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The IMAGE_DLLCHARACTERISTICS_NX_COMPAT flag marks an EFI binary where
the following conditions are met [1]:
* Executable and writable sections are separated.
* The application does not run self-modifying code.
* The application uses the EFI_MEMORY_ATTRIBUTE_PROTOCOL when loading
executable code.
* The application does not assume that all memory ranges are usable.
* The stack is not expected to be executable.
The only EFI binaries U-Boot provides that do not fulfill these
requirements are the EFI app and the EFI payload.
Once we have implemented separation of writable and executable memory in
U-Boot we can use the IMAGE_DLLCHARACTERISTICS_NX_COMPAT flag to decide
if we will load an EFI binary.
[1] New UEFI CA memory mitigation requirements for signing
https://techcommunity.microsoft.com/t5/hardware-dev-center/new-uefi-ca-memory-mitigation-requirements-for-signing/ba-p/3608714
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
73 lines
2.4 KiB
C
73 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Portable Executable and Common Object Constants
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*
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* Copyright (c) 2018 Heinrich Schuchardt
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*
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* based on the "Microsoft Portable Executable and Common Object File Format
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* Specification", revision 11, 2017-01-23
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*/
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#ifndef _ASM_PE_H
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#define _ASM_PE_H
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/* Characteristics */
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#define IMAGE_FILE_RELOCS_STRIPPED 0x0001
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#define IMAGE_FILE_EXECUTABLE_IMAGE 0x0002
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#define IMAGE_FILE_LINE_NUMS_STRIPPED 0x0004
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#define IMAGE_FILE_LOCAL_SYMS_STRIPPED 0x0008
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#define IMAGE_FILE_AGGRESSIVE_WS_TRIM 0x0010
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#define IMAGE_FILE_LARGE_ADDRESS_AWARE 0x0020
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/* Reserved 0x0040 */
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#define IMAGE_FILE_BYTES_REVERSED_LO 0x0080
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#define IMAGE_FILE_32BIT_MACHINE 0x0100
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#define IMAGE_FILE_DEBUG_STRIPPED 0x0200
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#define IMAGE_FILE_REMOVABLE_RUN_FROM_SWAP 0x0400
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#define IMAGE_FILE_NET_RUN_FROM_SWAP 0x0800
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#define IMAGE_FILE_SYSTEM 0x1000
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#define IMAGE_FILE_DLL 0x2000
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#define IMAGE_FILE_UP_SYSTEM_ONLY 0x4000
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#define IMAGE_FILE_BYTES_REVERSED_HI 0x8000
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/* Machine types */
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#define IMAGE_FILE_MACHINE_I386 0x014c
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#define IMAGE_FILE_MACHINE_ARM 0x01c0
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#define IMAGE_FILE_MACHINE_THUMB 0x01c2
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#define IMAGE_FILE_MACHINE_ARMNT 0x01c4
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#define IMAGE_FILE_MACHINE_AMD64 0x8664
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#define IMAGE_FILE_MACHINE_ARM64 0xaa64
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#define IMAGE_FILE_MACHINE_RISCV32 0x5032
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#define IMAGE_FILE_MACHINE_RISCV64 0x5064
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/* Header magic constants */
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#define IMAGE_NT_OPTIONAL_HDR32_MAGIC 0x010b
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#define IMAGE_NT_OPTIONAL_HDR64_MAGIC 0x020b
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#define IMAGE_DOS_SIGNATURE 0x5a4d /* MZ */
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#define IMAGE_NT_SIGNATURE 0x00004550 /* PE00 */
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/* Subsystem type */
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#define IMAGE_SUBSYSTEM_EFI_APPLICATION 10
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#define IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER 11
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#define IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER 12
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#define IMAGE_SUBSYSTEM_EFI_ROM 13
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/* DLL characteristics */
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#define IMAGE_DLLCHARACTERISTICS_NX_COMPAT 0x100
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/* Section flags */
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#define IMAGE_SCN_CNT_CODE 0x00000020
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#define IMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
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#define IMAGE_SCN_CNT_UNINITIALIZED_ DATA 0x00000080
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#define IMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
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#define IMAGE_SCN_MEM_DISCARDABLE 0x02000000
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#define IMAGE_SCN_MEM_NOT_CACHED 0x04000000
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#define IMAGE_SCN_MEM_NOT_PAGED 0x08000000
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#define IMAGE_SCN_MEM_SHARED 0x10000000
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#define IMAGE_SCN_MEM_EXECUTE 0x20000000
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#define IMAGE_SCN_MEM_READ 0x40000000
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#define IMAGE_SCN_MEM_WRITE 0x80000000
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#define LINUX_ARM64_MAGIC 0x644d5241
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#endif /* _ASM_PE_H */
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