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

[Neil Wilson]

Similarly with online resizing:

$ cp tiny xxl
$ dd if=/dev/zero of=xxl bs=1 count=0 seek=1310720M
$ sudo losetup /dev/loop0 xxl
$ sudo e2fsck /dev/loop0
e2fsck 1.42 (29-Nov-2011)
/dev/loop0: clean, 11/65536 files, 12635/262144 blocks
$ sudo mount /dev/loop0 /mnt
$ sudo resize2fs /dev/loop0
resize2fs 1.42 (29-Nov-2011)
Filesystem at /dev/loop0 is mounted on /mnt; on-line resizing required
old_desc_blocks = 1, new_desc_blocks = 80
Performing an on-line resize of /dev/loop0 to 335544320 (4k) blocks.
resize2fs: Operation not permitted While trying to add group #8192

$ sudo umount /dev/loop0
$ sudo e2fsck /dev/loop0
e2fsck 1.42 (29-Nov-2011)
/dev/loop0: clean, 11/67108864 files, 4220121/268435456 blocks

With online resizing the filesystem fails to a consistent state at the
maximum filesystem size.

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https://bugs.launchpad.net/bugs/956038

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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