The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*
    2  * Copyright (c) 2007 Apple Inc. All rights reserved.
    3  *
    4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
    5  * 
    6  * This file contains Original Code and/or Modifications of Original Code
    7  * as defined in and that are subject to the Apple Public Source License
    8  * Version 2.0 (the 'License'). You may not use this file except in
    9  * compliance with the License. The rights granted to you under the License
   10  * may not be used to create, or enable the creation or redistribution of,
   11  * unlawful or unlicensed copies of an Apple operating system, or to
   12  * circumvent, violate, or enable the circumvention or violation of, any
   13  * terms of an Apple operating system software license agreement.
   14  * 
   15  * Please obtain a copy of the License at
   16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
   17  * 
   18  * The Original Code and all software distributed under the License are
   19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
   20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
   21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
   22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
   23  * Please see the License for the specific language governing rights and
   24  * limitations under the License.
   25  * 
   26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
   27  */
   28 /*-
   29  * Copyright (c) 2003-2004 Networks Associates Technology, Inc.
   30  * All rights reserved.
   31  *
   32  * This software was developed for the FreeBSD Project in part by Network
   33  * Associates Laboratories, the Security Research Division of Network
   34  * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
   35  * as part of the DARPA CHATS research program.
   36  *
   37  * Redistribution and use in source and binary forms, with or without
   38  * modification, are permitted provided that the following conditions
   39  * are met:
   40  * 1. Redistributions of source code must retain the above copyright
   41  *    notice, this list of conditions and the following disclaimer.
   42  * 2. Redistributions in binary form must reproduce the above copyright
   43  *    notice, this list of conditions and the following disclaimer in the
   44  *    documentation and/or other materials provided with the distribution.
   45  *
   46  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   47  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   48  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   49  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   50  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   51  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   52  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   53  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   54  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   55  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   56  * SUCH DAMAGE.
   57  */
   58 
   59 #include <sys/cdefs.h>
   60 
   61 #include <sys/cdefs.h>
   62 
   63 #include <sys/param.h>
   64 #include <sys/kernel.h>
   65 #include <sys/lock.h>
   66 #include <sys/malloc.h>
   67 #include <sys/sbuf.h>
   68 #include <sys/systm.h>
   69 #include <sys/vnode.h>
   70 #include <sys/mount.h>
   71 #include <sys/file.h>
   72 #include <sys/namei.h>
   73 #include <sys/sysctl.h>
   74 #include <sys/shm.h>
   75 #include <sys/shm_internal.h>
   76 
   77 #include <security/mac_internal.h>
   78 
   79 
   80 static struct label *
   81 mac_sysv_shm_label_alloc(void)
   82 {
   83         struct label *label;
   84 
   85         label = mac_labelzone_alloc(MAC_WAITOK);
   86         if (label == NULL)
   87                 return (NULL);
   88         MAC_PERFORM(sysvshm_label_init, label);
   89         return (label);
   90 }
   91 
   92 void
   93 mac_sysvshm_label_init(struct shmid_kernel *shmsegptr)
   94 {
   95 
   96         shmsegptr->label = mac_sysv_shm_label_alloc();
   97 }
   98 
   99 static void
  100 mac_sysv_shm_label_free(struct label *label)
  101 {
  102 
  103         MAC_PERFORM(sysvshm_label_destroy, label);
  104         mac_labelzone_free(label);
  105 }
  106 
  107 void
  108 mac_sysvshm_label_destroy(struct shmid_kernel *shmsegptr)
  109 {
  110 
  111         mac_sysv_shm_label_free(shmsegptr->label);
  112         shmsegptr->label = NULL;
  113 }
  114 
  115 void
  116 mac_sysvshm_label_associate(struct ucred *cred, struct shmid_kernel *shmsegptr)
  117 {
  118 
  119         MAC_PERFORM(sysvshm_label_associate, cred, shmsegptr, shmsegptr->label);
  120 }
  121 
  122 void
  123 mac_sysvshm_label_recycle(struct shmid_kernel *shmsegptr)
  124 {
  125 
  126         MAC_PERFORM(sysvshm_label_recycle, shmsegptr->label);
  127 }
  128 
  129 int
  130 mac_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr,
  131     int shmflg)
  132 {
  133         int error;
  134 
  135         if (!mac_sysvshm_enforce)
  136                 return 0;
  137 
  138         MAC_CHECK(sysvshm_check_shmat, cred, shmsegptr, shmsegptr->label,
  139             shmflg);
  140 
  141         return(error);
  142 }
  143 
  144 int
  145 mac_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr,
  146     int cmd)
  147 {
  148         int error;
  149 
  150         if (!mac_sysvshm_enforce)
  151                 return 0;
  152 
  153         MAC_CHECK(sysvshm_check_shmctl, cred, shmsegptr, shmsegptr->label,
  154             cmd);
  155 
  156         return(error);
  157 }
  158 
  159 int
  160 mac_sysvshm_check_shmdt(struct ucred *cred, struct shmid_kernel *shmsegptr)
  161 {
  162         int error;
  163 
  164         if (!mac_sysvshm_enforce)
  165                 return 0;
  166 
  167         MAC_CHECK(sysvshm_check_shmdt, cred, shmsegptr, shmsegptr->label);
  168 
  169         return(error);
  170 }
  171 
  172 int
  173 mac_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr,
  174     int shmflg)
  175 {
  176         int error;
  177 
  178         if (!mac_sysvshm_enforce)
  179                 return 0;
  180 
  181         MAC_CHECK(sysvshm_check_shmget, cred, shmsegptr, shmsegptr->label,
  182             shmflg);
  183 
  184         return(error);
  185 }

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