From owner-freebsd-security@FreeBSD.ORG Thu Sep 27 10:15:22 2012 Return-Path: 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 504E4106566C; Thu, 27 Sep 2012 10:15:22 +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 BF8758FC0A; Thu, 27 Sep 2012 10:15:21 +0000 (UTC) Received: from ds4.des.no (smtp.des.no [194.63.250.102]) by smtp.des.no (Postfix) with ESMTP id E303968ED; Thu, 27 Sep 2012 12:15:20 +0200 (CEST) Received: by ds4.des.no (Postfix, from userid 1001) id 993968386; Thu, 27 Sep 2012 12:15:20 +0200 (CEST) From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= To: Ben Laurie References: <20120918211422.GA1400@garage.freebsd.pl> <20120919192836.3a60cdfd@gumby.homeunix.com> <863923pzgi.fsf@ds4.des.no> Date: Thu, 27 Sep 2012 12:15:20 +0200 In-Reply-To: (Ben Laurie's message of "Thu, 27 Sep 2012 10:56:24 +0100") Message-ID: <86y5jvojpj.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: freebsd-security@freebsd.org, RW 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 \[members-only posting\]" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 27 Sep 2012 10:15:22 -0000 Ben Laurie writes: > We should certainly see how things look on slow systems, but note that > if the resolution is lower, then the measurements will also be smaller > (assuming attachment takes similar time), and so we will claim less > entropy anyway :-) Ah, I forgot about Pawel's flsl() trick. You're right. DES --=20 Dag-Erling Sm=C3=B8rgrav - des@des.no