loader/xnu: Don't allow loading extension and packages when locked down

The shim_lock verifier validates the XNU kernels but no its extensions
and packages. Prevent these to be loaded when the GRUB is locked down.

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

diff --git a/grub-core/loader/xnu.c b/grub-core/loader/xnu.c
index 9ae4ceb35357dd263c6dc7073d3ce0bb614f29c7..44fd5a979a5760a34ac30c02c78a9db8c77706ab 100644 (file)
--- a/grub-core/loader/xnu.c
+++ b/grub-core/loader/xnu.c
@@ -1485,20 +1485,23 @@ GRUB_MOD_INIT(xnu)
                                      N_("Load XNU image."));
   cmd_kernel64 = grub_register_command ("xnu_kernel64", grub_cmd_xnu_kernel64,
                                        0, N_("Load 64-bit XNU image."));
-  cmd_mkext = grub_register_command ("xnu_mkext", grub_cmd_xnu_mkext, 0,
-                                    N_("Load XNU extension package."));
-  cmd_kext = grub_register_command ("xnu_kext", grub_cmd_xnu_kext, 0,
-                                   N_("Load XNU extension."));
-  cmd_kextdir = grub_register_command ("xnu_kextdir", grub_cmd_xnu_kextdir,
-                                      /* TRANSLATORS: OSBundleRequired is a
-                                         variable name in xnu extensions
-                                         manifests. It behaves mostly like
-                                         GNU/Linux runlevels.
-                                      */
-                                      N_("DIRECTORY [OSBundleRequired]"),
-                                      /* TRANSLATORS: There are many extensions
-                                         in extension directory.  */
-                                      N_("Load XNU extension directory."));
+  cmd_mkext = grub_register_command_lockdown ("xnu_mkext", grub_cmd_xnu_mkext, 0,
+                                             N_("Load XNU extension package."));
+  cmd_kext = grub_register_command_lockdown ("xnu_kext", grub_cmd_xnu_kext, 0,
+                                            N_("Load XNU extension."));
+  cmd_kextdir = grub_register_command_lockdown ("xnu_kextdir", grub_cmd_xnu_kextdir,
+                                               /*
+                                                * TRANSLATORS: OSBundleRequired is
+                                                * a variable name in xnu extensions
+                                                * manifests. It behaves mostly like
+                                                * GNU/Linux runlevels.
+                                                */
+                                               N_("DIRECTORY [OSBundleRequired]"),
+                                               /*
+                                                * TRANSLATORS: There are many extensions
+                                                * in extension directory.
+                                                */
+                                               N_("Load XNU extension directory."));
   cmd_ramdisk = grub_register_command ("xnu_ramdisk", grub_cmd_xnu_ramdisk, 0,
    /* TRANSLATORS: ramdisk here isn't identifier. It can be translated.  */
                                       N_("Load XNU ramdisk. "