From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 17C4EC54FD0 for ; Mon, 27 Apr 2020 15:25:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EB9EF20661 for ; Mon, 27 Apr 2020 15:25:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728092AbgD0PZO (ORCPT ); Mon, 27 Apr 2020 11:25:14 -0400 Received: from out01.mta.xmission.com ([166.70.13.231]:34266 "EHLO out01.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727898AbgD0PZO (ORCPT ); Mon, 27 Apr 2020 11:25:14 -0400 Received: from in01.mta.xmission.com ([166.70.13.51]) by out01.mta.xmission.com with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jT5d9-0005kl-2j; Mon, 27 Apr 2020 09:25:11 -0600 Received: from ip68-227-160-95.om.om.cox.net ([68.227.160.95] helo=x220.xmission.com) by in01.mta.xmission.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.87) (envelope-from ) id 1jT5d7-00063B-DM; Mon, 27 Apr 2020 09:25:10 -0600 From: ebiederm@xmission.com (Eric W. Biederman) To: Christian Brauner Cc: linux-kernel@vger.kernel.org, Alexander Viro , =?utf-8?Q?St=C3=A9phane?= Graber , Linux Containers , Serge Hallyn , Aleksa Sarai References: <20200427143646.619227-1-christian.brauner@ubuntu.com> Date: Mon, 27 Apr 2020 10:21:55 -0500 In-Reply-To: <20200427143646.619227-1-christian.brauner@ubuntu.com> (Christian Brauner's message of "Mon, 27 Apr 2020 16:36:46 +0200") Message-ID: <87sggpeyy4.fsf@x220.int.ebiederm.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-XM-SPF: eid=1jT5d7-00063B-DM;;;mid=<87sggpeyy4.fsf@x220.int.ebiederm.org>;;;hst=in01.mta.xmission.com;;;ip=68.227.160.95;;;frm=ebiederm@xmission.com;;;spf=neutral X-XM-AID: U2FsdGVkX1+/020IQ4+UDCdVTdPpbjDBiARVtrobelw= X-SA-Exim-Connect-IP: 68.227.160.95 X-SA-Exim-Mail-From: ebiederm@xmission.com Subject: Re: [PATCH] nsproxy: attach to namespaces via pidfds X-SA-Exim-Version: 4.2.1 (built Thu, 05 May 2016 13:38:54 -0600) X-SA-Exim-Scanned: Yes (on in01.mta.xmission.com) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org I am still catching up on the what exists for pidfd. Do you have a way to safely go from a pidfd to the corresponding proc directory? That would make this setns work just an optimization. A nice one but just an optimization. Eric