diff options
| author | Ard Biesheuvel <ardb@kernel.org> | 2023-04-18 16:49:51 +0300 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2023-04-20 16:45:12 +0300 |
| commit | 538bc0f40b364f2c7b81f11aa163f723b138b40f (patch) | |
| tree | bf1902edf9c52086c6b67f3e1d6f441a09300b98 /drivers/firmware/efi/libstub/zboot-header.S | |
| parent | bca2f3a9406b89961fbc6c92c52c6fc1fd91d35f (diff) | |
| download | linux-538bc0f40b364f2c7b81f11aa163f723b138b40f.tar.xz | |
efi/zboot: Set forward edge CFI compat header flag if supported
Add some plumbing to the zboot EFI header generation to set the newly
introduced DllCharacteristicsEx flag associated with forward edge CFI
enforcement instructions (BTI on arm64, IBT on x86)
x86 does not currently uses the zboot infrastructure, so let's wire it
up only for arm64.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Diffstat (limited to 'drivers/firmware/efi/libstub/zboot-header.S')
| -rw-r--r-- | drivers/firmware/efi/libstub/zboot-header.S | 49 |
1 files changed, 32 insertions, 17 deletions
diff --git a/drivers/firmware/efi/libstub/zboot-header.S b/drivers/firmware/efi/libstub/zboot-header.S index 053aba073594..fb676ded47fa 100644 --- a/drivers/firmware/efi/libstub/zboot-header.S +++ b/drivers/firmware/efi/libstub/zboot-header.S @@ -78,9 +78,36 @@ __efistub_efi_zboot_header: .quad 0 // ExceptionTable .quad 0 // CertificationTable .quad 0 // BaseRelocationTable -#ifdef CONFIG_DEBUG_EFI +#if defined(PE_DLL_CHAR_EX) || defined(CONFIG_DEBUG_EFI) .long .Lefi_debug_table - .Ldoshdr // DebugTable .long .Lefi_debug_table_size + + .section ".rodata", "a" + .p2align 2 +.Lefi_debug_table: + // EFI_IMAGE_DEBUG_DIRECTORY_ENTRY[] +#ifdef PE_DLL_CHAR_EX + .long 0 // Characteristics + .long 0 // TimeDateStamp + .short 0 // MajorVersion + .short 0 // MinorVersion + .long IMAGE_DEBUG_TYPE_EX_DLLCHARACTERISTICS // Type + .long 4 // SizeOfData + .long 0 // RVA + .long .Lefi_dll_characteristics_ex - .Ldoshdr // FileOffset +#endif +#ifdef CONFIG_DEBUG_EFI + .long 0 // Characteristics + .long 0 // TimeDateStamp + .short 0 // MajorVersion + .short 0 // MinorVersion + .long IMAGE_DEBUG_TYPE_CODEVIEW // Type + .long .Lefi_debug_entry_size // SizeOfData + .long 0 // RVA + .long .Lefi_debug_entry - .Ldoshdr // FileOffset +#endif + .set .Lefi_debug_table_size, . - .Lefi_debug_table + .previous #endif .Lsection_table: @@ -110,23 +137,11 @@ __efistub_efi_zboot_header: .set .Lsection_count, (. - .Lsection_table) / 40 +#ifdef PE_DLL_CHAR_EX +.Lefi_dll_characteristics_ex: + .long PE_DLL_CHAR_EX +#endif #ifdef CONFIG_DEBUG_EFI - .section ".rodata", "a" - .align 2 -.Lefi_debug_table: - // EFI_IMAGE_DEBUG_DIRECTORY_ENTRY - .long 0 // Characteristics - .long 0 // TimeDateStamp - .short 0 // MajorVersion - .short 0 // MinorVersion - .long IMAGE_DEBUG_TYPE_CODEVIEW // Type - .long .Lefi_debug_entry_size // SizeOfData - .long 0 // RVA - .long .Lefi_debug_entry - .Ldoshdr // FileOffset - - .set .Lefi_debug_table_size, . - .Lefi_debug_table - .previous - .Lefi_debug_entry: // EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY .ascii "NB10" // Signature |