misc: dice: Add driver to forward secrets to userspace
Open Profile for DICE is a protocol for deriving unique secrets at boot,
used by some Android devices. The firmware/bootloader hands over secrets
in a reserved memory region, this driver takes ownership of the memory
region and exposes it to userspace via a character device that
lets userspace mmap the memory region into its process.
The character device can only be opened once at any given time.
Userspace can issue an ioctl requesting that the memory be wiped after
the current FD is released. In that case, the driver will clear
the buffer and refuse to open any new FDs.
Signed-off-by: David Brazdil <dbrazdil@google.com>
5 files changed
