linux-kernel - [PATCH][1/1] fs: wrong type for 'magic' argument in 'simple_fill

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Date:	Tue, 1 Jun 2010 19:05:56 +0200
From:	Roberto Sassu <roberto.sassu@...ito.it>
To:	linux-fsdevel@...r.kernel.org, linux-ima-user@...ts.sourceforge.net
Cc:	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][1/1] fs: wrong type for 'magic' argument in 'simple_fill_super()', fs/libfs.c

Description of the issue:

The function 'simple_fill_super()' in the path 'fs/libfs.c' takes the 'magic' argument as int. 
In the include file 'include/linux/fs.h' the 's_magic' field of the 'super_block' structure is
declared as unsigned long.
This causes a misbehaviour in the 'Integrity Measurement Architecture' security module, 
since the 's_magic' field is used as criteria to determine if the inode must be measured.

This patch applies to the mainline kernel repository.


From a9f6d9bc7b2259ac025977f4b28a8b90784caf62 Mon Sep 17 00:00:00 2001
From: Roberto Sassu <roberto.sassu@...ito.it>
Date: Tue, 1 Jun 2010 18:28:13 +0200
Subject: [PATCH] BUG: wrong type for magic argument in simple_fill_super(), fs/libfs.c


Signed-off-by: Roberto Sassu <roberto.sassu@...ito.it>
---
 fs/libfs.c         |    2 +-
 include/linux/fs.h |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/libfs.c b/fs/libfs.c
index 09e1016..7d966e8 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -489,7 +489,7 @@ int simple_write_end(struct file *file, struct address_space *mapping,
  * unique inode values later for this filesystem, then you must take care
  * to pass it an appropriate max_reserved value to avoid collisions.
  */
-int simple_fill_super(struct super_block *s, int magic, struct tree_descr *files)
+int simple_fill_super(struct super_block *s, unsigned long magic, struct tree_descr *files)
 {
  	struct inode *inode;
        struct dentry *root;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 3428393..471e1ff 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2388,7 +2388,7 @@ extern const struct file_operations simple_dir_operations;
 extern const struct inode_operations simple_dir_inode_operations;
 struct tree_descr { char *name; const struct file_operations *ops; int mode; };
 struct dentry *d_alloc_name(struct dentry *, const char *);
-extern int simple_fill_super(struct super_block *, int, struct tree_descr *);
+extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *);
 extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
 extern void simple_release_fs(struct vfsmount **mount, int *count);

--
1.6.6.1

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