llvm/tools/llvm-yaml-numeric-parser-fuzzer/yaml-numeric-parser-fuzzer.cpp

   1 //===-- yaml-numeric-parser-fuzzer.cpp - Fuzzer for YAML numeric parser ---===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "llvm/ADT/StringRef.h"
  10 #include "llvm/Support/Regex.h"
  11 #include "llvm/Support/YAMLTraits.h"
  12 #include <string>
  13
  14 inline bool isNumericRegex(llvm::StringRef S) {
  15   static llvm::Regex Infinity("^[-+]?(\\.inf|\\.Inf|\\.INF)$");
  16   static llvm::Regex Base8("^0o[0-7]+$");
  17   static llvm::Regex Base16("^0x[0-9a-fA-F]+$");
  18   static llvm::Regex Float(
  19       "^[-+]?(\\.[0-9]+|[0-9]+(\\.[0-9]*)?)([eE][-+]?[0-9]+)?$");
  20
  21   if (S.equals(".nan") || S.equals(".NaN") || S.equals(".NAN"))
  22     return true;
  23
  24   if (Infinity.match(S))
  25     return true;
  26
  27   if (Base8.match(S))
  28     return true;
  29
  30   if (Base16.match(S))
  31     return true;
  32
  33   if (Float.match(S))
  34     return true;
  35
  36   return false;
  37 }
  38
  39 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
  40   std::string Input(reinterpret_cast<const char *>(Data), Size);
  41   llvm::erase(Input, 0);
  42   if (!Input.empty() && llvm::yaml::isNumeric(Input) != isNumericRegex(Input))
  43     LLVM_BUILTIN_TRAP;
  44   return 0;
  45 }