You'd have to be more specific! For a long time OpenBSD was focussed on security through correctness and code review, so that portion is not necessarily reflec

You'd have to be more specific! For a long time OpenBSD was focussed on security through correctness and code review, so that portion is not necessarily reflected in any of the grsecurity/pax type hardened linuxes. But OpenBSD does have things like ASLR and kernel address randomization, advanced memory protection (W^X etc) and while it doesn't have ACLs or PAM it has pledge which is a great way of restricting system call access at the program level.