File 0013-gettext-Remove-variables-hooks-on-module-unload.patch of Package grub2.37159

From 98c63c9c7c40d143049542efbdf535ddb374524b Mon Sep 17 00:00:00 2001
From: B Horn <b@horn.uk>
Date: Fri, 1 Nov 2024 23:52:06 +0000
Subject: [PATCH 13/20] gettext: Remove variables hooks on module unload

The gettext 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 gettext module because normal
module depends on it. Though fix the issues for completeness.

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>
---
 grub-core/gettext/gettext.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/grub-core/gettext/gettext.c b/grub-core/gettext/gettext.c
index 28f9d4b134..970cf7df4c 100644
--- a/grub-core/gettext/gettext.c
+++ b/grub-core/gettext/gettext.c
@@ -539,6 +539,10 @@ GRUB_MOD_INIT (gettext)
 
 GRUB_MOD_FINI (gettext)
 {
+  grub_register_variable_hook ("locale_dir", NULL, NULL);
+  grub_register_variable_hook ("secondary_locale_dir", NULL, NULL);
+  grub_register_variable_hook ("lang", NULL, NULL);
+
   grub_gettext_delete_list (&main_context);
   grub_gettext_delete_list (&secondary_context);
 
-- 
2.48.1