RE: [PATCH] retpoline/module: Taint kernel for missing retpoline in module

[Van De Ven, Arjan]

> > When the a module hasn't been compiled with a retpoline
> > aware compiler, print a warning and set a taint flag.
> 
> Isn't that caught by the "build with a different compiler/version" check
> that we have?  Or used to have?  If not, can't we just make it into that
> type of check to catch this type of problem no matter what type of
> feature/option it is trying to catch?


making retpoline part of the modversion hash thingy could make sense.

but I kinda feel this is a bit overkill; it's not a function issue if you get this wrong, and if you run an ancient or weird out of tree module there's a real chance you have
other security fun as well ;-)