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

     /*-
      * Copyright (c) 2003-2005 SPARTA, 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("$FreeBSD$");
    
    #include "opt_mac.h"
    #include "opt_posix.h"
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/mac.h>
    #include <sys/module.h>
    #include <sys/systm.h>
    #include <sys/sysctl.h>
    
    #include <posix4/ksem.h>
    
    #include <sys/mac_policy.h>
    
    #include <security/mac/mac_internal.h>
    
    static int      mac_enforce_posix_sem = 1;
    SYSCTL_INT(_security_mac, OID_AUTO, enforce_posix_sem, CTLFLAG_RW,
        &mac_enforce_posix_sem, 0, "Enforce MAC policy on global POSIX semaphores");
    TUNABLE_INT("security.mac.enforce_posix_sem", &mac_enforce_posix_sem);
    
    #ifdef MAC_DEBUG
    static unsigned int nmacposixsems;
    SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, posix_sems, CTLFLAG_RD,
        &nmacposixsems, 0, "number of posix global semaphores inuse");
    #endif
    
    static struct label *
    mac_posix_sem_label_alloc(void)
    {
            struct label *label;
    
            label = mac_labelzone_alloc(M_WAITOK);
            MAC_PERFORM(init_posix_sem_label, label);
            MAC_DEBUG_COUNTER_INC(&nmacposixsems);
            return (label);
    }
    
    void 
    mac_init_posix_sem(struct ksem *ksemptr)
    {
    
            ksemptr->ks_label = mac_posix_sem_label_alloc();
    }
    
    static void
    mac_posix_sem_label_free(struct label *label)
    {
    
            MAC_PERFORM(destroy_posix_sem_label, label);
            mac_labelzone_free(label);
            MAC_DEBUG_COUNTER_DEC(&nmacposixsems);
    }
    
    void
    mac_destroy_posix_sem(struct ksem *ksemptr)
    {
    
            mac_posix_sem_label_free(ksemptr->ks_label);
            ksemptr->ks_label = NULL;
    }
    
    void 
    mac_create_posix_sem(struct ucred *cred, struct ksem *ksemptr)
   {
   
           MAC_PERFORM(create_posix_sem, cred, ksemptr, ksemptr->ks_label);
   }
   
   int
   mac_check_posix_sem_destroy(struct ucred *cred, struct ksem *ksemptr)
   {
           int error;
   
           if (!mac_enforce_posix_sem)
                   return (0);
   
           MAC_CHECK(check_posix_sem_destroy, cred, ksemptr, ksemptr->ks_label);
   
           return(error);
   }
   
   int
   mac_check_posix_sem_open(struct ucred *cred, struct ksem *ksemptr)
   {
           int error;
   
           if (!mac_enforce_posix_sem)
                   return (0);
   
           MAC_CHECK(check_posix_sem_open, cred, ksemptr, ksemptr->ks_label);
   
           return(error);
   }
   
   int
   mac_check_posix_sem_getvalue(struct ucred *cred, struct ksem *ksemptr)
   {
           int error;
   
           if (!mac_enforce_posix_sem)
                   return (0);
   
           MAC_CHECK(check_posix_sem_getvalue, cred, ksemptr,
               ksemptr->ks_label);
   
           return(error);
   }
   
   int
   mac_check_posix_sem_post(struct ucred *cred, struct ksem *ksemptr)
   {
           int error;
   
           if (!mac_enforce_posix_sem)
                   return (0);
   
           MAC_CHECK(check_posix_sem_post, cred, ksemptr, ksemptr->ks_label);
   
           return(error);
   }
   
   int
   mac_check_posix_sem_unlink(struct ucred *cred, struct ksem *ksemptr)
   {
           int error;
   
           if (!mac_enforce_posix_sem)
                   return (0);
   
           MAC_CHECK(check_posix_sem_unlink, cred, ksemptr, ksemptr->ks_label);
   
           return(error);
   }
   
   int
   mac_check_posix_sem_wait(struct ucred *cred, struct ksem *ksemptr)
   {
           int error;
   
           if (!mac_enforce_posix_sem)
                   return (0);
   
           MAC_CHECK(check_posix_sem_wait, cred, ksemptr, ksemptr->ks_label);
   
           return(error);
   }

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