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

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Date:	Thu, 14 Aug 2008 22:04:00 -0400
From:	Theodore Tso <tytso@....edu>
To:	david@...g.hm
Cc:	Christoph Hellwig <hch@...radead.org>,
	Eric Paris <eparis@...hat.com>, tvrtko.ursulin@...hos.com,
	alan@...rguk.ukuu.org.uk, andi@...stfloor.org,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, malware-list@...ts.printk.net,
	malware-list-bounces@...sg.printk.net, peterz@...radead.org,
	viro@...IV.linux.org.uk
Subject: Re: [malware-list] TALPA - a threat model?  well sorta.

On Thu, Aug 14, 2008 at 06:44:33PM -0700, david@...g.hm wrote:
> could you do something like defining a namespace inside posix attributes  
> and then setting up a mechanism in the kernel to alert if the attributes  
> change (with the entire namespace getting cleared if the file gets  
> dirtied)?

According to Eric Paris the clean/dirty state is only stored in
memory.  We could use the extended attribute interface as a way of not
defining a new system call, or some other interface, but I'm not sure
it's such a great match given that the extended attributes interface
are designed for persistent data.

I agree that doesn't actually work very well for the tracker use case,
where you the clean/dirty bit to be persistent (in case the tracker is
disabled due to the fact you are running on battery, for example, and
then you reboot).

						- Ted
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