Date: Wed, 4 Jan 2017 20:47:07 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: Matthew Garrett <mjg59@...eos.com> Cc: Kees Cook <keescook@...omium.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, "Rafael J. Wysocki" <rjw@...ysocki.net>, Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>, Ulf Hansson <ulf.hansson@...aro.org>, Mauro Carvalho Chehab <mchehab@...nel.org>, Tomeu Vizoso <tomeu.vizoso@...labora.com>, Lukas Wunner <lukas@...ner.de>, Madalin Bucur <madalin.bucur@....com>, Sudip Mukherjee <sudipm.mukherjee@...il.com>, Rasmus Villemoes <linux@...musvillemoes.dk>, Arnd Bergmann <arnd@...db.de>, Andrew Morton <akpm@...ux-foundation.org>, Russell King <rmk+kernel@....linux.org.uk>, Petr Tesarik <ptesarik@...e.com>, linux-pm@...r.kernel.org, kernel-hardening@...ts.openwall.com Subject: Re: [PATCH] Allow userspace control of runtime disabling/enabling of driver probing On Wed, Jan 04, 2017 at 12:31:45PM -0600, Matthew Garrett wrote: > On Wed, Jan 4, 2017 at 12:10 PM, Matthew Garrett <mjg59@...eos.com> wrote: > > > > The USB authentication feature was intended for handling wireless USB > > devices - it can be reused for this, but the code isn't generic enough > > to apply to other bus types. The two interact in exactly the way you'd > > expect, ie they don't. If you use both, then you need to handle both. > > And as an example of why the USB authorisation feature isn't > sufficient - the interface configuration isn't picked until after > you've authorised the device, which means you can't necessarily tell > the difference between a keyboard and an ethernet adapter until after > you've authorised it. 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 :) > That defeats the object, but it can't be changed without breaking the > wireless USB case. No one has wireless USB devices, this all works the same for any USB device :) thanks, greg k-h
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