[murderfs]

> AOSP made it increasingly difficult to contribute without being an Android partner and it's nearly impossible now.

Yes, by "upstream", I mean "upstream Android".

> Google didn't invent MTE or memory tagging.

Sure, they didn't invent memory tagging (SPARC ADI was an implementation from a decade ago, and I'd bet IBM had an implementation of something similar in like the 70s, judging by the rest of ISA innovations in the last decade), but they definitely invented the instantiation of it in ARM. Pretty much everything aside from instruction encoding for MTE was specified in a doc sent by Google to ARM in response to ARM telling Google something along the lines of "the entirety of our efforts in the security space are going to be spent on something that you're not going to see any benefit from within the next decade: CHERI aka Morello aka Arran".