From patchwork Sun Jul 21 21:31:07 2019 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: 11051207 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 8964113BD for ; Sun, 21 Jul 2019 21:32:51 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 79DA52847E for ; Sun, 21 Jul 2019 21:32:51 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6D30228514; Sun, 21 Jul 2019 21:32:51 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham 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 50F862847E for ; Sun, 21 Jul 2019 21:32:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726320AbfGUVct (ORCPT ); Sun, 21 Jul 2019 17:32:49 -0400 Received: from smtp-sh2.infomaniak.ch ([128.65.195.6]:55905 "EHLO smtp-sh2.infomaniak.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726287AbfGUVct (ORCPT ); Sun, 21 Jul 2019 17:32:49 -0400 Received: from smtp7.infomaniak.ch (smtp7.infomaniak.ch [83.166.132.30]) by smtp-sh2.infomaniak.ch (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id x6LLVU5D253757 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sun, 21 Jul 2019 23:31:30 +0200 Received: from localhost (ns3096276.ip-94-23-54.eu [94.23.54.103]) (authenticated bits=0) by smtp7.infomaniak.ch (8.14.5/8.14.5) with ESMTP id x6LLVRN8069488; Sun, 21 Jul 2019 23:31:28 +0200 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?= , Alexander Viro , Alexei Starovoitov , Andrew Morton , Andy Lutomirski , Arnaldo Carvalho de Melo , Casey Schaufler , Daniel Borkmann , David Drysdale , "David S . Miller" , "Eric W . Biederman" , James Morris , Jann Horn , John Johansen , Jonathan Corbet , Kees Cook , Michael Kerrisk , =?utf-8?q?Micka=C3=ABl_Sala=C3=BC?= =?utf-8?q?n?= , Paul Moore , Sargun Dhillon , "Serge E . Hallyn" , Shuah Khan , Stephen Smalley , Tejun Heo , Tetsuo Handa , Thomas Graf , Tycho Andersen , Will Drewry , kernel-hardening@lists.openwall.com, linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-security-module@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH bpf-next v10 01/10] fs,security: Add a new file access type: MAY_CHROOT Date: Sun, 21 Jul 2019 23:31:07 +0200 Message-Id: <20190721213116.23476-2-mic@digikod.net> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190721213116.23476-1-mic@digikod.net> References: <20190721213116.23476-1-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: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP For compatibility reason, MAY_CHROOT is always set with MAY_CHDIR. However, this new flag enable to differentiate a chdir form a chroot. This is needed for the Landlock LSM to be able to evaluate a new root directory. Signed-off-by: Mickaël Salaün Cc: Alexander Viro Cc: Casey Schaufler Cc: James Morris Cc: John Johansen Cc: Kees Cook Cc: Paul Moore Cc: "Serge E. Hallyn" Cc: Stephen Smalley Cc: Tetsuo Handa Cc: linux-fsdevel@vger.kernel.org --- fs/open.c | 3 ++- include/linux/fs.h | 1 + 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/open.c b/fs/open.c index b5b80469b93d..e8767318fd03 100644 --- a/fs/open.c +++ b/fs/open.c @@ -494,7 +494,8 @@ int ksys_chroot(const char __user *filename) if (error) goto out; - error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR); + error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR | + MAY_CHROOT); if (error) goto dput_and_out; diff --git a/include/linux/fs.h b/include/linux/fs.h index 75f2ed289a3f..7a0d92b1da85 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -99,6 +99,7 @@ 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 +#define MAY_CHROOT 0x00000100 /* * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond