[Bug 1865515] Re: Chainbooting from grub over the network to local shim breaks chain of trust

[Lee Trager]

By default an LXD VM boots from the disk first. However you can change
the boot order by adding "boot.priority" to your devices. The device
with the highest number boots first.

LXD devices config for booting off the boot disk.
devices:
  eth0:
    name: eth0
    nictype: bridged
    parent: br0
    type: nic
  root:
    path: /
    pool: default
    size: "8000000000"
    type: disk

LXD devices config for booting off the network first.
devices:
  eth0:
    boot.priority: "1"
    name: eth0
    nictype: bridged
    parent: br0
    type: nic
  root:
    boot.priority: "0"
    path: /
    pool: default
    size: "8000000000"
    type: disk

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https://bugs.launchpad.net/bugs/1865515

Title:
  Chainbooting from grub over the network to local shim breaks chain of
  trust

Status in MAAS:
  Confirmed
Status in grub2 package in Ubuntu:
  Triaged
Status in shim-signed package in Ubuntu:
  Triaged

Bug description:
  MAAS (2.4.2 and 2.6.2) cannot deploy to a server with Secure Boot
  active. This appears to be a regression of bug #1711203; the symptoms
  are identical. Namely:

  1) The system can begin deployment fine.
  2) After deployment is complete except for the final reboot, the
     system will reboot.
  3) GRUB appears briefly on the screen.
  4) The system console briefly displays the message:
     Bootloader has not verified loaded image
     System is compromised.  halting.
  5) The node powers off.
  6) Eventually MAAS times out on the deployment and declares
     that it's failed.

  I've verified this on three MAAS servers and one node each (jehan, a
  Quanta QuantaGrid D52B-1U in 18T; capella, a Supermicro SYS-6028U-TR4+
  in 1SS, and brennan, an Intel NUC DC53427HYE on my home network).

  Two of the MAAS servers are running MAAS
  2.6.2-7841-ga10625be3-0ubuntu1~18.04.1; the third is on
  2.4.2-7034-g2f5deb8b8-0ubuntu1.

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