linux-kernel - Re: [PATCH 1/2] module: Restrict module namespace access to in-tree modules

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Message-ID: <aG1v5v0cIy5X70UD@fjasle.eu>
Date: Tue, 8 Jul 2025 21:22:14 +0200
From: Nicolas Schier <nicolas@...sle.eu>
To: Vlastimil Babka <vbabka@...e.cz>
Cc: Matthias Maennich <maennich@...gle.com>, Jonathan Corbet <corbet@....net>,
 Luis Chamberlain <mcgrof@...nel.org>, Petr Pavlu <petr.pavlu@...e.com>,
 Sami Tolvanen <samitolvanen@...gle.com>,
 Daniel Gomez <da.gomez@...sung.com>,
 Masahiro Yamada <masahiroy@...nel.org>,
 Nathan Chancellor <nathan@...nel.org>,
 Nicolas Schier <nicolas.schier@...ux.dev>,
 Alexander Viro <viro@...iv.linux.org.uk>,
 Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
 Christoph Hellwig <hch@...radead.org>,
 Peter Zijlstra <peterz@...radead.org>,
 David Hildenbrand <david@...hat.com>, Shivank Garg <shivankg@....com>,
 "Jiri Slaby (SUSE)" <jirislaby@...nel.org>,
 Stephen Rothwell <sfr@...b.auug.org.au>, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-modules@...r.kernel.org,
 linux-kbuild@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 1/2] module: Restrict module namespace access to in-tree
 modules

On Tue, Jul 08, 2025 at 09:28:57AM +0200 Vlastimil Babka wrote:
> The module namespace support has been introduced to allow restricting
> exports to specific modules only, and intended for in-tree modules such
> as kvm. Make this intention explicit by disallowing out of tree modules
> both for the module loader and modpost.
> 
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
> ---
>  Documentation/core-api/symbol-namespaces.rst | 5 +++--
>  kernel/module/main.c                         | 3 ++-
>  scripts/mod/modpost.c                        | 6 +++++-
>  3 files changed, 10 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/core-api/symbol-namespaces.rst b/Documentation/core-api/symbol-namespaces.rst
> index 32fc73dc5529e8844c2ce2580987155bcd13cd09..dc228ac738a5cdc49cc736c29170ca96df6a28dc 100644
> --- a/Documentation/core-api/symbol-namespaces.rst
> +++ b/Documentation/core-api/symbol-namespaces.rst
> @@ -83,13 +83,14 @@ Symbols exported using this macro are put into a module namespace. This
>  namespace cannot be imported.
>  
>  The macro takes a comma separated list of module names, allowing only those
> -modules to access this symbol. Simple tail-globs are supported.
> +modules to access this symbol. The access is restricted to in-tree modules.
> +Simple tail-globs are supported.
>  
>  For example::
>  
>    EXPORT_SYMBOL_GPL_FOR_MODULES(preempt_notifier_inc, "kvm,kvm-*")
>  
> -will limit usage of this symbol to modules whoes name matches the given
> +will limit usage of this symbol to in-tree modules whoes name matches the given

If you keep touching this line, might you fix the typo?

s/whoes/whose/

Kind regards,
Nicolas