[Bug 956038] Re: resize2fs allows resize beyond maximum fs size - corrupts fs

[Neil Wilson]

The use case here is expansion of the root partition of a virtual
machines from a small core image.

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Title:
  resize2fs allows resize beyond maximum fs size - corrupts fs

Status in “e2fsprogs” package in Ubuntu:
  New

Bug description:
  If you resize a 1G partition to more than 1T the filesystem becomes
  corrupted offline and errors on-line.

  resize2fs does not check the maximum size of the filesystem before
  initiating the resize.

  To reproduce:

  $ dd if=/dev/zero of=tiny bs=1 count=0 seek=1G
  $ mkfs.ext4 -F -J size=128 tiny

  ....
  Maximum filesystem blocks=268435456
  ....
  $ cp tiny xxl
  $ resize2fs xxl 1310720M

  resize2fs 1.42 (29-Nov-2011)
  Resizing the filesystem on xxl to 335544320 (4k) blocks.
  The filesystem on xxl is now 335544320 blocks long.

  $ e2fsck xxl
  e2fsck 1.42 (29-Nov-2011)
  e2fsck: Group descriptors look bad... trying backup blocks...
  One or more block group descriptor checksums are invalid.  Fix<y>?

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: e2fsprogs 1.41.14-1ubuntu3
  ProcVersionSignature: Ubuntu 3.0.0-16.29-generic 3.0.20
  Uname: Linux 3.0.0-16-generic x86_64
  ApportVersion: 1.23-0ubuntu4
  Architecture: amd64
  CheckboxSubmission: 55cafa5b8b82ed224cc59d444cb1fc25
  CheckboxSystem: 3e53d3ea5811723345f19eff5070f9ab
  Date: Thu Mar 15 13:51:37 2012
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  SourcePackage: e2fsprogs
  UpgradeStatus: No upgrade log present (probably fresh install)

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