linux-kernel - Re: Seeding /dev/random not working

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Message-ID: <p73zm3nefcc.fsf@bingen.suse.de>
Date:	29 May 2007 18:58:59 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"M Macnair" <mmacnair@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Seeding /dev/random not working

"M Macnair" <mmacnair@...il.com> writes:
> 
> Many distros ship with an init script that saves and restores the
> entropy pool on startup and shutdown.  The bit that interests me that
> is called on startup is (my comments):
> 	if [ -f $random_seed ]; then
> 		cat $random_seed >/dev/urandom  # should seed the pool
.OA
Writing doesn't actually work; to get real accounted entropy for /dev/random
you need to use a special ioctl. I ran into this problem some years ago 
and ended up writing http://www.muc.de/~ak/rndfeed.c

-Andi
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