mac_label.c revision 165422 
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 165422 2006-12-20 23:13:04Z 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
47/*
48 * zone_label is the UMA zone from which all labels are allocated.  Label
49 * structures are initialized to zero bytes so that policies see a NULL/0
50 * slot on first use, even if the policy is loaded after the label is
51 * allocated for an object.
52 */
53static uma_zone_t	zone_label;
54
55static int	mac_labelzone_ctor(void *mem, int size, void *arg, int flags);
56static void	mac_labelzone_dtor(void *mem, int size, void *arg);
57
58void
59mac_labelzone_init(void)
60{
61
62	zone_label = uma_zcreate("MAC labels", sizeof(struct label),
63	    mac_labelzone_ctor, mac_labelzone_dtor, NULL, NULL,
64	    UMA_ALIGN_PTR, 0);
65}
66
67static int
68mac_labelzone_ctor(void *mem, int size, void *arg, int flags)
69{
70	struct label *label;
71
72	KASSERT(size == sizeof(*label), ("mac_labelzone_ctor: wrong size\n"));
73	label = mem;
74	bzero(label, sizeof(*label));
75	label->l_flags = MAC_FLAG_INITIALIZED;
76	return (0);
77}
78
79static void
80mac_labelzone_dtor(void *mem, int size, void *arg)
81{
82	struct label *label;
83
84	KASSERT(size == sizeof(*label), ("mac_labelzone_dtor: wrong size\n"));
85	label = mem;
86	KASSERT(label->l_flags & MAC_FLAG_INITIALIZED,
87	    ("mac_labelzone_dtor: label not initialized"));
88#ifdef DIAGNOSTIC
89	bzero(label, sizeof(*label));
90#else
91	label->l_flags &= ~MAC_FLAG_INITIALIZED;
92#endif
93}
94
95struct label *
96mac_labelzone_alloc(int flags)
97{
98
99	return (uma_zalloc(zone_label, flags));
100}
101
102void
103mac_labelzone_free(struct label *label)
104{
105
106	uma_zfree(zone_label, label);
107}
108