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-FreeBSD
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 __FBSDID("$FreeBSD$");
50 #include "opt_sysvipc.h"
52 #include <sys/param.h>
53 #include <sys/systm.h>
54 #include <sys/sysproto.h>
55 #include <sys/eventhandler.h>
56 #include <sys/kernel.h>
59 #include <sys/module.h>
60 #include <sys/mutex.h>
61 #include <sys/racct.h>
64 #include <sys/syscall.h>
65 #include <sys/syscallsubr.h>
66 #include <sys/sysent.h>
67 #include <sys/sysctl.h>
69 #include <sys/malloc.h>
72 #include <security/audit/audit.h>
73 #include <security/mac/mac_framework.h>
75 FEATURE(sysv_sem, "System V semaphores support");
77 static MALLOC_DEFINE(M_SEM, "sem", "SVID compatible semaphores");
80 #define DPRINTF(a) printf a
85 static int seminit(void);
86 static int sysvsem_modload(struct module *, int, void *);
87 static int semunload(void);
88 static void semexit_myhook(void *arg, struct proc *p);
89 static int sysctl_sema(SYSCTL_HANDLER_ARGS);
90 static int semvalid(int semid, struct prison *rpr,
91 struct semid_kernel *semakptr);
92 static void sem_remove(int semidx, struct ucred *cred);
93 static struct prison *sem_find_prison(struct ucred *);
94 static int sem_prison_cansee(struct prison *, struct semid_kernel *);
95 static int sem_prison_check(void *, void *);
96 static int sem_prison_set(void *, void *);
97 static int sem_prison_get(void *, void *);
98 static int sem_prison_remove(void *, void *);
99 static void sem_prison_cleanup(struct prison *);
101 #ifndef _SYS_SYSPROTO_H_
102 struct __semctl_args;
103 int __semctl(struct thread *td, struct __semctl_args *uap);
105 int semget(struct thread *td, struct semget_args *uap);
107 int semop(struct thread *td, struct semop_args *uap);
110 static struct sem_undo *semu_alloc(struct thread *td);
111 static int semundo_adjust(struct thread *td, struct sem_undo **supptr,
112 int semid, int semseq, int semnum, int adjval);
113 static void semundo_clear(int semid, int semnum);
115 static struct mtx sem_mtx; /* semaphore global lock */
116 static struct mtx sem_undo_mtx;
117 static int semtot = 0;
118 static struct semid_kernel *sema; /* semaphore id pool */
119 static struct mtx *sema_mtx; /* semaphore id pool mutexes*/
120 static struct sem *sem; /* semaphore pool */
121 LIST_HEAD(, sem_undo) semu_list; /* list of active undo structures */
122 LIST_HEAD(, sem_undo) semu_free_list; /* list of free undo structures */
123 static int *semu; /* undo structure pool */
124 static eventhandler_tag semexit_tag;
125 static unsigned sem_prison_slot; /* prison OSD slot */
127 #define SEMUNDO_MTX sem_undo_mtx
128 #define SEMUNDO_LOCK() mtx_lock(&SEMUNDO_MTX);
129 #define SEMUNDO_UNLOCK() mtx_unlock(&SEMUNDO_MTX);
130 #define SEMUNDO_LOCKASSERT(how) mtx_assert(&SEMUNDO_MTX, (how));
133 u_short semval; /* semaphore value */
134 pid_t sempid; /* pid of last operation */
135 u_short semncnt; /* # awaiting semval > cval */
136 u_short semzcnt; /* # awaiting semval = 0 */
140 * Undo structure (one per process)
143 LIST_ENTRY(sem_undo) un_next; /* ptr to next active undo structure */
144 struct proc *un_proc; /* owner of this structure */
145 short un_cnt; /* # of active entries */
147 short un_adjval; /* adjust on exit values */
148 short un_num; /* semaphore # */
149 int un_id; /* semid */
150 unsigned short un_seq;
151 } un_ent[1]; /* undo entries */
155 * Configuration parameters
158 #define SEMMNI 50 /* # of semaphore identifiers */
161 #define SEMMNS 340 /* # of semaphores in system */
164 #define SEMUME 50 /* max # of undo entries per process */
167 #define SEMMNU 150 /* # of undo structures in system */
170 /* shouldn't need tuning */
172 #define SEMMSL SEMMNS /* max # of semaphores per id */
175 #define SEMOPM 100 /* max # of operations per semop call */
178 #define SEMVMX 32767 /* semaphore maximum value */
179 #define SEMAEM 16384 /* adjust on exit max value */
182 * Due to the way semaphore memory is allocated, we have to ensure that
183 * SEMUSZ is properly aligned.
186 #define SEM_ALIGN(bytes) roundup2(bytes, sizeof(long))
188 /* actual size of an undo structure */
189 #define SEMUSZ SEM_ALIGN(offsetof(struct sem_undo, un_ent[SEMUME]))
192 * Macro to find a particular sem_undo vector
195 ((struct sem_undo *)(((intptr_t)semu)+ix * seminfo.semusz))
198 * semaphore info struct
200 struct seminfo seminfo = {
201 .semmni = SEMMNI, /* # of semaphore identifiers */
202 .semmns = SEMMNS, /* # of semaphores in system */
203 .semmnu = SEMMNU, /* # of undo structures in system */
204 .semmsl = SEMMSL, /* max # of semaphores per id */
205 .semopm = SEMOPM, /* max # of operations per semop call */
206 .semume = SEMUME, /* max # of undo entries per process */
207 .semusz = SEMUSZ, /* size in bytes of undo structure */
208 .semvmx = SEMVMX, /* semaphore maximum value */
209 .semaem = SEMAEM, /* adjust on exit max value */
212 SYSCTL_INT(_kern_ipc, OID_AUTO, semmni, CTLFLAG_RDTUN, &seminfo.semmni, 0,
213 "Number of semaphore identifiers");
214 SYSCTL_INT(_kern_ipc, OID_AUTO, semmns, CTLFLAG_RDTUN, &seminfo.semmns, 0,
215 "Maximum number of semaphores in the system");
216 SYSCTL_INT(_kern_ipc, OID_AUTO, semmnu, CTLFLAG_RDTUN, &seminfo.semmnu, 0,
217 "Maximum number of undo structures in the system");
218 SYSCTL_INT(_kern_ipc, OID_AUTO, semmsl, CTLFLAG_RWTUN, &seminfo.semmsl, 0,
219 "Max semaphores per id");
220 SYSCTL_INT(_kern_ipc, OID_AUTO, semopm, CTLFLAG_RDTUN, &seminfo.semopm, 0,
221 "Max operations per semop call");
222 SYSCTL_INT(_kern_ipc, OID_AUTO, semume, CTLFLAG_RDTUN, &seminfo.semume, 0,
223 "Max undo entries per process");
224 SYSCTL_INT(_kern_ipc, OID_AUTO, semusz, CTLFLAG_RDTUN, &seminfo.semusz, 0,
225 "Size in bytes of undo structure");
226 SYSCTL_INT(_kern_ipc, OID_AUTO, semvmx, CTLFLAG_RWTUN, &seminfo.semvmx, 0,
227 "Semaphore maximum value");
228 SYSCTL_INT(_kern_ipc, OID_AUTO, semaem, CTLFLAG_RWTUN, &seminfo.semaem, 0,
229 "Adjust on exit max value");
230 SYSCTL_PROC(_kern_ipc, OID_AUTO, sema,
231 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE,
232 NULL, 0, sysctl_sema, "",
233 "Array of struct semid_kernel for each potential semaphore");
235 static struct syscall_helper_data sem_syscalls[] = {
236 SYSCALL_INIT_HELPER(__semctl),
237 SYSCALL_INIT_HELPER(semget),
238 SYSCALL_INIT_HELPER(semop),
239 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
240 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
241 SYSCALL_INIT_HELPER(semsys),
242 SYSCALL_INIT_HELPER_COMPAT(freebsd7___semctl),
247 #ifdef COMPAT_FREEBSD32
248 #include <compat/freebsd32/freebsd32.h>
249 #include <compat/freebsd32/freebsd32_ipc.h>
250 #include <compat/freebsd32/freebsd32_proto.h>
251 #include <compat/freebsd32/freebsd32_signal.h>
252 #include <compat/freebsd32/freebsd32_syscall.h>
253 #include <compat/freebsd32/freebsd32_util.h>
255 static struct syscall_helper_data sem32_syscalls[] = {
256 SYSCALL32_INIT_HELPER(freebsd32_semctl),
257 SYSCALL32_INIT_HELPER_COMPAT(semget),
258 SYSCALL32_INIT_HELPER_COMPAT(semop),
259 SYSCALL32_INIT_HELPER(freebsd32_semsys),
260 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
261 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
262 SYSCALL32_INIT_HELPER(freebsd7_freebsd32_semctl),
274 osd_method_t methods[PR_MAXMETHOD] = {
275 [PR_METHOD_CHECK] = sem_prison_check,
276 [PR_METHOD_SET] = sem_prison_set,
277 [PR_METHOD_GET] = sem_prison_get,
278 [PR_METHOD_REMOVE] = sem_prison_remove,
281 sem = malloc(sizeof(struct sem) * seminfo.semmns, M_SEM, M_WAITOK);
282 sema = malloc(sizeof(struct semid_kernel) * seminfo.semmni, M_SEM,
284 sema_mtx = malloc(sizeof(struct mtx) * seminfo.semmni, M_SEM,
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) && pr->pr_ref > 0) {
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)
398 static moduledata_t sysvsem_mod = {
404 DECLARE_MODULE(sysvsem, sysvsem_mod, SI_SUB_SYSV_SEM, SI_ORDER_FIRST);
405 MODULE_VERSION(sysvsem, 1);
408 * Allocate a new sem_undo structure for a process
409 * (returns ptr to structure or NULL if no more room)
412 static struct sem_undo *
413 semu_alloc(struct thread *td)
415 struct sem_undo *suptr;
417 SEMUNDO_LOCKASSERT(MA_OWNED);
418 if ((suptr = LIST_FIRST(&semu_free_list)) == NULL)
420 LIST_REMOVE(suptr, un_next);
421 LIST_INSERT_HEAD(&semu_list, suptr, un_next);
423 suptr->un_proc = td->td_proc;
428 semu_try_free(struct sem_undo *suptr)
431 SEMUNDO_LOCKASSERT(MA_OWNED);
433 if (suptr->un_cnt != 0)
435 LIST_REMOVE(suptr, un_next);
436 LIST_INSERT_HEAD(&semu_free_list, suptr, un_next);
441 * Adjust a particular entry for a particular proc
445 semundo_adjust(struct thread *td, struct sem_undo **supptr, int semid,
446 int semseq, int semnum, int adjval)
448 struct proc *p = td->td_proc;
449 struct sem_undo *suptr;
453 SEMUNDO_LOCKASSERT(MA_OWNED);
454 /* Look for and remember the sem_undo if the caller doesn't provide
459 LIST_FOREACH(suptr, &semu_list, un_next) {
460 if (suptr->un_proc == p) {
468 suptr = semu_alloc(td);
476 * Look for the requested entry and adjust it (delete if adjval becomes
479 sunptr = &suptr->un_ent[0];
480 for (i = 0; i < suptr->un_cnt; i++, sunptr++) {
481 if (sunptr->un_id != semid || sunptr->un_num != semnum)
484 adjval += sunptr->un_adjval;
485 if (adjval > seminfo.semaem || adjval < -seminfo.semaem)
488 sunptr->un_adjval = adjval;
489 if (sunptr->un_adjval == 0) {
491 if (i < suptr->un_cnt)
493 suptr->un_ent[suptr->un_cnt];
494 if (suptr->un_cnt == 0)
495 semu_try_free(suptr);
500 /* Didn't find the right entry - create it */
503 if (adjval > seminfo.semaem || adjval < -seminfo.semaem)
505 if (suptr->un_cnt != seminfo.semume) {
506 sunptr = &suptr->un_ent[suptr->un_cnt];
508 sunptr->un_adjval = adjval;
509 sunptr->un_id = semid;
510 sunptr->un_num = semnum;
511 sunptr->un_seq = semseq;
518 semundo_clear(int semid, int semnum)
520 struct sem_undo *suptr, *suptr1;
524 SEMUNDO_LOCKASSERT(MA_OWNED);
525 LIST_FOREACH_SAFE(suptr, &semu_list, un_next, suptr1) {
526 sunptr = &suptr->un_ent[0];
527 for (i = 0; i < suptr->un_cnt; i++, sunptr++) {
528 if (sunptr->un_id != semid)
530 if (semnum == -1 || sunptr->un_num == semnum) {
532 if (i < suptr->un_cnt) {
534 suptr->un_ent[suptr->un_cnt];
537 semu_try_free(suptr);
546 semvalid(int semid, struct prison *rpr, struct semid_kernel *semakptr)
549 return ((semakptr->u.sem_perm.mode & SEM_ALLOC) == 0 ||
550 semakptr->u.sem_perm.seq != IPCID_TO_SEQ(semid) ||
551 sem_prison_cansee(rpr, semakptr) ? EINVAL : 0);
555 sem_remove(int semidx, struct ucred *cred)
557 struct semid_kernel *semakptr;
560 KASSERT(semidx >= 0 && semidx < seminfo.semmni,
561 ("semidx out of bounds"));
562 mtx_assert(&sem_mtx, MA_OWNED);
563 semakptr = &sema[semidx];
564 KASSERT(semakptr->u.__sem_base - sem + semakptr->u.sem_nsems <= semtot,
565 ("sem_remove: sema %d corrupted sem pointer %p %p %d %d",
566 semidx, semakptr->u.__sem_base, sem, semakptr->u.sem_nsems,
569 semakptr->u.sem_perm.cuid = cred ? cred->cr_uid : 0;
570 semakptr->u.sem_perm.uid = cred ? cred->cr_uid : 0;
571 semakptr->u.sem_perm.mode = 0;
572 racct_sub_cred(semakptr->cred, RACCT_NSEM, semakptr->u.sem_nsems);
573 crfree(semakptr->cred);
574 semakptr->cred = NULL;
576 semundo_clear(semidx, -1);
579 mac_sysvsem_cleanup(semakptr);
582 for (i = 0; i < seminfo.semmni; i++) {
583 if ((sema[i].u.sem_perm.mode & SEM_ALLOC) &&
584 sema[i].u.__sem_base > semakptr->u.__sem_base)
585 mtx_lock_flags(&sema_mtx[i], LOP_DUPOK);
587 for (i = semakptr->u.__sem_base - sem + semakptr->u.sem_nsems;
589 sem[i - semakptr->u.sem_nsems] = sem[i];
590 for (i = 0; i < seminfo.semmni; i++) {
591 if ((sema[i].u.sem_perm.mode & SEM_ALLOC) &&
592 sema[i].u.__sem_base > semakptr->u.__sem_base) {
593 sema[i].u.__sem_base -= semakptr->u.sem_nsems;
594 mtx_unlock(&sema_mtx[i]);
597 semtot -= semakptr->u.sem_nsems;
600 static struct prison *
601 sem_find_prison(struct ucred *cred)
603 struct prison *pr, *rpr;
605 pr = cred->cr_prison;
607 rpr = osd_jail_get(pr, sem_prison_slot);
613 sem_prison_cansee(struct prison *rpr, struct semid_kernel *semakptr)
616 if (semakptr->cred == NULL ||
617 !(rpr == semakptr->cred->cr_prison ||
618 prison_ischild(rpr, semakptr->cred->cr_prison)))
624 * Note that the user-mode half of this passes a union, not a pointer.
626 #ifndef _SYS_SYSPROTO_H_
627 struct __semctl_args {
635 sys___semctl(struct thread *td, struct __semctl_args *uap)
637 struct semid_ds dsbuf;
638 union semun arg, semun;
649 error = copyin(uap->arg, &arg, sizeof(arg));
661 error = copyin(arg.buf, &dsbuf, sizeof(dsbuf));
668 semun.array = arg.array;
675 error = kern_semctl(td, uap->semid, uap->semnum, uap->cmd, &semun,
683 error = copyout(&dsbuf, arg.buf, sizeof(dsbuf));
688 td->td_retval[0] = rval;
693 kern_semctl(struct thread *td, int semid, int semnum, int cmd,
694 union semun *arg, register_t *rval)
697 struct ucred *cred = td->td_ucred;
700 struct semid_ds *sbuf;
701 struct semid_kernel *semakptr;
702 struct mtx *sema_mtxp;
703 u_short usval, count;
706 DPRINTF(("call to semctl(%d, %d, %d, 0x%p)\n",
707 semid, semnum, cmd, arg));
709 AUDIT_ARG_SVIPC_CMD(cmd);
710 AUDIT_ARG_SVIPC_ID(semid);
712 rpr = sem_find_prison(td->td_ucred);
721 * For this command we assume semid is an array index
722 * rather than an IPC id.
724 if (semid < 0 || semid >= seminfo.semmni)
726 semakptr = &sema[semid];
727 sema_mtxp = &sema_mtx[semid];
729 if ((semakptr->u.sem_perm.mode & SEM_ALLOC) == 0) {
733 if ((error = sem_prison_cansee(rpr, semakptr)))
735 if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_R)))
738 error = mac_sysvsem_check_semctl(cred, semakptr, cmd);
742 bcopy(&semakptr->u, arg->buf, sizeof(struct semid_ds));
743 if (cred->cr_prison != semakptr->cred->cr_prison)
744 arg->buf->sem_perm.key = IPC_PRIVATE;
745 *rval = IXSEQ_TO_IPCID(semid, semakptr->u.sem_perm);
746 mtx_unlock(sema_mtxp);
750 semidx = IPCID_TO_IX(semid);
751 if (semidx < 0 || semidx >= seminfo.semmni)
754 semakptr = &sema[semidx];
755 sema_mtxp = &sema_mtx[semidx];
761 error = mac_sysvsem_check_semctl(cred, semakptr, cmd);
771 if ((error = semvalid(semid, rpr, semakptr)) != 0)
773 if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_M)))
775 sem_remove(semidx, cred);
779 AUDIT_ARG_SVIPC_PERM(&arg->buf->sem_perm);
780 if ((error = semvalid(semid, rpr, semakptr)) != 0)
782 if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_M)))
785 semakptr->u.sem_perm.uid = sbuf->sem_perm.uid;
786 semakptr->u.sem_perm.gid = sbuf->sem_perm.gid;
787 semakptr->u.sem_perm.mode = (semakptr->u.sem_perm.mode &
788 ~0777) | (sbuf->sem_perm.mode & 0777);
789 semakptr->u.sem_ctime = time_second;
793 if ((error = semvalid(semid, rpr, semakptr)) != 0)
795 if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_R)))
797 bcopy(&semakptr->u, arg->buf, sizeof(struct semid_ds));
798 if (cred->cr_prison != semakptr->cred->cr_prison)
799 arg->buf->sem_perm.key = IPC_PRIVATE;
803 if ((error = semvalid(semid, rpr, semakptr)) != 0)
805 if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_R)))
807 if (semnum < 0 || semnum >= semakptr->u.sem_nsems) {
811 *rval = semakptr->u.__sem_base[semnum].semncnt;
815 if ((error = semvalid(semid, rpr, semakptr)) != 0)
817 if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_R)))
819 if (semnum < 0 || semnum >= semakptr->u.sem_nsems) {
823 *rval = semakptr->u.__sem_base[semnum].sempid;
827 if ((error = semvalid(semid, rpr, semakptr)) != 0)
829 if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_R)))
831 if (semnum < 0 || semnum >= semakptr->u.sem_nsems) {
835 *rval = semakptr->u.__sem_base[semnum].semval;
840 * Unfortunately, callers of this function don't know
841 * in advance how many semaphores are in this set.
842 * While we could just allocate the maximum size array
843 * and pass the actual size back to the caller, that
844 * won't work for SETALL since we can't copyin() more
845 * data than the user specified as we may return a
848 * Note that the number of semaphores in a set is
849 * fixed for the life of that set. The only way that
850 * the 'count' could change while are blocked in
851 * malloc() is if this semaphore set were destroyed
852 * and a new one created with the same index.
853 * However, semvalid() will catch that due to the
854 * sequence number unless exactly 0x8000 (or a
855 * multiple thereof) semaphore sets for the same index
856 * are created and destroyed while we are in malloc!
859 count = semakptr->u.sem_nsems;
860 mtx_unlock(sema_mtxp);
861 array = malloc(sizeof(*array) * count, M_TEMP, M_WAITOK);
863 if ((error = semvalid(semid, rpr, semakptr)) != 0)
865 KASSERT(count == semakptr->u.sem_nsems, ("nsems changed"));
866 if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_R)))
868 for (i = 0; i < semakptr->u.sem_nsems; i++)
869 array[i] = semakptr->u.__sem_base[i].semval;
870 mtx_unlock(sema_mtxp);
871 error = copyout(array, arg->array, count * sizeof(*array));
876 if ((error = semvalid(semid, rpr, semakptr)) != 0)
878 if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_R)))
880 if (semnum < 0 || semnum >= semakptr->u.sem_nsems) {
884 *rval = semakptr->u.__sem_base[semnum].semzcnt;
888 if ((error = semvalid(semid, rpr, semakptr)) != 0)
890 if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_W)))
892 if (semnum < 0 || semnum >= semakptr->u.sem_nsems) {
896 if (arg->val < 0 || arg->val > seminfo.semvmx) {
900 semakptr->u.__sem_base[semnum].semval = arg->val;
902 semundo_clear(semidx, semnum);
909 * See comment on GETALL for why 'count' shouldn't change
910 * and why we require a userland buffer.
912 count = semakptr->u.sem_nsems;
913 mtx_unlock(sema_mtxp);
914 array = malloc(sizeof(*array) * count, M_TEMP, M_WAITOK);
915 error = copyin(arg->array, array, count * sizeof(*array));
919 if ((error = semvalid(semid, rpr, semakptr)) != 0)
921 KASSERT(count == semakptr->u.sem_nsems, ("nsems changed"));
922 if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_W)))
924 for (i = 0; i < semakptr->u.sem_nsems; i++) {
926 if (usval > seminfo.semvmx) {
930 semakptr->u.__sem_base[i].semval = usval;
933 semundo_clear(semidx, -1);
944 mtx_unlock(sema_mtxp);
946 mtx_unlock(&sem_mtx);
952 #ifndef _SYS_SYSPROTO_H_
960 sys_semget(struct thread *td, struct semget_args *uap)
962 int semid, error = 0;
964 int nsems = uap->nsems;
965 int semflg = uap->semflg;
966 struct ucred *cred = td->td_ucred;
968 DPRINTF(("semget(0x%x, %d, 0%o)\n", key, nsems, semflg));
970 AUDIT_ARG_VALUE(semflg);
972 if (sem_find_prison(cred) == NULL)
976 if (key != IPC_PRIVATE) {
977 for (semid = 0; semid < seminfo.semmni; semid++) {
978 if ((sema[semid].u.sem_perm.mode & SEM_ALLOC) &&
979 sema[semid].cred != NULL &&
980 sema[semid].cred->cr_prison == cred->cr_prison &&
981 sema[semid].u.sem_perm.key == key)
984 if (semid < seminfo.semmni) {
985 AUDIT_ARG_SVIPC_ID(semid);
986 DPRINTF(("found public key\n"));
987 if ((semflg & IPC_CREAT) && (semflg & IPC_EXCL)) {
988 DPRINTF(("not exclusive\n"));
992 if ((error = ipcperm(td, &sema[semid].u.sem_perm,
996 if (nsems > 0 && sema[semid].u.sem_nsems < nsems) {
997 DPRINTF(("too small\n"));
1002 error = mac_sysvsem_check_semget(cred, &sema[semid]);
1010 DPRINTF(("need to allocate the semid_kernel\n"));
1011 if (key == IPC_PRIVATE || (semflg & IPC_CREAT)) {
1012 if (nsems <= 0 || nsems > seminfo.semmsl) {
1013 DPRINTF(("nsems out of range (0<%d<=%d)\n", nsems,
1018 if (nsems > seminfo.semmns - semtot) {
1020 "not enough semaphores left (need %d, got %d)\n",
1021 nsems, seminfo.semmns - semtot));
1025 for (semid = 0; semid < seminfo.semmni; semid++) {
1026 if ((sema[semid].u.sem_perm.mode & SEM_ALLOC) == 0)
1029 if (semid == seminfo.semmni) {
1030 DPRINTF(("no more semid_kernel's available\n"));
1036 PROC_LOCK(td->td_proc);
1037 error = racct_add(td->td_proc, RACCT_NSEM, nsems);
1038 PROC_UNLOCK(td->td_proc);
1045 DPRINTF(("semid %d is available\n", semid));
1046 mtx_lock(&sema_mtx[semid]);
1047 KASSERT((sema[semid].u.sem_perm.mode & SEM_ALLOC) == 0,
1048 ("Lost semaphore %d", semid));
1049 sema[semid].u.sem_perm.key = key;
1050 sema[semid].u.sem_perm.cuid = cred->cr_uid;
1051 sema[semid].u.sem_perm.uid = cred->cr_uid;
1052 sema[semid].u.sem_perm.cgid = cred->cr_gid;
1053 sema[semid].u.sem_perm.gid = cred->cr_gid;
1054 sema[semid].u.sem_perm.mode = (semflg & 0777) | SEM_ALLOC;
1055 sema[semid].cred = crhold(cred);
1056 sema[semid].u.sem_perm.seq =
1057 (sema[semid].u.sem_perm.seq + 1) & 0x7fff;
1058 sema[semid].u.sem_nsems = nsems;
1059 sema[semid].u.sem_otime = 0;
1060 sema[semid].u.sem_ctime = time_second;
1061 sema[semid].u.__sem_base = &sem[semtot];
1063 bzero(sema[semid].u.__sem_base,
1064 sizeof(sema[semid].u.__sem_base[0])*nsems);
1066 mac_sysvsem_create(cred, &sema[semid]);
1068 mtx_unlock(&sema_mtx[semid]);
1069 DPRINTF(("sembase = %p, next = %p\n",
1070 sema[semid].u.__sem_base, &sem[semtot]));
1072 DPRINTF(("didn't find it and wasn't asked to create it\n"));
1078 td->td_retval[0] = IXSEQ_TO_IPCID(semid, sema[semid].u.sem_perm);
1080 mtx_unlock(&sem_mtx);
1084 #ifndef _SYS_SYSPROTO_H_
1087 struct sembuf *sops;
1092 sys_semop(struct thread *td, struct semop_args *uap)
1094 #define SMALL_SOPS 8
1095 struct sembuf small_sops[SMALL_SOPS];
1096 int semid = uap->semid;
1097 size_t nsops = uap->nsops;
1099 struct sembuf *sops;
1100 struct semid_kernel *semakptr;
1101 struct sembuf *sopptr = NULL;
1102 struct sem *semptr = NULL;
1103 struct sem_undo *suptr;
1104 struct mtx *sema_mtxp;
1107 int do_wakeup, do_undos;
1113 DPRINTF(("call to semop(%d, %p, %u)\n", semid, sops, nsops));
1115 AUDIT_ARG_SVIPC_ID(semid);
1117 rpr = sem_find_prison(td->td_ucred);
1121 semid = IPCID_TO_IX(semid); /* Convert back to zero origin */
1123 if (semid < 0 || semid >= seminfo.semmni)
1126 /* Allocate memory for sem_ops */
1127 if (nsops <= SMALL_SOPS)
1129 else if (nsops > seminfo.semopm) {
1130 DPRINTF(("too many sops (max=%d, nsops=%d)\n", seminfo.semopm,
1136 PROC_LOCK(td->td_proc);
1138 racct_get_available(td->td_proc, RACCT_NSEMOP)) {
1139 PROC_UNLOCK(td->td_proc);
1142 PROC_UNLOCK(td->td_proc);
1146 sops = malloc(nsops * sizeof(*sops), M_TEMP, M_WAITOK);
1148 if ((error = copyin(uap->sops, sops, nsops * sizeof(sops[0]))) != 0) {
1149 DPRINTF(("error = %d from copyin(%p, %p, %d)\n", error,
1150 uap->sops, sops, nsops * sizeof(sops[0])));
1151 if (sops != small_sops)
1156 semakptr = &sema[semid];
1157 sema_mtxp = &sema_mtx[semid];
1158 mtx_lock(sema_mtxp);
1159 if ((semakptr->u.sem_perm.mode & SEM_ALLOC) == 0) {
1163 seq = semakptr->u.sem_perm.seq;
1164 if (seq != IPCID_TO_SEQ(uap->semid)) {
1168 if ((error = sem_prison_cansee(rpr, semakptr)) != 0)
1171 * Initial pass through sops to see what permissions are needed.
1172 * Also perform any checks that don't need repeating on each
1173 * attempt to satisfy the request vector.
1175 j = 0; /* permission needed */
1177 for (i = 0; i < nsops; i++) {
1179 if (sopptr->sem_num >= semakptr->u.sem_nsems) {
1183 if (sopptr->sem_flg & SEM_UNDO && sopptr->sem_op != 0)
1185 j |= (sopptr->sem_op == 0) ? SEM_R : SEM_A;
1188 if ((error = ipcperm(td, &semakptr->u.sem_perm, j))) {
1189 DPRINTF(("error = %d from ipaccess\n", error));
1193 error = mac_sysvsem_check_semop(td->td_ucred, semakptr, j);
1199 * Loop trying to satisfy the vector of requests.
1200 * If we reach a point where we must wait, any requests already
1201 * performed are rolled back and we go to sleep until some other
1202 * process wakes us up. At this point, we start all over again.
1204 * This ensures that from the perspective of other tasks, a set
1205 * of requests is atomic (never partially satisfied).
1209 error = 0; /* error return if necessary */
1211 for (i = 0; i < nsops; i++) {
1213 semptr = &semakptr->u.__sem_base[sopptr->sem_num];
1216 "semop: semakptr=%p, __sem_base=%p, "
1217 "semptr=%p, sem[%d]=%d : op=%d, flag=%s\n",
1218 semakptr, semakptr->u.__sem_base, semptr,
1219 sopptr->sem_num, semptr->semval, sopptr->sem_op,
1220 (sopptr->sem_flg & IPC_NOWAIT) ?
1221 "nowait" : "wait"));
1223 if (sopptr->sem_op < 0) {
1224 if (semptr->semval + sopptr->sem_op < 0) {
1225 DPRINTF(("semop: can't do it now\n"));
1228 semptr->semval += sopptr->sem_op;
1229 if (semptr->semval == 0 &&
1230 semptr->semzcnt > 0)
1233 } else if (sopptr->sem_op == 0) {
1234 if (semptr->semval != 0) {
1235 DPRINTF(("semop: not zero now\n"));
1238 } else if (semptr->semval + sopptr->sem_op >
1243 if (semptr->semncnt > 0)
1245 semptr->semval += sopptr->sem_op;
1250 * Did we get through the entire vector?
1256 * No ... rollback anything that we've already done
1258 DPRINTF(("semop: rollback 0 through %d\n", i-1));
1259 for (j = 0; j < i; j++)
1260 semakptr->u.__sem_base[sops[j].sem_num].semval -=
1263 /* If we detected an error, return it */
1268 * If the request that we couldn't satisfy has the
1269 * NOWAIT flag set then return with EAGAIN.
1271 if (sopptr->sem_flg & IPC_NOWAIT) {
1276 if (sopptr->sem_op == 0)
1281 DPRINTF(("semop: good night!\n"));
1282 error = msleep(semakptr, sema_mtxp, (PZERO - 4) | PCATCH,
1284 DPRINTF(("semop: good morning (error=%d)!\n", error));
1285 /* return code is checked below, after sem[nz]cnt-- */
1288 * Make sure that the semaphore still exists
1290 seq = semakptr->u.sem_perm.seq;
1291 if ((semakptr->u.sem_perm.mode & SEM_ALLOC) == 0 ||
1292 seq != IPCID_TO_SEQ(uap->semid)) {
1298 * Renew the semaphore's pointer after wakeup since
1299 * during msleep __sem_base may have been modified and semptr
1300 * is not valid any more
1302 semptr = &semakptr->u.__sem_base[sopptr->sem_num];
1305 * The semaphore is still alive. Readjust the count of
1306 * waiting processes.
1308 if (sopptr->sem_op == 0)
1314 * Is it really morning, or was our sleep interrupted?
1315 * (Delayed check of msleep() return code because we
1316 * need to decrement sem[nz]cnt either way.)
1322 DPRINTF(("semop: good morning!\n"));
1327 * Process any SEM_UNDO requests.
1332 for (i = 0; i < nsops; i++) {
1334 * We only need to deal with SEM_UNDO's for non-zero
1339 if ((sops[i].sem_flg & SEM_UNDO) == 0)
1341 adjval = sops[i].sem_op;
1344 error = semundo_adjust(td, &suptr, semid, seq,
1345 sops[i].sem_num, -adjval);
1350 * Oh-Oh! We ran out of either sem_undo's or undo's.
1351 * Rollback the adjustments to this point and then
1352 * rollback the semaphore ups and down so we can return
1353 * with an error with all structures restored. We
1354 * rollback the undo's in the exact reverse order that
1355 * we applied them. This guarantees that we won't run
1356 * out of space as we roll things back out.
1358 for (j = 0; j < i; j++) {
1360 if ((sops[k].sem_flg & SEM_UNDO) == 0)
1362 adjval = sops[k].sem_op;
1365 if (semundo_adjust(td, &suptr, semid, seq,
1366 sops[k].sem_num, adjval) != 0)
1367 panic("semop - can't undo undos");
1370 for (j = 0; j < nsops; j++)
1371 semakptr->u.__sem_base[sops[j].sem_num].semval -=
1374 DPRINTF(("error = %d from semundo_adjust\n", error));
1377 } /* loop through the sops */
1379 } /* if (do_undos) */
1381 /* We're definitely done - set the sempid's and time */
1382 for (i = 0; i < nsops; i++) {
1384 semptr = &semakptr->u.__sem_base[sopptr->sem_num];
1385 semptr->sempid = td->td_proc->p_pid;
1387 semakptr->u.sem_otime = time_second;
1390 * Do a wakeup if any semaphore was up'd whilst something was
1394 DPRINTF(("semop: doing wakeup\n"));
1396 DPRINTF(("semop: back from wakeup\n"));
1398 DPRINTF(("semop: done\n"));
1399 td->td_retval[0] = 0;
1401 mtx_unlock(sema_mtxp);
1402 if (sops != small_sops)
1408 * Go through the undo structures for this process and apply the adjustments to
1412 semexit_myhook(void *arg, struct proc *p)
1414 struct sem_undo *suptr;
1415 struct semid_kernel *semakptr;
1416 struct mtx *sema_mtxp;
1417 int semid, semnum, adjval, ix;
1421 * Go through the chain of undo vectors looking for one
1422 * associated with this process.
1424 if (LIST_EMPTY(&semu_list))
1427 LIST_FOREACH(suptr, &semu_list, un_next) {
1428 if (suptr->un_proc == p)
1431 if (suptr == NULL) {
1435 LIST_REMOVE(suptr, un_next);
1437 DPRINTF(("proc @%p has undo structure with %d entries\n", p,
1441 * If there are any active undo elements then process them.
1443 if (suptr->un_cnt > 0) {
1445 for (ix = 0; ix < suptr->un_cnt; ix++) {
1446 semid = suptr->un_ent[ix].un_id;
1447 semnum = suptr->un_ent[ix].un_num;
1448 adjval = suptr->un_ent[ix].un_adjval;
1449 seq = suptr->un_ent[ix].un_seq;
1450 semakptr = &sema[semid];
1451 sema_mtxp = &sema_mtx[semid];
1453 mtx_lock(sema_mtxp);
1454 if ((semakptr->u.sem_perm.mode & SEM_ALLOC) == 0 ||
1455 (semakptr->u.sem_perm.seq != seq)) {
1456 mtx_unlock(sema_mtxp);
1459 if (semnum >= semakptr->u.sem_nsems)
1460 panic("semexit - semnum out of range");
1463 "semexit: %p id=%d num=%d(adj=%d) ; sem=%d\n",
1464 suptr->un_proc, suptr->un_ent[ix].un_id,
1465 suptr->un_ent[ix].un_num,
1466 suptr->un_ent[ix].un_adjval,
1467 semakptr->u.__sem_base[semnum].semval));
1469 if (adjval < 0 && semakptr->u.__sem_base[semnum].semval <
1471 semakptr->u.__sem_base[semnum].semval = 0;
1473 semakptr->u.__sem_base[semnum].semval += adjval;
1476 DPRINTF(("semexit: back from wakeup\n"));
1477 mtx_unlock(sema_mtxp);
1483 * Deallocate the undo vector.
1485 DPRINTF(("removing vector\n"));
1486 suptr->un_proc = NULL;
1488 LIST_INSERT_HEAD(&semu_free_list, suptr, un_next);
1493 sysctl_sema(SYSCTL_HANDLER_ARGS)
1495 struct prison *pr, *rpr;
1496 struct semid_kernel tsemak;
1497 #ifdef COMPAT_FREEBSD32
1498 struct semid_kernel32 tsemak32;
1504 pr = req->td->td_ucred->cr_prison;
1505 rpr = sem_find_prison(req->td->td_ucred);
1507 for (i = 0; i < seminfo.semmni; i++) {
1508 mtx_lock(&sema_mtx[i]);
1509 if ((sema[i].u.sem_perm.mode & SEM_ALLOC) == 0 ||
1510 rpr == NULL || sem_prison_cansee(rpr, &sema[i]) != 0)
1511 bzero(&tsemak, sizeof(tsemak));
1514 if (tsemak.cred->cr_prison != pr)
1515 tsemak.u.sem_perm.key = IPC_PRIVATE;
1517 mtx_unlock(&sema_mtx[i]);
1518 #ifdef COMPAT_FREEBSD32
1519 if (SV_CURPROC_FLAG(SV_ILP32)) {
1520 bzero(&tsemak32, sizeof(tsemak32));
1521 freebsd32_ipcperm_out(&tsemak.u.sem_perm,
1522 &tsemak32.u.sem_perm);
1523 /* Don't copy u.__sem_base */
1524 CP(tsemak, tsemak32, u.sem_nsems);
1525 CP(tsemak, tsemak32, u.sem_otime);
1526 CP(tsemak, tsemak32, u.sem_ctime);
1527 /* Don't copy label or cred */
1528 outaddr = &tsemak32;
1529 outsize = sizeof(tsemak32);
1533 tsemak.u.__sem_base = NULL;
1534 tsemak.label = NULL;
1537 outsize = sizeof(tsemak);
1539 error = SYSCTL_OUT(req, outaddr, outsize);
1547 sem_prison_check(void *obj, void *data)
1549 struct prison *pr = obj;
1550 struct prison *prpr;
1551 struct vfsoptlist *opts = data;
1555 * sysvsem is a jailsys integer.
1556 * It must be "disable" if the parent jail is disabled.
1558 error = vfs_copyopt(opts, "sysvsem", &jsys, sizeof(jsys));
1559 if (error != ENOENT) {
1563 case JAIL_SYS_DISABLE:
1566 case JAIL_SYS_INHERIT:
1567 prison_lock(pr->pr_parent);
1568 prpr = osd_jail_get(pr->pr_parent, sem_prison_slot);
1569 prison_unlock(pr->pr_parent);
1582 sem_prison_set(void *obj, void *data)
1584 struct prison *pr = obj;
1585 struct prison *tpr, *orpr, *nrpr, *trpr;
1586 struct vfsoptlist *opts = data;
1591 * sysvsem controls which jail is the root of the associated sems (this
1592 * jail or same as the parent), or if the feature is available at all.
1594 if (vfs_copyopt(opts, "sysvsem", &jsys, sizeof(jsys)) == ENOENT)
1595 jsys = vfs_flagopt(opts, "allow.sysvipc", NULL, 0)
1597 : vfs_flagopt(opts, "allow.nosysvipc", NULL, 0)
1600 if (jsys == JAIL_SYS_DISABLE) {
1602 orpr = osd_jail_get(pr, sem_prison_slot);
1604 osd_jail_del(pr, sem_prison_slot);
1608 sem_prison_cleanup(pr);
1609 /* Disable all child jails as well. */
1610 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1612 trpr = osd_jail_get(tpr, sem_prison_slot);
1614 osd_jail_del(tpr, sem_prison_slot);
1617 sem_prison_cleanup(tpr);
1624 } else if (jsys != -1) {
1625 if (jsys == JAIL_SYS_NEW)
1628 prison_lock(pr->pr_parent);
1629 nrpr = osd_jail_get(pr->pr_parent, sem_prison_slot);
1630 prison_unlock(pr->pr_parent);
1632 rsv = osd_reserve(sem_prison_slot);
1634 orpr = osd_jail_get(pr, sem_prison_slot);
1636 (void)osd_jail_set_reserved(pr, sem_prison_slot, rsv,
1639 osd_free_reserved(rsv);
1643 sem_prison_cleanup(pr);
1645 /* Change child jails matching the old root, */
1646 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1648 trpr = osd_jail_get(tpr,
1651 (void)osd_jail_set(tpr,
1652 sem_prison_slot, nrpr);
1655 sem_prison_cleanup(tpr);
1669 sem_prison_get(void *obj, void *data)
1671 struct prison *pr = obj;
1673 struct vfsoptlist *opts = data;
1676 /* Set sysvsem based on the jail's root prison. */
1678 rpr = osd_jail_get(pr, sem_prison_slot);
1680 jsys = rpr == NULL ? JAIL_SYS_DISABLE
1681 : rpr == pr ? JAIL_SYS_NEW : JAIL_SYS_INHERIT;
1682 error = vfs_setopt(opts, "sysvsem", &jsys, sizeof(jsys));
1683 if (error == ENOENT)
1689 sem_prison_remove(void *obj, void *data __unused)
1691 struct prison *pr = obj;
1695 rpr = osd_jail_get(pr, sem_prison_slot);
1698 sem_prison_cleanup(pr);
1703 sem_prison_cleanup(struct prison *pr)
1707 /* Remove any sems that belong to this jail. */
1709 for (i = 0; i < seminfo.semmni; i++) {
1710 if ((sema[i].u.sem_perm.mode & SEM_ALLOC) &&
1711 sema[i].cred != NULL && sema[i].cred->cr_prison == pr) {
1712 mtx_lock(&sema_mtx[i]);
1713 sem_remove(i, NULL);
1714 mtx_unlock(&sema_mtx[i]);
1717 mtx_unlock(&sem_mtx);
1720 SYSCTL_JAIL_PARAM_SYS_NODE(sysvsem, CTLFLAG_RW, "SYSV semaphores");
1722 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1723 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1725 /* XXX casting to (sy_call_t *) is bogus, as usual. */
1726 static sy_call_t *semcalls[] = {
1727 (sy_call_t *)freebsd7___semctl, (sy_call_t *)sys_semget,
1728 (sy_call_t *)sys_semop
1732 * Entry point for all SEM calls.
1737 /* XXX actually varargs. */
1738 struct semsys_args /* {
1748 AUDIT_ARG_SVIPC_WHICH(uap->which);
1749 if (uap->which < 0 || uap->which >= nitems(semcalls))
1751 error = (*semcalls[uap->which])(td, &uap->a2);
1756 #define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0)
1759 #ifndef _SYS_SYSPROTO_H_
1760 struct freebsd7___semctl_args {
1764 union semun_old *arg;
1768 freebsd7___semctl(struct thread *td, struct freebsd7___semctl_args *uap)
1770 struct semid_ds_old dsold;
1771 struct semid_ds dsbuf;
1772 union semun_old arg;
1784 error = copyin(uap->arg, &arg, sizeof(arg));
1796 error = copyin(arg.buf, &dsold, sizeof(dsold));
1799 ipcperm_old2new(&dsold.sem_perm, &dsbuf.sem_perm);
1800 CP(dsold, dsbuf, __sem_base);
1801 CP(dsold, dsbuf, sem_nsems);
1802 CP(dsold, dsbuf, sem_otime);
1803 CP(dsold, dsbuf, sem_ctime);
1808 semun.array = arg.array;
1811 semun.val = arg.val;
1815 error = kern_semctl(td, uap->semid, uap->semnum, uap->cmd, &semun,
1823 bzero(&dsold, sizeof(dsold));
1824 ipcperm_new2old(&dsbuf.sem_perm, &dsold.sem_perm);
1825 CP(dsbuf, dsold, __sem_base);
1826 CP(dsbuf, dsold, sem_nsems);
1827 CP(dsbuf, dsold, sem_otime);
1828 CP(dsbuf, dsold, sem_ctime);
1829 error = copyout(&dsold, arg.buf, sizeof(dsold));
1834 td->td_retval[0] = rval;
1838 #endif /* COMPAT_FREEBSD{4,5,6,7} */
1840 #ifdef COMPAT_FREEBSD32
1843 freebsd32_semsys(struct thread *td, struct freebsd32_semsys_args *uap)
1846 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1847 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1848 AUDIT_ARG_SVIPC_WHICH(uap->which);
1849 switch (uap->which) {
1851 return (freebsd7_freebsd32_semctl(td,
1852 (struct freebsd7_freebsd32_semctl_args *)&uap->a2));
1854 return (sys_semsys(td, (struct semsys_args *)uap));
1857 return (nosys(td, NULL));
1861 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1862 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1864 freebsd7_freebsd32_semctl(struct thread *td,
1865 struct freebsd7_freebsd32_semctl_args *uap)
1867 struct semid_ds32_old dsbuf32;
1868 struct semid_ds dsbuf;
1881 error = copyin(uap->arg, &arg, sizeof(arg));
1893 error = copyin(PTRIN(arg.buf), &dsbuf32, sizeof(dsbuf32));
1896 freebsd32_ipcperm_old_in(&dsbuf32.sem_perm, &dsbuf.sem_perm);
1897 PTRIN_CP(dsbuf32, dsbuf, __sem_base);
1898 CP(dsbuf32, dsbuf, sem_nsems);
1899 CP(dsbuf32, dsbuf, sem_otime);
1900 CP(dsbuf32, dsbuf, sem_ctime);
1905 semun.array = PTRIN(arg.array);
1908 semun.val = arg.val;
1912 error = kern_semctl(td, uap->semid, uap->semnum, uap->cmd, &semun,
1920 bzero(&dsbuf32, sizeof(dsbuf32));
1921 freebsd32_ipcperm_old_out(&dsbuf.sem_perm, &dsbuf32.sem_perm);
1922 PTROUT_CP(dsbuf, dsbuf32, __sem_base);
1923 CP(dsbuf, dsbuf32, sem_nsems);
1924 CP(dsbuf, dsbuf32, sem_otime);
1925 CP(dsbuf, dsbuf32, sem_ctime);
1926 error = copyout(&dsbuf32, PTRIN(arg.buf), sizeof(dsbuf32));
1931 td->td_retval[0] = rval;
1937 freebsd32_semctl(struct thread *td, struct freebsd32_semctl_args *uap)
1939 struct semid_ds32 dsbuf32;
1940 struct semid_ds dsbuf;
1953 error = copyin(uap->arg, &arg, sizeof(arg));
1965 error = copyin(PTRIN(arg.buf), &dsbuf32, sizeof(dsbuf32));
1968 freebsd32_ipcperm_in(&dsbuf32.sem_perm, &dsbuf.sem_perm);
1969 PTRIN_CP(dsbuf32, dsbuf, __sem_base);
1970 CP(dsbuf32, dsbuf, sem_nsems);
1971 CP(dsbuf32, dsbuf, sem_otime);
1972 CP(dsbuf32, dsbuf, sem_ctime);
1977 semun.array = PTRIN(arg.array);
1980 semun.val = arg.val;
1984 error = kern_semctl(td, uap->semid, uap->semnum, uap->cmd, &semun,
1992 bzero(&dsbuf32, sizeof(dsbuf32));
1993 freebsd32_ipcperm_out(&dsbuf.sem_perm, &dsbuf32.sem_perm);
1994 PTROUT_CP(dsbuf, dsbuf32, __sem_base);
1995 CP(dsbuf, dsbuf32, sem_nsems);
1996 CP(dsbuf, dsbuf32, sem_otime);
1997 CP(dsbuf, dsbuf32, sem_ctime);
1998 error = copyout(&dsbuf32, PTRIN(arg.buf), sizeof(dsbuf32));
2003 td->td_retval[0] = rval;
2007 #endif /* COMPAT_FREEBSD32 */