Branch data     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 : }