Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754796AbeAGWWb (ORCPT + 1 other); Sun, 7 Jan 2018 17:22:31 -0500 Received: from wtarreau.pck.nerim.net ([62.212.114.60]:38777 "EHLO 1wt.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754703AbeAGWW2 (ORCPT ); Sun, 7 Jan 2018 17:22:28 -0500 Date: Sun, 7 Jan 2018 23:15:43 +0100 From: Willy Tarreau To: Linus Torvalds Cc: Alexei Starovoitov , Alan Cox , Dan Williams , Linux Kernel Mailing List , linux-arch@vger.kernel.org, Andi Kleen , Arnd Bergmann , Greg Kroah-Hartman , Peter Zijlstra , Network Development , Ingo Molnar , "H. Peter Anvin" , Thomas Gleixner Subject: Re: [PATCH 06/18] x86, barrier: stop speculation for failed access_ok Message-ID: <20180107221543.GC9996@1wt.eu> References: <20180106195551.3207f75d@alans-desktop> <20180106200912.zhzdt4qmfrojeeqe@ast-mbp> <20180106202213.23e553fb@alans-desktop> <20180106211729.cp5oet3at3hyce4o@ast-mbp> <20180106230507.3547c9a0@alans-desktop> <20180107033812.awq3vz4gdkps7tix@ast-mbp> <20180107063356.GA9425@1wt.eu> <20180107201211.GA9996@1wt.eu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.6.1 (2016-04-27) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: On Sun, Jan 07, 2018 at 12:17:11PM -0800, Linus Torvalds wrote: > We need to fix the security problem, but we need to do it *without* > these braindead arguments that performance is somehow secondary. OK OK. At least we should have security by default and let people trade it against performance if they want and understand the risk. People never know when they're secure enough (security doesn't measure) but they know fairly well when they're not performant enough to take action (most often changing the machine). Willy