This is a note to let you know that I've just added the patch titled
riscv: efi: Set NX compat flag in PE/COFF header
to the 5.10-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:
riscv-efi-set-nx-compat-flag-in-pe-coff-header.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 1f6eb0c07ee692b9a4786670bb3e2b4c6d9682cd
Author: Heinrich Schuchardt <heinrich.schuchardt@xxxxxxxxxxxxx>
Date: Sun Sep 29 16:02:33 2024 +0200
riscv: efi: Set NX compat flag in PE/COFF header
[ Upstream commit d41373a4b910961df5a5e3527d7bde6ad45ca438 ]
The IMAGE_DLLCHARACTERISTICS_NX_COMPAT informs the firmware that the
EFI binary does not rely on pages that are both executable and
writable.
The flag is used by some distro versions of GRUB to decide if the EFI
binary may be executed.
As the Linux kernel neither has RWX sections nor needs RWX pages for
relocation we should set the flag.
Cc: Ard Biesheuvel <ardb@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@xxxxxxxxxxxxx>
Reviewed-by: Emil Renner Berthing <emil.renner.berthing@xxxxxxxxxxxxx>
Fixes: cb7d2dd5612a ("RISC-V: Add PE/COFF header for EFI stub")
Acked-by: Ard Biesheuvel <ardb@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240929140233.211800-1-heinrich.schuchardt@xxxxxxxxxxxxx
Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/riscv/kernel/efi-header.S b/arch/riscv/kernel/efi-header.S
index 8e733aa48ba6c..c306f3a6a800e 100644
--- a/arch/riscv/kernel/efi-header.S
+++ b/arch/riscv/kernel/efi-header.S
@@ -59,7 +59,7 @@ extra_header_fields:
.long efi_header_end - _start // SizeOfHeaders
.long 0 // CheckSum
.short IMAGE_SUBSYSTEM_EFI_APPLICATION // Subsystem
- .short 0 // DllCharacteristics
+ .short IMAGE_DLL_CHARACTERISTICS_NX_COMPAT // DllCharacteristics
.quad 0 // SizeOfStackReserve
.quad 0 // SizeOfStackCommit
.quad 0 // SizeOfHeapReserve
