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 #include "opt_mac.h"
42
43 #include <sys/param.h>
44 #include <sys/kernel.h>
45 #include <sys/lock.h>
46 #include <sys/malloc.h>
47 #include <sys/mutex.h>
48 #include <sys/sbuf.h>
49 #include <sys/systm.h>
50 #include <sys/vnode.h>
51 #include <sys/mount.h>
52 #include <sys/file.h>
53 #include <sys/namei.h>
54 #include <sys/sdt.h>
55 #include <sys/sysctl.h>
56 #include <sys/shm.h>
57
58 #include <security/mac/mac_framework.h>
59 #include <security/mac/mac_internal.h>
60 #include <security/mac/mac_policy.h>
61
62 static struct label *
mac_sysv_shm_label_alloc(void)63 mac_sysv_shm_label_alloc(void)
64 {
65 struct label *label;
66
67 label = mac_labelzone_alloc(M_WAITOK);
68 MAC_POLICY_PERFORM(sysvshm_init_label, label);
69 return (label);
70 }
71
72 void
mac_sysvshm_init(struct shmid_kernel * shmsegptr)73 mac_sysvshm_init(struct shmid_kernel *shmsegptr)
74 {
75
76 if (mac_labeled & MPC_OBJECT_SYSVSHM)
77 shmsegptr->label = mac_sysv_shm_label_alloc();
78 else
79 shmsegptr->label = NULL;
80 }
81
82 static void
mac_sysv_shm_label_free(struct label * label)83 mac_sysv_shm_label_free(struct label *label)
84 {
85
86 MAC_POLICY_PERFORM_NOSLEEP(sysvshm_destroy_label, label);
87 mac_labelzone_free(label);
88 }
89
90 void
mac_sysvshm_destroy(struct shmid_kernel * shmsegptr)91 mac_sysvshm_destroy(struct shmid_kernel *shmsegptr)
92 {
93
94 if (shmsegptr->label != NULL) {
95 mac_sysv_shm_label_free(shmsegptr->label);
96 shmsegptr->label = NULL;
97 }
98 }
99
100 void
mac_sysvshm_create(struct ucred * cred,struct shmid_kernel * shmsegptr)101 mac_sysvshm_create(struct ucred *cred, struct shmid_kernel *shmsegptr)
102 {
103
104 MAC_POLICY_PERFORM_NOSLEEP(sysvshm_create, cred, shmsegptr,
105 shmsegptr->label);
106 }
107
108 void
mac_sysvshm_cleanup(struct shmid_kernel * shmsegptr)109 mac_sysvshm_cleanup(struct shmid_kernel *shmsegptr)
110 {
111
112 MAC_POLICY_PERFORM_NOSLEEP(sysvshm_cleanup, shmsegptr->label);
113 }
114
115 MAC_CHECK_PROBE_DEFINE3(sysvshm_check_shmat, "struct ucred *",
116 "struct shmid_kernel *", "int");
117
118 int
mac_sysvshm_check_shmat(struct ucred * cred,struct shmid_kernel * shmsegptr,int shmflg)119 mac_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr,
120 int shmflg)
121 {
122 int error;
123
124 MAC_POLICY_CHECK_NOSLEEP(sysvshm_check_shmat, cred, shmsegptr,
125 shmsegptr->label, shmflg);
126 MAC_CHECK_PROBE3(sysvshm_check_shmat, error, cred, shmsegptr,
127 shmflg);
128
129 return (error);
130 }
131
132 MAC_CHECK_PROBE_DEFINE3(sysvshm_check_shmctl, "struct ucred *",
133 "struct shmid_kernel *", "int");
134
135 int
mac_sysvshm_check_shmctl(struct ucred * cred,struct shmid_kernel * shmsegptr,int cmd)136 mac_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr,
137 int cmd)
138 {
139 int error;
140
141 MAC_POLICY_CHECK_NOSLEEP(sysvshm_check_shmctl, cred, shmsegptr,
142 shmsegptr->label, cmd);
143 MAC_CHECK_PROBE3(sysvshm_check_shmctl, error, cred, shmsegptr, cmd);
144
145 return (error);
146 }
147
148 MAC_CHECK_PROBE_DEFINE2(sysvshm_check_shmdt, "struct ucred *",
149 "struct shmid *");
150
151 int
mac_sysvshm_check_shmdt(struct ucred * cred,struct shmid_kernel * shmsegptr)152 mac_sysvshm_check_shmdt(struct ucred *cred, struct shmid_kernel *shmsegptr)
153 {
154 int error;
155
156 MAC_POLICY_CHECK_NOSLEEP(sysvshm_check_shmdt, cred, shmsegptr,
157 shmsegptr->label);
158 MAC_CHECK_PROBE2(sysvshm_check_shmdt, error, cred, shmsegptr);
159
160 return (error);
161 }
162
163 MAC_CHECK_PROBE_DEFINE3(sysvshm_check_shmget, "struct ucred *",
164 "struct shmid_kernel *", "int");
165
166 int
mac_sysvshm_check_shmget(struct ucred * cred,struct shmid_kernel * shmsegptr,int shmflg)167 mac_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr,
168 int shmflg)
169 {
170 int error;
171
172 MAC_POLICY_CHECK_NOSLEEP(sysvshm_check_shmget, cred, shmsegptr,
173 shmsegptr->label, shmflg);
174 MAC_CHECK_PROBE3(sysvshm_check_shmget, error, cred, shmsegptr,
175 shmflg);
176
177 return (error);
178 }
179