From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751304AbaGOEOc (ORCPT ); Tue, 15 Jul 2014 00:14:32 -0400 Received: from terminus.zytor.com ([198.137.202.10]:49748 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750741AbaGOEO3 (ORCPT ); Tue, 15 Jul 2014 00:14:29 -0400 Message-ID: <53C4AA97.2050105@zytor.com> Date: Mon, 14 Jul 2014 21:14:15 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: Andy Lutomirski CC: Konrad Rzeszutek Wilk , "linux-kernel@vger.kernel.org" Subject: Re: Is espfix64's double-fault thing OK on Xen? References: <53C40D83.3090501@zytor.com> <53C45857.6050605@zytor.com> In-Reply-To: X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/14/2014 07:46 PM, Andy Lutomirski wrote: > > On espfix-less kernels (Xen and non-Xen), 16-bit CS w/ 16-bit SS > always fails. Native (32-bit or 64-bit, according to the binary) CS > with 16-bit SS fails for sigreturn_32, but passes for sigreturn_64. I > find this somewhat odd. Native ss always passes. > espfix32 is disabled on Xen. -hpa