efi: random: refresh non-volatile random seed when RNG is initialized

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EFI has a rather unique benefit that it has access to some limited
non-volatile storage, where the kernel can store a random seed. Register
a notification for when the RNG is initialized, and at that point, store
a new random seed.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

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Jason A. Donenfeld 2022-11-16 17:16:42 +01:00

parent 898f1e5c37

commit e7b813b32a

1 changed files with 19 additions and 0 deletions

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drivers/firmware/efi/efi.c

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