From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755789AbbAFTAq (ORCPT ); Tue, 6 Jan 2015 14:00:46 -0500 Received: from mail.skyhub.de ([78.46.96.112]:49993 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751281AbbAFTAp (ORCPT ); Tue, 6 Jan 2015 14:00:45 -0500 Date: Tue, 6 Jan 2015 20:00:41 +0100 From: Borislav Petkov To: Andy Lutomirski Cc: Frederic Weisbecker , "linux-kernel@vger.kernel.org" , X86 ML , kvm list , Oleg Nesterov Subject: Re: [PATCH 1/3] x86_64,entry: Fix RCX for traced syscalls Message-ID: <20150106190041.GG32560@pd.tnic> References: <20059f41189ac95da62cc8b23709c0eaba168186.1415403984.git.luto@amacapital.net> <20150105125943.GC19655@pd.tnic> <20150106153429.GB32560@pd.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jan 06, 2015 at 10:43:57AM -0800, Andy Lutomirski wrote: > Sure, but the code would be simpler if we shoved that value in the > EFLAGS slot. There probably is some reason for that but it's not like we can change it :-) > Hmm. I added and pushed a test for fork, but that didn't turn > anything up. And I don't see any bugs in the code. > > I booted 3.18 plus this patch with context tracking forced on on my > laptop, and something seems to have gone wrong. Well, I ran it on -rc2 + tip/master and it did trigger sporadically yesterday but was unable to trigger something today. I'll redo the whole games tomorrow. -- Regards/Gruss, Boris. Sent from a fat crate under my desk. Formatting is fine. --