sid.c
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/*
* AppArmor security module
*
* This file contains AppArmor security identifier (sid) manipulation fns
*
* Copyright 2009-2010 Canonical Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, version 2 of the
* License.
*
*
* AppArmor allocates a unique sid for every profile loaded. If a profile
* is replaced it receives the sid of the profile it is replacing.
*
* The sid value of 0 is invalid.
*/
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/err.h>
#include "include/sid.h"
/* global counter from which sids are allocated */
static u32 global_sid;
static DEFINE_SPINLOCK(sid_lock);
/* TODO FIXME: add sid to profile mapping, and sid recycling */
/**
* aa_alloc_sid - allocate a new sid for a profile
*/
u32 aa_alloc_sid(void)
{
u32 sid;
/*
* TODO FIXME: sid recycling - part of profile mapping table
*/
spin_lock(&sid_lock);
sid = (++global_sid);
spin_unlock(&sid_lock);
return sid;
}
/**
* aa_free_sid - free a sid
* @sid: sid to free
*/
void aa_free_sid(u32 sid)
{
; /* NOP ATM */
}