From 67fa4880c5e059428392ca6f7c2f9c38e8546fea Mon Sep 17 00:00:00 2001
From: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Date: Wed, 9 Dec 2009 15:36:04 +0900
Subject: [PATCH] TOMOYO: Compare filesystem by magic number rather than by
 name.

Please apply below one after merging 1557d33007f63dd96e5d15f33af389378e5f2e54
(Merge git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/sysctl-2.6).
----------
[PATCH for 2.6.33] TOMOYO: Compare filesystem by magic number rather than by name.

We can use magic number for checking whether the filesystem is procfs or not.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>
---
 security/tomoyo/realpath.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/security/tomoyo/realpath.c b/security/tomoyo/realpath.c
index 18369d497eb8..e3c7aa0fb706 100644
--- a/security/tomoyo/realpath.c
+++ b/security/tomoyo/realpath.c
@@ -14,6 +14,7 @@
 #include <linux/mnt_namespace.h>
 #include <linux/fs_struct.h>
 #include <linux/hash.h>
+#include <linux/magic.h>
 
 #include "common.h"
 #include "realpath.h"
@@ -112,7 +113,7 @@ int tomoyo_realpath_from_path2(struct path *path, char *newname,
 		path_put(&ns_root);
 		/* Prepend "/proc" prefix if using internal proc vfs mount. */
 		if (!IS_ERR(sp) && (path->mnt->mnt_parent == path->mnt) &&
-		    (strcmp(path->mnt->mnt_sb->s_type->name, "proc") == 0)) {
+		    (path->mnt->mnt_sb->s_magic == PROC_SUPER_MAGIC)) {
 			sp -= 5;
 			if (sp >= newname)
 				memcpy(sp, "/proc", 5);