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 14:30:46 -0400
From:	Eric Paris <eparis@...hat.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	davecb@....com, david@...g.hm, 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, 2008-08-18 at 13:54 -0400, Eric Paris wrote:
> On Mon, 2008-08-18 at 18:25 +0100, Alan Cox wrote:
> > > I think I'm going to stick with my special file in securityfs since it
> > > makes it some simple to install the fd in the scanning process (as
> > > opposed to netlink where I don't even know how it would be possible...)
> > 
> > AF_UNIX passes file handles just fine. I'm not sure netlink will help you
> > here anyway - isn't it lossy under load ?
> 
> But the file being installed needs to be at least RD for AV/Indexer.
> Particularly of interest to people here would be a file opened O_WRONLY
> and then the indexer wouldn't have the ability to read the data that was
> just written.  So we need a new FD, can't just send the old one.

Also not knowing much about sending FD's over AF_UNIX sockets, do they
share the same seek offsets or does the new process get a new fd which
points to the same data?  I wouldn't want to have to count on the
indexer to not move the offset around on the bittorrent client.  Like I
said, haven't never used sendmsg to pass a socket I don't know what you
get on the other end.

-Eric

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