mac_posix_shm.c revision 182063 
1/*-
2 * Copyright (c) 2003-2006 SPARTA, Inc.
3 * All rights reserved.
4 *
5 * This software was developed for the FreeBSD Project in part by Network
6 * Associates Laboratories, the Security Research Division of Network
7 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
8 * as part of the DARPA CHATS research program.
9 *
10 * This software was enhanced by SPARTA ISSO under SPAWAR contract
11 * N66001-04-C-6019 ("SEFOS").
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 *    notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 *    notice, this list of conditions and the following disclaimer in the
20 *    documentation and/or other materials provided with the distribution.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD: head/sys/security/mac/mac_posix_shm.c 182063 2008-08-23 15:26:36Z rwatson $");
37
38#include "opt_mac.h"
39
40#include <sys/param.h>
41#include <sys/kernel.h>
42#include <sys/mman.h>
43#include <sys/malloc.h>
44#include <sys/module.h>
45#include <sys/systm.h>
46#include <sys/sysctl.h>
47
48#include <security/mac/mac_framework.h>
49#include <security/mac/mac_internal.h>
50#include <security/mac/mac_policy.h>
51
52static struct label *
53mac_posixshm_label_alloc(void)
54{
55	struct label *label;
56
57	label = mac_labelzone_alloc(M_WAITOK);
58	MAC_PERFORM(posixshm_init_label, label);
59	return (label);
60}
61
62void
63mac_posixshm_init(struct shmfd *shmfd)
64{
65
66	if (mac_labeled & MPC_OBJECT_POSIXSHM)
67		shmfd->shm_label = mac_posixshm_label_alloc();
68	else
69		shmfd->shm_label = NULL;
70}
71
72static void
73mac_posixshm_label_free(struct label *label)
74{
75
76	MAC_PERFORM(posixshm_destroy_label, label);
77	mac_labelzone_free(label);
78}
79
80void
81mac_posixshm_destroy(struct shmfd *shmfd)
82{
83
84	if (shmfd->shm_label != NULL) {
85		mac_posixshm_label_free(shmfd->shm_label);
86		shmfd->shm_label = NULL;
87	}
88}
89
90void
91mac_posixshm_create(struct ucred *cred, struct shmfd *shmfd)
92{
93
94	MAC_PERFORM(posixshm_create, cred, shmfd, shmfd->shm_label);
95}
96
97int
98mac_posixshm_check_mmap(struct ucred *cred, struct shmfd *shmfd, int prot,
99    int flags)
100{
101	int error;
102
103	MAC_CHECK(posixshm_check_mmap, cred, shmfd, shmfd->shm_label, prot,
104	    flags);
105
106	return (error);
107}
108
109int
110mac_posixshm_check_open(struct ucred *cred, struct shmfd *shmfd)
111{
112	int error;
113
114	MAC_CHECK(posixshm_check_open, cred, shmfd, shmfd->shm_label);
115
116	return (error);
117}
118
119int
120mac_posixshm_check_stat(struct ucred *active_cred, struct ucred *file_cred,
121    struct shmfd *shmfd)
122{
123	int error;
124
125	MAC_CHECK(posixshm_check_stat, active_cred, file_cred, shmfd,
126	    shmfd->shm_label);
127
128	return (error);
129}
130
131int
132mac_posixshm_check_truncate(struct ucred *active_cred, struct ucred *file_cred,
133    struct shmfd *shmfd)
134{
135	int error;
136
137	MAC_CHECK(posixshm_check_truncate, active_cred, file_cred, shmfd,
138	    shmfd->shm_label);
139
140	return (error);
141}
142
143int
144mac_posixshm_check_unlink(struct ucred *cred, struct shmfd *shmfd)
145{
146	int error;
147
148	MAC_CHECK(posixshm_check_unlink, cred, shmfd, shmfd->shm_label);
149
150	return (error);
151}
152