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Andrew Bartlett 5eac5813cc lib/fuzzing and librpc: Do not generate fuzzers for pointless targets 
We need to focus the fuzzing effort on reachable code, and these IDL
are just historical artifacts, many are entirely [todo] and have
no samba client nor server.

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
2019-12-18 06:39:26 +00:00
..
oss-fuzz lib/fuzzer: Allow coverage build for oss-fuzz 2019-12-18 06:39:26 +00:00
afl-fuzz-main.c lib/fuzzing: Allow load of fuzz inputs as files on the command line 2019-12-18 06:39:26 +00:00
decode_ndr_X_crash fuzz/decode_ndr_X_crash: -f to filter crashes by regex 2019-12-10 07:50:29 +00:00
fuzz_ldap_decode.c Add fuzzing binary for ldap_decode 2019-10-18 07:31:45 +00:00
fuzz_ldb_parse_tree.c lib/fuzzing: Fix argument order to ldb_filter_from_tree in fuzz_ldb_parse_tree 2019-12-11 04:21:28 +00:00
fuzz_lzxpress.c Add fuzzing binary for lzxpress 2019-10-18 07:31:45 +00:00
fuzz_ndr_X.c lib/fuzzing: Initialise st buffer in fuzz_ndr_X 2019-12-18 06:39:26 +00:00
fuzz_oLschema2ldif.c lib/fuzzing: Avoid NULL pointer de-ref from 0-length input 2019-11-18 19:39:30 +00:00
fuzz_reg_parse.c lib/fuzzing: Tell the compiler we know we are ignoring errors in fuzz_reg_parse 2019-12-10 07:50:28 +00:00
fuzz_regfio.c Add fuzzing binary for regfio 2019-10-18 07:31:45 +00:00
fuzz_tiniparser.c lib/fuzzing: Free memory after successful load in fuzz_tiniparser 2019-11-18 21:02:52 +00:00
fuzzing.c Add fuzzing support to build system 2019-08-07 06:07:28 +00:00
fuzzing.h Add fuzzing support to build system 2019-08-07 06:07:28 +00:00
README.md lib/fuzzing: Add mode for the AFL fuzzer 2019-12-10 07:50:29 +00:00
wscript_build lib/fuzzing and librpc: Do not generate fuzzers for pointless targets 2019-12-18 06:39:26 +00:00

README.md

Fuzzing Samba

Fuzzing supplies valid, invalid, unexpected or random data as input to a piece of code. Instrumentation, usually compiler-implemented, is used to monitor for exceptions such as crashes, assertions or memory corruption.

See Wikipedia article on fuzzing for more information.

Hongfuzz

Configure with fuzzing

Example command line to build binaries for use with honggfuzz:

buildtools/bin/waf -C --without-gettext --enable-debug --enable-developer \
	--address-sanitizer --enable-libfuzzer --abi-check-disable \
	CC=.../honggfuzz/hfuzz_cc/hfuzz-clang configure \
	LINK_CC=.../honggfuzz/hfuzz_cc/hfuzz-clang

Fuzzing tiniparser

Example for fuzzing tiniparser using honggfuzz (see --help for more options):

buildtools/bin/waf --targets=fuzz_tiniparser build && \
.../honggfuzz/honggfuzz --sanitizers --timeout 3 --max_file_size 256 \
  --rlimit_rss 100 -f .../tiniparser-corpus -- bin/fuzz_tiniparser

AFL (american fuzzy lop)

Configure with fuzzing

Example command line to build binaries for use with afl

buildtools/bin/waf -C --without-gettext --enable-debug --enable-developer \
	--enable-afl-fuzzer --abi-check-disable \
	CC=afl-gcc configure

Fuzzing tiniparser

Example for fuzzing tiniparser using afl-fuzz (see --help for more options):

buildtools/bin/waf --targets=fuzz_tiniparser build && \
afl-fuzz -m 200 -i inputdir -o outputdir -- bin/fuzz_tiniparser

oss-fuzz

Samba can be fuzzed by Google's oss-fuzz system. Assuming you have an oss-fuzz checkout from https://github.com/google/oss-fuzz with Samba's metadata in projects/samba, the following guides will help:

Testing locally

https://google.github.io/oss-fuzz/getting-started/new-project-guide/#testing-locally

Debugging oss-fuzz

See https://google.github.io/oss-fuzz/advanced-topics/debugging/

Samba-specific hints

A typical debugging workflow is:

oss-fuzz$ python infra/helper.py shell samba git fetch $REMOTE $BRANCH git checkout FETCH_HEAD lib/fuzzing/oss-fuzz/build_image.sh compile

This will pull in any new Samba deps and build Samba's fuzzers.

vim: set sw=8 sts=8 ts=8 tw=79 :