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efi_loader: Check machine type in the image header

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Check FileHeader.Machine to make sure the EFI executable image is built
for the same architecture. For example, 32-bit U-Boot on x86 will print
an error message instead of loading an x86_64 image and crashing.

Signed-off-by: Ivan Gorinov <ivan.gorinov@intel.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Ivan Gorinov 2018-04-05 18:32:06 -07:00 committed by Alexander Graf
parent 0c5d2a3dac
commit 61a5ced6ad
2 changed files with 43 additions and 12 deletions
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4
include/pe.h
View file

@ -38,11 +38,15 @@ typedef struct _IMAGE_DOS_HEADER {
#define IMAGE_DOS_SIGNATURE 0x5A4D /* MZ */
#define IMAGE_NT_SIGNATURE 0x00004550 /* PE00 */
#define IMAGE_FILE_MACHINE_I386 0x014c
#define IMAGE_FILE_MACHINE_ARM 0x01c0
#define IMAGE_FILE_MACHINE_THUMB 0x01c2
#define IMAGE_FILE_MACHINE_ARMNT 0x01c4
#define IMAGE_FILE_MACHINE_AMD64 0x8664
#define IMAGE_FILE_MACHINE_ARM64 0xaa64
#define IMAGE_FILE_MACHINE_RISCV32 0x5032
#define IMAGE_FILE_MACHINE_RISCV64 0x5064
#define IMAGE_NT_OPTIONAL_HDR32_MAGIC 0x10b
#define IMAGE_NT_OPTIONAL_HDR64_MAGIC 0x20b
#define IMAGE_SUBSYSTEM_EFI_APPLICATION 10

51
lib/efi_loader/efi_image_loader.c
View file

@ -22,6 +22,30 @@ const efi_guid_t efi_simple_file_system_protocol_guid =
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID;
const efi_guid_t efi_file_info_guid = EFI_FILE_INFO_GUID;
static int machines[] = {
#if defined(CONFIG_ARM64)
IMAGE_FILE_MACHINE_ARM64,
#elif defined(CONFIG_ARM)
IMAGE_FILE_MACHINE_ARM,
IMAGE_FILE_MACHINE_THUMB,
IMAGE_FILE_MACHINE_ARMNT,
#endif
#if defined(CONFIG_X86_64)
IMAGE_FILE_MACHINE_AMD64,
#elif defined(CONFIG_X86)
IMAGE_FILE_MACHINE_I386,
#endif
#if defined(CONFIG_CPU_RISCV_32)
IMAGE_FILE_MACHINE_RISCV32,
#endif
#if defined(CONFIG_CPU_RISCV_64)
IMAGE_FILE_MACHINE_RISCV64,
#endif
0 };
/*
* Print information about a loaded image.
*
@ -172,14 +196,7 @@ void *efi_load_pe(void *efi, struct efi_loaded_image *loaded_image_info)
void *entry;
uint64_t image_size;
unsigned long virt_size = 0;
bool can_run_nt64 = true;
bool can_run_nt32 = true;
#if defined(CONFIG_ARM64)
can_run_nt32 = false;
#elif defined(CONFIG_ARM)
can_run_nt64 = false;
#endif
int supported = 0;
dos = efi;
if (dos->e_magic != IMAGE_DOS_SIGNATURE) {
@ -193,6 +210,18 @@ void *efi_load_pe(void *efi, struct efi_loaded_image *loaded_image_info)
return NULL;
}
for (i = 0; machines[i]; i++)
if (machines[i] == nt->FileHeader.Machine) {
supported = 1;
break;
}
if (!supported) {
printf("%s: Machine type 0x%04x is not supported\n",
__func__, nt->FileHeader.Machine);
return NULL;
}
/* Calculate upper virtual address boundary */
num_sections = nt->FileHeader.NumberOfSections;
sections = (void *)&nt->OptionalHeader +
@ -205,8 +234,7 @@ void *efi_load_pe(void *efi, struct efi_loaded_image *loaded_image_info)
}
/* Read 32/64bit specific header bits */
if (can_run_nt64 &&
(nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC)) {
if (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC) {
IMAGE_NT_HEADERS64 *nt64 = (void *)nt;
IMAGE_OPTIONAL_HEADER64 *opt = &nt64->OptionalHeader;
image_size = opt->SizeOfImage;
@ -222,8 +250,7 @@ void *efi_load_pe(void *efi, struct efi_loaded_image *loaded_image_info)
rel_size = opt->DataDirectory[rel_idx].Size;
rel = efi_reloc + opt->DataDirectory[rel_idx].VirtualAddress;
virt_size = ALIGN(virt_size, opt->SectionAlignment);
} else if (can_run_nt32 &&
(nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR32_MAGIC)) {
} else if (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
IMAGE_OPTIONAL_HEADER32 *opt = &nt->OptionalHeader;
image_size = opt->SizeOfImage;
efi_set_code_and_data_type(loaded_image_info, opt->Subsystem);