apparmor: misc cleanup of match

tidying up comments, includes and defines

Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Kees Cook <kees@ubuntu.com>

2 files changed, 14 insertions, 8 deletions

diff --git a/security/apparmor/include/match.h b/security/apparmor/include/match.h
index 775843e..bbbf56f 100644
--- a/security/apparmor/include/match.h
+++ b/security/apparmor/include/match.h
@@ -4,7 +4,7 @@
  * This file contains AppArmor policy dfa matching engine definitions.
  *
  * Copyright (C) 1998-2008 Novell/SUSE
- * Copyright 2009-2010 Canonical Ltd.
+ * Copyright 2009-2012 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
@@ -16,7 +16,6 @@
 #define __AA_MATCH_H
 
 #include <linux/kref.h>
-#include <linux/workqueue.h>
 
 #define DFA_NOMATCH			0
 #define DFA_START			1
@@ -29,12 +28,20 @@
  * file format (--tables-file option; see Table File Format in the flex
  * info pages and the flex sources for documentation). The magic number
  * used in the header is 0x1B5E783D instead of 0xF13C57B1 though, because
- * the YY_ID_CHK (check) and YY_ID_DEF (default) tables are used
- * slightly differently (see the apparmor-parser package).
+ * new tables have been defined and others YY_ID_CHK (check) and YY_ID_DEF
+ * (default) tables are used slightly differently (see the apparmor-parser
+ * package).
+ *
+ *
+ * The data in the packed dfa is stored in network byte order, and the tables
+ * are arranged for flexibility.  We convert the table data to host native
+ * byte order.
+ *
+ * The dfa begins with a table set header, and is followed by the actual
+ * tables.
  */
 
 #define YYTH_MAGIC	0x1B5E783D
-#define YYTH_DEF_RECURSE 0x1			/* DEF Table is recursive */
 
 struct table_set_header {
 	u32 th_magic;		/* YYTH_MAGIC */
@@ -63,7 +70,7 @@ struct table_set_header {
 #define YYTD_DATA32	4
 #define YYTD_DATA64	8
 
-/* Each ACCEPT2 table gets 6 dedicated flags, YYTD_DATAX define the
+/* ACCEPT & ACCEPT2 tables gets 6 dedicated flags, YYTD_DATAX define the
  * first flags
  */
 #define ACCEPT1_FLAGS(X) ((X) & 0x3f)
diff --git a/security/apparmor/match.c b/security/apparmor/match.c
index dfd25a9..1ff8230 100644
--- a/security/apparmor/match.c
+++ b/security/apparmor/match.c
@@ -4,7 +4,7 @@
  * This file contains AppArmor dfa based regular expression matching engine
  *
  * Copyright (C) 1998-2008 Novell/SUSE
- * Copyright 2009-2010 Canonical Ltd.
+ * Copyright 2009-2012 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
@@ -137,7 +137,6 @@ static int verify_dfa(struct aa_dfa *dfa, int flags)
 		for (i = 0; i < state_count; i++) {
 			if (DEFAULT_TABLE(dfa)[i] >= state_count)
 				goto out;
-			/* TODO: do check that DEF state recursion terminates */
 			if (BASE_TABLE(dfa)[i] + 255 >= trans_count) {
 				printk(KERN_ERR "AppArmor DFA next/check upper "
 				       "bounds error\n");