** Changed in: linux (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1789834
Title:
off-by-one bug in L1TF mitigation
Status in linux package in Ubuntu:
Confirmed
Bug description:
due to an off-by-one bug in the L1TF patch, the "rare" case of systems still
vulnerable
is more frequent.
This typically happens on Nehalem+ destop/entry-level server systems
with 32G memory installed.
Originally this was reported in OpenSUSE, but I can confirm this is
also happens with the latest trusty kernel (3.13.0-157-generic)
https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=b0a182f875689647b014bc01d36b340217792852
The following patch increases the memory limit for the mitigation on
these systems in general:
https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=x86/urgent&id=cc51e5428ea54f575d49cfcede1d4cb3a72b4ec4
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