linux-kernel - Re: [PATCH v6 7/7] mseal, system mappings: update mseal.rst

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Message-ID: <rzhfepcwdwiq6khrepv7x7gpgynek4p54fhx4enqgyw7nubegc@uydhglfx67gp>
Date: Mon, 24 Feb 2025 15:26:32 -0500
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
To: jeffxu@...omium.org
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Subject: Re: [PATCH v6 7/7] mseal, system mappings: update mseal.rst

* jeffxu@...omium.org <jeffxu@...omium.org> [250224 12:45]:
> From: Jeff Xu <jeffxu@...omium.org>
> 
> Update memory sealing documentation to include details about system
> mappings.
> 
> Signed-off-by: Jeff Xu <jeffxu@...omium.org>
> ---
>  Documentation/userspace-api/mseal.rst | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/userspace-api/mseal.rst b/Documentation/userspace-api/mseal.rst
> index 41102f74c5e2..10147281bf2d 100644
> --- a/Documentation/userspace-api/mseal.rst
> +++ b/Documentation/userspace-api/mseal.rst
> @@ -130,6 +130,13 @@ Use cases
>  
>  - Chrome browser: protect some security sensitive data structures.

Did you mean to drop this line?

>  
> +- System mappings:
> +  If supported by an architecture (via CONFIG_ARCH_HAS_MSEAL_SYSTEM_MAPPINGS),
> +  the CONFIG_MSEAL_SYSTEM_MAPPINGS seals system mappings, e.g. vdso, vvar,
> +  uprobes, sigpage, vectors, etc. CHECKPOINT_RESTORE, UML, gVisor, rr are
> +  known to relocate or unmap system mapping, therefore this config can't be
> +  enabled universally.
> +
>  When not to use mseal
>  =====================
>  Applications can apply sealing to any virtual memory region from userspace,
> -- 
> 2.48.1.601.g30ceb7b040-goog
>