off-by-one bug in L1TF mitigation
Bug #1789834 reported by
Markus Schade
This bug report is a duplicate of:
Bug #1788563: L1TF mitigation not effective in some CPU and RAM combinations.
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This bug affects 1 person
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Triaged
|
Medium
|
Unassigned | ||
Trusty |
Triaged
|
Medium
|
Unassigned | ||
Xenial |
Triaged
|
Medium
|
Unassigned | ||
Bionic |
Triaged
|
Medium
|
Unassigned |
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-
The following patch increases the memory limit for the mitigation on these systems in general:
description: | updated |
Changed in linux (Ubuntu): | |
status: | New → Confirmed |
Changed in linux (Ubuntu): | |
importance: | Undecided → Medium |
Changed in linux (Ubuntu Trusty): | |
status: | New → Incomplete |
Changed in linux (Ubuntu): | |
status: | Confirmed → Incomplete |
Changed in linux (Ubuntu Trusty): | |
importance: | Undecided → Medium |
status: | Incomplete → Triaged |
Changed in linux (Ubuntu): | |
status: | Incomplete → Triaged |
tags: | added: kernel-da-key trusty |
Changed in linux (Ubuntu Xenial): | |
status: | New → Triaged |
Changed in linux (Ubuntu Bionic): | |
status: | New → Triaged |
Changed in linux (Ubuntu Xenial): | |
importance: | Undecided → Medium |
Changed in linux (Ubuntu Bionic): | |
importance: | Undecided → Medium |
tags: | added: cscc |
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This happens pretty much on all Ubuntu kernels with the initial L1TF implementation, so xenial, bionic and cosmic are also affected.
https:/ /cdn.kernel. org/pub/ linux/kernel/ v4.x/ChangeLog- 4.4.154 /cdn.kernel. org/pub/ linux/kernel/ v4.x/ChangeLog- 4.18.6
https:/