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merge bitcoin#23227: Avoid treating integer overflow as OP_0

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Kittywhiskers Van Gogh 2021-10-08 15:39:46 +02:00
parent 0188d32430
commit b383609a72
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GPG Key ID: 30CD0C065E5C4AAD
4 changed files with 31 additions and 34 deletions
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53
src/core_read.cpp
View File

@ -24,20 +24,20 @@ opcodetype ParseOpCode(const std::string& s)
{
static std::map<std::string, opcodetype> mapOpNames;
if (mapOpNames.empty())
{
for (unsigned int op = 0; op <= MAX_OPCODE; op++)
{
if (mapOpNames.empty()) {
for (unsigned int op = 0; op <= MAX_OPCODE; op++) {
// Allow OP_RESERVED to get into mapOpNames
if (op < OP_NOP && op != OP_RESERVED)
if (op < OP_NOP && op != OP_RESERVED) {
continue;
}
std::string strName = GetOpName(static_cast<opcodetype>(op));
if (strName == "OP_UNKNOWN")
if (strName == "OP_UNKNOWN") {
continue;
}
mapOpNames[strName] = static_cast<opcodetype>(op);
// Convenience: OP_ADD and just ADD are both recognized:
if (strName.compare(0, 3, "OP_") == 0) { // strName starts with "OP_"
if (strName.compare(0, 3, "OP_") == 0) { // strName starts with "OP_"
mapOpNames[strName.substr(3)] = static_cast<opcodetype>(op);
}
}
@ -56,44 +56,35 @@ CScript ParseScript(const std::string& s)
std::vector<std::string> words = SplitString(s, " \t\n");
for (std::vector<std::string>::const_iterator w = words.begin(); w != words.end(); ++w)
{
if (w->empty())
{
for (const std::string& w : words) {
if (w.empty()) {
// Empty string, ignore. (SplitString doesn't combine multiple separators)
}
else if (std::all_of(w->begin(), w->end(), ::IsDigit) ||
(w->front() == '-' && w->size() > 1 && std::all_of(w->begin()+1, w->end(), ::IsDigit)))
} else if (std::all_of(w.begin(), w.end(), ::IsDigit) ||
(w.front() == '-' && w.size() > 1 && std::all_of(w.begin() + 1, w.end(), ::IsDigit)))
{
// Number
int64_t n = LocaleIndependentAtoi<int64_t>(*w);
const auto num{ToIntegral<int64_t>(w)};
//limit the range of numbers ParseScript accepts in decimal
//since numbers outside -0xFFFFFFFF...0xFFFFFFFF are illegal in scripts
if (n > int64_t{0xffffffff} || n < -1 * int64_t{0xffffffff}) {
// limit the range of numbers ParseScript accepts in decimal
// since numbers outside -0xFFFFFFFF...0xFFFFFFFF are illegal in scripts
if (!num.has_value() || num > int64_t{0xffffffff} || num < -1 * int64_t{0xffffffff}) {
throw std::runtime_error("script parse error: decimal numeric value only allowed in the "
"range -0xFFFFFFFF...0xFFFFFFFF");
}
result << n;
}
else if (w->substr(0,2) == "0x" && w->size() > 2 && IsHex(std::string(w->begin()+2, w->end())))
{
result << num.value();
} else if (w.substr(0, 2) == "0x" && w.size() > 2 && IsHex(std::string(w.begin() + 2, w.end()))) {
// Raw hex data, inserted NOT pushed onto stack:
std::vector<unsigned char> raw = ParseHex(std::string(w->begin()+2, w->end()));
std::vector<unsigned char> raw = ParseHex(std::string(w.begin() + 2, w.end()));
result.insert(result.end(), raw.begin(), raw.end());
}
else if (w->size() >= 2 && w->front() == '\'' && w->back() == '\'')
{
} else if (w.size() >= 2 && w.front() == '\'' && w.back() == '\'') {
// Single-quoted string, pushed as data. NOTE: this is poor-man's
// parsing, spaces/tabs/newlines in single-quoted strings won't work.
std::vector<unsigned char> value(w->begin()+1, w->end()-1);
std::vector<unsigned char> value(w.begin() + 1, w.end() - 1);
result << value;
}
else
{
} else {
// opcode, e.g. OP_ADD or ADD:
result << ParseOpCode(*w);
result << ParseOpCode(w);
}
}

2
src/test/script_parse_tests.cpp
View File

@ -38,7 +38,6 @@ BOOST_AUTO_TEST_CASE(parse_script)
{"'17'", "023137"},
{"ELSE", "67"},
{"NOP10", "b9"},
{"11111111111111111111", "00"},
};
std::string all_in;
std::string all_out;
@ -49,6 +48,7 @@ BOOST_AUTO_TEST_CASE(parse_script)
}
BOOST_CHECK_EQUAL(HexStr(ParseScript(all_in)), all_out);
BOOST_CHECK_EXCEPTION(ParseScript("11111111111111111111"), std::runtime_error, HasReason("script parse error: decimal numeric value only allowed in the range -0xFFFFFFFF...0xFFFFFFFF"));
BOOST_CHECK_EXCEPTION(ParseScript("11111111111"), std::runtime_error, HasReason("script parse error: decimal numeric value only allowed in the range -0xFFFFFFFF...0xFFFFFFFF"));
BOOST_CHECK_EXCEPTION(ParseScript("OP_CHECKSIGADD"), std::runtime_error, HasReason("script parse error: unknown opcode"));
}

4
src/util/strencodings.h
View File

@ -90,7 +90,7 @@ void SplitHostPort(std::string in, uint16_t &portOut, std::string &hostOut);
// LocaleIndependentAtoi is provided for backwards compatibility reasons.
//
// New code should use the ParseInt64/ParseUInt64/ParseInt32/ParseUInt32 functions
// New code should use ToIntegral or the ParseInt* functions
// which provide parse error feedback.
//
// The goal of LocaleIndependentAtoi is to replicate the exact defined behaviour
@ -143,7 +143,7 @@ constexpr inline bool IsSpace(char c) noexcept {
/**
* Convert string to integral type T. Leading whitespace, a leading +, or any
* trailing character fail the parsing. The required format expressed as regex
* is `-?[0-9]+`.
* is `-?[0-9]+`. The minus sign is only permitted for signed integer types.
*
* @returns std::nullopt if the entire string could not be parsed, or if the
* parsed value is not in the range representable by the type T.

6
test/util/data/bitcoin-util-test.json
View File

@ -235,6 +235,12 @@
"output_cmp": "txcreate2.json",
"description": "Parses a transaction with no inputs and a single output script (output in json)"
},
{ "exec": "./dash-tx",
"args": ["-create", "outscript=0:999999999999999999999999999999"],
"return_code": 1,
"error_txt": "error: script parse error: decimal numeric value only allowed in the range -0xFFFFFFFF...0xFFFFFFFF",
"description": "Try to parse an output script with a decimal number above the allowed range"
},
{ "exec": "./dash-tx",
"args": ["-create", "outscript=0:9999999999"],
"return_code": 1,