From: douglas.leeder@sophos.com
To: "Press, Jonathan" <Jonathan.Press@ca.com>
Cc: alan@lxorguk.ukuu.org.uk, andi@firstfloor.org,
Arjan van de Ven <arjan@infradead.org>,
hch@infradead.org, "Helge Hafting" <helge.hafting@aitel.hist.no>,
linux-kernel@vger.kernel.org, malware-list@lists.printk.net,
"Peter Zijlstra" <peterz@infradead.org>,
viro@ZenIV.linux.org.uk
Subject: Re: [malware-list] TALPA - a threat model? well sorta.
Date: Fri, 15 Aug 2008 14:18:12 +0100 [thread overview]
Message-ID: <20080815131820.053BF31679D@pmx1.sophos.com> (raw)
In-Reply-To: <2629CC4E1D22A64593B02C43E855530304AE4BF6@USILMS12.ca.com>
Jon Press wrote on 2008-08-15 14:10:21:
> > -----Original Message-----
> > From: malware-list-bounces@dmesg.printk.net [mailto:malware-list-
> > bounces@dmesg.printk.net] On Behalf Of Peter Zijlstra
> > Sent: Friday, August 15, 2008 6:37 AM
> > To: Helge Hafting
> > Cc: linux-kernel@vger.kernel.org; malware-list@lists.printk.net;
> hch@infradead.org;
> > andi@firstfloor.org; viro@ZenIV.linux.org.uk;
> alan@lxorguk.ukuu.org.uk; Arjan van
> > de Ven
> > Subject: Re: [malware-list] TALPA - a threat model? well sorta.
> >
> > On Fri, 2008-08-15 at 12:07 +0200, Helge Hafting wrote:
> > > It seems to me that this "scan on file open" business is the
> > > wrong way to do things - because it reduces performance.
> > >
> > > If you scan on file open, then your security sw is too late and
> > > getting in the way.
>
> The problem is that you have to account for the cases where the malware
> made it onto the system even if you were trying to catch it ahead of
> time. For example:
>
> - Administrator turns off or reduces AV protection for some reason for
> some period of time. It happens all the time.
>
> - New infection makes it onto the machine before the signatures have
> caught up with it. This also happens. There is an ongoing PR race
> among AV vendors about who was faster on the draw to get out signatures
> to detect some new malware. The fact that this race exists reflects
> that reality that there is some window during which new malware will
> make it onto some number of machines before the scanners catch up.
>
Not to mention removable media - it might be old hat, but infected/malware
files can come in on floppies, CDs or USB flash discs careless left on the
pavement outside an office.
--
Douglas Leeder
Sophos Plc, The Pentagon, Abingdon Science Park, Abingdon,
OX14 3YP, United Kingdom.
Company Reg No 2096520. VAT Reg No GB 348 3873 20.
next prev parent reply other threads:[~2008-08-15 13:18 UTC|newest]
Thread overview: 101+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-13 16:36 TALPA - a threat model? well sorta Eric Paris
2008-08-13 16:24 ` Alan Cox
2008-08-13 16:47 ` Eric Paris
2008-08-13 16:37 ` Alan Cox
2008-08-13 17:00 ` Eric Paris
2008-08-13 19:59 ` Alan Cox
2008-08-13 21:24 ` [malware-list] " Press, Jonathan
2008-08-13 21:13 ` Alan Cox
2008-08-13 21:35 ` Rik van Riel
2008-08-13 21:23 ` Alan Cox
2008-08-15 3:25 ` Eric Paris
2008-08-15 20:16 ` Jan Harkes
2008-08-15 22:05 ` Arjan van de Ven
2008-08-17 23:19 ` Eric Paris
2008-08-17 23:26 ` Arjan van de Ven
2008-08-17 21:11 ` David Collier-Brown
2008-08-18 15:33 ` Alan Cox
2008-08-18 16:43 ` Rik van Riel
[not found] ` <20080819071416.GA14731@elf.ucw.cz>
2008-08-19 16:10 ` HSM (was Re: [malware-list] TALPA - a threat model? well sorta.) Rik van Riel
2008-08-19 19:20 ` Pavel Machek
2008-08-19 20:33 ` Rik van Riel
2008-08-20 17:03 ` Pavel Machek
2008-08-13 17:07 ` TALPA - a threat model? well sorta Christoph Hellwig
2008-08-14 13:00 ` Arnd Bergmann
2008-08-13 16:57 ` Greg KH
2008-08-13 17:39 ` Arjan van de Ven
2008-08-13 18:15 ` Theodore Tso
2008-08-13 18:21 ` Arjan van de Ven
2008-08-14 9:18 ` tvrtko.ursulin
2008-08-13 19:02 ` Eric Paris
2008-08-13 19:29 ` Theodore Tso
2008-08-13 21:15 ` [malware-list] " Press, Jonathan
2008-08-14 9:30 ` tvrtko.ursulin
2008-08-14 12:03 ` Press, Jonathan
2008-08-14 12:27 ` tvrtko.ursulin
2008-08-15 14:31 ` Pavel Machek
2008-08-14 13:24 ` Theodore Tso
2008-08-14 13:48 ` Eric Paris
2008-08-14 15:50 ` Theodore Tso
2008-08-14 17:29 ` Eric Paris
2008-08-14 19:17 ` Theodore Tso
2008-08-14 19:20 ` Eric Paris
2008-08-14 19:34 ` Christoph Hellwig
2008-08-14 19:41 ` Theodore Tso
2008-08-14 20:20 ` Christoph Hellwig
2008-08-14 21:21 ` J. Bruce Fields
2008-08-14 23:34 ` Theodore Tso
2008-08-19 21:43 ` J. Bruce Fields
2008-08-15 1:44 ` david
2008-08-15 2:04 ` Theodore Tso
2008-08-15 3:41 ` Arjan van de Ven
2008-08-15 5:05 ` david
2008-08-15 5:12 ` Johannes Weiner
2008-08-15 5:28 ` david
2008-08-15 5:36 ` david
2008-08-15 4:48 ` david
2008-08-15 8:51 ` Alan Cox
2008-08-15 14:37 ` Pavel Machek
2008-08-13 18:57 ` Eric Paris
2008-08-13 21:39 ` Arjan van de Ven
2008-08-14 14:12 ` Eric Paris
2008-08-14 15:57 ` Arjan van de Ven
2008-08-15 10:07 ` Helge Hafting
2008-08-15 10:37 ` Peter Zijlstra
2008-08-15 13:10 ` [malware-list] " Press, Jonathan
2008-08-15 13:18 ` douglas.leeder [this message]
2008-08-15 17:04 ` Theodore Tso
2008-08-15 18:09 ` Press, Jonathan
2008-08-18 10:09 ` Helge Hafting
2008-08-18 10:14 ` Peter Zijlstra
2008-08-18 10:24 ` tvrtko.ursulin
2008-08-18 10:25 ` douglas.leeder
2008-08-15 16:25 ` david
2008-08-15 16:30 ` Press, Jonathan
2008-08-15 17:33 ` david
2008-08-15 17:40 ` Press, Jonathan
2008-08-15 17:47 ` david
2008-08-15 18:06 ` Valdis.Kletnieks
2008-08-15 20:05 ` david
2008-08-15 20:17 ` Theodore Tso
2008-08-15 18:17 ` Press, Jonathan
2008-08-15 20:08 ` david
2008-08-18 10:02 ` Helge Hafting
2008-08-15 10:44 ` tvrtko.ursulin
2008-08-14 9:46 ` [malware-list] " tvrtko.ursulin
2008-08-14 13:46 ` Arjan van de Ven
2008-08-15 1:37 ` david
2008-08-15 1:31 ` david
2008-08-15 16:06 ` Pavel Machek
2008-08-18 12:21 ` david
2008-08-18 13:30 ` Pavel Machek
2008-08-19 0:03 ` david
2008-08-13 18:17 ` Andi Kleen
2008-08-13 18:21 ` H. Peter Anvin
2008-08-13 18:24 ` Arjan van de Ven
2008-08-13 18:40 ` Eric Paris
2008-08-14 0:18 ` Mihai Donțu
2008-08-14 11:58 ` [malware-list] " Press, Jonathan
2008-08-14 12:34 ` Mihai Donțu
2008-08-14 0:14 ` 7v5w7go9ub0o
2008-08-14 2:25 ` 7v5w7go9ub0o
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