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

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Message-ID: <CAH5fLggm0Q_EGMHXG6Vu2_7mUPdHd46HC=5dPALRAAOXE8yHSA@mail.gmail.com>
Date: Thu, 10 Apr 2025 17:04:07 +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
Subject: Re: [PATCH] x86/Kconfig: make CFI_AUTO_DEFAULT depend on !RUST

On Thu, Apr 10, 2025 at 4:15 PM Peter Zijlstra <peterz@...radead.org> wrote:
>
> On Thu, Apr 10, 2025 at 04:05:54PM +0200, Miguel Ojeda wrote:
> > On Thu, Apr 10, 2025 at 3:57 PM Peter Zijlstra <peterz@...radead.org> wrote:
> > If you mean fixing it upstream, definitely, but we should still
> > prevent people from building an invalid kernel, i.e. when Alice's PR
> > or similar lands upstream, then we can relax the `depends on` based on
> > the Rust version (which is something we have done for other bits).
>
> So why wasn't any of this a problem when Rust enabled kCFI? Surely the
> testing back then included FineIBT. That has been in longer than rust's
> kcfi support (integer type confusion etc.).

I assume this has been a problem for a while. The testing we did with
FineIBT must not have triggered this codepath. But Rust drivers have
used the codepath for a long time.

Alice