efi/x86: Only copy the compressed kernel image in efi_relocate_kernel()

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The image_size argument to efi_relocate_kernel() is currently specified
as init_size, but this is unnecessarily large. The compressed kernel is
much smaller, in fact, its image only extends up to the start of _bss,
since at this point, the .bss section is still uninitialized.

Depending on compression level, this can reduce the amount of data
copied by 4-5x.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Link: https://lore.kernel.org/r/20201011142012.96493-1-nivedita@alum.mit.edu
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

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Arvind Sankar 2020-10-11 10:20:12 -04:00 • committed by Ard Biesheuvel

parent bc13809f1c

commit 688eb28211

1 changed files with 4 additions and 1 deletions

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drivers/firmware/efi/libstub/x86-stub.c

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