excerpt from texmf.cnf: ------------------------------------------------------------------------- % Do we allow TeX \input or \openin (openin_any), or \openout % (openout_any) on filenames starting with `.' (e.g., .rhosts) or % outside the current tree (e.g., /etc/passwd)? % a (any) : any file can be opened. % r (restricted) : disallow opening dot files % p (paranoid) : as `r' and disallow going to parent directories, and % restrict absolute paths to be under $TEXMFOUTPUT. openin_any = a ------------------------------------------------------------------------- Dear Sirs, when I set openin_any = p then fmtutil can't create any LuaTeX-based format files anymore: $ fmtutil --sys --all [...stuff omitted...] fmtutil [ERROR]: running `luatex -ini -jobname=luatex -progname=luatex luatex.ini