From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f41.google.com ([209.85.220.41]:33479 "EHLO mail-pa0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751832AbbKKAjl (ORCPT ); Tue, 10 Nov 2015 19:39:41 -0500 Received: by pabfh17 with SMTP id fh17so13156777pab.0 for ; Tue, 10 Nov 2015 16:39:41 -0800 (PST) Date: Tue, 10 Nov 2015 16:39:39 -0800 From: Venkatesh Srinivas To: Paolo Bonzini Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, digitaleric@google.com, stable@vger.kernel.org Subject: Re: [PATCH 1/3] KVM: x86: work around infinite loop in microcode when #AC is delivered Message-ID: <20151111003939.GA31855@google.com> References: <1447158174-10484-1-git-send-email-pbonzini@redhat.com> <1447158174-10484-2-git-send-email-pbonzini@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1447158174-10484-2-git-send-email-pbonzini@redhat.com> Sender: stable-owner@vger.kernel.org List-ID: On Tue, Nov 10, 2015 at 01:22:52PM +0100, Paolo Bonzini wrote: > From: Eric Northup > > It was found that a guest can DoS a host by triggering an infinite > stream of "alignment check" (#AC) exceptions. This causes the > microcode to enter an infinite loop where the core never receives > another interrupt. The host kernel panics pretty quickly due to the > effects (CVE-2015-5307). > > Signed-off-by: Eric Northup > Cc: stable@vger.kernel.org > Signed-off-by: Paolo Bonzini Tested-by: Venkatesh Srinivas -- vs;