linux-kernel - Re: [malware-list] TALPA - a threat model? well sorta.

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Date:	Fri, 15 Aug 2008 16:17:42 -0400
From:	Theodore Tso <tytso@....edu>
To:	Valdis.Kletnieks@...edu
Cc:	david@...g.hm, "Press, Jonathan" <Jonathan.Press@...com>,
	Peter Zijlstra <peterz@...radead.org>,
	Helge Hafting <helge.hafting@...el.hist.no>,
	linux-kernel@...r.kernel.org, malware-list@...ts.printk.net,
	hch@...radead.org, andi@...stfloor.org, viro@...IV.linux.org.uk,
	alan@...rguk.ukuu.org.uk, Arjan van de Ven <arjan@...radead.org>
Subject: Re: [malware-list] TALPA - a threat model? well sorta.

On Fri, Aug 15, 2008 at 02:06:47PM -0400, Valdis.Kletnieks@...edu wrote:
> This problem is actually identical to "new file scanned, but you don't have
> the signature available yet so malware isn't detected".
> 
> Those of us who have seen large mail servers pile up queues in the 10s of
> millions in the 45 minutes between when the worm went critical-mass and when
> we got a signature might disagree on it not being a big problem in practice.

For a mail server, I really think something specialized like ClamAV is
a much better solution than something in userspace, which will
probably decide it has to rescan every single file that gets written,
including your mail server logs.   :-)

A specialized solution for a mail server is *always* going to be able
to a more efficient, more practical, and be able to do
application-specialized things (such as refusing the e-mail while the
connection is still open, so you don't have to worry about being RFC
compliant about sending bounce mails when the SMTP return-path is most
likely bogus).

						- Ted
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