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From: "Gilles Espinasse" <g.esp@free.fr>
To: "Theodore Tso" <tytso@MIT.EDU>, <linux-kernel@vger.kernel.org>
Cc: "Chris Peterson" <cpeterso@cpeterso.com>,
       "Alan Cox" <alan@lxorguk.ukuu.org.uk>,
       "Lennart Sorensen" <lsorense@csclub.uwaterloo.ca>,
       "Jeff Garzik" <jeff@garzik.org>, "Kok, Auke" <auke-jan.h.kok@intel.com>,
       "Rick Jones" <rick.jones2@hp.com>, "Glen Turner" <gdt@gdt.id.au>
References: <482C7E53.3050300@hp.com> <482C8184.2030906@garzik.org> <482C8550.5000909@intel.com> <482C8D4D.3040702@garzik.org> <20080516132107.GA11304@csclub.uwaterloo.ca> <20080516161029.44ded734@core> <20080516173610.GA27126@csclub.uwaterloo.ca> <20080516191125.46 <20080525232712.GF5970@mit.edu>
Subject: Re: [PATCH] drivers/net: remove network drivers' last few uses of IRQF_SAMPLE_RANDOM
Date: Mon, 26 May 2008 23:08:02 +0200
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----- Original Message ----- 
From: "Theodore Tso" <tytso@MIT.EDU>
To: "Glen Turner" <gdt@gdt.id.au>
Cc: "Chris Peterson" <cpeterso@cpeterso.com>; "Alan Cox"
<alan@lxorguk.ukuu.org.uk>; "Lennart Sorensen"
<lsorense@csclub.uwaterloo.ca>; "Jeff Garzik" <jeff@garzik.org>; "Kok, Auke"
<auke-jan.h.kok@intel.com>; "Rick Jones" <rick.jones2@hp.com>; "Brandeburg,
Jesse" <jes>
Sent: Monday, May 26, 2008 1:27 AM
Subject: Re: [PATCH] drivers/net: remove network drivers' last few uses of
IRQF_SAMPLE_RANDOM


...
>
> There is a reason why /dev/random is world-writeable; it's perfectly
> safe to write arbitary amounts of data into /dev/random.  If the
> attacker doesn't know what has been fixed into the entropy pool, his
> life just got a lot harder.  If it is the attacker mixing known data
> into the pool, it's no worse.
>
man 4 random recommand to save /dev/urandom during stop and seed
/dev/urandom at start.
For wich reason is it not recommanded to save and seed using /dev/random?

Gilles