On Mon, Nov 11, 2019 at 03:55:35PM +0100, Jann Horn wrote: > Not on Linux, but on OpenBSD, they do use MAP_STACK now AFAIK; this > was announced here: > <http://openbsd-archive.7691.n7.nabble.com/stack-register-checking-td338238.html>. > Basically they periodically check whether the userspace stack pointer > points into a MAP_STACK region, and if not, they kill the process. So > even if it's a no-op on Linux... Hmm, is that something we should do in Linux? Even if we only check on syscall entry, which should be pretty inexpensive, it seems like it would be very effective in protecting various ROP techniques. - Ted
