linux-kernel - Re: [patch] random: make get_random

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Message-ID: <20090506204156.GB31071@waste.org>
Date:	Wed, 6 May 2009 15:41:57 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Jake Edge <jake@....net>, security@...nel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	James Morris <jmorris@...ei.org>,
	linux-security-module@...r.kernel.org,
	Eric Paris <eparis@...hat.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Roland McGrath <roland@...hat.com>, mingo@...hat.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg KH <greg@...ah.com>, Dave Jones <davej@...hat.com>
Subject: Re: [patch] random: make get_random_int() more random

On Wed, May 06, 2009 at 10:09:54PM +0200, Ingo Molnar wrote:
> I then ran the FIPS randomness test over the first 20,000 bits [2.5K 
> data], which it passed:

That's proves nothing except that you have no idea what you're talking
about. People regularly break things that FIPS gives flying colors.
FIPS is nothing but a statistical sanity-check.

Do you need this to be publicly broken again by someone who actually knows
something about cryptanalysis before you'll accept that it's a bad
idea? If so, then please move the code out of random.c, so that I
don't have to share in your embarassment a second time.

-- 
Mathematics is the supreme nostalgia of our time.
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