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riscv: efi: Set NX compat flag in PE/COFF header

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[ Upstream commit d41373a4b9 ]

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@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Emil Renner Berthing <emil.renner.berthing@canonical.com>
Fixes: cb7d2dd561 ("RISC-V: Add PE/COFF header for EFI stub")
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20240929140233.211800-1-heinrich.schuchardt@canonical.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Heinrich Schuchardt 2024-09-29 16:02:33 +02:00 committed by Greg Kroah-Hartman
parent 58e78589ad
commit 909e71f28e
1 changed files with 1 additions and 1 deletions
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2
arch/riscv/kernel/efi-header.S
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@ -64,7 +64,7 @@ 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