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

     /*-
      * Copyright (c) 2003-2004 Networks Associates Technology, Inc.
      * Copyright (c) 2006 SPARTA, Inc.
      * Copyright (c) 2009 Robert N. M. Watson
      * 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.
     *
     * This software was enhanced by SPARTA ISSO under SPAWAR contract
     * N66001-04-C-6019 ("SEFOS").
     *
     * This software was developed at the University of Cambridge Computer
     * Laboratory with support from a grant from Google, Inc.
     *
     * 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_kdtrace.h"
    #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/sbuf.h>
    #include <sys/systm.h>
    #include <sys/vnode.h>
    #include <sys/mount.h>
    #include <sys/file.h>
    #include <sys/namei.h>
    #include <sys/sdt.h>
    #include <sys/sysctl.h>
    #include <sys/shm.h>
    
    #include <security/mac/mac_framework.h>
    #include <security/mac/mac_internal.h>
    #include <security/mac/mac_policy.h>
    
    static struct label *
    mac_sysv_shm_label_alloc(void)
    {
            struct label *label;
    
            label = mac_labelzone_alloc(M_WAITOK);
            MAC_POLICY_PERFORM(sysvshm_init_label, label);
            return (label);
    }
    
    void
    mac_sysvshm_init(struct shmid_kernel *shmsegptr)
    {
    
            if (mac_labeled & MPC_OBJECT_SYSVSHM)
                    shmsegptr->label = mac_sysv_shm_label_alloc();
            else
                    shmsegptr->label = NULL;
    }
    
    static void
    mac_sysv_shm_label_free(struct label *label)
    {
    
            MAC_POLICY_PERFORM_NOSLEEP(sysvshm_destroy_label, label);
            mac_labelzone_free(label);
    }
    
    void
    mac_sysvshm_destroy(struct shmid_kernel *shmsegptr)
    {
    
            if (shmsegptr->label != NULL) {
                    mac_sysv_shm_label_free(shmsegptr->label);
                    shmsegptr->label = NULL;
           }
   }
   
   void
   mac_sysvshm_create(struct ucred *cred, struct shmid_kernel *shmsegptr)
   {
   
           MAC_POLICY_PERFORM_NOSLEEP(sysvshm_create, cred, shmsegptr,
               shmsegptr->label);
   }
   
   void
   mac_sysvshm_cleanup(struct shmid_kernel *shmsegptr)
   {
   
           MAC_POLICY_PERFORM_NOSLEEP(sysvshm_cleanup, shmsegptr->label);
   }
   
   MAC_CHECK_PROBE_DEFINE3(sysvshm_check_shmat, "struct ucred *",
       "struct shmid_kernel *", "int");
   
   int
   mac_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr,
       int shmflg)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(sysvshm_check_shmat, cred, shmsegptr,
               shmsegptr->label, shmflg);
           MAC_CHECK_PROBE3(sysvshm_check_shmat, error, cred, shmsegptr,
               shmflg);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(sysvshm_check_shmctl, "struct ucred *",
       "struct shmid_kernel *", "int");
   
   int
   mac_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr,
       int cmd)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(sysvshm_check_shmctl, cred, shmsegptr,
               shmsegptr->label, cmd);
           MAC_CHECK_PROBE3(sysvshm_check_shmctl, error, cred, shmsegptr, cmd);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE2(sysvshm_check_shmdt, "struct ucred *",
       "struct shmid *");
   
   int
   mac_sysvshm_check_shmdt(struct ucred *cred, struct shmid_kernel *shmsegptr)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(sysvshm_check_shmdt, cred, shmsegptr,
               shmsegptr->label);
           MAC_CHECK_PROBE2(sysvshm_check_shmdt, error, cred, shmsegptr);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(sysvshm_check_shmget, "struct ucred *",
       "struct shmid_kernel *", "int");
   
   int
   mac_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr,
       int shmflg)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(sysvshm_check_shmget, cred, shmsegptr,
               shmsegptr->label, shmflg);
           MAC_CHECK_PROBE3(sysvshm_check_shmget, error, cred, shmsegptr,
               shmflg);
   
           return (error);
   }

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