touch-packages team mailing list archive

[Chris J Arges <1398975@xxxxxxxxxxxxxxxxxx>]

Ok I was able to verify this for utopic with the following:
1) reproduce bug 1370352 by installing intel-microcode 2.20140913.1ubuntu1
2) install -proposed glibc
3) try to reproduce bug, and now it works!

Trusty doesn't reproduce bug 1370352 (maybe because we're not triggering
the right kind of pthread programs when we update microcode). But
-proposed onto trusty didn't cause any issues and I was able to update
microcodes as normal.


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

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Touch seeded packages, which is subscribed to eglibc in Ubuntu.
https://bugs.launchpad.net/bugs/1398975

Title:
  hardware-assisted lock elision hazardous on x86

Status in eglibc package in Ubuntu:
  Invalid
Status in glibc package in Ubuntu:
  Fix Released
Status in eglibc source package in Trusty:
  Fix Committed
Status in glibc source package in Utopic:
  Fix Committed
Status in glibc package in Debian:
  Fix Released

Bug description:
  [Impact]
  See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=762195 for a full description of the issue.
  HLE extensions are hazardous due to erratum HSD136.

  Users that upgrade their intel-microcode could encounter illegal
  instruction traps due to microcode updates that blacklist HLE
  instructions. Glibc uses those instructions and thus we need to be
  defensive and patch them here.

  The issue was originally seen here:
  https://bugs.launchpad.net/intel/+bug/1370352

  [Test Case]
  Update to latest intel-microcode with microcode-20140913.dat enabled. Try to boot machine and use applications; check dmesg for trap invalid opcodes in libpthread-2.19.so.

  [Regression Potential]
  This has been fixed in vivid, so I'm requesting this patch be backported to T/U.

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