Pack struct efi_mm_communicate_header as done in EDK2 as seen in release 201808 [1]. If not packed sizeof() for the structure adds 4 additional bytes on 32bit targets which breaks the ABI.
Link: [1] https://github.com/tianocore/edk2/blob/edk2-stable201808/MdePkg/Include/Protocol/MmCommunication.h#L21 Fixes: 23a397d2e2fb ("efi_loader: Add headers for EDK2 StandAloneMM communication") Signed-off-by: Etienne Carriere <etienne.carri...@linaro.org> --- include/mm_communication.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/mm_communication.h b/include/mm_communication.h index e464cbb48e..e65fbde60d 100644 --- a/include/mm_communication.h +++ b/include/mm_communication.h @@ -43,7 +43,7 @@ * To avoid confusion in interpreting frames, the communication buffer should * always begin with efi_mm_communicate_header. */ -struct efi_mm_communicate_header { +struct __packed efi_mm_communicate_header { efi_guid_t header_guid; size_t message_len; u8 data[]; -- 2.17.1
