[PATCH 4.19 032/191] fs, fscrypt: clear DCACHE_ENCRYPTED_NAME when unaliasing directory

From: Greg Kroah-Hartman
Date: Tue Nov 03 2020 - 16:02:24 EST


From: Eric Biggers <ebiggers@xxxxxxxxxx>

commit 0bf3d5c1604ecbbd4e49e9f5b3c79152b87adb0d upstream.

Make __d_move() clear DCACHE_ENCRYPTED_NAME on the source dentry. This
is needed for when d_splice_alias() moves a directory's encrypted alias
to its decrypted alias as a result of the encryption key being added.

Otherwise, the decrypted alias will incorrectly be invalidated on the
next lookup, causing problems such as unmounting a mount the user just
mount()ed there.

Note that we don't have to support arbitrary moves of this flag because
fscrypt doesn't allow dentries with DCACHE_ENCRYPTED_NAME to be the
source or target of a rename().

Fixes: 28b4c263961c ("ext4 crypto: revalidate dentry after adding or removing the key")
Reported-by: Sarthak Kukreti <sarthakkukreti@xxxxxxxxxxxx>
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/dcache.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)

--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -2713,6 +2713,20 @@ static void copy_name(struct dentry *den
}

/*
+ * When d_splice_alias() moves a directory's encrypted alias to its decrypted
+ * alias as a result of the encryption key being added, DCACHE_ENCRYPTED_NAME
+ * must be cleared. Note that we don't have to support arbitrary moves of this
+ * flag because fscrypt doesn't allow encrypted aliases to be the source or
+ * target of a rename().
+ */
+static inline void fscrypt_handle_d_move(struct dentry *dentry)
+{
+#if IS_ENABLED(CONFIG_FS_ENCRYPTION)
+ dentry->d_flags &= ~DCACHE_ENCRYPTED_NAME;
+#endif
+}
+
+/*
* __d_move - move a dentry
* @dentry: entry to move
* @target: new dentry
@@ -2787,6 +2801,7 @@ static void __d_move(struct dentry *dent
list_move(&dentry->d_child, &dentry->d_parent->d_subdirs);
__d_rehash(dentry);
fsnotify_update_flags(dentry);
+ fscrypt_handle_d_move(dentry);

write_seqcount_end(&target->d_seq);
write_seqcount_end(&dentry->d_seq);