From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756957AbaGWLdV (ORCPT ); Wed, 23 Jul 2014 07:33:21 -0400 Received: from mail-wg0-f43.google.com ([74.125.82.43]:50095 "EHLO mail-wg0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752886AbaGWLdT (ORCPT ); Wed, 23 Jul 2014 07:33:19 -0400 Date: Wed, 23 Jul 2014 12:33:14 +0100 From: Stephane Chazelas To: linux-kernel@vger.kernel.org Subject: network interfaces called "all", "default" or "config" Message-ID: <20140723113314.GA7798@chaz.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline 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 Hiya, you may want to forbid the creation of interfaces whose name is one of the special files in /proc/net and /proc/sys. I can see some characters (like space, tab, newline, slash, dot...) are alread forbidden in interface names (EINVAL), but one can do for instance: sudo ip link add link eth0 all type vlan id 2 sudo ip link add link eth0 default type vlan id 3 sudo ip link add link eth0 config type vlan id 4 Interestingly, after you add a "all" or "default", the corresponding /proc/sys/net/ipv[46]/conf/(all|default) become empty, and remain so even after you've removed the interface. Adding an interface called "config" masks /proc/net/vlan/config (tested with 3.14-1-amd64 on debian) -- Stephane