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

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Message-ID: <20110907192737.GD20571@thunk.org>
Date:	Wed, 7 Sep 2011 15:27:37 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Jarod Wilson <jarod@...hat.com>
Cc:	Sasha Levin <levinsasha928@...il.com>,
	linux-crypto@...r.kernel.org, Matt Mackall <mpm@...enic.com>,
	Neil Horman <nhorman@...hat.com>,
	Herbert Xu <herbert.xu@...hat.com>,
	Steve Grubb <sgrubb@...hat.com>,
	Stephan Mueller <stephan.mueller@...ec.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] random: add blocking facility to urandom

On Wed, Sep 07, 2011 at 02:26:35PM -0400, Jarod Wilson wrote:
> We're looking for a generic solution here that doesn't require
> re-educating every single piece of userspace. And anything done in
> userspace is going to be full of possible holes -- there needs to be
> something in place that actually *enforces* the policy, and
> centralized accounting/tracking, lest you wind up with multiple
> processes racing to grab the entropy.

Yeah, but there are userspace programs that depend on urandom not
blocking... so your proposed change would break them.

	       	    	     	    	  	- Ted
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