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File OriginalPic	EditTime	Size
asn1.c	2024-07-14 16:19:20	6.67 KB
asn1.d	2024-07-14 16:19:20	821 B
asn1.o	2024-07-14 16:19:20	7.79 KB
asn1parse.c	2024-07-14 16:19:20	837 B
asn1parse.d	2024-07-14 16:19:20	713 B
asn1parse.o	2024-07-14 16:19:20	1.29 KB
asn1parse-test	2024-07-14 16:19:20	12.28 KB
asn1-test	2024-07-14 16:19:20	26.86 KB
bignum.c	2024-07-14 16:19:20	2.34 KB
bignum.d	2024-07-14 16:19:20	288 B
bignum.o	2024-07-14 16:19:20	2.89 KB
bignum-test	2024-07-14 16:19:20	14.07 KB
bndiv.c	2024-07-14 16:19:20	3.02 KB
bndiv.d	2024-07-14 16:19:20	286 B
bndiv.o	2024-07-14 16:19:20	3.45 KB
bndiv-test	2024-07-14 16:19:20	14.34 KB
build.info	2024-07-14 16:19:20	3.15 KB
cms.c	2024-07-14 16:19:20	837 B
cms.d	2024-07-14 16:19:20	720 B
cms.o	2024-07-14 16:19:20	1.44 KB
cms-test	2024-07-14 16:19:20	12.67 KB
conf.c	2024-07-14 16:19:20	853 B
conf.d	2024-07-14 16:19:20	335 B
conf.o	2024-07-14 16:19:20	1.48 KB
conf-test	2024-07-14 16:19:20	12.77 KB
crl.c	2024-07-14 16:19:20	891 B
crl.d	2024-07-14 16:19:20	647 B
crl.o	2024-07-14 16:19:20	1.38 KB
crl-test	2024-07-14 16:19:20	12.81 KB
ct.c	2024-07-14 16:19:20	1000 B
ct.d	2024-07-14 16:19:20	669 B
ct.o	2024-07-14 16:19:20	1.43 KB
ct-test	2024-07-14 16:19:20	12.82 KB
driver.c	2024-07-14 16:19:20	1.12 KB
fuzzer.h	2024-07-14 16:19:20	451 B
helper.py	2024-07-14 16:19:20	1.33 KB
README.md	2024-07-14 16:19:20	1.76 KB
server.c	2024-07-14 16:19:20	14.43 KB
server.d	2024-07-14 16:19:20	965 B
server.o	2024-07-14 16:19:20	4.75 KB
server-test	2024-07-14 16:19:20	16.57 KB
test-corpus.c	2024-07-14 16:19:20	2.53 KB
test-corpus.d	2024-07-14 16:19:20	302 B
test-corpus.o	2024-07-14 16:19:20	2.31 KB
x509.c	2024-07-14 16:19:20	952 B
x509.d	2024-07-14 16:19:20	649 B
x509.o	2024-07-14 16:19:20	1.37 KB
x509-test	2024-07-14 16:19:20	12.78 KB

# I Can Haz Fuzz?

LibFuzzer
=========

Or, how to fuzz OpenSSL with [libfuzzer](http://llvm.org/docs/LibFuzzer.html).

Starting from a vanilla+OpenSSH server Ubuntu install.

Use Chrome's handy recent build of clang. Older versions may also work.

$ sudo apt-get install git
    $ mkdir git-work
    $ git clone https://chromium.googlesource.com/chromium/src/tools/clang
    $ clang/scripts/update.py

You may want to git pull and re-run the update from time to time.

Update your path:

$ PATH=~/third_party/llvm-build/Release+Asserts/bin/:$PATH

Get and build libFuzzer (there is a git mirror at
https://github.com/llvm-mirror/llvm/tree/master/lib/Fuzzer if you prefer):

$ cd
    $ sudo apt-get install subversion
    $ mkdir svn-work
    $ cd svn-work
    $ svn co http://llvm.org/svn/llvm-project/llvm/trunk/lib/Fuzzer
    $ cd Fuzzer
    $ clang++ -c -g -O2 -std=c++11 *.cpp
    $ ar r libFuzzer.a *.o
    $ ranlib libFuzzer.a

Configure for fuzzing:

$ CC=clang ./config enable-fuzz-libfuzzer \
            --with-fuzzer-include=../../svn-work/Fuzzer \
            --with-fuzzer-lib=../../svn-work/Fuzzer/libFuzzer \
            -DPEDANTIC enable-asan enable-ubsan no-shared
    $ sudo apt-get install make
    $ LDCMD=clang++ make -j
    $ fuzz/helper.py $FUZZER

Where $FUZZER is one of the executables in `fuzz/`.

If you get a crash, you should find a corresponding input file in
`fuzz/corpora/$FUZZER-crash/`. You can reproduce the crash with

$ fuzz/$FUZZER <crashfile>

AFL
===

Configure for fuzzing:

$ sudo apt-get install afl-clang
    $ CC=afl-clang-fast ./config enable-fuzz-afl no-shared
    $ make

Run one of the fuzzers:

$ afl-fuzz -i fuzz/corpora/$FUZZER -o fuzz/corpora/$FUZZER/out fuzz/$FUZZER

Where $FUZZER is one of the executables in `fuzz/`.

2025-08-29 16:39:15 Friday 216.73.216.167 Runningtime:0.105s Mem:1.61 MB