This is a fix for CVE-2021-20261. As kernel config, drop CONFIG_BLK_DEV_FD
to address this issue.

Link: https://lore.kernel.org/cip-dev/d111661c-cdda-3031-66e3-054a5cdcc943@siemens.com/


Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>