IBM S/390 Linux 4.19 Kernel Code Sees More Spectre Updates, Boot Code Rework
Written by Michael Larabel in Security on 13 August 2018 at 05:40 AM EDT. Add A Comment
SECURITY --
The IBM System/390 "s390" architecture code has seen a number of improvements for Linux 4.19.

Highlights of the s390 code updates sent in today for the just-opened Linux 4.19 kernel merge window include:

- Continued mitigation around the Spectre speculative execution vulnerabilities for s390. This latest batch of updates include adding Expolines to a few more indirect branches among other work.

- Large page support for KVM guests.

- A large rework to the s390 early boot code to improve the integration around the Kernel Address Sanitizer "KASAN" and address space layout randomization "KASLR".

- The Linux kernel GCC plug-ins support is re-enabled for s390.

- Some cleanups of warnings generated when compiling the s390 Linux kernel under GCC 8.

- Various bug fixes and other code improvements.

Those interested in IBM s390 can find the complete list of patches for the 4.19 kernel via this pull request.
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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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