Received: by 2002:ac0:946b:0:0:0:0:0 with SMTP id j40csp4091691imj; Tue, 19 Feb 2019 15:17:41 -0800 (PST) X-Google-Smtp-Source: AHgI3IYW1sqW3XJ6xiZMbdYeAy9bwXUPAepiLurIeqizfQUvi2F96okLSnX51iq6Dm7MPdopFiH6 X-Received: by 2002:a17:902:1101:: with SMTP id d1mr540777pla.19.1550618261829; Tue, 19 Feb 2019 15:17:41 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1550618261; cv=none; d=google.com; s=arc-20160816; b=eFQA6Gx8HtSaANmDMirOGwYsWi6RGCPqxuo+X1b6xZ+yHaqT0JHrWQfvTLmAYmIQlA FVTnhkHD9FW4nniEpYlbS7OBiCRAkTrr+WcBefM2k9+MziSIxwcVdf2TEAeRfk3DesIS bDXTAOyhGaeLVsGM2Z3RNcYltuKVtbLTjdwYK1GEuMgRCP9FEpwUfhs4IdMaHnxq2Lmc rlKqTXil0KWMzWsHX3xa2WZei5Z/60FW9H+WCm7MEaUkjfvl224OnmD8vXj+rITiA6w+ OUG6Or6PehvEnCtgAXOrsC5vi46PbktXxsr3HdSdQHsmNlLDLRfk8YL9mTgRVfSAAM6E 8EJg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:message-id:date:content-id:mime-version :subject:cc:to:references:in-reply-to:from:organization; bh=g4lt367y2QnFhXuKGuwsvFXKiB8O7ZwGam4SZmlaBkE=; b=c2cyY/VkuBUiVYmgpvWjDyDmX2fQRQ4rVdk7z4xlKKdXz/jxXzR1JkJtTmGGFvrbPU wPaWmMR8l2kOOPeraVhwpZsZRmPGQZoYEQFp/IauFIYoEhjIEbdwkdyPD0Mpc/gY4NuE wUP0exNwULyDMjR36RzIZrecU/N7+Uu7jg6A2yFrrbnKGR7JEBwTJ/de8wS9BzGgPdBF qCGhGGXGHo/hvU6TlKz9jbTqrx/TJ2HWhakFTT27NE4bvH5oQmWt4j3BeN1MOy5aVaje on5ngbv21karlyx40/bKh7t/8v2y7QD4u8a8WMEFv52o3xW0HiZwPEHI9Wek0imwenKF etKA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id o28si17325713pgm.238.2019.02.19.15.17.26; Tue, 19 Feb 2019 15:17:41 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728832AbfBSXRF (ORCPT + 99 others); Tue, 19 Feb 2019 18:17:05 -0500 Received: from mx1.redhat.com ([209.132.183.28]:44532 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726405AbfBSXRF (ORCPT ); Tue, 19 Feb 2019 18:17:05 -0500 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id C19938046D; Tue, 19 Feb 2019 23:17:04 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-121-129.rdu2.redhat.com [10.10.121.129]) by smtp.corp.redhat.com (Postfix) with ESMTP id 37282600C0; Tue, 19 Feb 2019 23:17:00 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: <87tvgzwx4i.fsf@xmission.com> References: <87tvgzwx4i.fsf@xmission.com> <155024683432.21651.14153938339749694146.stgit@warthog.procyon.org.uk> <155024686966.21651.5963892339360034863.stgit@warthog.procyon.org.uk> To: ebiederm@xmission.com (Eric W. Biederman) Cc: dhowells@redhat.com, keyrings@vger.kernel.org, trond.myklebust@hammerspace.com, sfrench@samba.org, linux-security-module@vger.kernel.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, linux-fsdevel@vger.kernel.org, rgb@redhat.com, linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH 04/27] containers: Allow a process to be forked into a container MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <20294.1550618219.1@warthog.procyon.org.uk> Date: Tue, 19 Feb 2019 23:16:59 +0000 Message-ID: <20295.1550618219@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Tue, 19 Feb 2019 23:17:05 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Eric W. Biederman wrote: > > Further attempts to fork into the container will be rejected. > > There are no technical reasons to disallow this, and may good practical > reasons to allow this. Fair enough; that can be done. Could even emulate /sbin/request-key upcalling that way, with the manager spawning the daemon into the container with it. > So you are breaking nsenter, and it's like. It shouldn't stop nsenter() from working. David