Add libfuzzer

Signed-off-by: AdamKorcz <adam@adalogics.com>

Author: AdamKorcz

test/fuzzing/buffer_fuzzer.c

@@ -0,0 +1,59 @@
+/* Copyright 2021 Samsung Electronics Co., Ltd. and other contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+int
+LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+  if(size<20) {
+    return 0;
+  }
+
+  // Skip test cases with double quotes
+  for (int i=0; i<size; i++) {
+    if(data[i]==34) {
+      return 0;
+    }
+  }
+
+  // Create javascript file
+  char filename[256];
+  sprintf(filename, "/tmp/libfuzzer.js");
+
+  // Create javascript code
+  char one[] = "(new Buffer(\"";
+  char two[] = "\")).slice(0, 1).readUInt16LE({}, true);');\n";
+  FILE *fp = fopen(filename, "wb");
+  if (!fp)
+    return 0;  
+  fwrite(one, sizeof(char), strlen(one), fp);
+  fwrite(data, size, 1, fp);
+  fwrite(two, sizeof(char), strlen(two), fp);
+  fclose(fp);
+
+  int argc = 2;
+  char* argv[argc];
+  argv[0] = "iotjs";
+  argv[1] = "/tmp/libfuzzer.js";
+
+  iotjs_entry(argc, argv);
+  
+  unlink(filename);
+  return 0;
+}