normal/main: Unregister commands on module unload

When the normal module is loaded, the normal and normal_exit commands
are registered but aren't unregistered when the module is unloaded. We
need to add calls to grub_unregister_command() when unloading the module
for these commands.

Fixes: CVE-2025-61663
Fixes: CVE-2025-61664
Reported-by: Alec Brown <alec.r.brown@oracle.com>
Signed-off-by: Alec Brown <alec.r.brown@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

diff --git a/grub-core/normal/main.c b/grub-core/normal/main.c
index 8c2acf938b3675030dc9f7dc3a2b4314945a28df..de9a3f9612aaa10e0e8d528f118d1944d1ac48e2 100644 (file)
--- a/grub-core/normal/main.c
+++ b/grub-core/normal/main.c
@@ -510,7 +510,7 @@ grub_mini_cmd_clear (struct grub_command *cmd __attribute__ ((unused)),
   return 0;
 }
 
-static grub_command_t cmd_clear;
+static grub_command_t cmd_clear, cmd_normal, cmd_normal_exit;
 
 static void (*grub_xputs_saved) (const char *str);
 static const char *features[] = {
@@ -554,10 +554,10 @@ GRUB_MOD_INIT(normal)
   grub_env_export ("pager");
 
   /* Register a command "normal" for the rescue mode.  */
-  grub_register_command ("normal", grub_cmd_normal,
-                        0, N_("Enter normal mode."));
-  grub_register_command ("normal_exit", grub_cmd_normal_exit,
-                        0, N_("Exit from normal mode."));
+  cmd_normal = grub_register_command ("normal", grub_cmd_normal,
+                                     0, N_("Enter normal mode."));
+  cmd_normal_exit = grub_register_command ("normal_exit", grub_cmd_normal_exit,
+                                          0, N_("Exit from normal mode."));
 
   /* Reload terminal colors when these variables are written to.  */
   grub_register_variable_hook ("color_normal", NULL, grub_env_write_color_normal);
@@ -599,4 +599,6 @@ GRUB_MOD_FINI(normal)
   grub_register_variable_hook ("color_highlight", NULL, NULL);
   grub_fs_autoload_hook = 0;
   grub_unregister_command (cmd_clear);
+  grub_unregister_command (cmd_normal);
+  grub_unregister_command (cmd_normal_exit);
 }