| John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 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 | } |