[PATCH v6 0/8] FMP versioning support

Masahisa Kojima masahisa.kojima at linaro.org
Fri May 19 12:32:06 CEST 2023

Firmware version management is not implemented in the current
FMP implementation. This series aims to add the versioning support
in FMP.

Currently, there is no way to know the current running firmware
version through the EFI interface. FMP->GetImageInfo() returns
always 0 for the version number. So a user can not know that
expected firmware is running after the capsule update.

EDK II reference implementation utilizes the FMP Payload Header
inserted right before the capsule payload.
U-Boot also follows the EDK II implementation.
With this series applied, version number can be specified
in the capsule file generation with mkeficapsule tool, then
user can know the running firmware version through
FMP->GetImageInfo() and ESRT.

There is a design consideration for lowest supported version.
If the backing storage is a file we can't trust
any of that information since anyone can tamper with the file,
although the variables are defined as RO.
With that, we store the lowest supported version in the device tree.
We can trust the information from dtb as long as the former
stage boot loader verifies the image containing the dtb.
The firmware version can not be stored in device tree because
not all the capsule files do not have a device tree.

Note that this series does not mandate the FMP Payload Header,
compatible with boards that are already using the existing
U-Boot FMP implementation.
If no FMP Payload Header is found in the capsule file, fw_version,
lowest supported version, last attempt version and last attempt
status is set to 0 and this is the same behavior as existing FMP

Major Changes in v6:
- change the location of fw_version and lowest supported version
  - fw_version is stored in FMP Payload Header in the capsule file
  - lowest_supported_version is stored in the device tree

Major Changes in v5:
- major design changes, versioning is implemented with
  device tree instead of EFI variable

Major Changes in v4:
- add python-based test

Major Changes in v3:

Masahisa Kojima (8):
  efi_loader: add the number of image entries in efi_capsule_update_info
  efi_loader: store firmware version into FmpState variable
  efi_loader: versioning support in GetImageInfo
  efi_loader: get lowest supported version from device tree
  efi_loader: check lowest supported version
  mkeficapsule: add FMP Payload Header
  doc: uefi: add firmware versioning documentation
  doc: uefi: add anti-rollback documentation

 arch/arm/mach-rockchip/board.c                |   4 +-
 .../imx8mp_rsb3720a1/imx8mp_rsb3720a1.c       |   2 +-
 .../imx8mm-cl-iot-gate/imx8mm-cl-iot-gate.c   |   2 +-
 board/emulation/qemu-arm/qemu-arm.c           |   2 +-
 board/kontron/pitx_imx8m/pitx_imx8m.c         |   2 +-
 board/kontron/sl-mx8mm/sl-mx8mm.c             |   2 +-
 board/kontron/sl28/sl28.c                     |   2 +-
 board/rockchip/evb_rk3399/evb-rk3399.c        |   2 +-
 board/sandbox/sandbox.c                       |   2 +-
 board/socionext/developerbox/developerbox.c   |   2 +-
 board/st/stm32mp1/stm32mp1.c                  |   2 +-
 board/xilinx/common/board.c                   |   2 +-
 doc/develop/uefi/uefi.rst                     |  61 ++++
 .../firmware/firmware-version.txt             |  22 ++
 doc/mkeficapsule.1                            |  10 +
 include/efi_loader.h                          |   3 +-
 lib/efi_loader/efi_firmware.c                 | 273 ++++++++++++++++--
 lib/fwu_updates/fwu.c                         |   2 +-
 tools/eficapsule.h                            |  30 ++
 tools/mkeficapsule.c                          |  37 ++-
 20 files changed, 421 insertions(+), 43 deletions(-)
 create mode 100644 doc/device-tree-bindings/firmware/firmware-version.txt


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