Add harness

.github/workflows/mayhem.yml

@@ -59,7 +59,8 @@ jobs:
       fail-fast: false
       matrix:
         mayhemfile:
-          - mayhem/Mayhemfile
+          - mayhem/Mayhemfile_elf2nro
+          - mayhem/Mayhemfile_local_bswap64
 
     steps:
       - uses: actions/checkout@v3

mayhem/Dockerfile

@@ -1,7 +1,7 @@
-FROM --platform=linux/amd64 ubuntu:20.04 as builder
+FROM --platform=linux/amd64 ubuntu:22.04 as builder
 
 RUN apt-get update
-RUN DEBIAN_FRONTEND=noninteractive apt-get install -y build-essential automake pkg-config libtool liblz4-dev libz-dev
+RUN DEBIAN_FRONTEND=noninteractive apt-get install -y build-essential automake pkg-config libtool liblz4-dev libz-dev clang
 
 COPY . /repo
 WORKDIR /repo
@@ -10,6 +10,10 @@ RUN ./configure --prefix=/install
 RUN make -j8
 RUN make install
 
-FROM ubuntu:20.04 as package
+WORKDIR /repo/src
+RUN clang++ /repo/mayhem/fuzz_local_bswap64.cpp -fsanitize=fuzzer,address -o /fuzz -I /repo/src
+
+FROM ubuntu:22.04 as package
 COPY --from=builder /install /install
 COPY --from=builder /repo/elf2nro /
+COPY --from=builder /fuzz /fuzz_local_bswap64

mayhem/Mayhemfile_local_bswap64

@@ -0,0 +1,5 @@
+project: switch-tools
+target: local-bswap64
+
+cmds:
+  - cmd: /fuzz_local_bswap64

mayhem/fuzz_local_bswap64.cpp

@@ -0,0 +1,14 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <climits>
+
+#include "types.h"
+#include <fuzzer/FuzzedDataProvider.h>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+    FuzzedDataProvider provider(data, size);
+    uint64_t x = provider.ConsumeIntegral<uint64_t>();
+    __local_bswap64(x);
+    return 0;
+}