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

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Date:	Thu, 3 Jun 2010 10:06:27 -0400
From:	Eric Paris <eparis@...isplace.org>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	linux-fsdevel@...r.kernel.org,
	linux-ima-user@...ts.sourceforge.net,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Roberto Sassu <roberto.sassu@...ito.it>
Subject: Re: [PATCH][1/1] fs: wrong type for 'magic' argument in 
	'simple_fill_super()', fs/libfs.c

On Tue, Jun 1, 2010 at 1:05 PM, Roberto Sassu <roberto.sassu@...ito.it> wrote:
> 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>

Al,

Can you add the following and push this along to Linus on your next go?

Reviewed-by: Mimi Zohar <zohar@...ibm.com>
Signed-off-by: Eric Paris <eparis@...hat.com>
CC: stable@...nel.org

-Eric
> ---
>  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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