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[Christian Boltz <1628745@xxxxxxxxxxxxxxxxxx>]

** Changed in: apparmor
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1628745

Title:
  Change in kernel exec transition behavior causes regression tests to
  fail

Status in AppArmor:
  Fix Released
Status in apparmor package in Ubuntu:
  Fix Released
Status in apparmor source package in Xenial:
  Fix Released

Bug description:
  [Impact]

   * The exec_stack.sh regression test fails due to a behavior change in
  4.8 kernels from this patch:

     commit 9f834ec18defc369d73ccf9e87a2790bfa05bf46
     Author: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
     Date:   Mon Aug 22 16:41:46 2016 -0700

         binfmt_elf: switch to new creds when switching to new mm

   * Adjusting the regression tests appropriately allows the kernel and
  security teams to use QRT's test-apparmor.py to test kernel and
  userspace AppArmor changes with confidence

  [Test Case]

  $ apt-get source apparmor # make sure this fetches the new apparmor source
  $ sudo apt-get install libapparmor-dev
  $ cd tests/regression/apparmor
  $ make USE_SYSTEM=1
  $ sudo bash exec_stack.sh
  running exec_stack
  /tmp/testlibRpZj1Y/source/yakkety/apparmor-2.10.95/tests/regression/apparmor/prologue.inc: line 219:   608 Segmentation fault      $testexec "$@" > $outfile 2>&1
  Error: transition failed. Test 'EXEC_STACK (2 stacked - file)' was expected to 'fail'. Reason for failure expect errno 13 != 139
  /tmp/testlibRpZj1Y/source/yakkety/apparmor-2.10.95/tests/regression/apparmor/prologue.inc: line 219:   610 Segmentation fault      $testexec "$@" > $outfile 2>&1
  Error: transition failed. Test 'EXEC_STACK (2 stacked - otherfile)' was expected to 'fail'. Reason for failure expect errno 13 != 139
  /tmp/testlibRpZj1Y/source/yakkety/apparmor-2.10.95/tests/regression/apparmor/prologue.inc: line 219:   612 Segmentation fault      $testexec "$@" > $outfile 2>&1
  Error: transition failed. Test 'EXEC_STACK (2 stacked - thirdfile)' was expected to 'fail'. Reason for failure expect errno 13 != 139
  /tmp/testlibRpZj1Y/source/yakkety/apparmor-2.10.95/tests/regression/apparmor/prologue.inc: line 219:   613 Segmentation fault      $testexec "$@" > $outfile 2>&1
  Error: transition failed. Test 'EXEC_STACK (2 stacked - sharedfile)' was expected to 'pass'. Reason for failure 'killed by signal 11'
  /tmp/testlibRpZj1Y/source/yakkety/apparmor-2.10.95/tests/regression/apparmor/prologue.inc: line 219:   620 Segmentation fault      $testexec "$@" > $outfile 2>&1
  Error: transition failed. Test 'EXEC_STACK (2 stacked - okcon)' was expected to 'pass'. Reason for failure 'killed by signal 11'
  /tmp/testlibRpZj1Y/source/yakkety/apparmor-2.10.95/tests/regression/apparmor/prologue.inc: line 219:   628 Segmentation fault      $testexec "$@" > $outfile 2>&1
  Error: transition failed. Test 'EXEC_STACK (2 stacked - bad label)' was expected to 'fail'. Reason for failure 'killed by signal 11'
  /tmp/testlibRpZj1Y/source/yakkety/apparmor-2.10.95/tests/regression/apparmor/prologue.inc: line 219:   634 Segmentation fault      $testexec "$@" > $outfile 2>&1
  Error: transition failed. Test 'EXEC_STACK (2 stacked - bad mode)' was expected to 'fail'. Reason for failure 'killed by signal 11'
  /tmp/testlibRpZj1Y/source/yakkety/apparmor-2.10.95/tests/regression/apparmor/prologue.inc: line 219:   741 Segmentation fault      $testexec "$@" > $outfile 2>&1
  Error: transition failed. Test 'EXEC_STACK (3 stacked - file)' was expected to 'fail'. Reason for failure expect errno 13 != 139
  /tmp/testlibRpZj1Y/source/yakkety/apparmor-2.10.95/tests/regression/apparmor/prologue.inc: line 219:   745 Segmentation fault      $testexec "$@" > $outfile 2>&1
  Error: transition failed. Test 'EXEC_STACK (3 stacked - otherfile)' was expected to 'fail'. Reason for failure expect errno 13 != 139
  /tmp/testlibRpZj1Y/source/yakkety/apparmor-2.10.95/tests/regression/apparmor/prologue.inc: line 219:   747 Segmentation fault      $testexec "$@" > $outfile 2>&1
  Error: transition failed. Test 'EXEC_STACK (3 stacked - thirdfile)' was expected to 'fail'. Reason for failure expect errno 13 != 139
  /tmp/testlibRpZj1Y/source/yakkety/apparmor-2.10.95/tests/regression/apparmor/prologue.inc: line 219:   748 Segmentation fault      $testexec "$@" > $outfile 2>&1
  Error: transition failed. Test 'EXEC_STACK (3 stacked - sharedfile)' was expected to 'pass'. Reason for failure 'killed by signal 11'
  /tmp/testlibRpZj1Y/source/yakkety/apparmor-2.10.95/tests/regression/apparmor/prologue.inc: line 219:   754 Segmentation fault      $testexec "$@" > $outfile 2>&1
  Error: transition failed. Test 'EXEC_STACK (3 stacked - okcon)' was expected to 'pass'. Reason for failure 'killed by signal 11'
  /tmp/testlibRpZj1Y/source/yakkety/apparmor-2.10.95/tests/regression/apparmor/prologue.inc: line 219:   833 Segmentation fault      $testexec "$@" > $outfile 2>&1
  Error: transition failed. Test 'EXEC_STACK (3 stacked - old AA WARN)' was expected to 'pass'. Reason for failure 'killed by signal 11'

  The previous command should result in no output and return value of 0
  once the regression test is properly updated.

  [Regression Potential]

   * This is an extremely low risk change since it only touches
  regression testing code that is not user-facing.

  [Other]

  * Fixed in upstream lp:apparmor tree:

    https://bazaar.launchpad.net/~apparmor-
  dev/apparmor/master/revision/3509

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