From: B Horn <b@horn.uk>
Date: Fri, 1 Nov 2024 23:46:55 +0000 (+0000)
Subject: normal: Remove variables hooks on module unload
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9c16197734ada8d0838407eebe081117799bfe67;p=thirdparty%2Fgrub.git

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>
---

diff --git a/grub-core/normal/main.c b/grub-core/normal/main.c
index 838f57fa5..04d058f55 100644
--- a/grub-core/normal/main.c
+++ b/grub-core/normal/main.c
@@ -586,7 +586,9 @@ 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);
 }