Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756759AbcCBSdM (ORCPT ); Wed, 2 Mar 2016 13:33:12 -0500 Received: from mail.kernel.org ([198.145.29.136]:48500 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756571AbcCBScL (ORCPT ); Wed, 2 Mar 2016 13:32:11 -0500 From: Jaegeuk Kim To: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, tytso@mit.edu Cc: Jaegeuk Kim Subject: [PATCH 09/10] f2fs crypto: sync ext4_lookup and ext4_file_open Date: Wed, 2 Mar 2016 10:31:17 -0800 Message-Id: <1456943478-11107-10-git-send-email-jaegeuk@kernel.org> X-Mailer: git-send-email 2.6.3 In-Reply-To: <1456943478-11107-1-git-send-email-jaegeuk@kernel.org> References: <1456943478-11107-1-git-send-email-jaegeuk@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2727 Lines: 87 This patch tries to catch up with lookup and open policies in ext4. Signed-off-by: Jaegeuk Kim --- fs/f2fs/dir.c | 2 +- fs/f2fs/file.c | 4 ++++ fs/f2fs/namei.c | 23 +++++++++++++++++++++++ 3 files changed, 28 insertions(+), 1 deletion(-) diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c index f82e28b..479467e 100644 --- a/fs/f2fs/dir.c +++ b/fs/f2fs/dir.c @@ -855,7 +855,7 @@ static int f2fs_readdir(struct file *file, struct dir_context *ctx) if (f2fs_encrypted_inode(inode)) { err = fscrypt_get_encryption_info(inode); - if (err) + if (err && err != -ENOKEY) return err; err = fscrypt_fname_alloc_buffer(inode, F2FS_NAME_LEN, &fstr); diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index f326764..533c2dc 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -441,6 +441,7 @@ static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma) static int f2fs_file_open(struct inode *inode, struct file *filp) { int ret = generic_file_open(inode, filp); + struct inode *dir = filp->f_path.dentry->d_parent->d_inode; if (!ret && f2fs_encrypted_inode(inode)) { ret = fscrypt_get_encryption_info(inode); @@ -449,6 +450,9 @@ static int f2fs_file_open(struct inode *inode, struct file *filp) if (!f2fs_encrypted_inode(inode)) return -ENOKEY; } + if (f2fs_encrypted_inode(dir) && + !fscrypt_has_permitted_context(dir, inode)) + return -EPERM; return ret; } diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c index 3bddd9f..7b07a47 100644 --- a/fs/f2fs/namei.c +++ b/fs/f2fs/namei.c @@ -262,6 +262,21 @@ static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry, int err = 0; unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir)); + if (f2fs_encrypted_inode(dir)) { + int res = fscrypt_get_encryption_info(dir); + + /* + * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is + * created while the directory was encrypted and we + * don't have access to the key. + */ + if (fscrypt_has_encryption_key(dir)) + fscrypt_set_encrypted_dentry(dentry); + fscrypt_set_d_op(dentry); + if (res && res != -ENOKEY) + return ERR_PTR(res); + } + if (dentry->d_name.len > F2FS_NAME_LEN) return ERR_PTR(-ENAMETOOLONG); @@ -288,6 +303,14 @@ static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry, if (err) goto err_out; } + if (!IS_ERR(inode) && f2fs_encrypted_inode(dir) && + (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) && + !fscrypt_has_permitted_context(dir, inode)) { + bool nokey = f2fs_encrypted_inode(inode) && + !fscrypt_has_encryption_key(inode); + iput(inode); + return nokey ? ERR_PTR(-ENOKEY) : ERR_PTR(-EPERM); + } return d_splice_alias(inode, dentry); err_out: -- 2.6.3