/*
   * AppArmor security module
   *
   * This file contains basic common functions used in AppArmor
   *
   * Copyright (C) 1998-2008 Novell/SUSE
   * 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.
   */
  
  #include <linux/mm.h>
  #include <linux/slab.h>
  #include <linux/string.h>
  #include <linux/vmalloc.h>
  
  #include "include/audit.h"
  #include "include/apparmor.h"
  
  
  /**
   * aa_split_fqname - split a fqname into a profile and namespace name
   * @fqname: a full qualified name in namespace profile format (NOT NULL)
   * @ns_name: pointer to portion of the string containing the ns name (NOT NULL)
   *
   * Returns: profile name or NULL if one is not specified
   *
   * Split a namespace name from a profile name (see policy.c for naming
   * description).  If a portion of the name is missing it returns NULL for
   * that portion.
   *
   * NOTE: may modify the @fqname string.  The pointers returned point
   *       into the @fqname string.
   */
  char *aa_split_fqname(char *fqname, char **ns_name)
  {
  	char *name = strim(fqname);
  
  	*ns_name = NULL;
  	if (name[0] == ':') {
  		char *split = strchr(&name[1], ':');
  		*ns_name = skip_spaces(&name[1]);
  		if (split) {
  			/* overwrite ':' with \0 */
  			*split++ = 0;
  			if (strncmp(split, "//", 2) == 0)
  				split += 2;
  			name = skip_spaces(split);
  		} else
  			/* a ns name without a following profile is allowed */
  			name = NULL;
  	}
  	if (name && *name == 0)
  		name = NULL;
  
  	return name;
  }
  
  /**
   * aa_info_message - log a none profile related status message
   * @str: message to log
   */
  void aa_info_message(const char *str)
  {
  	if (audit_enabled) {
  		struct common_audit_data sa;
  		struct apparmor_audit_data aad = {0,};
  		sa.type = LSM_AUDIT_DATA_NONE;
  		sa.aad = &aad;
  		aad.info = str;
  		aa_audit_msg(AUDIT_APPARMOR_STATUS, &sa, NULL);
  	}
  	printk(KERN_INFO "AppArmor: %s
  ", str);
  }
  
  /**
   * __aa_kvmalloc - do allocation preferring kmalloc but falling back to vmalloc
   * @size: how many bytes of memory are required
   * @flags: the type of memory to allocate (see kmalloc).
   *
   * Return: allocated buffer or NULL if failed
   *
   * It is possible that policy being loaded from the user is larger than
   * what can be allocated by kmalloc, in those cases fall back to vmalloc.
   */
  void *__aa_kvmalloc(size_t size, gfp_t flags)
  {
  	void *buffer = NULL;
  
  	if (size == 0)
  		return NULL;
  
  	/* do not attempt kmalloc if we need more than 16 pages at once */
  	if (size <= (16*PAGE_SIZE))
  		buffer = kmalloc(size, flags | GFP_NOIO | __GFP_NOWARN);
  	if (!buffer) {
  		if (flags & __GFP_ZERO)
  			buffer = vzalloc(size);
  		else
  			buffer = vmalloc(size);
  	}
  	return buffer;
  }
  
  /**
   * kvfree - free an allocation do by kvmalloc
   * @buffer: buffer to free (MAYBE_NULL)
   *
   * Free a buffer allocated by kvmalloc
   */
  void kvfree(void *buffer)
  {
  	if (is_vmalloc_addr(buffer))
  		vfree(buffer);
  	else
  		kfree(buffer);
  }