No longer necessary at
2017-09-23 /pub/FreeBSD/development/CTM/src-cur/src-cur.13188.gz

# http://www.berklix.com/~jhs//src/bsd/fixes/FreeBSD/src/gen/sys/dev/usb/usb_hub.c.REL=ALL.diff
# by Julian H. Stacey
# Contributed via	http://bugs.freebsd.org/bugzilla/enter_bug.cgi
# As			http://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222505
#
# Extends description of sysctl hw.usb.disable_enumeration
# makes it findable with "sysctl -a -d | grep -i usb | grep secur"
#
# Origin Of This Sysctl:
#   http://lists.freebsd.org/pipermail/freebsd-usb/2014-October/013304.html
#   http://lists.freebsd.org/pipermail/freebsd-security/2014-October/007976.html

# Patch Review & Ideas For More Later:
#   http://lists.freebsd.org/pipermail/freebsd-usb/2017-September/014939.html
#   http://lists.freebsd.org/pipermail/freebsd-security/2017-September/009410.html

*** 12.0-CURRENT-2017-09-15/src/sys/dev/usb/usb_hub.c.~1~	Mon Sep 18 23:52:26 2017
--- new-generic/src/sys/dev/usb/usb_hub.c	Thu Sep 21 23:19:47 CEST 2017
***************
*** 100,106 ****
  #if USB_HAVE_DISABLE_ENUM
  static int usb_disable_enumeration = 0;
  SYSCTL_INT(_hw_usb, OID_AUTO, disable_enumeration, CTLFLAG_RWTUN,
!     &usb_disable_enumeration, 0, "Set to disable all USB device enumeration.");
  
  static int usb_disable_port_power = 0;
  SYSCTL_INT(_hw_usb, OID_AUTO, disable_port_power, CTLFLAG_RWTUN,
--- 100,108 ----
  #if USB_HAVE_DISABLE_ENUM
  static int usb_disable_enumeration = 0;
  SYSCTL_INT(_hw_usb, OID_AUTO, disable_enumeration, CTLFLAG_RWTUN,
!     &usb_disable_enumeration, 0, "Set to disable all USB device enumeration"
! 	" (secure against devices that later turn evil,"
! 	" eg also declaring themselves a keyboard).");
  
  static int usb_disable_port_power = 0;
  SYSCTL_INT(_hw_usb, OID_AUTO, disable_port_power, CTLFLAG_RWTUN,