as discussed here some days ago, copy_to_user() returns the number of bytes
left uncopied.
Does copy_from_user() also return the number of uncopied bytes?
(Sorry, as I'm not familar with i386 assembly code, I wasn't able to figure
this out on my own).
When I watched out for some buggy `return copy_to_user()` statements
I noticed that there were lots of similar `return copy_from_user()`
statements as well.
Henner