buildroot/boot/grub2/0034-normal-Remove-variables-hooks-on-module-unload.patch

From 6290cc499f0fcaa82b3764cf1d9beb2ff27d82a1 Mon Sep 17 00:00:00 2001
From: B Horn <b@horn.uk>
Date: Fri, 1 Nov 2024 23:46:55 +0000
Subject: [PATCH] normal: Remove variables hooks on module unload

The normal module does not entirely cleanup after itself in
its GRUB_MOD_FINI() leaving a few variables hooks in place.
It is not possible to unload normal module now but fix the
issues for completeness.

On the occasion replace 0s with NULLs for "pager" variable
hooks unregister.

Fixes: CVE-2025-0622

Reported-by: B Horn <b@horn.uk>
Signed-off-by: B Horn <b@horn.uk>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Upstream: 9c16197734ada8d0838407eebe081117799bfe67
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
---
 grub-core/normal/main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/grub-core/normal/main.c b/grub-core/normal/main.c
index 3b48cd333..5d848c864 100644
--- a/grub-core/normal/main.c
+++ b/grub-core/normal/main.c
@@ -582,7 +582,9 @@ GRUB_MOD_FINI(normal)
   grub_xputs = grub_xputs_saved;
 
   grub_set_history (0);
-  grub_register_variable_hook ("pager", 0, 0);
+  grub_register_variable_hook ("pager", NULL, NULL);
+  grub_register_variable_hook ("color_normal", NULL, NULL);
+  grub_register_variable_hook ("color_highlight", NULL, NULL);
   grub_fs_autoload_hook = 0;
   grub_unregister_command (cmd_clear);
 }
-- 
2.50.1