Require both the prison mutex and allprison_lock when pr_ref or pr_uref go to/from zero. Adding a non-first or removing a non-last reference remain lock-free. This means that a shared hold on allprison_lock is sufficient for prison_isalive() to be useful, which removes a number of cases of lock/check/unlock on the prison mutex. Expand the locking in kern_jail_set() to keep allprison_lock held exclusive until the new prison is valid, thus making invalid prisons invisible to any thread holding allprison_lock (except of course the one creating or destroying the prison). This renders prison_isvalid() nearly redundant, now used only in asserts. Differential Revision: https://reviews.freebsd.org/D28419 Differential Revision: https://reviews.freebsd.org/D28458
2011 lines
50 KiB
C
2011 lines
50 KiB
C
/*-
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* Implementation of SVID semaphores
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*
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* Author: Daniel Boulet
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*
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* This software is provided ``AS IS'' without any warranties of any kind.
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*/
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/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2003-2005 McAfee, Inc.
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* Copyright (c) 2016-2017 Robert N. M. Watson
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project in part by McAfee
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* Research, the Security Research Division of McAfee, Inc under DARPA/SPAWAR
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* contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS research
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* program.
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*
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* Portions of this software were developed by BAE Systems, the University of
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* Cambridge Computer Laboratory, and Memorial University under DARPA/AFRL
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* contract FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent
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* Computing (TC) research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_sysvipc.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/abi_compat.h>
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#include <sys/eventhandler.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/racct.h>
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#include <sys/sem.h>
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#include <sys/sx.h>
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#include <sys/syscall.h>
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#include <sys/syscallsubr.h>
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#include <sys/sysent.h>
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#include <sys/sysctl.h>
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#include <sys/uio.h>
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#include <sys/malloc.h>
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#include <sys/jail.h>
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#include <security/audit/audit.h>
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#include <security/mac/mac_framework.h>
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FEATURE(sysv_sem, "System V semaphores support");
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static MALLOC_DEFINE(M_SEM, "sem", "SVID compatible semaphores");
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#ifdef SEM_DEBUG
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#define DPRINTF(a) printf a
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#else
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#define DPRINTF(a)
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#endif
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static int seminit(void);
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static int sysvsem_modload(struct module *, int, void *);
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static int semunload(void);
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static void semexit_myhook(void *arg, struct proc *p);
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static int sysctl_sema(SYSCTL_HANDLER_ARGS);
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static int semvalid(int semid, struct prison *rpr,
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struct semid_kernel *semakptr);
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static void sem_remove(int semidx, struct ucred *cred);
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static struct prison *sem_find_prison(struct ucred *);
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static int sem_prison_cansee(struct prison *, struct semid_kernel *);
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static int sem_prison_check(void *, void *);
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static int sem_prison_set(void *, void *);
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static int sem_prison_get(void *, void *);
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static int sem_prison_remove(void *, void *);
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static void sem_prison_cleanup(struct prison *);
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#ifndef _SYS_SYSPROTO_H_
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struct __semctl_args;
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int __semctl(struct thread *td, struct __semctl_args *uap);
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struct semget_args;
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int semget(struct thread *td, struct semget_args *uap);
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struct semop_args;
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int semop(struct thread *td, struct semop_args *uap);
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#endif
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static struct sem_undo *semu_alloc(struct thread *td);
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static int semundo_adjust(struct thread *td, struct sem_undo **supptr,
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int semid, int semseq, int semnum, int adjval);
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static void semundo_clear(int semid, int semnum);
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static struct mtx sem_mtx; /* semaphore global lock */
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static struct mtx sem_undo_mtx;
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static int semtot = 0;
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static struct semid_kernel *sema; /* semaphore id pool */
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static struct mtx *sema_mtx; /* semaphore id pool mutexes*/
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static struct sem *sem; /* semaphore pool */
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LIST_HEAD(, sem_undo) semu_list; /* list of active undo structures */
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LIST_HEAD(, sem_undo) semu_free_list; /* list of free undo structures */
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static int *semu; /* undo structure pool */
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static eventhandler_tag semexit_tag;
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static unsigned sem_prison_slot; /* prison OSD slot */
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#define SEMUNDO_MTX sem_undo_mtx
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#define SEMUNDO_LOCK() mtx_lock(&SEMUNDO_MTX);
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#define SEMUNDO_UNLOCK() mtx_unlock(&SEMUNDO_MTX);
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#define SEMUNDO_LOCKASSERT(how) mtx_assert(&SEMUNDO_MTX, (how));
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struct sem {
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u_short semval; /* semaphore value */
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pid_t sempid; /* pid of last operation */
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u_short semncnt; /* # awaiting semval > cval */
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u_short semzcnt; /* # awaiting semval = 0 */
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};
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/*
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* Undo structure (one per process)
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*/
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struct sem_undo {
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LIST_ENTRY(sem_undo) un_next; /* ptr to next active undo structure */
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struct proc *un_proc; /* owner of this structure */
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short un_cnt; /* # of active entries */
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struct undo {
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short un_adjval; /* adjust on exit values */
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short un_num; /* semaphore # */
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int un_id; /* semid */
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unsigned short un_seq;
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} un_ent[1]; /* undo entries */
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};
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/*
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* Configuration parameters
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*/
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#ifndef SEMMNI
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#define SEMMNI 50 /* # of semaphore identifiers */
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#endif
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#ifndef SEMMNS
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#define SEMMNS 340 /* # of semaphores in system */
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#endif
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#ifndef SEMUME
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#define SEMUME 50 /* max # of undo entries per process */
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#endif
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#ifndef SEMMNU
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#define SEMMNU 150 /* # of undo structures in system */
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#endif
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/* shouldn't need tuning */
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#ifndef SEMMSL
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#define SEMMSL SEMMNS /* max # of semaphores per id */
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#endif
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#ifndef SEMOPM
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#define SEMOPM 100 /* max # of operations per semop call */
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#endif
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#define SEMVMX 32767 /* semaphore maximum value */
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#define SEMAEM 16384 /* adjust on exit max value */
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/*
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* Due to the way semaphore memory is allocated, we have to ensure that
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* SEMUSZ is properly aligned.
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*/
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#define SEM_ALIGN(bytes) roundup2(bytes, sizeof(long))
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/* actual size of an undo structure */
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#define SEMUSZ(x) SEM_ALIGN(offsetof(struct sem_undo, un_ent[(x)]))
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/*
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* Macro to find a particular sem_undo vector
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*/
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#define SEMU(ix) \
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((struct sem_undo *)(((intptr_t)semu) + (ix) * seminfo.semusz))
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/*
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* semaphore info struct
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*/
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struct seminfo seminfo = {
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.semmni = SEMMNI, /* # of semaphore identifiers */
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.semmns = SEMMNS, /* # of semaphores in system */
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.semmnu = SEMMNU, /* # of undo structures in system */
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.semmsl = SEMMSL, /* max # of semaphores per id */
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.semopm = SEMOPM, /* max # of operations per semop call */
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.semume = SEMUME, /* max # of undo entries per process */
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.semusz = SEMUSZ(SEMUME), /* size in bytes of undo structure */
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.semvmx = SEMVMX, /* semaphore maximum value */
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.semaem = SEMAEM, /* adjust on exit max value */
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};
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SYSCTL_INT(_kern_ipc, OID_AUTO, semmni, CTLFLAG_RDTUN, &seminfo.semmni, 0,
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"Number of semaphore identifiers");
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SYSCTL_INT(_kern_ipc, OID_AUTO, semmns, CTLFLAG_RDTUN, &seminfo.semmns, 0,
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"Maximum number of semaphores in the system");
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SYSCTL_INT(_kern_ipc, OID_AUTO, semmnu, CTLFLAG_RDTUN, &seminfo.semmnu, 0,
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"Maximum number of undo structures in the system");
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SYSCTL_INT(_kern_ipc, OID_AUTO, semmsl, CTLFLAG_RWTUN, &seminfo.semmsl, 0,
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"Max semaphores per id");
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SYSCTL_INT(_kern_ipc, OID_AUTO, semopm, CTLFLAG_RDTUN, &seminfo.semopm, 0,
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"Max operations per semop call");
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SYSCTL_INT(_kern_ipc, OID_AUTO, semume, CTLFLAG_RDTUN, &seminfo.semume, 0,
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"Max undo entries per process");
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SYSCTL_INT(_kern_ipc, OID_AUTO, semusz, CTLFLAG_RD, &seminfo.semusz, 0,
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"Size in bytes of undo structure");
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SYSCTL_INT(_kern_ipc, OID_AUTO, semvmx, CTLFLAG_RWTUN, &seminfo.semvmx, 0,
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"Semaphore maximum value");
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SYSCTL_INT(_kern_ipc, OID_AUTO, semaem, CTLFLAG_RWTUN, &seminfo.semaem, 0,
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"Adjust on exit max value");
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SYSCTL_PROC(_kern_ipc, OID_AUTO, sema,
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CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE,
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NULL, 0, sysctl_sema, "",
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"Array of struct semid_kernel for each potential semaphore");
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static struct syscall_helper_data sem_syscalls[] = {
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SYSCALL_INIT_HELPER(__semctl),
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SYSCALL_INIT_HELPER(semget),
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SYSCALL_INIT_HELPER(semop),
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#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
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defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
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SYSCALL_INIT_HELPER(semsys),
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SYSCALL_INIT_HELPER_COMPAT(freebsd7___semctl),
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#endif
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SYSCALL_INIT_LAST
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};
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#ifdef COMPAT_FREEBSD32
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#include <compat/freebsd32/freebsd32.h>
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#include <compat/freebsd32/freebsd32_ipc.h>
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#include <compat/freebsd32/freebsd32_proto.h>
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#include <compat/freebsd32/freebsd32_signal.h>
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#include <compat/freebsd32/freebsd32_syscall.h>
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#include <compat/freebsd32/freebsd32_util.h>
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static struct syscall_helper_data sem32_syscalls[] = {
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SYSCALL32_INIT_HELPER(freebsd32_semctl),
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SYSCALL32_INIT_HELPER_COMPAT(semget),
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SYSCALL32_INIT_HELPER_COMPAT(semop),
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SYSCALL32_INIT_HELPER(freebsd32_semsys),
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#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
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defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
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SYSCALL32_INIT_HELPER(freebsd7_freebsd32_semctl),
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#endif
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SYSCALL_INIT_LAST
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};
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#endif
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static int
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seminit(void)
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{
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struct prison *pr;
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void **rsv;
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int i, error;
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osd_method_t methods[PR_MAXMETHOD] = {
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[PR_METHOD_CHECK] = sem_prison_check,
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[PR_METHOD_SET] = sem_prison_set,
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[PR_METHOD_GET] = sem_prison_get,
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[PR_METHOD_REMOVE] = sem_prison_remove,
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};
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sem = malloc(sizeof(struct sem) * seminfo.semmns, M_SEM, M_WAITOK);
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sema = malloc(sizeof(struct semid_kernel) * seminfo.semmni, M_SEM,
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M_WAITOK | M_ZERO);
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sema_mtx = malloc(sizeof(struct mtx) * seminfo.semmni, M_SEM,
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M_WAITOK | M_ZERO);
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seminfo.semusz = SEMUSZ(seminfo.semume);
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semu = malloc(seminfo.semmnu * seminfo.semusz, M_SEM, M_WAITOK);
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for (i = 0; i < seminfo.semmni; i++) {
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sema[i].u.__sem_base = 0;
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sema[i].u.sem_perm.mode = 0;
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sema[i].u.sem_perm.seq = 0;
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#ifdef MAC
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mac_sysvsem_init(&sema[i]);
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#endif
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}
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for (i = 0; i < seminfo.semmni; i++)
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mtx_init(&sema_mtx[i], "semid", NULL, MTX_DEF);
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LIST_INIT(&semu_free_list);
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for (i = 0; i < seminfo.semmnu; i++) {
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struct sem_undo *suptr = SEMU(i);
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suptr->un_proc = NULL;
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LIST_INSERT_HEAD(&semu_free_list, suptr, un_next);
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}
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LIST_INIT(&semu_list);
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mtx_init(&sem_mtx, "sem", NULL, MTX_DEF);
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mtx_init(&sem_undo_mtx, "semu", NULL, MTX_DEF);
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semexit_tag = EVENTHANDLER_REGISTER(process_exit, semexit_myhook, NULL,
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EVENTHANDLER_PRI_ANY);
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/* Set current prisons according to their allow.sysvipc. */
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sem_prison_slot = osd_jail_register(NULL, methods);
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rsv = osd_reserve(sem_prison_slot);
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prison_lock(&prison0);
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(void)osd_jail_set_reserved(&prison0, sem_prison_slot, rsv, &prison0);
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prison_unlock(&prison0);
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rsv = NULL;
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sx_slock(&allprison_lock);
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TAILQ_FOREACH(pr, &allprison, pr_list) {
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if (rsv == NULL)
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rsv = osd_reserve(sem_prison_slot);
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prison_lock(pr);
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if (pr->pr_allow & PR_ALLOW_SYSVIPC) {
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(void)osd_jail_set_reserved(pr, sem_prison_slot, rsv,
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&prison0);
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rsv = NULL;
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}
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prison_unlock(pr);
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}
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if (rsv != NULL)
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osd_free_reserved(rsv);
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sx_sunlock(&allprison_lock);
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error = syscall_helper_register(sem_syscalls, SY_THR_STATIC_KLD);
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if (error != 0)
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return (error);
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#ifdef COMPAT_FREEBSD32
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error = syscall32_helper_register(sem32_syscalls, SY_THR_STATIC_KLD);
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if (error != 0)
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return (error);
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#endif
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return (0);
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}
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static int
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semunload(void)
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{
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int i;
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/* XXXKIB */
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if (semtot != 0)
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return (EBUSY);
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#ifdef COMPAT_FREEBSD32
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syscall32_helper_unregister(sem32_syscalls);
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#endif
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syscall_helper_unregister(sem_syscalls);
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EVENTHANDLER_DEREGISTER(process_exit, semexit_tag);
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if (sem_prison_slot != 0)
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osd_jail_deregister(sem_prison_slot);
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#ifdef MAC
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for (i = 0; i < seminfo.semmni; i++)
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mac_sysvsem_destroy(&sema[i]);
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#endif
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free(sem, M_SEM);
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free(sema, M_SEM);
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free(semu, M_SEM);
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for (i = 0; i < seminfo.semmni; i++)
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mtx_destroy(&sema_mtx[i]);
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free(sema_mtx, M_SEM);
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mtx_destroy(&sem_mtx);
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mtx_destroy(&sem_undo_mtx);
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return (0);
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}
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static int
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sysvsem_modload(struct module *module, int cmd, void *arg)
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{
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int error = 0;
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switch (cmd) {
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case MOD_LOAD:
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error = seminit();
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break;
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case MOD_UNLOAD:
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error = semunload();
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break;
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case MOD_SHUTDOWN:
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break;
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default:
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error = EINVAL;
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break;
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}
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return (error);
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}
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static moduledata_t sysvsem_mod = {
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"sysvsem",
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&sysvsem_modload,
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NULL
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};
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DECLARE_MODULE(sysvsem, sysvsem_mod, SI_SUB_SYSV_SEM, SI_ORDER_FIRST);
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MODULE_VERSION(sysvsem, 1);
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/*
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* Allocate a new sem_undo structure for a process
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* (returns ptr to structure or NULL if no more room)
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*/
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static struct sem_undo *
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semu_alloc(struct thread *td)
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{
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struct sem_undo *suptr;
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SEMUNDO_LOCKASSERT(MA_OWNED);
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if ((suptr = LIST_FIRST(&semu_free_list)) == NULL)
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return (NULL);
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LIST_REMOVE(suptr, un_next);
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LIST_INSERT_HEAD(&semu_list, suptr, un_next);
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suptr->un_cnt = 0;
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suptr->un_proc = td->td_proc;
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return (suptr);
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}
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static int
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semu_try_free(struct sem_undo *suptr)
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{
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SEMUNDO_LOCKASSERT(MA_OWNED);
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if (suptr->un_cnt != 0)
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return (0);
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LIST_REMOVE(suptr, un_next);
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LIST_INSERT_HEAD(&semu_free_list, suptr, un_next);
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return (1);
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}
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/*
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* Adjust a particular entry for a particular proc
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*/
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static int
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semundo_adjust(struct thread *td, struct sem_undo **supptr, int semid,
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int semseq, int semnum, int adjval)
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{
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struct proc *p = td->td_proc;
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struct sem_undo *suptr;
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struct undo *sunptr;
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int i;
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|
SEMUNDO_LOCKASSERT(MA_OWNED);
|
|
/* Look for and remember the sem_undo if the caller doesn't provide
|
|
it */
|
|
|
|
suptr = *supptr;
|
|
if (suptr == NULL) {
|
|
LIST_FOREACH(suptr, &semu_list, un_next) {
|
|
if (suptr->un_proc == p) {
|
|
*supptr = suptr;
|
|
break;
|
|
}
|
|
}
|
|
if (suptr == NULL) {
|
|
if (adjval == 0)
|
|
return(0);
|
|
suptr = semu_alloc(td);
|
|
if (suptr == NULL)
|
|
return (ENOSPC);
|
|
*supptr = suptr;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Look for the requested entry and adjust it (delete if adjval becomes
|
|
* 0).
|
|
*/
|
|
sunptr = &suptr->un_ent[0];
|
|
for (i = 0; i < suptr->un_cnt; i++, sunptr++) {
|
|
if (sunptr->un_id != semid || sunptr->un_num != semnum)
|
|
continue;
|
|
if (adjval != 0) {
|
|
adjval += sunptr->un_adjval;
|
|
if (adjval > seminfo.semaem || adjval < -seminfo.semaem)
|
|
return (ERANGE);
|
|
}
|
|
sunptr->un_adjval = adjval;
|
|
if (sunptr->un_adjval == 0) {
|
|
suptr->un_cnt--;
|
|
if (i < suptr->un_cnt)
|
|
suptr->un_ent[i] =
|
|
suptr->un_ent[suptr->un_cnt];
|
|
if (suptr->un_cnt == 0)
|
|
semu_try_free(suptr);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/* Didn't find the right entry - create it */
|
|
if (adjval == 0)
|
|
return (0);
|
|
if (adjval > seminfo.semaem || adjval < -seminfo.semaem)
|
|
return (ERANGE);
|
|
if (suptr->un_cnt != seminfo.semume) {
|
|
sunptr = &suptr->un_ent[suptr->un_cnt];
|
|
suptr->un_cnt++;
|
|
sunptr->un_adjval = adjval;
|
|
sunptr->un_id = semid;
|
|
sunptr->un_num = semnum;
|
|
sunptr->un_seq = semseq;
|
|
} else
|
|
return (EINVAL);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
semundo_clear(int semid, int semnum)
|
|
{
|
|
struct sem_undo *suptr, *suptr1;
|
|
struct undo *sunptr;
|
|
int i;
|
|
|
|
SEMUNDO_LOCKASSERT(MA_OWNED);
|
|
LIST_FOREACH_SAFE(suptr, &semu_list, un_next, suptr1) {
|
|
sunptr = &suptr->un_ent[0];
|
|
for (i = 0; i < suptr->un_cnt; i++, sunptr++) {
|
|
if (sunptr->un_id != semid)
|
|
continue;
|
|
if (semnum == -1 || sunptr->un_num == semnum) {
|
|
suptr->un_cnt--;
|
|
if (i < suptr->un_cnt) {
|
|
suptr->un_ent[i] =
|
|
suptr->un_ent[suptr->un_cnt];
|
|
continue;
|
|
}
|
|
semu_try_free(suptr);
|
|
}
|
|
if (semnum != -1)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int
|
|
semvalid(int semid, struct prison *rpr, struct semid_kernel *semakptr)
|
|
{
|
|
|
|
return ((semakptr->u.sem_perm.mode & SEM_ALLOC) == 0 ||
|
|
semakptr->u.sem_perm.seq != IPCID_TO_SEQ(semid) ||
|
|
sem_prison_cansee(rpr, semakptr) ? EINVAL : 0);
|
|
}
|
|
|
|
static void
|
|
sem_remove(int semidx, struct ucred *cred)
|
|
{
|
|
struct semid_kernel *semakptr;
|
|
int i;
|
|
|
|
KASSERT(semidx >= 0 && semidx < seminfo.semmni,
|
|
("semidx out of bounds"));
|
|
mtx_assert(&sem_mtx, MA_OWNED);
|
|
semakptr = &sema[semidx];
|
|
KASSERT(semakptr->u.__sem_base - sem + semakptr->u.sem_nsems <= semtot,
|
|
("sem_remove: sema %d corrupted sem pointer %p %p %d %d",
|
|
semidx, semakptr->u.__sem_base, sem, semakptr->u.sem_nsems,
|
|
semtot));
|
|
|
|
semakptr->u.sem_perm.cuid = cred ? cred->cr_uid : 0;
|
|
semakptr->u.sem_perm.uid = cred ? cred->cr_uid : 0;
|
|
semakptr->u.sem_perm.mode = 0;
|
|
racct_sub_cred(semakptr->cred, RACCT_NSEM, semakptr->u.sem_nsems);
|
|
crfree(semakptr->cred);
|
|
semakptr->cred = NULL;
|
|
SEMUNDO_LOCK();
|
|
semundo_clear(semidx, -1);
|
|
SEMUNDO_UNLOCK();
|
|
#ifdef MAC
|
|
mac_sysvsem_cleanup(semakptr);
|
|
#endif
|
|
wakeup(semakptr);
|
|
for (i = 0; i < seminfo.semmni; i++) {
|
|
if ((sema[i].u.sem_perm.mode & SEM_ALLOC) &&
|
|
sema[i].u.__sem_base > semakptr->u.__sem_base)
|
|
mtx_lock_flags(&sema_mtx[i], LOP_DUPOK);
|
|
}
|
|
for (i = semakptr->u.__sem_base - sem + semakptr->u.sem_nsems;
|
|
i < semtot; i++)
|
|
sem[i - semakptr->u.sem_nsems] = sem[i];
|
|
for (i = 0; i < seminfo.semmni; i++) {
|
|
if ((sema[i].u.sem_perm.mode & SEM_ALLOC) &&
|
|
sema[i].u.__sem_base > semakptr->u.__sem_base) {
|
|
sema[i].u.__sem_base -= semakptr->u.sem_nsems;
|
|
mtx_unlock(&sema_mtx[i]);
|
|
}
|
|
}
|
|
semtot -= semakptr->u.sem_nsems;
|
|
}
|
|
|
|
static struct prison *
|
|
sem_find_prison(struct ucred *cred)
|
|
{
|
|
struct prison *pr, *rpr;
|
|
|
|
pr = cred->cr_prison;
|
|
prison_lock(pr);
|
|
rpr = osd_jail_get(pr, sem_prison_slot);
|
|
prison_unlock(pr);
|
|
return rpr;
|
|
}
|
|
|
|
static int
|
|
sem_prison_cansee(struct prison *rpr, struct semid_kernel *semakptr)
|
|
{
|
|
|
|
if (semakptr->cred == NULL ||
|
|
!(rpr == semakptr->cred->cr_prison ||
|
|
prison_ischild(rpr, semakptr->cred->cr_prison)))
|
|
return (EINVAL);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Note that the user-mode half of this passes a union, not a pointer.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct __semctl_args {
|
|
int semid;
|
|
int semnum;
|
|
int cmd;
|
|
union semun *arg;
|
|
};
|
|
#endif
|
|
int
|
|
sys___semctl(struct thread *td, struct __semctl_args *uap)
|
|
{
|
|
struct semid_ds dsbuf;
|
|
union semun arg, semun;
|
|
register_t rval;
|
|
int error;
|
|
|
|
switch (uap->cmd) {
|
|
case SEM_STAT:
|
|
case IPC_SET:
|
|
case IPC_STAT:
|
|
case GETALL:
|
|
case SETVAL:
|
|
case SETALL:
|
|
error = copyin(uap->arg, &arg, sizeof(arg));
|
|
if (error)
|
|
return (error);
|
|
break;
|
|
}
|
|
|
|
switch (uap->cmd) {
|
|
case SEM_STAT:
|
|
case IPC_STAT:
|
|
semun.buf = &dsbuf;
|
|
break;
|
|
case IPC_SET:
|
|
error = copyin(arg.buf, &dsbuf, sizeof(dsbuf));
|
|
if (error)
|
|
return (error);
|
|
semun.buf = &dsbuf;
|
|
break;
|
|
case GETALL:
|
|
case SETALL:
|
|
semun.array = arg.array;
|
|
break;
|
|
case SETVAL:
|
|
semun.val = arg.val;
|
|
break;
|
|
}
|
|
|
|
error = kern_semctl(td, uap->semid, uap->semnum, uap->cmd, &semun,
|
|
&rval);
|
|
if (error)
|
|
return (error);
|
|
|
|
switch (uap->cmd) {
|
|
case SEM_STAT:
|
|
case IPC_STAT:
|
|
error = copyout(&dsbuf, arg.buf, sizeof(dsbuf));
|
|
break;
|
|
}
|
|
|
|
if (error == 0)
|
|
td->td_retval[0] = rval;
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
kern_semctl(struct thread *td, int semid, int semnum, int cmd,
|
|
union semun *arg, register_t *rval)
|
|
{
|
|
u_short *array;
|
|
struct ucred *cred = td->td_ucred;
|
|
int i, error;
|
|
struct prison *rpr;
|
|
struct semid_ds *sbuf;
|
|
struct semid_kernel *semakptr;
|
|
struct mtx *sema_mtxp;
|
|
u_short usval, count;
|
|
int semidx;
|
|
|
|
DPRINTF(("call to semctl(%d, %d, %d, 0x%p)\n",
|
|
semid, semnum, cmd, arg));
|
|
|
|
AUDIT_ARG_SVIPC_CMD(cmd);
|
|
AUDIT_ARG_SVIPC_ID(semid);
|
|
|
|
rpr = sem_find_prison(td->td_ucred);
|
|
if (sem == NULL)
|
|
return (ENOSYS);
|
|
|
|
array = NULL;
|
|
|
|
switch(cmd) {
|
|
case SEM_STAT:
|
|
/*
|
|
* For this command we assume semid is an array index
|
|
* rather than an IPC id.
|
|
*/
|
|
if (semid < 0 || semid >= seminfo.semmni)
|
|
return (EINVAL);
|
|
semakptr = &sema[semid];
|
|
sema_mtxp = &sema_mtx[semid];
|
|
mtx_lock(sema_mtxp);
|
|
if ((semakptr->u.sem_perm.mode & SEM_ALLOC) == 0) {
|
|
error = EINVAL;
|
|
goto done2;
|
|
}
|
|
if ((error = sem_prison_cansee(rpr, semakptr)))
|
|
goto done2;
|
|
if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_R)))
|
|
goto done2;
|
|
#ifdef MAC
|
|
error = mac_sysvsem_check_semctl(cred, semakptr, cmd);
|
|
if (error != 0)
|
|
goto done2;
|
|
#endif
|
|
bcopy(&semakptr->u, arg->buf, sizeof(struct semid_ds));
|
|
if (cred->cr_prison != semakptr->cred->cr_prison)
|
|
arg->buf->sem_perm.key = IPC_PRIVATE;
|
|
*rval = IXSEQ_TO_IPCID(semid, semakptr->u.sem_perm);
|
|
mtx_unlock(sema_mtxp);
|
|
return (0);
|
|
}
|
|
|
|
semidx = IPCID_TO_IX(semid);
|
|
if (semidx < 0 || semidx >= seminfo.semmni)
|
|
return (EINVAL);
|
|
|
|
semakptr = &sema[semidx];
|
|
sema_mtxp = &sema_mtx[semidx];
|
|
if (cmd == IPC_RMID)
|
|
mtx_lock(&sem_mtx);
|
|
mtx_lock(sema_mtxp);
|
|
|
|
#ifdef MAC
|
|
error = mac_sysvsem_check_semctl(cred, semakptr, cmd);
|
|
if (error != 0)
|
|
goto done2;
|
|
#endif
|
|
|
|
error = 0;
|
|
*rval = 0;
|
|
|
|
switch (cmd) {
|
|
case IPC_RMID:
|
|
if ((error = semvalid(semid, rpr, semakptr)) != 0)
|
|
goto done2;
|
|
if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_M)))
|
|
goto done2;
|
|
sem_remove(semidx, cred);
|
|
break;
|
|
|
|
case IPC_SET:
|
|
AUDIT_ARG_SVIPC_PERM(&arg->buf->sem_perm);
|
|
if ((error = semvalid(semid, rpr, semakptr)) != 0)
|
|
goto done2;
|
|
if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_M)))
|
|
goto done2;
|
|
sbuf = arg->buf;
|
|
semakptr->u.sem_perm.uid = sbuf->sem_perm.uid;
|
|
semakptr->u.sem_perm.gid = sbuf->sem_perm.gid;
|
|
semakptr->u.sem_perm.mode = (semakptr->u.sem_perm.mode &
|
|
~0777) | (sbuf->sem_perm.mode & 0777);
|
|
semakptr->u.sem_ctime = time_second;
|
|
break;
|
|
|
|
case IPC_STAT:
|
|
if ((error = semvalid(semid, rpr, semakptr)) != 0)
|
|
goto done2;
|
|
if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_R)))
|
|
goto done2;
|
|
bcopy(&semakptr->u, arg->buf, sizeof(struct semid_ds));
|
|
if (cred->cr_prison != semakptr->cred->cr_prison)
|
|
arg->buf->sem_perm.key = IPC_PRIVATE;
|
|
|
|
/*
|
|
* Try to hide the fact that the structure layout is shared by
|
|
* both the kernel and userland. This pointer is not useful to
|
|
* userspace.
|
|
*/
|
|
arg->buf->__sem_base = NULL;
|
|
break;
|
|
|
|
case GETNCNT:
|
|
if ((error = semvalid(semid, rpr, semakptr)) != 0)
|
|
goto done2;
|
|
if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_R)))
|
|
goto done2;
|
|
if (semnum < 0 || semnum >= semakptr->u.sem_nsems) {
|
|
error = EINVAL;
|
|
goto done2;
|
|
}
|
|
*rval = semakptr->u.__sem_base[semnum].semncnt;
|
|
break;
|
|
|
|
case GETPID:
|
|
if ((error = semvalid(semid, rpr, semakptr)) != 0)
|
|
goto done2;
|
|
if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_R)))
|
|
goto done2;
|
|
if (semnum < 0 || semnum >= semakptr->u.sem_nsems) {
|
|
error = EINVAL;
|
|
goto done2;
|
|
}
|
|
*rval = semakptr->u.__sem_base[semnum].sempid;
|
|
break;
|
|
|
|
case GETVAL:
|
|
if ((error = semvalid(semid, rpr, semakptr)) != 0)
|
|
goto done2;
|
|
if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_R)))
|
|
goto done2;
|
|
if (semnum < 0 || semnum >= semakptr->u.sem_nsems) {
|
|
error = EINVAL;
|
|
goto done2;
|
|
}
|
|
*rval = semakptr->u.__sem_base[semnum].semval;
|
|
break;
|
|
|
|
case GETALL:
|
|
/*
|
|
* Unfortunately, callers of this function don't know
|
|
* in advance how many semaphores are in this set.
|
|
* While we could just allocate the maximum size array
|
|
* and pass the actual size back to the caller, that
|
|
* won't work for SETALL since we can't copyin() more
|
|
* data than the user specified as we may return a
|
|
* spurious EFAULT.
|
|
*
|
|
* Note that the number of semaphores in a set is
|
|
* fixed for the life of that set. The only way that
|
|
* the 'count' could change while are blocked in
|
|
* malloc() is if this semaphore set were destroyed
|
|
* and a new one created with the same index.
|
|
* However, semvalid() will catch that due to the
|
|
* sequence number unless exactly 0x8000 (or a
|
|
* multiple thereof) semaphore sets for the same index
|
|
* are created and destroyed while we are in malloc!
|
|
*
|
|
*/
|
|
count = semakptr->u.sem_nsems;
|
|
mtx_unlock(sema_mtxp);
|
|
array = malloc(sizeof(*array) * count, M_TEMP, M_WAITOK);
|
|
mtx_lock(sema_mtxp);
|
|
if ((error = semvalid(semid, rpr, semakptr)) != 0)
|
|
goto done2;
|
|
KASSERT(count == semakptr->u.sem_nsems, ("nsems changed"));
|
|
if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_R)))
|
|
goto done2;
|
|
for (i = 0; i < semakptr->u.sem_nsems; i++)
|
|
array[i] = semakptr->u.__sem_base[i].semval;
|
|
mtx_unlock(sema_mtxp);
|
|
error = copyout(array, arg->array, count * sizeof(*array));
|
|
mtx_lock(sema_mtxp);
|
|
break;
|
|
|
|
case GETZCNT:
|
|
if ((error = semvalid(semid, rpr, semakptr)) != 0)
|
|
goto done2;
|
|
if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_R)))
|
|
goto done2;
|
|
if (semnum < 0 || semnum >= semakptr->u.sem_nsems) {
|
|
error = EINVAL;
|
|
goto done2;
|
|
}
|
|
*rval = semakptr->u.__sem_base[semnum].semzcnt;
|
|
break;
|
|
|
|
case SETVAL:
|
|
if ((error = semvalid(semid, rpr, semakptr)) != 0)
|
|
goto done2;
|
|
if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_W)))
|
|
goto done2;
|
|
if (semnum < 0 || semnum >= semakptr->u.sem_nsems) {
|
|
error = EINVAL;
|
|
goto done2;
|
|
}
|
|
if (arg->val < 0 || arg->val > seminfo.semvmx) {
|
|
error = ERANGE;
|
|
goto done2;
|
|
}
|
|
semakptr->u.__sem_base[semnum].semval = arg->val;
|
|
SEMUNDO_LOCK();
|
|
semundo_clear(semidx, semnum);
|
|
SEMUNDO_UNLOCK();
|
|
wakeup(semakptr);
|
|
break;
|
|
|
|
case SETALL:
|
|
/*
|
|
* See comment on GETALL for why 'count' shouldn't change
|
|
* and why we require a userland buffer.
|
|
*/
|
|
count = semakptr->u.sem_nsems;
|
|
mtx_unlock(sema_mtxp);
|
|
array = malloc(sizeof(*array) * count, M_TEMP, M_WAITOK);
|
|
error = copyin(arg->array, array, count * sizeof(*array));
|
|
mtx_lock(sema_mtxp);
|
|
if (error)
|
|
break;
|
|
if ((error = semvalid(semid, rpr, semakptr)) != 0)
|
|
goto done2;
|
|
KASSERT(count == semakptr->u.sem_nsems, ("nsems changed"));
|
|
if ((error = ipcperm(td, &semakptr->u.sem_perm, IPC_W)))
|
|
goto done2;
|
|
for (i = 0; i < semakptr->u.sem_nsems; i++) {
|
|
usval = array[i];
|
|
if (usval > seminfo.semvmx) {
|
|
error = ERANGE;
|
|
break;
|
|
}
|
|
semakptr->u.__sem_base[i].semval = usval;
|
|
}
|
|
SEMUNDO_LOCK();
|
|
semundo_clear(semidx, -1);
|
|
SEMUNDO_UNLOCK();
|
|
wakeup(semakptr);
|
|
break;
|
|
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
done2:
|
|
mtx_unlock(sema_mtxp);
|
|
if (cmd == IPC_RMID)
|
|
mtx_unlock(&sem_mtx);
|
|
if (array != NULL)
|
|
free(array, M_TEMP);
|
|
return(error);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct semget_args {
|
|
key_t key;
|
|
int nsems;
|
|
int semflg;
|
|
};
|
|
#endif
|
|
int
|
|
sys_semget(struct thread *td, struct semget_args *uap)
|
|
{
|
|
int semid, error = 0;
|
|
int key = uap->key;
|
|
int nsems = uap->nsems;
|
|
int semflg = uap->semflg;
|
|
struct ucred *cred = td->td_ucred;
|
|
|
|
DPRINTF(("semget(0x%x, %d, 0%o)\n", key, nsems, semflg));
|
|
|
|
AUDIT_ARG_VALUE(semflg);
|
|
|
|
if (sem_find_prison(cred) == NULL)
|
|
return (ENOSYS);
|
|
|
|
mtx_lock(&sem_mtx);
|
|
if (key != IPC_PRIVATE) {
|
|
for (semid = 0; semid < seminfo.semmni; semid++) {
|
|
if ((sema[semid].u.sem_perm.mode & SEM_ALLOC) &&
|
|
sema[semid].cred != NULL &&
|
|
sema[semid].cred->cr_prison == cred->cr_prison &&
|
|
sema[semid].u.sem_perm.key == key)
|
|
break;
|
|
}
|
|
if (semid < seminfo.semmni) {
|
|
AUDIT_ARG_SVIPC_ID(semid);
|
|
DPRINTF(("found public key\n"));
|
|
if ((semflg & IPC_CREAT) && (semflg & IPC_EXCL)) {
|
|
DPRINTF(("not exclusive\n"));
|
|
error = EEXIST;
|
|
goto done2;
|
|
}
|
|
if ((error = ipcperm(td, &sema[semid].u.sem_perm,
|
|
semflg & 0700))) {
|
|
goto done2;
|
|
}
|
|
if (nsems > 0 && sema[semid].u.sem_nsems < nsems) {
|
|
DPRINTF(("too small\n"));
|
|
error = EINVAL;
|
|
goto done2;
|
|
}
|
|
#ifdef MAC
|
|
error = mac_sysvsem_check_semget(cred, &sema[semid]);
|
|
if (error != 0)
|
|
goto done2;
|
|
#endif
|
|
goto found;
|
|
}
|
|
}
|
|
|
|
DPRINTF(("need to allocate the semid_kernel\n"));
|
|
if (key == IPC_PRIVATE || (semflg & IPC_CREAT)) {
|
|
if (nsems <= 0 || nsems > seminfo.semmsl) {
|
|
DPRINTF(("nsems out of range (0<%d<=%d)\n", nsems,
|
|
seminfo.semmsl));
|
|
error = EINVAL;
|
|
goto done2;
|
|
}
|
|
if (nsems > seminfo.semmns - semtot) {
|
|
DPRINTF((
|
|
"not enough semaphores left (need %d, got %d)\n",
|
|
nsems, seminfo.semmns - semtot));
|
|
error = ENOSPC;
|
|
goto done2;
|
|
}
|
|
for (semid = 0; semid < seminfo.semmni; semid++) {
|
|
if ((sema[semid].u.sem_perm.mode & SEM_ALLOC) == 0)
|
|
break;
|
|
}
|
|
if (semid == seminfo.semmni) {
|
|
DPRINTF(("no more semid_kernel's available\n"));
|
|
error = ENOSPC;
|
|
goto done2;
|
|
}
|
|
#ifdef RACCT
|
|
if (racct_enable) {
|
|
PROC_LOCK(td->td_proc);
|
|
error = racct_add(td->td_proc, RACCT_NSEM, nsems);
|
|
PROC_UNLOCK(td->td_proc);
|
|
if (error != 0) {
|
|
error = ENOSPC;
|
|
goto done2;
|
|
}
|
|
}
|
|
#endif
|
|
DPRINTF(("semid %d is available\n", semid));
|
|
mtx_lock(&sema_mtx[semid]);
|
|
KASSERT((sema[semid].u.sem_perm.mode & SEM_ALLOC) == 0,
|
|
("Lost semaphore %d", semid));
|
|
sema[semid].u.sem_perm.key = key;
|
|
sema[semid].u.sem_perm.cuid = cred->cr_uid;
|
|
sema[semid].u.sem_perm.uid = cred->cr_uid;
|
|
sema[semid].u.sem_perm.cgid = cred->cr_gid;
|
|
sema[semid].u.sem_perm.gid = cred->cr_gid;
|
|
sema[semid].u.sem_perm.mode = (semflg & 0777) | SEM_ALLOC;
|
|
sema[semid].cred = crhold(cred);
|
|
sema[semid].u.sem_perm.seq =
|
|
(sema[semid].u.sem_perm.seq + 1) & 0x7fff;
|
|
sema[semid].u.sem_nsems = nsems;
|
|
sema[semid].u.sem_otime = 0;
|
|
sema[semid].u.sem_ctime = time_second;
|
|
sema[semid].u.__sem_base = &sem[semtot];
|
|
semtot += nsems;
|
|
bzero(sema[semid].u.__sem_base,
|
|
sizeof(sema[semid].u.__sem_base[0])*nsems);
|
|
#ifdef MAC
|
|
mac_sysvsem_create(cred, &sema[semid]);
|
|
#endif
|
|
mtx_unlock(&sema_mtx[semid]);
|
|
DPRINTF(("sembase = %p, next = %p\n",
|
|
sema[semid].u.__sem_base, &sem[semtot]));
|
|
} else {
|
|
DPRINTF(("didn't find it and wasn't asked to create it\n"));
|
|
error = ENOENT;
|
|
goto done2;
|
|
}
|
|
|
|
found:
|
|
td->td_retval[0] = IXSEQ_TO_IPCID(semid, sema[semid].u.sem_perm);
|
|
done2:
|
|
mtx_unlock(&sem_mtx);
|
|
return (error);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct semop_args {
|
|
int semid;
|
|
struct sembuf *sops;
|
|
size_t nsops;
|
|
};
|
|
#endif
|
|
int
|
|
sys_semop(struct thread *td, struct semop_args *uap)
|
|
{
|
|
#define SMALL_SOPS 8
|
|
struct sembuf small_sops[SMALL_SOPS];
|
|
int semid = uap->semid;
|
|
size_t nsops = uap->nsops;
|
|
struct prison *rpr;
|
|
struct sembuf *sops;
|
|
struct semid_kernel *semakptr;
|
|
struct sembuf *sopptr = NULL;
|
|
struct sem *semptr = NULL;
|
|
struct sem_undo *suptr;
|
|
struct mtx *sema_mtxp;
|
|
size_t i, j, k;
|
|
int error;
|
|
int do_wakeup, do_undos;
|
|
unsigned short seq;
|
|
|
|
#ifdef SEM_DEBUG
|
|
sops = NULL;
|
|
#endif
|
|
DPRINTF(("call to semop(%d, %p, %u)\n", semid, sops, nsops));
|
|
|
|
AUDIT_ARG_SVIPC_ID(semid);
|
|
|
|
rpr = sem_find_prison(td->td_ucred);
|
|
if (sem == NULL)
|
|
return (ENOSYS);
|
|
|
|
semid = IPCID_TO_IX(semid); /* Convert back to zero origin */
|
|
|
|
if (semid < 0 || semid >= seminfo.semmni)
|
|
return (EINVAL);
|
|
|
|
/* Allocate memory for sem_ops */
|
|
if (nsops <= SMALL_SOPS)
|
|
sops = small_sops;
|
|
else if (nsops > seminfo.semopm) {
|
|
DPRINTF(("too many sops (max=%d, nsops=%d)\n", seminfo.semopm,
|
|
nsops));
|
|
return (E2BIG);
|
|
} else {
|
|
#ifdef RACCT
|
|
if (racct_enable) {
|
|
PROC_LOCK(td->td_proc);
|
|
if (nsops >
|
|
racct_get_available(td->td_proc, RACCT_NSEMOP)) {
|
|
PROC_UNLOCK(td->td_proc);
|
|
return (E2BIG);
|
|
}
|
|
PROC_UNLOCK(td->td_proc);
|
|
}
|
|
#endif
|
|
|
|
sops = malloc(nsops * sizeof(*sops), M_TEMP, M_WAITOK);
|
|
}
|
|
if ((error = copyin(uap->sops, sops, nsops * sizeof(sops[0]))) != 0) {
|
|
DPRINTF(("error = %d from copyin(%p, %p, %d)\n", error,
|
|
uap->sops, sops, nsops * sizeof(sops[0])));
|
|
if (sops != small_sops)
|
|
free(sops, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
semakptr = &sema[semid];
|
|
sema_mtxp = &sema_mtx[semid];
|
|
mtx_lock(sema_mtxp);
|
|
if ((semakptr->u.sem_perm.mode & SEM_ALLOC) == 0) {
|
|
error = EINVAL;
|
|
goto done2;
|
|
}
|
|
seq = semakptr->u.sem_perm.seq;
|
|
if (seq != IPCID_TO_SEQ(uap->semid)) {
|
|
error = EINVAL;
|
|
goto done2;
|
|
}
|
|
if ((error = sem_prison_cansee(rpr, semakptr)) != 0)
|
|
goto done2;
|
|
/*
|
|
* Initial pass through sops to see what permissions are needed.
|
|
* Also perform any checks that don't need repeating on each
|
|
* attempt to satisfy the request vector.
|
|
*/
|
|
j = 0; /* permission needed */
|
|
do_undos = 0;
|
|
for (i = 0; i < nsops; i++) {
|
|
sopptr = &sops[i];
|
|
if (sopptr->sem_num >= semakptr->u.sem_nsems) {
|
|
error = EFBIG;
|
|
goto done2;
|
|
}
|
|
if (sopptr->sem_flg & SEM_UNDO && sopptr->sem_op != 0)
|
|
do_undos = 1;
|
|
j |= (sopptr->sem_op == 0) ? SEM_R : SEM_A;
|
|
}
|
|
|
|
if ((error = ipcperm(td, &semakptr->u.sem_perm, j))) {
|
|
DPRINTF(("error = %d from ipaccess\n", error));
|
|
goto done2;
|
|
}
|
|
#ifdef MAC
|
|
error = mac_sysvsem_check_semop(td->td_ucred, semakptr, j);
|
|
if (error != 0)
|
|
goto done2;
|
|
#endif
|
|
|
|
/*
|
|
* Loop trying to satisfy the vector of requests.
|
|
* If we reach a point where we must wait, any requests already
|
|
* performed are rolled back and we go to sleep until some other
|
|
* process wakes us up. At this point, we start all over again.
|
|
*
|
|
* This ensures that from the perspective of other tasks, a set
|
|
* of requests is atomic (never partially satisfied).
|
|
*/
|
|
for (;;) {
|
|
do_wakeup = 0;
|
|
error = 0; /* error return if necessary */
|
|
|
|
for (i = 0; i < nsops; i++) {
|
|
sopptr = &sops[i];
|
|
semptr = &semakptr->u.__sem_base[sopptr->sem_num];
|
|
|
|
DPRINTF((
|
|
"semop: semakptr=%p, __sem_base=%p, "
|
|
"semptr=%p, sem[%d]=%d : op=%d, flag=%s\n",
|
|
semakptr, semakptr->u.__sem_base, semptr,
|
|
sopptr->sem_num, semptr->semval, sopptr->sem_op,
|
|
(sopptr->sem_flg & IPC_NOWAIT) ?
|
|
"nowait" : "wait"));
|
|
|
|
if (sopptr->sem_op < 0) {
|
|
if (semptr->semval + sopptr->sem_op < 0) {
|
|
DPRINTF(("semop: can't do it now\n"));
|
|
break;
|
|
} else {
|
|
semptr->semval += sopptr->sem_op;
|
|
if (semptr->semval == 0 &&
|
|
semptr->semzcnt > 0)
|
|
do_wakeup = 1;
|
|
}
|
|
} else if (sopptr->sem_op == 0) {
|
|
if (semptr->semval != 0) {
|
|
DPRINTF(("semop: not zero now\n"));
|
|
break;
|
|
}
|
|
} else if (semptr->semval + sopptr->sem_op >
|
|
seminfo.semvmx) {
|
|
error = ERANGE;
|
|
break;
|
|
} else {
|
|
if (semptr->semncnt > 0)
|
|
do_wakeup = 1;
|
|
semptr->semval += sopptr->sem_op;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Did we get through the entire vector?
|
|
*/
|
|
if (i >= nsops)
|
|
goto done;
|
|
|
|
/*
|
|
* No ... rollback anything that we've already done
|
|
*/
|
|
DPRINTF(("semop: rollback 0 through %d\n", i-1));
|
|
for (j = 0; j < i; j++)
|
|
semakptr->u.__sem_base[sops[j].sem_num].semval -=
|
|
sops[j].sem_op;
|
|
|
|
/* If we detected an error, return it */
|
|
if (error != 0)
|
|
goto done2;
|
|
|
|
/*
|
|
* If the request that we couldn't satisfy has the
|
|
* NOWAIT flag set then return with EAGAIN.
|
|
*/
|
|
if (sopptr->sem_flg & IPC_NOWAIT) {
|
|
error = EAGAIN;
|
|
goto done2;
|
|
}
|
|
|
|
if (sopptr->sem_op == 0)
|
|
semptr->semzcnt++;
|
|
else
|
|
semptr->semncnt++;
|
|
|
|
DPRINTF(("semop: good night!\n"));
|
|
error = msleep(semakptr, sema_mtxp, (PZERO - 4) | PCATCH,
|
|
"semwait", 0);
|
|
DPRINTF(("semop: good morning (error=%d)!\n", error));
|
|
/* return code is checked below, after sem[nz]cnt-- */
|
|
|
|
/*
|
|
* Make sure that the semaphore still exists
|
|
*/
|
|
seq = semakptr->u.sem_perm.seq;
|
|
if ((semakptr->u.sem_perm.mode & SEM_ALLOC) == 0 ||
|
|
seq != IPCID_TO_SEQ(uap->semid)) {
|
|
error = EIDRM;
|
|
goto done2;
|
|
}
|
|
|
|
/*
|
|
* Renew the semaphore's pointer after wakeup since
|
|
* during msleep __sem_base may have been modified and semptr
|
|
* is not valid any more
|
|
*/
|
|
semptr = &semakptr->u.__sem_base[sopptr->sem_num];
|
|
|
|
/*
|
|
* The semaphore is still alive. Readjust the count of
|
|
* waiting processes.
|
|
*/
|
|
if (sopptr->sem_op == 0)
|
|
semptr->semzcnt--;
|
|
else
|
|
semptr->semncnt--;
|
|
|
|
/*
|
|
* Is it really morning, or was our sleep interrupted?
|
|
* (Delayed check of msleep() return code because we
|
|
* need to decrement sem[nz]cnt either way.)
|
|
*/
|
|
if (error != 0) {
|
|
error = EINTR;
|
|
goto done2;
|
|
}
|
|
DPRINTF(("semop: good morning!\n"));
|
|
}
|
|
|
|
done:
|
|
/*
|
|
* Process any SEM_UNDO requests.
|
|
*/
|
|
if (do_undos) {
|
|
SEMUNDO_LOCK();
|
|
suptr = NULL;
|
|
for (i = 0; i < nsops; i++) {
|
|
/*
|
|
* We only need to deal with SEM_UNDO's for non-zero
|
|
* op's.
|
|
*/
|
|
int adjval;
|
|
|
|
if ((sops[i].sem_flg & SEM_UNDO) == 0)
|
|
continue;
|
|
adjval = sops[i].sem_op;
|
|
if (adjval == 0)
|
|
continue;
|
|
error = semundo_adjust(td, &suptr, semid, seq,
|
|
sops[i].sem_num, -adjval);
|
|
if (error == 0)
|
|
continue;
|
|
|
|
/*
|
|
* Oh-Oh! We ran out of either sem_undo's or undo's.
|
|
* Rollback the adjustments to this point and then
|
|
* rollback the semaphore ups and down so we can return
|
|
* with an error with all structures restored. We
|
|
* rollback the undo's in the exact reverse order that
|
|
* we applied them. This guarantees that we won't run
|
|
* out of space as we roll things back out.
|
|
*/
|
|
for (j = 0; j < i; j++) {
|
|
k = i - j - 1;
|
|
if ((sops[k].sem_flg & SEM_UNDO) == 0)
|
|
continue;
|
|
adjval = sops[k].sem_op;
|
|
if (adjval == 0)
|
|
continue;
|
|
if (semundo_adjust(td, &suptr, semid, seq,
|
|
sops[k].sem_num, adjval) != 0)
|
|
panic("semop - can't undo undos");
|
|
}
|
|
|
|
for (j = 0; j < nsops; j++)
|
|
semakptr->u.__sem_base[sops[j].sem_num].semval -=
|
|
sops[j].sem_op;
|
|
|
|
DPRINTF(("error = %d from semundo_adjust\n", error));
|
|
SEMUNDO_UNLOCK();
|
|
goto done2;
|
|
} /* loop through the sops */
|
|
SEMUNDO_UNLOCK();
|
|
} /* if (do_undos) */
|
|
|
|
/* We're definitely done - set the sempid's and time */
|
|
for (i = 0; i < nsops; i++) {
|
|
sopptr = &sops[i];
|
|
semptr = &semakptr->u.__sem_base[sopptr->sem_num];
|
|
semptr->sempid = td->td_proc->p_pid;
|
|
}
|
|
semakptr->u.sem_otime = time_second;
|
|
|
|
/*
|
|
* Do a wakeup if any semaphore was up'd whilst something was
|
|
* sleeping on it.
|
|
*/
|
|
if (do_wakeup) {
|
|
DPRINTF(("semop: doing wakeup\n"));
|
|
wakeup(semakptr);
|
|
DPRINTF(("semop: back from wakeup\n"));
|
|
}
|
|
DPRINTF(("semop: done\n"));
|
|
td->td_retval[0] = 0;
|
|
done2:
|
|
mtx_unlock(sema_mtxp);
|
|
if (sops != small_sops)
|
|
free(sops, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Go through the undo structures for this process and apply the adjustments to
|
|
* semaphores.
|
|
*/
|
|
static void
|
|
semexit_myhook(void *arg, struct proc *p)
|
|
{
|
|
struct sem_undo *suptr;
|
|
struct semid_kernel *semakptr;
|
|
struct mtx *sema_mtxp;
|
|
int semid, semnum, adjval, ix;
|
|
unsigned short seq;
|
|
|
|
/*
|
|
* Go through the chain of undo vectors looking for one
|
|
* associated with this process.
|
|
*/
|
|
if (LIST_EMPTY(&semu_list))
|
|
return;
|
|
SEMUNDO_LOCK();
|
|
LIST_FOREACH(suptr, &semu_list, un_next) {
|
|
if (suptr->un_proc == p)
|
|
break;
|
|
}
|
|
if (suptr == NULL) {
|
|
SEMUNDO_UNLOCK();
|
|
return;
|
|
}
|
|
LIST_REMOVE(suptr, un_next);
|
|
|
|
DPRINTF(("proc @%p has undo structure with %d entries\n", p,
|
|
suptr->un_cnt));
|
|
|
|
/*
|
|
* If there are any active undo elements then process them.
|
|
*/
|
|
if (suptr->un_cnt > 0) {
|
|
SEMUNDO_UNLOCK();
|
|
for (ix = 0; ix < suptr->un_cnt; ix++) {
|
|
semid = suptr->un_ent[ix].un_id;
|
|
semnum = suptr->un_ent[ix].un_num;
|
|
adjval = suptr->un_ent[ix].un_adjval;
|
|
seq = suptr->un_ent[ix].un_seq;
|
|
semakptr = &sema[semid];
|
|
sema_mtxp = &sema_mtx[semid];
|
|
|
|
mtx_lock(sema_mtxp);
|
|
if ((semakptr->u.sem_perm.mode & SEM_ALLOC) == 0 ||
|
|
(semakptr->u.sem_perm.seq != seq)) {
|
|
mtx_unlock(sema_mtxp);
|
|
continue;
|
|
}
|
|
if (semnum >= semakptr->u.sem_nsems)
|
|
panic("semexit - semnum out of range");
|
|
|
|
DPRINTF((
|
|
"semexit: %p id=%d num=%d(adj=%d) ; sem=%d\n",
|
|
suptr->un_proc, suptr->un_ent[ix].un_id,
|
|
suptr->un_ent[ix].un_num,
|
|
suptr->un_ent[ix].un_adjval,
|
|
semakptr->u.__sem_base[semnum].semval));
|
|
|
|
if (adjval < 0 && semakptr->u.__sem_base[semnum].semval <
|
|
-adjval)
|
|
semakptr->u.__sem_base[semnum].semval = 0;
|
|
else
|
|
semakptr->u.__sem_base[semnum].semval += adjval;
|
|
|
|
wakeup(semakptr);
|
|
DPRINTF(("semexit: back from wakeup\n"));
|
|
mtx_unlock(sema_mtxp);
|
|
}
|
|
SEMUNDO_LOCK();
|
|
}
|
|
|
|
/*
|
|
* Deallocate the undo vector.
|
|
*/
|
|
DPRINTF(("removing vector\n"));
|
|
suptr->un_proc = NULL;
|
|
suptr->un_cnt = 0;
|
|
LIST_INSERT_HEAD(&semu_free_list, suptr, un_next);
|
|
SEMUNDO_UNLOCK();
|
|
}
|
|
|
|
static int
|
|
sysctl_sema(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct prison *pr, *rpr;
|
|
struct semid_kernel tsemak;
|
|
#ifdef COMPAT_FREEBSD32
|
|
struct semid_kernel32 tsemak32;
|
|
#endif
|
|
void *outaddr;
|
|
size_t outsize;
|
|
int error, i;
|
|
|
|
pr = req->td->td_ucred->cr_prison;
|
|
rpr = sem_find_prison(req->td->td_ucred);
|
|
error = 0;
|
|
for (i = 0; i < seminfo.semmni; i++) {
|
|
mtx_lock(&sema_mtx[i]);
|
|
if ((sema[i].u.sem_perm.mode & SEM_ALLOC) == 0 ||
|
|
rpr == NULL || sem_prison_cansee(rpr, &sema[i]) != 0)
|
|
bzero(&tsemak, sizeof(tsemak));
|
|
else {
|
|
tsemak = sema[i];
|
|
if (tsemak.cred->cr_prison != pr)
|
|
tsemak.u.sem_perm.key = IPC_PRIVATE;
|
|
}
|
|
mtx_unlock(&sema_mtx[i]);
|
|
#ifdef COMPAT_FREEBSD32
|
|
if (SV_CURPROC_FLAG(SV_ILP32)) {
|
|
bzero(&tsemak32, sizeof(tsemak32));
|
|
freebsd32_ipcperm_out(&tsemak.u.sem_perm,
|
|
&tsemak32.u.sem_perm);
|
|
/* Don't copy u.__sem_base */
|
|
CP(tsemak, tsemak32, u.sem_nsems);
|
|
CP(tsemak, tsemak32, u.sem_otime);
|
|
CP(tsemak, tsemak32, u.sem_ctime);
|
|
/* Don't copy label or cred */
|
|
outaddr = &tsemak32;
|
|
outsize = sizeof(tsemak32);
|
|
} else
|
|
#endif
|
|
{
|
|
tsemak.u.__sem_base = NULL;
|
|
tsemak.label = NULL;
|
|
tsemak.cred = NULL;
|
|
outaddr = &tsemak;
|
|
outsize = sizeof(tsemak);
|
|
}
|
|
error = SYSCTL_OUT(req, outaddr, outsize);
|
|
if (error != 0)
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
sem_prison_check(void *obj, void *data)
|
|
{
|
|
struct prison *pr = obj;
|
|
struct prison *prpr;
|
|
struct vfsoptlist *opts = data;
|
|
int error, jsys;
|
|
|
|
/*
|
|
* sysvsem is a jailsys integer.
|
|
* It must be "disable" if the parent jail is disabled.
|
|
*/
|
|
error = vfs_copyopt(opts, "sysvsem", &jsys, sizeof(jsys));
|
|
if (error != ENOENT) {
|
|
if (error != 0)
|
|
return (error);
|
|
switch (jsys) {
|
|
case JAIL_SYS_DISABLE:
|
|
break;
|
|
case JAIL_SYS_NEW:
|
|
case JAIL_SYS_INHERIT:
|
|
prison_lock(pr->pr_parent);
|
|
prpr = osd_jail_get(pr->pr_parent, sem_prison_slot);
|
|
prison_unlock(pr->pr_parent);
|
|
if (prpr == NULL)
|
|
return (EPERM);
|
|
break;
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
sem_prison_set(void *obj, void *data)
|
|
{
|
|
struct prison *pr = obj;
|
|
struct prison *tpr, *orpr, *nrpr, *trpr;
|
|
struct vfsoptlist *opts = data;
|
|
void *rsv;
|
|
int jsys, descend;
|
|
|
|
/*
|
|
* sysvsem controls which jail is the root of the associated sems (this
|
|
* jail or same as the parent), or if the feature is available at all.
|
|
*/
|
|
if (vfs_copyopt(opts, "sysvsem", &jsys, sizeof(jsys)) == ENOENT)
|
|
jsys = vfs_flagopt(opts, "allow.sysvipc", NULL, 0)
|
|
? JAIL_SYS_INHERIT
|
|
: vfs_flagopt(opts, "allow.nosysvipc", NULL, 0)
|
|
? JAIL_SYS_DISABLE
|
|
: -1;
|
|
if (jsys == JAIL_SYS_DISABLE) {
|
|
prison_lock(pr);
|
|
orpr = osd_jail_get(pr, sem_prison_slot);
|
|
if (orpr != NULL)
|
|
osd_jail_del(pr, sem_prison_slot);
|
|
prison_unlock(pr);
|
|
if (orpr != NULL) {
|
|
if (orpr == pr)
|
|
sem_prison_cleanup(pr);
|
|
/* Disable all child jails as well. */
|
|
FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
|
|
prison_lock(tpr);
|
|
trpr = osd_jail_get(tpr, sem_prison_slot);
|
|
if (trpr != NULL) {
|
|
osd_jail_del(tpr, sem_prison_slot);
|
|
prison_unlock(tpr);
|
|
if (trpr == tpr)
|
|
sem_prison_cleanup(tpr);
|
|
} else {
|
|
prison_unlock(tpr);
|
|
descend = 0;
|
|
}
|
|
}
|
|
}
|
|
} else if (jsys != -1) {
|
|
if (jsys == JAIL_SYS_NEW)
|
|
nrpr = pr;
|
|
else {
|
|
prison_lock(pr->pr_parent);
|
|
nrpr = osd_jail_get(pr->pr_parent, sem_prison_slot);
|
|
prison_unlock(pr->pr_parent);
|
|
}
|
|
rsv = osd_reserve(sem_prison_slot);
|
|
prison_lock(pr);
|
|
orpr = osd_jail_get(pr, sem_prison_slot);
|
|
if (orpr != nrpr)
|
|
(void)osd_jail_set_reserved(pr, sem_prison_slot, rsv,
|
|
nrpr);
|
|
else
|
|
osd_free_reserved(rsv);
|
|
prison_unlock(pr);
|
|
if (orpr != nrpr) {
|
|
if (orpr == pr)
|
|
sem_prison_cleanup(pr);
|
|
if (orpr != NULL) {
|
|
/* Change child jails matching the old root, */
|
|
FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
|
|
prison_lock(tpr);
|
|
trpr = osd_jail_get(tpr,
|
|
sem_prison_slot);
|
|
if (trpr == orpr) {
|
|
(void)osd_jail_set(tpr,
|
|
sem_prison_slot, nrpr);
|
|
prison_unlock(tpr);
|
|
if (trpr == tpr)
|
|
sem_prison_cleanup(tpr);
|
|
} else {
|
|
prison_unlock(tpr);
|
|
descend = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
sem_prison_get(void *obj, void *data)
|
|
{
|
|
struct prison *pr = obj;
|
|
struct prison *rpr;
|
|
struct vfsoptlist *opts = data;
|
|
int error, jsys;
|
|
|
|
/* Set sysvsem based on the jail's root prison. */
|
|
prison_lock(pr);
|
|
rpr = osd_jail_get(pr, sem_prison_slot);
|
|
prison_unlock(pr);
|
|
jsys = rpr == NULL ? JAIL_SYS_DISABLE
|
|
: rpr == pr ? JAIL_SYS_NEW : JAIL_SYS_INHERIT;
|
|
error = vfs_setopt(opts, "sysvsem", &jsys, sizeof(jsys));
|
|
if (error == ENOENT)
|
|
error = 0;
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
sem_prison_remove(void *obj, void *data __unused)
|
|
{
|
|
struct prison *pr = obj;
|
|
struct prison *rpr;
|
|
|
|
prison_lock(pr);
|
|
rpr = osd_jail_get(pr, sem_prison_slot);
|
|
prison_unlock(pr);
|
|
if (rpr == pr)
|
|
sem_prison_cleanup(pr);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
sem_prison_cleanup(struct prison *pr)
|
|
{
|
|
int i;
|
|
|
|
/* Remove any sems that belong to this jail. */
|
|
mtx_lock(&sem_mtx);
|
|
for (i = 0; i < seminfo.semmni; i++) {
|
|
if ((sema[i].u.sem_perm.mode & SEM_ALLOC) &&
|
|
sema[i].cred != NULL && sema[i].cred->cr_prison == pr) {
|
|
mtx_lock(&sema_mtx[i]);
|
|
sem_remove(i, NULL);
|
|
mtx_unlock(&sema_mtx[i]);
|
|
}
|
|
}
|
|
mtx_unlock(&sem_mtx);
|
|
}
|
|
|
|
SYSCTL_JAIL_PARAM_SYS_NODE(sysvsem, CTLFLAG_RW, "SYSV semaphores");
|
|
|
|
#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
|
|
defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
|
|
|
|
/* XXX casting to (sy_call_t *) is bogus, as usual. */
|
|
static sy_call_t *semcalls[] = {
|
|
(sy_call_t *)freebsd7___semctl, (sy_call_t *)sys_semget,
|
|
(sy_call_t *)sys_semop
|
|
};
|
|
|
|
/*
|
|
* Entry point for all SEM calls.
|
|
*/
|
|
int
|
|
sys_semsys(td, uap)
|
|
struct thread *td;
|
|
/* XXX actually varargs. */
|
|
struct semsys_args /* {
|
|
int which;
|
|
int a2;
|
|
int a3;
|
|
int a4;
|
|
int a5;
|
|
} */ *uap;
|
|
{
|
|
int error;
|
|
|
|
AUDIT_ARG_SVIPC_WHICH(uap->which);
|
|
if (uap->which < 0 || uap->which >= nitems(semcalls))
|
|
return (EINVAL);
|
|
error = (*semcalls[uap->which])(td, &uap->a2);
|
|
return (error);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct freebsd7___semctl_args {
|
|
int semid;
|
|
int semnum;
|
|
int cmd;
|
|
union semun_old *arg;
|
|
};
|
|
#endif
|
|
int
|
|
freebsd7___semctl(struct thread *td, struct freebsd7___semctl_args *uap)
|
|
{
|
|
struct semid_ds_old dsold;
|
|
struct semid_ds dsbuf;
|
|
union semun_old arg;
|
|
union semun semun;
|
|
register_t rval;
|
|
int error;
|
|
|
|
switch (uap->cmd) {
|
|
case SEM_STAT:
|
|
case IPC_SET:
|
|
case IPC_STAT:
|
|
case GETALL:
|
|
case SETVAL:
|
|
case SETALL:
|
|
error = copyin(uap->arg, &arg, sizeof(arg));
|
|
if (error)
|
|
return (error);
|
|
break;
|
|
}
|
|
|
|
switch (uap->cmd) {
|
|
case SEM_STAT:
|
|
case IPC_STAT:
|
|
semun.buf = &dsbuf;
|
|
break;
|
|
case IPC_SET:
|
|
error = copyin(arg.buf, &dsold, sizeof(dsold));
|
|
if (error)
|
|
return (error);
|
|
ipcperm_old2new(&dsold.sem_perm, &dsbuf.sem_perm);
|
|
CP(dsold, dsbuf, __sem_base);
|
|
CP(dsold, dsbuf, sem_nsems);
|
|
CP(dsold, dsbuf, sem_otime);
|
|
CP(dsold, dsbuf, sem_ctime);
|
|
semun.buf = &dsbuf;
|
|
break;
|
|
case GETALL:
|
|
case SETALL:
|
|
semun.array = arg.array;
|
|
break;
|
|
case SETVAL:
|
|
semun.val = arg.val;
|
|
break;
|
|
}
|
|
|
|
error = kern_semctl(td, uap->semid, uap->semnum, uap->cmd, &semun,
|
|
&rval);
|
|
if (error)
|
|
return (error);
|
|
|
|
switch (uap->cmd) {
|
|
case SEM_STAT:
|
|
case IPC_STAT:
|
|
bzero(&dsold, sizeof(dsold));
|
|
ipcperm_new2old(&dsbuf.sem_perm, &dsold.sem_perm);
|
|
CP(dsbuf, dsold, __sem_base);
|
|
CP(dsbuf, dsold, sem_nsems);
|
|
CP(dsbuf, dsold, sem_otime);
|
|
CP(dsbuf, dsold, sem_ctime);
|
|
error = copyout(&dsold, arg.buf, sizeof(dsold));
|
|
break;
|
|
}
|
|
|
|
if (error == 0)
|
|
td->td_retval[0] = rval;
|
|
return (error);
|
|
}
|
|
|
|
#endif /* COMPAT_FREEBSD{4,5,6,7} */
|
|
|
|
#ifdef COMPAT_FREEBSD32
|
|
|
|
int
|
|
freebsd32_semsys(struct thread *td, struct freebsd32_semsys_args *uap)
|
|
{
|
|
|
|
#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
|
|
defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
|
|
AUDIT_ARG_SVIPC_WHICH(uap->which);
|
|
switch (uap->which) {
|
|
case 0:
|
|
return (freebsd7_freebsd32_semctl(td,
|
|
(struct freebsd7_freebsd32_semctl_args *)&uap->a2));
|
|
default:
|
|
return (sys_semsys(td, (struct semsys_args *)uap));
|
|
}
|
|
#else
|
|
return (nosys(td, NULL));
|
|
#endif
|
|
}
|
|
|
|
#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
|
|
defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
|
|
int
|
|
freebsd7_freebsd32_semctl(struct thread *td,
|
|
struct freebsd7_freebsd32_semctl_args *uap)
|
|
{
|
|
struct semid_ds32_old dsbuf32;
|
|
struct semid_ds dsbuf;
|
|
union semun semun;
|
|
union semun32 arg;
|
|
register_t rval;
|
|
int error;
|
|
|
|
switch (uap->cmd) {
|
|
case SEM_STAT:
|
|
case IPC_SET:
|
|
case IPC_STAT:
|
|
case GETALL:
|
|
case SETVAL:
|
|
case SETALL:
|
|
error = copyin(uap->arg, &arg, sizeof(arg));
|
|
if (error)
|
|
return (error);
|
|
break;
|
|
}
|
|
|
|
switch (uap->cmd) {
|
|
case SEM_STAT:
|
|
case IPC_STAT:
|
|
semun.buf = &dsbuf;
|
|
break;
|
|
case IPC_SET:
|
|
error = copyin(PTRIN(arg.buf), &dsbuf32, sizeof(dsbuf32));
|
|
if (error)
|
|
return (error);
|
|
freebsd32_ipcperm_old_in(&dsbuf32.sem_perm, &dsbuf.sem_perm);
|
|
PTRIN_CP(dsbuf32, dsbuf, __sem_base);
|
|
CP(dsbuf32, dsbuf, sem_nsems);
|
|
CP(dsbuf32, dsbuf, sem_otime);
|
|
CP(dsbuf32, dsbuf, sem_ctime);
|
|
semun.buf = &dsbuf;
|
|
break;
|
|
case GETALL:
|
|
case SETALL:
|
|
semun.array = PTRIN(arg.array);
|
|
break;
|
|
case SETVAL:
|
|
semun.val = arg.val;
|
|
break;
|
|
}
|
|
|
|
error = kern_semctl(td, uap->semid, uap->semnum, uap->cmd, &semun,
|
|
&rval);
|
|
if (error)
|
|
return (error);
|
|
|
|
switch (uap->cmd) {
|
|
case SEM_STAT:
|
|
case IPC_STAT:
|
|
bzero(&dsbuf32, sizeof(dsbuf32));
|
|
freebsd32_ipcperm_old_out(&dsbuf.sem_perm, &dsbuf32.sem_perm);
|
|
PTROUT_CP(dsbuf, dsbuf32, __sem_base);
|
|
CP(dsbuf, dsbuf32, sem_nsems);
|
|
CP(dsbuf, dsbuf32, sem_otime);
|
|
CP(dsbuf, dsbuf32, sem_ctime);
|
|
error = copyout(&dsbuf32, PTRIN(arg.buf), sizeof(dsbuf32));
|
|
break;
|
|
}
|
|
|
|
if (error == 0)
|
|
td->td_retval[0] = rval;
|
|
return (error);
|
|
}
|
|
#endif
|
|
|
|
int
|
|
freebsd32_semctl(struct thread *td, struct freebsd32_semctl_args *uap)
|
|
{
|
|
struct semid_ds32 dsbuf32;
|
|
struct semid_ds dsbuf;
|
|
union semun semun;
|
|
union semun32 arg;
|
|
register_t rval;
|
|
int error;
|
|
|
|
switch (uap->cmd) {
|
|
case SEM_STAT:
|
|
case IPC_SET:
|
|
case IPC_STAT:
|
|
case GETALL:
|
|
case SETVAL:
|
|
case SETALL:
|
|
error = copyin(uap->arg, &arg, sizeof(arg));
|
|
if (error)
|
|
return (error);
|
|
break;
|
|
}
|
|
|
|
switch (uap->cmd) {
|
|
case SEM_STAT:
|
|
case IPC_STAT:
|
|
semun.buf = &dsbuf;
|
|
break;
|
|
case IPC_SET:
|
|
error = copyin(PTRIN(arg.buf), &dsbuf32, sizeof(dsbuf32));
|
|
if (error)
|
|
return (error);
|
|
freebsd32_ipcperm_in(&dsbuf32.sem_perm, &dsbuf.sem_perm);
|
|
PTRIN_CP(dsbuf32, dsbuf, __sem_base);
|
|
CP(dsbuf32, dsbuf, sem_nsems);
|
|
CP(dsbuf32, dsbuf, sem_otime);
|
|
CP(dsbuf32, dsbuf, sem_ctime);
|
|
semun.buf = &dsbuf;
|
|
break;
|
|
case GETALL:
|
|
case SETALL:
|
|
semun.array = PTRIN(arg.array);
|
|
break;
|
|
case SETVAL:
|
|
semun.val = arg.val;
|
|
break;
|
|
}
|
|
|
|
error = kern_semctl(td, uap->semid, uap->semnum, uap->cmd, &semun,
|
|
&rval);
|
|
if (error)
|
|
return (error);
|
|
|
|
switch (uap->cmd) {
|
|
case SEM_STAT:
|
|
case IPC_STAT:
|
|
bzero(&dsbuf32, sizeof(dsbuf32));
|
|
freebsd32_ipcperm_out(&dsbuf.sem_perm, &dsbuf32.sem_perm);
|
|
PTROUT_CP(dsbuf, dsbuf32, __sem_base);
|
|
CP(dsbuf, dsbuf32, sem_nsems);
|
|
CP(dsbuf, dsbuf32, sem_otime);
|
|
CP(dsbuf, dsbuf32, sem_ctime);
|
|
error = copyout(&dsbuf32, PTRIN(arg.buf), sizeof(dsbuf32));
|
|
break;
|
|
}
|
|
|
|
if (error == 0)
|
|
td->td_retval[0] = rval;
|
|
return (error);
|
|
}
|
|
|
|
#endif /* COMPAT_FREEBSD32 */
|