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

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Message-ID: <20090516075746.4b8f3ed6@infradead.org>
Date:	Sat, 16 May 2009 07:57:46 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	lkml@...ethan.org
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Ingo Molnar <mingo@...e.hu>, Willy Tarreau <w@....eu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	security@...nel.org, Linux@...a.kernel.org, stable@...nel.org,
	Cox <alan@...rguk.ukuu.org.uk>, Arjan@...a.kernel.org,
	List <linux-kernel@...r.kernel.org>, Alan@...a.kernel.org,
	Eric Paris <eparis@...hat.com>, Jake Edge <jake@....net>,
	linux-security-module@...r.kernel.org, mingo@...hat.com,
	Matt Mackall <mpm@...enic.com>, Dave Jones <davej@...hat.com>,
	James Morris <jmorris@...ei.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Roland McGrath <roland@...hat.com>
Subject: Re: [Security] [patch] random: make get_random_int() more random

On Sat, 16 May 2009 09:28:16 -0500
"Michael S. Zick" <lkml@...ethan.org> wrote:
> 
> Still getting kernel messages that there isn't a test for the rng - -
> One (of many) ways to test the quality is to submit a bit string
> sample to the Berlekamp-Massey algorithm; perhaps from repeated calls
> to the generation function (it depends on your desired confidence
> level).
> 

or we bite the bullet and implement the Fortuna PRNG algorithm
and feed it as much as we can, rather than caring if any if the sources
is not 100.000% perfect.

-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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