Root/security/apparmor/sid.c

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 */
27static u32 global_sid;
28static 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 */
35u32 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 */
52void aa_free_sid(u32 sid)
53{
54    ; /* NOP ATM */
55}
56

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