From 0fcac402e2685a9de7b9ec7b3fc9fd3dbd31a478 Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Tue, 27 Oct 2020 08:32:06 +0100 Subject: [PATCH] arm64: efi: increase EFI PE/COFF header padding to 64 KB Commit 90118623acdd ("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: 90118623acdd ("efi/libstub/arm64: align PE/COFF sections to segment alignment") Signed-off-by: Ard Biesheuvel Link: https://lore.kernel.org/r/20201027073209.2897-2-ardb@kernel.org Signed-off-by: Will Deacon --- arch/arm64/kernel/efi-header.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/kernel/efi-header.S b/arch/arm64/kernel/efi-header.S index df67c0f2a077e..a71844fb923ee 100644 --- a/arch/arm64/kernel/efi-header.S +++ b/arch/arm64/kernel/efi-header.S @@ -147,6 +147,6 @@ efi_debug_entry: * correctly at this alignment, we must ensure that .text is * placed at a 4k boundary in the Image to begin with. */ - .align 12 + .balign SEGMENT_ALIGN efi_header_end: .endm -- 2.39.5