From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:34752) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YscrC-000611-Bj for qemu-devel@nongnu.org; Wed, 13 May 2015 16:02:19 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Yscr7-0005P3-69 for qemu-devel@nongnu.org; Wed, 13 May 2015 16:02:18 -0400 Received: from mx-v6.kamp.de ([2a02:248:0:51::16]:49318 helo=mx01.kamp.de) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Yscr6-0005Oj-Rx for qemu-devel@nongnu.org; Wed, 13 May 2015 16:02:13 -0400 Message-ID: <5553ADBF.6060005@kamp.de> Date: Wed, 13 May 2015 22:02:07 +0200 From: Peter Lieven MIME-Version: 1.0 References: <1431527602-29889-1-git-send-email-jsnow@redhat.com> <55539D17.7010000@weilnetz.de> <55539EFA.6050605@profihost.ag> <5553A07E.6070608@weilnetz.de> <5553A17D.4090308@profihost.ag> <5553A651.3060508@kamp.de> <877fsccl19.fsf@blackfin.pond.sub.org> In-Reply-To: <877fsccl19.fsf@blackfin.pond.sub.org> Content-Type: text/plain; charset=iso-8859-15 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [Qemu-stable] [PATCH] fdc: force the fifo access to be in bounds of the allocated buffer List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Markus Armbruster Cc: peter.maydell@linaro.org, Petr Matousek , Stefan Weil , qemu-devel@nongnu.org, qemu-stable@nongnu.org, John Snow Am 13.05.2015 um 21:52 schrieb Markus Armbruster: > Peter Lieven writes: > >> Am 13.05.2015 um 21:09 schrieb Stefan Priebe: >>> Am 13.05.2015 um 21:05 schrieb Stefan Weil: >>>> Am 13.05.2015 um 20:59 schrieb Stefan Priebe: >>>>> Am 13.05.2015 um 20:51 schrieb Stefan Weil: >>>>>> Hi, >>>>>> >>>>>> I just noticed this patch because my provider told me that my KVM based >>>>>> server >>>>>> needs a reboot because of a CVE (see this German news: >>>>>> http://www.heise.de/newsticker/meldung/Venom-Schwachstelle-Aus-Hypervisor-ausbrechen-und-VMs-ausspionieren-2649614.html) >>>>>> >>>>> Isn't a live migration to a fixed version enough instead of a reboot? >>>>> >>>>> Stefan >>>> Good point. A live migration would be sufficient - if there are no bugs >>>> in QEMU's live migration. >>> just migrating all our customer machines and wanted to be sure that >>> live migration is enough. >> Just to confirm: If Qemu is started with -nodefaults and there is no >> fdc configuration the system is not affected by this CVE? > Not true. The FD controller is still there. It has no drives attached > then, but is vulnerable all the same. Are you sure? With -nodefaults the hmp command 'info block' returns nothing and the guest sees no floppy drive. Without -nodefaults I indeed see floppy0 and I have /dev/fd0 in the guest respectively. Peter