Date: Sun, 8 Mar 2015 00:22:13 +0800 From: Kai Zhao <loverszhao@...il.com> To: john-dev@...ts.openwall.com Subject: Re: Any advice on how to fuzz john jumbo by AFL > How much exec/sec do you get with unmodified/modified john in afl? How much total paths discovered? Both total execs and total paths are 41. I modified john by comment the function john_run() in "src/john.c" in order to just fuzz the john_init() function which involves format valid. On Sun, Mar 8, 2015 at 12:12 AM, Alexander Cherepanov <ch3root@...nwall.com> wrote: > On 2015-03-07 16:22, Kai Zhao wrote: > >> Hi, I fuzzed john jumbo two days but without find any crashes. The fuzz >> result indicates that john jumbo is robust or my fuzz test go somewhere >> wrong place. >> >> My fuzz testing steps as follows: >> >> 1. fuzz unshallow >> 1.1 fuzz time about 6 hours >> 1.2 no crash >> >> 2. fuzz john without any change >> 2.1 the input test is copy from the test cases in the >> src/*_fmt_plug.c >> 2.2 fuzz time about 20 hours >> 2.3 fuzz slow because the john try to crack the input files >> 2.4 no crash >> >> 3. fuzz john with change source code >> 3.1 I comment the line: john_run() in src/john.c in order to only >> test the >> john_init function which involves format valid >> 3.2 fuzz time about 6 hours >> 3.3 fuzz fast >> 3.4 no crash >> > > How much exec/sec do you get with unmodified/modified john in afl? How > much total paths discovered? > > Maybe you have some good advice on how to fuzz john. Thank you. >> > > There are some john options to play with, e.g. --max-run-time=N and > --skip-self-tests. Then there are some general things to try: build the > program with hardening, build 32-bit version, try AddressSanitizer (but > there are caveats -- see notes_for_asan.txt in afl) etc. > > As for code reviews, don't forget code analyzers, e.g. cppcheck, Clang > Static Analyzer. > > -- > Alexander Cherepanov > -- loverszhaokai motto：You got a dream and you gotta protect it. github：https://github.com/loverszhaokai blog：http://www.cnblogs.com/lovers/ Content of type "text/html" skipped
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