6.6-stable review patch. If anyone has any objections, please let me know.
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From: Heinrich Schuchardt heinrich.schuchardt@canonical.com
[ 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@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: cb7d2dd5612a ("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@canoni... Signed-off-by: Palmer Dabbelt palmer@rivosinc.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/riscv/kernel/efi-header.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/riscv/kernel/efi-header.S b/arch/riscv/kernel/efi-header.S index 515b2dfbca75b..c5f17c2710b58 100644 --- a/arch/riscv/kernel/efi-header.S +++ b/arch/riscv/kernel/efi-header.S @@ -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