LSM root_plug module questions

Hi,

I'm currently playing around with the security/root_plug.c LSM module and I have two questions:

1) What's the recommended way of telling that someone is logging in to the computer (via ssh, virtual console, serial console, X, whatever) with LSM? Look for open() on /dev/pts?

2) root_plug currently scans the usb device tree looking for the appropriate device each time it's needed. In the interest of making the result of the lookup cached, it is possible for a module to register so that it is notified when a usb device is added/removed?

Regards,
David

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