FreeBSD/Linux Kernel Cross Reference
sys/security/mac/mac_sysv_sem.c

     /*-
      * Copyright (c) 2003-2004 Networks Associates Technology, Inc.
      * All rights reserved.
      *
      * This software was developed for the FreeBSD Project in part by Network
      * Associates Laboratories, the Security Research Division of Network
      * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
      * as part of the DARPA CHATS research program.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/6.2/sys/security/mac/mac_sysv_sem.c 147091 2005-06-07 05:03:28Z rwatson $");
    
    #include "opt_mac.h"
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/lock.h>
    #include <sys/malloc.h>
    #include <sys/mutex.h>
    #include <sys/mac.h>
    #include <sys/sbuf.h>
    #include <sys/systm.h>
    #include <sys/vnode.h>
    #include <sys/mount.h>
    #include <sys/file.h>
    #include <sys/namei.h>
    #include <sys/sysctl.h>
    #include <sys/sem.h>
    
    #include <sys/mac_policy.h>
    
    #include <security/mac/mac_internal.h>
    
    static int      mac_enforce_sysv_sem = 1;
    SYSCTL_INT(_security_mac, OID_AUTO, enforce_sysv_sem, CTLFLAG_RW,
        &mac_enforce_sysv_sem, 0, "Enforce MAC policy on System V IPC Semaphores");
    TUNABLE_INT("security.mac.enforce_sysv", &mac_enforce_sysv_sem);
    
    #ifdef MAC_DEBUG
    static unsigned int nmacipcsemas;
    SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipc_semas, CTLFLAG_RD,
        &nmacipcsemas, 0, "number of sysv ipc semaphore identifiers inuse");
    #endif
    
    static struct label *
    mac_sysv_sem_label_alloc(void)
    {
            struct label *label;
    
            label = mac_labelzone_alloc(M_WAITOK);
            MAC_PERFORM(init_sysv_sem_label, label);
            MAC_DEBUG_COUNTER_INC(&nmacipcsemas);
            return (label);
    }
    
    void
    mac_init_sysv_sem(struct semid_kernel *semakptr)
    {
    
            semakptr->label = mac_sysv_sem_label_alloc();
    }
    
    static void
    mac_sysv_sem_label_free(struct label *label)
    {
    
            MAC_PERFORM(destroy_sysv_sem_label, label);
            mac_labelzone_free(label);
            MAC_DEBUG_COUNTER_DEC(&nmacipcsemas);
    }
    
    void
    mac_destroy_sysv_sem(struct semid_kernel *semakptr)
    {
    
            mac_sysv_sem_label_free(semakptr->label);
            semakptr->label = NULL;
   }
   
   void
   mac_create_sysv_sem(struct ucred *cred, struct semid_kernel *semakptr)
   {
   
           MAC_PERFORM(create_sysv_sem, cred, semakptr, semakptr->label);
   }
   
   void
   mac_cleanup_sysv_sem(struct semid_kernel *semakptr)
   {
   
           MAC_PERFORM(cleanup_sysv_sem, semakptr->label);
   }
   
   int
   mac_check_sysv_semctl(struct ucred *cred, struct semid_kernel *semakptr,
       int cmd)
   {
           int error;
   
           if (!mac_enforce_sysv_sem)
                   return (0);
   
           MAC_CHECK(check_sysv_semctl, cred, semakptr, semakptr->label, cmd);
   
           return(error);
   }
   
   int
   mac_check_sysv_semget(struct ucred *cred, struct semid_kernel *semakptr)
   {
           int error;
   
           if (!mac_enforce_sysv_sem)
                   return (0);
   
           MAC_CHECK(check_sysv_semget, cred, semakptr, semakptr->label);
   
           return(error);
   }
   
   int
   mac_check_sysv_semop(struct ucred *cred, struct semid_kernel *semakptr,
       size_t accesstype)
   {
           int error;
   
           if (!mac_enforce_sysv_sem)
                   return (0);
   
           MAC_CHECK(check_sysv_semop, cred, semakptr, semakptr->label,
               accesstype);
   
           return(error);
   }

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