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diff --git a/doc/fuzzing.md b/doc/fuzzing.md index ee9c65d4d4..0880f9f581 100644 --- a/doc/fuzzing.md +++ b/doc/fuzzing.md @@ -254,6 +254,73 @@ $ honggfuzz/honggfuzz --exit_upon_crash --quiet --timeout 4 -n 1 -Q \ -debug ``` +# Fuzzing Bitcoin Core using Eclipser (v1.x) + +## Quickstart guide + +To quickly get started fuzzing Bitcoin Core using [Eclipser v1.x](https://github.com/SoftSec-KAIST/Eclipser/tree/v1.x): + +```sh +$ git clone https://github.com/bitcoin/bitcoin +$ cd bitcoin/ +$ sudo vim /etc/apt/sources.list # Uncomment the lines starting with 'deb-src'. +$ sudo apt-get update +$ sudo apt-get build-dep qemu +$ sudo apt-get install libtool libtool-bin wget automake autoconf bison gdb +``` + +At this point, you must install the .NET core. The process differs, depending on your Linux distribution. +See [this link](https://docs.microsoft.com/en-us/dotnet/core/install/linux) for details. +On ubuntu 20.04, the following should work: + +```sh +$ wget -q https://packages.microsoft.com/config/ubuntu/20.04/packages-microsoft-prod.deb +$ sudo dpkg -i packages-microsoft-prod.deb +$ rm packages-microsoft-prod.deb +$ sudo apt-get update +$ sudo apt-get install -y dotnet-sdk-2.1 +``` + +You will also want to make sure Python is installed as `python` for the Eclipser install to succeed. + +```sh +$ git clone https://github.com/SoftSec-KAIST/Eclipser.git +$ cd Eclipser +$ git checkout v1.x +$ make +$ cd .. +$ ./autogen.sh +$ ./configure --enable-fuzz +$ make +$ mkdir -p outputs/ +$ FUZZ=bech32 dotnet Eclipser/build/Eclipser.dll fuzz -p src/test/fuzz/fuzz -t 36000 -o outputs --src stdin +``` + +This will perform 10 hours of fuzzing. + +To make further use of the inputs generated by Eclipser, you +must first decode them: + +```sh +$ dotnet Eclipser/build/Eclipser.dll decode -i outputs/testcase -o decoded_outputs +``` +This will place raw inputs in the directory `decoded_outputs/decoded_stdins`. Crashes are in the `outputs/crashes` directory, and must +be decoded in the same way. + +Fuzzing with Eclipser will likely be much more effective if using an existing corpus: + +```sh +$ git clone https://github.com/bitcoin-core/qa-assets +$ FUZZ=bech32 dotnet Eclipser/build/Eclipser.dll fuzz -p src/test/fuzz/fuzz -t 36000 -i qa-assets/fuzz_seed_corpus/bech32 outputs --src stdin +``` + +Note that fuzzing with Eclipser on certain targets (those that create 'full nodes', e.g. `process_message*`) will, +for now, slowly fill `/tmp/` with improperly cleaned-up files, which will cause spurious crashes. +See [this proposed patch](https://github.com/bitcoin/bitcoin/pull/22472) for more information. + +Read the [Eclipser documentation for v1.x](https://github.com/SoftSec-KAIST/Eclipser/tree/v1.x) for more details on using Eclipser. + + # OSS-Fuzz Bitcoin Core participates in Google's [OSS-Fuzz](https://github.com/google/oss-fuzz/tree/master/projects/bitcoin-core) |