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 36namespace __asan { 37class 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