Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754475Ab2FRI63 (ORCPT ); Mon, 18 Jun 2012 04:58:29 -0400 Received: from mail-lb0-f174.google.com ([209.85.217.174]:60724 "EHLO mail-lb0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753928Ab2FRI61 (ORCPT ); Mon, 18 Jun 2012 04:58:27 -0400 Date: Mon, 18 Jun 2012 12:58:22 +0400 From: Cyrill Gorcunov To: Konstantin Khlebnikov , Andrew Morton Cc: Kees Cook , Pavel Emelianov , "linux-kernel@vger.kernel.org" , Oleg Nesterov , "linux-mm@kvack.org" , Matt Helsley , KOSAKI Motohiro , Tejun Heo Subject: Re: [PATCH 3.5] c/r: prctl: less paranoid prctl_set_mm_exe_file() Message-ID: <20120618085822.GA8304@moon> References: <20120616085104.14682.16723.stgit@zurg> <20120616090646.GD32029@moon> <20120616091712.GA2021@moon> <4FDC54FF.3020305@openvz.org> <20120616094714.GF32029@moon> <4FDCA875.6040905@openvz.org> <20120616154424.GG32029@moon> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120616154424.GG32029@moon> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1236 Lines: 30 On Sat, Jun 16, 2012 at 07:44:24PM +0400, Cyrill Gorcunov wrote: > On Sat, Jun 16, 2012 at 07:38:29PM +0400, Konstantin Khlebnikov wrote: > > >Yeah, you've changed !path_equal to path_equal. And yes, getting rid of > > >num_exe_file_vmas is good idea. Btw, Konstantin, why do we need to > > >call for path_equal? Maybe we can simply test for mm->exe_file == NULL, > > >and refuse to change anything if it's not nil value? This will simplify > > >the code. > > > > After removing VM_EXECUTABLE and mm->num_exe_file_vmas mm->exe_file > > will never becomes NULL automatically. Patch for this not commited yet, > > but I hope it will be in 3.6. > > OK, lets stick with current patch then. To clarify Tested-by: Cyrill Gorcunov Andrew, could you please pick up this bugfix. It's critical for us. P.S. Together with patch https://lkml.org/lkml/2012/6/15/220 it'll be last changes to prctl in a sake of c/r I think. Would be cool to have both bugfixes in 3.5. Cyrill -- 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/