Add harness

Author: rnshah9

.github/workflows/mayhem.yml

@@ -51,7 +51,8 @@ jobs:
       fail-fast: false
       matrix:
         mayhemfile:
-          - mayhem/Mayhemfile
+          - mayhem/Mayhemfile_startsWith
+          - mayhem/Mayhemfile_pycdc
 
     steps:
       - uses: actions/checkout@v2

mayhem/Dockerfile

@@ -1,13 +1,15 @@
 FROM --platform=linux/amd64 ubuntu:22.04 as builder
 
 RUN apt-get update
-RUN DEBIAN_FRONTEND=noninteractive apt-get install -y build-essential cmake python-is-python3
+RUN DEBIAN_FRONTEND=noninteractive apt-get install -y build-essential cmake python-is-python3 clang
 
 COPY . /repo
 WORKDIR /repo/build
 RUN cmake .. -DCMAKE_INSTALL_PREFIX=/install
 RUN make -j8
 RUN make install
+RUN clang++ /repo/mayhem/fuzz_startsWith.cpp -fsanitize=fuzzer,address -I /repo/ -L /repo/build/ -lpycxx -o /fuzz
 
 FROM ubuntu:22.04 as package
 COPY --from=builder /install /install
+COPY --from=builder /fuzz /fuzz_startsWith

mayhem/Mayhemfile renamed to mayhem/Mayhemfile_pycdc

@@ -0,0 +1,6 @@
+project: pycdc
+target: startswith
+
+cmds:
+  - cmd: /fuzz
+    libfuzzer: true

mayhem/Mayhemfile_startsWith

@@ -0,0 +1,17 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <climits>
+
+#include <fuzzer/FuzzedDataProvider.h>
+#include "pyc_string.h"
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+    FuzzedDataProvider provider(data, size);
+    std::string str = provider.ConsumeRandomLengthString();
+
+    PycString pycString;
+    pycString.startsWith(str);
+
+    return 0;
+}