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

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Message-ID: <20250825155923.GY3245006@noisy.programming.kicks-ass.net>
Date: Mon, 25 Aug 2025 17:59:23 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Kees Cook <kees@...nel.org>
Cc: Kees Cook <kees@...flux.net>, 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:


> +	if (builtin && cfi_debug)
> +		if (builtin && cfi_debug)
> +		if (builtin && cfi_debug)
> +		if (builtin && cfi_debug)
> +		if (builtin && cfi_debug)
> +		if (builtin && cfi_debug)
> +		if (builtin && cfi_debug)
> +		if (builtin && cfi_debug)
> +		if (builtin && cfi_debug)

You could just make that cfi_debug and add:

	if (builtin)
		cfi_debug = false;

at the very end of __apply_fineibt().