linux-kernel - Re: [malware-list] [RFC 0/5] [TALPA] Intro to a linux interface for on access scanning

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Date:	Tue, 5 Aug 2008 21:36:59 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Greg KH <greg@...ah.com>
Cc:	Eric Paris <eparis@...hat.com>, malware-list@...ts.printk.net,
	linux-kernel@...r.kernel.org
Subject: Re: [malware-list] [RFC 0/5] [TALPA] Intro to a linux interface for
 on access scanning

On Tue, 5 Aug 2008 10:01:43 -0700
Greg KH <greg@...ah.com> wrote:

> On Tue, Aug 05, 2008 at 12:25:03PM +0100, Alan Cox wrote:
> > > Again, do it all in userspace (caching, and scanning).  I still really
> > > don't see the need to do this in the kernel becides it being "the way
> > > people have always done it."
> > 
> > We don't have notifiers for file segment changes that are scalable that
> > far.
> 
> I agree, but if we did, would that help out a lot here?  Lots of other
> groups of people are needing/asking for something like this and if
> someone can finally get it together to post something useful, that might
> be a very good thing.

A scalable notification scheme would certainly sort out content indexing
systems more nicely. Open notifiers that scale let you do path indexing
("People who opened file X also opened file Y" - both for optimising disk
layouts and for application level 'what do I prompt the user with' stuff)

The only thing  I can see that is actually needed to get the whole thing
working sweetly even for the virus and HSM cases is an LSM willing to
bounce some opens via a user space helper. Even without that you could
label content 'dubious' on close and relabel it accordingly in the
asynchronous scanning app

Alan
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