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
80void
81mac_sysvshm_label_init(struct shmid_kernel *shmsegptr)
82{
83 mac_labelzone_alloc_owned(labelp: &shmsegptr->label, MAC_WAITOK, extra_setup: ^(struct label *label) {
84 MAC_PERFORM(sysvshm_label_init, label);
85 });
86}
87
88struct label *
89mac_sysvshm_label(struct shmid_kernel *shmsegptr)
90{
91 return mac_label_verify(labelp: &shmsegptr->label);
92}
93
94void
95mac_sysvshm_label_destroy(struct shmid_kernel *shmsegptr)
96{
97 mac_labelzone_free_owned(labelp: &shmsegptr->label, extra_deinit: ^(struct label *label) {
98 MAC_PERFORM(sysvshm_label_destroy, label);
99 });
100}
101
102void
103mac_sysvshm_label_associate(struct ucred *cred, struct shmid_kernel *shmsegptr)
104{
105 MAC_PERFORM(sysvshm_label_associate, cred, shmsegptr, mac_sysvshm_label(shmsegptr));
106}
107
108void
109mac_sysvshm_label_recycle(struct shmid_kernel *shmsegptr)
110{
111 MAC_PERFORM(sysvshm_label_recycle, mac_sysvshm_label(shmsegptr));
112}
113
114int
115mac_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr,
116 int shmflg)
117{
118 int error;
119
120#if SECURITY_MAC_CHECK_ENFORCE
121 /* 21167099 - only check if we allow write */
122 if (!mac_sysvshm_enforce) {
123 return 0;
124 }
125#endif
126
127 MAC_CHECK(sysvshm_check_shmat, cred, shmsegptr, mac_sysvshm_label(shmsegptr),
128 shmflg);
129
130 return error;
131}
132
133int
134mac_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr,
135 int cmd)
136{
137 int error;
138
139#if SECURITY_MAC_CHECK_ENFORCE
140 /* 21167099 - only check if we allow write */
141 if (!mac_sysvshm_enforce) {
142 return 0;
143 }
144#endif
145
146 MAC_CHECK(sysvshm_check_shmctl, cred, shmsegptr, mac_sysvshm_label(shmsegptr),
147 cmd);
148
149 return error;
150}
151
152int
153mac_sysvshm_check_shmdt(struct ucred *cred, struct shmid_kernel *shmsegptr)
154{
155 int error;
156
157#if SECURITY_MAC_CHECK_ENFORCE
158 /* 21167099 - only check if we allow write */
159 if (!mac_sysvshm_enforce) {
160 return 0;
161 }
162#endif
163
164 MAC_CHECK(sysvshm_check_shmdt, cred, shmsegptr, mac_sysvshm_label(shmsegptr));
165
166 return error;
167}
168
169int
170mac_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr,
171 int shmflg)
172{
173 int error;
174
175#if SECURITY_MAC_CHECK_ENFORCE
176 /* 21167099 - only check if we allow write */
177 if (!mac_sysvshm_enforce) {
178 return 0;
179 }
180#endif
181
182 MAC_CHECK(sysvshm_check_shmget, cred, shmsegptr, mac_sysvshm_label(shmsegptr),
183 shmflg);
184
185 return error;
186}
187