Re: [PATCH] smbfs chroot issue (CVE-2006-1864)

[Willy Tarreau <willy@w.ods.org>]

Marcelo,

This patch also applies to 2.4, did you receive it on your side or do you
want me to queue it in -upstream ?

Regards,
Willy

On Thu, May 04, 2006 at 06:40:41PM -0700, Chris Wright wrote:
> From: Olaf Kirch <okir@suse.de>
> 
> Mark Moseley reported that a chroot environment on a SMB share can be
> left via "cd ..\\".  Similar to CVE-2006-1863 issue with cifs, this fix
> is for smbfs.
> 
> Steven French <sfrench@us.ibm.com> wrote:
> 
> Looks fine to me.  This should catch the slash on lookup or equivalent,
> which will be all obvious paths of interest.
> 
> Signed-off-by: Chris Wright <chrisw@sous-sol.org>
> ---
>  This fix is in -stable, but doesn't appear to be in your tree yet.
> 
>  fs/smbfs/dir.c |    5 +++++
>  1 file changed, 5 insertions(+)
> 
> --- linus-2.6.orig/fs/smbfs/dir.c
> +++ linus-2.6/fs/smbfs/dir.c
> @@ -434,6 +434,11 @@ smb_lookup(struct inode *dir, struct den
>  	if (dentry->d_name.len > SMB_MAXNAMELEN)
>  		goto out;
>  
> +	/* Do not allow lookup of names with backslashes in */
> +	error = -EINVAL;
> +	if (memchr(dentry->d_name.name, '\\', dentry->d_name.len))
> +		goto out;
> +
>  	lock_kernel();
>  	error = smb_proc_getattr(dentry, &finfo);
>  #ifdef SMBFS_PARANOIA
> -
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