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[Jürg Häfliger <1798013@xxxxxxxxxxxxxxxxxx>]

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1798013

Title:
  xattr length returned by vfs_getxattr() is not correct in Trusty
  kernel

Status in ubuntu-kernel-tests:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Trusty:
  Fix Released

Bug description:
  == Justification ==
  This issue has been addressed in bug 1789746 for other kernels

  When the getxattr05 test in ubuntu_ltp_syscalls test suite, the test
  will failed with:

  tag=getxattr05 stime=1539663573
  cmdline="getxattr05"
  contacts=""
  analysis=exit
  <<<test_output>>>
  incrementing stop
  tst_test.c:1072: INFO: Timeout per run is 0h 05m 00s
  getxattr05.c:85: PASS: Got same data when acquiring the value of system.posix_acl_access twice
  getxattr05.c:80: FAIL: Got different data(00 != ffffffff) at 16
  getxattr05.c:85: PASS: Got same data when acquiring the value of system.posix_acl_access twice

  Summary:
  passed   2
  failed   1
  skipped  0
  warnings 0

  This is caused by posix_acl_fix_xattr_to_user() being passed the total
  buffer size and not the actual size of the xattr as returned by
  vfs_getxattr().

  == Fix ==
  82c9a927bc5d ("getxattr: use correct xattr length")

  A test kernel for Trusty could be found here:
  http://people.canonical.com/~phlin/kernel/lp-1798013-getxattr05/

  == Regression Potential ==
  Low, this one-liner fix just passes the actual length of the xattr as returned by vfs_getxattr() down.

  == Test Case ==
  Run the getxattr05 test in ubuntu_ltp_syscalls test suite. And it will pass with the patched kernel.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-160-generic 3.13.0-160.210
  ProcVersionSignature: User Name 3.13.0-160.210-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-160-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Oct 16 03:39 seq
   crw-rw---- 1 root audio 116, 33 Oct 16 03:39 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.1-0ubuntu3.29
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Date: Tue Oct 16 04:19:43 2018
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  MachineType: Intel Corporation S1200RP
  PciMultimedia:

  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-160-generic root=UUID=b0d2ae4e-12dd-423e-acea-272ee8b2a893 ro console=ttyS0,115200n8
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-160-generic N/A
   linux-backports-modules-3.13.0-160-generic  N/A
   linux-firmware                              1.127.24
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/01/2015
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: S1200RP.86B.03.02.0003.070120151022
  dmi.board.asset.tag: ....................
  dmi.board.name: S1200RP
  dmi.board.vendor: Intel Corporation
  dmi.board.version: G62254-407
  dmi.chassis.asset.tag: ....................
  dmi.chassis.type: 17
  dmi.chassis.vendor: ..............................
  dmi.chassis.version: ..................
  dmi.modalias: dmi:bvnIntelCorp.:bvrS1200RP.86B.03.02.0003.070120151022:bd07/01/2015:svnIntelCorporation:pnS1200RP:pvr....................:rvnIntelCorporation:rnS1200RP:rvrG62254-407:cvn..............................:ct17:cvr..................:
  dmi.product.name: S1200RP
  dmi.product.version: ....................
  dmi.sys.vendor: Intel Corporation

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