From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932575Ab2DSWQJ (ORCPT ); Thu, 19 Apr 2012 18:16:09 -0400 Received: from mail-lb0-f174.google.com ([209.85.217.174]:41236 "EHLO mail-lb0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756479Ab2DSWQG (ORCPT ); Thu, 19 Apr 2012 18:16:06 -0400 Date: Fri, 20 Apr 2012 02:16:02 +0400 From: Cyrill Gorcunov To: Konstantin Khlebnikov Cc: Oleg Nesterov , "akpm@linux-foundation.org" , "keescook@chromium.org" , "kosaki.motohiro@jp.fujitsu.com" , "matthltc@us.ibm.com" , "tj@kernel.org" , Pavel Emelianov , "linux-kernel@vger.kernel.org" Subject: Re: + c-r-prctl-add-ability-to-set-new-mm_struct-exe_file-update-after-mm- num_exe_file_vmas-removal.patch added to -mm tree Message-ID: <20120419221602.GU1893@moon> References: <20120419185221.E8ED6A055E@akpm.mtv.corp.google.com> <20120419192005.GA13558@redhat.com> <20120419210033.GO1893@moon> <20120419211216.GA2200@redhat.com> <20120419213204.GP1893@moon> <4F908CEB.8090606@openvz.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4F908CEB.8090606@openvz.org> 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 On Fri, Apr 20, 2012 at 02:08:43AM +0400, Konstantin Khlebnikov wrote: > >>My question is: unless I missed something "it can't be changed again" > >>is not actually true. A task does PR_SET_MM_EXE_FILE, then it forks > >>the new child. The child can do PR_SET_MM_EXE_FILE again. Is this > >>by design? > > > >Hmm, not sure, Konstantin? > > Why not? It has new pid, why it cannot change exe_file? Actually I don't care too. > But even if we include this bit into MMF_INIT_MASK we cannot forbid exe-file change > in childs tasks which was forked before exe-file change in parent. OK, I see, thanks. Cyrill