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[Phillip Susi <psusi@xxxxxxxxxx>]

** Changed in: util-linux (Ubuntu Trusty)
       Status: New => In Progress

** Changed in: util-linux (Ubuntu Trusty)
   Importance: Undecided => High

** Changed in: util-linux (Ubuntu Trusty)
     Assignee: (unassigned) => Phillip Susi (psusi)

** No longer affects: util-linux (Ubuntu)

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https://bugs.launchpad.net/bugs/1389321

Title:
  SRU: partx wraps partition offset and length mod 2^32 (2^23 sectors)

Status in “util-linux” source package in Trusty:
  In Progress

Bug description:
  [Impact]

  Partx is used to activate partitions on loopback devices.  It is had a
  bug causing it to overflow and wraparound at the 4 GB mark, causing it
  to put the partitions in the wrong place giving access to the wrong
  areas of the disk, which at best, renders the activated partitions
  unusable, and at worst, may cause corrupt data to be written to disk.

  [Test Case]

  truncate -s 6g img
  sudo losetup /dev/loop0 img
  sudo parted -s /dev/loop0 mklabel msdos mkpart primary ext2 5g 6g
  cat /sys/block/loop0/loop0p1/start

  The value should be 9764864, which corresponds to 4999610368 bytes.
  Instead the bug causes it to be 1376256, or 704643072 bytes.

  [Regression Potential]

  None.  The fix was simply to change the data type of the argument to
  partx_add_partition from 32 bit ( unsigned long ) to 64 bit ( unsigned
  long long ), which upstream did long ago.

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