changed example, added pipeline for testing

Author: StephanKa

.github/workflows/build_cmake.yml

@@ -187,3 +187,48 @@ jobs:
     - name: Build
       shell: bash
       run:  cmake --build --preset build-gcc-arm-${{ matrix.buildtype }}
+
+  linux-fuzzing:
+    name: ${{ matrix.os }}, ${{ matrix.compiler.name }}, C++${{ matrix.cxx }}, ${{ matrix.buildtype }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false  # 'false' means Don't stop matrix workflows even if some matrix entry fails.
+      matrix:
+        os: [ubuntu-22.04]
+        buildtype: [debug]
+        compiler: [{name: 'Clang 15', preset: clang-15, pkgs: 'clang-15 llvm-15'}]
+        cxx: [20]
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Cache
+      uses: actions/cache@v3
+      env:
+        cache-name: cache-conan-modules
+      with:
+        path: |
+          ${{ env.CONAN_USER_HOME }}
+          ~/.cache/pip
+        key: ${{ runner.os }}-${{ env.BUILD_TYPE }}-${{ hashFiles('CMakeLists.txt') }}-${{ hashFiles('cmake/Conan.cmake') }}
+
+    - name: Install conan
+      shell: bash
+      run: |
+        python3 -m pip install --upgrade pip setuptools conan==1.59
+        source ~/.profile
+
+    - name: Install dependencies
+      run:   |
+             sudo bash -c "$(wget -O - https://apt.llvm.org/llvm.sh)"
+             sudo apt update
+             sudo apt install ninja-build ${{ matrix.compiler.pkgs }}
+      shell: bash
+
+    - name: Configure via CMake
+      shell: bash
+      run: cmake --preset unixlike-${{ matrix.compiler.preset }}-${{ matrix.buildtype }}
+
+    - name: Build
+      shell: bash
+      run:  cmake --build --preset build-unixlike-${{ matrix.compiler.preset }}-${{ matrix.buildtype }}

CMakePresets.json

@@ -350,6 +350,23 @@
         "CMAKE_TRY_COMPILE_TARGET_TYPE": "STATIC_LIBRARY",
         "CMAKE_CROSSCOMPILING": "TRUE"
       }
+    },
+    {
+      "name": "clang-15-fuzzing",
+      "description": "Clang 15 fuzzer test",
+      "binaryDir": "${sourceDir}/out/build/${presetName}",
+      "installDir": "${sourceDir}/out/install/${presetName}",
+      "cacheVariables": {
+        "CMAKE_C_COMPILER": "clang-15",
+        "CMAKE_CXX_COMPILER": "clang++-15",
+        "CMAKE_BUILD_TYPE": "Debug",
+        "ENABLE_COVERAGE": "ON",
+        "ENABLE_SANITIZER_ADDRESS": "ON",
+        "ENABLE_SANITIZER_LEAK": "ON",
+        "ENABLE_SANITIZER_UNDEFINED_BEHAVIOR": "ON",
+        "ENABLE_SANITIZER_MEMORY": "OFF",
+        "ENABLE_FUZZING": "ON"
+      }
     }
   ],
   "buildPresets": [
@@ -444,6 +461,10 @@
     {
       "name": "build-gcc-arm-release",
       "configurePreset": "gcc-arm-release"
+    },
+    {
+      "name": "build-clang-15-fuzzing",
+      "configurePreset": "clang-15-fuzzing"
     }
   ],
   "testPresets": [
@@ -612,6 +633,13 @@
       "inherits": "test-common",
       "configuration": "Release",
       "configurePreset": "win32-gcc-x64-mingw-release"
+    },
+    {
+      "name": "test-clang-15-fuzzing",
+      "displayName": "Strict",
+      "description": "Enable output and stop on failure",
+      "inherits": "test-common",
+      "configurePreset": "clang-15-fuzzing"
     }
   ]
 }

fuzz_test/CMakeLists.txt

@@ -13,7 +13,7 @@ TARGET_COMPILE_OPTIONS(fuzz_tester PRIVATE -fsanitize=fuzzer,undefined,address)
 
 # Allow short runs during automated testing to see if something new breaks
 SET(FUZZ_RUNTIME
-    10
-    CACHE STRING "Number of seconds to run fuzz tests during ctest run") # Default of 10 seconds
+        10
+        CACHE STRING "Number of seconds to run fuzz tests during ctest run") # Default of 10 seconds
 
 ADD_TEST(NAME fuzz_tester_run COMMAND fuzz_tester -max_total_time=${FUZZ_RUNTIME})

fuzz_test/fuzz_tester.cpp

@@ -1,20 +1,18 @@
-#include <fmt/format.h>
-#include <iterator>
-#include <utility>
+#include <stdint.h>
+#include <stddef.h>
 
-[[nodiscard]] auto sum_values(const uint8_t *Data, size_t Size)
-{
-    constexpr auto scale = 1000;
 
-    int value = 0;
-    for (std::size_t offset = 0; offset < Size; ++offset) { value += static_cast<int>(*std::next(Data, static_cast<long>(offset))) * scale; }
-    return value;
+// example comes from here: https://github.com/google/fuzzing/blob/master/tutorial/libFuzzer/fuzz_me.cc
+// Documentation can be found here: https://llvm.org/docs/LibFuzzer.html
+bool FuzzMe(const uint8_t *Data, size_t DataSize) {
+    return DataSize >= 3 &&
+           Data[0] == 'F' &&
+           Data[1] == 'U' &&
+           Data[2] == 'Z' &&
+           Data[3] == 'Z';  // :‑<
 }
 
-// Fuzzer that attempts to invoke undefined behavior for signed integer overflow
-// cppcheck-suppress unusedFunction symbolName=LLVMFuzzerTestOneInput
-extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
-{
-    fmt::print("Value sum: {}, len{}\n", sum_values(Data, Size), Size);
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+    FuzzMe(Data, Size);
     return 0;
 }