linux-kernel - Re: [PATCH v3][RESEND] Check for immutable/append flag in fallocate path

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Message-ID: <20110309212735.GB27747@suse.de>
Date:	Wed, 9 Mar 2011 13:27:35 -0800
From:	Greg KH <gregkh@...e.de>
To:	Marco Stornelli <marco.stornelli@...il.com>
Cc:	viro@...iv.linux.org.uk,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH v3][RESEND] Check for immutable/append flag in fallocate
 path

On Wed, Mar 09, 2011 at 08:42:25PM +0100, Marco Stornelli wrote:
> Il 05/03/2011 11:10, Marco Stornelli ha scritto:
> > From: Marco Stornelli <marco.stornelli@...il.com>
> > 
> > In the fallocate path the kernel doesn't check for the immutable/append
> > flag. It's possible to have a race condition in this scenario: an
> > application open a file in read/write and it does something, meanwhile
> > root set the immutable flag on the file, the application at that point
> > can call fallocate with success. In addition, we don't allow to do any
> > unreserve operation on an append only file but only the reserve one.
> > 
> > Signed-off-by: Marco Stornelli <marco.stornelli@...il.com>
> 
> Al, can you apply this patch please? I add Greg in cc, because maybe he
> could be interested about stable tree.

Please read Documentation/stable_kernel_rules.txt for how to get patches
into stable kernel releases (hint, emailing me like this is not the way
to do it...)

thanks,

greg k-h
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