[Bug 1582728] Re: DASDFMT fails with a buffer overflow error

[Andy Hartman]

Contents of /proc/dasd/devices:

/proc/dasd # cat devices
0.0.0100(FBA ) at ( 94:     0) is dasda       : active at blocksize: 512, 774144 blocks, 378 MB
0.0.0101(FBA ) at ( 94:     4) is dasdb       : active at blocksize: 512, 774144 blocks, 378 MB
0.0.0200(ECKD) at ( 94:     8) is dasdc       : unformatted

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https://bugs.launchpad.net/bugs/1582728

Title:
  DASDFMT fails with a buffer overflow error

Status in Ubuntu on IBM z Systems:
  In Progress
Status in s390-tools package in Ubuntu:
  Triaged
Status in s390-tools source package in Xenial:
  Triaged

Bug description:
  [Impact]

   * In certain hardware configurations, dasdfmt fails to format a
  drive, thus preventing successful installation and/or initialisation
  of a new disk.

  "there is a bug in the parsing of /proc/dasd/devices which is being
  triggered only if an FBA device is listed prior to the ECKD device in
  question. And since you've had FBA devices attached to your system
  during the installation, you ran into that bug."

  [Test Case]

   * On a system with FBA and ECKD devices, perform dasdfmt

  [Regression Potential]

   * Minimal. Bug fix cherrypick from upstream.

  [Original Description]
   
  During installation, either through the menu or in an ssh session , dasdfmt fails with a buffer overflow error and does not format the dasd volume. The volume is a z/VM minidisk - defined as 1 to end, this is common in this environment. The DASD volume was formatted from z/VM as a minidisk volume. These are the same steps taken for other distributions running under z/VM. I've attached some screen shots.

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