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

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Date:	Mon, 26 May 2008 00:39:49 +0930
From:	Glen Turner <gdt@....id.au>
To:	Chris Peterson <cpeterso@...terso.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>,
	Jeff Garzik <jeff@...zik.org>,
	"Kok, Auke" <auke-jan.h.kok@...el.com>,
	Rick Jones <rick.jones2@...com>,
	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers/net: remove network drivers' last few uses of
	IRQF_SAMPLE_RANDOM

On Fri, 2008-05-16 at 21:55 -0700, Chris Peterson wrote:
> * network drivers could use IRQF_SAMPLE_URANDOM

Is it permissable for /dev/urandom to degrade to be externally
influenced
by a hostile party?

For example, /dev/random has run out. So the output of /dev/urandom is
now
determined by previous values of /dev/random.  I then send in a stack of
network packets at regular intervals. So the output of /dev/urandom is
now greatly determined by those packets.  My search space for the
resulting
key is small since /dev/urandom appears to be random, but in fact is
periodic.

I'll also note that there is a huge number of periodic packets seen by
hosts on quiet networks -- such as a preparation VLAN where a system
administrator might choose to run up a new machine.

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