linux-hardening - Re: [PATCH 5/5] kcfi: Rename CONFIG_CFI_CLANG to CONFIG

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Message-ID: <202508250834.E2456B9@keescook>
Date: Mon, 25 Aug 2025 08:35:14 -0700
From: Kees Cook <kees@...nel.org>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Kees Cook <kees@...flux.net>,
	Sami Tolvanen <samitolvanen@...gle.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	Puranjay Mohan <puranjay@...nel.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Jonathan Corbet <corbet@....net>,
	Nathan Chancellor <nathan@...nel.org>, x86@...nel.org,
	linux-doc@...r.kernel.org, linux-kbuild@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-riscv@...ts.infradead.org, llvm@...ts.linux.dev,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH 5/5] kcfi: Rename CONFIG_CFI_CLANG to CONFIG_CFI

On Mon, Aug 25, 2025 at 05:01:13PM +0200, Miguel Ojeda wrote:
> On Mon, Aug 25, 2025 at 4:28 PM Kees Cook <kees@...nel.org> wrote:
> >
> > -config CFI_CLANG
> > -       bool "Use Clang's Control Flow Integrity (CFI)"
> > -       depends on ARCH_SUPPORTS_CFI_CLANG
> > +config CFI
> > +       bool "Use Kernel Control Flow Integrity (kCFI)"
> > +       depends on ARCH_SUPPORTS_CFI
> >         depends on $(cc-option,-fsanitize=kcfi)
> >         help
> 
> Do we need to do something to make the transition smoother, i.e.
> keeping the old one for a while to avoid a new question etc.?

Yeah, that's a good idea. What the right way to do that?

config CFI_CLANG
	bool "Use Clang's Control Flow Integrity (CFI)"
	depends on ARCH_SUPPORTS_CFI
	select CFI

?

-- 
Kees Cook