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

[Masahiro Yamada <masahiroy@kernel.org>]

On Wed, Jul 9, 2025 at 12:08 AM Vlastimil Babka <vbabka@suse.cz> wrote:
>
> On 7/8/25 14:41, Masahiro Yamada wrote:
> > On Tue, Jul 8, 2025 at 4:29 PM Vlastimil Babka <vbabka@suse.cz> 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@suse.cz>
> >
> >
> >
> > In my understanding, an external module with the same name
> > can override the internal one.
> >
> > This change disallows such a use-case.
>
> Hmm I'm not familiar with this, but for such cases to be legitimate we can
> assume the external module has to be derived from the internal one and not
> something completely unrelated impersonating the internal one? So in that
> case just patch 2 alone would be sufficient and not break any legitimate use
> cases?
>

IIRC, nvdimm uses this feature for testing.


In-tree drivers:
  drivers/nvdimm/Makefile

Out-of-tree drivers:
  tools/testing/nvdimm/Makefile
  tools/testing/nvdimm/Kbuild




-- 
Best Regards
Masahiro Yamada