This is a note to let you know that I've just added the patch titled
arm64: efi: increase EFI PE/COFF header padding to 64 KB
to the 5.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm64-efi-increase-efi-pe-coff-header-padding-to-64-.patch
and it can be found in the queue-5.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 9f929198112ea6b0e34f08d6f4419b55cd286b2b
Author: Ard Biesheuvel <ardb@xxxxxxxxxx>
Date: Tue Oct 27 08:32:06 2020 +0100
arm64: efi: increase EFI PE/COFF header padding to 64 KB
[ Upstream commit a2d50c1c77aa879af24f9f67b33186737b3d4885 ]
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@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20201027073209.2897-2-ardb@xxxxxxxxxx
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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
