mac_posix_shm.c revision 255971 
1/*-
2 * Copyright (c) 2003-2006 SPARTA, Inc.
3 * Copyright (c) 2009-2011 Robert N. M. Watson
4 * All rights reserved.
5 *
6 * This software was developed for the FreeBSD Project in part by Network
7 * Associates Laboratories, the Security Research Division of Network
8 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
9 * as part of the DARPA CHATS research program.
10 *
11 * This software was enhanced by SPARTA ISSO under SPAWAR contract
12 * N66001-04-C-6019 ("SEFOS"). *
13 *
14 * This software was developed at the University of Cambridge Computer
15 * Laboratory with support from a grant from Google, Inc.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
19 * are met:
20 * 1. Redistributions of source code must retain the above copyright
21 *    notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 *    notice, this list of conditions and the following disclaimer in the
24 *    documentation and/or other materials provided with the distribution.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD: head/sys/security/mac/mac_posix_shm.c 255971 2013-10-01 15:40:27Z markj $");
41
42#include "opt_kdtrace.h"
43#include "opt_mac.h"
44
45#include <sys/param.h>
46#include <sys/kernel.h>
47#include <sys/mman.h>
48#include <sys/malloc.h>
49#include <sys/module.h>
50#include <sys/sdt.h>
51#include <sys/systm.h>
52#include <sys/sysctl.h>
53
54#include <security/mac/mac_framework.h>
55#include <security/mac/mac_internal.h>
56#include <security/mac/mac_policy.h>
57
58static struct label *
59mac_posixshm_label_alloc(void)
60{
61	struct label *label;
62
63	label = mac_labelzone_alloc(M_WAITOK);
64	MAC_POLICY_PERFORM(posixshm_init_label, label);
65	return (label);
66}
67
68void
69mac_posixshm_init(struct shmfd *shmfd)
70{
71
72	if (mac_labeled & MPC_OBJECT_POSIXSHM)
73		shmfd->shm_label = mac_posixshm_label_alloc();
74	else
75		shmfd->shm_label = NULL;
76}
77
78static void
79mac_posixshm_label_free(struct label *label)
80{
81
82	MAC_POLICY_PERFORM_NOSLEEP(posixshm_destroy_label, label);
83	mac_labelzone_free(label);
84}
85
86void
87mac_posixshm_destroy(struct shmfd *shmfd)
88{
89
90	if (shmfd->shm_label != NULL) {
91		mac_posixshm_label_free(shmfd->shm_label);
92		shmfd->shm_label = NULL;
93	}
94}
95
96void
97mac_posixshm_create(struct ucred *cred, struct shmfd *shmfd)
98{
99
100	MAC_POLICY_PERFORM_NOSLEEP(posixshm_create, cred, shmfd,
101	    shmfd->shm_label);
102}
103
104MAC_CHECK_PROBE_DEFINE2(posixshm_check_create, "struct ucred *",
105    "const char *");
106
107int
108mac_posixshm_check_create(struct ucred *cred, const char *path)
109{
110	int error;
111
112	MAC_POLICY_CHECK_NOSLEEP(posixshm_check_create, cred, path);
113	MAC_CHECK_PROBE2(posixshm_check_create, error, cred, path);
114
115	return (error);
116}
117
118MAC_CHECK_PROBE_DEFINE4(posixshm_check_mmap, "struct ucred *",
119    "struct shmfd *", "int", "int");
120
121int
122mac_posixshm_check_mmap(struct ucred *cred, struct shmfd *shmfd, int prot,
123    int flags)
124{
125	int error;
126
127	MAC_POLICY_CHECK_NOSLEEP(posixshm_check_mmap, cred, shmfd,
128	    shmfd->shm_label, prot, flags);
129	MAC_CHECK_PROBE4(posixshm_check_mmap, error, cred, shmfd, prot,
130	    flags);
131
132	return (error);
133}
134
135MAC_CHECK_PROBE_DEFINE3(posixshm_check_open, "struct ucred *",
136    "struct shmfd *", "accmode_t");
137
138int
139mac_posixshm_check_open(struct ucred *cred, struct shmfd *shmfd,
140    accmode_t accmode)
141{
142	int error;
143
144	MAC_POLICY_CHECK_NOSLEEP(posixshm_check_open, cred, shmfd,
145	    shmfd->shm_label, accmode);
146	MAC_CHECK_PROBE3(posixshm_check_open, error, cred, shmfd, accmode);
147
148	return (error);
149}
150
151MAC_CHECK_PROBE_DEFINE3(posixshm_check_stat, "struct ucred *",
152    "struct ucred *", "struct shmfd *");
153
154int
155mac_posixshm_check_stat(struct ucred *active_cred, struct ucred *file_cred,
156    struct shmfd *shmfd)
157{
158	int error;
159
160	MAC_POLICY_CHECK_NOSLEEP(posixshm_check_stat, active_cred, file_cred,
161	    shmfd, shmfd->shm_label);
162	MAC_CHECK_PROBE3(posixshm_check_stat, error, active_cred, file_cred,
163	    shmfd);
164
165	return (error);
166}
167
168MAC_CHECK_PROBE_DEFINE3(posixshm_check_truncate, "struct ucred *",
169    "struct ucred *", "struct shmfd *");
170
171int
172mac_posixshm_check_truncate(struct ucred *active_cred, struct ucred *file_cred,
173    struct shmfd *shmfd)
174{
175	int error;
176
177	MAC_POLICY_CHECK_NOSLEEP(posixshm_check_truncate, active_cred,
178	    file_cred, shmfd, shmfd->shm_label);
179	MAC_CHECK_PROBE3(posixshm_check_truncate, error, active_cred,
180	    file_cred, shmfd);
181
182	return (error);
183}
184
185MAC_CHECK_PROBE_DEFINE2(posixshm_check_unlink, "struct ucred *",
186    "struct shmfd *");
187
188int
189mac_posixshm_check_unlink(struct ucred *cred, struct shmfd *shmfd)
190{
191	int error;
192
193	MAC_POLICY_CHECK_NOSLEEP(posixshm_check_unlink, cred, shmfd,
194	    shmfd->shm_label);
195	MAC_CHECK_PROBE2(posixshm_check_unlink, error, cred, shmfd);
196
197	return (error);
198}
199
200MAC_CHECK_PROBE_DEFINE3(posixshm_check_setmode, "struct ucred *",
201    "struct shmfd *", "mode_t");
202
203int
204mac_posixshm_check_setmode(struct ucred *cred, struct shmfd *shmfd, mode_t mode)
205{
206	int error;
207
208	MAC_POLICY_CHECK_NOSLEEP(posixshm_check_setmode, cred, shmfd,
209	    shmfd->shm_label, mode);
210	MAC_CHECK_PROBE3(posixshm_check_setmode, error, cred, shmfd, mode);
211
212	return (error);
213}
214
215MAC_CHECK_PROBE_DEFINE4(posixshm_check_setowner, "struct ucred *",
216    "struct shmfd *", "uid_t", "gid_t");
217
218int
219mac_posixshm_check_setowner(struct ucred *cred, struct shmfd *shmfd, uid_t uid,
220    gid_t gid)
221{
222	int error;
223
224	MAC_POLICY_CHECK_NOSLEEP(posixshm_check_setowner, cred, shmfd,
225	    shmfd->shm_label, uid, gid);
226	MAC_CHECK_PROBE4(posixshm_check_setowner, error, cred, shmfd,
227	    uid, gid);
228
229	return (error);
230}
231
232MAC_CHECK_PROBE_DEFINE3(posixshm_check_read, "struct ucred *",
233    "struct ucred *", "struct shmfd *");
234
235int
236mac_posixshm_check_read(struct ucred *active_cred, struct ucred *file_cred,
237    struct shmfd *shmfd)
238{
239	int error;
240
241	MAC_POLICY_CHECK_NOSLEEP(posixshm_check_read, active_cred,
242	    file_cred, shmfd, shmfd->shm_label);
243	MAC_CHECK_PROBE3(posixshm_check_read, error, active_cred,
244	    file_cred, shmfd);
245
246	return (error);
247}
248
249MAC_CHECK_PROBE_DEFINE3(posixshm_check_write, "struct ucred *",
250    "struct ucred *", "struct shmfd *");
251
252int
253mac_posixshm_check_write(struct ucred *active_cred, struct ucred *file_cred,
254    struct shmfd *shmfd)
255{
256	int error;
257
258	MAC_POLICY_CHECK_NOSLEEP(posixshm_check_write, active_cred,
259	    file_cred, shmfd, shmfd->shm_label);
260	MAC_CHECK_PROBE3(posixshm_check_write, error, active_cred,
261	    file_cred, shmfd);
262
263	return (error);
264}
265