Code injection

The 1 mypopenvimpl and 2 myspawnv functions in src/condorutils/mypopen.cpp and the 3 systemCommand function in condorvm-gahp/vmgahpcommon.cpp in Condor 7.6.x before 7.6.10 and 7.8.x before 7.8.4 does not properly check the return value of setuid calls, which might cause a subprocess to be created...