From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932263AbWEHDA2 (ORCPT ); Sun, 7 May 2006 23:00:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932265AbWEHDA2 (ORCPT ); Sun, 7 May 2006 23:00:28 -0400 Received: from waste.org ([64.81.244.121]:37054 "EHLO waste.org") by vger.kernel.org with ESMTP id S932263AbWEHDA2 (ORCPT ); Sun, 7 May 2006 23:00:28 -0400 Date: Sun, 7 May 2006 21:55:29 -0500 From: Matt Mackall To: Theodore Tso , Thiago Galesi , linux-kernel@vger.kernel.org Subject: Re: [PATCH 7/14] random: Remove SA_SAMPLE_RANDOM from network drivers Message-ID: <20060508025529.GQ15445@waste.org> References: <20060505203436.GW15445@waste.org> <20060506115502.GB18880@thunk.org> <20060506164808.GY15445@waste.org> <20060506.170810.74552888.davem@davemloft.net> <20060507045920.GH15445@waste.org> <82ecf08e0605070613o7b217a2bw4c71c3a8c33bed28@mail.gmail.com> <20060507160013.GM15445@waste.org> <20060508001333.GA17138@thunk.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20060508001333.GA17138@thunk.org> User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sun, May 07, 2006 at 08:13:33PM -0400, Theodore Tso wrote: > But in answer to your question, what should we do, my suggestion would > be to sample all interrupts, and calculate the estimated entropy > credits as we to day, but scaled by an amount that can range from 0 to > 100%. I actually posted a patch to add a sysctl to do exactly that a few years ago. > But for most normal/modern platforms, I would argue the default > scaling factor should be 100%. And I would argue it should be no more than 50%. Just because I've seen so many would-have-thought-they-were-impossible attacks pan out. -- Mathematics is the supreme nostalgia of our time.