1/*-
2 * Copyright (c) 2003-2004 Networks Associates Technology, Inc.
3 * Copyright (c) 2006 SPARTA, Inc.
4 * Copyright (c) 2009 Robert N. M. Watson
5 * All rights reserved.
6 *
7 * This software was developed for the FreeBSD Project in part by Network
8 * Associates Laboratories, the Security Research Division of Network
9 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
10 * as part of the DARPA CHATS research program.
11 *
12 * This software was enhanced by SPARTA ISSO under SPAWAR contract
13 * N66001-04-C-6019 ("SEFOS").
14 *
15 * This software was developed at the University of Cambridge Computer
16 * Laboratory with support from a grant from Google, Inc.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
20 * are met:
21 * 1. Redistributions of source code must retain the above copyright
22 *    notice, this list of conditions and the following disclaimer.
23 * 2. Redistributions in binary form must reproduce the above copyright
24 *    notice, this list of conditions and the following disclaimer in the
25 *    documentation and/or other materials provided with the distribution.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 */
39
40#include <sys/cdefs.h>
41__FBSDID("$FreeBSD: releng/11.0/sys/security/mac/mac_sysv_shm.c 258541 2013-11-25 07:38:45Z attilio $");
42
43#include "opt_mac.h"
44
45#include <sys/param.h>
46#include <sys/kernel.h>
47#include <sys/lock.h>
48#include <sys/malloc.h>
49#include <sys/mutex.h>
50#include <sys/sbuf.h>
51#include <sys/systm.h>
52#include <sys/vnode.h>
53#include <sys/mount.h>
54#include <sys/file.h>
55#include <sys/namei.h>
56#include <sys/sdt.h>
57#include <sys/sysctl.h>
58#include <sys/shm.h>
59
60#include <security/mac/mac_framework.h>
61#include <security/mac/mac_internal.h>
62#include <security/mac/mac_policy.h>
63
64static struct label *
65mac_sysv_shm_label_alloc(void)
66{
67	struct label *label;
68
69	label = mac_labelzone_alloc(M_WAITOK);
70	MAC_POLICY_PERFORM(sysvshm_init_label, label);
71	return (label);
72}
73
74void
75mac_sysvshm_init(struct shmid_kernel *shmsegptr)
76{
77
78	if (mac_labeled & MPC_OBJECT_SYSVSHM)
79		shmsegptr->label = mac_sysv_shm_label_alloc();
80	else
81		shmsegptr->label = NULL;
82}
83
84static void
85mac_sysv_shm_label_free(struct label *label)
86{
87
88	MAC_POLICY_PERFORM_NOSLEEP(sysvshm_destroy_label, label);
89	mac_labelzone_free(label);
90}
91
92void
93mac_sysvshm_destroy(struct shmid_kernel *shmsegptr)
94{
95
96	if (shmsegptr->label != NULL) {
97		mac_sysv_shm_label_free(shmsegptr->label);
98		shmsegptr->label = NULL;
99	}
100}
101
102void
103mac_sysvshm_create(struct ucred *cred, struct shmid_kernel *shmsegptr)
104{
105
106	MAC_POLICY_PERFORM_NOSLEEP(sysvshm_create, cred, shmsegptr,
107	    shmsegptr->label);
108}
109
110void
111mac_sysvshm_cleanup(struct shmid_kernel *shmsegptr)
112{
113
114	MAC_POLICY_PERFORM_NOSLEEP(sysvshm_cleanup, shmsegptr->label);
115}
116
117MAC_CHECK_PROBE_DEFINE3(sysvshm_check_shmat, "struct ucred *",
118    "struct shmid_kernel *", "int");
119
120int
121mac_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr,
122    int shmflg)
123{
124	int error;
125
126	MAC_POLICY_CHECK_NOSLEEP(sysvshm_check_shmat, cred, shmsegptr,
127	    shmsegptr->label, shmflg);
128	MAC_CHECK_PROBE3(sysvshm_check_shmat, error, cred, shmsegptr,
129	    shmflg);
130
131	return (error);
132}
133
134MAC_CHECK_PROBE_DEFINE3(sysvshm_check_shmctl, "struct ucred *",
135    "struct shmid_kernel *", "int");
136
137int
138mac_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr,
139    int cmd)
140{
141	int error;
142
143	MAC_POLICY_CHECK_NOSLEEP(sysvshm_check_shmctl, cred, shmsegptr,
144	    shmsegptr->label, cmd);
145	MAC_CHECK_PROBE3(sysvshm_check_shmctl, error, cred, shmsegptr, cmd);
146
147	return (error);
148}
149
150MAC_CHECK_PROBE_DEFINE2(sysvshm_check_shmdt, "struct ucred *",
151    "struct shmid *");
152
153int
154mac_sysvshm_check_shmdt(struct ucred *cred, struct shmid_kernel *shmsegptr)
155{
156	int error;
157
158	MAC_POLICY_CHECK_NOSLEEP(sysvshm_check_shmdt, cred, shmsegptr,
159	    shmsegptr->label);
160	MAC_CHECK_PROBE2(sysvshm_check_shmdt, error, cred, shmsegptr);
161
162	return (error);
163}
164
165MAC_CHECK_PROBE_DEFINE3(sysvshm_check_shmget, "struct ucred *",
166    "struct shmid_kernel *", "int");
167
168int
169mac_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr,
170    int shmflg)
171{
172	int error;
173
174	MAC_POLICY_CHECK_NOSLEEP(sysvshm_check_shmget, cred, shmsegptr,
175	    shmsegptr->label, shmflg);
176	MAC_CHECK_PROBE3(sysvshm_check_shmget, error, cred, shmsegptr,
177	    shmflg);
178
179	return (error);
180}
181