On Mon, Jul 31, 2023 at 10:38:06AM +0200, Christoph Hellwig wrote:

It has recently come to my attention that nvidia is circumventing the
protection added in 262e6ae7081d ("modules: inherit
TAINT_PROPRIETARY_MODULE") by importing exports from their propriertary
modules into an allegedly GPL licensed module and then rexporting them.

Given that symbol_get was only ever inteded for tightly cooperating
modules using very internal symbols it is logical to restrict it to
being used on EXPORY_SYMBOL_GPL and prevent nvidia from costly DMCA

"EXPORT"  :)

circumvention of access controls law suites.

All symbols except for four used through symbol_get were already exported
as EXPORT_SYMBOL_GPL, and the remaining four ones were switched over in
the preparation patches.

Fixes: 262e6ae7081d ("modules: inherit TAINT_PROPRIETARY_MODULE")
Signed-off-by: Christoph Hellwig <hch@lst.de>

Thanks for fixing this hole up, it's much needed.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>