linux-kernel - Re: [PATCH] random: add blocking facility to urandom

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Message-ID: <1315911509.5977.1.camel@twins>
Date:	Tue, 13 Sep 2011 12:58:29 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jarod Wilson <jarod@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Steve Grubb <sgrubb@...hat.com>,
	Sandy Harris <sandyinchina@...il.com>,
	Neil Horman <nhorman@...hat.com>,
	Tomas Mraz <tmraz@...hat.com>,
	Sasha Levin <levinsasha928@...il.com>,
	Ted Ts'o <tytso@....edu>, linux-crypto@...r.kernel.org,
	Matt Mackall <mpm@...enic.com>,
	Herbert Xu <herbert.xu@...hat.com>,
	Stephan Mueller <stephan.mueller@...ec.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] random: add blocking facility to urandom

On Mon, 2011-09-12 at 09:56 -0400, Jarod Wilson wrote:
> Thomas Gleixner wrote:

> > Well, there is enough prove out there that the hardware you're using
> > is a perfect random number generator by itself.
> >
> > So stop complaining about not having access to TPM chips if you can
> > create an entropy source just by (ab)using the inherent randomness of
> > modern CPU architectures to refill your entropy pool on the fly when
> > the need arises w/o imposing completely unintuitive thresholds and
> > user visible API changes.
> 
> We started out going down that path:
> 
> http://www.mail-archive.com/linux-crypto@vger.kernel.org/msg05778.html
> 
> We hit a bit of a roadblock with it though.

Have you guys seen this work:

  http://lwn.net/images/conf/rtlws11/random-hardware.pdf


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