Malaysian Transit in GuangZhou, Need Visa?

Hi, I'm a Malaysian holding Malaysia passport and I will transit at the Baiyun Airport (CAN) to go to USA. The time of transit is 17 hours until my next flight. May I know do I need to apply for the entry permit? and if I do, where can I apply for it? If I didn't get it does it mean that I can't get out from airport during the transit?