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| author | MarcoFalke <falke.marco@gmail.com> | 2019-01-25 18:35:36 -0500 |
|---|---|---|
| committer | MarcoFalke <falke.marco@gmail.com> | 2019-01-29 19:03:06 -0500 |
| commit | 2ca632e5b44a8385989c8539cc4e30e60fdee16c (patch) | |
| tree | 86483d6d393f2e883114fa199914123a72232945 /doc/fuzzing.md | |
| parent | fab4bed68a3964ace5620a25d32d62ed87003126 (diff) | |
test: Build fuzz targets into seperate executables
Diffstat (limited to 'doc/fuzzing.md')
| -rw-r--r-- | doc/fuzzing.md | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/doc/fuzzing.md b/doc/fuzzing.md index 23317e938e..08b73d3b3c 100644 --- a/doc/fuzzing.md +++ b/doc/fuzzing.md @@ -1,9 +1,9 @@ Fuzz-testing Bitcoin Core ========================== -A special test harness `test_bitcoin_fuzzy` is provided to provide an easy -entry point for fuzzers and the like. In this document we'll describe how to -use it with AFL and libFuzzer. +A special test harness in `src/test/fuzz/` is provided for each fuzz target to +provide an easy entry point for fuzzers and the like. In this document we'll +describe how to use it with AFL and libFuzzer. ## AFL @@ -23,10 +23,10 @@ export AFLPATH=$PWD To build Bitcoin Core using AFL instrumentation (this assumes that the `AFLPATH` was set as above): ``` -./configure --disable-ccache --disable-shared --enable-tests CC=${AFLPATH}/afl-gcc CXX=${AFLPATH}/afl-g++ +./configure --disable-ccache --disable-shared --enable-tests --enable-fuzz CC=${AFLPATH}/afl-gcc CXX=${AFLPATH}/afl-g++ export AFL_HARDEN=1 cd src/ -make test/test_bitcoin_fuzzy +make ``` We disable ccache because we don't want to pollute the ccache with instrumented objects, and similarly don't want to use non-instrumented cached objects linked @@ -35,7 +35,7 @@ in. The fuzzing can be sped up significantly (~200x) by using `afl-clang-fast` and `afl-clang-fast++` in place of `afl-gcc` and `afl-g++` when compiling. When compiling using `afl-clang-fast`/`afl-clang-fast++` the resulting -`test_bitcoin_fuzzy` binary will be instrumented in such a way that the AFL +binary will be instrumented in such a way that the AFL features "persistent mode" and "deferred forkserver" can be used. See https://github.com/mcarpenter/afl/tree/master/llvm_mode for details. @@ -63,7 +63,7 @@ Extract these (or other starting inputs) into the `inputs` directory before star To start the actual fuzzing use: ``` -$AFLPATH/afl-fuzz -i ${AFLIN} -o ${AFLOUT} -m52 -- test/test_bitcoin_fuzzy +$AFLPATH/afl-fuzz -i ${AFLIN} -o ${AFLOUT} -m52 -- test/fuzz/fuzz_target_foo ``` You may have to change a few kernel parameters to test optimally - `afl-fuzz` @@ -77,7 +77,7 @@ found in the `compiler-rt` runtime libraries package). To build the `test/test_bitcoin_fuzzy` executable run ``` -./configure --disable-ccache --with-sanitizers=fuzzer,address CC=clang CXX=clang++ +./configure --disable-ccache --enable-fuzz --with-sanitizers=fuzzer,address CC=clang CXX=clang++ make ``` |