From 6d771f159985c631299aefa6146a5b8d018451eb Mon Sep 17 00:00:00 2001
From: David Korczynski <david@adalogics.com>
Date: Sat, 23 Dec 2023 02:45:00 -0800
Subject: [PATCH] Add fuzzing by way of ClusterFuzzLite

Signed-off-by: David Korczynski <david@adalogics.com>
---
 .clusterfuzzlite/Dockerfile        |  6 ++++++
 .clusterfuzzlite/README.md         |  3 +++
 .clusterfuzzlite/build.sh          | 14 ++++++++++++++
 .clusterfuzzlite/parser_fuzzer.cpp | 17 +++++++++++++++++
 .clusterfuzzlite/project.yaml      |  1 +
 .github/workflows/cflite_pr.yml    | 30 ++++++++++++++++++++++++++++++
 6 files changed, 71 insertions(+)
 create mode 100644 .clusterfuzzlite/Dockerfile
 create mode 100644 .clusterfuzzlite/README.md
 create mode 100644 .clusterfuzzlite/build.sh
 create mode 100644 .clusterfuzzlite/parser_fuzzer.cpp
 create mode 100644 .clusterfuzzlite/project.yaml
 create mode 100644 .github/workflows/cflite_pr.yml

diff --git a/.clusterfuzzlite/Dockerfile b/.clusterfuzzlite/Dockerfile
new file mode 100644
index 0000000..d7c3da8
--- /dev/null
+++ b/.clusterfuzzlite/Dockerfile
@@ -0,0 +1,6 @@
+FROM gcr.io/oss-fuzz-base/base-builder
+RUN apt-get update && apt-get install -y make autoconf automake libtool
+
+COPY . $SRC/muparserx
+COPY .clusterfuzzlite/build.sh $SRC/build.sh
+WORKDIR $SRC/muparserx
diff --git a/.clusterfuzzlite/README.md b/.clusterfuzzlite/README.md
new file mode 100644
index 0000000..4ee95c0
--- /dev/null
+++ b/.clusterfuzzlite/README.md
@@ -0,0 +1,3 @@
+# ClusterFuzzLite set up
+
+This folder contains a fuzzing set for [ClusterFuzzLite](https://google.github.io/clusterfuzzlite).
diff --git a/.clusterfuzzlite/build.sh b/.clusterfuzzlite/build.sh
new file mode 100644
index 0000000..cd87f10
--- /dev/null
+++ b/.clusterfuzzlite/build.sh
@@ -0,0 +1,14 @@
+#!/bin/bash -eu
+
+mkdir build
+cd build
+cmake ../
+make
+
+# Copy all fuzzer executables to $OUT/
+$CXX $CFLAGS $LIB_FUZZING_ENGINE \
+  $SRC/muparserx/.clusterfuzzlite/parser_fuzzer.cpp \
+  -stdlib=libc++ -std=c++17 \
+  -o $OUT/parser_fuzzer \
+  -I$SRC/muparserx/parser \
+  $SRC/muparserx/build/libmuparserx.a
diff --git a/.clusterfuzzlite/parser_fuzzer.cpp b/.clusterfuzzlite/parser_fuzzer.cpp
new file mode 100644
index 0000000..ff27258
--- /dev/null
+++ b/.clusterfuzzlite/parser_fuzzer.cpp
@@ -0,0 +1,17 @@
+#include "mpParser.h"
+#include <string>
+
+using namespace mup;
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+  std::string fuzz_input(reinterpret_cast<const char *>(data), size);
+  ParserX p;
+
+  try {
+    p.SetExpr(fuzz_input);
+    p.Eval();
+  } catch (...) {
+  }
+
+  return 0;
+}
diff --git a/.clusterfuzzlite/project.yaml b/.clusterfuzzlite/project.yaml
new file mode 100644
index 0000000..b478801
--- /dev/null
+++ b/.clusterfuzzlite/project.yaml
@@ -0,0 +1 @@
+language: c++
diff --git a/.github/workflows/cflite_pr.yml b/.github/workflows/cflite_pr.yml
new file mode 100644
index 0000000..d17530b
--- /dev/null
+++ b/.github/workflows/cflite_pr.yml
@@ -0,0 +1,30 @@
+name: ClusterFuzzLite PR fuzzing
+on:
+  workflow_dispatch:
+  pull_request:
+    branches: [ main ]
+permissions: read-all
+jobs:
+  PR:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        sanitizer: [address]
+    steps:
+    - name: Build Fuzzers (${{ matrix.sanitizer }})
+      id: build
+      uses: google/clusterfuzzlite/actions/build_fuzzers@v1
+      with:
+        sanitizer: ${{ matrix.sanitizer }}
+        language: c++
+        bad-build-check: false
+    - name: Run Fuzzers (${{ matrix.sanitizer }})
+      id: run
+      uses: google/clusterfuzzlite/actions/run_fuzzers@v1
+      with:
+        github-token: ${{ secrets.GITHUB_TOKEN }}
+        fuzz-seconds: 180
+        mode: 'code-change'
+        report-unreproducible-crashes: false
+        sanitizer: ${{ matrix.sanitizer }}