linux-kernel - Re: [PATCH v2] rust: add flags for shadow call stack sanitizer

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Message-ID: <CANiq72mzMBDJnkSW_EDaVdAEHbWtsLL6-unY0R2nOpexhHbfhg@mail.gmail.com>
Date: Tue, 9 Apr 2024 17:55:04 +0200
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Will Deacon <will@...nel.org>
Cc: Alice Ryhl <aliceryhl@...gle.com>, Catalin Marinas <catalin.marinas@....com>, 
	Jamie Cunliffe <Jamie.Cunliffe@....com>, Sami Tolvanen <samitolvanen@...gle.com>, 
	Masahiro Yamada <masahiroy@...nel.org>, Nathan Chancellor <nathan@...nel.org>, 
	Nicolas Schier <nicolas@...sle.eu>, Ard Biesheuvel <ardb@...nel.org>, Marc Zyngier <maz@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, Mark Brown <broonie@...nel.org>, 
	Nick Desaulniers <ndesaulniers@...gle.com>, Kees Cook <keescook@...omium.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>, 
	Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...sung.com>, 
	Valentin Obst <kernel@...entinobst.de>, linux-kbuild@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	rust-for-linux@...r.kernel.org
Subject: Re: [PATCH v2] rust: add flags for shadow call stack sanitizer

On Tue, Apr 9, 2024 at 12:31 PM Will Deacon <will@...nel.org> wrote:
>
> I think we have time to do this properly, like we did for the clang
> enablement a few years ago. In hindsight, avoiding hacks for the early
> toolchains back then was a really good idea because it meant we could
> rely on a solid baseline set of compiler features from the start.

Yeah, it sounds fair, thanks!

After the warning is fixed (i.e. `-Zfixed-x18` or similar is
implemented etc.), I would recommend adding support to the kernel for
the `-Z` (unstable) flags, similar to this patch, in order to test
them easily and getting `rustc` to stabilize them. Then the only
change required should be a name change to `-C` or similar.

Cheers,
Miguel