Try running any such program through Softbound + CETS or SAFEcode (already in LLVM). They turn C programs memory-safe. Should knock out most of your risk immediately with an acceptable performance hit unless your volume is really, really high. Code-Pointer Integrity at least protects control flow with max of around 10% penalty. Given they're all alpha by few developers, they need more people using them on various software and doing error reports if they fail.