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

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Message-ID: <20250417081818.GJ38216@noisy.programming.kicks-ass.net>
Date: Thu, 17 Apr 2025 10:18:18 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Kees Cook <kees@...nel.org>
Cc: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Paweł Anikiel <panikiel@...gle.com>,
	Sami Tolvanen <samitolvanen@...gle.com>,
	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 Wed, Apr 16, 2025 at 02:51:55PM -0700, Kees Cook wrote:
> On Wed, Apr 16, 2025 at 10:20:40PM +0200, Peter Zijlstra wrote:
> > On Tue, Apr 15, 2025 at 05:15:31PM +0200, Miguel Ojeda wrote:
> > > On Thu, Apr 10, 2025 at 4:00 PM Alice Ryhl <aliceryhl@...gle.com> wrote:
> > > >
> > > > I submitted a PR that I believe should fix it:
> > > > https://github.com/rust-lang/rust/pull/139632
> > > 
> > > This landed, scheduled for Rust 1.88 (2025-06-26) if all goes well.
> > > 
> > > Peter: are you OK with landing a patch like this? Well, modified to
> > > look like this now that we know the version:
> > > 
> > >     depends on FINEIBT
> > >     depends on !RUST || RUSTC_VERSION >= 108800
> > > 
> > > (assuming we confirm the nightly build works properly)
> > 
> > I don't much like it -- disabling FineIBT at config time like this also
> > kills the CFI type rehash.
> 
> This isn't disabling CONFIG_FINEIBT (which gates cfi_rand), it's making
> FineIBT not enabled by default at boot time. This is actually when I
> created CONFIG_CFI_AUTO_DEFAULT: to be able to have kCFI _with_ type
> rehashing still enabled.

Urgh, yeah, reading hard :-/

OK, Ack