[Bug 2039172] Re: grub 2.12~rc1 fails to load files from large directories on XFS

[Bug Watch Updater]

** Changed in: grub2 (Debian)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/2039172

Title:
  grub 2.12~rc1 fails to load files from large directories on XFS

Status in grub2 package in Ubuntu:
  Triaged
Status in ubuntu-release-upgrader package in Ubuntu:
  Triaged
Status in grub2 source package in Mantic:
  New
Status in ubuntu-release-upgrader source package in Mantic:
  Fix Committed
Status in grub2 source package in Noble:
  Triaged
Status in ubuntu-release-upgrader source package in Noble:
  Triaged
Status in grub2 package in Debian:
  Fix Released

Bug description:
  [Impact]
  Multi-extent directories are not parsed correctly by grub's XFS code in 2.12~rc1, preventing it from loading files from directories with too many entries, such as the grub module directory.

  This should only affect BIOS systems as they need to load the core
  grub modules from the module directory, whereas UEFI systems have them
  embedded in the ESP EFI image.

  [Test plan]

  On systems BIOS systems with XFS /boot, or XFS / and no separate boot
  partition, the upgrade should be prevented early on with a message
  linking to this bug report.

  We should also test upgrades on "normal"/unaffected system to make
  sure it is not unnecessarily prevented.

  [Where problems could occur]
  The two risks here are (1) missing a case where we should block upgrade, and (2) preventing an upgrade in a case where we should not. The unit tests included in the patch attempt to mitigate this risk.

  Any issues would probably come from logic errors in the code that
  parses /proc/mounts.

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