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 10:38:54 -0700 (PDT)
From:	david@...g.hm
To:	Eric Paris <eparis@...hat.com>
cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, tvrtko.ursulin@...hos.com,
	Theodore Tso <tytso@....edu>, davecb@....com,
	Adrian Bunk <bunk@...nel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	malware-list@...ts.printk.net,
	Casey Schaufler <casey@...aufler-ca.com>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [malware-list] scanner interface proposal was: [TALPA]	Intro	to
 a linux interface for on access scanning

On Mon, 18 Aug 2008, Eric Paris wrote:

> On Mon, 2008-08-18 at 17:15 +0100, Alan Cox wrote:
>>> read -> we have the ALLOW/mark result bit in core set so just allow.
>>
>> Don't think we need this - SELinux can do that bit
>>
>>> mtime update -> clear ALLOW/"mark result" bit in core, send async
>>> notification to userspace
>>
>> Why via the kernel ?
>
> the single in core allow/deny bit is so that the vast majority of
> operations are completely free.  Say we scan/index /lib/ld-linux.so.2
> once.  Do you really want every single read/mmap operation from then on
> to have to block waiting for the userspace caches of you HSM, your AV
> scanner, and you indexer?  If all three tell the kernel they don't need
> to see it again and that information is easy and free to maintain, lets
> do it.

this is why the proposal caches the results of all the scanners with the 
file (in the xattrs), rather then having each scanner store it's own scan 
results

David Lang
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