* Loïc Minier:

>         if [ ! -d "debsign.$$" ]
>         then
>             mkdir debsign.$$ || { echo "$PROGNAME: Can't mkdir!" >&2; exit 1; 
> }
>         fi
>         trap "cleanup_tmpdir" 0 1 2 3 7 10 13 15
>         cd debsign.$$

AFAIK, this is only exploitable if you mount TMPDIR (or /tmp) over
NFS.




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