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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 | } |
56 |
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