From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757165AbaF3Uku (ORCPT ); Mon, 30 Jun 2014 16:40:50 -0400 Received: from mga02.intel.com ([134.134.136.20]:14959 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755773AbaF3Ukr (ORCPT ); Mon, 30 Jun 2014 16:40:47 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.01,577,1400050800"; d="scan'208";a="536762965" From: Andi Kleen To: David Drysdale Cc: linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, Greg Kroah-Hartman , Alexander Viro , Meredydd Luff , Kees Cook , James Morris , linux-api@vger.kernel.org Subject: Re: [PATCH 01/11] fs: add O_BENEATH_ONLY flag to openat(2) References: <1404124096-21445-1-git-send-email-drysdale@google.com> <1404124096-21445-2-git-send-email-drysdale@google.com> Date: Mon, 30 Jun 2014 13:40:40 -0700 In-Reply-To: <1404124096-21445-2-git-send-email-drysdale@google.com> (David Drysdale's message of "Mon, 30 Jun 2014 11:28:01 +0100") Message-ID: <87mwcuw2pj.fsf@tassilo.jf.intel.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org David Drysdale writes: > Add a new O_BENEATH_ONLY flag for openat(2) which restricts the > provided path, rejecting (with -EACCES) paths that are not beneath > the provided dfd. In particular, reject: > - paths that contain .. components > - paths that begin with / > - symlinks that have paths as above. How about bind mounts? -Andi -- ak@linux.intel.com -- Speaking for myself only