Ard Biesheuvel 2b5fe07a78
arm64: efi: invoke EFI_RNG_PROTOCOL to supply KASLR randomness ...
Since arm64 does not use a decompressor that supplies an execution
environment where it is feasible to some extent to provide a source of
randomness, the arm64 KASLR kernel depends on the bootloader to supply
some random bits in the /chosen/kaslr-seed DT property upon kernel entry.
On UEFI systems, we can use the EFI_RNG_PROTOCOL, if supplied, to obtain
some random bits. At the same time, use it to randomize the offset of the
kernel Image in physical memory.
Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk >
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org >
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com >
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