grub2/0174-nx-set-the-nx-compatible-flag-in-EFI-grub-images.patch
Jason Montleon 2746b6c099 Update to grub2.12
Signed-off-by: Jason Montleon <jmontleo@redhat.com>
2024-08-01 20:44:38 -04:00

35 lines
1.4 KiB
Diff

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Tue, 22 Mar 2022 10:57:20 -0400
Subject: [PATCH] nx: set the nx compatible flag in EFI grub images
For NX, we need the grub binary to announce that it is compatible with
the NX feature. This implies that when loading the executable grub
image, several attributes are true:
- the binary doesn't need an executable stack
- the binary doesn't need sections to be both executable and writable
- the binary knows how to use the EFI Memory Attributes protocol on code
it is loading.
This patch adds a definition for the PE DLL Characteristics flag
GRUB_PE32_NX_COMPAT, and changes grub-mkimage to set that flag.
Signed-off-by: Peter Jones <pjones@redhat.com>
---
util/mkimage.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/util/mkimage.c b/util/mkimage.c
index e2bb4d4cd05..425d920ff92 100644
--- a/util/mkimage.c
+++ b/util/mkimage.c
@@ -1438,6 +1438,7 @@ grub_install_generate_image (const char *dir, const char *prefix,
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdangling-pointer"
#endif
+ PE_OHDR (o32, o64, dll_characteristics) = grub_host_to_target16 (GRUB_PE32_NX_COMPAT);
PE_OHDR (o32, o64, header_size) = grub_host_to_target32 (header_size);
PE_OHDR (o32, o64, entry_addr) = grub_host_to_target32 (layout.start_address);
PE_OHDR (o32, o64, image_base) = 0;