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Joachim Wiberg
937d4c38c7
Use kernel cmdline option 'usbcore.authorized_default=2' to lock all
external/user-visible USB ports by default.
The kernel distinguishes internal vs external USB ports using ACPI
methods (_UPC and _PLD) on x86/x86_64 systems. On ACPI systems, ports
marked as non-visible but connectable are considered internal (e.g.,
hard-wired USB-to-Ethernet adapters) and are automatically authorized,
while user-visible external ports require manual authorization.
However, on device tree systems the kernel lacks a standard mechanism
for identifying internal ports. The 'authorized_default=2' setting falls
back to requiring authorization for all devices on these platforms,
We list user-accessible USB ports in the device tree ('usb-ports' and
'usb-port-names'), with unlisted ports being implicitly internal and
managed separately.
Fixes #1065
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>