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Date: Mon, 29 Apr 2024 22:35:03 -0700
From: Kees Cook <keescook@chromium.org>
To: Nathan Chancellor <nathan@kernel.org>
Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>, Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>, x86@kernel.org,
	"H. Peter Anvin" <hpa@zytor.com>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Bill Wendling <morbo@google.com>,
	Justin Stitt <justinstitt@google.com>,
	linux-hardening@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, llvm@lists.linux.dev,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] hardening: Refresh KCFI options, add some more
Message-ID: <202404292233.9A98A7C@keescook>
References: <20240426222940.work.884-kees@kernel.org>
 <20240429221650.GA3666021@dev-arch.thelio-3990X>
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On Mon, Apr 29, 2024 at 03:16:50PM -0700, Nathan Chancellor wrote:
> On Fri, Apr 26, 2024 at 03:29:44PM -0700, Kees Cook wrote:
> [...]
> > +# Enable Kernel Control Flow Integrity (currently Clang only).
> > +CONFIG_CFI_CLANG=y
> > +# CONFIG_CFI_PERMISSIVE is not set
> 
> Should this be a part of kernel/configs/hardening.config because RISC-V
> supports it (and 32-bit ARM will soon too)?

Probably yes. I was worried it might be "noisy" for archs that don't
support it, but frankly if someone is using "make hardening.config" they
probably want to know about unsupported options. :)

-- 
Kees Cook