libsanitizer/asan/asan_scariness_score.h

   1 //===-- asan_scariness_score.h ----------------------------------*- C++ -*-===//
   2 //
   3 // This file is distributed under the University of Illinois Open Source
   4 // License. See LICENSE.TXT for details.
   5 //
   6 //===----------------------------------------------------------------------===//
   7 //
   8 // This file is a part of AddressSanitizer, an address sanity checker.
   9 //
  10 // Compute the level of scariness of the error message.
  11 // Don't expect any deep science here, just a set of heuristics that suggest
  12 // that e.g. 1-byte-read-global-buffer-overflow is less scary than
  13 // 8-byte-write-stack-use-after-return.
  14 //
  15 // Every error report has one or more features, such as memory access size,
  16 // type (read or write), type of accessed memory (e.g. free-d heap, or a global
  17 // redzone), etc. Every such feature has an int score and a string description.
  18 // The overall score is the sum of all feature scores and the description
  19 // is a concatenation of feature descriptions.
  20 // Examples:
  21 //  17 (4-byte-read-heap-buffer-overflow)
  22 //  65 (multi-byte-write-stack-use-after-return)
  23 //  10 (null-deref)
  24 //
  25 //===----------------------------------------------------------------------===//
  26
  27 #ifndef ASAN_SCARINESS_SCORE_H
  28 #define ASAN_SCARINESS_SCORE_H
  29
  30 #include "asan_flags.h"
  31 #include "sanitizer_common/sanitizer_common.h"
  32 #include "sanitizer_common/sanitizer_libc.h"
  33
  34 namespace __asan {
  35 struct ScarinessScoreBase {
  36   void Clear() {
  37     descr[0] = 0;
  38     score = 0;
  39   }
  40   void Scare(int add_to_score, const char *reason) {
  41     if (descr[0])
  42       internal_strlcat(descr, "-", sizeof(descr));
  43     internal_strlcat(descr, reason, sizeof(descr));
  44     score += add_to_score;
  45   };
  46   int GetScore() const { return score; }
  47   const char *GetDescription() const { return descr; }
  48   void Print() {
  49     if (score && flags()->print_scariness)
  50       Printf("SCARINESS: %d (%s)\n", score, descr);
  51   }
  52   static void PrintSimple(int score, const char *descr) {
  53     ScarinessScoreBase SSB;
  54     SSB.Clear();
  55     SSB.Scare(score, descr);
  56     SSB.Print();
  57   }
  58
  59  private:
  60   int score;
  61   char descr[1024];
  62 };
  63
  64 struct ScarinessScore : ScarinessScoreBase {
  65   ScarinessScore() {
  66     Clear();
  67   }
  68 };
  69
  70 }  // namespace __asan
  71
  72 #endif  // ASAN_SCARINESS_SCORE_H