From #18553:

theuni

Sidenote: we could potentially add a check for illegal instructions in the .text.startup section in one of our python binary checking tools. Though we'd have to create a per-arch blacklist/whitelist to define "illegal".

laanwj

My idea was to forbid .text.startup sections completely in all 'special' compilation units, e.g. those compiled with non-default instruction sets. I think that's easier to implement a check for than instruction white/blacklists.