efi/arm64: libstub: Deal gracefully with EFI_RNG_PROTOCOL failure

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Currently, on arm64, we abort on any failure from efi_get_random_bytes()
other than EFI_NOT_FOUND when it comes to setting the physical seed for
KASLR, but ignore such failures when obtaining the seed for virtual
KASLR or for early seeding of the kernel's entropy pool via the config
table. This is inconsistent, and may lead to unexpected boot failures.

So let's permit any failure for the physical seed, and simply report
the error code if it does not equal EFI_NOT_FOUND.

Cc: <stable@vger.kernel.org> # v5.8+
Reported-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

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This commit is contained in:

Ard Biesheuvel 2020-09-26 10:52:42 +02:00

parent 336af6a468

commit d32de9130f

2 changed files with 6 additions and 6 deletions

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8

drivers/firmware/efi/libstub/arm64-stub.c

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4

drivers/firmware/efi/libstub/fdt.c

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