Code coverage is one of the most important parameters for achieving robust software testing and design, however achieving the same is almost impossible given the limitations in testing scenarios. One such scenario is simulating environment faults for the application under test. In this report we present a prototype implementation of Coverage Based Fault Injection (CBFI)[7], to test programs for errors caused due to faulty or malicious underlying hardware, operating system and other related components. In this approach CBFI[7] is implemented as a coverage based fuzzer with dynamically linked library that wraps around existing GNU libc calls and permutes fault injections to fail a set of libc calls and test the program robustness as well as susceptibility to vulnerabilities due to unhandled exceptions or crashes at runtime. Our work is inspired and extends the previous work on fault injections, specifically that presented in Vulnerability Testing of Software System Using Fault Injection[1] and Libfaultinj[2].
Compiling wrapper:
(1) cd wrapper/
(2) make clean all
Compiling test programs:
(1) cd tests/
(2) make clean all
Running a test program:
OPEN_FAIL=1,2 LD_PRELOAD=../wrapper/wraplib.so ./testprogram
Running Python Fuzzer:
(1) cd python-wrappper/
(1) Create a config file based on sample config JSON
(2) Run python python-wrapper.py configfilename
(3) Report would be generated on the same folder