arm64: efi: increase EFI PE/COFF header padding to 64 KB
authorArd Biesheuvel <ardb@kernel.org>
Tue, 27 Oct 2020 07:32:06 +0000 (08:32 +0100)
committerWill Deacon <will@kernel.org>
Wed, 28 Oct 2020 14:02:03 +0000 (14:02 +0000)
commita2d50c1c77aa879af24f9f67b33186737b3d4885
tree84d7b18775ce1c3bb67e2a1e40577011a49c712f
parent5f692a81b4e923d0e856d35a708e53b97e8f8755
arm64: efi: increase EFI PE/COFF header padding to 64 KB

Commit 76085aff29f5 ("efi/libstub/arm64: align PE/COFF sections to segment
alignment") increased the PE/COFF section alignment to match the minimum
segment alignment of the kernel image, which ensures that the kernel does
not need to be moved around in memory by the EFI stub if it was built as
relocatable.

However, the first PE/COFF section starts at _stext, which is only 4 KB
aligned, and so the section layout is inconsistent. Existing EFI loaders
seem to care little about this, but it is better to clean this up.

So let's pad the header to 64 KB to match the PE/COFF section alignment.

Fixes: 76085aff29f5 ("efi/libstub/arm64: align PE/COFF sections to segment alignment")
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20201027073209.2897-2-ardb@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
arch/arm64/kernel/efi-header.S