linux-kernel - Re: [PATCH v10 03/40] mman: Add map_shadow

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Message-ID: <Zr4ir5YUxPdwqdkp@arm.com>
Date: Thu, 15 Aug 2024 16:45:51 +0100
From: Catalin Marinas <catalin.marinas@....com>
To: Mark Brown <broonie@...nel.org>
Cc: Will Deacon <will@...nel.org>, Jonathan Corbet <corbet@....net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Marc Zyngier <maz@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	James Morse <james.morse@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
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	Eric Biederman <ebiederm@...ssion.com>,
	Shuah Khan <shuah@...nel.org>,
	"Rick P. Edgecombe" <rick.p.edgecombe@...el.com>,
	Deepak Gupta <debug@...osinc.com>, Ard Biesheuvel <ardb@...nel.org>,
	Szabolcs Nagy <Szabolcs.Nagy@....com>, Kees Cook <kees@...nel.org>,
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	linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
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Subject: Re: [PATCH v10 03/40] mman: Add map_shadow_stack() flags

On Thu, Aug 01, 2024 at 01:06:30PM +0100, Mark Brown wrote:
> In preparation for adding arm64 GCS support make the map_shadow_stack()
> SHADOW_STACK_SET_TOKEN flag generic and add _SET_MARKER. The existing
> flag indicats that a token usable for stack switch should be added to

Nit: indicates

> diff --git a/include/uapi/asm-generic/mman.h b/include/uapi/asm-generic/mman.h
> index 57e8195d0b53..d6a282687af5 100644
> --- a/include/uapi/asm-generic/mman.h
> +++ b/include/uapi/asm-generic/mman.h
> @@ -19,4 +19,8 @@
>  #define MCL_FUTURE	2		/* lock all future mappings */
>  #define MCL_ONFAULT	4		/* lock all pages that are faulted in */
>  
> +#define SHADOW_STACK_SET_TOKEN (1ULL << 0)     /* Set up a restore token in the shadow stack */
> +#define SHADOW_STACK_SET_MARKER (1ULL << 1)     /* Set up a top of stack merker in the shadow stack */

s/merker/marker/

Otherwise:

Reviewed-by: Catalin Marinas <catalin.marinas@....com>