Cook: Security things in Linux v5.9

Kees Cook has posted along list of security-related improvements that made it into the 5.9kernel release. "Sasha Levin, Andy Lutomirski, Chang S. Bae, AndiKleen, Tony Luck, Thomas Gleixner, and others landed the long-awaitedFSGSBASE series. This provides task switching performance improvementswhile keeping the kernel safe from modules accidentally (or maliciously)trying to use the features directly (which exposed an unprivileged directkernel access hole)."