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SubjectRe: [malware-list] scanner interface proposal was: [TALPA] Intro to a linux interface for on access scanning
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Theodore Tso <tytso@mit.edu> wrote on 18/08/2008 15:25:11:

> On Mon, Aug 18, 2008 at 02:15:24PM +0100, tvrtko.ursulin@sophos.com
wrote:
> > Then there is still a question of who allows some binary to declare
itself
> > exempt. If that decision was a mistake, or it gets compromised
security
> > will be off. A very powerful mechanism which must not be easily
> > accessible. With a good cache your worries go away even without a
scheme
> > like this.
>
> I have one word for you --- bittorrent. If you are downloading a very
> large torrent (say approximately a gigabyte), and it contains many
> pdf's that are say a few megabytes a piece, and things are coming in
> tribbles, having either a indexing scanner or an AV scanner wake up
> and rescan the file from scratch each time a tiny piece of the pdf
> comes in is going to eat your machine alive....

Huh? I was never advocating re-scan after each modification and I even
explicitly said it does not make sense for AV not only for performance but
because it will be useless most of the time. I thought sending out
modified notification on close makes sense because it is a natural point,
unless someone is trying to subvert which is out of scope. Other have
suggested time delay and lumping up.

Also, just to double-check, you don't think AV scanning would read the
whole file on every write?

--
Tvrtko A. Ursulin
Senior Software Engineer, Sophos

"Views and opinions expressed in this email are strictly those of the
author.
The contents has not been reviewed or approved by Sophos."


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