From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752558AbcJCXI4 (ORCPT ); Mon, 3 Oct 2016 19:08:56 -0400 Received: from mail-ua0-f174.google.com ([209.85.217.174]:34122 "EHLO mail-ua0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751660AbcJCXIr (ORCPT ); Mon, 3 Oct 2016 19:08:47 -0400 MIME-Version: 1.0 In-Reply-To: References: From: Andy Lutomirski Date: Mon, 3 Oct 2016 16:08:24 -0700 Message-ID: Subject: Re: [PATCH 0/3] ABI CHANGE!!! Remove questionable remote SP reads To: Andy Lutomirski Cc: X86 ML , "linux-kernel@vger.kernel.org" , Brian Gerst , Borislav Petkov , Jann Horn , Linux API , Linus Torvalds , Kees Cook , Tycho Andersen Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Sep 30, 2016 at 10:58 AM, Andy Lutomirski wrote: > Jann Horn noticed that KSTK_ESP + eager task stack freeing was a bad > combination and could crash. I could very easily fix it to not > crash, but I think that using KSTK_ESP on a remote task is > questionable in general. Therefore, I propose to get rid of the > major users for 4.9. Ping! We need to decide fairly soon whether to apply these (or perhaps just patch 1 or just patches 2 and 3) for 4.9. For any parts that aren't applied, I'll send quick fixups to pin the stack in the offending code. --Andy