[Bug 2045552] Re: nullboot 0.5.0: shim 15.7-0ubuntu1 update

[Chris Halse Rogers]

Feel free to ping me in #ubuntu-release with any answers :)

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https://bugs.launchpad.net/bugs/2045552

Title:
  nullboot 0.5.0: shim 15.7-0ubuntu1 update

Status in nullboot package in Ubuntu:
  Fix Released
Status in nullboot source package in Focal:
  New
Status in nullboot source package in Jammy:
  Incomplete

Bug description:
  [Impact]
  Security update for shim

  [Test plan]

  * Deploy Azure CVM and TPM FDE
  * Upgrade to this new package and reboot
  * Boot should be successful
  * Double check bios_measurements_log to ensure that the newly update shim was used for boot (https://github.com/canonical/tcglog-parser/tree/master/tcglog-dump can be used to extract checksum of the shim binary used at boot and compared to the one shipped in nullboot)

  * CPC - build new image with nullboot preinstalled, and attempt to
  register and boot such an images as first time.

  [Where problems could occur]

  Resealing could fail

  Shim could fail to boot

  Limited to Azure confidential VMs in scope

  Upgrade to and usage of interim lunar & mantic ubuntu releases is not
  supported on the Azure CVMs and does not work, hence this bug targets
  SRUs for LTS releases only.

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