[Bug 1811228] Re: Mdadm allows to change the name of the volume to empty and not trim whitespaces.

[Roman Sobanski]

This issue was already fixed in released mdadm-4.1.
https://git.kernel.org/pub/scm/utils/mdadm/mdadm.git/commit/?id=20e8fe52e7190b3ffda127566852eac2eb7fa1f7

Actually there is "mdadm - v4.1-rc1 - 2018-03-22" in Ubuntu 18.04.2.
Please update mdadm package to mdadm-4.1.


** Information type changed from Public to Private

** Package changed: debian-installer (Ubuntu) => mdadm (Ubuntu)

** Also affects: debian-installer (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1811228

Title:
  Mdadm allows to change the name of the volume to empty and not trim
  whitespaces.

Status in debian-installer package in Ubuntu:
  New
Status in mdadm package in Ubuntu:
  New

Bug description:
  Description:
  Mdadm allows to change the name of the volume to any, including empty, too short and too long.
  White spaces in the begin or end of the correct name are not trimmed properly.

  Steps to reproduce:
  1.	Create the volume:
  # mdadm --create /dev/md/imsm0 --metadata=imsm --raid-devices=2 /dev/nvme11n1 /dev/nvme12n1 --run
  # mdadm --create /dev/md/r0d2 --level=0 --chunk=128 --raid-devices=2 /dev/nvme11n1 /dev/nvme12n1 --run

  2.	Check if volume name is correct:
  # mdadm -D /dev/md/imsm0
  /dev/md/imsm0:
             Version : imsm
          Raid Level : container
       Total Devices : 2

     Working Devices : 2

  
                UUID : 6dce006b:086ce0fa:bdcf4f9e:d8bd68c4
       Member Arrays : /dev/md/r0d2

      Number   Major   Minor   RaidDevice

         -     259       13        -        /dev/nvme12n1
         -     259       12        -        /dev/nvme11n1
  root at gklab-94-128:~# mdadm -D /dev/md/r0d2
  /dev/md/r0d2:
           Container : /dev/md/imsm0, member 0
          Raid Level : raid0
          Array Size : 781412352 (745.21 GiB 800.17 GB)
        Raid Devices : 2
       Total Devices : 2

               State : clean
      Active Devices : 2
     Working Devices : 2
      Failed Devices : 0
       Spare Devices : 0

          Chunk Size : 128K

  Consistency Policy : none

  
                UUID : 9608dbcd:e4668ab4:015e7469:a263e5e0
      Number   Major   Minor   RaidDevice State
         0     259       12        0      active sync   /dev/nvme11n1
         1     259       13        1      active sync   /dev/nvme12n1

  3.	Stop the volume:
  # mdadm --stop /dev/md/r0d2

  4.	Try to change the name of the volume. New name should not be allowed by mdadm (ex. empty), or shuld start or end with whitespaces:
  # mdadm --update-subarray=0 --update=name -N "" /dev/md/imsm0

  5.	Assembly the volume:
  # mdadm --assemble --scan
  mdadm: Started /dev/md126 with 2 devices

  6.      Check the volume name.

  Expected result:
  Mdam should not allow to change name to incorrect. The volume with wrong name should not be assembled. If volume name is correct, eventual whitespaces should be trimmed.

  Current result:
  Mdadm allows to change the name of the volume to any and assemble the volume with wrong name.
  If name is correct and starts/ends with whitespace, it is not trimmed.

  # mdadm -D /dev/md/imsm0
  /dev/md/imsm0:
             Version : imsm
          Raid Level : container
       Total Devices : 2

     Working Devices : 2

  
                UUID : 6dce006b:086ce0fa:bdcf4f9e:d8bd68c4
       Member Arrays : /dev/md126

      Number   Major   Minor   RaidDevice

         -     259       13        -        /dev/nvme12n1
         -     259       12        -        /dev/nvme11n1

  # mdadm -E /dev/nvme12n1
  /dev/nvme12n1:
            Magic : Intel Raid ISM Cfg Sig.
          Version : 1.0.00
      Orig Family : 3292ee00
           Family : 3292ee00
       Generation : 00000003
       Attributes : All supported
             UUID : 6dce006b:086ce0fa:bdcf4f9e:d8bd68c4
         Checksum : 88845429 correct
      MPB Sectors : 1
            Disks : 2
     RAID Devices : 1

    Disk01 Serial : FT641000CH400BGN
            State : active
               Id : 00000000
      Usable Size : 97676545 (372.61 GiB 400.08 GB)

  []:
             UUID : f4d7bd6c:34479c57:2583d3f6:7247c93e
       RAID Level : 0
          Members : 2
            Slots : [UU]
      Failed disk : none
        This Slot : 1
      Sector Size : 4096
       Array Size : 195353088 (745.21 GiB 800.17 GB)
     Per Dev Size : 97676800 (372.61 GiB 400.08 GB)
    Sector Offset : 0
      Num Stripes : 3052392
       Chunk Size : 128 KiB
         Reserved : 0
    Migrate State : idle
        Map State : normal
      Dirty State : clean
       RWH Policy : off

    Disk00 Serial : FT62040052400GGN
            State : active
               Id : 00000000
      Usable Size : 97676545 (372.61 GiB 400.08 GB)

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