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* [PATCH 1/1] riscv: efi: Set NX compat flag in PE/COFF header
@ 2024-09-29 14:02 Heinrich Schuchardt
  2024-10-01 10:56 ` Emil Renner Berthing
                   ` (3 more replies)
  0 siblings, 4 replies; 9+ messages in thread
From: Heinrich Schuchardt @ 2024-09-29 14:02 UTC (permalink / raw)
  To: Paul Walmsley, Palmer Dabbelt, Albert Ou
  Cc: Ard Biesheuvel, Emil Renner Berthing, linux-riscv, linux-kernel,
	Heinrich Schuchardt, stable

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>
---
 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 515b2dfbca75..c5f17c2710b5 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
-- 
2.45.2


^ permalink raw reply	[flat|nested] 9+ messages in thread

end of thread, other threads:[~2024-10-17 16:30 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2024-09-29 14:02 [PATCH 1/1] riscv: efi: Set NX compat flag in PE/COFF header Heinrich Schuchardt
2024-10-01 10:56 ` Emil Renner Berthing
2024-10-01 13:51 ` Alexandre Ghiti
2024-10-01 15:24   ` Heinrich Schuchardt
2024-10-09  7:34     ` Alexandre Ghiti
2024-10-09  7:47       ` Heinrich Schuchardt
2024-10-09  7:52         ` Alexandre Ghiti
2024-10-09  7:38 ` Ard Biesheuvel
2024-10-17 16:30 ` patchwork-bot+linux-riscv

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