linux-kernel - Re: [PATCH] x86/Kconfig: make CFI_AUTO

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Message-ID: <CAH5fLghrcqSYwkqbC4SSp6oYCny0riMRGA6W+oqQ69aA=NwYWw@mail.gmail.com>
Date: Thu, 10 Apr 2025 15:59:53 +0200
From: Alice Ryhl <aliceryhl@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>, Paweł Anikiel <panikiel@...gle.com>, 
	Sami Tolvanen <samitolvanen@...gle.com>, Kees Cook <kees@...nel.org>, 
	Alex Gaynor <alex.gaynor@...il.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, Ingo Molnar <mingo@...hat.com>, 
	Josh Poimboeuf <jpoimboe@...nel.org>, Masahiro Yamada <masahiroy@...nel.org>, 
	Miguel Ojeda <ojeda@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, 
	Nathan Chancellor <nathan@...nel.org>, x86@...nel.org, linux-kernel@...r.kernel.org, 
	rust-for-linux@...r.kernel.org, Matthew Maurer <mmaurer@...gle.com>, 
	Ramon de C Valle <rcvalle@...gle.com>
Subject: Re: [PATCH] x86/Kconfig: make CFI_AUTO_DEFAULT depend on !RUST

On Thu, Apr 10, 2025 at 3:34 PM Peter Zijlstra <peterz@...radead.org> wrote:
>
> On Thu, Apr 10, 2025 at 03:27:55PM +0200, Miguel Ojeda wrote:
> > On Thu, Apr 10, 2025 at 3:26 PM Peter Zijlstra <peterz@...radead.org> wrote:
> > >
> > > New compiler can't build old core?
> >
> > No, that is not intended to work -- `core` is tied to the compiler.
>
> OMFG, you just gave me another reason to hate on this rust-bucket of a
> language :-/ What language can't even build an old version of its own
> runtime :-(

I don't think there's anything unreasonable about having a place to
put logic that depends on compiler internals.

> Anyway, given this core nonsense is now CFI unsound, it is no longer
> suitable to build the kernel. So either refrain from using part of the
> core that trips this, or get it fixed asap.

I submitted a PR that I believe should fix it:
https://github.com/rust-lang/rust/pull/139632

Alice