From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 839A32FE052; Mon, 25 Aug 2025 15:35:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756136115; cv=none; b=GVbe0m2c1XWXTlxfgH++vb9B8z/lwqcjv8dsk7XG46ZqbmWpqcq/jinJCAErXoiDyrx3ZbhWagEHtXqFY9R9UVzC+miY9JOJpKPRM6PvWvyU4AlYVNcqcrn9fPb5+7LTAGBMmQLvHj0jYsiIpHRlUVhpdJBwfAw1WuYCCTF7shg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756136115; c=relaxed/simple; bh=DJjOmkVujeC5JzsbUheOOz5HCUqqi0gOpXXCgeiknkM=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=haInm8TzmXxqJ93+PFSzsovFoStt3oOngecXBH1fmUxFRO7qeEpvAiOaZm2IBRgKU18hMi+s4YvQy5dl/8KZjcwl1PZ7rJ/suLpw18i7Lgx8ocg+wcP4Jn/12Gh+khU+KysyK6kiJYk3mLbFD56WdsbK0xi5guF12s14b1KTJJA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=kdmBXcku; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="kdmBXcku" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 011FEC4CEED; Mon, 25 Aug 2025 15:35:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1756136115; bh=DJjOmkVujeC5JzsbUheOOz5HCUqqi0gOpXXCgeiknkM=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=kdmBXckubJWHEXmKqcoBXuKEg4sUWopFtgGS8CKU6AYg17qDR9d4sAIFF7YZcTjLg +9bpRB9qMnzrlApo2L4kU8KTtH6EcgOtoChsicI3YfkBfzj3bTXYtQTAvsmdef+4mu jZFOTgnbrqRUuqb+wMsUj7pzNS7gmcdr2KHeo+Bb2Z79HW6SoBTsAHksQkkMSxZeIr m0yNkjx2elCNQ9F5SA2nuLkJmL+4yl9P4s5D64UAf2gU1/uH3I2g1zdoE5ZeomcWI5 35NMHJFivKJtXYbojPIzbyphYxV4aWgHrEIdOtDPkaX0ujVfi3lGMMVyaYnorRZOvv ETPnUGlCWOgNg== Date: Mon, 25 Aug 2025 08:35:14 -0700 From: Kees Cook To: Miguel Ojeda Cc: Peter Zijlstra , Kees Cook , Sami Tolvanen , Linus Walleij , Mark Rutland , Puranjay Mohan , David Woodhouse , Jonathan Corbet , Nathan Chancellor , x86@kernel.org, linux-doc@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org, llvm@lists.linux.dev, linux-hardening@vger.kernel.org Subject: Re: [PATCH 5/5] kcfi: Rename CONFIG_CFI_CLANG to CONFIG_CFI Message-ID: <202508250834.E2456B9@keescook> References: <20250825141316.work.967-kees@kernel.org> <20250825142603.1907143-5-kees@kernel.org> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Mon, Aug 25, 2025 at 05:01:13PM +0200, Miguel Ojeda wrote: > On Mon, Aug 25, 2025 at 4:28 PM Kees Cook 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