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[Launchpad Bug Tracker <1371316@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:ubuntu/trusty-proposed/linux-keystone

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https://bugs.launchpad.net/bugs/1371316

Title:
  Please cherry-pick an aufs patch to unbreak it in conjunction with IMA

Status in “linux” package in Ubuntu:
  Invalid
Status in “linux-lts-trusty” package in Ubuntu:
  Invalid
Status in “linux” source package in Precise:
  Invalid
Status in “linux-lts-trusty” source package in Precise:
  In Progress
Status in “linux” source package in Trusty:
  Fix Committed
Status in “linux-lts-trusty” source package in Trusty:
  Invalid

Bug description:
  SRU justification

  Impact: when using IMA with aufs in trusty potential exists for very
  hard to diagnose lockups.

  Testcase: enable IMA and use an aufs filesystem.

  Regression Potential: the fix is an upstream cherry-pick from the version of
  aufs in Utopic which is used widly for lxc there so regression potential is low.  The fix removes code which also lessens the risk.

  ===

  The trusty kernel misses the following patch that already landed in
  utopic with the recent aufs update:

  https://github.com/sfjro/aufs3-linux/commit/7aac34b421441b701cd0e6de4685b51e4c462d67

  This unbreaks aufs with IMA (Integrity Measurement Architecture)
  enabled. When IMA is enabled and mmaps are being tracked, the kernel
  hits a lock ordering bug because a needed semaphore is already held.
  This patch fixes this issue by not calling out to IMA for the access
  to the underlying file. However IMA will still see the access to the
  file in the merged aufs, which should be good enough.

  Please cherry-pick above patch.

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