From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:59198 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751891AbeAENgv (ORCPT ); Fri, 5 Jan 2018 08:36:51 -0500 Date: Fri, 5 Jan 2018 14:36:55 +0100 From: Greg KH To: Jamie Iles Cc: aryabinin@virtuozzo.com, stable@vger.kernel.org, Borislav Petkov Subject: Re: Extra backport for 4.4.y KPTI+KASAN Message-ID: <20180105133655.GD12036@kroah.com> References: <20180105121114.5fbozlu7cxelvwa4@cedar> <20180105121507.x7yrgpw3hpo6z6tm@cedar> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180105121507.x7yrgpw3hpo6z6tm@cedar> Sender: stable-owner@vger.kernel.org List-ID: On Fri, Jan 05, 2018 at 12:15:07PM +0000, Jamie Iles wrote: > Resending with Greg's correct email address. > > On Fri, Jan 05, 2018 at 12:11:14PM +0000, Jamie Iles wrote: > > Hi Greg, > > > > When booting a 4.4.y stable-rc kernel with a fairly minimal config and > > CONFIG_KASAN=y and "nopti" on the kernel command line, or v4.4.109, I > > get a load of KASAN spews as below. A bisect takes me back to > > 85d3700c744a11 (x86/mm: If INVPCID is available, use it to flush global > > mappings), but I think the real fix is to also add 69e0210fd01ff15 > > (x86/kasan: Clear kasan_zero_page after TLB flush) onto your branch to > > address these false positives. Again, nice find! I've queued this up as well, thanks. greg k-h