/*
   * AppArmor security module
   *
   * This file contains AppArmor security identifier (secid) 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 secid for every profile loaded.  If a profile
   * is replaced it receives the secid of the profile it is replacing.
   *
   * The secid value of 0 is invalid.
   */
  
  #include <linux/spinlock.h>
  #include <linux/errno.h>
  #include <linux/err.h>
  
  #include "include/secid.h"
  
  /* global counter from which secids are allocated */
  static u32 global_secid;
  static DEFINE_SPINLOCK(secid_lock);
  
  /* TODO FIXME: add secid to profile mapping, and secid recycling */
  
  /**
   * aa_alloc_secid - allocate a new secid for a profile
   */
  u32 aa_alloc_secid(void)
  {
  	u32 secid;
  
  	/*
  	 * TODO FIXME: secid recycling - part of profile mapping table
  	 */
  	spin_lock(&secid_lock);
  	secid = (++global_secid);
  	spin_unlock(&secid_lock);
  	return secid;
  }
  
  /**
   * aa_free_secid - free a secid
   * @secid: secid to free
   */
  void aa_free_secid(u32 secid)
  {
  	;			/* NOP ATM */
  }