[ubuntu] Dual-Booting OSX/Ubuntu, Can't Access the OSX Drive

I'm on Ubuntu 14.04 on a Macbook (5,1), and I've created a 40GB partition for Ubuntu. I had planned to access the files from the OSX drive from within Ubuntu, but I don't have "the necessary permissions." Can anyone tell me how to grant myself permissions? I'd really just like access to my Documents and Movies folders.

Thanks!