This was a very useful lecture for those who are new to Linux kernel hacking. The core content was explained in an easy-to-understand manner, and the learning examples using QEMU made it even easier to understand. https://defenit.kr/2019/12/03/Pwn/%E3%84%B4%20Research/linux-kenel-bpf/ I think it would be more effective to study in conjunction with the link above, which is Team Defenit's kernel LPE vulnerability analysis data. I am learning a lot in many ways. Thank you.