Re: [PATCH] static_call,x86: Robustify trampoline patching

Peter Zijlstra
2021-10-31T20:45:16Z

On Sun, Oct 31, 2021 at 09:21:56PM +0100, Ard Biesheuvel wrote:

> That means we can support static calls on arm64 now without breaking
> Clang CFI, and work on a solution for the redundant jumps on a more
> relaxed schedule.

Yes, arm64 has a 'problem' with having already merged the clang-cfi
stuff :/

I'm hoping the x86 solution can be an alternative CFI scheme, I'm
starting to really hate this one. And I'm not at all convinced the
proposed scheme is the best possible scheme given the constraints of
kernel code. AFAICT it's a compromise made in userspace.