[$] Progress on toolchain security features

Over the years, there has been steady progress in adding security features tocompilers and other tools to assist with hardening the Linux kernel (and, of course, otherprograms). In something of a tradition in the toolchainstrack at the LinuxPlumbers Conference, Kees Cook and Qing Zhao have led a session on that progress andfurther plans; this year, they were joined by Justin Stitt (YouTube video).