netdev - Re: [PATCH] Re: [PATCH] drivers/net: remove network drivers' last few uses of IRQF_SAMPLE

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Message-ID: <482DB568.1040704@firstfloor.org>
Date:	Fri, 16 May 2008 18:25:12 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Herbert Xu <herbert@...dor.apana.org.au>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>, Jeff Garzik <jeff@...zik.org>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	Chris Peterson <cpeterso@...terso.com>,
	tpmdd-devel@...ts.sourceforge.net, tpm@...horst.net
Subject: Re: [PATCH] Re: [PATCH] drivers/net: remove network drivers' last
 few uses of IRQF_SAMPLE_RANDOM

Herbert Xu wrote:
> On Fri, May 16, 2008 at 12:19:49PM +0200, Andi Kleen wrote:
>> Just think a little bit: system has no randomness source except the
>> hardware RNG. you do your strange randomness verification. if it fails
>> what do you do? You don't feed anything into your entropy pool and all
>> your  random output is predictable (just boot time)  If you add anything
>> predictable from another source it's still predictable, no difference.
> 
> You can continue to feed data into the pool even if it fails the
> test.  You just keep the entropy value same as before.

You could do that, but what advantage would it have? I don't think it's
worth running the FIPS test, or rather requiring the user land daemon
and leaving behind most of the userbase just for this.

-Andi
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