linux-kernel - Re: [PATCH v24 21/28] riscv: kernel command line option to opt out of user cfi

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Message-ID: <20273cd5-afbc-4208-aa2a-11ac04256c38@infradead.org>
Date: Thu, 4 Dec 2025 14:13:49 -0800
From: Randy Dunlap <rdunlap@...radead.org>
To: Deepak Gupta <debug@...osinc.com>, Thomas Gleixner <tglx@...utronix.de>,
 Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
 Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
 "H. Peter Anvin" <hpa@...or.com>, Andrew Morton <akpm@...ux-foundation.org>,
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 <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
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 Krzysztof Kozlowski <krzk+dt@...nel.org>, Arnd Bergmann <arnd@...db.de>,
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Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
 linux-mm@...ck.org, linux-riscv@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-arch@...r.kernel.org,
 linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org,
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 rick.p.edgecombe@...el.com, rust-for-linux@...r.kernel.org,
 Paul Walmsley <pjw@...nel.org>,
 Valentin Haudiquet <valentin.haudiquet@...onical.com>
Subject: Re: [PATCH v24 21/28] riscv: kernel command line option to opt out of
 user cfi

On 12/4/25 12:04 PM, Deepak Gupta wrote:
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 6c42061ca20e..453127ef8746 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -6453,6 +6453,14 @@
>  			replacement properties are not found. See the Kconfig
>  			entry for RISCV_ISA_FALLBACK.
>  
> +	riscv_nousercfi=
> +		all	Disable user cfi ABI to userspace even if cpu extension

			                                              extensions

> +			are available.
> +		bcfi	Disable user backward cfi ABI to userspace even if
> +			shadow stack extension is available.
> +		fcfi	Disable user forward cfi ABI to userspace even if landing
> +			pad extension is available.
> +
>  	ro		[KNL] Mount root device read-only on boot
>  
>  	rodata=		[KNL,EARLY]

-- 
~Randy