There is Argos[0] which is a research project at my university, it's a qemu-based emulator that tracks tainted data coming from the network and other compromised sources and makes sure it doesn't tamper with memory or filesystem locations than it shouldn't. It's a bit overkill,especially for this, but it's interesting to check out :)

[0] http://www.few.vu.nl/argos/?page=1