compiler-rt/test/fuzzer/LoadTest.cpp

   1 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   2 // See https://llvm.org/LICENSE.txt for license information.
   3 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   4
   5 // Simple test for a fuzzer: find interesting value of array index.
   6 #include <assert.h>
   7 #include <cstddef>
   8 #include <cstdint>
   9 #include <cstring>
  10 #include <iostream>
  11
  12 static volatile uint8_t Sink;
  13 const int kArraySize = 32505854; // 0x01effffe
  14 uint8_t array[kArraySize];
  15
  16 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
  17   if (Size != 8)
  18     return 0;
  19   uint64_t a = 0;
  20   memcpy(&a, Data, sizeof(a));
  21   a &= 0x1fffffff;
  22   Sink = array[a % (kArraySize + 1)];
  23   return 0;
  24 }