Re: [PATCH v10 25/27] x86: enable initial Rust support

[Sami Tolvanen]

On Fri, Oct 7, 2022 at 10:18 AM Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
>
> On Tue, Sep 27, 2022 at 03:14:56PM +0200, Miguel Ojeda wrote:
> > Note that only x86_64 is covered and not all features nor mitigations
> > are handled, but it is enough as a starting point and showcases
> > the basics needed to add Rust support for a new architecture.
>
> Does it fail the build if required options are missing? Specifically are
> things like kCFI and IBT enabled? Silently not handling those will
> result in an unbootable image.

Rust supports IBT with -Z cf-protection=branch, but I don't see this
option being enabled in the kernel yet. Cross-language CFI is going to
require a lot more work though because the type systems are not quite
compatible:

https://github.com/rust-lang/rfcs/pull/3296

Sami