Spectre Variant One Mitigations Will Be Sent In For Linux 4.16
Written by Michael Larabel in Linux Kernel on 20 January 2018 at 04:58 PM EST. 27 Comments
LINUX KERNEL --
The Linux 4.16 kernel will feature Spectre Variant One "Bounds Check Bypass" mitigations.

Retpolines and the CPU microcode updates have been for Spectre Variant Two while now a set of Linux kernel patches have been called for merging into -next for the upcoming Linux 4.16 kernel cycle.

Dan Williams of Intel has called for the collection of Spectre Variant One mitigations to be pulled. This includes a number of kernel changes outlined via this mailing list post.

Separately there is also a new Spectre v2 patch series under "request for comments" to use the new CPU microcode features for speculation control on Intel and AMD CPUs. The patches also allow for Indirect Branch Prediction Barrier (IBPB) for KVM guests.

Certainly it's been a busy month in the Linux security space and there still is more work to be done for fully addressing Spectre on all vulnerable CPUs.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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