1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
/*-
* Copyright (c) 2003-2004 Networks Associates Technology, Inc.
* Copyright (c) 2007 Robert N. M. Watson
* All rights reserved.
*
* This software was developed for the FreeBSD Project in part by Network
* Associates Laboratories, the Security Research Division of Network
* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
* as part of the DARPA CHATS research program.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_mac.h"
#include <sys/param.h>
#include <sys/module.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <vm/uma.h>
#include <security/mac/mac_framework.h>
#include <security/mac/mac_internal.h>
#include <security/mac/mac_policy.h>
/*
* zone_label is the UMA zone from which most labels are allocated. Label
* structures are initialized to zero bytes so that policies see a NULL/0
* slot on first use, even if the policy is loaded after the label is
* allocated for an object.
*/
static uma_zone_t zone_label;
static int mac_labelzone_ctor(void *mem, int size, void *arg, int flags);
static void mac_labelzone_dtor(void *mem, int size, void *arg);
void
mac_labelzone_init(void)
{
zone_label = uma_zcreate("MAC labels", sizeof(struct label),
mac_labelzone_ctor, mac_labelzone_dtor, NULL, NULL,
UMA_ALIGN_PTR, 0);
}
/*
* mac_init_label() and mac_destroy_label() are exported so that they can be
* used in mbuf tag initialization, where labels are not slab allocated from
* the zone_label zone.
*/
void
mac_init_label(struct label *label)
{
bzero(label, sizeof(*label));
label->l_flags = MAC_FLAG_INITIALIZED;
}
void
mac_destroy_label(struct label *label)
{
KASSERT(label->l_flags & MAC_FLAG_INITIALIZED,
("destroying uninitialized label"));
#ifdef DIAGNOSTIC
bzero(label, sizeof(*label));
#else
label->l_flags &= ~MAC_FLAG_INITIALIZED;
#endif
}
static int
mac_labelzone_ctor(void *mem, int size, void *arg, int flags)
{
struct label *label;
KASSERT(size == sizeof(*label), ("mac_labelzone_ctor: wrong size\n"));
label = mem;
mac_init_label(label);
return (0);
}
static void
mac_labelzone_dtor(void *mem, int size, void *arg)
{
struct label *label;
KASSERT(size == sizeof(*label), ("mac_labelzone_dtor: wrong size\n"));
label = mem;
mac_destroy_label(label);
}
struct label *
mac_labelzone_alloc(int flags)
{
return (uma_zalloc(zone_label, flags));
}
void
mac_labelzone_free(struct label *label)
{
uma_zfree(zone_label, label);
}
/*
* Functions used by policy modules to get and set label values.
*/
intptr_t
mac_label_get(struct label *l, int slot)
{
KASSERT(l != NULL, ("mac_label_get: NULL label"));
return (l->l_perpolicy[slot]);
}
void
mac_label_set(struct label *l, int slot, intptr_t v)
{
KASSERT(l != NULL, ("mac_label_set: NULL label"));
l->l_perpolicy[slot] = v;
}
|
