linux-hardening - Re: [PATCH 3/5] x86/cfi: Add option for cfi=debug bootparam

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Message-ID: <202508250833.AB86A99894@keescook>
Date: Mon, 25 Aug 2025 08:34:00 -0700
From: Kees Cook <kees@...nel.org>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Sami Tolvanen <samitolvanen@...gle.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	Puranjay Mohan <puranjay@...nel.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 3/5] x86/cfi: Add option for cfi=debug bootparam

On Mon, Aug 25, 2025 at 07:25:50AM -0700, Kees Cook wrote:
>  static void __apply_fineibt(s32 *start_retpoline, s32 *end_retpoline,
>  			    s32 *start_cfi, s32 *end_cfi, bool builtin)
>  {
> +	if (builtin)
> +		pr_info("CFI: Using standard kCFI\n");
>  }

Oops, this needs IS_ENABLED(CONFIG_CFI) && ...

-- 
Kees Cook