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//===-- asan_scariness_score.h ----------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is a part of AddressSanitizer, an address sanity checker.
//
// Compute the level of scariness of the error message.
// Don't expect any deep science here, just a set of heuristics that suggest
// that e.g. 1-byte-read-global-buffer-overflow is less scary than
// 8-byte-write-stack-use-after-return.
//
// Every error report has one or more features, such as memory access size,
// type (read or write), type of accessed memory (e.g. free-d heap, or a global
// redzone), etc. Every such feature has an int score and a string description.
// The overall score is the sum of all feature scores and the description
// is a concatenation of feature descriptions.
// Examples:
// 17 (4-byte-read-heap-buffer-overflow)
// 65 (multi-byte-write-stack-use-after-return)
// 10 (null-deref)
//
//===----------------------------------------------------------------------===//
#ifndef ASAN_SCARINESS_SCORE_H
#define ASAN_SCARINESS_SCORE_H
#include "asan_flags.h"
#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_libc.h"
namespace __asan {
struct ScarinessScoreBase {
void Clear() {
descr[0] = 0;
score = 0;
}
void Scare(int add_to_score, const char *reason) {
if (descr[0])
internal_strlcat(descr, "-", sizeof(descr));
internal_strlcat(descr, reason, sizeof(descr));
score += add_to_score;
}
int GetScore() const { return score; }
const char *GetDescription() const { return descr; }
void Print() const {
if (score && flags()->print_scariness)
Printf("SCARINESS: %d (%s)\n", score, descr);
}
static void PrintSimple(int score, const char *descr) {
ScarinessScoreBase SSB;
SSB.Clear();
SSB.Scare(score, descr);
SSB.Print();
}
private:
int score;
char descr[1024];
};
struct ScarinessScore : ScarinessScoreBase {
ScarinessScore() {
Clear();
}
};
} // namespace __asan
#endif // ASAN_SCARINESS_SCORE_H
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