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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: Mon, 28 Sep 2020 20:08:29 +0200
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Subject: [PATCH] efi: Lockdown the GRUB when the UEFI Secure Boot is enabled
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If the UEFI Secure Boot is enabled then the GRUB must be locked down
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to prevent executing code that can potentially be used to subvert its
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verification mechanisms.
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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/kern/efi/init.c | 19 +++++++++++++++++++
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1 file changed, 19 insertions(+)
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diff --git a/grub-core/kern/efi/init.c b/grub-core/kern/efi/init.c
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index 79243b364a1..97bf36906a4 100644
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--- a/grub-core/kern/efi/init.c
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+++ b/grub-core/kern/efi/init.c
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@@ -20,6 +20,8 @@
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#include <grub/efi/efi.h>
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#include <grub/efi/console.h>
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#include <grub/efi/disk.h>
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+#include <grub/efi/sb.h>
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+#include <grub/lockdown.h>
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#include <grub/term.h>
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#include <grub/misc.h>
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#include <grub/env.h>
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@@ -93,6 +95,23 @@ grub_efi_init (void)
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/* Initialize the memory management system. */
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grub_efi_mm_init ();
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+ /*
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+ * Lockdown the GRUB and register the shim_lock verifier
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+ * if the UEFI Secure Boot is enabled.
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+ */
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+ if (grub_efi_secure_boot ())
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+ {
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+ grub_lockdown ();
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+
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+ /*
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+ * TODO: Move GRUB to using the shim_lock verifier and
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+ * enable the lockdown verifier.
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+ */
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+#if 0
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+ grub_shim_lock_verifier_setup ();
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+#endif
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+ }
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+
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efi_call_4 (grub_efi_system_table->boot_services->set_watchdog_timer,
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0, 0, 0, NULL);
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