From patchwork Wed Dec 12 08:17:08 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Micka=C3=ABl_Sala=C3=BCn?= X-Patchwork-Id: 10725697 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D035E1751 for ; Wed, 12 Dec 2018 08:34:34 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C35542AF33 for ; Wed, 12 Dec 2018 08:34:34 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B69152AF97; Wed, 12 Dec 2018 08:34:34 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 37B2D2AF33 for ; Wed, 12 Dec 2018 08:34:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726683AbeLLIeW (ORCPT ); Wed, 12 Dec 2018 03:34:22 -0500 Received: from smtp-sh2.infomaniak.ch ([128.65.195.6]:33456 "EHLO smtp-sh2.infomaniak.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726242AbeLLIeW (ORCPT ); Wed, 12 Dec 2018 03:34:22 -0500 Received: from smtp8.infomaniak.ch (smtp8.infomaniak.ch [83.166.132.38]) by smtp-sh.infomaniak.ch (8.14.5/8.14.5) with ESMTP id wBC8HfHl022346 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 12 Dec 2018 09:17:42 +0100 Received: from localhost (ns3096276.ip-94-23-54.eu [94.23.54.103]) (authenticated bits=0) by smtp8.infomaniak.ch (8.14.5/8.14.5) with ESMTP id wBC8Hdkr032831; Wed, 12 Dec 2018 09:17:39 +0100 From: =?utf-8?q?Micka=C3=ABl_Sala=C3=BCn?= To: linux-kernel@vger.kernel.org Cc: =?utf-8?q?Micka=C3=ABl_Sala=C3=BCn?= , Al Viro , James Morris , Jonathan Corbet , Kees Cook , Matthew Garrett , Michael Kerrisk , =?utf-8?q?Micka=C3=ABl_Sala=C3=BCn?= , Mimi Zohar , =?utf-8?q?Philippe_Tr=C3=A9buchet?= , Shuah Khan , Thibaut Sautereau , Vincent Strubel , Yves-Alexis Perez , kernel-hardening@lists.openwall.com, linux-api@vger.kernel.org, linux-security-module@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [RFC PATCH v1 1/5] fs: Add support for an O_MAYEXEC flag on sys_open() Date: Wed, 12 Dec 2018 09:17:08 +0100 Message-Id: <20181212081712.32347-2-mic@digikod.net> X-Mailer: git-send-email 2.20.0.rc2 In-Reply-To: <20181212081712.32347-1-mic@digikod.net> References: <20181212081712.32347-1-mic@digikod.net> MIME-Version: 1.0 X-Antivirus: Dr.Web (R) for Unix mail servers drweb plugin ver.6.0.2.8 X-Antivirus-Code: 0x100000 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP When the O_MAYEXEC flag is passed, sys_open() may be subject to additional restrictions depending on a security policy implemented by an LSM through the inode_permission hook. The underlying idea is to be able to restrict scripts interpretation according to a policy defined by the system administrator. For this to be possible, script interpreters must use the O_MAYEXEC flag appropriately. To be fully effective, these interpreters also need to handle the other ways to execute code (for which the kernel can't help): command line parameters (e.g., option -e for Perl), module loading (e.g., option -m for Python), stdin, file sourcing, environment variables, configuration files... According to the threat model, it may be acceptable to allow some script interpreters (e.g. Bash) to interpret commands from stdin, may it be a TTY or a pipe, because it may not be enough to (directly) perform syscalls. A simple security policy implementation is available in a following patch for Yama. This is an updated subset of the patch initially written by Vincent Strubel for CLIP OS: https://github.com/clipos-archive/src_platform_clip-patches/blob/f5cb330d6b684752e403b4e41b39f7004d88e561/1901_open_mayexec.patch This patch has been used for more than 10 years with customized script interpreters. Some examples can be found here: https://github.com/clipos-archive/clipos4_portage-overlay/search?q=O_MAYEXEC Signed-off-by: Mickaël Salaün Signed-off-by: Thibaut Sautereau Signed-off-by: Vincent Strubel Reviewed-by: Philippe Trébuchet Cc: Al Viro Cc: Kees Cook Cc: Mickaël Salaün --- fs/fcntl.c | 2 +- fs/open.c | 4 ++++ include/linux/fcntl.h | 2 +- include/linux/fs.h | 2 ++ include/uapi/asm-generic/fcntl.h | 3 +++ 5 files changed, 11 insertions(+), 2 deletions(-) diff --git a/fs/fcntl.c b/fs/fcntl.c index 083185174c6d..6c85c4d0c006 100644 --- a/fs/fcntl.c +++ b/fs/fcntl.c @@ -1031,7 +1031,7 @@ static int __init fcntl_init(void) * Exceptions: O_NONBLOCK is a two bit define on parisc; O_NDELAY * is defined as O_NONBLOCK on some platforms and not on others. */ - BUILD_BUG_ON(21 - 1 /* for O_RDONLY being 0 */ != + BUILD_BUG_ON(22 - 1 /* for O_RDONLY being 0 */ != HWEIGHT32( (VALID_OPEN_FLAGS & ~(O_NONBLOCK | O_NDELAY)) | __FMODE_EXEC | __FMODE_NONOTIFY)); diff --git a/fs/open.c b/fs/open.c index 0285ce7dbd51..75479b79a58f 100644 --- a/fs/open.c +++ b/fs/open.c @@ -974,6 +974,10 @@ static inline int build_open_flags(int flags, umode_t mode, struct open_flags *o if (flags & O_APPEND) acc_mode |= MAY_APPEND; + /* Check execution permissions on open. */ + if (flags & O_MAYEXEC) + acc_mode |= MAY_OPENEXEC; + op->acc_mode = acc_mode; op->intent = flags & O_PATH ? 0 : LOOKUP_OPEN; diff --git a/include/linux/fcntl.h b/include/linux/fcntl.h index 27dc7a60693e..1fc00cabe9ab 100644 --- a/include/linux/fcntl.h +++ b/include/linux/fcntl.h @@ -9,7 +9,7 @@ (O_RDONLY | O_WRONLY | O_RDWR | O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC | \ O_APPEND | O_NDELAY | O_NONBLOCK | O_NDELAY | __O_SYNC | O_DSYNC | \ FASYNC | O_DIRECT | O_LARGEFILE | O_DIRECTORY | O_NOFOLLOW | \ - O_NOATIME | O_CLOEXEC | O_PATH | __O_TMPFILE) + O_NOATIME | O_CLOEXEC | O_PATH | __O_TMPFILE | O_MAYEXEC) #ifndef force_o_largefile #define force_o_largefile() (BITS_PER_LONG != 32) diff --git a/include/linux/fs.h b/include/linux/fs.h index c95c0807471f..584c9329ad78 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -94,6 +94,8 @@ typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset, #define MAY_CHDIR 0x00000040 /* called from RCU mode, don't block */ #define MAY_NOT_BLOCK 0x00000080 +/* the inode is opened with O_MAYEXEC */ +#define MAY_OPENEXEC 0x00000100 /* * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond diff --git a/include/uapi/asm-generic/fcntl.h b/include/uapi/asm-generic/fcntl.h index 9dc0bf0c5a6e..cbb9425d6e7c 100644 --- a/include/uapi/asm-generic/fcntl.h +++ b/include/uapi/asm-generic/fcntl.h @@ -97,6 +97,9 @@ #define O_NDELAY O_NONBLOCK #endif +/* command execution from file is intended, check exec permissions */ +#define O_MAYEXEC 040000000 + #define F_DUPFD 0 /* dup */ #define F_GETFD 1 /* get close_on_exec */ #define F_SETFD 2 /* set/clear close_on_exec */