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
80static struct label *
81mac_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
92void
93mac_sysvshm_label_init(struct shmid_kernel *shmsegptr)
94{
95
96 shmsegptr->label = mac_sysv_shm_label_alloc();
97}
98
99static void
100mac_sysv_shm_label_free(struct label *label)
101{
102
103 MAC_PERFORM(sysvshm_label_destroy, label);
104 mac_labelzone_free(label);
105}
106
107void
108mac_sysvshm_label_destroy(struct shmid_kernel *shmsegptr)
109{
110
111 mac_sysv_shm_label_free(shmsegptr->label);
112 shmsegptr->label = NULL;
113}
114
115void
116mac_sysvshm_label_associate(struct ucred *cred, struct shmid_kernel *shmsegptr)
117{
118
119 MAC_PERFORM(sysvshm_label_associate, cred, shmsegptr, shmsegptr->label);
120}
121
122void
123mac_sysvshm_label_recycle(struct shmid_kernel *shmsegptr)
124{
125
126 MAC_PERFORM(sysvshm_label_recycle, shmsegptr->label);
127}
128
129int
130mac_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr,
131 int shmflg)
132{
133 int error;
134
135#if SECURITY_MAC_CHECK_ENFORCE
136 /* 21167099 - only check if we allow write */
137 if (!mac_sysvshm_enforce)
138 return (0);
139#endif
140
141 MAC_CHECK(sysvshm_check_shmat, cred, shmsegptr, shmsegptr->label,
142 shmflg);
143
144 return(error);
145}
146
147int
148mac_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr,
149 int cmd)
150{
151 int error;
152
153#if SECURITY_MAC_CHECK_ENFORCE
154 /* 21167099 - only check if we allow write */
155 if (!mac_sysvshm_enforce)
156 return (0);
157#endif
158
159 MAC_CHECK(sysvshm_check_shmctl, cred, shmsegptr, shmsegptr->label,
160 cmd);
161
162 return(error);
163}
164
165int
166mac_sysvshm_check_shmdt(struct ucred *cred, struct shmid_kernel *shmsegptr)
167{
168 int error;
169
170#if SECURITY_MAC_CHECK_ENFORCE
171 /* 21167099 - only check if we allow write */
172 if (!mac_sysvshm_enforce)
173 return (0);
174#endif
175
176 MAC_CHECK(sysvshm_check_shmdt, cred, shmsegptr, shmsegptr->label);
177
178 return(error);
179}
180
181int
182mac_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr,
183 int shmflg)
184{
185 int error;
186
187#if SECURITY_MAC_CHECK_ENFORCE
188 /* 21167099 - only check if we allow write */
189 if (!mac_sysvshm_enforce)
190 return (0);
191#endif
192
193 MAC_CHECK(sysvshm_check_shmget, cred, shmsegptr, shmsegptr->label,
194 shmflg);
195
196 return(error);
197}
198