This English sentence is ambiguous:
He ate his food.
The word his can refer to the He at the start, or another man.
In Spanish:
Él comió su comida.
Does the ambiguity still remain or does su always refer to the Él. If ambiguous, is this the proper way to resolve the ambiguity?:
Él comió su propia comida. (his own)
Él comió comida de otra persona. (someone else's)
EDIT - propio is now propia (thank you Javi)