linux-kernel - Re: [PATCH v1 0/2] RISC-V: enable rust

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Date: Sat, 10 Feb 2024 02:13:06 -0600
From: Trevor Gross <tmgross@...ch.edu>
To: Conor Dooley <conor@...nel.org>
Cc: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>, 
	Conor Dooley <conor.dooley@...rochip.com>, linux-riscv@...ts.infradead.org, 
	Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	Wedson Almeida Filho <wedsonaf@...il.com>, Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Jonathan Corbet <corbet@....net>, Paul Walmsley <paul.walmsley@...ive.com>, 
	Palmer Dabbelt <palmer@...belt.com>, Nathan Chancellor <nathan@...nel.org>, 
	Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>, 
	rust-for-linux@...r.kernel.org, linux-doc@...r.kernel.org, 
	linux-kernel@...r.kernel.org, llvm@...ts.linux.dev, 
	Matthew Maurer <mmaurer@...gle.com>, Ramon de C Valle <rcvalle@...gle.com>, 
	Sami Tolvanen <samitolvanen@...gle.com>
Subject: Re: [PATCH v1 0/2] RISC-V: enable rust

On Fri, Feb 9, 2024 at 9:18 AM Conor Dooley <conor@...nel.org> wrote:
>
> On Sat, Jan 27, 2024 at 02:46:38PM +0100, Miguel Ojeda wrote:
> > On Fri, Jan 26, 2024 at 11:01 PM Conor Dooley <conor@...nel.org> wrote:
> > >
> > > Is that even needed? We already have ARCH_SUPPORTS_CFI_CLANG and AFAIU
> > > rust supports it if clang does, so a second option is superfluous?
> >
> > From a quick look, I don't see it enabled in any RISC-V built-in
> > target in `rustc` yet.
> >
> > It may also still be the case that KCFI needs some tweaks for, say,
> > RISC-V, before the flag actually works, i.e. we couldn't just test the
> > flag in that case -- Ramon: how likely is it that RISC-V would work if
> > KCFI works for aarch64 and x86_64?
>
> Well, there's been no reply here. I'll do sa you suggested and add a
> depends on !CFI_CLANG to RUST.
>
> Cheers,
> Conor.
>

I asked on Zulip and it sounds like Ramon may be out [1]. It
_probably_ works, but going with a dependency to not be blocked on
KCFI is probably reasonable for now.

- Trevor

[1]: https://rust-lang.zulipchat.com/#narrow/stream/343119-project-exploit-mitigations/topic/KCFI.20on.20RISC-V.20questions