This is an update from rotoworld.com

Marion Barber is active for Sunday Night Football against the Giants.

There are strong indications his role will be limited and he's no sure bet to make it through many plays. The Cowboys' inactives are CB Adam Jones, S Courtney Brown, RB Alonzo Coleman, LB Steve Octavien, G Montrae Holland, G Joe Berger, third QB Brooks Bollinger, and WR Isaiah Stanback. Miles Austin returns and will likely return kicks. Dec. 14 - 6:59 pm et