From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934167AbXGQRs6 (ORCPT ); Tue, 17 Jul 2007 13:48:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758639AbXGQRst (ORCPT ); Tue, 17 Jul 2007 13:48:49 -0400 Received: from ns1.suse.de ([195.135.220.2]:58190 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758920AbXGQRss (ORCPT ); Tue, 17 Jul 2007 13:48:48 -0400 From: Andi Kleen Organization: SUSE Linux Products GmbH, Nuernberg, GF: Markus Rex, HRB 16746 (AG Nuernberg) To: Jeremy Fitzhardinge Subject: Re: [PATCH] Reading the VDSO area - i386 Date: Tue, 17 Jul 2007 19:48:41 +0200 User-Agent: KMail/1.9.6 Cc: john.blackwood@ccur.com, linux-kernel@vger.kernel.org, Jeremy Fitzhardinge , Roland McGrath , bugsy@ccur.com, Andrew Morton References: <469CECFE.6060408@ccur.com> <469CF2BC.3000306@goop.org> In-Reply-To: <469CF2BC.3000306@goop.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200707171948.42054.ak@suse.de> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tuesday 17 July 2007 18:47:56 Jeremy Fitzhardinge wrote: > John Blackwood wrote: > > I was doing some tests that attempt to read the VDSO area of a > > task through either the /proc/pid/mem or ptrace(PTRACE_PEEKTEXT, > > ...) interfaces, and it seems that when the CONFIG_COMPAT_VDSO kernel > > parameter is enabled, we can no longer successfully read the VDSO area > > on i386 kernels. > > Thanks. Someone else noticed this recently, and posted a near-identical > patch. But I can't seem to find it right now... > > Andrew, Andi: do you remember something like this passing by? Yes it was from Jan Beulich. -Andi