mac_sysv_sem.c revision 147091 
1/*-
2 * Copyright (c) 2003-2004 Networks Associates Technology, 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 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD: head/sys/security/mac/mac_sysv_sem.c 147091 2005-06-07 05:03:28Z rwatson $");
34
35#include "opt_mac.h"
36
37#include <sys/param.h>
38#include <sys/kernel.h>
39#include <sys/lock.h>
40#include <sys/malloc.h>
41#include <sys/mutex.h>
42#include <sys/mac.h>
43#include <sys/sbuf.h>
44#include <sys/systm.h>
45#include <sys/vnode.h>
46#include <sys/mount.h>
47#include <sys/file.h>
48#include <sys/namei.h>
49#include <sys/sysctl.h>
50#include <sys/sem.h>
51
52#include <sys/mac_policy.h>
53
54#include <security/mac/mac_internal.h>
55
56static int	mac_enforce_sysv_sem = 1;
57SYSCTL_INT(_security_mac, OID_AUTO, enforce_sysv_sem, CTLFLAG_RW,
58    &mac_enforce_sysv_sem, 0, "Enforce MAC policy on System V IPC Semaphores");
59TUNABLE_INT("security.mac.enforce_sysv", &mac_enforce_sysv_sem);
60
61#ifdef MAC_DEBUG
62static unsigned int nmacipcsemas;
63SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipc_semas, CTLFLAG_RD,
64    &nmacipcsemas, 0, "number of sysv ipc semaphore identifiers inuse");
65#endif
66
67static struct label *
68mac_sysv_sem_label_alloc(void)
69{
70	struct label *label;
71
72	label = mac_labelzone_alloc(M_WAITOK);
73	MAC_PERFORM(init_sysv_sem_label, label);
74	MAC_DEBUG_COUNTER_INC(&nmacipcsemas);
75	return (label);
76}
77
78void
79mac_init_sysv_sem(struct semid_kernel *semakptr)
80{
81
82	semakptr->label = mac_sysv_sem_label_alloc();
83}
84
85static void
86mac_sysv_sem_label_free(struct label *label)
87{
88
89	MAC_PERFORM(destroy_sysv_sem_label, label);
90	mac_labelzone_free(label);
91	MAC_DEBUG_COUNTER_DEC(&nmacipcsemas);
92}
93
94void
95mac_destroy_sysv_sem(struct semid_kernel *semakptr)
96{
97
98	mac_sysv_sem_label_free(semakptr->label);
99	semakptr->label = NULL;
100}
101
102void
103mac_create_sysv_sem(struct ucred *cred, struct semid_kernel *semakptr)
104{
105
106	MAC_PERFORM(create_sysv_sem, cred, semakptr, semakptr->label);
107}
108
109void
110mac_cleanup_sysv_sem(struct semid_kernel *semakptr)
111{
112
113	MAC_PERFORM(cleanup_sysv_sem, semakptr->label);
114}
115
116int
117mac_check_sysv_semctl(struct ucred *cred, struct semid_kernel *semakptr,
118    int cmd)
119{
120	int error;
121
122	if (!mac_enforce_sysv_sem)
123		return (0);
124
125	MAC_CHECK(check_sysv_semctl, cred, semakptr, semakptr->label, cmd);
126
127	return(error);
128}
129
130int
131mac_check_sysv_semget(struct ucred *cred, struct semid_kernel *semakptr)
132{
133	int error;
134
135	if (!mac_enforce_sysv_sem)
136		return (0);
137
138	MAC_CHECK(check_sysv_semget, cred, semakptr, semakptr->label);
139
140	return(error);
141}
142
143int
144mac_check_sysv_semop(struct ucred *cred, struct semid_kernel *semakptr,
145    size_t accesstype)
146{
147	int error;
148
149	if (!mac_enforce_sysv_sem)
150		return (0);
151
152	MAC_CHECK(check_sysv_semop, cred, semakptr, semakptr->label,
153	    accesstype);
154
155	return(error);
156}
157