On Wed, Nov 29, 2017 at 10:46 AM, Linus Torvalds
[off-list ref] wrote:

So the module flag is technically easy to add, and it's technically
easy to read at module loading time, but I suspect that it's actually
annoyingly hard to pass the original request_module() capability
information around to where we actually read the module.

One possibly interesting approach would be to run the usermode helper
not as root, but with the credentials of the request_module() caller.

That's arguably the right thing to do (in that request_module() would
never do anything that the user wouldn't be able to do on their own)
and probably what we should have done originally, but while it feels
like a nice solution I suspect it would break pretty much every distro
out there.

Because they all expect modprobe/kmod to be called as root in the
original init-namespace.

                 Linus
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