[$] Progress on toolchain security features

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