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

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Message-ID: <CABCJKuenkHXtbWOLZ0_isGewxd19qkM7OcLeE2NzM6dSkXS4mQ@mail.gmail.com>
Date:   Mon, 10 Oct 2022 16:15:33 -0700
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>
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 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:

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

Sami