[Bug 1907085] Re: Regression in backup-and-restore patch.

[Launchpad Bug Tracker]

This bug was fixed in the package grub2 - 2.04-1ubuntu37

---------------
grub2 (2.04-1ubuntu37) hirsute; urgency=medium

  * debian/patches/grub-install-backup-and-restore.patch: Fix-up the patch
    to correctly initialyze the names of the modules to restore. LP:
    #1907085
  * 10_linux: emit messages when initrdless boot is configured, attempted
    and fails triggering fallback. LP: #1901553
  * grub-common.service: port init.d script to systemd unit. Add warning
    message, when initrdless boot fails triggering fallback. LP: #1901553
  * debian/rules: undo po/ directory patching in
    override_dh_autoreconf_clean.
  * minilzo: built using the distribution's minilzo
  * ubuntu-fix-reproducible-squashfs-test.patch: fix squashfs-test with
    new squashfs-tools in hirsute.
  * rhboot-f34-make-exit-take-a-return-code.patch,
    rhboot-f34-dont-use-int-for-efi-status.patch: allow grub to exit
    non-zero under EFI, this should allow falling back to the next
    BootOrder BootEntry.
  * rhboot-f34-tcp-add-window-scaling-support.patch: speed up netboot
    transfer speed.
  * rhboot-f34-support-non-ethernet.patch,
    ubuntu-fixup-rhboot-f34-support-non-ethernet.patch,
    ubuntu-fixup-rhboot-f34-support-non-ethernet-2.patch:
    add support for link layer addresses of up to 32-bytes.
  * rhboot-f34-make-pmtimer-tsc-calibration-fast.patch:
    speed up calibration time, especially when booting VMs.

 -- Dimitri John Ledkov <xnox at ubuntu.com>  Sat, 12 Dec 2020 00:50:47
+0000

** Changed in: grub2 (Ubuntu Hirsute)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1907085

Title:
  Regression in backup-and-restore patch.

Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2 source package in Bionic:
  New
Status in grub2 source package in Focal:
  New
Status in grub2 source package in Groovy:
  New
Status in grub2 source package in Hirsute:
  Fix Released

Bug description:
  [Impact]

   * A regression was identified in the backup & restore patch on some
  architectures, which results in garbage filenames to be created in
  /boot/grub.

  The issue is reported on linux-ext4 mailing list https://marc.info/?l
  =linux-ext4&m=160709231522785&w=2

  [Test Case]

   * Execute grub-install --target pc-i386 on i386 machine against a
  nonexistent drive. Such that, backup & restore is triggered.

   * Observe that the restored modules names in /boot/grub do not have
  garbage file endings.

  [Where problems could occur]

   * The generated garbage file endings will remain on disk across
  future upgrade and will need to be cleaned up manually. I am pondering
  if I can clean them up somehow automatically. However the scope of the
  affected machines should be very small and limited to i386.

  [Other Info]
   
   * Reported on linux-ext4 mailing list & debugged by / patch provided by colin watson.

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