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

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Date:	Mon, 18 Aug 2008 12:43:39 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Eric Paris <eparis@...hat.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Jan Harkes <jaharkes@...cmu.edu>,
	"Press, Jonathan" <Jonathan.Press@...com>, peterz@...radead.org,
	linux-kernel@...r.kernel.org, malware-list@...ts.printk.net,
	hch@...radead.org, andi@...stfloor.org, viro@...IV.linux.org.uk
Subject: Re: [malware-list] TALPA - a threat model?  well sorta.

On Mon, 18 Aug 2008 16:33:13 +0100
Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> > I could probably buy that, but I don't know how an HSM would work.
> > Would we have everything we need at open for them to fire off?
> > 
> > /me is HSM clueless and trying to include their needs is proving a
> > challenge.
> 
> So don't bother. Its a theoretical use for the most part so we can
> mangle the interface later. 

Think of a consumer HSM application: backup to rsync.net
or Amazon S3.

Instead of waiting for the whole backup to be restored,
you can start using the filesystem immediately.  The 
block-on-open hook can be used by the restore program
to fetch files from the remote backup site on an
as-needed basis, with a full restore going on in the
background.

If the block-on-open hook can be used for that (even
with additional magic, like creating empty HSM inodes
with a special attr to notify "the data lives elsewhere"),
HSM should be good.

The "data lives elsewhere" bit/xattr/whatever could also
be used on directories, so not even the whole directory
tree would have to be restored right on restore :)

-- 
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