Add fuzz testing using american fuzzy lop

Existing tests: block, transaction, signature, cold outputs,
cold transaction.

Data for these is in tests/data/fuzz.

A convenience shell script is in contrib/fuzz_testing/fuzz.sh, eg:

contrib/fuzz_testing/fuzz.sh signature

The fuzzer will run indefinitely, ^C to stop.

Fuzzing is currently supported for GCC only. I can't get CLANG
to build Monero here as it dies on some system headers, so if
someone wants to make it work on both, that'd be great.
In particular, the __AFL_LOOP construct should be made to work
so that a given run can fuzz multiple inputs, as the C++ load
time is substantial.

1 files changed, 96 insertions, 0 deletions

diff --git a/tests/fuzz/fuzzer.cpp b/tests/fuzz/fuzzer.cpp
new file mode 100644
index 000000000..3edf8cd19
--- /dev/null
+++ b/tests/fuzz/fuzzer.cpp
@@ -0,0 +1,96 @@
+// Copyright (c) 2017, The Monero Project
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+// 
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+// 
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+// 
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include <boost/program_options.hpp>
+#include "include_base_utils.h"
+#include "common/command_line.h"
+#include "fuzzer.h"
+
+#if (!defined(__clang__) || (__clang__ < 5))
+static int __AFL_LOOP(int)
+{
+  static int once = 0;
+  if (once)
+    return 0;
+  once = 1;
+  return 1;
+}
+#endif
+
+using namespace epee;
+using namespace boost::program_options;
+
+int run_fuzzer(int argc, const char **argv, Fuzzer &fuzzer)
+{
+  TRY_ENTRY();
+  string_tools::set_module_name_and_folder(argv[0]);
+
+  //set up logging options
+  mlog_configure(mlog_get_default_log_path("fuzztests.log"), true);
+  mlog_set_log("*:FATAL,logging:none");
+
+  options_description desc_options("Allowed options");
+  command_line::add_arg(desc_options, command_line::arg_help);
+
+  variables_map vm;
+  bool r = command_line::handle_error_helper(desc_options, [&]()
+  {
+    store(parse_command_line(argc, argv, desc_options), vm);
+    notify(vm);
+    return true;
+  });
+  if (!r)
+    return 1;
+
+  if (command_line::get_arg(vm, command_line::arg_help))
+  {
+    std::cout << desc_options << std::endl;
+    return 0;
+  }
+
+  if (argc < 2)
+  {
+    std::cout << desc_options << std::endl;
+    return 1;
+  }
+
+  int ret = fuzzer.init();
+  if (ret)
+    return ret;
+
+  const std::string filename = argv[1];
+  while (__AFL_LOOP(1000))
+  {
+    ret = fuzzer.run(filename);
+    if (ret)
+      return ret;
+  }
+
+  CATCH_ENTRY_L0("fuzzer_main", 1);
+  return 0;
+}