linux-kernel - Re: Bad ext3/nfs DoS bug

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Date:	Thu, 27 Jul 2006 20:12:47 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	Eric Sandeen <sandeen@...deen.net>
Cc:	Neil Brown <neilb@...e.de>, Andrew Morton <akpm@...l.org>,
	Theodore Tso <tytso@....edu>, jack@...e.cz, 20@...ingley.org,
	marcel@...tmann.org, linux-kernel@...r.kernel.org, sct@...hat.com,
	adilger@...sterfs.com
Subject: Re: Bad ext3/nfs DoS bug

On Thu, Jul 27, 2006 at 01:32:43PM -0500, Eric Sandeen wrote:
> Neil Brown wrote:
> >On Wednesday July 26, sandeen@...deen.net wrote:
> 
> >>Hm, with this, ext3.ko has a new dependency on exportfs.ko.  Is that 
> >>desirable/acceptable?
> >
> >Drat, you're right.
> >No, I don't think that is what we want.
> >I'll do it differently in a day or so.
> 
> Would moving export_iget into fs/inode.c & exporting it from there be a 
> reasonable way to go?  At least ext2 & ext3 both have this need (prevent 
> nfs access to special inodes) so putting the bulk of what they need for 
> get_dentry (i.e. export_iget) somewhere common seems like a decent 
> option to me.

Nope.  The right fix is to not make ext2/3 rely on export_iget at all. Please
implement the proper export_operations instead, similar to e.g. xfs. 

export_iget is a horrible layering violation that needs to go away long-term,
not move into core code.
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