From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:60050 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753041AbdJPQGq (ORCPT ); Mon, 16 Oct 2017 12:06:46 -0400 Subject: Patch "KVM: nVMX: update last_nonleaf_level when initializing nested EPT" has been added to the 4.13-stable tree To: lprosek@redhat.com, gregkh@linuxfoundation.org, pbonzini@redhat.com Cc: , From: Date: Mon, 16 Oct 2017 18:06:54 +0200 Message-ID: <1508170014199245@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled KVM: nVMX: update last_nonleaf_level when initializing nested EPT to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: kvm-nvmx-update-last_nonleaf_level-when-initializing-nested-ept.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From fd19d3b45164466a4adce7cbff448ba9189e1427 Mon Sep 17 00:00:00 2001 From: Ladi Prosek Date: Thu, 5 Oct 2017 11:10:22 +0200 Subject: KVM: nVMX: update last_nonleaf_level when initializing nested EPT From: Ladi Prosek commit fd19d3b45164466a4adce7cbff448ba9189e1427 upstream. The function updates context->root_level but didn't call update_last_nonleaf_level so the previous and potentially wrong value was used for page walks. For example, a zero value of last_nonleaf_level would allow a potential out-of-bounds access in arch/x86/mmu/paging_tmpl.h's walk_addr_generic function (CVE-2017-12188). Fixes: 155a97a3d7c78b46cef6f1a973c831bc5a4f82bb Signed-off-by: Ladi Prosek Signed-off-by: Paolo Bonzini Signed-off-by: Greg Kroah-Hartman --- arch/x86/kvm/mmu.c | 1 + 1 file changed, 1 insertion(+) --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -4459,6 +4459,7 @@ void kvm_init_shadow_ept_mmu(struct kvm_ update_permission_bitmask(vcpu, context, true); update_pkru_bitmask(vcpu, context, true); + update_last_nonleaf_level(vcpu, context); reset_rsvds_bits_mask_ept(vcpu, context, execonly); reset_ept_shadow_zero_bits_mask(vcpu, context, execonly); } Patches currently in stable-queue which might be from lprosek@redhat.com are queue-4.13/kvm-nvmx-update-last_nonleaf_level-when-initializing-nested-ept.patch queue-4.13/kvm-mmu-always-terminate-page-walks-at-level-1.patch