[PATCH v2 0/5] Use EFI variables for random seed

Jason A. Donenfeld
2022-11-18T13:33:54Z

EFI has a rather unique benefit that it has access to some limited
non-volatile storage, where the kernel can store a random seed. This
series wires that up, with EFISTUB reading the seed and passing it to
the kernel, and with the kernel writing a new seed when the RNG is
initialized.

Patches 1 and 2 are to go through Ard's EFI tree, while patches 3, 4,
and 5 are to go through my RNG tree.

Jason A. Donenfeld (5):
efi: vars: prohibit reading random seed variables
efi: stub: use random seed from EFI variable
random: add back async readiness notifier
vsprintf: initialize siphash key using notifier
efi: random: refresh non-volatile random seed when RNG is initialized

drivers/char/random.c | 20 +++++++++
drivers/firmware/efi/efi.c | 19 +++++++++
drivers/firmware/efi/libstub/random.c | 59 +++++++++++++++++++++------
fs/efivarfs/inode.c | 4 ++
fs/efivarfs/super.c | 3 ++
include/linux/efi.h | 1 +
include/linux/random.h | 1 +
lib/vsprintf.c | 14 +++----
8 files changed, 100 insertions(+), 21 deletions(-)

--
2.38.1