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Bug 643338

Summary: sys-kernel/gentoo-sources-4.9.74, sys-kernel/gentoo-sources-4.4.109: Stabilize kernels with KPTI patches
Product: Gentoo Linux Reporter: QIN Yuhao <qinq_net>
Component: KeywordingAssignee: Gentoo Linux bug wranglers <bug-wranglers>
Severity: normal CC: kfm
Priority: Normal    
Version: unspecified   
Hardware: AMD64   
OS: Linux   
Package list:
Runtime testing required: ---

Description QIN Yuhao 2018-01-04 00:26:12 UTC
There has been a critical design vulnerability in all Intel processors, which has recently caused all long-term Linux versions to apply the KPTI (formerly called KAISER) patch. It would fix such bug by totally separate kernel and user-mode pages, causing compilation performance to suffer from up to 30% penalty. The patch was applied to 4.14.11, 4.9.74 and 4.4.109. We should stabilize 4.9.74 and 4.4.109 and even mask those beforehand to ensure security of our systems.

Reproducible: Always
Comment 1 ᎫᏤᏣ (kuzetsa) 2018-01-04 00:46:13 UTC
Comment 2 Kerin Millar 2018-01-04 01:02:56 UTC
That would seem premature as 4.4.109 and 4.9.74 do not contain the necessary patches. They are accumulating in queue-4.4 and queue-4.9 at the time of writing.
Comment 3 Kerin Millar 2018-01-04 15:33:11 UTC

*** This bug has been marked as a duplicate of bug 643352 ***