linux-kernel - Re: security_file

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Date:	Thu, 16 Jul 2009 10:05:47 +1000 (EST)
From:	James Morris <jmorris@...ei.org>
To:	linux-security-module@...r.kernel.org,
	Sten Spans <Sten_Spans@...ua.de>
cc:	linux-kernel@...r.kernel.org
Subject: Re: security_file_lock cmd argument

> From: Sten Spans <Sten_Spans@...ua.de>

This looks good, but you need to add a signed-off-by line per 
Documentation/SubmittingPatches


> To: linux-kernel@...r.kernel.org
> Subject: security_file_lock cmd argument
> 
> 
> I was playing around with the security_file_lock hook which
> is invoked from fs/locks.c. The desciption in include/linux/security.h
> states the following:
> 
>  * @file_lock:
>  *      Check permission before performing file locking operations.
>  *      Note: this hook mediates both flock and fcntl style locks.
>  *      @file contains the file structure.
>  *      @cmd contains the posix-translated lock operation to perform
>  *      (e.g. F_RDLCK, F_WRLCK).
> 
> However when invoked via sys_flock:
> 
> SYSCALL_DEFINE2(flock, unsigned int, fd, unsigned int, cmd)
> {
> ..
>         error = security_file_lock(filp, cmd);
> 
> Which results in passing flock style arguments (LOCK_*) rather
> than fcntl (F_*LCK). This also is inconsistent with the two
> other security_file_lock invocations in the same file.
> This one-liner fixes the issue:
> 
> --- fs/locks.c.orig	2009-07-09 11:26:45.000000000 +0200
> +++ fs/locks.c	2009-07-09 11:27:24.000000000 +0200
> @@ -1590,7 +1590,7 @@
>  	if (can_sleep)
>  		lock->fl_flags |= FL_SLEEP;
>  
> -	error = security_file_lock(filp, cmd);
> +	error = security_file_lock(filp, lock->fl_type);
>  	if (error)
>  		goto out_free;
>  
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-- 
James Morris
<jmorris@...ei.org>
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