Merge #18159: tests: Add --valgrind option to test/fuzz/test_runner.py for running fuzzing test cases under valgrind

1b068c50dd tests: Add --valgrind option to test/fuzz/test_runner.py for running fuzzing test cases under valgrind (practicalswift)

Pull request description:

  Add `--valgrind` option to `test/fuzz/test_runner.py` for running fuzzing test cases under `valgrind`.

  Test this PR using:

  ```
  $ make distclean
  $ ./autogen.sh
  $ CC=clang CXX=clang++ ./configure --enable-fuzz --with-sanitizers=fuzzer
  $ make
  $ git clone https://github.com/bitcoin-core/qa-assets
  $ test/fuzz/test_runner.py --valgrind -l DEBUG qa-assets/fuzz_seed_corpus/
  ```

ACKs for top commit:
  MarcoFalke:
    ACK 1b068c50dd 🌒

Tree-SHA512: e6eb99af1bceaa6f36f49092a05de415848099ccc1497cc098a62e925954c978cb37a46410b44ed5eef2c6464ca4ecb06397b75b5d35701f5a8525436e47b9fd

test/fuzz/test_runner.py

@@ -61,6 +61,11 @@ def main():
         action='store_true',
         help='If true, export coverage information to files in the seed corpus',
     )
+    parser.add_argument(
+        '--valgrind',
+        action='store_true',
+        help='If true, run fuzzing binaries under the valgrind memory error detector. Valgrind 3.14 or later required.',
+    )
     parser.add_argument(
         'seed_dir',
         help='The seed corpus to run on (must contain subfolders for each fuzz target).',
@@ -129,10 +134,11 @@ def main():
         test_list=test_list_selection,
         build_dir=config["environment"]["BUILDDIR"],
         export_coverage=args.export_coverage,
+        use_valgrind=args.valgrind,
     )
 
 
-def run_once(*, corpus, test_list, build_dir, export_coverage):
+def run_once(*, corpus, test_list, build_dir, export_coverage, use_valgrind):
     for t in test_list:
         corpus_path = os.path.join(corpus, t)
         if t in FUZZERS_MISSING_CORPORA:
@@ -143,6 +149,8 @@ def run_once(*, corpus, test_list, build_dir, export_coverage):
             '-detect_leaks=0',
             corpus_path,
         ]
+        if use_valgrind:
+            args = ['valgrind', '--quiet', '--error-exitcode=1', '--exit-on-first-error=yes'] + args
         logging.debug('Run {} with args {}'.format(t, args))
         result = subprocess.run(args, stderr=subprocess.PIPE, universal_newlines=True)
         output = result.stderr