Running an android exploit on Emulator

Question

I want to run this exploit cve-2014-7920-7921(from here) on Emulator. I am new to Android and after searching on google I did like this: I compiled android source code 4.3 and then run the build.sh script of this exploit. It is compiled successfully and after runing emulator I can see that it is working with the android source which I compiled. But I don't know how I can figure out that this exploit has run and worked! It has several printf in its code that I think they print to /dev/null so I put some logs using __android_log_write(ANDROID_LOG_INFO, "mytag", "Helllllooooooooooo\n"); and used Dalvik Debug Monitor(ddms) to show the logs. But this log didn't appear. On the other hand I heard that security patches are already applied even to these old patches, so I'm in doubt that this exploit cannot work for this reason or I haven't set up the log properly.