_lock);
318 TAILQ_FOREACH(pr, &allprison, pr_list) {
320 rsv = osd_reserve(sem_prison_slot);
322 if (pr->pr_allow & PR_ALLOW_SYSVIPC) {
323 (void)osd_jail_set_reserved(pr, sem_prison_slot, rsv,
330 osd_free_reserved(rsv);
331 sx_sunlock(&allprison_lock);
333 error = syscall_helper_register(sem_syscalls, SY_THR_STATIC_KLD);
336 #ifdef COMPAT_FREEBSD32
337 error = syscall32_helper_register(sem32_syscalls, SY_THR_STATIC_KLD);
353 #ifdef COMPAT_FREEBSD32
354 syscall32_helper_unregister(sem32_syscalls);
356 syscall_helper_unregister(sem_syscalls);
357 EVENTHANDLER_DEREGISTER(process_exit, semexit_tag);
358 if (sem_prison_slot != 0)
359 osd_jail_deregister(sem_prison_slot);
361 for (i = 0; i < seminfo.semmni; i++)
362 mac_sysvsem_destroy(&sema[i]);
367 for (i = 0; i < seminfo.semmni; i++)
368 mtx_destroy(&sema_mtx[i]);
369 free(sema_mtx, M_SEM);
370 mtx_destroy(&sem_mtx);
371 mtx_destroy(&sem_undo_mtx);
376 sysvsem_modload(struct module *module, int cmd, void *arg)
396 static moduledata_t sysvsem_mod = {
402 DECLARE_MODULE(sysvsem, sysvsem_mod, SI_SUB_SYSV_SEM, SI_ORDER_FIRST);
403 MODULE_VERSION(sysvsem, 1);
406 * Allocate a new sem_undo structure for a process
407 * (returns ptr to structure or NULL if no more room)
410 static struct sem_undo *
411 semu_alloc(struct thread *td)
413 struct sem_undo *suptr;
415 SEMUNDO_LOCKASSERT(MA_OWNED);
416 if ((suptr = LIST_FIRST(&semu_free_list)) == NULL)
418 LIST_REMOVE(suptr, un_next);
419 LIST_INSERT_HEAD(&semu_list, suptr, un_next);
421 suptr->un_proc = td->td_proc;
426 semu_try_free(struct sem_undo *suptr)
429 SEMUNDO_LOCKASSERT(MA_OWNED);
431 if (suptr->un_cnt != 0)
433 LIST_REMOVE(suptr, un_next);
434 LIST_INSERT_HEAD(&semu_free_list, suptr, un_next);
439 * Adjust a particular entry for a particular proc
443 semundo_adjust(struct thread *td, struct sem_undo **supptr, int semid,
444 int semseq, int semnum, int adjval)
446 struct proc *p = td->td_proc;
447 struct sem_undo *suptr;
451 SEMUNDO_LOCKASSERT(MA_OWNED);
452 /* Look for and remember the sem_undo if the caller doesn't provide
457 LIST_FOREACH(suptr, &semu_list, un_next) {
458 if (suptr->un_proc == p) {
466 suptr = semu_alloc(td);
474 * Look for the requested entry and adjust it (delete if adjval becomes
477 sunptr = &suptr->un_ent[0];
478 for (i = 0; i < suptr->un_cnt; i++, sunptr++) {
479 if (sunptr->un_id != semid || sunptr->un_num != semnum)
482 adjval += sunptr->un_adjval;
483 if (adjval > seminfo.semaem || adjval < -seminfo.semaem)
486 sunptr->un_adjval = adjval;
487 if (sunptr->un_adjval == 0) {
489 if (i < suptr->un_cnt)
491 suptr->un_ent[suptr->un_cnt];
492 if (suptr->un_cnt == 0)
493 semu_try_free(suptr);
498 /* Didn't find the right entry - create it */
501 if (adjval > seminfo.semaem || adjval < -seminfo.semaem)
503 if (suptr->un_cnt != seminfo.semume) {
504 sunptr = &suptr->un_ent[suptr->un_cnt];
506 sunptr->un_adjval = adjval;
507 sunptr->un_id = semid;
508 sunptr->un_num = semnum;
509 sunptr->un_seq = semseq;
516 semundo_clear(int semid, int semnum)
518 struct sem_undo *suptr, *suptr1;
522 SEMUNDO_LOCKASSERT(MA_OWNED);
523 LIST_FOREACH_SAFE(suptr, &semu_list, un_next, suptr1) {
524 sunptr = &suptr->un_ent[0];
525 for (i = 0; i < suptr->un_cnt; i++, sunptr++) {
526 if (sunptr->un_id != semid)
528 if (semnum == -1 || sunptr->un_num == semnum) {
530 if (i < suptr->un_cnt) {
532 suptr->un_ent[suptr->un_cnt];
535 semu_try_free(suptr);
544 semvalid(int semid, struct prison *rpr, struct semid_kernel *semakptr)
547 return ((semakptr->u.sem_perm.mode & SEM_ALLOC) == 0 ||
548 semakptr->u.sem_perm.seq != IPCID_TO_SEQ(semid) ||
549 sem_prison_cansee(rpr, semakptr) ? EINVAL : 0);
553 sem_remove(int semidx, struct ucred *cred)
555 struct semid_kernel *semakptr;
558 KASSERT(semidx >= 0 && semidx < seminfo.semmni,
559 ("semidx out of bounds"));
560 mtx_assert(&sem_mtx, MA_OWNED);
561 semakptr = &sema[semidx];
562 KASSERT(semakptr->u.__sem_base - sem + semakptr->u.sem_nsems <= semtot,
563 ("sem_remove: sema %d corrupted sem pointer %p %p %d %d",
564 semidx, semakptr->u.__sem_base, sem, semakptr->u.sem_nsems,
567 semakptr->u.sem_perm.cuid = cred ? cred->cr_uid : 0;
568 semakptr->u.sem_perm.uid = cred ? cred->cr_uid : 0;
569 semakptr->u.sem_perm.mode = 0;
570 racct_sub_cred(semakptr->cred, RACCT_NSEM, semakptr->u.sem_nsems);
571 crfree(semakptr->cred);
572 semakptr->cred = NULL;
574 semundo_clear(semidx, -1);
577 mac_sysvsem_cleanup(semakptr);
580 for (i = 0; i < seminfo.semmni; i++) {
581 if ((sema[i].u.sem_perm.mode & SEM_ALLOC) &&
582 sema[i].u.__sem_base > semakptr->u.__sem_base)
583 mtx_lock_flags(&sema_mtx[i], LOP_DUPOK);
585 for (i = semakptr->u.__sem_base - sem + semakptr->u.sem_nsems;
587 sem[i - semakptr->u.sem_nsems] = sem[i];
588 for (i = 0; i < seminfo.semmni; i++) {
589 if ((sema[i].u.sem_perm.mode & SEM_ALLOC) &&
590 sema[i].u.__sem_base > semakptr->u.__sem_base) {
591 sema[i].u.__sem_base -= semakptr->u.sem_nsems;
592 mtx_unlock(&sema_mtx[i]);
595 semtot -= semakptr->u.sem_nsems;
598 static struct prison *
599 sem_find_prison(struct ucred *cred)
601 struct prison *pr, *rpr;
603 pr = cred->cr_prison;
605 rpr = osd_jail_get(pr, sem_prison_slot);
611 sem_prison_cansee(struct prison *rpr, struct semid_kernel *semakptr)
614 if (semakptr->cred == NULL ||
615 !(rpr == semakptr->cred->cr_prison ||
616 prison_ischild(rpr, semakptr->cred->cr_prison)))
622 * Note that the user-mode half of this passes a union, not a pointer.
624 #ifndef _SYS_SYSPROTO_H_
625 struct __semctl_args {
633 sys___semctl(struct thread *td, struct __semctl_args *uap)
635 struct semid_ds dsbuf;
636 union semun arg, semun;
647 error = copyin(uap->arg, &arg, sizeof(arg));
659 error = copyin(arg.buf, &dsbuf, sizeof(dsbuf));
666 semun.array = arg.array;
673 error = kern_semctl(td, uap->semid, uap->semnum, uap->cmd, &semun,
681 error = copyout(&dsbuf, arg.buf, sizeof(dsbuf));
686 td->td_retval[0] = rval;
691 kern_semctl(struct thread *td, int semid, int semnum, int cmd,
692 union semun *arg, register_t *rval)
695 struct ucred *cred = td->td_ucred;
698 struct semid_ds *sbuf;
699 struct semid_kernel *semakptr;
700 struct mtx *sema_mtxp;
701 u_short usval, count;
704 DPRINTF(("call to semctl(%d, %d, %d, 0x%p)\n",
705 semid, semnum, cmd, arg));
707 AUDIT_ARG_SVIPC_CMD(cmd);
708 AUDIT_ARG_SVIPC_ID(semid);
710 rpr = sem_find_prison(td->td_ucred);
719 * For this command we assume semid is an array index
720 * rather than an IPC id.
722 if (semid < 0 || semid >= seminfo.semmni)
724 semakptr = &sema[semid];
725 sema_mtxp = &sema_mtx[semid];
727 if ((semakptr->u.sem_perm.mode & SEM_ALLOC) == 0) {
731 if ((error = sem_prison_cansee(rpr, semakptr)))
733 if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_R)))
736 error = mac_sysvsem_check_semctl(cred, semakptr, cmd);
740 bcopy(&semakptr->u, arg->buf, sizeof(struct semid_ds));
741 if (cred->cr_prison != semakptr->cred->cr_prison)
742 arg->buf->sem_perm.key = IPC_PRIVATE;
743 *rval = IXSEQ_TO_IPCID(semid, semakptr->u.sem_perm);
744 mtx_unlock(sema_mtxp);
748 semidx = IPCID_TO_IX(semid);
749 if (semidx < 0 || semidx >= seminfo.semmni)
752 semakptr = &sema[semidx];
753 sema_mtxp = &sema_mtx[semidx];
759 error = mac_sysvsem_check_semctl(cred, semakptr, cmd);
769 if ((error = semvalid(semid, rpr, semakptr)) != 0)
771 if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_M)))
773 sem_remove(semidx, cred);
777 AUDIT_ARG_SVIPC_PERM(&arg->buf->sem_perm);
778 if ((error = semvalid(semid, rpr, semakptr)) != 0)
780 if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_M)))
783 semakptr->u.sem_perm.uid = sbuf->sem_perm.uid;
784 semakptr->u.sem_perm.gid = sbuf->sem_perm.gid;
785 semakptr->u.sem_perm.mode = (semakptr->u.sem_perm.mode &
786 ~0777) | (sbuf->sem_perm.mode & 0777);
787 semakptr->u.sem_ctime = time_second;
791 if ((error = semvalid(semid, rpr, semakptr)) != 0)
793 if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_R)))
795 bcopy(&semakptr->u, arg->buf, sizeof(struct semid_ds));
796 if (cred->cr_prison != semakptr->cred->cr_prison)
797 arg->buf->sem_perm.key = IPC_PRIVATE;
800 * Try to hide the fact that the structure layout is shared by
801 * both the kernel and userland. This pointer is not useful to
804 arg->buf->__sem_base = NULL;
808 if ((error = semvalid(semid, rpr, semakptr)) != 0)
810 if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_R)))
812 if (semnum < 0 || semnum >= semakptr->u.sem_nsems) {
816 *rval = semakptr->u.__sem_base[semnum].semncnt;
820 if ((error = semvalid(semid, rpr, semakptr)) != 0)
822 if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_R)))
824 if (semnum < 0 || semnum >= semakptr->u.sem_nsems) {
828 *rval = semakptr->u.__sem_base[semnum].sempid;
832 if ((error = semvalid(semid, rpr, semakptr)) != 0)
834 if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_R)))
836 if (semnum < 0 || semnum >= semakptr->u.sem_nsems) {
840 *rval = semakptr->u.__sem_base[semnum].semval;
845 * Unfortunately, callers of this function don't know
846 * in advance how many semaphores are in this set.
847 * While we could just allocate the maximum size array
848 * and pass the actual size back to the caller, that
849 * won't work for SETALL since we can't copyin() more
850 * data than the user specified as we may return a
853 * Note that the number of semaphores in a set is
854 * fixed for the life of that set. The only way that
855 * the 'count' could change while are blocked in
856 * malloc() is if this semaphore set were destroyed
857 * and a new one created with the same index.
858 * However, semvalid() will catch that due to the
859 * sequence number unless exactly 0x8000 (or a
860 * multiple thereof) semaphore sets for the same index
861 * are created and destroyed while we are in malloc!
864 count = semakptr->u.sem_nsems;
865 mtx_unlock(sema_mtxp);
866 array = malloc(sizeof(*array) * count, M_TEMP, M_WAITOK);
868 if ((error = semvalid(semid, rpr, semakptr)) != 0)
870 KASSERT(count == semakptr->u.sem_nsems, ("nsems changed"));
871 if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_R)))
873 for (i = 0; i < semakptr->u.sem_nsems; i++)
874 array[i] = semakptr->u.__sem_base[i].semval;
875 mtx_unlock(sema_mtxp);
876 error = copyout(array, arg->array, count * sizeof(*array));
881 if ((error = semvalid(semid, rpr, semakptr)) != 0)
883 if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_R)))
885 if (semnum < 0 || semnum >= semakptr->u.sem_nsems) {
889 *rval = semakptr->u.__sem_base[semnum].semzcnt;
893 if ((error = semvalid(semid, rpr, semakptr)) != 0)
895 if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_W)))
897 if (semnum < 0 || semnum >= semakptr->u.sem_nsems) {
901 if (arg->val < 0 || arg->val > seminfo.semvmx) {
905 semakptr->u.__sem_base[semnum].semval = arg->val;
907 semundo_clear(semidx, semnum);
914 * See comment on GETALL for why 'count' shouldn't change
915 * and why we require a userland buffer.
917 count = semakptr->u.sem_nsems;
918 mtx_unlock(sema_mtxp);
919 array = malloc(sizeof(*array) * count, M_TEMP, M_WAITOK);
920 error = copyin(arg->array, array, count * sizeof(*array));
924 if ((error = semvalid(semid, rpr, semakptr)) != 0)
926 KASSERT(count == semakptr->u.sem_nsems, ("nsems changed"));
927 if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_W)))
929 for (i = 0; i < semakptr->u.sem_nsems; i++) {
931 if (usval > seminfo.semvmx) {
935 semakptr->u.__sem_base[i].semval = usval;
938 semundo_clear(semidx, -1);
949 mtx_unlock(sema_mtxp);
951 mtx_unlock(&sem_mtx);
957 #ifndef _SYS_SYSPROTO_H_
965 sys_semget(struct thread *td, struct semget_args *uap)
967 int semid, error = 0;
969 int nsems = uap->nsems;
970 int semflg = uap->semflg;
971 struct ucred *cred = td->td_ucred;
973 DPRINTF(("semget(0x%x, %d, 0%o)\n", key, nsems, semflg));
975 AUDIT_ARG_VALUE(semflg);
977 if (sem_find_prison(cred) == NULL)
981 if (key != IPC_PRIVATE) {
982 for (semid = 0; semid < seminfo.semmni; semid++) {
983 if ((sema[semid].u.sem_perm.mode & SEM_ALLOC) &&
984 sema[semid].cred != NULL &&
985 sema[semid].cred->cr_prison == cred->cr_prison &&
986 sema[semid].u.sem_perm.key == key)
989 if (semid < seminfo.semmni) {
990 AUDIT_ARG_SVIPC_ID(semid);
991 DPRINTF(("found public key\n"));
992 if ((semflg & IPC_CREAT) && (semflg & IPC_EXCL)) {
993 DPRINTF(("not exclusive\n"));
997 if ((error = ipcperm(td, &sema[semid].u.sem_perm,
1001 if (nsems > 0 && sema[semid].u.sem_nsems < nsems) {
1002 DPRINTF(("too small\n"));
1007 error = mac_sysvsem_check_semget(cred, &sema[semid]);
1015 DPRINTF(("need to allocate the semid_kernel\n"));
1016 if (key == IPC_PRIVATE || (semflg & IPC_CREAT)) {
1017 if (nsems <= 0 || nsems > seminfo.semmsl) {
1018 DPRINTF(("nsems out of range (0<%d<=%d)\n", nsems,
1023 if (nsems > seminfo.semmns - semtot) {
1025 "not enough semaphores left (need %d, got %d)\n",
1026 nsems, seminfo.semmns - semtot));
1030 for (semid = 0; semid < seminfo.semmni; semid++) {
1031 if ((sema[semid].u.sem_perm.mode & SEM_ALLOC) == 0)
1034 if (semid == seminfo.semmni) {
1035 DPRINTF(("no more semid_kernel's available\n"));
1041 PROC_LOCK(td->td_proc);
1042 error = racct_add(td->td_proc, RACCT_NSEM, nsems);
1043 PROC_UNLOCK(td->td_proc);
1050 DPRINTF(("semid %d is available\n", semid));
1051 mtx_lock(&sema_mtx[semid]);
1052 KASSERT((sema[semid].u.sem_perm.mode & SEM_ALLOC) == 0,
1053 ("Lost semaphore %d", semid));
1054 sema[semid].u.sem_perm.key = key;
1055 sema[semid].u.sem_perm.cuid = cred->cr_uid;
1056 sema[semid].u.sem_perm.uid = cred->cr_uid;
1057 sema[semid].u.sem_perm.cgid = cred->cr_gid;
1058 sema[semid].u.sem_perm.gid = cred->cr_gid;
1059 sema[semid].u.sem_perm.mode = (semflg & 0777) | SEM_ALLOC;
1060 sema[semid].cred = crhold(cred);
1061 sema[semid].u.sem_perm.seq =
1062 (sema[semid].u.sem_perm.seq + 1) & 0x7fff;
1063 sema[semid].u.sem_nsems = nsems;
1064 sema[semid].u.sem_otime = 0;
1065 sema[semid].u.sem_ctime = time_second;
1066 sema[semid].u.__sem_base = &sem[semtot];
1068 bzero(sema[semid].u.__sem_base,
1069 sizeof(sema[semid].u.__sem_base[0])*nsems);
1071 mac_sysvsem_create(cred, &sema[semid]);
1073 mtx_unlock(&sema_mtx[semid]);
1074 DPRINTF(("sembase = %p, next = %p\n",
1075 sema[semid].u.__sem_base, &sem[semtot]));
1077 DPRINTF(("didn't find it and wasn't asked to create it\n"));
1083 td->td_retval[0] = IXSEQ_TO_IPCID(semid, sema[semid].u.sem_perm);
1085 mtx_unlock(&sem_mtx);
1089 #ifndef _SYS_SYSPROTO_H_
1092 struct sembuf *sops;
1097 sys_semop(struct thread *td, struct semop_args *uap)
1100 return (kern_semop(td, uap->semid, uap->sops, uap->nsops, NULL));
1104 kern_semop(struct thread *td, int usemid, struct sembuf *usops,
1105 size_t nsops, struct timespec *timeout)
1107 #define SMALL_SOPS 8
1108 struct sembuf small_sops[SMALL_SOPS];
1111 struct sembuf *sops;
1112 struct semid_kernel *semakptr;
1113 struct sembuf *sopptr = NULL;
1114 struct sem *semptr = NULL;
1115 struct sem_undo *suptr;
1116 struct mtx *sema_mtxp;
1117 sbintime_t sbt, precision;
1120 int do_wakeup, do_undos;
1126 DPRINTF(("call to semop(%d, %p, %u)\n", usemid, usops, nsops));
1128 AUDIT_ARG_SVIPC_ID(usemid);
1130 rpr = sem_find_prison(td->td_ucred);
1134 semid = IPCID_TO_IX(usemid); /* Convert back to zero origin */
1136 if (semid < 0 || semid >= seminfo.semmni)
1138 if (timeout != NULL) {
1139 if (!timespecvalid_interval(timeout))
1142 if (timespecisset(timeout)) {
1143 if (timeout->tv_sec < INT32_MAX / 2) {
1144 precision = tstosbt(*timeout);
1145 if (TIMESEL(&sbt, precision))
1148 precision >>= tc_precexp;
1154 precision = sbt = 0;
1156 /* Allocate memory for sem_ops */
1157 if (nsops <= SMALL_SOPS)
1159 else if (nsops > seminfo.semopm) {
1160 DPRINTF(("too many sops (max=%d, nsops=%d)\n", seminfo.semopm,
1166 PROC_LOCK(td->td_proc);
1168 racct_get_available(td->td_proc, RACCT_NSEMOP)) {
1169 PROC_UNLOCK(td->td_proc);
1172 PROC_UNLOCK(td->td_proc);
1176 sops = malloc(nsops * sizeof(*sops), M_TEMP, M_WAITOK);
1178 if ((error = copyin(usops, sops, nsops * sizeof(sops[0]))) != 0) {
1179 DPRINTF(("error = %d from copyin(%p, %p, %d)\n", error,
1180 usops, sops, nsops * sizeof(sops[0])));
1181 if (sops != small_sops)
1186 semakptr = &sema[semid];
1187 sema_mtxp = &sema_mtx[semid];
1188 mtx_lock(sema_mtxp);
1189 if ((semakptr->u.sem_perm.mode & SEM_ALLOC) == 0) {
1193 seq = semakptr->u.sem_perm.seq;
1194 if (seq != IPCID_TO_SEQ(usemid)) {
1198 if ((error = sem_prison_cansee(rpr, semakptr)) != 0)
1201 * Initial pass through sops to see what permissions are needed.
1202 * Also perform any checks that don't need repeating on each
1203 * attempt to satisfy the request vector.
1205 j = 0; /* permission needed */
1207 for (i = 0; i < nsops; i++) {
1209 if (sopptr->sem_num >= semakptr->u.sem_nsems) {
1213 if (sopptr->sem_flg & SEM_UNDO && sopptr->sem_op != 0)
1215 j |= (sopptr->sem_op == 0) ? SEM_R : SEM_A;
1218 if ((error = ipcperm(td, &semakptr->u.sem_perm, j))) {
1219 DPRINTF(("error = %d from ipaccess\n", error));
1223 error = mac_sysvsem_check_semop(td->td_ucred, semakptr, j);
1229 * Loop trying to satisfy the vector of requests.
1230 * If we reach a point where we must wait, any requests already
1231 * performed are rolled back and we go to sleep until some other
1232 * process wakes us up. At this point, we start all over again.
1234 * This ensures that from the perspective of other tasks, a set
1235 * of requests is atomic (never partially satisfied).
1239 error = 0; /* error return if necessary */
1241 for (i = 0; i < nsops; i++) {
1243 semptr = &semakptr->u.__sem_base[sopptr->sem_num];
1246 "semop: semakptr=%p, __sem_base=%p, "
1247 "semptr=%p, sem[%d]=%d : op=%d, flag=%s\n",
1248 semakptr, semakptr->u.__sem_base, semptr,
1249 sopptr->sem_num, semptr->semval, sopptr->sem_op,
1250 (sopptr->sem_flg & IPC_NOWAIT) ?
1251 "nowait" : "wait"));
1253 if (sopptr->sem_op < 0) {
1254 if (semptr->semval + sopptr->sem_op < 0) {
1255 DPRINTF(("semop: can't do it now\n"));
1258 semptr->semval += sopptr->sem_op;
1259 if (semptr->semval == 0 &&
1260 semptr->semzcnt > 0)
1263 } else if (sopptr->sem_op == 0) {
1264 if (semptr->semval != 0) {
1265 DPRINTF(("semop: not zero now\n"));
1268 } else if (semptr->semval + sopptr->sem_op >
1273 if (semptr->semncnt > 0)
1275 semptr->semval += sopptr->sem_op;
1280 * Did we get through the entire vector?
1286 * No ... rollback anything that we've already done
1288 DPRINTF(("semop: rollback 0 through %d\n", i-1));
1289 for (j = 0; j < i; j++)
1290 semakptr->u.__sem_base[sops[j].sem_num].semval -=
1293 /* If we detected an error, return it */
1298 * If the request that we couldn't satisfy has the
1299 * NOWAIT flag set then return with EAGAIN.
1301 if (sopptr->sem_flg & IPC_NOWAIT) {
1306 if (sopptr->sem_op == 0)
1311 DPRINTF(("semop: good night!\n"));
1312 error = msleep_sbt(semakptr, sema_mtxp, (PZERO - 4) | PCATCH,
1313 "semwait", sbt, precision, C_ABSOLUTE);
1314 DPRINTF(("semop: good morning (error=%d)!\n", error));
1315 /* return code is checked below, after sem[nz]cnt-- */
1318 * Make sure that the semaphore still exists
1320 seq = semakptr->u.sem_perm.seq;
1321 if ((semakptr->u.sem_perm.mode & SEM_ALLOC) == 0 ||
1322 seq != IPCID_TO_SEQ(usemid)) {
1328 * Renew the semaphore's pointer after wakeup since
1329 * during msleep __sem_base may have been modified and semptr
1330 * is not valid any more
1332 semptr = &semakptr->u.__sem_base[sopptr->sem_num];
1335 * The semaphore is still alive. Readjust the count of
1336 * waiting processes.
1338 if (sopptr->sem_op == 0)
1344 * Is it really morning, or was our sleep interrupted?
1345 * (Delayed check of msleep() return code because we
1346 * need to decrement sem[nz]cnt either way.)
1349 if (error == ERESTART)
1353 DPRINTF(("semop: good morning!\n"));
1358 * Process any SEM_UNDO requests.
1363 for (i = 0; i < nsops; i++) {
1365 * We only need to deal with SEM_UNDO's for non-zero
1370 if ((sops[i].sem_flg & SEM_UNDO) == 0)
1372 adjval = sops[i].sem_op;
1375 error = semundo_adjust(td, &suptr, semid, seq,
1376 sops[i].sem_num, -adjval);
1381 * Oh-Oh! We ran out of either sem_undo's or undo's.
1382 * Rollback the adjustments to this point and then
1383 * rollback the semaphore ups and down so we can return
1384 * with an error with all structures restored. We
1385 * rollback the undo's in the exact reverse order that
1386 * we applied them. This guarantees that we won't run
1387 * out of space as we roll things back out.
1389 for (j = 0; j < i; j++) {
1391 if ((sops[k].sem_flg & SEM_UNDO) == 0)
1393 adjval = sops[k].sem_op;
1396 if (semundo_adjust(td, &suptr, semid, seq,
1397 sops[k].sem_num, adjval) != 0)
1398 panic("semop - can't undo undos");
1401 for (j = 0; j < nsops; j++)
1402 semakptr->u.__sem_base[sops[j].sem_num].semval -=
1405 DPRINTF(("error = %d from semundo_adjust\n", error));
1408 } /* loop through the sops */
1410 } /* if (do_undos) */
1412 /* We're definitely done - set the sempid's and time */
1413 for (i = 0; i < nsops; i++) {
1415 semptr = &semakptr->u.__sem_base[sopptr->sem_num];
1416 semptr->sempid = td->td_proc->p_pid;
1418 semakptr->u.sem_otime = time_second;
1421 * Do a wakeup if any semaphore was up'd whilst something was
1425 DPRINTF(("semop: doing wakeup\n"));
1427 DPRINTF(("semop: back from wakeup\n"));
1429 DPRINTF(("semop: done\n"));
1430 td->td_retval[0] = 0;
1432 mtx_unlock(sema_mtxp);
1433 if (sops != small_sops)
1439 * Go through the undo structures for this process and apply the adjustments to
1443 semexit_myhook(void *arg, struct proc *p)
1445 struct sem_undo *suptr;
1446 struct semid_kernel *semakptr;
1447 struct mtx *sema_mtxp;
1448 int semid, semnum, adjval, ix;
1452 * Go through the chain of undo vectors looking for one
1453 * associated with this process.
1455 if (LIST_EMPTY(&semu_list))
1458 LIST_FOREACH(suptr, &semu_list, un_next) {
1459 if (suptr->un_proc == p)
1462 if (suptr == NULL) {
1466 LIST_REMOVE(suptr, un_next);
1468 DPRINTF(("proc @%p has undo structure with %d entries\n", p,
1472 * If there are any active undo elements then process them.
1474 if (suptr->un_cnt > 0) {
1476 for (ix = 0; ix < suptr->un_cnt; ix++) {
1477 semid = suptr->un_ent[ix].un_id;
1478 semnum = suptr->un_ent[ix].un_num;
1479 adjval = suptr->un_ent[ix].un_adjval;
1480 seq = suptr->un_ent[ix].un_seq;
1481 semakptr = &sema[semid];
1482 sema_mtxp = &sema_mtx[semid];
1484 mtx_lock(sema_mtxp);
1485 if ((semakptr->u.sem_perm.mode & SEM_ALLOC) == 0 ||
1486 (semakptr->u.sem_perm.seq != seq)) {
1487 mtx_unlock(sema_mtxp);
1490 if (semnum >= semakptr->u.sem_nsems)
1491 panic("semexit - semnum out of range");
1494 "semexit: %p id=%d num=%d(adj=%d) ; sem=%d\n",
1495 suptr->un_proc, suptr->un_ent[ix].un_id,
1496 suptr->un_ent[ix].un_num,
1497 suptr->un_ent[ix].un_adjval,
1498 semakptr->u.__sem_base[semnum].semval));
1500 if (adjval < 0 && semakptr->u.__sem_base[semnum].semval <
1502 semakptr->u.__sem_base[semnum].semval = 0;
1504 semakptr->u.__sem_base[semnum].semval += adjval;
1507 DPRINTF(("semexit: back from wakeup\n"));
1508 mtx_unlock(sema_mtxp);
1514 * Deallocate the undo vector.
1516 DPRINTF(("removing vector\n"));
1517 suptr->un_proc = NULL;
1519 LIST_INSERT_HEAD(&semu_free_list, suptr, un_next);
1524 sysctl_sema(SYSCTL_HANDLER_ARGS)
1526 struct prison *pr, *rpr;
1527 struct semid_kernel tsemak;
1528 #ifdef COMPAT_FREEBSD32
1529 struct semid_kernel32 tsemak32;
1535 pr = req->td->td_ucred->cr_prison;
1536 rpr = sem_find_prison(req->td->td_ucred);
1538 for (i = 0; i < seminfo.semmni; i++) {
1539 mtx_lock(&sema_mtx[i]);
1540 if ((sema[i].u.sem_perm.mode & SEM_ALLOC) == 0 ||
1541 rpr == NULL || sem_prison_cansee(rpr, &sema[i]) != 0)
1542 bzero(&tsemak, sizeof(tsemak));
1545 if (tsemak.cred->cr_prison != pr)
1546 tsemak.u.sem_perm.key = IPC_PRIVATE;
1548 mtx_unlock(&sema_mtx[i]);
1549 #ifdef COMPAT_FREEBSD32
1550 if (SV_CURPROC_FLAG(SV_ILP32)) {
1551 bzero(&tsemak32, sizeof(tsemak32));
1552 freebsd32_ipcperm_out(&tsemak.u.sem_perm,
1553 &tsemak32.u.sem_perm);
1554 /* Don't copy u.__sem_base */
1555 CP(tsemak, tsemak32, u.sem_nsems);
1556 CP(tsemak, tsemak32, u.sem_otime);
1557 CP(tsemak, tsemak32, u.sem_ctime);
1558 /* Don't copy label or cred */
1559 outaddr = &tsemak32;
1560 outsize = sizeof(tsemak32);
1564 tsemak.u.__sem_base = NULL;
1565 tsemak.label = NULL;
1568 outsize = sizeof(tsemak);
1570 error = SYSCTL_OUT(req, outaddr, outsize);
1578 sem_prison_check(void *obj, void *data)
1580 struct prison *pr = obj;
1581 struct prison *prpr;
1582 struct vfsoptlist *opts = data;
1586 * sysvsem is a jailsys integer.
1587 * It must be "disable" if the parent jail is disabled.
1589 error = vfs_copyopt(opts, "sysvsem", &jsys, sizeof(jsys));
1590 if (error != ENOENT) {
1594 case JAIL_SYS_DISABLE:
1597 case JAIL_SYS_INHERIT:
1598 prison_lock(pr->pr_parent);
1599 prpr = osd_jail_get(pr->pr_parent, sem_prison_slot);
1600 prison_unlock(pr->pr_parent);
1613 sem_prison_set(void *obj, void *data)
1615 struct prison *pr = obj;
1616 struct prison *tpr, *orpr, *nrpr, *trpr;
1617 struct vfsoptlist *opts = data;
1622 * sysvsem controls which jail is the root of the associated sems (this
1623 * jail or same as the parent), or if the feature is available at all.
1625 if (vfs_copyopt(opts, "sysvsem", &jsys, sizeof(jsys)) == ENOENT)
1626 jsys = vfs_flagopt(opts, "allow.sysvipc", NULL, 0)
1628 : vfs_flagopt(opts, "allow.nosysvipc", NULL, 0)
1631 if (jsys == JAIL_SYS_DISABLE) {
1633 orpr = osd_jail_get(pr, sem_prison_slot);
1635 osd_jail_del(pr, sem_prison_slot);
1639 sem_prison_cleanup(pr);
1640 /* Disable all child jails as well. */
1641 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1643 trpr = osd_jail_get(tpr, sem_prison_slot);
1645 osd_jail_del(tpr, sem_prison_slot);
1648 sem_prison_cleanup(tpr);
1655 } else if (jsys != -1) {
1656 if (jsys == JAIL_SYS_NEW)
1659 prison_lock(pr->pr_parent);
1660 nrpr = osd_jail_get(pr->pr_parent, sem_prison_slot);
1661 prison_unlock(pr->pr_parent);
1663 rsv = osd_reserve(sem_prison_slot);
1665 orpr = osd_jail_get(pr, sem_prison_slot);
1667 (void)osd_jail_set_reserved(pr, sem_prison_slot, rsv,
1670 osd_free_reserved(rsv);
1674 sem_prison_cleanup(pr);
1676 /* Change child jails matching the old root, */
1677 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1679 trpr = osd_jail_get(tpr,
1682 (void)osd_jail_set(tpr,
1683 sem_prison_slot, nrpr);
1686 sem_prison_cleanup(tpr);
1700 sem_prison_get(void *obj, void *data)
1702 struct prison *pr = obj;
1704 struct vfsoptlist *opts = data;
1707 /* Set sysvsem based on the jail's root prison. */
1709 rpr = osd_jail_get(pr, sem_prison_slot);
1711 jsys = rpr == NULL ? JAIL_SYS_DISABLE
1712 : rpr == pr ? JAIL_SYS_NEW : JAIL_SYS_INHERIT;
1713 error = vfs_setopt(opts, "sysvsem", &jsys, sizeof(jsys));
1714 if (error == ENOENT)
1720 sem_prison_remove(void *obj, void *data __unused)
1722 struct prison *pr = obj;
1726 rpr = osd_jail_get(pr, sem_prison_slot);
1729 sem_prison_cleanup(pr);
1734 sem_prison_cleanup(struct prison *pr)
1738 /* Remove any sems that belong to this jail. */
1740 for (i = 0; i < seminfo.semmni; i++) {
1741 if ((sema[i].u.sem_perm.mode & SEM_ALLOC) &&
1742 sema[i].cred != NULL && sema[i].cred->cr_prison == pr) {
1743 mtx_lock(&sema_mtx[i]);
1744 sem_remove(i, NULL);
1745 mtx_unlock(&sema_mtx[i]);
1748 mtx_unlock(&sem_mtx);
1751 SYSCTL_JAIL_PARAM_SYS_NODE(sysvsem, CTLFLAG_RW, "SYSV semaphores");
1753 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1754 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1756 /* XXX casting to (sy_call_t *) is bogus, as usual. */
1757 static sy_call_t *semcalls[] = {
1758 (sy_call_t *)freebsd7___semctl, (sy_call_t *)sys_semget,
1759 (sy_call_t *)sys_semop
1763 * Entry point for all SEM calls.
1766 sys_semsys(struct thread *td, struct semsys_args *uap)
1770 AUDIT_ARG_SVIPC_WHICH(uap->which);
1771 if (uap->which < 0 || uap->which >= nitems(semcalls))
1773 error = (*semcalls[uap->which])(td, &uap->a2);
1777 #ifndef _SYS_SYSPROTO_H_
1778 struct freebsd7___semctl_args {
1782 union semun_old *arg;
1786 freebsd7___semctl(struct thread *td, struct freebsd7___semctl_args *uap)
1788 struct semid_ds_old dsold;
1789 struct semid_ds dsbuf;
1790 union semun_old arg;
1802 error = copyin(uap->arg, &arg, sizeof(arg));
1814 error = copyin(arg.buf, &dsold, sizeof(dsold));
1817 ipcperm_old2new(&dsold.sem_perm, &dsbuf.sem_perm);
1818 CP(dsold, dsbuf, __sem_base);
1819 CP(dsold, dsbuf, sem_nsems);
1820 CP(dsold, dsbuf, sem_otime);
1821 CP(dsold, dsbuf, sem_ctime);
1826 semun.array = arg.array;
1829 semun.val = arg.val;
1833 error = kern_semctl(td, uap->semid, uap->semnum, uap->cmd, &semun,
1841 bzero(&dsold, sizeof(dsold));
1842 ipcperm_new2old(&dsbuf.sem_perm, &dsold.sem_perm);
1843 CP(dsbuf, dsold, __sem_base);
1844 CP(dsbuf, dsold, sem_nsems);
1845 CP(dsbuf, dsold, sem_otime);
1846 CP(dsbuf, dsold, sem_ctime);
1847 error = copyout(&dsold, arg.buf, sizeof(dsold));
1852 td->td_retval[0] = rval;
1856 #endif /* COMPAT_FREEBSD{4,5,6,7} */
1858 #ifdef COMPAT_FREEBSD32
1861 freebsd32_semsys(struct thread *td, struct freebsd32_semsys_args *uap)
1864 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1865 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1866 AUDIT_ARG_SVIPC_WHICH(uap->which);
1867 switch (uap->which) {
1869 return (freebsd7_freebsd32_semctl(td,
1870 (struct freebsd7_freebsd32_semctl_args *)&uap->a2));
1872 return (sys_semsys(td, (struct semsys_args *)uap));
1875 return (nosys(td, NULL));
1879 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1880 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1882 freebsd7_freebsd32_semctl(struct thread *td,
1883 struct freebsd7_freebsd32_semctl_args *uap)
1885 struct semid_ds32_old dsbuf32;
1886 struct semid_ds dsbuf;
1899 error = copyin(uap->arg, &arg, sizeof(arg));
1911 error = copyin(PTRIN(arg.buf), &dsbuf32, sizeof(dsbuf32));
1914 freebsd32_ipcperm_old_in(&dsbuf32.sem_perm, &dsbuf.sem_perm);
1915 PTRIN_CP(dsbuf32, dsbuf, __sem_base);
1916 CP(dsbuf32, dsbuf, sem_nsems);
1917 CP(dsbuf32, dsbuf, sem_otime);
1918 CP(dsbuf32, dsbuf, sem_ctime);
1923 semun.array = PTRIN(arg.array);
1926 semun.val = arg.val;
1930 error = kern_semctl(td, uap->semid, uap->semnum, uap->cmd, &semun,
1938 bzero(&dsbuf32, sizeof(dsbuf32));
1939 freebsd32_ipcperm_old_out(&dsbuf.sem_perm, &dsbuf32.sem_perm);
1940 PTROUT_CP(dsbuf, dsbuf32, __sem_base);
1941 CP(dsbuf, dsbuf32, sem_nsems);
1942 CP(dsbuf, dsbuf32, sem_otime);
1943 CP(dsbuf, dsbuf32, sem_ctime);
1944 error = copyout(&dsbuf32, PTRIN(arg.buf), sizeof(dsbuf32));
1949 td->td_retval[0] = rval;
1955 freebsd32_semctl(struct thread *td, struct freebsd32_semctl_args *uap)
1957 struct semid_ds32 dsbuf32;
1958 struct semid_ds dsbuf;
1971 error = copyin(uap->arg, &arg, sizeof(arg));
1983 error = copyin(PTRIN(arg.buf), &dsbuf32, sizeof(dsbuf32));
1986 freebsd32_ipcperm_in(&dsbuf32.sem_perm, &dsbuf.sem_perm);
1987 PTRIN_CP(dsbuf32, dsbuf, __sem_base);
1988 CP(dsbuf32, dsbuf, sem_nsems);
1989 CP(dsbuf32, dsbuf, sem_otime);
1990 CP(dsbuf32, dsbuf, sem_ctime);
1995 semun.array = PTRIN(arg.array);
1998 semun.val = arg.val;
2002 error = kern_semctl(td, uap->semid, uap->semnum, uap->cmd, &semun,
2010 bzero(&dsbuf32, sizeof(dsbuf32));
2011 freebsd32_ipcperm_out(&dsbuf.sem_perm, &dsbuf32.sem_perm);
2012 PTROUT_CP(dsbuf, dsbuf32, __sem_base);
2013 CP(dsbuf, dsbuf32, sem_nsems);
2014 CP(dsbuf, dsbuf32, sem_otime);
2015 CP(dsbuf, dsbuf32, sem_ctime);
2016 error = copyout(&dsbuf32, PTRIN(arg.buf), sizeof(dsbuf32));
2021 td->td_retval[0] = rval;
2025 #endif /* COMPAT_FREEBSD32 */