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1 | /* |
2 | * AppArmor security module | |
3 | * | |
4 | * This file contains AppArmor security identifier (sid) manipulation fns | |
5 | * | |
6 | * Copyright 2009-2010 Canonical Ltd. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License as | |
10 | * published by the Free Software Foundation, version 2 of the | |
11 | * License. | |
12 | * | |
13 | * | |
14 | * AppArmor allocates a unique sid for every profile loaded. If a profile | |
15 | * is replaced it receives the sid of the profile it is replacing. | |
16 | * | |
17 | * The sid value of 0 is invalid. | |
18 | */ | |
19 | ||
20 | #include <linux/spinlock.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/err.h> | |
23 | ||
24 | #include "include/sid.h" | |
25 | ||
26 | /* global counter from which sids are allocated */ | |
27 | static u32 global_sid; | |
28 | static DEFINE_SPINLOCK(sid_lock); | |
29 | ||
30 | /* TODO FIXME: add sid to profile mapping, and sid recycling */ | |
31 | ||
32 | /** | |
33 | * aa_alloc_sid - allocate a new sid for a profile | |
34 | */ | |
35 | u32 aa_alloc_sid(void) | |
36 | { | |
37 | u32 sid; | |
38 | ||
39 | /* | |
40 | * TODO FIXME: sid recycling - part of profile mapping table | |
41 | */ | |
42 | spin_lock(&sid_lock); | |
43 | sid = (++global_sid); | |
44 | spin_unlock(&sid_lock); | |
45 | return sid; | |
46 | } | |
47 | ||
48 | /** | |
49 | * aa_free_sid - free a sid | |
50 | * @sid: sid to free | |
51 | */ | |
52 | void aa_free_sid(u32 sid) | |
53 | { | |
54 | ; /* NOP ATM */ | |
55 | } |