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1 | /* |
2 | * AppArmor security module | |
3 | * | |
4 | * This file contains AppArmor security identifier (secid) 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 secid for every profile loaded. If a profile | |
15 | * is replaced it receives the secid of the profile it is replacing. | |
16 | * | |
17 | * The secid 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/secid.h" | |
25 | ||
26 | /* global counter from which secids are allocated */ | |
27 | static u32 global_secid; | |
28 | static DEFINE_SPINLOCK(secid_lock); | |
29 | ||
30 | /* TODO FIXME: add secid to profile mapping, and secid recycling */ | |
31 | ||
32 | /** | |
33 | * aa_alloc_secid - allocate a new secid for a profile | |
34 | */ | |
35 | u32 aa_alloc_secid(void) | |
36 | { | |
37 | u32 secid; | |
38 | ||
39 | /* | |
40 | * TODO FIXME: secid recycling - part of profile mapping table | |
41 | */ | |
42 | spin_lock(&secid_lock); | |
43 | secid = (++global_secid); | |
44 | spin_unlock(&secid_lock); | |
45 | return secid; | |
46 | } | |
47 | ||
48 | /** | |
49 | * aa_free_secid - free a secid | |
50 | * @secid: secid to free | |
51 | */ | |
52 | void aa_free_secid(u32 secid) | |
53 | { | |
54 | ; /* NOP ATM */ | |
55 | } |