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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Peter Jones <pjones@redhat.com>
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Date: Fri, 25 Mar 2022 15:40:12 -0400
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Subject: [PATCH] pe: add the DOS header struct and fix some bad naming.
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In order to properly validate a loaded kernel's support for being loaded
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without a writable stack or executable, we need to be able to properly
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parse arbitrary PE headers.
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Currently, pe32.h is written in such a way that the MS-DOS header that
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tells us where to find the PE header in the binary can't be accessed.
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Further, for some reason it calls the DOS MZ magic "GRUB_PE32_MAGIC".
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This patch adds the structure for the DOS header, renames the DOS magic
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define, and adds defines for the actual PE magic.
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Signed-off-by: Peter Jones <pjones@redhat.com>
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---
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grub-core/loader/arm64/linux.c | 2 +-
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include/grub/efi/pe32.h | 28 ++++++++++++++++++++++++++--
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2 files changed, 27 insertions(+), 3 deletions(-)
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diff --git a/grub-core/loader/arm64/linux.c b/grub-core/loader/arm64/linux.c
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index d2af47c2c0..cc67f43906 100644
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--- a/grub-core/loader/arm64/linux.c
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+++ b/grub-core/loader/arm64/linux.c
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@@ -58,7 +58,7 @@ grub_arch_efi_linux_check_image (struct linux_arch_kernel_header * lh)
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if (lh->magic != GRUB_LINUX_ARMXX_MAGIC_SIGNATURE)
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return grub_error(GRUB_ERR_BAD_OS, "invalid magic number");
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- if ((lh->code0 & 0xffff) != GRUB_PE32_MAGIC)
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+ if ((lh->code0 & 0xffff) != GRUB_DOS_MAGIC)
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return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
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N_("plain image kernel not supported - rebuild with CONFIG_(U)EFI_STUB enabled"));
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diff --git a/include/grub/efi/pe32.h b/include/grub/efi/pe32.h
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index a43adf2746..2a5e1ee003 100644
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--- a/include/grub/efi/pe32.h
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+++ b/include/grub/efi/pe32.h
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@@ -46,7 +46,30 @@
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#define GRUB_PE32_MSDOS_STUB_SIZE 0x80
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-#define GRUB_PE32_MAGIC 0x5a4d
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+#define GRUB_DOS_MAGIC 0x5a4d
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+
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+struct grub_dos_header
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+{
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+ grub_uint16_t magic;
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+ grub_uint16_t cblp;
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+ grub_uint16_t cp;
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+ grub_uint16_t crlc;
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+ grub_uint16_t cparhdr;
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+ grub_uint16_t minalloc;
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+ grub_uint16_t maxalloc;
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+ grub_uint16_t ss;
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+ grub_uint16_t sp;
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+ grub_uint16_t csum;
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+ grub_uint16_t ip;
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+ grub_uint16_t cs;
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+ grub_uint16_t lfarlc;
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+ grub_uint16_t ovno;
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+ grub_uint16_t res0[4];
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+ grub_uint16_t oemid;
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+ grub_uint16_t oeminfo;
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+ grub_uint16_t res1[10];
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+ grub_uint32_t lfanew;
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+};
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/* According to the spec, the minimal alignment is 512 bytes...
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But some examples (such as EFI drivers in the Intel
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@@ -280,7 +303,8 @@ struct grub_pe32_section_table
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-#define GRUB_PE32_SIGNATURE_SIZE 4
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+#define GRUB_PE32_SIGNATURE_SIZE 4
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+#define GRUB_PE32_SIGNATURE "PE\0\0"
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struct grub_pe32_header
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{
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