f2fs crypto: sync ext4_lookup and ext4_file_open

This patch tries to catch up with lookup and open policies in ext4.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

3 files changed, 28 insertions, 1 deletions

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index f82e28b121a8..479467e442ea 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 04ab1e4fc1df..b41c3579ea9e 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 (!fscrypt_has_encryption_key(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 3bddd9f657e5..7b07a4799952 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: