compiler-rt/test/fuzzer/DeepRecursionTest.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. The fuzzer must find the deep recursion.
   6 // To generate a crashy input:
   7 // for((i=0;i<110;i++)); do echo -n ABCDEFGHIJ  >> INPUT; done
   8 #include <cstddef>
   9 #include <cstdint>
  10 #include <cstdlib>
  11
  12 static volatile int Sink;
  13
  14 void Recursive(const uint8_t *Data, size_t Size, int Depth) {
  15   if (Depth > 1000) abort();
  16   if (!Size) return;
  17   if (*Data == ('A' + Depth % 10))
  18     Recursive(Data + 1, Size - 1, Depth + 1);
  19   Sink++;
  20 }
  21
  22 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
  23   Recursive(Data, Size, 0);
  24   return 0;
  25 }
  26