[Bug 2064319] Comment bridged from LTC Bugzilla

[bugproxy]

------- Comment From naynjain at ibm.com 2025-08-01 16:49 EDT-------
Thanks Mate for the update.

So, is the new signed grub image with new signature (having padding in
the middle) is available now for testing?

If so, could you please share the new signed image to proceed with
testing?

Thanks & Regards,
- Nayna

------- Comment From naynjain at ibm.com 2025-08-01 16:52 EDT-------
Also, wanted to add that you might be aware that Sudhakar is actively working on review with Daniel Kiper for grub patches.

And there have been lot of changes as part of review feedback, so would
be good to keep up with the latest patches in the next signed image.

Thanks & Regards,
- Nayna

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Foundations Bugs, which is subscribed to grub2 in Ubuntu.
https://bugs.launchpad.net/bugs/2064319

Title:
  Power guest secure boot with key management: GRUB2 portion

Status in The Ubuntu-power-systems project:
  New
Status in grub2 package in Ubuntu:
  New

Bug description:
  Covering the GRUB2 portion:

  Feature:

  This feature comprises PowerVM LPAR guest OS kernel verification using
  static keys to extend the chain of trust from partition firmware to
  the OS kernel.  GRUB and the host OS kernel are signed with 2 separate
  public key pairs.  Partition firmware includes the the public
  verification key for GRUB in its build and uses it to verify GRUB.
  GRUB includes the public verification key for the OS kernel in its
  build and uses it to verify the OS kernel image

  Test case:

  If secure boot is switched off, any GRUB and kernel boots.
  If secure boot is switched on:
    - Properly signed GRUB boots.
    - Improperly signed GRUB does not boot.
    - Tampered signed GRUB does not boot.
    - Properly signed kernels boot.
    - Improperly signed kernels do not boot.
    - Tampered signed kernels do not boot.
  TPM PCRs are extended roughly following the TCG PC Client and UEFI specs as they apply to POWER.

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