compiler-rt/test/fuzzer/CustomMutatorWithLongSequencesTest.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 cutom mutator that results in long sequences of mutations.
   6 #include <assert.h>
   7 #include <cstddef>
   8 #include <cstdint>
   9 #include <cstdlib>
  10 #include <iostream>
  11 #include <ostream>
  12
  13 #include "FuzzerInterface.h"
  14
  15 static volatile int Sink;
  16
  17 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
  18   assert(Data);
  19   if (Size > 0 && Data[0] == 'H') {
  20     Sink = 1;
  21     if (Size > 1 && Data[1] == 'i') {
  22       Sink = 2;
  23       if (Size > 2 && Data[2] == '!') {
  24         std::cout << "BINGO; Found the target, exiting\n"
  25                   << std::flush;
  26         exit(1);
  27       }
  28     }
  29   }
  30   return 0;
  31 }
  32
  33 extern "C" size_t LLVMFuzzerCustomMutator(uint8_t *Data, size_t Size,
  34                                           size_t MaxSize, unsigned int Seed) {
  35   // Run this 25 times to generate a large mutation sequence.
  36   for (size_t i = 0; i < 25; i++) {
  37     LLVMFuzzerMutate(Data, Size, MaxSize);
  38   }
  39   return LLVMFuzzerMutate(Data, Size, MaxSize);
  40 }