From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Raymund Will <rw@suse.com>
Date: Mon, 8 Jul 2019 11:55:18 +0200
Subject: [PATCH] Add secureboot support on efi chainloader

Expand the chainloader to be able to verify the image by means of shim
lock protocol. The PE/COFF image is loaded and relocated by the
chainloader instead of calling LoadImage and StartImage UEFI boot
Service as they require positive verification result from keys enrolled
in KEK or DB. The shim will use MOK in addition to firmware enrolled
keys to verify the image.

The chainloader module could be used to load other UEFI bootloaders,
such as xen.efi, and could be signed by any of MOK, KEK or DB.

Based on https://build.opensuse.org/package/view_file/openSUSE:Factory/grub2/grub2-secureboot-chainloader.patch

Signed-off-by: Peter Jones <pjones@redhat.com>

Also:

commit cd7a8984d4fda905877b5bfe466339100156b3bc
Author: Raymund Will <rw@suse.com>
Date:   Fri Apr 10 01:45:02 2015 -0400

Use device part of chainloader target, if present.

Otherwise chainloading is restricted to '$root', which might not even
be readable by EFI!

v1. use grub_file_get_device_name() to get device name

Signed-off-by: Michael Chang <mchang@suse.com>
Signed-off-by: Peter Jones <pjones@redhat.com>

Also:

commit 0872a2310a0eeac4ecfe9e1b49dd2d72ab373039
Author: Peter Jones <pjones@redhat.com>
Date:   Fri Jun 10 14:06:15 2016 -0400

Rework even more of efi chainload so non-sb cases work right.

This ensures that if shim protocol is not loaded, or is loaded but shim
is disabled, we will fall back to a correct load method for the efi
chain loader.

Here's what I tested with this version:

results                             expected    actual
------------------------------------------------------------
sb + enabled + shim + fedora        success     success
sb + enabled + shim + win           success     success
sb + enabled + grub + fedora        fail        fail
sb + enabled + grub + win           fail        fail

sb + mokdisabled + shim + fedora    success     success
sb + mokdisabled + shim + win       success     success
sb + mokdisabled + grub + fedora    fail        fail
sb + mokdisabled + grub + win       fail        fail

sb disabled + shim + fedora         success     success*
sb disabled + shim + win            success     success*
sb disabled + grub + fedora         success     success
sb disabled + grub + win            success     success

nosb + shim + fedora                success     success*
nosb + shim + win                   success     success*
nosb + grub + fedora                success     success
nosb + grub + win                   success     success

* for some reason shim protocol is being installed in these cases, and I
  can't see why, but I think it may be this firmware build returning an
  erroneous value.  But this effectively falls back to the mokdisabled
  behavior, which works correctly, and the presence of the "grub" (i.e.
  no shim) tests effectively tests the desired behavior here.

Resolves: rhbz#1344512

Signed-off-by: Peter Jones <pjones@redhat.com>

Also:

commit ff7b1cb7f69487870211aeb69ff4f54470fbcb58
Author: Laszlo Ersek <lersek@redhat.com>
Date:   Mon Nov 21 15:34:00 2016 +0100

efi/chainloader: fix wrong sanity check in relocate_coff()

In relocate_coff(), the relocation entries are parsed from the original
image (not the section-wise copied image). The original image is
pointed-to by the "orig" pointer. The current check

  (void *)reloc_end < data

compares the addresses of independent memory allocations. "data" is a typo
here, it should be "orig".

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1347291
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Bogdan Costescu <bcostescu@gmail.com>
Tested-by: Juan Orti <j.orti.alcaine@gmail.com>

Also:

commit ab4ba9997ad4832449e54d930fa2aac6a160d0e9
Author: Laszlo Ersek <lersek@redhat.com>
Date:   Wed Nov 23 06:27:09 2016 +0100

efi/chainloader: truncate overlong relocation section

The UEFI Windows 7 boot loader ("EFI/Microsoft/Boot/bootmgfw.efi", SHA1
31b410e029bba87d2068c65a80b88882f9f8ea25) has inconsistent headers.

Compare:

> The Data Directory
> ...
> Entry 5 00000000000d9000 00000574 Base Relocation Directory [.reloc]

Versus:

> Sections:
> Idx Name      Size      VMA               LMA               File off ...
> ...
>  10 .reloc    00000e22  00000000100d9000  00000000100d9000  000a1800 ...

That is, the size reported by the RelocDir entry (0x574) is smaller than
the virtual size of the .reloc section (0xe22).

Quoting the grub2 debug log for the same:

> chainloader.c:595: reloc_dir: 0xd9000 reloc_size: 0x00000574
> chainloader.c:603: reloc_base: 0x7d208000 reloc_base_end: 0x7d208573
> ...
> chainloader.c:620: Section 10 ".reloc" at 0x7d208000..0x7d208e21
> chainloader.c:661:  section is not reloc section?
> chainloader.c:663:  rds: 0x00001000, vs: 00000e22
> chainloader.c:664:  base: 0x7d208000 end: 0x7d208e21
> chainloader.c:666:  reloc_base: 0x7d208000 reloc_base_end: 0x7d208573
> chainloader.c:671:  Section characteristics are 42000040
> chainloader.c:673:  Section virtual size: 00000e22
> chainloader.c:675:  Section raw_data size: 00001000
> chainloader.c:678:  Discarding section

After hexdumping "bootmgfw.efi" and manually walking its relocation blocks
(yes, really), I determined that the (smaller) RelocDir value is correct.
The remaining area that extends up to the .reloc section size (== 0xe22 -
0x574 == 0x8ae bytes) exists as zero padding in the file.

This zero padding shouldn't be passed to relocate_coff() for parsing. In
order to cope with it, split the handling of .reloc sections into the
following branches:

- original case (equal size): original behavior (--> relocation
  attempted),

- overlong .reloc section (longer than reported by RelocDir): truncate the
  section to the RelocDir size for the purposes of relocate_coff(), and
  attempt relocation,

- .reloc section is too short, or other checks fail: original behavior
  (--> relocation not attempted).

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1347291
Signed-off-by: Laszlo Ersek <lersek@redhat.com>

Also:

commit cc06f149fbd2d8c1da1e83173d21629ba97e0d92
Author: Raymund Will <rw@suse.com>

chainloader: Define machine types for RISC-V

The commit "Add secureboot support on efi chainloader" didn't add machine
types for RISC-V, so this patch adds them.

Note, that grub-core/loader/riscv/linux.c is skipped because Linux is not
supported yet. This patch might need a new revision once that's the case.

Signed-off-by: David Abdurachmanov <david.abdurachmanov@sifive.com>
---
 grub-core/kern/efi/efi.c           |  14 +-
 grub-core/loader/arm64/linux.c     |   4 +-
 grub-core/loader/efi/chainloader.c | 820 +++++++++++++++++++++++++++++++++----
 grub-core/loader/efi/linux.c       |  25 +-
 grub-core/loader/i386/efi/linux.c  |  17 +-
 include/grub/efi/linux.h           |   2 +-
 include/grub/efi/pe32.h            |  52 ++-
 7 files changed, 844 insertions(+), 90 deletions(-)

diff --git a/grub-core/kern/efi/efi.c b/grub-core/kern/efi/efi.c
index 35b8f670602..4a2259aa1c7 100644
--- a/grub-core/kern/efi/efi.c
+++ b/grub-core/kern/efi/efi.c
@@ -296,14 +296,20 @@ grub_efi_secure_boot (void)
   grub_efi_boolean_t ret = 0;
 
   secure_boot = grub_efi_get_variable("SecureBoot", &efi_var_guid, &datasize);
-
   if (datasize != 1 || !secure_boot)
-    goto out;
+    {
+      grub_dprintf ("secureboot", "No SecureBoot variable\n");
+      goto out;
+    }
+  grub_dprintf ("secureboot", "SecureBoot: %d\n", *secure_boot);
 
   setup_mode = grub_efi_get_variable("SetupMode", &efi_var_guid, &datasize);
-
   if (datasize != 1 || !setup_mode)
-    goto out;
+    {
+      grub_dprintf ("secureboot", "No SetupMode variable\n");
+      goto out;
+    }
+  grub_dprintf ("secureboot", "SetupMode: %d\n", *setup_mode);
 
   if (*secure_boot && !*setup_mode)
     ret = 1;
diff --git a/grub-core/loader/arm64/linux.c b/grub-core/loader/arm64/linux.c
index a312c668685..04994d5c67d 100644
--- a/grub-core/loader/arm64/linux.c
+++ b/grub-core/loader/arm64/linux.c
@@ -284,6 +284,7 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
   struct linux_arch_kernel_header lh;
   struct grub_armxx_linux_pe_header *pe;
   grub_err_t err;
+  int rc;
 
   grub_dl_ref (my_mod);
 
@@ -328,7 +329,8 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
 
   grub_dprintf ("linux", "kernel @ %p\n", kernel_addr);
 
-  if (!grub_linuxefi_secure_validate (kernel_addr, kernel_size))
+  rc = grub_linuxefi_secure_validate (kernel_addr, kernel_size);
+  if (rc < 0)
     {
       grub_error (GRUB_ERR_INVALID_COMMAND, N_("%s has invalid signature"), argv[0]);
       goto fail;
diff --git a/grub-core/loader/efi/chainloader.c b/grub-core/loader/efi/chainloader.c
index 2bd80f4db3d..e6a8d4ad0e9 100644
--- a/grub-core/loader/efi/chainloader.c
+++ b/grub-core/loader/efi/chainloader.c
@@ -32,6 +32,8 @@
 #include <grub/efi/api.h>
 #include <grub/efi/efi.h>
 #include <grub/efi/disk.h>
+#include <grub/efi/pe32.h>
+#include <grub/efi/linux.h>
 #include <grub/command.h>
 #include <grub/i18n.h>
 #include <grub/net.h>
@@ -46,9 +48,14 @@ static grub_dl_t my_mod;
 
 static grub_efi_physical_address_t address;
 static grub_efi_uintn_t pages;
+static grub_ssize_t fsize;
 static grub_efi_device_path_t *file_path;
 static grub_efi_handle_t image_handle;
 static grub_efi_char16_t *cmdline;
+static grub_ssize_t cmdline_len;
+static grub_efi_handle_t dev_handle;
+
+static grub_efi_status_t (*entry_point) (grub_efi_handle_t image_handle, grub_efi_system_table_t *system_table);
 
 static grub_err_t
 grub_chainloader_unload (void)
@@ -63,6 +70,7 @@ grub_chainloader_unload (void)
   grub_free (cmdline);
   cmdline = 0;
   file_path = 0;
+  dev_handle = 0;
 
   grub_dl_unref (my_mod);
   return GRUB_ERR_NONE;
@@ -213,20 +221,694 @@ make_file_path (grub_efi_device_path_t *dp, const char *filename)
   return file_path;
 }
 
+#define SHIM_LOCK_GUID \
+  { 0x605dab50, 0xe046, 0x4300, { 0xab,0xb6,0x3d,0xd8,0x10,0xdd,0x8b,0x23 } }
+
+typedef union
+{
+  struct grub_pe32_header_32 pe32;
+  struct grub_pe32_header_64 pe32plus;
+} grub_pe_header_t;
+
+struct pe_coff_loader_image_context
+{
+  grub_efi_uint64_t image_address;
+  grub_efi_uint64_t image_size;
+  grub_efi_uint64_t entry_point;
+  grub_efi_uintn_t size_of_headers;
+  grub_efi_uint16_t image_type;
+  grub_efi_uint16_t number_of_sections;
+  grub_efi_uint32_t section_alignment;
+  struct grub_pe32_section_table *first_section;
+  struct grub_pe32_data_directory *reloc_dir;
+  struct grub_pe32_data_directory *sec_dir;
+  grub_efi_uint64_t number_of_rva_and_sizes;
+  grub_pe_header_t *pe_hdr;
+};
+
+typedef struct pe_coff_loader_image_context pe_coff_loader_image_context_t;
+
+struct grub_efi_shim_lock
+{
+  grub_efi_status_t (*verify)(void *buffer,
+                              grub_efi_uint32_t size);
+  grub_efi_status_t (*hash)(void *data,
+                            grub_efi_int32_t datasize,
+                            pe_coff_loader_image_context_t *context,
+                            grub_efi_uint8_t *sha256hash,
+                            grub_efi_uint8_t *sha1hash);
+  grub_efi_status_t (*context)(void *data,
+                               grub_efi_uint32_t size,
+                               pe_coff_loader_image_context_t *context);
+};
+
+typedef struct grub_efi_shim_lock grub_efi_shim_lock_t;
+
+static grub_efi_boolean_t
+read_header (void *data, grub_efi_uint32_t size,
+	     pe_coff_loader_image_context_t *context)
+{
+  grub_efi_guid_t guid = SHIM_LOCK_GUID;
+  grub_efi_shim_lock_t *shim_lock;
+  grub_efi_status_t status;
+
+  shim_lock = grub_efi_locate_protocol (&guid, NULL);
+  if (!shim_lock)
+    {
+      grub_dprintf ("chain", "no shim lock protocol");
+      return 0;
+    }
+
+  status = shim_lock->context (data, size, context);
+
+  if (status == GRUB_EFI_SUCCESS)
+    {
+      grub_dprintf ("chain", "context success\n");
+      return 1;
+    }
+
+  switch (status)
+    {
+      case GRUB_EFI_UNSUPPORTED:
+      grub_error (GRUB_ERR_BAD_ARGUMENT, "context error unsupported");
+      break;
+      case GRUB_EFI_INVALID_PARAMETER:
+      grub_error (GRUB_ERR_BAD_ARGUMENT, "context error invalid parameter");
+      break;
+      default:
+      grub_error (GRUB_ERR_BAD_ARGUMENT, "context error code");
+      break;
+    }
+
+  return -1;
+}
+
+static void*
+image_address (void *image, grub_efi_uint64_t sz, grub_efi_uint64_t adr)
+{
+  if (adr > sz)
+    return NULL;
+
+  return ((grub_uint8_t*)image + adr);
+}
+
+static int
+image_is_64_bit (grub_pe_header_t *pe_hdr)
+{
+  /* .Magic is the same offset in all cases */
+  if (pe_hdr->pe32plus.optional_header.magic == GRUB_PE32_PE64_MAGIC)
+    return 1;
+  return 0;
+}
+
+static const grub_uint16_t machine_type __attribute__((__unused__)) =
+#if defined(__x86_64__)
+  GRUB_PE32_MACHINE_X86_64;
+#elif defined(__aarch64__)
+  GRUB_PE32_MACHINE_ARM64;
+#elif defined(__arm__)
+  GRUB_PE32_MACHINE_ARMTHUMB_MIXED;
+#elif defined(__i386__) || defined(__i486__) || defined(__i686__)
+  GRUB_PE32_MACHINE_I386;
+#elif defined(__ia64__)
+  GRUB_PE32_MACHINE_IA64;
+#elif defined(__riscv) && (__riscv_xlen == 32)
+  GRUB_PE32_MACHINE_RISCV32;
+#elif defined(__riscv) && (__riscv_xlen == 64)
+  GRUB_PE32_MACHINE_RISCV64;
+#else
+#error this architecture is not supported by grub2
+#endif
+
+static grub_efi_status_t
+relocate_coff (pe_coff_loader_image_context_t *context,
+	       struct grub_pe32_section_table *section,
+	       void *orig, void *data)
+{
+  struct grub_pe32_data_directory *reloc_base, *reloc_base_end;
+  grub_efi_uint64_t adjust;
+  struct grub_pe32_fixup_block *reloc, *reloc_end;
+  char *fixup, *fixup_base, *fixup_data = NULL;
+  grub_efi_uint16_t *fixup_16;
+  grub_efi_uint32_t *fixup_32;
+  grub_efi_uint64_t *fixup_64;
+  grub_efi_uint64_t size = context->image_size;
+  void *image_end = (char *)orig + size;
+  int n = 0;
+
+  if (image_is_64_bit (context->pe_hdr))
+    context->pe_hdr->pe32plus.optional_header.image_base =
+      (grub_uint64_t)(unsigned long)data;
+  else
+    context->pe_hdr->pe32.optional_header.image_base =
+      (grub_uint32_t)(unsigned long)data;
+
+  /* Alright, so here's how this works:
+   *
+   * context->reloc_dir gives us two things:
+   * - the VA the table of base relocation blocks are (maybe) to be
+   *   mapped at (reloc_dir->rva)
+   * - the virtual size (reloc_dir->size)
+   *
+   * The .reloc section (section here) gives us some other things:
+   * - the name! kind of. (section->name)
+   * - the virtual size (section->virtual_size), which should be the same
+   *   as RelocDir->Size
+   * - the virtual address (section->virtual_address)
+   * - the file section size (section->raw_data_size), which is
+   *   a multiple of optional_header->file_alignment.  Only useful for image
+   *   validation, not really useful for iteration bounds.
+   * - the file address (section->raw_data_offset)
+   * - a bunch of stuff we don't use that's 0 in our binaries usually
+   * - Flags (section->characteristics)
+   *
+   * and then the thing that's actually at the file address is an array
+   * of struct grub_pe32_fixup_block structs with some values packed behind
+   * them.  The block_size field of this structure includes the
+   * structure itself, and adding it to that structure's address will
+   * yield the next entry in the array.
+   */
+
+  reloc_base = image_address (orig, size, section->raw_data_offset);
+  reloc_base_end = image_address (orig, size, section->raw_data_offset
+				  + section->virtual_size);
+
+  grub_dprintf ("chain", "relocate_coff(): reloc_base %p reloc_base_end %p\n",
+		reloc_base, reloc_base_end);
+
+  if (!reloc_base && !reloc_base_end)
+    return GRUB_EFI_SUCCESS;
+
+  if (!reloc_base || !reloc_base_end)
+    {
+      grub_error (GRUB_ERR_BAD_ARGUMENT, "Reloc table overflows binary");
+      return GRUB_EFI_UNSUPPORTED;
+    }
+
+  adjust = (grub_uint64_t)(grub_efi_uintn_t)data - context->image_address;
+  if (adjust == 0)
+    return GRUB_EFI_SUCCESS;
+
+  while (reloc_base < reloc_base_end)
+    {
+      grub_uint16_t *entry;
+      reloc = (struct grub_pe32_fixup_block *)((char*)reloc_base);
+
+      if ((reloc_base->size == 0) ||
+	  (reloc_base->size > context->reloc_dir->size))
+	{
+	  grub_error (GRUB_ERR_BAD_ARGUMENT,
+		      "Reloc %d block size %d is invalid\n", n,
+		      reloc_base->size);
+	  return GRUB_EFI_UNSUPPORTED;
+	}
+
+      entry = &reloc->entries[0];
+      reloc_end = (struct grub_pe32_fixup_block *)
+	((char *)reloc_base + reloc_base->size);
+
+      if ((void *)reloc_end < orig || (void *)reloc_end > image_end)
+        {
+          grub_error (GRUB_ERR_BAD_ARGUMENT, "Reloc entry %d overflows binary",
+		      n);
+          return GRUB_EFI_UNSUPPORTED;
+        }
+
+      fixup_base = image_address(data, size, reloc_base->rva);
+
+      if (!fixup_base)
+        {
+          grub_error (GRUB_ERR_BAD_ARGUMENT, "Reloc %d Invalid fixupbase", n);
+          return GRUB_EFI_UNSUPPORTED;
+        }
+
+      while ((void *)entry < (void *)reloc_end)
+        {
+          fixup = fixup_base + (*entry & 0xFFF);
+          switch ((*entry) >> 12)
+            {
+              case GRUB_PE32_REL_BASED_ABSOLUTE:
+                break;
+              case GRUB_PE32_REL_BASED_HIGH:
+                fixup_16 = (grub_uint16_t *)fixup;
+                *fixup_16 = (grub_uint16_t)
+		  (*fixup_16 + ((grub_uint16_t)((grub_uint32_t)adjust >> 16)));
+                if (fixup_data != NULL)
+                  {
+                    *(grub_uint16_t *) fixup_data = *fixup_16;
+                    fixup_data = fixup_data + sizeof (grub_uint16_t);
+                  }
+                break;
+              case GRUB_PE32_REL_BASED_LOW:
+                fixup_16 = (grub_uint16_t *)fixup;
+                *fixup_16 = (grub_uint16_t) (*fixup_16 + (grub_uint16_t)adjust);
+                if (fixup_data != NULL)
+                  {
+                    *(grub_uint16_t *) fixup_data = *fixup_16;
+                    fixup_data = fixup_data + sizeof (grub_uint16_t);
+                  }
+                break;
+              case GRUB_PE32_REL_BASED_HIGHLOW:
+                fixup_32 = (grub_uint32_t *)fixup;
+                *fixup_32 = *fixup_32 + (grub_uint32_t)adjust;
+                if (fixup_data != NULL)
+                  {
+                    fixup_data = (char *)ALIGN_UP ((grub_addr_t)fixup_data, sizeof (grub_uint32_t));
+                    *(grub_uint32_t *) fixup_data = *fixup_32;
+                    fixup_data += sizeof (grub_uint32_t);
+                  }
+                break;
+              case GRUB_PE32_REL_BASED_DIR64:
+                fixup_64 = (grub_uint64_t *)fixup;
+                *fixup_64 = *fixup_64 + (grub_uint64_t)adjust;
+                if (fixup_data != NULL)
+                  {
+                    fixup_data = (char *)ALIGN_UP ((grub_addr_t)fixup_data, sizeof (grub_uint64_t));
+                    *(grub_uint64_t *) fixup_data = *fixup_64;
+                    fixup_data += sizeof (grub_uint64_t);
+                  }
+                break;
+              default:
+                grub_error (GRUB_ERR_BAD_ARGUMENT,
+			    "Reloc %d unknown relocation type %d",
+			    n, (*entry) >> 12);
+                return GRUB_EFI_UNSUPPORTED;
+            }
+          entry += 1;
+        }
+      reloc_base = (struct grub_pe32_data_directory *)reloc_end;
+      n++;
+    }
+
+  return GRUB_EFI_SUCCESS;
+}
+
+static grub_efi_device_path_t *
+grub_efi_get_media_file_path (grub_efi_device_path_t *dp)
+{
+  while (1)
+    {
+      grub_efi_uint8_t type = GRUB_EFI_DEVICE_PATH_TYPE (dp);
+      grub_efi_uint8_t subtype = GRUB_EFI_DEVICE_PATH_SUBTYPE (dp);
+
+      if (type == GRUB_EFI_END_DEVICE_PATH_TYPE)
+        break;
+      else if (type == GRUB_EFI_MEDIA_DEVICE_PATH_TYPE
+            && subtype == GRUB_EFI_FILE_PATH_DEVICE_PATH_SUBTYPE)
+      return dp;
+
+      dp = GRUB_EFI_NEXT_DEVICE_PATH (dp);
+    }
+
+    return NULL;
+}
+
+static grub_efi_boolean_t
+handle_image (void *data, grub_efi_uint32_t datasize)
+{
+  grub_efi_boot_services_t *b;
+  grub_efi_loaded_image_t *li, li_bak;
+  grub_efi_status_t efi_status;
+  char *buffer = NULL;
+  char *buffer_aligned = NULL;
+  grub_efi_uint32_t i;
+  struct grub_pe32_section_table *section;
+  char *base, *end;
+  pe_coff_loader_image_context_t context;
+  grub_uint32_t section_alignment;
+  grub_uint32_t buffer_size;
+  int found_entry_point = 0;
+  int rc;
+
+  b = grub_efi_system_table->boot_services;
+
+  rc = read_header (data, datasize, &context);
+  if (rc < 0)
+    {
+      grub_dprintf ("chain", "Failed to read header\n");
+      goto error_exit;
+    }
+  else if (rc == 0)
+    {
+      grub_dprintf ("chain", "Secure Boot is not enabled\n");
+      return 0;
+    }
+  else
+    {
+      grub_dprintf ("chain", "Header read without error\n");
+    }
+
+  /*
+   * The spec says, uselessly, of SectionAlignment:
+   * =====
+   * The alignment (in bytes) of sections when they are loaded into
+   * memory. It must be greater than or equal to FileAlignment. The
+   * default is the page size for the architecture.
+   * =====
+   * Which doesn't tell you whose responsibility it is to enforce the
+   * "default", or when.  It implies that the value in the field must
+   * be > FileAlignment (also poorly defined), but it appears visual
+   * studio will happily write 512 for FileAlignment (its default) and
+   * 0 for SectionAlignment, intending to imply PAGE_SIZE.
+   *
+   * We only support one page size, so if it's zero, nerf it to 4096.
+   */
+  section_alignment = context.section_alignment;
+  if (section_alignment == 0)
+    section_alignment = 4096;
+
+  buffer_size = context.image_size + section_alignment;
+  grub_dprintf ("chain", "image size is %08"PRIxGRUB_UINT64_T", datasize is %08x\n",
+	       context.image_size, datasize);
+
+  efi_status = efi_call_3 (b->allocate_pool, GRUB_EFI_LOADER_DATA,
+			   buffer_size, &buffer);
+
+  if (efi_status != GRUB_EFI_SUCCESS)
+    {
+      grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
+      goto error_exit;
+    }
+
+  buffer_aligned = (char *)ALIGN_UP ((grub_addr_t)buffer, section_alignment);
+  if (!buffer_aligned)
+    {
+      grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
+      goto error_exit;
+    }
+
+  grub_memcpy (buffer_aligned, data, context.size_of_headers);
+
+  entry_point = image_address (buffer_aligned, context.image_size,
+			       context.entry_point);
+
+  grub_dprintf ("chain", "entry_point: %p\n", entry_point);
+  if (!entry_point)
+    {
+      grub_error (GRUB_ERR_BAD_ARGUMENT, "invalid entry point");
+      goto error_exit;
+    }
+
+  char *reloc_base, *reloc_base_end;
+  grub_dprintf ("chain", "reloc_dir: %p reloc_size: 0x%08x\n",
+		(void *)(unsigned long)context.reloc_dir->rva,
+		context.reloc_dir->size);
+  reloc_base = image_address (buffer_aligned, context.image_size,
+			      context.reloc_dir->rva);
+  /* RelocBaseEnd here is the address of the last byte of the table */
+  reloc_base_end = image_address (buffer_aligned, context.image_size,
+				  context.reloc_dir->rva
+				  + context.reloc_dir->size - 1);
+  grub_dprintf ("chain", "reloc_base: %p reloc_base_end: %p\n",
+		reloc_base, reloc_base_end);
+
+  struct grub_pe32_section_table *reloc_section = NULL, fake_reloc_section;
+
+  section = context.first_section;
+  for (i = 0; i < context.number_of_sections; i++, section++)
+    {
+      char name[9];
+
+      base = image_address (buffer_aligned, context.image_size,
+			    section->virtual_address);
+      end = image_address (buffer_aligned, context.image_size,
+			   section->virtual_address + section->virtual_size -1);
+
+      grub_strncpy(name, section->name, 9);
+      name[8] = '\0';
+      grub_dprintf ("chain", "Section %d \"%s\" at %p..%p\n", i,
+		   name, base, end);
+
+      if (end < base)
+	{
+	  grub_dprintf ("chain", " base is %p but end is %p... bad.\n",
+		       base, end);
+	  grub_error (GRUB_ERR_BAD_ARGUMENT,
+		      "Image has invalid negative size");
+	  goto error_exit;
+	}
+
+      if (section->virtual_address <= context.entry_point &&
+	  (section->virtual_address + section->raw_data_size - 1)
+	  > context.entry_point)
+	{
+	  found_entry_point++;
+	  grub_dprintf ("chain", " section contains entry point\n");
+	}
+
+      /* We do want to process .reloc, but it's often marked
+       * discardable, so we don't want to memcpy it. */
+      if (grub_memcmp (section->name, ".reloc\0\0", 8) == 0)
+	{
+	  if (reloc_section)
+	    {
+	      grub_error (GRUB_ERR_BAD_ARGUMENT,
+			  "Image has multiple relocation sections");
+	      goto error_exit;
+	    }
+
+	  /* If it has nonzero sizes, and our bounds check
+	   * made sense, and the VA and size match RelocDir's
+	   * versions, then we believe in this section table. */
+	  if (section->raw_data_size && section->virtual_size &&
+	      base && end && reloc_base == base)
+	    {
+	      if (reloc_base_end == end)
+		{
+		  grub_dprintf ("chain", " section is relocation section\n");
+		  reloc_section = section;
+		}
+	      else if (reloc_base_end && reloc_base_end < end)
+	        {
+		  /* Bogus virtual size in the reloc section -- RelocDir
+		   * reported a smaller Base Relocation Directory. Decrease
+		   * the section's virtual size so that it equal RelocDir's
+		   * idea, but only for the purposes of relocate_coff(). */
+		  grub_dprintf ("chain",
+				" section is (overlong) relocation section\n");
+		  grub_memcpy (&fake_reloc_section, section, sizeof *section);
+		  fake_reloc_section.virtual_size -= (end - reloc_base_end);
+		  reloc_section = &fake_reloc_section;
+		}
+	    }
+
+	  if (!reloc_section)
+	    {
+	      grub_dprintf ("chain", " section is not reloc section?\n");
+	      grub_dprintf ("chain", " rds: 0x%08x, vs: %08x\n",
+			    section->raw_data_size, section->virtual_size);
+	      grub_dprintf ("chain", " base: %p end: %p\n", base, end);
+	      grub_dprintf ("chain", " reloc_base: %p reloc_base_end: %p\n",
+			    reloc_base, reloc_base_end);
+	    }
+	}
+
+      grub_dprintf ("chain", " Section characteristics are %08x\n",
+		   section->characteristics);
+      grub_dprintf ("chain", " Section virtual size: %08x\n",
+		   section->virtual_size);
+      grub_dprintf ("chain", " Section raw_data size: %08x\n",
+		   section->raw_data_size);
+      if (section->characteristics & GRUB_PE32_SCN_MEM_DISCARDABLE)
+	{
+	  grub_dprintf ("chain", " Discarding section\n");
+	  continue;
+	}
+
+      if (!base || !end)
+        {
+	  grub_dprintf ("chain", " section is invalid\n");
+          grub_error (GRUB_ERR_BAD_ARGUMENT, "Invalid section size");
+          goto error_exit;
+        }
+
+      if (section->characteristics & GRUB_PE32_SCN_CNT_UNINITIALIZED_DATA)
+	{
+	  if (section->raw_data_size != 0)
+	    grub_dprintf ("chain", " UNINITIALIZED_DATA section has data?\n");
+	}
+      else if (section->virtual_address < context.size_of_headers ||
+	       section->raw_data_offset < context.size_of_headers)
+	{
+	  grub_error (GRUB_ERR_BAD_ARGUMENT,
+		      "Section %d is inside image headers", i);
+	  goto error_exit;
+	}
+
+      if (section->raw_data_size > 0)
+	{
+	  grub_dprintf ("chain", " copying 0x%08x bytes to %p\n",
+			section->raw_data_size, base);
+	  grub_memcpy (base,
+		       (grub_efi_uint8_t*)data + section->raw_data_offset,
+		       section->raw_data_size);
+	}
+
+      if (section->raw_data_size < section->virtual_size)
+	{
+	  grub_dprintf ("chain", " padding with 0x%08x bytes at %p\n",
+			section->virtual_size - section->raw_data_size,
+			base + section->raw_data_size);
+	  grub_memset (base + section->raw_data_size, 0,
+		       section->virtual_size - section->raw_data_size);
+	}
+
+      grub_dprintf ("chain", " finished section %s\n", name);
+    }
+
+  /* 5 == EFI_IMAGE_DIRECTORY_ENTRY_BASERELOC */
+  if (context.number_of_rva_and_sizes <= 5)
+    {
+      grub_dprintf ("chain", "image has no relocation entry\n");
+      goto error_exit;
+    }
+
+  if (context.reloc_dir->size && reloc_section)
+    {
+      /* run the relocation fixups */
+      efi_status = relocate_coff (&context, reloc_section, data,
+				  buffer_aligned);
+
+      if (efi_status != GRUB_EFI_SUCCESS)
+	{
+	  grub_error (GRUB_ERR_BAD_ARGUMENT, "relocation failed");
+	  goto error_exit;
+	}
+    }
+
+  if (!found_entry_point)
+    {
+      grub_error (GRUB_ERR_BAD_ARGUMENT, "entry point is not within sections");
+      goto error_exit;
+    }
+  if (found_entry_point > 1)
+    {
+      grub_error (GRUB_ERR_BAD_ARGUMENT, "%d sections contain entry point",
+		  found_entry_point);
+      goto error_exit;
+    }
+
+  li = grub_efi_get_loaded_image (grub_efi_image_handle);
+  if (!li)
+    {
+      grub_error (GRUB_ERR_BAD_ARGUMENT, "no loaded image available");
+      goto error_exit;
+    }
+
+  grub_memcpy (&li_bak, li, sizeof (grub_efi_loaded_image_t));
+  li->image_base = buffer_aligned;
+  li->image_size = context.image_size;
+  li->load_options = cmdline;
+  li->load_options_size = cmdline_len;
+  li->file_path = grub_efi_get_media_file_path (file_path);
+  li->device_handle = dev_handle;
+  if (!li->file_path)
+    {
+      grub_error (GRUB_ERR_UNKNOWN_DEVICE, "no matching file path found");
+      goto error_exit;
+    }
+
+  grub_dprintf ("chain", "booting via entry point\n");
+  efi_status = efi_call_2 (entry_point, grub_efi_image_handle,
+			   grub_efi_system_table);
+
+  grub_dprintf ("chain", "entry_point returned %ld\n", efi_status);
+  grub_memcpy (li, &li_bak, sizeof (grub_efi_loaded_image_t));
+  efi_status = efi_call_1 (b->free_pool, buffer);
+
+  return 1;
+
+error_exit:
+  grub_dprintf ("chain", "error_exit: grub_errno: %d\n", grub_errno);
+  if (buffer)
+      efi_call_1 (b->free_pool, buffer);
+
+  return 0;
+}
+
+static grub_err_t
+grub_secureboot_chainloader_unload (void)
+{
+  grub_efi_boot_services_t *b;
+
+  b = grub_efi_system_table->boot_services;
+  efi_call_2 (b->free_pages, address, pages);
+  grub_free (file_path);
+  grub_free (cmdline);
+  cmdline = 0;
+  file_path = 0;
+  dev_handle = 0;
+
+  grub_dl_unref (my_mod);
+  return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+grub_load_and_start_image(void *boot_image)
+{
+  grub_efi_boot_services_t *b;
+  grub_efi_status_t status;
+  grub_efi_loaded_image_t *loaded_image;
+
+  b = grub_efi_system_table->boot_services;
+
+  status = efi_call_6 (b->load_image, 0, grub_efi_image_handle, file_path,
+		       boot_image, fsize, &image_handle);
+  if (status != GRUB_EFI_SUCCESS)
+    {
+      if (status == GRUB_EFI_OUT_OF_RESOURCES)
+	grub_error (GRUB_ERR_OUT_OF_MEMORY, "out of resources");
+      else
+	grub_error (GRUB_ERR_BAD_OS, "cannot load image");
+      return -1;
+    }
+
+  /* LoadImage does not set a device handler when the image is
+     loaded from memory, so it is necessary to set it explicitly here.
+     This is a mess.  */
+  loaded_image = grub_efi_get_loaded_image (image_handle);
+  if (! loaded_image)
+    {
+      grub_error (GRUB_ERR_BAD_OS, "no loaded image available");
+      return -1;
+    }
+  loaded_image->device_handle = dev_handle;
+
+  if (cmdline)
+    {
+      loaded_image->load_options = cmdline;
+      loaded_image->load_options_size = cmdline_len;
+    }
+
+  return 0;
+}
+
+static grub_err_t
+grub_secureboot_chainloader_boot (void)
+{
+  int rc;
+  rc = handle_image ((void *)(unsigned long)address, fsize);
+  if (rc == 0)
+    {
+      grub_load_and_start_image((void *)(unsigned long)address);
+    }
+
+  grub_loader_unset ();
+  return grub_errno;
+}
+
 static grub_err_t
 grub_cmd_chainloader (grub_command_t cmd __attribute__ ((unused)),
 		      int argc, char *argv[])
 {
   grub_file_t file = 0;
-  grub_ssize_t size;
   grub_efi_status_t status;
   grub_efi_boot_services_t *b;
   grub_device_t dev = 0;
   grub_efi_device_path_t *dp = 0;
-  grub_efi_loaded_image_t *loaded_image;
   char *filename;
   void *boot_image = 0;
-  grub_efi_handle_t dev_handle = 0;
+  int rc;
 
   if (argc == 0)
     return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
@@ -238,15 +920,45 @@ grub_cmd_chainloader (grub_command_t cmd __attribute__ ((unused)),
   address = 0;
   image_handle = 0;
   file_path = 0;
+  dev_handle = 0;
 
   b = grub_efi_system_table->boot_services;
 
+  if (argc > 1)
+    {
+      int i;
+      grub_efi_char16_t *p16;
+
+      for (i = 1, cmdline_len = 0; i < argc; i++)
+        cmdline_len += grub_strlen (argv[i]) + 1;
+
+      cmdline_len *= sizeof (grub_efi_char16_t);
+      cmdline = p16 = grub_malloc (cmdline_len);
+      if (! cmdline)
+        goto fail;
+
+      for (i = 1; i < argc; i++)
+        {
+          char *p8;
+
+          p8 = argv[i];
+          while (*p8)
+            *(p16++) = *(p8++);
+
+          *(p16++) = ' ';
+        }
+      *(--p16) = 0;
+    }
+
   file = grub_file_open (filename, GRUB_FILE_TYPE_EFI_CHAINLOADED_IMAGE);
   if (! file)
     goto fail;
 
-  /* Get the root device's device path.  */
-  dev = grub_device_open (0);
+  /* Get the device path from filename. */
+  char *devname = grub_file_get_device_name (filename);
+  dev = grub_device_open (devname);
+  if (devname)
+    grub_free (devname);
   if (! dev)
     goto fail;
 
@@ -283,17 +995,14 @@ grub_cmd_chainloader (grub_command_t cmd __attribute__ ((unused)),
   if (! file_path)
     goto fail;
 
-  grub_printf ("file path: ");
-  grub_efi_print_device_path (file_path);
-
-  size = grub_file_size (file);
-  if (!size)
+  fsize = grub_file_size (file);
+  if (!fsize)
     {
       grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
 		  filename);
       goto fail;
     }
-  pages = (((grub_efi_uintn_t) size + ((1 << 12) - 1)) >> 12);
+  pages = (((grub_efi_uintn_t) fsize + ((1 << 12) - 1)) >> 12);
 
   status = efi_call_4 (b->allocate_pages, GRUB_EFI_ALLOCATE_ANY_PAGES,
 			      GRUB_EFI_LOADER_CODE,
@@ -307,7 +1016,7 @@ grub_cmd_chainloader (grub_command_t cmd __attribute__ ((unused)),
     }
 
   boot_image = (void *) ((grub_addr_t) address);
-  if (grub_file_read (file, boot_image, size) != size)
+  if (grub_file_read (file, boot_image, fsize) != fsize)
     {
       if (grub_errno == GRUB_ERR_NONE)
 	grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
@@ -317,7 +1026,7 @@ grub_cmd_chainloader (grub_command_t cmd __attribute__ ((unused)),
     }
 
 #if defined (__i386__) || defined (__x86_64__)
-  if (size >= (grub_ssize_t) sizeof (struct grub_macho_fat_header))
+  if (fsize >= (grub_ssize_t) sizeof (struct grub_macho_fat_header))
     {
       struct grub_macho_fat_header *head = boot_image;
       if (head->magic
@@ -326,6 +1035,14 @@ grub_cmd_chainloader (grub_command_t cmd __attribute__ ((unused)),
 	  grub_uint32_t i;
 	  struct grub_macho_fat_arch *archs
 	    = (struct grub_macho_fat_arch *) (head + 1);
+
+	  if (grub_efi_get_secureboot () == GRUB_EFI_SECUREBOOT_MODE_ENABLED)
+	    {
+	      grub_error (GRUB_ERR_BAD_OS,
+			  "MACHO binaries are forbidden with Secure Boot");
+	      goto fail;
+	    }
+
 	  for (i = 0; i < grub_cpu_to_le32 (head->nfat_arch); i++)
 	    {
 	      if (GRUB_MACHO_CPUTYPE_IS_HOST_CURRENT (archs[i].cputype))
@@ -340,79 +1057,39 @@ grub_cmd_chainloader (grub_command_t cmd __attribute__ ((unused)),
 	      > ~grub_cpu_to_le32 (archs[i].size)
 	      || grub_cpu_to_le32 (archs[i].offset)
 	      + grub_cpu_to_le32 (archs[i].size)
-	      > (grub_size_t) size)
+	      > (grub_size_t) fsize)
 	    {
 	      grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
 			  filename);
 	      goto fail;
 	    }
 	  boot_image = (char *) boot_image + grub_cpu_to_le32 (archs[i].offset);
-	  size = grub_cpu_to_le32 (archs[i].size);
+	  fsize = grub_cpu_to_le32 (archs[i].size);
 	}
     }
 #endif
 
-  status = efi_call_6 (b->load_image, 0, grub_efi_image_handle, file_path,
-		       boot_image, size,
-		       &image_handle);
-  if (status != GRUB_EFI_SUCCESS)
+  rc = grub_linuxefi_secure_validate((void *)(unsigned long)address, fsize);
+  grub_dprintf ("chain", "linuxefi_secure_validate: %d\n", rc);
+  if (rc > 0)
     {
-      if (status == GRUB_EFI_OUT_OF_RESOURCES)
-	grub_error (GRUB_ERR_OUT_OF_MEMORY, "out of resources");
-      else
-	grub_error (GRUB_ERR_BAD_OS, "cannot load image");
-
-      goto fail;
+      grub_file_close (file);
+      grub_device_close (dev);
+      grub_loader_set (grub_secureboot_chainloader_boot,
+		       grub_secureboot_chainloader_unload, 0);
+      return 0;
     }
-
-  /* LoadImage does not set a device handler when the image is
-     loaded from memory, so it is necessary to set it explicitly here.
-     This is a mess.  */
-  loaded_image = grub_efi_get_loaded_image (image_handle);
-  if (! loaded_image)
+  else if (rc == 0)
     {
-      grub_error (GRUB_ERR_BAD_OS, "no loaded image available");
-      goto fail;
-    }
-  loaded_image->device_handle = dev_handle;
-
-  if (argc > 1)
-    {
-      int i, len;
-      grub_efi_char16_t *p16;
-
-      for (i = 1, len = 0; i < argc; i++)
-        len += grub_strlen (argv[i]) + 1;
-
-      len *= sizeof (grub_efi_char16_t);
-      cmdline = p16 = grub_malloc (len);
-      if (! cmdline)
-        goto fail;
+      grub_load_and_start_image(boot_image);
+      grub_file_close (file);
+      grub_device_close (dev);
+      grub_loader_set (grub_chainloader_boot, grub_chainloader_unload, 0);
 
-      for (i = 1; i < argc; i++)
-        {
-          char *p8;
-
-          p8 = argv[i];
-          while (*p8)
-            *(p16++) = *(p8++);
-
-          *(p16++) = ' ';
-        }
-      *(--p16) = 0;
-
-      loaded_image->load_options = cmdline;
-      loaded_image->load_options_size = len;
+      return 0;
     }
 
-  grub_file_close (file);
-  grub_device_close (dev);
-
-  grub_loader_set (grub_chainloader_boot, grub_chainloader_unload, 0);
-  return 0;
-
- fail:
-
+fail:
   if (dev)
     grub_device_close (dev);
 
@@ -424,6 +1101,9 @@ grub_cmd_chainloader (grub_command_t cmd __attribute__ ((unused)),
   if (address)
     efi_call_2 (b->free_pages, address, pages);
 
+  if (cmdline)
+    grub_free (cmdline);
+
   grub_dl_unref (my_mod);
 
   return grub_errno;
diff --git a/grub-core/loader/efi/linux.c b/grub-core/loader/efi/linux.c
index c24202a5dd1..c8ecce6dfd0 100644
--- a/grub-core/loader/efi/linux.c
+++ b/grub-core/loader/efi/linux.c
@@ -33,21 +33,34 @@ struct grub_efi_shim_lock
 };
 typedef struct grub_efi_shim_lock grub_efi_shim_lock_t;
 
-grub_efi_boolean_t
+int
 grub_linuxefi_secure_validate (void *data, grub_uint32_t size)
 {
   grub_efi_guid_t guid = SHIM_LOCK_GUID;
   grub_efi_shim_lock_t *shim_lock;
+  grub_efi_status_t status;
 
   shim_lock = grub_efi_locate_protocol(&guid, NULL);
-
+  grub_dprintf ("secureboot", "shim_lock: %p\n", shim_lock);
   if (!shim_lock)
-    return 1;
+    {
+      grub_dprintf ("secureboot", "shim not available\n");
+      return 0;
+    }
 
-  if (shim_lock->verify(data, size) == GRUB_EFI_SUCCESS)
-    return 1;
+  grub_dprintf ("secureboot", "Asking shim to verify kernel signature\n");
+  status = shim_lock->verify (data, size);
+  grub_dprintf ("secureboot", "shim_lock->verify(): %ld\n", (long int)status);
+  if (status == GRUB_EFI_SUCCESS)
+    {
+      grub_dprintf ("secureboot", "Kernel signature verification passed\n");
+      return 1;
+    }
 
-  return 0;
+  grub_dprintf ("secureboot", "Kernel signature verification failed (0x%lx)\n",
+		(unsigned long) status);
+
+  return -1;
 }
 
 #pragma GCC diagnostic push
diff --git a/grub-core/loader/i386/efi/linux.c b/grub-core/loader/i386/efi/linux.c
index bb2616a8092..6b24cbb9483 100644
--- a/grub-core/loader/i386/efi/linux.c
+++ b/grub-core/loader/i386/efi/linux.c
@@ -117,6 +117,8 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
       goto fail;
     }
 
+  grub_dprintf ("linux", "initrd_mem = %lx\n", (unsigned long) initrd_mem);
+
   params->ramdisk_size = size;
   params->ramdisk_image = (grub_uint32_t)(grub_addr_t) initrd_mem;
 
@@ -159,6 +161,7 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
   struct linux_i386_kernel_header lh;
   grub_ssize_t len, start, filelen;
   void *kernel = NULL;
+  int rc;
 
   grub_dl_ref (my_mod);
 
@@ -184,11 +187,13 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
 
   if (grub_file_read (file, kernel, filelen) != filelen)
     {
-      grub_error (GRUB_ERR_FILE_READ_ERROR, N_("Can't read kernel %s"), argv[0]);
+      grub_error (GRUB_ERR_FILE_READ_ERROR, N_("Can't read kernel %s"),
+		  argv[0]);
       goto fail;
     }
 
-  if (! grub_linuxefi_secure_validate (kernel, filelen))
+  rc = grub_linuxefi_secure_validate (kernel, filelen);
+  if (rc < 0)
     {
       grub_error (GRUB_ERR_INVALID_COMMAND, N_("%s has invalid signature"),
 		  argv[0]);
@@ -203,6 +208,8 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
       goto fail;
     }
 
+  grub_dprintf ("linux", "params = %lx\n", (unsigned long) params);
+
   grub_memset (params, 0, 16384);
 
   grub_memcpy (&lh, kernel, sizeof (lh));
@@ -241,6 +248,9 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
       goto fail;
     }
 
+  grub_dprintf ("linux", "linux_cmdline = %lx\n",
+		(unsigned long)linux_cmdline);
+
   grub_memcpy (linux_cmdline, LINUX_IMAGE, sizeof (LINUX_IMAGE));
   grub_create_loader_cmdline (argc, argv,
                               linux_cmdline + sizeof (LINUX_IMAGE) - 1,
@@ -275,9 +285,10 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
   grub_memcpy (params, &lh, 2 * 512);
 
   params->type_of_loader = 0x21;
+  grub_dprintf("linux", "kernel_mem: %p handover_offset: %08x\n",
+	       kernel_mem, handover_offset);
 
  fail:
-
   if (file)
     grub_file_close (file);
 
diff --git a/include/grub/efi/linux.h b/include/grub/efi/linux.h
index d9ede36773b..0033d9305a9 100644
--- a/include/grub/efi/linux.h
+++ b/include/grub/efi/linux.h
@@ -22,7 +22,7 @@
 #include <grub/err.h>
 #include <grub/symbol.h>
 
-grub_efi_boolean_t
+int
 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,
diff --git a/include/grub/efi/pe32.h b/include/grub/efi/pe32.h
index 0ed8781f037..a43adf27464 100644
--- a/include/grub/efi/pe32.h
+++ b/include/grub/efi/pe32.h
@@ -223,7 +223,11 @@ struct grub_pe64_optional_header
 struct grub_pe32_section_table
 {
   char name[8];
-  grub_uint32_t virtual_size;
+  union
+    {
+      grub_uint32_t physical_address;
+      grub_uint32_t virtual_size;
+    };
   grub_uint32_t virtual_address;
   grub_uint32_t raw_data_size;
   grub_uint32_t raw_data_offset;
@@ -234,12 +238,18 @@ struct grub_pe32_section_table
   grub_uint32_t characteristics;
 };
 
+#define GRUB_PE32_SCN_TYPE_NO_PAD		0x00000008
 #define GRUB_PE32_SCN_CNT_CODE			0x00000020
 #define GRUB_PE32_SCN_CNT_INITIALIZED_DATA	0x00000040
-#define GRUB_PE32_SCN_MEM_DISCARDABLE		0x02000000
-#define GRUB_PE32_SCN_MEM_EXECUTE		0x20000000
-#define GRUB_PE32_SCN_MEM_READ			0x40000000
-#define GRUB_PE32_SCN_MEM_WRITE			0x80000000
+#define GRUB_PE32_SCN_CNT_UNINITIALIZED_DATA	0x00000080
+#define GRUB_PE32_SCN_LNK_OTHER			0x00000100
+#define GRUB_PE32_SCN_LNK_INFO			0x00000200
+#define GRUB_PE32_SCN_LNK_REMOVE		0x00000800
+#define GRUB_PE32_SCN_LNK_COMDAT		0x00001000
+#define GRUB_PE32_SCN_GPREL			0x00008000
+#define GRUB_PE32_SCN_MEM_16BIT			0x00020000
+#define GRUB_PE32_SCN_MEM_LOCKED		0x00040000
+#define GRUB_PE32_SCN_MEM_PRELOAD		0x00080000
 
 #define GRUB_PE32_SCN_ALIGN_1BYTES		0x00100000
 #define GRUB_PE32_SCN_ALIGN_2BYTES		0x00200000
@@ -248,10 +258,28 @@ struct grub_pe32_section_table
 #define GRUB_PE32_SCN_ALIGN_16BYTES		0x00500000
 #define GRUB_PE32_SCN_ALIGN_32BYTES		0x00600000
 #define GRUB_PE32_SCN_ALIGN_64BYTES		0x00700000
+#define GRUB_PE32_SCN_ALIGN_128BYTES		0x00800000
+#define GRUB_PE32_SCN_ALIGN_256BYTES		0x00900000
+#define GRUB_PE32_SCN_ALIGN_512BYTES		0x00A00000
+#define GRUB_PE32_SCN_ALIGN_1024BYTES		0x00B00000
+#define GRUB_PE32_SCN_ALIGN_2048BYTES		0x00C00000
+#define GRUB_PE32_SCN_ALIGN_4096BYTES		0x00D00000
+#define GRUB_PE32_SCN_ALIGN_8192BYTES		0x00E00000
 
 #define GRUB_PE32_SCN_ALIGN_SHIFT		20
 #define GRUB_PE32_SCN_ALIGN_MASK		7
 
+#define GRUB_PE32_SCN_LNK_NRELOC_OVFL		0x01000000
+#define GRUB_PE32_SCN_MEM_DISCARDABLE		0x02000000
+#define GRUB_PE32_SCN_MEM_NOT_CACHED		0x04000000
+#define GRUB_PE32_SCN_MEM_NOT_PAGED		0x08000000
+#define GRUB_PE32_SCN_MEM_SHARED		0x10000000
+#define GRUB_PE32_SCN_MEM_EXECUTE		0x20000000
+#define GRUB_PE32_SCN_MEM_READ			0x40000000
+#define GRUB_PE32_SCN_MEM_WRITE			0x80000000
+
+
+
 #define GRUB_PE32_SIGNATURE_SIZE 4
 
 struct grub_pe32_header
@@ -274,6 +302,20 @@ struct grub_pe32_header
 #endif
 };
 
+struct grub_pe32_header_32
+{
+  char signature[GRUB_PE32_SIGNATURE_SIZE];
+  struct grub_pe32_coff_header coff_header;
+  struct grub_pe32_optional_header optional_header;
+};
+
+struct grub_pe32_header_64
+{
+  char signature[GRUB_PE32_SIGNATURE_SIZE];
+  struct grub_pe32_coff_header coff_header;
+  struct grub_pe64_optional_header optional_header;
+};
+
 struct grub_pe32_fixup_block
 {
   grub_uint32_t page_rva;