Extract the part of the code that needs root privileges into a separate process. Make that taint-safe. Hopefully that's not very many lines but for sure it definitely isn't 50KLOC.

In reply to Re^3: suid, PAR:pp and disabling taint checks: pick any two of them by Anonymous Monk
in thread suid, PAR:pp and disabling taint checks: pick any two of them by azara

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