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

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Message-ID: <Y0Ujm6a6bV3+FWM3@hirez.programming.kicks-ass.net>
Date:   Tue, 11 Oct 2022 10:04:43 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     Miguel Ojeda <ojeda@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, patches@...ts.linux.dev,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...gle.com>,
        David Gow <davidgow@...gle.com>,
        Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Jonathan Corbet <corbet@....net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, linux-doc@...r.kernel.org
Subject: Re: [PATCH v10 25/27] x86: enable initial Rust support

On Mon, Oct 10, 2022 at 04:15:33PM -0700, Sami Tolvanen wrote:
> On Fri, Oct 7, 2022 at 10:18 AM Peter Zijlstra <peterz@...radead.org> 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:

Right; so where does that leave us? Are we going to force disable rust
when kCFI is selected ?