Yes, after much speculations Variety has confirmed it. And to quote Variety, here is the synopsis of the film.
After his right forearm got pinned for nearly five days under a boulder during a climb in Utah in May, 2003, Ralston used a dull knife to amputate the limb. He then scaled a 65-foot sheer wall and hiked out before running into a family that gave him water and food. He was finally rescued by helicopter.
And if the synopsis doesnt excite you, check out the video. The amazing story of mountain climber Aron Ralston, in his own words.
F.i.g.h.t C.l.u.b 