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
