Make SBAT variable payload introspectable

Given a set of EFI variables and boot assets, it should be possible
to compute what the value of PCR 7 will be on the next boot.

As shim manages the contents of the SbatLevel variable and this is
measured to PCR 7, export the payloads that shim contains in a new
COFF section (.sbatlevel) so that it can be introspected by code
outside of shim.

The new section works a bit like .vendor_cert - it contains a header
and then the payload. In this case, the header contains no size fields
because the strings are NULL terminated. Shim uses this new section
internally in set_sbat_uefi_variable.

The .sbatlevel section starts with a 4 byte version field which is
not used by shim but may be useful for external auditors if the
format of the section contents change in the future.

Signed-off-by: Chris Coulson <chris.coulson@canonical.com>

0 files changed, 0 insertions, 0 deletions