[Bug 2009078] Re: rebuild debian-installer against current boot stack (SecureBoot security updates / revocations)

[Steve Langasek]

Hello Steve, or anyone else affected,

Accepted debian-installer into focal-proposed. The package will build
now and be available at https://launchpad.net/ubuntu/+source/debian-
installer/20101020ubuntu614.6 in a few hours, and then in the -proposed
repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: debian-installer (Ubuntu Focal)
       Status: In Progress => Fix Committed

** Tags removed: verification-failed-focal
** Tags added: verification-needed verification-needed-focal

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https://bugs.launchpad.net/bugs/2009078

Title:
  rebuild debian-installer against current boot stack (SecureBoot
  security updates / revocations)

Status in debian-installer package in Ubuntu:
  Invalid
Status in debian-installer source package in Focal:
  Fix Committed

Bug description:
  [Justification]
  There is another round of security updates for secureboot that result in SBAT revocations of all the previous shims/grubs.  Since the 20.04.5 point release inadvertently went out without a current UEFI bootloader and was thus already revoked before release, we have agreed to do an exceptional 20.04.6 point release.  That should include the current version of shim and grub2.

  [Test case]
  * Build a daily PROPOSED=1 focal image that pulls in the new d-i boot bits.
  * On a system with SecureBoot enabled, boot the 22.04.2 install media.  This will cause SBAT to be updated and the system to refuse to boot older shims.
  * To download the current UEFI revocation list for amd64 and apply it to dbx, run:
    * mkdir -p updates/dbx
    * wget -O updates/dbx/DBXUpdate.bin https://uefi.org/sites/default/files/resources/DBXUpdate.bin
    * sudo sbkeysync --no-default-keystores --keystore ./updates --verbose
  * Try to boot Ubuntu 20.04.5 media.  Confirm that the boot is blocked with a security error.
  * Boot the 20.04 daily media.  Confirm that the image boots.

  [Where problems could occur]
  We are pulling grub2-signed and shim2-signed from focal-proposed.  If something happens that prevents these from being released, then we would need to respin.  Otherwise, this change should only increase the set of machines on which it's possible for us to boot the point release media.

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