Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754069AbXLDUxs (ORCPT ); Tue, 4 Dec 2007 15:53:48 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754952AbXLDUx1 (ORCPT ); Tue, 4 Dec 2007 15:53:27 -0500 Received: from mx1.redhat.com ([66.187.233.31]:55445 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754430AbXLDUx0 (ORCPT ); Tue, 4 Dec 2007 15:53:26 -0500 Message-ID: <4755BD0C.2060808@redhat.com> Date: Tue, 04 Dec 2007 14:48:12 -0600 From: Mike McGrath User-Agent: Thunderbird 2.0.0.5 (X11/20070719) MIME-Version: 1.0 To: Alan Cox CC: Theodore Tso , Matt Mackall , Ray Lee , Adrian Bunk , Marc Haber , linux-kernel@vger.kernel.org Subject: Re: Why does reading from /dev/urandom deplete entropy so much? References: <20071204114125.GA17310@torres.zugschlus.de> <20071204161811.GB15974@stusta.de> <2c0942db0712040854u17a830b9see663742b2716457@mail.gmail.com> <20071204165502.0a8f695e@the-village.bc.nu> <20071204180237.GU19691@waste.org> <20071204195021.GB7259@thunk.org> <20071204204036.484f11ac@the-village.bc.nu> In-Reply-To: <20071204204036.484f11ac@the-village.bc.nu> Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1196 Lines: 30 Alan Cox wrote: >> Here's the top 5: >> >> 266 28caf2c3-9766-4fe1-9e4c-d6b0ba8a0132 >> 336 810e7126-1c69-4aff-b8b1-9db0fa8aa15a >> 402 c8dbb9d3-a9bd-4ba6-b92e-4a294ba5a95f >> 884 06e84493-e024-44b1-9b32-32d78af04039 >> 931 e2b67e1d-e325-4740-b938-795addb45280 >> >> The left number is times this month someone has submitted a profile with >> that UUID. If we take the last one as an example has come from over 800 >> IP's in the last 20 days. It seems very unlikely that one person would >> find his way to 800 different IP's this month. Let me know if you'd >> like more. >> Background - Smolt runs this during its install: /bin/cat /proc/sys/kernel/random/uuid > /etc/sysconfig/hw-uuid For most users this would be run by the RPM %post scripts during install from anaconda. For some reason there are some UUID's (like those listed above) that come up more often then it seems they should if they are truly random. -Mike -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/