49a0f6170b
The /etc/default/locale file does not exists in the rpm family distros so the do_build.sh script failed with: ./lib/fuzzing/oss-fuzz/do_build.sh: line 31: /etc/default/locale: No such file or directory Signed-off-by: Samuel Cabrero <scabrero@samba.org> Reviewed-by: David Mulder <dmulder@samba.org> Autobuild-User(master): Samuel Cabrero <scabrero@samba.org> Autobuild-Date(master): Tue Apr 6 15:54:54 UTC 2021 on sn-devel-184
Fuzzing Samba
See also https://wiki.samba.org/index.php/Fuzzing
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.
Honggfuzz
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.