efi/libstub/arm64: Simplify randomized loading of kernel image

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The KASLR code path in the arm64 version of the EFI stub incorporates
some overly complicated logic to randomly allocate a region of the right
alignment: there is no need to randomize the placement of the kernel
modulo 2 MiB separately from the placement of the 2 MiB aligned allocation
itself - we can simply follow the same logic used by the non-randomized
placement, which is to allocate at the correct alignment, and only take
TEXT_OFFSET into account if it is not a round multiple of the alignment.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

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Ard Biesheuvel 2020-04-13 15:36:37 +02:00

parent 82046702e2

commit 5d12da9dd6

1 changed files with 5 additions and 27 deletions

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32

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

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