compiler-rt/test/fuzzer/StrncmpOOBTest.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 // Test that libFuzzer itself does not read out of bounds.
   6 #include <assert.h>
   7 #include <cstddef>
   8 #include <cstdint>
   9 #include <cstdlib>
  10 #include <cstring>
  11 #include <iostream>
  12
  13 static volatile int Sink;
  14
  15 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
  16   if (Size < 5) return 0;
  17   const char *Ch = reinterpret_cast<const char *>(Data);
  18   if (Ch[Size - 3] == 'a')
  19     Sink = strncmp(Ch + Size - 3, "abcdefg", 6);
  20   return 0;
  21 }
  22