/usr/share/texmf-texlive/metapost/support/charlib/ff is in texlive-metapost 2009-15.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | % $Id: ff,v 1.2 2004/09/19 21:47:11 karl Exp $
% Public domain.
vardef C.ff(expr n) =
save p;
picture p; p="f"infont n;
addto p also "f"infont n shifted(xpart urcorner p-fontsize n/20,0);
p enddef;
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