Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753732AbXLDVYZ (ORCPT ); Tue, 4 Dec 2007 16:24:25 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751380AbXLDVYQ (ORCPT ); Tue, 4 Dec 2007 16:24:16 -0500 Received: from mx1.redhat.com ([66.187.233.31]:47187 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751297AbXLDVYP (ORCPT ); Tue, 4 Dec 2007 16:24:15 -0500 Message-ID: <4755C423.60907@redhat.com> Date: Tue, 04 Dec 2007 15:18:27 -0600 From: Mike McGrath User-Agent: Thunderbird 2.0.0.5 (X11/20070719) MIME-Version: 1.0 To: Matt Mackall CC: Alan Cox , Theodore Tso , 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> <20071204210827.GE19691@waste.org> In-Reply-To: <20071204210827.GE19691@waste.org> 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: 2250 Lines: 68 Matt Mackall wrote: > which would have been in v2.6.22-rc4 through the normal CVE process. > The only other bits in there are wall time and utsname, so systems > with no CMOS clock would behave repeatably. Can we find out what > kernels are affected? > > We can but it will likely take a few weeks to get a good sampling. UUID is unique in the db so when someone checks in with the same UUID, the old one gets overwritten. I'll have to do regular copies of what the UUID holds over time. Smolt schedules a monthly check in which we literally just missed a few days ago. >> We seen a huge number of duplicates for certain values: >> >> >From Mike McGrath (added to Cc) >> >> >>> 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. >>> > > Any other details would be interesting. > We'll be able to get lots of stuff. Here's a profile of whats currently in e2b67e1d-e325-4740-b938-795addb45280. u_u_id: e2b67e1d-e325-4740-b938-795addb45280 o_s: Fedora release 7.92 (Rawhide) platform: i686 bogomips: 3660.33 system_memory: 2025 system_swap: 964 vendor: Sony Corporation system: VGN-FE31Z C3LMPJWX cpu_vendor: GenuineIntel cpu_model: Intel(R) Core(TM)2 CPU T num_cp_us: 2 cpu_speed: 1833 language: en_US.UT default_runlevel: 5 kernel_version: 2.6.23.1-23.fc8 formfactor: laptop last_modified: 2007-10-02 04:22:42 rating: 3 selinux_enabled: 1 selinux_enforce: targeted I'll grab the suspect UUID profiles over time to see what we end up with. -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/