Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753877AbdGMPyg (ORCPT ); Thu, 13 Jul 2017 11:54:36 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:38844 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753247AbdGMPo2 (ORCPT ); Thu, 13 Jul 2017 11:44:28 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Christoph Hellwig , Al Viro Subject: [PATCH 4.4 02/57] fs: completely ignore unknown open flags Date: Thu, 13 Jul 2017 17:42:17 +0200 Message-Id: <20170713153957.676879653@linuxfoundation.org> X-Mailer: git-send-email 2.13.2 In-Reply-To: <20170713153957.515045341@linuxfoundation.org> References: <20170713153957.515045341@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1007 Lines: 36 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Christoph Hellwig commit 629e014bb8349fcf7c1e4df19a842652ece1c945 upstream. Currently we just stash anything we got into file->f_flags, and the report it in fcntl(F_GETFD). This patch just clears out all unknown flags so that we don't pass them to the fs or report them. Signed-off-by: Christoph Hellwig Signed-off-by: Al Viro Signed-off-by: Greg Kroah-Hartman --- fs/open.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/fs/open.c +++ b/fs/open.c @@ -885,6 +885,12 @@ static inline int build_open_flags(int f int lookup_flags = 0; int acc_mode; + /* + * Clear out all open flags we don't know about so that we don't report + * them in fcntl(F_GETFD) or similar interfaces. + */ + flags &= VALID_OPEN_FLAGS; + if (flags & (O_CREAT | __O_TMPFILE)) op->mode = (mode & S_IALLUGO) | S_IFREG; else