From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753451AbaKDKB2 (ORCPT ); Tue, 4 Nov 2014 05:01:28 -0500 Received: from mail-wg0-f73.google.com ([74.125.82.73]:52790 "EHLO mail-wg0-f73.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753413AbaKDKBF (ORCPT ); Tue, 4 Nov 2014 05:01:05 -0500 From: David Drysdale To: linux-kernel@vger.kernel.org, Alexander Viro , Kees Cook , "Eric W. Biederman" Cc: Greg Kroah-Hartman , Meredydd Luff , Will Drewry , Jorge Lucangeli Obes , Ricky Zhou , Lee Campbell , Julien Tinnes , Mike Depinet , James Morris , Andy Lutomirski , Paolo Bonzini , Paul Moore , Christoph Hellwig , linux-api@vger.kernel.org, linux-security-module@vger.kernel.org, David Drysdale Subject: [PATCHv2 0/3] fs: add O_BENEATH flag to openat(2) Date: Tue, 4 Nov 2014 09:54:41 +0000 Message-Id: <1415094884-18349-1-git-send-email-drysdale@google.com> X-Mailer: git-send-email 2.1.0.rc2.206.gedb03e5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This change adds a new O_BENEATH flag for openat(2) which restricts the provided path, rejecting (with -EACCES) paths that are not beneath the provided dfd. This change was previously included as part of a larger patchset (https://lkml.org/lkml/2014/7/25/426) for Capsicum support; however, it is potentially useful as an independent change so I've pulled it out separately here. In particular, various folks from Chrome[OS] have indicated an interest in having this functionality -- when combined with a seccomp filter it allows a directory to be accessed by a sandboxed process. Changes since v1: - Don't needlessly duplicate flags [Al Viro] - Use EPERM rather than EACCES as error code [Paolo Bonzini] - Disallow nd_jump_link for O_BENEATH [Al Viro/Andy Lutomirski] - Add test of a jumped symlink (/proc/self/root) Changes since the version included in the Capsicum v2 patchset: - Add tests of normal symlinks - Fix man-page typo - Update patch to 3.17 Changes from v1 to v2 of Capsicum patchset: - renamed O_BENEATH_ONLY to O_BENEATH [Christoph Hellwig] David Drysdale (2): fs: add O_BENEATH flag to openat(2) selftests: Add test of O_BENEATH & openat(2) arch/alpha/include/uapi/asm/fcntl.h | 1 + arch/parisc/include/uapi/asm/fcntl.h | 1 + arch/sparc/include/uapi/asm/fcntl.h | 1 + fs/fcntl.c | 5 +- fs/namei.c | 43 ++++++--- fs/open.c | 4 +- include/linux/namei.h | 1 + include/uapi/asm-generic/fcntl.h | 4 + tools/testing/selftests/Makefile | 1 + tools/testing/selftests/openat/.gitignore | 3 + tools/testing/selftests/openat/Makefile | 24 +++++ tools/testing/selftests/openat/openat.c | 149 ++++++++++++++++++++++++++++++ 12 files changed, 220 insertions(+), 17 deletions(-) create mode 100644 tools/testing/selftests/openat/.gitignore create mode 100644 tools/testing/selftests/openat/Makefile create mode 100644 tools/testing/selftests/openat/openat.c -- 2.1.0.rc2.206.gedb03e5