linux-kernel - [PATCH 0/1] usb: gadget: add raw-gadget interface

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Date:   Fri,  8 Nov 2019 19:26:54 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>
Cc:     Jonathan Corbet <corbet@....net>, Felipe Balbi <balbi@...nel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH 0/1] usb: gadget: add raw-gadget interface

This patchset (currently a single patch) adds a new userspace interface
for the USB Gadget subsystem called USB Raw Gadget (I don't mind changing
the name to something else if there are better ideas). This is what
currently being used to enable coverage-buided USB fuzzing with syzkaller:

https://github.com/google/syzkaller/blob/master/docs/linux/external_fuzzing_usb.md

Initially I was using GadgetFS (together with the Dummy HCD/UDC module)
to perform emulation of USB devices for fuzzing, but later switched to a
custom written interface. The incentive to implement a different interface
was to provide a somewhat raw and direct access to the USB Gadget layer
for the userspace, where every USB request is passed to the userspace to
get a response. See documentation for the list of differences between
Raw Gadget and GadgetFS.

This patchset has been pushed to the public Linux kernel Gerrit instance:

https://linux-review.googlesource.com/c/linux/kernel/git/torvalds/linux/+/2144

Andrey Konovalov (1):
  usb: gadget: add raw-gadget interface

 Documentation/usb/index.rst         |    1 +
 Documentation/usb/raw-gadget.rst    |   60 ++
 drivers/usb/gadget/Kconfig          |    9 +
 drivers/usb/gadget/Makefile         |    2 +
 drivers/usb/gadget/raw.c            | 1150 +++++++++++++++++++++++++++
 include/uapi/linux/usb/raw_gadget.h |  164 ++++
 6 files changed, 1386 insertions(+)
 create mode 100644 Documentation/usb/raw-gadget.rst
 create mode 100644 drivers/usb/gadget/raw.c
 create mode 100644 include/uapi/linux/usb/raw_gadget.h

-- 
2.24.0.rc1.363.gb1bccd3e3d-goog