I was never able to reproduce this issue on Ubuntu 14.04 but, after
reviewing the Spectre V2 mitigations in the 3.13 based 14.04 kernel, I
think the 14.04 kernel could be affected by this bug. Additionally, I
didn't want the decision on when to make use of IBPB to be different in
14.04 than in all of the newer Ubuntu releases (16.04, 17.10, and soon
to be 18.04). That's why I marked this bug as affecting 14.04 and
submitted a fix for that kernel.

That being said, I don't think that we have any 14.04 users watching
this bug so I did some SRU verification work myself. I installed sssd,
the 3.13.0-145.194 kernel from trusty-proposed, and experienced no
issues. I verified that the /proc/sys/kernel/ibpb_enabled file reported
'1', indicating that IBPB was enabled. I also verified that the
IBRS/IBPB/retpoline/spectre messages emitted from the kernel at boot
time were as-expected. Retpoline was present, IBRS was disabled (due to
retpoline), and IBPB was enabled.

** Tags removed: verification-needed-trusty
** Tags added: verification-done-trusty

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  intel-microcode 3.20180312.0 causes lockup at login screen(w/ linux-

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