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[Launchpad Bug Tracker <1630069@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.8.0-21.23

---------------
linux (4.8.0-21.23) yakkety; urgency=low

  [ Tim Gardner ]

  * Release Tracking Bug
    - LP: #1630279

  * powerpc 4.8.0-17 fails to boot on PowerMac G5 (LP: #1628968)
    - Revert "Revert "powerpc: Simplify module TOC handling""

  * Regression tests can not detect binfmt_elf mmpa semantic change
    (LP: #1630069)
    - SAUCE: apparmor: add flag to detect semantic change, to binfmt_elf mmap

  * Autofs parameter substitution broken in kernel 4.4.0-38 and 4.4.0-40
    (LP: #1629204)
    - SAUCE: (namespace) autofs4: Use real_cred for requestor's ids

 -- Tim Gardner <tim.gardner@xxxxxxxxxxxxx>  Tue, 04 Oct 2016 08:01:21
-0600

** Changed in: linux (Ubuntu Yakkety)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1630069

Title:
  Regression tests can not detect binfmt_elf mmpa semantic change

Status in AppArmor:
  Fix Committed
Status in apparmor package in Ubuntu:
  New
Status in linux package in Ubuntu:
  Fix Released
Status in apparmor source package in Xenial:
  In Progress
Status in linux source package in Xenial:
  New
Status in apparmor source package in Yakkety:
  Won't Fix
Status in linux source package in Yakkety:
  Fix Released

Bug description:
  == apparmor SRU ==

  [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

   * The regression tests were fixed for this kernel change but they were fixed
     in a way that always assumed that kernel change is present. They should have
     been adjusted so that they act differently according to whether or not the
     kernel change is present (it is a change that could end up being backported
     through the stable trees).

  [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

   The previous command should result in no output and return value of
  0.

  [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/3558

  == Original description ==

  The regression tests are currently hard coded to the semantics of mmap
  in binfmt_elf

  With the recent upstream commit
  9f834ec18defc369d73ccf9e87a2790bfa05bf46 the cred used for the mmap
  changed resulting in test failures. The tests have been patched for
  this change but it results in the test breaking for everyone using
  upstream releases against pre 4.8 kernels.

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