** Also affects: eglibc (Ubuntu)
Importance: Undecided
Status: New
** No longer affects: eglibc (Ubuntu Utopic)
** No longer affects: glibc (Ubuntu Trusty)
** Changed in: eglibc (Ubuntu)
Status: New => Invalid
** Changed in: eglibc (Ubuntu Trusty)
Status: New => In Progress
** Changed in: eglibc (Ubuntu Trusty)
Assignee: (unassigned) => Chris J Arges (arges)
** Changed in: eglibc (Ubuntu Trusty)
Importance: Undecided => Medium
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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:
In Progress
Status in glibc source package in Utopic:
In Progress
Status in glibc package in Debian:
Unknown
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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/eglibc/+bug/1398975/+subscriptions
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