From patchwork Sun Nov 13 21:20:55 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Weinberger X-Patchwork-Id: 9425007 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 8B1BB6047D for ; Sun, 13 Nov 2016 21:27:01 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7C122288A2 for ; Sun, 13 Nov 2016 21:27:01 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 70B8928906; Sun, 13 Nov 2016 21:27:01 +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 1994B288A2 for ; Sun, 13 Nov 2016 21:27:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964851AbcKMVV7 (ORCPT ); Sun, 13 Nov 2016 16:21:59 -0500 Received: from mail.sigma-star.at ([95.130.255.111]:46004 "EHLO mail.sigma-star.at" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964819AbcKMVV6 (ORCPT ); Sun, 13 Nov 2016 16:21:58 -0500 Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.sigma-star.at (Postfix) with ESMTP id 5600924E0010; Sun, 13 Nov 2016 22:21:56 +0100 (CET) Received: from linux.site (richard.vpn.sigmapriv.at [10.3.0.5]) by mail.sigma-star.at (Postfix) with ESMTPSA id 6790224E0007; Sun, 13 Nov 2016 22:21:55 +0100 (CET) From: Richard Weinberger To: linux-mtd@lists.infradead.org Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, dedekind1@gmail.com, adrian.hunter@intel.com, tytso@mit.edu, jaegeuk@kernel.org, david@sigma-star.at, wd@denx.de, sbabic@denx.de, dengler@linutronix.de, ebiggers@google.com, mhalcrow@google.com, hch@infradead.org, Richard Weinberger Subject: [PATCH 12/29] ubifs: Implement file open operation Date: Sun, 13 Nov 2016 22:20:55 +0100 Message-Id: <1479072072-6844-13-git-send-email-richard@nod.at> X-Mailer: git-send-email 2.7.3 In-Reply-To: <1479072072-6844-1-git-send-email-richard@nod.at> References: <1479072072-6844-1-git-send-email-richard@nod.at> 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 We need ->open() for files to load the crypto key. If the no key is present and the file is encrypted, refuse to open. Signed-off-by: Richard Weinberger --- fs/ubifs/file.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c index b4fbeefba246..a9c5cc6c0bc5 100644 --- a/fs/ubifs/file.c +++ b/fs/ubifs/file.c @@ -1605,6 +1605,35 @@ static int ubifs_file_mmap(struct file *file, struct vm_area_struct *vma) return 0; } +static int ubifs_file_open(struct inode *inode, struct file *filp) +{ + int ret; + struct dentry *dir; + struct ubifs_info *c = inode->i_sb->s_fs_info; + + if (ubifs_crypt_is_encrypted(inode)) { + ret = fscrypt_get_encryption_info(inode); + if (ret) + return -EACCES; + if (!fscrypt_has_encryption_key(inode)) + return -ENOKEY; + } + + dir = dget_parent(file_dentry(filp)); + if (ubifs_crypt_is_encrypted(d_inode(dir)) && + !fscrypt_has_permitted_context(d_inode(dir), inode)) { + ubifs_err(c, "Inconsistent encryption contexts: %lu/%lu", + (unsigned long) d_inode(dir)->i_ino, + (unsigned long) inode->i_ino); + dput(dir); + ubifs_ro_mode(c, -EPERM); + return -EPERM; + } + dput(dir); + + return 0; +} + const struct address_space_operations ubifs_file_address_operations = { .readpage = ubifs_readpage, .writepage = ubifs_writepage, @@ -1647,6 +1676,7 @@ const struct file_operations ubifs_file_operations = { .unlocked_ioctl = ubifs_ioctl, .splice_read = generic_file_splice_read, .splice_write = iter_file_splice_write, + .open = ubifs_file_open, #ifdef CONFIG_COMPAT .compat_ioctl = ubifs_compat_ioctl, #endif