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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Javier Martinez Canillas <javierm@redhat.com>
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Date: Wed, 24 Feb 2021 14:44:38 +0100
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Subject: [PATCH] loader/xnu: Don't allow loading extension and packages when
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locked down
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The shim_lock verifier validates the XNU kernels but no its extensions
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and packages. Prevent these to be loaded when the GRUB is locked down.
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Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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grub-core/loader/xnu.c | 31 +++++++++++++++++--------------
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1 file changed, 17 insertions(+), 14 deletions(-)
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diff --git a/grub-core/loader/xnu.c b/grub-core/loader/xnu.c
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index 2bf02489bad..0c4b33250fb 100644
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--- a/grub-core/loader/xnu.c
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+++ b/grub-core/loader/xnu.c
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@@ -1480,20 +1480,23 @@ GRUB_MOD_INIT(xnu)
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N_("Load XNU image."));
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cmd_kernel64 = grub_register_command ("xnu_kernel64", grub_cmd_xnu_kernel64,
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0, N_("Load 64-bit XNU image."));
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- cmd_mkext = grub_register_command ("xnu_mkext", grub_cmd_xnu_mkext, 0,
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- N_("Load XNU extension package."));
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- cmd_kext = grub_register_command ("xnu_kext", grub_cmd_xnu_kext, 0,
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- N_("Load XNU extension."));
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- cmd_kextdir = grub_register_command ("xnu_kextdir", grub_cmd_xnu_kextdir,
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- /* TRANSLATORS: OSBundleRequired is a
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- variable name in xnu extensions
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- manifests. It behaves mostly like
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- GNU/Linux runlevels.
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- */
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- N_("DIRECTORY [OSBundleRequired]"),
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- /* TRANSLATORS: There are many extensions
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- in extension directory. */
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- N_("Load XNU extension directory."));
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+ cmd_mkext = grub_register_command_lockdown ("xnu_mkext", grub_cmd_xnu_mkext, 0,
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+ N_("Load XNU extension package."));
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+ cmd_kext = grub_register_command_lockdown ("xnu_kext", grub_cmd_xnu_kext, 0,
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+ N_("Load XNU extension."));
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+ cmd_kextdir = grub_register_command_lockdown ("xnu_kextdir", grub_cmd_xnu_kextdir,
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+ /*
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+ * TRANSLATORS: OSBundleRequired is
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+ * a variable name in xnu extensions
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+ * manifests. It behaves mostly like
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+ * GNU/Linux runlevels.
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+ */
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+ N_("DIRECTORY [OSBundleRequired]"),
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+ /*
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+ * TRANSLATORS: There are many extensions
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+ * in extension directory.
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+ */
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+ N_("Load XNU extension directory."));
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cmd_ramdisk = grub_register_command ("xnu_ramdisk", grub_cmd_xnu_ramdisk, 0,
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/* TRANSLATORS: ramdisk here isn't identifier. It can be translated. */
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N_("Load XNU ramdisk. "
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