Linux Kernel Live-Patching Continues Work On Atomic Replace & Cumulative Patches
Written by Michael Larabel in Linux Kernel on 9 January 2019 at 08:19 AM EST. Add A Comment
LINUX KERNEL --
Not making it for the Linux 5.0 kernel but continuing to be revised is atomic replace functionality for the livepatching code. The Linux livepatch atomic replace feature allows for cumulative patches and the ability to remove a patch lower in the stack / patch series.

Petr Mladek on Wednesday sent out the fifteenth version of these patches implementing atomic replace within the kernel's common livepatch code. This livepatch functionality was worked on in part by Akamai and motivated to offer the ability to revert a previously applied livepatch.

The technical details on the current implementation and intended workflow can be found from this particular patch and the documentation.

The two thousand plus lines of code getting this live-patching atomic replace support working can be reviewed on the kernel mailing list. With kernel live-patching being increasingly common across Linux distributions for being able to patch kernels primarily for security issues while avoiding the downtime of kernel reboots, hopefully the atomic replace / cumulative patches feature will be ready in time for the Linux 5.1 kernel next quarter.
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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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