Linux Kernel  3.7.1
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sid.c
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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 
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 
53 {
54  ; /* NOP ATM */
55 }