/* * 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 */}