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[Launchpad Bug Tracker <1934506@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package shim - 15.4-0ubuntu7

---------------
shim (15.4-0ubuntu7) hirsute; urgency=medium

  * Fix load option parsing, and thus fwupd execution (LP: #1929471) (PR #379)
  * Fix occasional crashes in _relocate() on arm64 (LP: #1928010) (PR #383)
  * Fix accidental deletion of RT variables (LP: #1934506) (PR #387)
  * mok: relax the maximum variable size check (LP: #1934780) (PR #369)

 -- Julian Andres Klode <juliank@xxxxxxxxxx>  Wed, 07 Jul 2021 10:57:35
+0200

** Changed in: shim (Ubuntu Hirsute)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1934506

Title:
  Mirrored MOK variables could be accidentally deleted

Status in shim:
  New
Status in shim package in Ubuntu:
  Fix Released
Status in shim-signed package in Ubuntu:
  Fix Released
Status in shim source package in Xenial:
  Fix Committed
Status in shim-signed source package in Xenial:
  Fix Committed
Status in shim source package in Bionic:
  Fix Committed
Status in shim-signed source package in Bionic:
  Fix Committed
Status in shim source package in Focal:
  Fix Committed
Status in shim-signed source package in Focal:
  Fix Committed
Status in shim source package in Hirsute:
  Fix Released

Bug description:
  [Impact]
  On some systems, Mok variables mirrored are accidentally deleted after the mirroring. This can prevent the kernel from loading DKMS modules, if it does not yet use the config table to parse the MokList variable; and userspace tools relying on the variables will have wrong results.

  Most implementations reject the accidental delete, as the flags do not
  match, this bug was produced on VMWare.

  [Test plan]
  If we can get a VMWare Workstation or Player license, it would be good to validate that. Without a license, the best we can do is ensure there are no regressions on other machines and rely on the authors of the patch (SUSE) to have tested this properly.

  [Where problems could occur]
  We could accidentally delete the variable on other systems now.

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