File 0008-efi-Lockdown-the-GRUB-when-the-UEFI-Secure... of Package grub2.20932

Overview Repositories Revisions Requests Users Attributes Meta

File 0008-efi-Lockdown-the-GRUB-when-the-UEFI-Secure-Boot-is-e.patch of Package grub2.20932

From 2044e27073700bc4315b5c2ad477f2d0b46d5abd Mon Sep 17 00:00:00 2001
From: Javier Martinez Canillas <javierm@redhat.com>
Date: Mon, 28 Sep 2020 20:08:29 +0200
Subject: [PATCH 08/41] efi: Lockdown the GRUB when the UEFI Secure Boot is
 enabled

If the UEFI Secure Boot is enabled then the GRUB must be locked down
to prevent executing code that can potentially be used to subvert its
verification mechanisms.

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/kern/efi/init.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/grub-core/kern/efi/init.c b/grub-core/kern/efi/init.c
index e35341ca6..06252bd39 100644
--- a/grub-core/kern/efi/init.c
+++ b/grub-core/kern/efi/init.c
@@ -20,6 +20,8 @@
 #include <grub/efi/efi.h>
 #include <grub/efi/console.h>
 #include <grub/efi/disk.h>
+#include <grub/efi/sb.h>
+#include <grub/lockdown.h>
 #include <grub/term.h>
 #include <grub/misc.h>
 #include <grub/env.h>
@@ -40,6 +42,12 @@ grub_efi_init (void)
   /* Initialize the memory management system.  */
   grub_efi_mm_init ();
 
+  /*
+   * Lockdown the GRUB if the UEFI Secure Boot is enabled.
+   */
+  if (grub_efi_get_secureboot () == GRUB_EFI_SECUREBOOT_MODE_ENABLED)
+    grub_lockdown ();
+
   efi_call_4 (grub_efi_system_table->boot_services->set_watchdog_timer,
 	      0, 0, 0, NULL);
 
-- 
2.26.2

Places

File 0008-efi-Lockdown-the-GRUB-when-the-UEFI-Secure-Boot-is-e.patch of Package grub2.20932

Places