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Date: Wed, 4 Jan 2017 21:47:04 +0100
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Matthew Garrett <mjg59@coreos.com>
Cc: Kees Cook <keescook@chromium.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
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Subject: Re: [PATCH] Allow userspace control of runtime disabling/enabling of
 driver probing
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On Wed, Jan 04, 2017 at 02:01:00PM -0600, Matthew Garrett wrote:
> On Wed, Jan 4, 2017 at 1:47 PM, Greg Kroah-Hartman
> <gregkh@linuxfoundation.org> wrote:
> > You know the device type and vendor/product id before you authorize it,
> > you should be able to do this type of detection otherwise it seems
> > pretty pointless :)
> 
> You know the vendor and product ID, which doesn't tell you whether one
> of the endpoints is a network device or a keyboard. You need to know
> that.

Are you sure you don't have the configuration information as well?  That
should tell you...

And for network devices, they are almost all just vendor/product ids,
not many use the class protocol.

thanks,

greg k-h