From: utzoo!henry
Newsgroups: net.bugs.v7
Title: sort tempfile permissions 
Article-I.D.: utzoo.2043
Posted: Fri May 14 00:19:55 1982
Received: Fri May 14 00:19:55 1982

The sort(1) program carefully makes its first tempfile mode 0600, but
then fopen(...,"w")'s the rest without bothering to make them private.
This is a bit inappropriate when the user may be sorting confidential
data.  The fix is easy;  in sort.c/newfile(), just before "nfiles++;",
add this line:
		chmod(f, 0600);