From owner-freebsd-security@FreeBSD.ORG  Wed Oct  3 17:11:15 2012
Return-Path: <owner-freebsd-security@FreeBSD.ORG>
Delivered-To: freebsd-security@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52])
	by hub.freebsd.org (Postfix) with ESMTP id 61A7F106566C;
	Wed,  3 Oct 2012 17:11:15 +0000 (UTC) (envelope-from des@des.no)
Received: from smtp.des.no (smtp.des.no [194.63.250.102])
	by mx1.freebsd.org (Postfix) with ESMTP id 14AC78FC17;
	Wed,  3 Oct 2012 17:11:11 +0000 (UTC)
Received: from ds4.des.no (smtp.des.no [194.63.250.102])
	by smtp.des.no (Postfix) with ESMTP id 4419B6073;
	Wed,  3 Oct 2012 19:11:11 +0200 (CEST)
Received: by ds4.des.no (Postfix, from userid 1001)
	id E26D0818A; Wed,  3 Oct 2012 19:11:10 +0200 (CEST)
From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no>
To: RW <rwmaillists@googlemail.com>
References: <20120918211422.GA1400@garage.freebsd.pl>
	<20120919231051.4bc5335b@gumby.homeunix.com>
	<20120920102104.GA1397@garage.freebsd.pl>
	<201209200758.51924.jhb@freebsd.org>
	<20120922080323.GA1454@garage.freebsd.pl>
	<20120922195325.GH1454@garage.freebsd.pl> <505E59DC.7090505@gmail.com>
	<20120923151706.GN1454@garage.freebsd.pl> <5060D723.6020305@gmail.com>
	<CAG5KPzxf0Rfufk5K6Jt4e85xc7zXY_B3a2Sq0Uf_uVLHbV-baw@mail.gmail.com>
	<86r4pqqwnm.fsf@ds4.des.no> <86ipat6n0o.fsf@ds4.des.no>
	<86y5joiyan.fsf@ds4.des.no>
	<20121003011607.5553fe48@gumby.homeunix.com>
	<86txub93zo.fsf@ds4.des.no>
	<20121003145107.264e3174@gumby.homeunix.com>
Date: Wed, 03 Oct 2012 19:11:10 +0200
In-Reply-To: <20121003145107.264e3174@gumby.homeunix.com> (RW's message of
	"Wed, 3 Oct 2012 14:51:07 +0100")
Message-ID: <86iparmqfl.fsf@ds4.des.no>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.4 (berkeley-unix)
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Cc: Anderson <jonathan.anderson@cl.cam.ac.uk>,
	Pawel Jakub Dawidek <pjd@freebsd.org>,
	John Baldwin <jhb@freebsd.org>, Laurie <benl@freebsd.org>,
	Ben@FreeBSD.ORG, freebsd-security@freebsd.org,
	Mariusz Gromada <mariusz.gromada@gmail.com>, Jonathan@FreeBSD.ORG
Subject: Re: Collecting entropy from device_attach() times.
X-BeenThere: freebsd-security@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: "Security issues \[members-only posting\]"
	<freebsd-security.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-security>, 
	<mailto:freebsd-security-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-security>
List-Post: <mailto:freebsd-security@freebsd.org>
List-Help: <mailto:freebsd-security-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-security>, 
	<mailto:freebsd-security-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 03 Oct 2012 17:11:15 -0000

RW <rwmaillists@googlemail.com> writes:
> Yes, getting a monotonically increasing value from binuptime() is
> simple, but the xor issue is secondary to the problem I was referring
> to when I quoted the arm code for get_cyclecount().

BTW, I just checked - the code you quoted does not exist / no longer
exists anywhere in the tree.  The arm implementation of get_cyclecount()
uses the algorithm I suggested, with N =3D 56.

DES
--=20
Dag-Erling Sm=C3=B8rgrav - des@des.no