linux-kernel - Re: [PATCH v4 0/1] usb: gadget: add raw-gadget interface

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Date:   Wed, 8 Jan 2020 21:15:20 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     USB list <linux-usb@...r.kernel.org>,
        LKML <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>
Subject: Re: [PATCH v4 0/1] usb: gadget: add raw-gadget interface

On Wed, Dec 18, 2019 at 8:27 PM Andrey Konovalov <andreyknvl@...gle.com> wrote:
>
> 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

Hi Greg,

Just an after holidays reminder that I've sent v4 of this patchset and
looking forward to a review.

Thanks!

>
> Changes v3 -> v4:
> - Print debug message when maxpacket check fails.
> - Use module_misc_device() instead of module_init/exit().
> - Reuse DRIVER_NAME macro in raw_device struct definition.
> - Don't print WARNING in raw_release().
> - Add comment that explains locking into raw_event_queue_fetch().
> - Print a WARNING when event queue size is exceeded.
> - Rename raw.c to raw_gadget.c.
> - Mention module name in Kconfig.
> - Reworked logging to use dev_err/dbg() instead of pr_err/debug().
>
> Changes v2 -> v3:
> - Updated device path in documentation.
> - Changed usb_raw_init struct layout to make it the same for 32 bit compat
>   mode.
> - Added compat_ioctl to raw_fops.
> - Changed raw_ioctl_init() to return EINVAL for invalid USB speeds, except
>   for USB_SPEED_UNKNOWN, which defaults to USB_SPEED_HIGH.
> - Reject endpoints with maxpacket = 0 in raw_ioctl_ep_enable().
>
> Changes v1 -> v2:
> - Moved raw.c to legacy/.
> - Changed uapi header to use __u* types.
> - Switched from debugfs entry to a misc device.
> - Changed raw_dev from refcount to kref.
> - Moved UDC_NAME_LENGTH_MAX to uapi headers.
> - Used usb_endpoint_type() and usb_endpoint_dir_in/out() functions instead
>   of open coding them.
> - Added "WITH Linux-syscall-note" to SPDX id in the uapi header.
> - Removed pr_err() if case dev_new() fails.
> - Reduced the number of debugging messages.
>
> Andrey Konovalov (1):
>   usb: gadget: add raw-gadget interface
>
>  Documentation/usb/index.rst            |    1 +
>  Documentation/usb/raw-gadget.rst       |   59 ++
>  drivers/usb/gadget/legacy/Kconfig      |   11 +
>  drivers/usb/gadget/legacy/Makefile     |    1 +
>  drivers/usb/gadget/legacy/raw_gadget.c | 1071 ++++++++++++++++++++++++
>  include/uapi/linux/usb/raw_gadget.h    |  167 ++++
>  6 files changed, 1310 insertions(+)
>  create mode 100644 Documentation/usb/raw-gadget.rst
>  create mode 100644 drivers/usb/gadget/legacy/raw_gadget.c
>  create mode 100644 include/uapi/linux/usb/raw_gadget.h
>
> --
> 2.24.1.735.g03f4e72817-goog
>