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