usb.rc does not correctly parse blacklist files in Ubuntu Breezy

[Cory Snider]

The maybe_modprobe function of /etc/hotplug/usb.rc does not match blacklisted
modules the same way as modprobe interprets modules.
usb.rc treats - and _ differently, while modprobe treats them as if they were
the same.

Steps to Reproduce:
1) Add a module to the blacklist with a - or _ in the name, switching a - for a
_ or vice versa depending on the way it was entered in usb.rc. i.e. putting
ehci_hcd into the blacklist file instead of ehci-hcd (which is how it is
represented in usb.rc)
2) Restart hotplug

Actual Results:
The module loads

Expected Results:
The module is not loaded

Fully-patched Ubuntu Breezy i386.
Bug may exist on other platforms and in other files with the maybe_modprobe
method copy+pasted.

[Scott James Remnant (Canonical) (canonical-scott)]

This is a breezy bug, and the infrastructure has changed completely in dapper --
we now use modprobe's native alias expansion and blacklist support to load modules.