Line data    Source code

       1             : // Copyright (c) 2020-2021 The Bitcoin Core developers
       2             : // Distributed under the MIT software license, see the accompanying
       3             : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
       4             : 
       5             : #include <script/script.h>
       6             : #include <test/fuzz/FuzzedDataProvider.h>
       7             : #include <test/fuzz/fuzz.h>
       8             : #include <test/fuzz/util.h>
       9             : 
      10             : #include <cassert>
      11             : #include <cstdint>
      12             : #include <limits>
      13             : #include <vector>
      14             : 
      15             : namespace {
      16           0 : bool IsValidAddition(const CScriptNum& lhs, const CScriptNum& rhs)
      17             : {
      18           0 :     return rhs == 0 || (rhs > 0 && lhs <= CScriptNum{std::numeric_limits<int64_t>::max()} - rhs) || (rhs < 0 && lhs >= CScriptNum{std::numeric_limits<int64_t>::min()} - rhs);
      19             : }
      20             : 
      21           0 : bool IsValidSubtraction(const CScriptNum& lhs, const CScriptNum& rhs)
      22             : {
      23           0 :     return rhs == 0 || (rhs > 0 && lhs >= CScriptNum{std::numeric_limits<int64_t>::min()} + rhs) || (rhs < 0 && lhs <= CScriptNum{std::numeric_limits<int64_t>::max()} + rhs);
      24             : }
      25           2 : } // namespace
      26             : 
      27           4 : FUZZ_TARGET(scriptnum_ops)
      28             : {
      29           0 :     FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
      30           0 :     CScriptNum script_num = ConsumeScriptNum(fuzzed_data_provider);
      31           0 :     LIMITED_WHILE(fuzzed_data_provider.remaining_bytes() > 0, 1000000) {
      32           0 :         CallOneOf(
      33             :             fuzzed_data_provider,
      34           0 :             [&] {
      35           0 :                 const int64_t i = fuzzed_data_provider.ConsumeIntegral<int64_t>();
      36           0 :                 assert((script_num == i) != (script_num != i));
      37           0 :                 assert((script_num <= i) != (script_num > i));
      38           0 :                 assert((script_num >= i) != (script_num < i));
      39             :                 // Avoid signed integer overflow:
      40             :                 // script/script.h:264:93: runtime error: signed integer overflow: -2261405121394637306 + -9223372036854775802 cannot be represented in type 'long'
      41           0 :                 if (IsValidAddition(script_num, CScriptNum{i})) {
      42           0 :                     assert((script_num + i) - i == script_num);
      43           0 :                 }
      44             :                 // Avoid signed integer overflow:
      45             :                 // script/script.h:265:93: runtime error: signed integer overflow: 9223371895120855039 - -9223372036854710486 cannot be represented in type 'long'
      46           0 :                 if (IsValidSubtraction(script_num, CScriptNum{i})) {
      47           0 :                     assert((script_num - i) + i == script_num);
      48           0 :                 }
      49           0 :             },
      50           0 :             [&] {
      51           0 :                 const CScriptNum random_script_num = ConsumeScriptNum(fuzzed_data_provider);
      52           0 :                 assert((script_num == random_script_num) != (script_num != random_script_num));
      53           0 :                 assert((script_num <= random_script_num) != (script_num > random_script_num));
      54           0 :                 assert((script_num >= random_script_num) != (script_num < random_script_num));
      55             :                 // Avoid signed integer overflow:
      56             :                 // script/script.h:264:93: runtime error: signed integer overflow: -9223126527765971126 + -9223372036854756825 cannot be represented in type 'long'
      57           0 :                 if (IsValidAddition(script_num, random_script_num)) {
      58           0 :                     assert((script_num + random_script_num) - random_script_num == script_num);
      59           0 :                 }
      60             :                 // Avoid signed integer overflow:
      61             :                 // script/script.h:265:93: runtime error: signed integer overflow: 6052837899185946624 - -9223372036854775808 cannot be represented in type 'long'
      62           0 :                 if (IsValidSubtraction(script_num, random_script_num)) {
      63           0 :                     assert((script_num - random_script_num) + random_script_num == script_num);
      64           0 :                 }
      65           0 :             },
      66           0 :             [&] {
      67           0 :                 const CScriptNum random_script_num = ConsumeScriptNum(fuzzed_data_provider);
      68           0 :                 if (!IsValidAddition(script_num, random_script_num)) {
      69             :                     // Avoid assertion failure:
      70             :                     // ./script/script.h:292: CScriptNum &CScriptNum::operator+=(const int64_t &): Assertion `rhs == 0 || (rhs > 0 && m_value <= std::numeric_limits<int64_t>::max() - rhs) || (rhs < 0 && m_value >= std::numeric_limits<int64_t>::min() - rhs)' failed.
      71           0 :                     return;
      72             :                 }
      73           0 :                 script_num += random_script_num;
      74           0 :             },
      75           0 :             [&] {
      76           0 :                 const CScriptNum random_script_num = ConsumeScriptNum(fuzzed_data_provider);
      77           0 :                 if (!IsValidSubtraction(script_num, random_script_num)) {
      78             :                     // Avoid assertion failure:
      79             :                     // ./script/script.h:300: CScriptNum &CScriptNum::operator-=(const int64_t &): Assertion `rhs == 0 || (rhs > 0 && m_value >= std::numeric_limits<int64_t>::min() + rhs) || (rhs < 0 && m_value <= std::numeric_limits<int64_t>::max() + rhs)' failed.
      80           0 :                     return;
      81             :                 }
      82           0 :                 script_num -= random_script_num;
      83           0 :             },
      84           0 :             [&] {
      85           0 :                 script_num = script_num & fuzzed_data_provider.ConsumeIntegral<int64_t>();
      86           0 :             },
      87           0 :             [&] {
      88           0 :                 script_num = script_num & ConsumeScriptNum(fuzzed_data_provider);
      89           0 :             },
      90           0 :             [&] {
      91           0 :                 script_num &= ConsumeScriptNum(fuzzed_data_provider);
      92           0 :             },
      93           0 :             [&] {
      94           0 :                 if (script_num == CScriptNum{std::numeric_limits<int64_t>::min()}) {
      95             :                     // Avoid assertion failure:
      96             :                     // ./script/script.h:279: CScriptNum CScriptNum::operator-() const: Assertion `m_value != std::numeric_limits<int64_t>::min()' failed.
      97           0 :                     return;
      98             :                 }
      99           0 :                 script_num = -script_num;
     100           0 :             },
     101           0 :             [&] {
     102           0 :                 script_num = fuzzed_data_provider.ConsumeIntegral<int64_t>();
     103           0 :             },
     104           0 :             [&] {
     105           0 :                 const int64_t random_integer = fuzzed_data_provider.ConsumeIntegral<int64_t>();
     106           0 :                 if (!IsValidAddition(script_num, CScriptNum{random_integer})) {
     107             :                     // Avoid assertion failure:
     108             :                     // ./script/script.h:292: CScriptNum &CScriptNum::operator+=(const int64_t &): Assertion `rhs == 0 || (rhs > 0 && m_value <= std::numeric_limits<int64_t>::max() - rhs) || (rhs < 0 && m_value >= std::numeric_limits<int64_t>::min() - rhs)' failed.
     109           0 :                     return;
     110             :                 }
     111           0 :                 script_num += random_integer;
     112           0 :             },
     113           0 :             [&] {
     114           0 :                 const int64_t random_integer = fuzzed_data_provider.ConsumeIntegral<int64_t>();
     115           0 :                 if (!IsValidSubtraction(script_num, CScriptNum{random_integer})) {
     116             :                     // Avoid assertion failure:
     117             :                     // ./script/script.h:300: CScriptNum &CScriptNum::operator-=(const int64_t &): Assertion `rhs == 0 || (rhs > 0 && m_value >= std::numeric_limits<int64_t>::min() + rhs) || (rhs < 0 && m_value <= std::numeric_limits<int64_t>::max() + rhs)' failed.
     118           0 :                     return;
     119             :                 }
     120           0 :                 script_num -= random_integer;
     121           0 :             },
     122           0 :             [&] {
     123           0 :                 script_num &= fuzzed_data_provider.ConsumeIntegral<int64_t>();
     124           0 :             });
     125           0 :         (void)script_num.getint();
     126           0 :         (void)script_num.getvch();
     127           0 :     }
     128           0 : }