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lib/efi_loader: fix ABI in efi_mm_communicate_header

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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: 23a397d2e2 ("efi_loader: Add headers for EDK2 StandAloneMM communication")
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
This commit is contained in:
Etienne Carriere 2020-11-21 11:59:33 +01:00 committed by Heinrich Schuchardt
parent 31cadc3635
commit 03699bc756
1 changed files with 1 additions and 1 deletions
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2
include/mm_communication.h
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@ -43,7 +43,7 @@
* To avoid confusion in interpreting frames, the communication buffer should * To avoid confusion in interpreting frames, the communication buffer should
* always begin with efi_mm_communicate_header. * always begin with efi_mm_communicate_header.
*/ */
struct efi_mm_communicate_header { struct __packed efi_mm_communicate_header {
efi_guid_t header_guid; efi_guid_t header_guid;
size_t message_len; size_t message_len;
u8 data[]; u8 data[];