To try this out:
"...Save anything you’re working on (this will reboot your phone!), open the keyboard tray on your G1, ignore anything you see on the screen, and type these 8 keystrokes: <return>-r-e-b-o-o-t-<return>. Poof, your phone will reboot. This only works on a real phone, not in the emulator, and only with firmware version 1.0 TC4-RC29 and earlier.
From the home screen select Menu > Settings > About phone, and look for the Build number (near the bottom). If you see this...
kila-user 1.0 TC4-RC29 115247 ota-rel-keys,release-keys
then you’re vulnerable. If you see anything later than RC29 then you already have the fix."