This bug was fixed in the package linux - 3.18.0-8.9
---------------
linux (3.18.0-8.9) vivid; urgency=low
[ Leann Ogasawara ]
* Release Tracking Bug
- LP: #1407692
* rebase to v3.18.1
* ubuntu: AUFS -- Resolve build failure union has no member named
'd_child'
[ Upstream Kernel Changes ]
* arm64: optimized copy_to_user and copy_from_user assembly code
- LP: #1400349
* x86, kvm: Clear paravirt_enabled on KVM guests for espfix32's benefit
- LP: #1400314
- CVE-2014-8134
* rebase to v3.18.1
-- Leann Ogasawara <[email protected]> Mon, 05 Jan 2015 09:12:32
-0800
** Changed in: linux (Ubuntu)
Status: Triaged => Fix Released
** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2014-8134
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https://bugs.launchpad.net/bugs/1398596
Title:
[Revert] arm64: optimized copy_to_user and copy_from_user assembly
code
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Trusty:
Triaged
Status in linux source package in Utopic:
Triaged
Bug description:
[Impact]
Fixes an issue where the kernel hits unhandled pagefaults when copy_to_user
is called.
http://www.spinics.net/lists/arm-kernel/msg381811.html
[Test Case]
Put the system under memory pressure.
[Regression Potential]
It will cause a performance regression on certain workloads on arm64 systems.
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