If the kernel image gets too big, "cmp ebx, KERNEL_LOAD_PAGES*8 + 1"
[pintos-anon] / grading / userprog / open-bad-ptr.exp
1 (open-bad-ptr) begin
2 (open-bad-ptr) end
3 open-bad-ptr: exit(0)
4 --OR--
5 (open-bad-ptr) begin
6 open-bad-ptr: exit(-1)