grub2/0213-Add-support-for-Linux-EFI-stub-loading.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Matthew Garrett <mjg@redhat.com>
Date: Mon, 1 Apr 2024 13:20:18 -0600
Subject: [PATCH] Add support for Linux EFI stub loading.

Also:

commit 71c843745f22f81e16d259e2e19c99bf3c1855c1
Author: Colin Watson <cjwatson@ubuntu.com>
Date:   Tue Oct 23 10:40:49 2012 -0400

Don't allow insmod when secure boot is enabled.

Hi,

Fedora's patch to forbid insmod in UEFI Secure Boot environments is fine
as far as it goes.  However, the insmod command is not the only way that
modules can be loaded.  In particular, the 'normal' command, which
implements the usual GRUB menu and the fully-featured command prompt,
will implicitly load commands not currently loaded into memory.  This
permits trivial Secure Boot violations by writing commands implementing
whatever you want to do and pointing $prefix at the malicious code.

I'm currently test-building this patch (replacing your current
grub-2.00-no-insmod-on-sb.patch), but this should be more correct.  It
moves the check into grub_dl_load_file.
---
 grub-core/Makefile.core.def       |  16 +-
 grub-core/kern/dl.c               |  22 +++
 grub-core/kern/efi/mm.c           |  32 ++++
 grub-core/loader/efi/linux.c      |  47 ++++++
 grub-core/loader/i386/efi/linux.c | 335 ++++++++++++++++++++++++++++++++++++++
 grub-core/loader/i386/pc/linux.c  |  10 +-
 include/grub/efi/efi.h            |   3 +
 include/grub/efi/linux.h          |  31 ++++
 8 files changed, 485 insertions(+), 11 deletions(-)
 create mode 100644 grub-core/loader/i386/efi/linux.c
 create mode 100644 include/grub/efi/linux.h

diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
index a5a3ee31800..3f6e944d6a5 100644
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@@ -1831,12 +1831,6 @@ module = {
 };
 
 
-module = {
-  name = linux16;
-  common = loader/i386/pc/linux.c;
-  enable = x86;
-};
-
 module = {
   name = ntldr;
   i386_pc = loader/i386/pc/ntldr.c;
@@ -1892,10 +1886,9 @@ module = {
 
 module = {
   name = linux;
-  x86 = loader/i386/linux.c;
   i386_xen_pvh = loader/i386/linux.c;
   xen = loader/i386/xen.c;
-  i386_pc = lib/i386/pc/vesa_modes_table.c;
+  i386_pc = loader/i386/pc/linux.c;
   i386_xen_pvh = lib/i386/pc/vesa_modes_table.c;
   mips = loader/mips/linux.c;
   powerpc_ieee1275 = loader/powerpc/ieee1275/linux.c;
@@ -1908,11 +1901,14 @@ module = {
   loongarch64 = loader/efi/linux.c;
   riscv32 = loader/efi/linux.c;
   riscv64 = loader/efi/linux.c;
-  i386_efi = loader/efi/linux.c;
-  x86_64_efi = loader/efi/linux.c;
+  i386_efi = loader/i386/efi/linux.c;
+  x86_64_efi = loader/i386/efi/linux.c;
   emu = loader/emu/linux.c;
+  fdt = lib/fdt.c;
   common = loader/linux.c;
   common = lib/cmdline.c;
+  efi = loader/efi/linux.c;
+  efi = loader/i386/linux.c;
 };
 
 module = {
diff --git a/grub-core/kern/dl.c b/grub-core/kern/dl.c
index c55f0ecf931..d48d4131ba7 100644
--- a/grub-core/kern/dl.c
+++ b/grub-core/kern/dl.c
@@ -32,12 +32,21 @@
 #include <grub/env.h>
 #include <grub/cache.h>
 #include <grub/i18n.h>
+#include <grub/efi/sb.h>
 
 /* Platforms where modules are in a readonly area of memory.  */
 #if defined(GRUB_MACHINE_QEMU)
 #define GRUB_MODULES_MACHINE_READONLY
 #endif
 
+#ifdef GRUB_MACHINE_EMU
+#include <sys/mman.h>
+#endif
+
+#ifdef GRUB_MACHINE_EFI
+#include <grub/efi/efi.h>
+#endif
+
 
 
 #pragma GCC diagnostic ignored "-Wcast-align"
@@ -861,6 +870,19 @@ grub_dl_load_file (const char *filename)
   void *core = 0;
   grub_dl_t mod = 0;
 
+#ifdef GRUB_MACHINE_EFI
+  if (grub_efi_get_secureboot ())
+    {
+#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
+
   grub_boot_time ("Loading module %s", filename);
 
   file = grub_file_open (filename, GRUB_FILE_TYPE_GRUB_MODULE);
diff --git a/grub-core/kern/efi/mm.c b/grub-core/kern/efi/mm.c
index df443f434d4..fb9dbf52528 100644
--- a/grub-core/kern/efi/mm.c
+++ b/grub-core/kern/efi/mm.c
@@ -112,6 +112,38 @@ grub_efi_drop_alloc (grub_efi_physical_address_t address,
     }
 }
 
+/* Allocate pages below a specified address */
+void *
+grub_efi_allocate_pages_max (grub_efi_physical_address_t max,
+			     grub_efi_uintn_t pages)
+{
+  grub_efi_status_t status;
+  grub_efi_boot_services_t *b;
+  grub_efi_physical_address_t address = max;
+
+  if (max > 0xffffffff)
+    return 0;
+
+  b = grub_efi_system_table->boot_services;
+  status = b->allocate_pages (GRUB_EFI_ALLOCATE_MAX_ADDRESS, GRUB_EFI_LOADER_DATA, pages, &address);
+
+  if (status != GRUB_EFI_SUCCESS)
+    return 0;
+
+  if (address == 0)
+    {
+      /* Uggh, the address 0 was allocated... This is too annoying,
+	 so reallocate another one.  */
+      address = max;
+      status = b->allocate_pages (GRUB_EFI_ALLOCATE_MAX_ADDRESS, GRUB_EFI_LOADER_DATA, pages, &address);
+      grub_efi_free_pages (0, pages);
+      if (status != GRUB_EFI_SUCCESS)
+	return 0;
+    }
+
+  return (void *) ((grub_addr_t) address);
+}
+
 /* Allocate pages. Return the pointer to the first of allocated pages.  */
 void *
 grub_efi_allocate_pages_real (grub_efi_physical_address_t address,
diff --git a/grub-core/loader/efi/linux.c b/grub-core/loader/efi/linux.c
index bfbd95aeef0..925394d1767 100644
--- a/grub-core/loader/efi/linux.c
+++ b/grub-core/loader/efi/linux.c
@@ -25,10 +25,12 @@
 #include <grub/loader.h>
 #include <grub/mm.h>
 #include <grub/types.h>
+#include <grub/cpu/linux.h>
 #include <grub/efi/efi.h>
 #include <grub/efi/fdtload.h>
 #include <grub/efi/memory.h>
 #include <grub/efi/pe32.h>
+#include <grub/efi/linux.h>
 #include <grub/efi/sb.h>
 #include <grub/i18n.h>
 #include <grub/lib/cmdline.h>
@@ -87,6 +89,51 @@ static grub_efi_load_file2_t initrd_lf2 = {
   grub_efi_initrd_load_file2
 };
 
+#define SHIM_LOCK_GUID \
+ { 0x605dab50, 0xe046, 0x4300, {0xab, 0xb6, 0x3d, 0xd8, 0x10, 0xdd, 0x8b, 0x23} }
+
+struct grub_efi_shim_lock
+{
+  grub_efi_status_t (*verify) (void *buffer, grub_uint32_t size);
+};
+typedef struct grub_efi_shim_lock grub_efi_shim_lock_t;
+
+grub_efi_boolean_t
+grub_linuxefi_secure_validate (void *data, grub_uint32_t size)
+{
+  grub_guid_t guid = SHIM_LOCK_GUID;
+  grub_efi_shim_lock_t *shim_lock;
+
+  shim_lock = grub_efi_locate_protocol(&guid, NULL);
+
+  if (!shim_lock)
+    return 1;
+
+  if (shim_lock->verify(data, size) == GRUB_EFI_SUCCESS)
+    return 1;
+
+  return 0;
+}
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wcast-align"
+
+typedef void (*handover_func) (void *, grub_efi_system_table_t *, void *);
+
+grub_err_t
+grub_efi_linux_boot (void *kernel_address, grub_off_t offset,
+		     void *kernel_params)
+{
+  handover_func hf;
+
+  hf = (handover_func)((char *)kernel_address + offset);
+  hf (grub_efi_image_handle, grub_efi_system_table, kernel_params);
+
+  return GRUB_ERR_BUG;
+}
+
+#pragma GCC diagnostic pop
+
 grub_err_t
 grub_arch_efi_linux_load_image_header (grub_file_t file,
                                       struct linux_arch_kernel_header * lh)
diff --git a/grub-core/loader/i386/efi/linux.c b/grub-core/loader/i386/efi/linux.c
new file mode 100644
index 00000000000..9bfb4ab9e3e
--- /dev/null
+++ b/grub-core/loader/i386/efi/linux.c
@@ -0,0 +1,335 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2012  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/loader.h>
+#include <grub/file.h>
+#include <grub/err.h>
+#include <grub/types.h>
+#include <grub/mm.h>
+#include <grub/cpu/linux.h>
+#include <grub/command.h>
+#include <grub/i18n.h>
+#include <grub/lib/cmdline.h>
+#include <grub/efi/efi.h>
+#include <grub/efi/linux.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+static grub_dl_t my_mod;
+static int loaded;
+static void *kernel_mem;
+static grub_uint64_t kernel_size;
+static grub_uint8_t *initrd_mem;
+static grub_uint32_t handover_offset;
+struct linux_kernel_params *params;
+static char *linux_cmdline;
+
+#define BYTES_TO_PAGES(bytes)   (((bytes) + 0xfff) >> 12)
+
+static grub_err_t
+grub_linuxefi_boot (void)
+{
+  int offset = 0;
+
+#ifdef __x86_64__
+  offset = 512;
+#endif
+  asm volatile ("cli");
+
+  return grub_efi_linux_boot ((char *)kernel_mem, handover_offset + offset,
+                              params);
+}
+
+static grub_err_t
+grub_linuxefi_unload (void)
+{
+  grub_dl_unref (my_mod);
+  loaded = 0;
+  if (initrd_mem)
+    grub_efi_free_pages ((grub_efi_physical_address_t)(grub_addr_t)initrd_mem,
+                         BYTES_TO_PAGES(params->ramdisk_size));
+  if (linux_cmdline)
+    grub_efi_free_pages ((grub_efi_physical_address_t)(grub_addr_t)
+                         linux_cmdline,
+                         BYTES_TO_PAGES(params->cmdline_size + 1));
+  if (kernel_mem)
+    grub_efi_free_pages ((grub_efi_physical_address_t)(grub_addr_t)kernel_mem,
+                         BYTES_TO_PAGES(kernel_size));
+  if (params)
+    grub_efi_free_pages ((grub_efi_physical_address_t)(grub_addr_t)params,
+                         BYTES_TO_PAGES(16384));
+  return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
+                 int argc, char *argv[])
+{
+  grub_file_t *files = 0;
+  int i, nfiles = 0;
+  grub_size_t size = 0;
+  grub_uint8_t *ptr;
+
+  if (argc == 0)
+    {
+      grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
+      goto fail;
+    }
+
+  if (!loaded)
+    {
+      grub_error (GRUB_ERR_BAD_ARGUMENT, N_("you need to load the kernel first"));
+      goto fail;
+    }
+
+  files = grub_zalloc (argc * sizeof (files[0]));
+  if (!files)
+    goto fail;
+
+  for (i = 0; i < argc; i++)
+    {
+      files[i] = grub_file_open (argv[i], GRUB_FILE_TYPE_LINUX_INITRD | GRUB_FILE_TYPE_NO_DECOMPRESS);
+      if (! files[i])
+        goto fail;
+      nfiles++;
+      size += ALIGN_UP (grub_file_size (files[i]), 4);
+    }
+
+  initrd_mem = grub_efi_allocate_pages_max (0x3fffffff, BYTES_TO_PAGES(size));
+  if (!initrd_mem)
+    {
+      grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("can't allocate initrd"));
+      goto fail;
+    }
+
+  params->ramdisk_size = size;
+  params->ramdisk_image = (grub_uint32_t)(grub_addr_t) initrd_mem;
+
+  ptr = initrd_mem;
+
+  for (i = 0; i < nfiles; i++)
+    {
+      grub_ssize_t cursize = grub_file_size (files[i]);
+      if (grub_file_read (files[i], ptr, cursize) != cursize)
+        {
+          if (!grub_errno)
+            grub_error (GRUB_ERR_FILE_READ_ERROR, N_("premature end of file %s"),
+                        argv[i]);
+          goto fail;
+        }
+      ptr += cursize;
+      grub_memset (ptr, 0, ALIGN_UP_OVERHEAD (cursize, 4));
+      ptr += ALIGN_UP_OVERHEAD (cursize, 4);
+    }
+
+  params->ramdisk_size = size;
+
+ fail:
+  for (i = 0; i < nfiles; i++)
+    grub_file_close (files[i]);
+  grub_free (files);
+
+  if (initrd_mem && grub_errno)
+    grub_efi_free_pages ((grub_efi_physical_address_t)(grub_addr_t)initrd_mem,
+                         BYTES_TO_PAGES(size));
+
+  return grub_errno;
+}
+
+static grub_err_t
+grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
+                int argc, char *argv[])
+{
+  grub_file_t file = 0;
+  struct linux_i386_kernel_header lh;
+  grub_ssize_t len, start, filelen;
+  void *kernel = NULL;
+
+  grub_dl_ref (my_mod);
+
+  if (argc == 0)
+    {
+      grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
+      goto fail;
+    }
+
+  file = grub_file_open (argv[0], GRUB_FILE_TYPE_LINUX_KERNEL);
+  if (! file)
+    goto fail;
+
+  filelen = grub_file_size (file);
+
+  kernel = grub_malloc(filelen);
+
+  if (!kernel)
+    {
+      grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("cannot allocate kernel buffer"));
+      goto fail;
+    }
+
+  if (grub_file_read (file, kernel, filelen) != filelen)
+    {
+      grub_error (GRUB_ERR_FILE_READ_ERROR, N_("Can't read kernel %s"), argv[0]);
+      goto fail;
+    }
+
+  if (! grub_linuxefi_secure_validate (kernel, filelen))
+    {
+      grub_error (GRUB_ERR_INVALID_COMMAND, N_("%s has invalid signature"),
+                  argv[0]);
+      goto fail;
+    }
+
+  params = grub_efi_allocate_pages_max (0x3fffffff, BYTES_TO_PAGES(16384));
+
+  if (! params)
+    {
+      grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate kernel parameters");
+      goto fail;
+    }
+
+  grub_memset (params, 0, 16384);
+
+  grub_memcpy (&lh, kernel, sizeof (lh));
+
+  if (lh.boot_flag != grub_cpu_to_le16 (0xaa55))
+    {
+      grub_error (GRUB_ERR_BAD_OS, N_("invalid magic number"));
+      goto fail;
+    }
+
+  if (lh.setup_sects > GRUB_LINUX_MAX_SETUP_SECTS)
+    {
+      grub_error (GRUB_ERR_BAD_OS, N_("too many setup sectors"));
+      goto fail;
+    }
+
+  if (lh.version < grub_cpu_to_le16 (0x020b))
+    {
+      grub_error (GRUB_ERR_BAD_OS, N_("kernel too old"));
+      goto fail;
+    }
+
+  if (!lh.handover_offset)
+    {
+      grub_error (GRUB_ERR_BAD_OS, N_("kernel doesn't support EFI handover"));
+      goto fail;
+    }
+
+  grub_dprintf ("linux", "setting up cmdline\n");
+  linux_cmdline = grub_efi_allocate_pages_max(0x3fffffff,
+                                         BYTES_TO_PAGES(lh.cmdline_size + 1));
+
+  if (!linux_cmdline)
+    {
+      grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("can't allocate cmdline"));
+      goto fail;
+    }
+
+  grub_memcpy (linux_cmdline, LINUX_IMAGE, sizeof (LINUX_IMAGE));
+  grub_create_loader_cmdline (argc, argv,
+                              linux_cmdline + sizeof (LINUX_IMAGE) - 1,
+                              lh.cmdline_size - (sizeof (LINUX_IMAGE) - 1),
+                              GRUB_VERIFY_KERNEL_CMDLINE);
+
+  lh.cmd_line_ptr = (grub_uint32_t)(grub_addr_t)linux_cmdline;
+
+  handover_offset = lh.handover_offset;
+
+  start = (lh.setup_sects + 1) * 512;
+  len = grub_file_size(file) - start;
+
+  kernel_mem = grub_efi_allocate_pages_max(lh.pref_address,
+                                           BYTES_TO_PAGES(lh.init_size));
+
+  if (!kernel_mem)
+    kernel_mem = grub_efi_allocate_pages_max(0x3fffffff,
+                                             BYTES_TO_PAGES(lh.init_size));
+
+  if (!kernel_mem)
+    {
+      grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("can't allocate kernel"));
+      goto fail;
+    }
+
+  grub_memcpy (kernel_mem, (char *)kernel + start, len);
+  grub_loader_set (grub_linuxefi_boot, grub_linuxefi_unload, 0);
+  loaded=1;
+
+  lh.code32_start = (grub_uint32_t)(grub_uint64_t) kernel_mem;
+  grub_memcpy (params, &lh, 2 * 512);
+
+  params->type_of_loader = 0x21;
+
+ fail:
+
+  if (file)
+    grub_file_close (file);
+
+  if (kernel)
+    grub_free (kernel);
+
+  if (grub_errno != GRUB_ERR_NONE)
+    {
+      grub_dl_unref (my_mod);
+      loaded = 0;
+    }
+
+  if (linux_cmdline && !loaded)
+    grub_efi_free_pages ((grub_efi_physical_address_t)(grub_addr_t)
+                         linux_cmdline,
+                         BYTES_TO_PAGES(lh.cmdline_size + 1));
+
+  if (kernel_mem && !loaded)
+    grub_efi_free_pages ((grub_efi_physical_address_t)(grub_addr_t)kernel_mem,
+                         BYTES_TO_PAGES(kernel_size));
+
+  if (params && !loaded)
+    grub_efi_free_pages ((grub_efi_physical_address_t)(grub_addr_t)params,
+                         BYTES_TO_PAGES(16384));
+
+  return grub_errno;
+}
+
+static grub_command_t cmd_linux, cmd_initrd;
+static grub_command_t cmd_linuxefi, cmd_initrdefi;
+
+GRUB_MOD_INIT(linux)
+{
+  cmd_linux =
+    grub_register_command ("linux", grub_cmd_linux,
+                           0, N_("Load Linux."));
+  cmd_linuxefi =
+    grub_register_command ("linuxefi", grub_cmd_linux,
+                           0, N_("Load Linux."));
+  cmd_initrd =
+    grub_register_command ("initrd", grub_cmd_initrd,
+                           0, N_("Load initrd."));
+  cmd_initrdefi =
+    grub_register_command ("initrdefi", grub_cmd_initrd,
+                           0, N_("Load initrd."));
+  my_mod = mod;
+}
+
+GRUB_MOD_FINI(linux)
+{
+  grub_unregister_command (cmd_linux);
+  grub_unregister_command (cmd_linuxefi);
+  grub_unregister_command (cmd_initrd);
+  grub_unregister_command (cmd_initrdefi);
+}
diff --git a/grub-core/loader/i386/pc/linux.c b/grub-core/loader/i386/pc/linux.c
index 600530a742b..8593d74737f 100644
--- a/grub-core/loader/i386/pc/linux.c
+++ b/grub-core/loader/i386/pc/linux.c
@@ -483,14 +483,20 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
   return grub_errno;
 }
 
-static grub_command_t cmd_linux, cmd_initrd;
+static grub_command_t cmd_linux, cmd_linux16, cmd_initrd, cmd_initrd16;
 
 GRUB_MOD_INIT(linux16)
 {
   cmd_linux =
+    grub_register_command ("linux", grub_cmd_linux,
+			   0, N_("Load Linux."));
+  cmd_linux16 =
     grub_register_command ("linux16", grub_cmd_linux,
 			   0, N_("Load Linux."));
   cmd_initrd =
+    grub_register_command ("initrd", grub_cmd_initrd,
+			   0, N_("Load initrd."));
+  cmd_initrd16 =
     grub_register_command ("initrd16", grub_cmd_initrd,
 			   0, N_("Load initrd."));
   my_mod = mod;
@@ -499,5 +505,7 @@ GRUB_MOD_INIT(linux16)
 GRUB_MOD_FINI(linux16)
 {
   grub_unregister_command (cmd_linux);
+  grub_unregister_command (cmd_linux16);
   grub_unregister_command (cmd_initrd);
+  grub_unregister_command (cmd_initrd16);
 }
diff --git a/include/grub/efi/efi.h b/include/grub/efi/efi.h
index 3670eddc52b..83ddbe26e57 100644
--- a/include/grub/efi/efi.h
+++ b/include/grub/efi/efi.h
@@ -75,6 +75,9 @@ EXPORT_FUNC(grub_efi_allocate_fixed) (grub_efi_physical_address_t address,
 				      grub_efi_uintn_t pages);
 void *
 EXPORT_FUNC(grub_efi_allocate_any_pages) (grub_efi_uintn_t pages);
+void *
+EXPORT_FUNC(grub_efi_allocate_pages_max) (grub_efi_physical_address_t max,
+					  grub_efi_uintn_t pages);
 void EXPORT_FUNC(grub_efi_free_pages) (grub_efi_physical_address_t address,
 				       grub_efi_uintn_t pages);
 grub_efi_uintn_t EXPORT_FUNC(grub_efi_find_mmap_size) (void);
diff --git a/include/grub/efi/linux.h b/include/grub/efi/linux.h
new file mode 100644
index 00000000000..d224daafa4f
--- /dev/null
+++ b/include/grub/efi/linux.h
@@ -0,0 +1,31 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2014  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef GRUB_EFI_LINUX_HEADER
+#define GRUB_EFI_LINUX_HEADER	1
+
+#include <grub/efi/api.h>
+#include <grub/err.h>
+#include <grub/symbol.h>
+
+grub_efi_boolean_t
+EXPORT_FUNC(grub_linuxefi_secure_validate) (void *data, grub_uint32_t size);
+grub_err_t
+EXPORT_FUNC(grub_efi_linux_boot) (void *kernel_address, grub_off_t offset,
+                                  void *kernel_param);
+
+#endif /* ! GRUB_EFI_LINUX_HEADER */