The patch below improves the security of the game atc(6), by having it

The patch below improves the security of the game atc(6), by having it
open the score file at the start and then drop all setgid privileges
while keeping a (close-on-exec) file descriptor open to it.  In order
to allow this the static data files have to be made world readable.
In addition a potential buffer overrun with corrupted score files is
avoided by more careful use of scanf (note that SCORE_SCANF_FMT is
defined alongside the definition of the relevant structure).

Submitted in PR 8015 by Joseph Myers <jsm28@cam.ac.uk>