[Veliladon]

ARM for instance has pointer authentication built into its hardware since version 8.3 of the ISA. While it's not the same implementation as OpenBSD, it has the same practical effect of making sure the return address is valid.

[beachhead]

Right. So, how does that render OpenBSD's useless? Maybe I'm not being clear about what I'm asking here. I'm not comparing software vs hardware CFI. OpenBSD doesn't have support for PAC or CET (That I know of) but that doesn't mean they won't in the future. Should there be no software CFI then? Perhaps they would eventually complement each other?