diff options
| author | Heinrich Schuchardt | 2024-02-14 21:43:21 +0100 |
|---|---|---|
| committer | Heinrich Schuchardt | 2024-02-28 14:37:46 +0100 |
| commit | c9f368b597a02f9919cb0c1c03e6b231129e9262 (patch) | |
| tree | decb64beeaa7b3ffe7e2bb399d916f5bfa4e3767 /include/asm-generic | |
| parent | d49fa3defa50c6d3f04acbb52fd486c13c14ab6a (diff) | |
efi_loader: set IMAGE_DLLCHARACTERISTICS_NX_COMPAT
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>
Diffstat (limited to 'include/asm-generic')
| -rw-r--r-- | include/asm-generic/pe.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/asm-generic/pe.h b/include/asm-generic/pe.h index b9d674b6da4..cd5b6ad62bf 100644 --- a/include/asm-generic/pe.h +++ b/include/asm-generic/pe.h @@ -51,6 +51,9 @@ #define IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER 12 #define IMAGE_SUBSYSTEM_EFI_ROM 13 +/* DLL characteristics */ +#define IMAGE_DLLCHARACTERISTICS_NX_COMPAT 0x100 + /* Section flags */ #define IMAGE_SCN_CNT_CODE 0x00000020 #define IMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040 |