linux-kernel - Re: [patch 1/4] Add routine for generating an ID for kernel pointer

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Date:	Tue, 3 Jan 2012 01:14:39 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	bastien ROUCARIES <roucaries.bastien@...il.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
	Pavel Emelyanov <xemul@...allels.com>,
	Glauber Costa <glommer@...allels.com>,
	Andi Kleen <andi@...stfloor.org>,
	Matt Helsley <matthltc@...ibm.com>,
	Pekka Enberg <penberg@...nel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [patch 1/4] Add routine for generating an ID for kernel pointer

On Mon, Jan 02, 2012 at 01:18:13PM +0100, bastien ROUCARIES wrote:
> Le Saturday 31 December 2011 08:51:02, Cyrill Gorcunov a écrit :
> > On Fri, Dec 30, 2011 at 06:51:37PM -0500, KOSAKI Motohiro wrote:
> > ...
> > 
> > > >Guys, this become more and more complex, finally I fear someone
> > > >propose to do ideal hashing run-time ;) Maybe we can step back and
> > > >live with root-only and plain pointers here? I'm not sure who else
> > > >might need such facility except us, and if once there will be a
> > > >candidate -- we could take a look on hashing again and provide safe
> > > >hashes there. No?
> > > 
> > > But recently kernel security fashion are, we don't expose a kernel
> > > pointer at all even though the file is root only. I'm not sure how
> > > much effective such fashion. but you seems run opposite way.
> > > 
> > > I doubt user land can implement good comparison way. Why you gave up
> > > Andrew's sys_are_these_files_the_same() idea?
> 
> By memory, it seems that fuse expose kernel pointer encrypting it with tea.
> Tea is simple and quick you should get a glimpse at it.
> 

I've been advised to try aes as well with random cookie as a key.
I'll take a look once I've time to. Thanks!

	Cyrill
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