354 lines
13 KiB
Diff
354 lines
13 KiB
Diff
From 982d11a87ce05b6e4305b03a29945843311007d0 Mon Sep 17 00:00:00 2001
|
|
From: Peter Jones <pjones@redhat.com>
|
|
Date: Thu, 9 Jun 2016 12:22:29 -0400
|
|
Subject: [PATCH 159/198] Re-work some intricacies of PE loading.
|
|
|
|
The PE spec is not a well written document, and awesomely every place
|
|
where there's an ambiguous way to read something, Windows' bootmgfw.efi
|
|
takes a different read than either of them.
|
|
---
|
|
grub-core/loader/efi/chainloader.c | 156 +++++++++++++++++++++++++++++--------
|
|
include/grub/efi/pe32.h | 32 +++++++-
|
|
2 files changed, 152 insertions(+), 36 deletions(-)
|
|
|
|
diff --git a/grub-core/loader/efi/chainloader.c b/grub-core/loader/efi/chainloader.c
|
|
index aee8e6bec..4b77a7d5a 100644
|
|
--- a/grub-core/loader/efi/chainloader.c
|
|
+++ b/grub-core/loader/efi/chainloader.c
|
|
@@ -301,7 +301,7 @@ image_is_64_bit (grub_pe_header_t *pe_hdr)
|
|
return 0;
|
|
}
|
|
|
|
-static const grub_uint16_t machine_type =
|
|
+static const grub_uint16_t machine_type __attribute__((__unused__)) =
|
|
#if defined(__x86_64__)
|
|
GRUB_PE32_MACHINE_X86_64;
|
|
#elif defined(__aarch64__)
|
|
@@ -367,10 +367,10 @@ relocate_coff (pe_coff_loader_image_context_t *context,
|
|
|
|
reloc_base = image_address (orig, size, section->raw_data_offset);
|
|
reloc_base_end = image_address (orig, size, section->raw_data_offset
|
|
- + section->virtual_size - 1);
|
|
+ + section->virtual_size);
|
|
|
|
- grub_dprintf ("chain", "reloc_base %p reloc_base_end %p\n", reloc_base,
|
|
- reloc_base_end);
|
|
+ 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;
|
|
@@ -507,12 +507,13 @@ handle_image (void *data, grub_efi_uint32_t datasize)
|
|
grub_efi_status_t efi_status;
|
|
char *buffer = NULL;
|
|
char *buffer_aligned = NULL;
|
|
- grub_efi_uint32_t i, size;
|
|
+ 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;
|
|
|
|
b = grub_efi_system_table->boot_services;
|
|
|
|
@@ -526,8 +527,28 @@ handle_image (void *data, grub_efi_uint32_t datasize)
|
|
goto error_exit;
|
|
}
|
|
|
|
+ /*
|
|
+ * 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 %08lx, datasize is %08x\n",
|
|
+ context.image_size, datasize);
|
|
|
|
efi_status = efi_call_3 (b->allocate_pool, GRUB_EFI_LOADER_DATA,
|
|
buffer_size, &buffer);
|
|
@@ -539,7 +560,6 @@ handle_image (void *data, grub_efi_uint32_t datasize)
|
|
}
|
|
|
|
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"));
|
|
@@ -548,27 +568,62 @@ handle_image (void *data, grub_efi_uint32_t datasize)
|
|
|
|
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;
|
|
- reloc_base = image_address (buffer_aligned, datasize,
|
|
+ grub_dprintf ("chain", "reloc_dir: %p reloc_size: 0x%08x\n",
|
|
+ (void *)(unsigned long 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, datasize,
|
|
+ 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;
|
|
|
|
section = context.first_section;
|
|
for (i = 0; i < context.number_of_sections; i++, section++)
|
|
{
|
|
- size = section->virtual_size;
|
|
- if (size > section->raw_data_size)
|
|
- size = section->raw_data_size;
|
|
+ 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 + size - 1);
|
|
+ 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. */
|
|
@@ -587,21 +642,46 @@ handle_image (void *data, grub_efi_uint32_t datasize)
|
|
if (section->raw_data_size && section->virtual_size &&
|
|
base && end && reloc_base == base && reloc_base_end == end)
|
|
{
|
|
+ grub_dprintf ("chain", " section is relocation section\n");
|
|
reloc_section = section;
|
|
}
|
|
+ else
|
|
+ {
|
|
+ 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);
|
|
+ }
|
|
}
|
|
|
|
- if (section->characteristics && GRUB_PE32_SCN_MEM_DISCARDABLE)
|
|
- continue;
|
|
+ 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->virtual_address < context.size_of_headers ||
|
|
- section->raw_data_offset < context.size_of_headers)
|
|
+ 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);
|
|
@@ -609,13 +689,24 @@ handle_image (void *data, grub_efi_uint32_t datasize)
|
|
}
|
|
|
|
if (section->raw_data_size > 0)
|
|
- grub_memcpy (base, (grub_efi_uint8_t*)data + section->raw_data_offset,
|
|
- size);
|
|
+ {
|
|
+ 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 (size < section->virtual_size)
|
|
- grub_memset (base + size, 0, section->virtual_size - 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", "copied section %s\n", section->name);
|
|
+ grub_dprintf ("chain", " finished section %s\n", name);
|
|
}
|
|
|
|
/* 5 == EFI_IMAGE_DIRECTORY_ENTRY_BASERELOC */
|
|
@@ -638,12 +729,15 @@ handle_image (void *data, grub_efi_uint32_t datasize)
|
|
}
|
|
}
|
|
|
|
- entry_point = image_address (buffer_aligned, context.image_size,
|
|
- context.entry_point);
|
|
-
|
|
- if (!entry_point)
|
|
+ if (!found_entry_point)
|
|
{
|
|
- grub_error (GRUB_ERR_BAD_ARGUMENT, "invalid 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;
|
|
}
|
|
|
|
@@ -661,26 +755,24 @@ handle_image (void *data, grub_efi_uint32_t datasize)
|
|
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_printf ("file path: ");
|
|
- grub_efi_print_device_path (li->file_path);
|
|
- }
|
|
- else
|
|
+ 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);
|
|
|
|
diff --git a/include/grub/efi/pe32.h b/include/grub/efi/pe32.h
|
|
index 6e24dae2c..c03cc599f 100644
|
|
--- a/include/grub/efi/pe32.h
|
|
+++ b/include/grub/efi/pe32.h
|
|
@@ -229,12 +229,18 @@ 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
|
|
@@ -243,10 +249,28 @@ 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
|
|
--
|
|
2.14.3
|
|
|