Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966020AbeAJRHn (ORCPT + 1 other); Wed, 10 Jan 2018 12:07:43 -0500 Received: from twosheds.infradead.org ([90.155.92.209]:35032 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965536AbeAJRHl (ORCPT ); Wed, 10 Jan 2018 12:07:41 -0500 Message-ID: <1515604047.22302.218.camel@infradead.org> Subject: Re: [PATCH 3/8] kvm: vmx: pass MSR_IA32_SPEC_CTRL and MSR_IA32_PRED_CMD down to the guest From: David Woodhouse To: Liran Alon Cc: jmattson@google.com, konrad.wilk@oracle.com, x86@kernel.org, nadav.amit@gmail.com, bp@alien8.de, arjan@linux.intel.com, aliguori@amazon.com, thomas.lendacky@amd.com, rkrcmar@redhat.com, pbonzini@redhat.com, linux-kernel@vger.kernel.org, kvm@vger.kernel.org In-Reply-To: <06779fe6-7ab6-4906-a66c-2466d03877e0@default> References: <06779fe6-7ab6-4906-a66c-2466d03877e0@default> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-RKtkKJxcg/WecxBhsJpd" Date: Wed, 10 Jan 2018 17:07:27 +0000 Mime-Version: 1.0 X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 X-SRS-Rewrite: SMTP reverse-path rewritten from by twosheds.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: --=-RKtkKJxcg/WecxBhsJpd Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2018-01-10 at 08:51 -0800, Liran Alon wrote: >=20 > Hmm... This is exactly how Google Project-Zero PoC leaks kvm- > intel.ko, kvm.ko & vmlinux... > See section "Locating the host kernel" here: > https://googleprojectzero.blogspot.co.il/2018/01/reading-privileged-m > emory-with-side.html >=20 > This was an important primitive in order for them to actually launch > the attack of reading host's memory pages. As they needed the > hypervisor addresses such that they will be able to later poison the > BTB/BHB to gadgets residing in known host addresses. Ah, joy. I'm not sure that leak is being plugged. Even setting IBRS=3D1 when entering the guest isn't guaranteed to plug it, as it's only defined to prevent predictions from affecting a *more* privileged prediction mode than they were 'learned' in. Maybe IBPB would suffice? 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