Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756044AbaDLTpY (ORCPT ); Sat, 12 Apr 2014 15:45:24 -0400 Received: from terminus.zytor.com ([198.137.202.10]:56319 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754798AbaDLTpV (ORCPT ); Sat, 12 Apr 2014 15:45:21 -0400 User-Agent: K-9 Mail for Android In-Reply-To: <20140412193541.GA30697@pd.tnic> References: <6f5f98f2-aa96-433f-9ee8-5ba216624957@email.android.com> <20140412193541.GA30697@pd.tnic> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Subject: Re: [tip:x86/urgent] x86-64, modify_ldt: Ban 16-bit segments on 64-bit kernels From: "H. Peter Anvin" Date: Sat, 12 Apr 2014 12:44:42 -0700 To: Borislav Petkov CC: Brian Gerst , Linus Torvalds , Ingo Molnar , Linux Kernel Mailing List , Thomas Gleixner , stable , "H. Peter Anvin" Message-ID: <21a22ace-fbc3-4f97-a277-9cdf4f2253eb@email.android.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Run a 32-bit VM. The 32-bit kernel does this right. I suspect it would also work fine in a Qemu user mode guest (is this supported by KVM?), in a ReactOS VM, or some other number of combinations. The real question is how many real users are actually affected. On April 12, 2014 12:35:41 PM PDT, Borislav Petkov wrote: >On Sat, Apr 12, 2014 at 10:18:25AM -0700, H. Peter Anvin wrote: >> So Wine regressed and noone noticed? They doesn't sound like an >active >> user base. > >Btw, wouldn't this obscure use case simply work in a KVM guest with a >kernel <= 3.14? > >Because if so, we simply cut it at 3.14, everything newer has the leak >fix and people who still want to play phone games on a x86 machine, can >do so in a guest with an older kernel. Everybody's happy. -- Sent from my mobile phone. Please pardon brevity and lack of formatting. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/