ext4: prevent creating duplicate encrypted filenames

commit 75d18cd1868c2aee43553723872c35d7908f240f upstream.

As described in "fscrypt: add fscrypt_is_nokey_name()", it's possible to
create a duplicate filename in an encrypted directory by creating a file
concurrently with adding the directory's encryption key.

Fix this bug on ext4 by rejecting no-key dentries in ext4_add_entry().

Note that the duplicate check in ext4_find_dest_de() sometimes prevented
this bug.  However in many cases it didn't, since ext4_find_dest_de()
doesn't examine every dentry.

Fixes: 4461471107b7 ("ext4 crypto: enable filename encryption")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20201118075609.120337-3-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 3350926..793fc7d 100644 (file)
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2195,6 +2195,9 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
        if (!dentry->d_name.len)
                return -EINVAL;
 
+       if (fscrypt_is_nokey_name(dentry))
+               return -ENOKEY;
+
 #ifdef CONFIG_UNICODE
        if (sb_has_strict_encoding(sb) && IS_CASEFOLDED(dir) &&
            sb->s_encoding && utf8_validate(sb->s_encoding, &dentry->d_name))