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Message-ID: <CABtNtWEJEKgPLcAJ_fURVS1GSSNyzzLWp5d2egYWMn4Kc7DATQ@mail.gmail.com>
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/
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