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

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Message-ID: <20250410133446.GF9833@noisy.programming.kicks-ass.net>
Date: Thu, 10 Apr 2025 15:34:46 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc: 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>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Nathan Chancellor <nathan@...nel.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org
Subject: Re: [PATCH] x86/Kconfig: make CFI_AUTO_DEFAULT depend on !RUST

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 :-(

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.