Peter Münster wrote:
> Hello,
> 
> What directories in luatex-cache should be world writable?
> It seems to me, at least some sub-dirs in
> $TEXMFCACHE/luatex-cache/context/XXX/fonts

the whole cache

> And do these world writable directories present any security risk?
> (For example: user A writes some evil code into file
> $TEXMFCACHE/luatex-cache/context/XXX/fonts/otf/file.otf that makes user B
> remove all his files when running "texexec --luatex document.tex")

you can use a cache in your home path and make that country or city 
writable

Hans


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