------- Comment From [email protected] 2022-11-10 08:55 EDT-------
(In reply to comment #6)
> So commit aa127a069ef312aca02b730d5137e1778d0c3ba7 "s390/boot: add secure
> boot trailer" was just upstream accepted with v6.1-rc3.
> And it got tagged for upstream stable with:
> "Cc: <[email protected]> # 5.2+"
> That means that it will ideally automatically land over time in all Ubuntu
> kernels, down to focal's 5.4.

Unfortunately the automated stable backport to v5.4, v5.10, and v5.14
failed because the source file that is modified by this patch was moved
around:

https://lore.kernel.org/stable/[email protected]/

> But since this bug is marked as critical, the patch is relatively short,
> traceable and s390x-specific, I'll go ahead and submit this patch for Jammy
> and Focal ahead of upstream stable.

In addition to the work you plan, I could provide an adjusted stable
backport for the upstream targets for which automatic backport failed.
Would this help get this patch into any more Ubuntu versions?

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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1996071

Title:
  [UBUNTU 20.04] boot: Add secure boot trailer

Status in Ubuntu on IBM z Systems:
  New
Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Focal:
  New
Status in linux source package in Jammy:
  New
Status in linux source package in Kinetic:
  New

Bug description:
  Description:   boot: Add secure boot trailer
  Symptom:       Secure boot of Linux will no longer be possible with an 
upcoming
                 IBM Z firmware update.

  Problem:       New IBM Z firmware requires signed bootable images to contain a
                 trailing data block with a specific format.

  Solution:      Add the trailing data block to the Linux kernel image.

  Reproduction:  Apply latest firmware, perform IPL with Secure Boot
  enabled.

  Fix:           available upstream with
  Upstream-ID:   aa127a069ef312aca02b730d5137e1778d0c3ba7

  Preventive:    yes

  Date:          2022-10-27
  Author:        Peter Oberparleiter <[email protected]>
  Component:     kernel

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