Deep Dive Into Linux Kernel Livepatch

Explore the intricacies of Linux kernel livepatching in this comprehensive conference talk. Delve into the motivation behind livepatch technology, which allows critical Linux machines to receive security updates without rebooting. Learn about the implementation of livepatch through kernel modules and the use of Ftrace for redirecting code execution. Gain a detailed understanding of kernel livepatch structure, kpatch functionality, and the prerequisites for writing effective livepatches. Witness a practical demonstration of livepatch in action using kpatch-build, and discover the importance of ELF sections in the process. Examine the limitations of livepatch technology and acquire the knowledge needed to create livepatches for real-world bug fixes. By the end of this talk, develop a comprehensive grasp of kernel livepatching techniques and their practical applications in maintaining secure and up-to-date Linux systems.