From owner-freebsd-security@FreeBSD.ORG Thu Sep 20 06:54:58 2012 Return-Path: Delivered-To: freebsd-security@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id CF75A106564A; Thu, 20 Sep 2012 06:54:58 +0000 (UTC) (envelope-from jonathan@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2001:4f8:fff6::28]) by mx1.freebsd.org (Postfix) with ESMTP id B4F308FC0C; Thu, 20 Sep 2012 06:54:58 +0000 (UTC) Received: from [::8047:d913:100:0] (localhost [127.0.0.1]) by freefall.freebsd.org (8.14.5/8.14.5) with ESMTP id q8K6svbE059309; Thu, 20 Sep 2012 06:54:58 GMT (envelope-from jonathan@FreeBSD.org) Date: Thu, 20 Sep 2012 07:54:57 +0100 From: Jonathan Anderson To: Ben Laurie Message-ID: <5C632384458A495ABD1EDF8A9A55A3E1@FreeBSD.org> In-Reply-To: References: <20120918211422.GA1400@garage.freebsd.pl> X-Mailer: sparrow 1.6.4 (build 1176) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Content-Disposition: inline X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: freebsd-security@FreeBSD.org, Pawel Jakub Dawidek 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, 20 Sep 2012 06:54:58 -0000 On Wednesday, 19 September 2012 at 20:47, Ben Laurie wrote: > Erring on the side of underestimation is wise here. I agree wholeheartedly, but underestimation means "calculating the correct value and then applying a safety factor" rather than "picking an arbitrary number and hoping it's low enough". It seems like later posts in this thread are starting to push in the mathematically-rigorous direction; I shall go reply to those as well. :) Jon -- Jonathan Anderson jonathan@FreeBSD.org (mailto:jonathan@FreeBSD.org)