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

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Message-ID: <CAAeHK+xJ_Xhy96vVXQLk2G_DqVtjh+3ivNM=yFVXFPBjZ6P3iA@mail.gmail.com>
Date:   Mon, 27 Jan 2020 13:27:57 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Felipe Balbi <balbi@...nel.org>
Cc:     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>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v5 1/1] usb: gadget: add raw-gadget interface

On Wed, Jan 22, 2020 at 3:50 PM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> 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...

Hi Felipe,

Any idea if you'll be able to look at this?

Thanks!