linux-kernel - Re: [malware-list] scanner interface proposal was: [TALPA] Intro to a linux interface for on access scanning (fwd)

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Message-Id: <20080818122003.4ACC02FE864@pmx1.sophos.com>
Date:	Mon, 18 Aug 2008 13:18:58 +0100
From:	tvrtko.ursulin@...hos.com
To:	david@...g.hm
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arjan van de Ven <arjan@...radead.org>,
	Adrian Bunk <bunk@...nel.org>, capibara@...all.nl,
	Casey Schaufler <casey@...aufler-ca.com>, davecb@....com,
	Eric Paris <eparis@...hat.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-security-module@...r.kernel.org,
	malware-list@...ts.printk.net,
	malware-list-bounces@...sg.printk.net,
	Mihai Don??u <mdontu@...defender.com>,
	Peter Dolding <oiaohm@...il.com>, Pavel Machek <pavel@...e.cz>,
	Rik van Riel <riel@...hat.com>, rmeijer@...all.nl,
	Theodore Tso <tytso@....edu>
Subject: Re: [malware-list] scanner interface proposal was: [TALPA] Intro to a linux
 interface for on access scanning (fwd)

david@...g.hm wrote on 18/08/2008 12:44:12:

> On Mon, 18 Aug 2008, tvrtko.ursulin@...hos.com wrote:
> 
> > David Lang wrote on 18/08/2008 02:25:44:
> >
> >> what is not covered by this design that is covered by the threat 
model
> > being
> >> proposed?
> >>
> >> what did I over complicate in this design? or is it the minimum 
feature
> > set
> >> needed?
> >>
> >> are any of the features I list impossible to implement?
> >
> > One more thing - this proposal does not work where there are no 
extended
> > attributes (whether at all or they are disabled at mount time). I 
think
> > that is a serious flaw or at least disadvantage compared to the posted
> > implementation.
> 
> good point. I should have listed that.
> 
> I don't see it as a serious flaw, people who care about this feature can 

> just pick an appropriate filesystem to use.

You mostly cannot pick not use vfat, isofs and udf.
 
> but if extended attributes are not found a strict implementation could 
> fall back to scanning on every file access (the extended attributes are 
> being used to cache the results of the scans)

Performance impact may or may not be acceptable but I dislike the concept 
of core security interface which is not really core.

--
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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OX14 3YP, United Kingdom.

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