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

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Date:	Wed, 13 Aug 2008 17:24:28 -0400
From:	"Press, Jonathan" <Jonathan.Press@...com>
To:	"Alan Cox" <alan@...rguk.ukuu.org.uk>,
	"Eric Paris" <eparis@...hat.com>
Cc:	<peterz@...radead.org>, <linux-kernel@...r.kernel.org>,
	<malware-list@...ts.printk.net>, <hch@...radead.org>,
	<andi@...stfloor.org>, <viro@...IV.linux.org.uk>,
	<arjan@...radead.org>
Subject: RE: [malware-list] TALPA - a threat model?  well sorta.

> -----Original Message-----
> From: malware-list-bounces@...sg.printk.net [mailto:malware-list-
> bounces@...sg.printk.net] On Behalf Of Alan Cox
> Sent: Wednesday, August 13, 2008 3:59 PM
> To: Eric Paris
> Cc: peterz@...radead.org; linux-kernel@...r.kernel.org; malware-
> list@...ts.printk.net; hch@...radead.org; andi@...stfloor.org;
> viro@...IV.linux.org.uk; arjan@...radead.org
> Subject: Re: [malware-list] TALPA - a threat model? well sorta.
> 
> > > I don't think you need to be blocking if you passed up a file
handle ?
> >
> > Without blocking and waiting how do you deny access?  Maybe I needed
> > another thing they do.  "They do file scanning and deny access to
bad
> > files."
> 
> Denying access is easy enough - chmod it or set an SELinux label on
it.

I may be missing something about your suggestion, but I don't see how
this would work.  Who does the chmod?

Here's a sequence:

- Application opens file
- AV scanner notified in some way without blocking
- Application reads file into memory
- AV scanner determines file is infected.
- AV scanner chmod's file -- oops, too late.
- Application sends file over the wire to another machine with a more
vulnerable OS

How would this be prevented?


Jon Press
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