Im not to sure if you want to do such a thing, i dont know how that will effect your partition,
but i know how to set permissions and ownership...
chmod - is to change permissions, 4 is read, 2 write, 1 execute.
so, there are three parts to it, chmod owner, group, everyone i think
so if you want to give full ownership to everyone you add the numbers...
so chmod 777 filename
its kind of werid, but simple to figure out and remember, do a google serach
and you'll find a better example.
You can also change ownership, chown filename, but once again i dont know
if you want to do this to a windows partition