82 lines
2.7 KiB
Diff
82 lines
2.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Peter Jones <pjones@redhat.com>
|
|
Date: Tue, 16 Apr 2024 12:51:50 -0600
|
|
Subject: [PATCH] pe: add the DOS header struct and fix some bad naming.
|
|
|
|
In order to properly validate a loaded kernel's support for being loaded
|
|
without a writable stack or executable, we need to be able to properly
|
|
parse arbitrary PE headers.
|
|
|
|
Currently, pe32.h is written in such a way that the MS-DOS header that
|
|
tells us where to find the PE header in the binary can't be accessed.
|
|
Further, for some reason it calls the DOS MZ magic "GRUB_PE32_MAGIC".
|
|
|
|
This patch adds the structure for the DOS header, renames the DOS magic
|
|
define, and adds defines for the actual PE magic.
|
|
|
|
Signed-off-by: Peter Jones <pjones@redhat.com>
|
|
---
|
|
grub-core/loader/efi/linux.c | 2 +-
|
|
include/grub/efi/pe32.h | 28 ++++++++++++++++++++++++++--
|
|
2 files changed, 27 insertions(+), 3 deletions(-)
|
|
|
|
diff --git a/grub-core/loader/efi/linux.c b/grub-core/loader/efi/linux.c
|
|
index cb9de5565de..ecaa8c18c4d 100644
|
|
--- a/grub-core/loader/efi/linux.c
|
|
+++ b/grub-core/loader/efi/linux.c
|
|
@@ -138,7 +138,7 @@ grub_arch_efi_linux_load_image_header (grub_file_t file,
|
|
if (grub_file_read (file, lh, sizeof (*lh)) < (grub_ssize_t) sizeof (*lh))
|
|
return grub_error(GRUB_ERR_FILE_READ_ERROR, "failed to read Linux image header");
|
|
|
|
- if ((lh->code0 & 0xffff) != GRUB_PE32_MAGIC)
|
|
+ if ((lh->code0 & 0xffff) != GRUB_DOS_MAGIC)
|
|
return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
|
|
N_("plain image kernel not supported - rebuild with CONFIG_(U)EFI_STUB enabled"));
|
|
|
|
diff --git a/include/grub/efi/pe32.h b/include/grub/efi/pe32.h
|
|
index a39743396dc..13fdd0e7d98 100644
|
|
--- a/include/grub/efi/pe32.h
|
|
+++ b/include/grub/efi/pe32.h
|
|
@@ -46,7 +46,30 @@
|
|
|
|
#define GRUB_PE32_MSDOS_STUB_SIZE 0x80
|
|
|
|
-#define GRUB_PE32_MAGIC 0x5a4d
|
|
+#define GRUB_DOS_MAGIC 0x5a4d
|
|
+
|
|
+struct grub_dos_header
|
|
+{
|
|
+ grub_uint16_t magic;
|
|
+ grub_uint16_t cblp;
|
|
+ grub_uint16_t cp;
|
|
+ grub_uint16_t crlc;
|
|
+ grub_uint16_t cparhdr;
|
|
+ grub_uint16_t minalloc;
|
|
+ grub_uint16_t maxalloc;
|
|
+ grub_uint16_t ss;
|
|
+ grub_uint16_t sp;
|
|
+ grub_uint16_t csum;
|
|
+ grub_uint16_t ip;
|
|
+ grub_uint16_t cs;
|
|
+ grub_uint16_t lfarlc;
|
|
+ grub_uint16_t ovno;
|
|
+ grub_uint16_t res0[4];
|
|
+ grub_uint16_t oemid;
|
|
+ grub_uint16_t oeminfo;
|
|
+ grub_uint16_t res1[10];
|
|
+ grub_uint32_t lfanew;
|
|
+};
|
|
|
|
struct grub_msdos_image_header
|
|
{
|
|
@@ -293,7 +316,8 @@ struct grub_pe32_section_table
|
|
#define GRUB_PE32_SCN_MEM_READ 0x40000000
|
|
#define GRUB_PE32_SCN_MEM_WRITE 0x80000000
|
|
|
|
-#define GRUB_PE32_SIGNATURE_SIZE 4
|
|
+#define GRUB_PE32_SIGNATURE_SIZE 4
|
|
+#define GRUB_PE32_SIGNATURE "PE\0\0"
|
|
|
|
#if GRUB_TARGET_SIZEOF_VOID_P == 8
|
|
#define GRUB_PE32_NATIVE_MAGIC GRUB_PE32_PE64_MAGIC
|