From mboxrd@z Thu Jan 1 00:00:00 1970 From: Antoine Martin Subject: local guest DoS binary Date: Fri, 31 Jul 2009 22:51:15 +0700 Message-ID: <4A7312F3.1000201@nagafix.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit To: "kvm@vger.kernel.org" Return-path: Received: from mamba.nagafix.co.uk ([194.145.196.68]:38589 "EHLO mail.nagafix.co.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751860AbZGaPvV (ORCPT ); Fri, 31 Jul 2009 11:51:21 -0400 Received: (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: antoine@nagafix.co.uk) by mail.nagafix.co.uk (Postfix) with ESMTPSA id B620766A1 for ; Fri, 31 Jul 2009 16:51:19 +0100 (BST) Sender: kvm-owner@vger.kernel.org List-ID: -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Hi list, I was just testing some old builds and managed to freeze the guest I was testing on... Totally repeatable. Running the same binary on a kernel not running in KVM does not cause the lockup. Guest: # uname -a Linux virtual.nagafix.co.uk 2.6.30.4 #4 SMP Fri Jul 31 07:40:18 BST 2009 x86_64 QEMU Virtual CPU version 0.10.50 GenuineIntel GNU/Linux Host: # uname -r 2.6.29.4 # qemu --version QEMU PC emulator version 0.10.50 (qemu-kvm-devel-87), Copyright (c) 2003-2008 Fabrice Bellard Here is how you can reproduce it (in the guest): wget http://uml.nagafix.co.uk/uml/kernels/kernel32-2.6.16.62.bz2 bunzip2 kernel32-2.6.16.62.bz2 ./kernel32-2.6.16.62 Sorry, I haven't had time to look into what is causing this system freeze. Cheers Antoine -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEAREKAAYFAkpzEvIACgkQGK2zHPGK1rs0UQCcDM1st34vd4Nu7UmtKjiINCrH oNUAnAzAnrBALD/FmT7eLqdRE/cWj7Iu =RHQE -----END PGP SIGNATURE-----