xref: /freebsd/sys/security/mac/mac_sysv_sem.c (revision 39beb93c3f8bdbf72a61fda42300b5ebed7390c8)
1 /*-
2  * Copyright (c) 2003-2004 Networks Associates Technology, Inc.
3  * Copyright (c) 2006 SPARTA, Inc.
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  * Redistribution and use in source and binary forms, with or without
15  * modification, are permitted provided that the following conditions
16  * are met:
17  * 1. Redistributions of source code must retain the above copyright
18  *    notice, this list of conditions and the following disclaimer.
19  * 2. Redistributions in binary form must reproduce the above copyright
20  *    notice, this list of conditions and the following disclaimer in the
21  *    documentation and/or other materials provided with the distribution.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33  * SUCH DAMAGE.
34  */
35 
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
38 
39 #include "opt_mac.h"
40 
41 #include <sys/param.h>
42 #include <sys/kernel.h>
43 #include <sys/lock.h>
44 #include <sys/malloc.h>
45 #include <sys/mutex.h>
46 #include <sys/sbuf.h>
47 #include <sys/systm.h>
48 #include <sys/vnode.h>
49 #include <sys/mount.h>
50 #include <sys/file.h>
51 #include <sys/namei.h>
52 #include <sys/sysctl.h>
53 #include <sys/sem.h>
54 
55 #include <security/mac/mac_framework.h>
56 #include <security/mac/mac_internal.h>
57 #include <security/mac/mac_policy.h>
58 
59 static struct label *
60 mac_sysv_sem_label_alloc(void)
61 {
62 	struct label *label;
63 
64 	label = mac_labelzone_alloc(M_WAITOK);
65 	MAC_PERFORM(sysvsem_init_label, label);
66 	return (label);
67 }
68 
69 void
70 mac_sysvsem_init(struct semid_kernel *semakptr)
71 {
72 
73 	if (mac_labeled & MPC_OBJECT_SYSVSEM)
74 		semakptr->label = mac_sysv_sem_label_alloc();
75 	else
76 		semakptr->label = NULL;
77 }
78 
79 static void
80 mac_sysv_sem_label_free(struct label *label)
81 {
82 
83 	MAC_PERFORM(sysvsem_destroy_label, label);
84 	mac_labelzone_free(label);
85 }
86 
87 void
88 mac_sysvsem_destroy(struct semid_kernel *semakptr)
89 {
90 
91 	if (semakptr->label != NULL) {
92 		mac_sysv_sem_label_free(semakptr->label);
93 		semakptr->label = NULL;
94 	}
95 }
96 
97 void
98 mac_sysvsem_create(struct ucred *cred, struct semid_kernel *semakptr)
99 {
100 
101 	MAC_PERFORM(sysvsem_create, cred, semakptr, semakptr->label);
102 }
103 
104 void
105 mac_sysvsem_cleanup(struct semid_kernel *semakptr)
106 {
107 
108 	MAC_PERFORM(sysvsem_cleanup, semakptr->label);
109 }
110 
111 int
112 mac_sysvsem_check_semctl(struct ucred *cred, struct semid_kernel *semakptr,
113     int cmd)
114 {
115 	int error;
116 
117 	MAC_CHECK(sysvsem_check_semctl, cred, semakptr, semakptr->label,
118 	    cmd);
119 
120 	return (error);
121 }
122 
123 int
124 mac_sysvsem_check_semget(struct ucred *cred, struct semid_kernel *semakptr)
125 {
126 	int error;
127 
128 	MAC_CHECK(sysvsem_check_semget, cred, semakptr, semakptr->label);
129 
130 	return (error);
131 }
132 
133 int
134 mac_sysvsem_check_semop(struct ucred *cred, struct semid_kernel *semakptr,
135     size_t accesstype)
136 {
137 	int error;
138 
139 	MAC_CHECK(sysvsem_check_semop, cred, semakptr, semakptr->label,
140 	    accesstype);
141 
142 	return (error);
143 }
144