CVE-2021-47055

In the Linux kernel, the following vulnerability has been resolved: mtd:
require write permissions for locking and badblock ioctls MEMLOCK,
MEMUNLOCK and OTPLOCK modify protection bits. Thus require write
permission. Depending on the hardware MEMLOCK might even be write-once,
e.g. for SPI-NOR flashes with their WP# tied to GND. OTPLOCK is always
write-once. MEMSETBADBLOCK modifies the bad block table.