security/mac_sysv_shm.c

   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         }
  89         MAC_PERFORM(sysvshm_label_init, label);
  90         return label;
  91 }
  92
  93 void
  94 mac_sysvshm_label_init(struct shmid_kernel *shmsegptr)
  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         MAC_PERFORM(sysvshm_label_destroy, label);
 103         mac_labelzone_free(label);
 104 }
 105
 106 void
 107 mac_sysvshm_label_destroy(struct shmid_kernel *shmsegptr)
 108 {
 109         mac_sysv_shm_label_free(shmsegptr->label);
 110         shmsegptr->label = NULL;
 111 }
 112
 113 void
 114 mac_sysvshm_label_associate(struct ucred *cred, struct shmid_kernel *shmsegptr)
 115 {
 116         MAC_PERFORM(sysvshm_label_associate, cred, shmsegptr, shmsegptr->label);
 117 }
 118
 119 void
 120 mac_sysvshm_label_recycle(struct shmid_kernel *shmsegptr)
 121 {
 122         MAC_PERFORM(sysvshm_label_recycle, shmsegptr->label);
 123 }
 124
 125 int
 126 mac_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr,
 127     int shmflg)
 128 {
 129         int error;
 130
 131 #if SECURITY_MAC_CHECK_ENFORCE
 132         /* 21167099 - only check if we allow write */
 133         if (!mac_sysvshm_enforce) {
 134                 return 0;
 135         }
 136 #endif
 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 SECURITY_MAC_CHECK_ENFORCE
 151         /* 21167099 - only check if we allow write */
 152         if (!mac_sysvshm_enforce) {
 153                 return 0;
 154         }
 155 #endif
 156
 157         MAC_CHECK(sysvshm_check_shmctl, cred, shmsegptr, shmsegptr->label,
 158             cmd);
 159
 160         return error;
 161 }
 162
 163 int
 164 mac_sysvshm_check_shmdt(struct ucred *cred, struct shmid_kernel *shmsegptr)
 165 {
 166         int error;
 167
 168 #if SECURITY_MAC_CHECK_ENFORCE
 169         /* 21167099 - only check if we allow write */
 170         if (!mac_sysvshm_enforce) {
 171                 return 0;
 172         }
 173 #endif
 174
 175         MAC_CHECK(sysvshm_check_shmdt, cred, shmsegptr, shmsegptr->label);
 176
 177         return error;
 178 }
 179
 180 int
 181 mac_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr,
 182     int shmflg)
 183 {
 184         int error;
 185
 186 #if SECURITY_MAC_CHECK_ENFORCE
 187         /* 21167099 - only check if we allow write */
 188         if (!mac_sysvshm_enforce) {
 189                 return 0;
 190         }
 191 #endif
 192
 193         MAC_CHECK(sysvshm_check_shmget, cred, shmsegptr, shmsegptr->label,
 194             shmflg);
 195
 196         return error;
 197 }