grub2/grub2-secureboot-no-insmod-on-sb.patch

From 29c89e27805f7a6a22bce11ed9bb430e19c972a9 Mon Sep 17 00:00:00 2001
From: Colin Watson <cjwatson@ubuntu.com>
Date: Tue, 23 Oct 2012 10:40:49 -0400
Subject: [PATCH 449/482] Don't allow insmod when secure boot is enabled.

References: fate#314485
Patch-Mainline: no

v2:
Use grub_efi_get_secureboot to get secure boot status

Signed-off-by: Michael Chang <mchang@suse.com>
---
 grub-core/kern/dl.c      | 17 +++++++++++++++++
 grub-core/kern/efi/efi.c | 28 ++++++++++++++++++++++++++++
 include/grub/efi/efi.h   |  1 +
 3 files changed, 46 insertions(+)

Index: grub-2.04/grub-core/kern/dl.c
===================================================================
--- grub-2.04.orig/grub-core/kern/dl.c
+++ grub-2.04/grub-core/kern/dl.c
@@ -38,6 +38,10 @@
 #define GRUB_MODULES_MACHINE_READONLY
 #endif
 
+#ifdef GRUB_MACHINE_EFI
+#include <grub/efi/sb.h>
+#endif
+
 
 
 #pragma GCC diagnostic ignored "-Wcast-align"
@@ -688,6 +692,19 @@ grub_dl_load_file (const char *filename)
 
   grub_boot_time ("Loading module %s", filename);
 
+#ifdef GRUB_MACHINE_EFI
+  if (grub_efi_get_secureboot () == GRUB_EFI_SECUREBOOT_MODE_ENABLED)
+    {
+#if 0
+      /* This is an error, but grub2-mkconfig still generates a pile of
+       * insmod commands, so emitting it would be mostly just obnoxious. */
+      grub_error (GRUB_ERR_ACCESS_DENIED,
+		  "Secure Boot forbids loading module from %s", filename);
+#endif
+      return 0;
+    }
+#endif
+
   file = grub_file_open (filename, GRUB_FILE_TYPE_GRUB_MODULE);
   if (! file)
     return 0;