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

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Date:	Mon, 18 Aug 2008 18:53:32 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	davecb@....com
Cc:	tvrtko.ursulin@...hos.com, Theodore Tso <tytso@....edu>,
	Arjan van de Ven <arjan@...radead.org>,
	Adrian Bunk <bunk@...nel.org>, capibara@...all.nl,
	Casey Schaufler <casey@...aufler-ca.com>, david@...g.hm,
	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>,
	rmeijer@...all.nl
Subject: Re: [malware-list] scanner interface proposal was: [TALPA] Intro to
 a linux interface for on access scanning

>   I suspect we're saying "on close" when what's really meant is
> "opened for write". In the latter case, the notification would tell
> the user-space program to watch for changes, possibly by something as
> simple as doing a stat now and another when it gets around to 

Or more precisely perhaps "on the file becoming dirty". A program that
opens for write, computes for an hour and writes out doesn't want to load
events down until it begins writing.

I agree "on close" is inaccurate for the scanner cases and that is why
we've been talking about events + a close time event.

> deciding if it should scan the file. I see lots of room for
> user-space alternatives for change detection, depending on how much
> state it keeps. Rsync-like, perhaps?

Agreed.
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