https://chrisarges.net/tags/livepatch/Recent content in Livepatch on Chris J ArgesHugoenMon, 21 Sep 2015 13:03:26 -0500https://chrisarges.net/posts/2015-09-21-livepatch-on-ubuntu/Mon, 21 Sep 2015 13:03:26 -0500https://chrisarges.net/posts/2015-09-21-livepatch-on-ubuntu/<p>Livepatching was <a href="https://lkml.org/lkml/2014/11/6/387">introduced</a> in the v4.0 kernel, and now Ubuntu 15.10 has a kernel capable of using this new and exciting feature. This works by using ftrace to redirect kernel function calls to the newly patched functions. In addition mechanisms for hooking into module insertion and removal are used for patching loadable modules. This feature also has sysfs directories for tracking which patches are applied and which functions they modify. With the basics aside, this blog post will show some simple examples of how to livepatch your kernel.</p>