mac_label.c revision 163606 
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_label.c 163606 2006-10-22 11:52:19Z rwatson $");
34
35#include "opt_mac.h"
36
37#include <sys/param.h>
38#include <sys/mac.h>
39#include <sys/sysctl.h>
40#include <sys/systm.h>
41
42#include <vm/uma.h>
43
44#include <security/mac/mac_framework.h>
45#include <security/mac/mac_internal.h>
46
47uma_zone_t	zone_label;
48
49static int	mac_labelzone_ctor(void *mem, int size, void *arg, int flags);
50static void	mac_labelzone_dtor(void *mem, int size, void *arg);
51
52void
53mac_labelzone_init(void)
54{
55
56	zone_label = uma_zcreate("MAC labels", sizeof(struct label),
57	    mac_labelzone_ctor, mac_labelzone_dtor, NULL, NULL,
58	    UMA_ALIGN_PTR, 0);
59}
60
61static int
62mac_labelzone_ctor(void *mem, int size, void *arg, int flags)
63{
64	struct label *label;
65
66	KASSERT(size == sizeof(*label), ("mac_labelzone_ctor: wrong size\n"));
67	label = mem;
68	bzero(label, sizeof(*label));
69	label->l_flags = MAC_FLAG_INITIALIZED;
70	return (0);
71}
72
73static void
74mac_labelzone_dtor(void *mem, int size, void *arg)
75{
76	struct label *label;
77
78	KASSERT(size == sizeof(*label), ("mac_labelzone_dtor: wrong size\n"));
79	label = mem;
80	KASSERT(label->l_flags & MAC_FLAG_INITIALIZED,
81	    ("mac_labelzone_dtor: label not initialized"));
82#ifdef DIAGNOSTIC
83	bzero(label, sizeof(*label));
84#else
85	label->l_flags &= ~MAC_FLAG_INITIALIZED;
86#endif
87}
88
89struct label *
90mac_labelzone_alloc(int flags)
91{
92
93	return (uma_zalloc(zone_label, flags));
94}
95
96void
97mac_labelzone_free(struct label *label)
98{
99
100	uma_zfree(zone_label, label);
101}
102