This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
trusty' to 'verification-done-trusty'. If the problem still exists,
change the tag 'verification-needed-trusty' to 'verification-failed-
trusty'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-trusty

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https://bugs.launchpad.net/bugs/1779848

Title:
  Cleanup Meltdown/Spectre implementation

Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Trusty:
  Fix Committed

Bug description:
  == SRU Justification ==

  Ubuntu kernels contain Meltdown and Spectre mitigations that are
  largely based on embargoed patches but what eventually landed in
  upstream is different in some places. We should clean up the different
  kernels to bring them closer in line with upstream.

  == Fix ==

  Add missing upstream patches.

  == Regression Potential ==

  Medium. The patches have been in upstream for quite a while now and
  are baked in but some of the backporting is not completely trivial and
  without risk.

  == Test Case ==

  TBD.

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