linux-kernel - Re: [PATCH v5 1/1] usb: gadget: add raw-gadget interface

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Date:   Wed, 22 Jan 2020 15:50:12 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Felipe Balbi <balbi@...nel.org>, Jonathan Corbet <corbet@....net>,
        Alan Stern <stern@...land.harvard.edu>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        USB list <linux-usb@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 1/1] usb: gadget: add raw-gadget interface

On Wed, Jan 22, 2020 at 03:37:46PM +0100, Andrey Konovalov wrote:
> On Tue, Jan 14, 2020 at 2:24 PM Andrey Konovalov <andreyknvl@...gle.com> wrote:
> >
> > USB Raw Gadget is a kernel module that provides a userspace interface for
> > the USB Gadget subsystem. Essentially it allows to emulate USB devices
> > from userspace. Enabled with CONFIG_USB_RAW_GADGET. Raw Gadget is
> > currently a strictly debugging feature and shouldn't be used in
> > production.
> >
> > Raw Gadget is similar to GadgetFS, but provides a more low-level and
> > direct access to the USB Gadget layer for the userspace. The key
> > differences are:
> >
> > 1. Every USB request is passed to the userspace to get a response, while
> >    GadgetFS responds to some USB requests internally based on the provided
> >    descriptors. However note, that the UDC driver might respond to some
> >    requests on its own and never forward them to the Gadget layer.
> >
> > 2. GadgetFS performs some sanity checks on the provided USB descriptors,
> >    while Raw Gadget allows you to provide arbitrary data as responses to
> >    USB requests.
> >
> > 3. Raw Gadget provides a way to select a UDC device/driver to bind to,
> >    while GadgetFS currently binds to the first available UDC.
> >
> > 4. Raw Gadget uses predictable endpoint names (handles) across different
> >    UDCs (as long as UDCs have enough endpoints of each required transfer
> >    type).
> >
> > 5. Raw Gadget has ioctl-based interface instead of a filesystem-based one.
> >
> > Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
> > ---
> >
> > Greg, I've assumed your LGTM meant that I can add a Reviewed-by from you.
> >
> > Felipe, looking forward to your review, thanks!
> 
> Hi Greg and Felipe,
> 
> I was wondering if it's feasible to get this reviewed and merged
> during the upcoming merge window? This patch is the only piece missing
> to enable USB fuzzing for Android common kernels on syzbot.

No objection from me, if Felipe acks it I can take it...

thanks,

greg k-h