ext4: require encryption feature for EXT4_IOC_SET_ENCRYPTION_POLICY
authorRichard Weinberger <richard@nod.at>
Fri, 30 Sep 2016 05:49:55 +0000 (01:49 -0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 8 May 2017 05:46:02 +0000 (07:46 +0200)
commite2968fb8e7980dccc199dac2593ad476db20969f
treea36800a21c48ec704a9c7c53b04c142557ad7292
parentfee1f42b961e6cc3ec570e1fdba224d7d49b517d
ext4: require encryption feature for EXT4_IOC_SET_ENCRYPTION_POLICY

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@nod.at>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
fs/ext4/ioctl.c