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FreeBSD's libusb has three components: libusb01, libusb10, and libusb20.
libusb20 handles communication with character devices. We now requires a
backend context for libusb20. The backend context contains contains the
capsicumized usbctrl fd and usb directory (/dev/usb) fd so that the
library user can enter the capiblity mode safely while using libusb.
libusb10 is updated to support capabilities via a context option. Since
libusb allows general read/write access, we preserve all possible
capabilities when passing backend context to libusb20. It is the
responsibility of the libusb user to call cap_enter() at an appropriate
time.
All base system tools using libusb and libusb20 have been updated to
support Capsicum.
Reviewed by: adrian, markj
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D51865
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