From: Richard Weinberger <richard@xxxxxx>
commit 9a200d075e5d05be1fcad4547a0f8aee4e2f9a04 upstream.
...otherwise an user can enable encryption for certain files even
when the filesystem is unable to support it.
Such a case would be a filesystem created by mkfs.ext4's default
settings, 1KiB block size. Ext4 supports encyption only when block size
is equal to PAGE_SIZE.
But this constraint is only checked when the encryption feature flag
is set.
Signed-off-by: Richard Weinberger <richard@xxxxxx>
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
---
fs/ext4/ioctl.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 4196aa567784..dbe1ff511794 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -630,6 +630,9 @@ resizefs_out:
struct ext4_encryption_policy policy;
int err = 0;
+ if (!ext4_sb_has_crypto(sb))
+ return -EOPNOTSUPP;
+
if (copy_from_user(&policy,
(struct ext4_encryption_policy __user *)arg,
sizeof(policy))) {
--
2.16.2.395.g2e18187dfd-goog
