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ExprEngine: execute functions in same TU

This commit is contained in:
Daniel Marjamäki 2020-06-19 10:27:59 +02:00
parent 4acc63ac48
commit cbe038e694
2 changed files with 153 additions and 91 deletions
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231
lib/exprengine.cpp
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@ -293,6 +293,7 @@ namespace {
, errorLogger(errorLogger)
, tokenizer(tokenizer)
, callbacks(callbacks)
, recursion(0)
, mTrackExecution(trackExecution)
, mDataIndex(trackExecution->getNewDataIndex()) {}
typedef std::map<nonneg int, ExprEngine::ValuePtr> Memory;
@ -302,6 +303,7 @@ namespace {
const Tokenizer * const tokenizer;
const std::vector<ExprEngine::Callback> &callbacks;
std::vector<ExprEngine::ValuePtr> constraints;
int recursion;
ExprEngine::ValuePtr executeContract(const Function *function, ExprEngine::ValuePtr(*executeExpression)(const Token*, Data&)) {
const auto it = settings->functionContracts.find(function->fullName());
@ -331,10 +333,6 @@ namespace {
constraints.push_back(value);
}
void addError(int linenr) OVERRIDE {
mTrackExecution->addError(linenr);
}
void assignValue(const Token *tok, unsigned int varId, ExprEngine::ValuePtr value) {
if (varId == 0)
return;
@ -494,6 +492,27 @@ namespace {
addConstraint(std::make_shared<ExprEngine::BinOpResult>("<=", value, std::make_shared<ExprEngine::IntRange>(std::to_string(high), high, high)), true);
}
void reportError(const Token *tok,
Severity::SeverityType severity,
const char id[],
const std::string &text,
CWE cwe,
bool inconclusive,
bool incomplete,
const std::string functionName) OVERRIDE
{
if (errorPath.empty())
mTrackExecution->addError(tok->linenr());
ErrorPath e = errorPath;
e.push_back(ErrorPathItem(tok, text));
ErrorMessage errmsg(e, &tokenizer->list, severity, id, text, cwe, inconclusive);
errmsg.incomplete = incomplete;
errmsg.function = functionName.empty() ? currentFunction : functionName;
errorLogger->reportErr(errmsg);
}
private:
TrackExecution * const mTrackExecution;
const int mDataIndex;
@ -1255,6 +1274,7 @@ static void call(const std::vector<ExprEngine::Callback> &callbacks, const Token
static ExprEngine::ValuePtr executeExpression(const Token *tok, Data &data);
static ExprEngine::ValuePtr executeExpression1(const Token *tok, Data &data);
static void execute(const Token *start, const Token *end, Data &data);
static ExprEngine::ValuePtr calculateArrayIndex(const Token *tok, Data &data, const ExprEngine::ArrayValue &arrayValue)
{
@ -1465,39 +1485,34 @@ static void checkContract(Data &data, const Token *tok, const Function *function
}
if (bailoutValue || solver.check() == z3::sat) {
data.addError(tok->linenr());
std::list<const Token*> callstack{tok};
const char * const id = "bughuntingFunctionCall";
const char id[] = "bughuntingFunctionCall";
const auto contractIt = data.settings->functionContracts.find(function->fullName());
const std::string functionName = contractIt->first;
const std::string functionExpects = contractIt->second;
ErrorMessage errmsg(callstack,
&data.tokenizer->list,
Severity::SeverityType::error,
id,
"Function '" + function->name() + "' is called, can not determine that its contract '" + functionExpects + "' is always met.",
CWE(0),
false);
errmsg.incomplete = bailoutValue;
errmsg.function = functionName;
data.errorLogger->reportErr(errmsg);
data.reportError(tok,
Severity::SeverityType::error,
id,
"Function '" + function->name() + "' is called, can not determine that its contract '" + functionExpects + "' is always met.",
CWE(0),
false,
bailoutValue,
functionName);
}
} catch (const z3::exception &exception) {
std::cerr << "z3: " << exception << std::endl;
} catch (const BugHuntingException &e) {
std::list<const Token*> callstack{tok};
const char * const id = "internalErrorInExprEngine";
const char id[] = "internalErrorInExprEngine";
const auto contractIt = data.settings->functionContracts.find(function->fullName());
const std::string functionName = contractIt->first;
const std::string functionExpects = contractIt->second;
ErrorMessage errmsg(callstack,
&data.tokenizer->list,
Severity::SeverityType::error,
id,
"Function '" + function->name() + "' is called, can not determine that its contract is always met.",
CWE(0),
false);
errmsg.incomplete = true;
data.errorLogger->reportErr(errmsg);
data.reportError(tok,
Severity::SeverityType::error,
id,
"Function '" + function->name() + "' is called, can not determine that its contract '" + functionExpects + "' is always met.",
CWE(0),
false,
true,
functionName);
}
}
#endif
@ -1518,7 +1533,7 @@ static ExprEngine::ValuePtr executeFunctionCall(const Token *tok, Data &data)
std::vector<ExprEngine::ValuePtr> argValues;
for (const Token *argtok : getArguments(tok)) {
auto val = executeExpression(argtok, data);
auto val = executeExpression1(argtok, data);
argValues.push_back(val);
if (!argtok->valueType() || (argtok->valueType()->constness & 1) == 1)
continue;
@ -1536,11 +1551,12 @@ static ExprEngine::ValuePtr executeFunctionCall(const Token *tok, Data &data)
}
if (tok->astOperand1()->function()) {
const std::string &functionName = tok->astOperand1()->function()->fullName();
const Function *function = tok->astOperand1()->function();
const std::string &functionName = function->fullName();
const auto contractIt = data.settings->functionContracts.find(functionName);
if (contractIt != data.settings->functionContracts.end()) {
#ifdef USE_Z3
checkContract(data, tok, tok->astOperand1()->function(), argValues);
checkContract(data, tok, function, argValues);
#endif
} else if (!argValues.empty()) {
bool bailout = false;
@ -1549,6 +1565,22 @@ static ExprEngine::ValuePtr executeFunctionCall(const Token *tok, Data &data)
if (!bailout)
data.addMissingContract(functionName);
}
// Execute subfunction..
if (function->hasBody()) {
const Scope *functionScope = function->functionScope;
int argnr = 0;
for (const Variable &arg: function->argumentList) {
if (argnr < argValues.size())
data.assignValue(function->functionScope->bodyStart, arg.declarationId(), argValues[argnr]);
// TODO default values!
argnr++;
}
data.contractConstraints(function, executeExpression1);
data.errorPath.push_back(ErrorPathItem(tok, "Calling " + function->name()));
execute(functionScope->bodyStart, functionScope->bodyEnd, data);
data.errorPath.pop_back();
}
}
auto val = getValueRangeFromValueType(data.getNewSymbolName(), tok->valueType(), *data.settings);
@ -1838,12 +1870,25 @@ static ExprEngine::ValuePtr executeExpression(const Token *tok, Data &data)
static ExprEngine::ValuePtr createVariableValue(const Variable &var, Data &data);
static void execute(const Token *start, const Token *end, Data &data, int recursion=0)
static void execute(const Token *start, const Token *end, Data &data)
{
if (++recursion > 20)
if (data.recursion > 20)
// FIXME
return;
// Update data.recursion
struct Recursion {
Recursion(int *var, int value) : var(var), value(value) {
*var = value + 1;
}
~Recursion() {
if (*var >= value) *var = value;
}
int *var;
int value;
};
Recursion updateRecursion(&data.recursion, data.recursion);
for (const Token *tok = start; tok != end; tok = tok->next()) {
if (Token::Match(tok, "[;{}]"))
data.trackProgramState(tok);
@ -1909,7 +1954,7 @@ static void execute(const Token *start, const Token *end, Data &data, int recurs
std::string exceptionMessage;
auto exec = [&](const Token *tok1, const Token *tok2, Data& data) {
try {
execute(tok1, tok2, data, recursion);
execute(tok1, tok2, data);
} catch (BugHuntingException &e) {
if (!exceptionToken || (e.tok && precedes(e.tok, exceptionToken))) {
exceptionToken = e.tok;
@ -1942,7 +1987,7 @@ static void execute(const Token *start, const Token *end, Data &data, int recurs
std::string exceptionMessage;
auto exec = [&](const Token *tok1, const Token *tok2, Data& data) {
try {
execute(tok1, tok2, data, recursion);
execute(tok1, tok2, data);
} catch (BugHuntingException &e) {
if (!exceptionToken || (e.tok && precedes(e.tok, exceptionToken))) {
exceptionToken = e.tok;
@ -2271,14 +2316,14 @@ void ExprEngine::runChecks(ErrorLogger *errorLogger, const Tokenizer *tokenizer,
if (!overflowArgument)
return;
dataBase->addError(tok->linenr());
std::list<const Token*> callstack{tok};
ErrorMessage errmsg(callstack, &tokenizer->list, Severity::SeverityType::error, "bughuntingBufferOverflow", "Buffer read/write, when calling '" + ftok->str() + "' it cannot be determined that " + std::to_string(overflowArgument) + getOrdinalText(overflowArgument) + " argument is not overflowed", CWE(120), false);
if (value.type == ExprEngine::ValueType::BailoutValue)
errmsg.incomplete = true;
else
errmsg.function = dataBase->currentFunction;
errorLogger->reportErr(errmsg);
const bool bailout = (value.type == ExprEngine::ValueType::BailoutValue);
dataBase->reportError(tok,
Severity::SeverityType::error,
"bughuntingBufferOverflow",
"Buffer read/write, when calling '" + ftok->str() + "' it cannot be determined that " + std::to_string(overflowArgument) + getOrdinalText(overflowArgument) + " argument is not overflowed",
CWE(120),
false,
bailout);
};
std::function<void(const Token *, const ExprEngine::Value &, ExprEngine::DataBase *)> divByZero = [=](const Token *tok, const ExprEngine::Value &value, ExprEngine::DataBase *dataBase) {
@ -2298,16 +2343,15 @@ void ExprEngine::runChecks(ErrorLogger *errorLogger, const Tokenizer *tokenizer,
return;
}
if (tok->astParent()->astOperand2() == tok && value.isEqual(dataBase, 0)) {
dataBase->addError(tok->linenr());
std::list<const Token*> callstack{settings->clang ? tok : tok->astParent()};
const char * const id = (tok->valueType() && tok->valueType()->isFloat()) ? "bughuntingDivByZeroFloat" : "bughuntingDivByZero";
const bool bailout = (value.type == ExprEngine::ValueType::BailoutValue);
ErrorMessage errmsg(callstack, &tokenizer->list, Severity::SeverityType::error, id, "There is division, cannot determine that there can't be a division by zero.", CWE(369), false);
if (!bailout)
errmsg.function = dataBase->currentFunction;
else
errmsg.incomplete = bailout;
errorLogger->reportErr(errmsg);
dataBase->reportError(settings->clang ? tok : tok->astParent(),
Severity::SeverityType::error,
id,
"There is division, cannot determine that there can't be a division by zero.",
CWE(369),
false,
bailout);
}
};
@ -2354,9 +2398,7 @@ void ExprEngine::runChecks(ErrorLogger *errorLogger, const Tokenizer *tokenizer,
if (tok->valueType()->sign == ::ValueType::Sign::UNSIGNED)
errorMessage += " Note that unsigned integer overflow is defined and will wrap around.";
std::list<const Token*> callstack{tok};
ErrorMessage errmsg(callstack, &tokenizer->list, Severity::SeverityType::error, "bughuntingIntegerOverflow", errorMessage, false);
errorLogger->reportErr(errmsg);
dataBase->reportError(tok, Severity::SeverityType::error, "bughuntingIntegerOverflow", errorMessage, false, value.type == ExprEngine::ValueType::BailoutValue);
};
#endif
@ -2423,6 +2465,27 @@ void ExprEngine::runChecks(ErrorLogger *errorLogger, const Tokenizer *tokenizer,
}
// Uninitialized function argument
if (Token::Match(tok->astParent(), "[,(]")) {
const Token *parent = tok->astParent();
int count = 0;
if (Token::simpleMatch(parent, ",")) {
if (tok == parent->astOperand2())
++count;
while (Token::simpleMatch(parent, ",")) {
count++;
parent = parent->astParent();
}
}
if (Token::simpleMatch(parent, "(") && parent->astOperand1() != tok) {
if (parent->astOperand1()->function()) {
const Variable *argvar = parent->astOperand1()->function()->getArgumentVar(count);
if (argvar && argvar->isReference() && !argvar->isConst())
return;
}
}
}
// Avoid FP for array declaration
const Token *parent = tok->astParent();
while (parent && parent->str() == "[")
@ -2430,15 +2493,23 @@ void ExprEngine::runChecks(ErrorLogger *errorLogger, const Tokenizer *tokenizer,
if (!parent)
return;
dataBase->addError(tok->linenr());
std::list<const Token*> callstack{tok};
if (!uninitStructMember.empty()) {
ErrorMessage errmsg(callstack, &tokenizer->list, Severity::SeverityType::error, "bughuntingUninitStructMember", "Cannot determine that '" + tok->expressionString() + "." + uninitStructMember + "' is initialized", CWE_USE_OF_UNINITIALIZED_VARIABLE, false);
errorLogger->reportErr(errmsg);
dataBase->reportError(tok,
Severity::SeverityType::error,
"bughuntingUninitStructMember",
"Cannot determine that '" + tok->expressionString() + "." + uninitStructMember + "' is initialized",
CWE_USE_OF_UNINITIALIZED_VARIABLE,
false,
value.type == ExprEngine::ValueType::BailoutValue);
return;
}
ErrorMessage errmsg(callstack, &tokenizer->list, Severity::SeverityType::error, "bughuntingUninit", "Cannot determine that '" + tok->expressionString() + "' is initialized", CWE_USE_OF_UNINITIALIZED_VARIABLE, false);
errorLogger->reportErr(errmsg);
dataBase->reportError(tok,
Severity::SeverityType::error,
"bughuntingUninit",
"Cannot determine that '" + tok->expressionString() + "' is initialized",
CWE_USE_OF_UNINITIALIZED_VARIABLE,
false,
value.type == ExprEngine::ValueType::BailoutValue);
};
std::function<void(const Token *, const ExprEngine::Value &, ExprEngine::DataBase *)> checkFunctionCall = [=](const Token *tok, const ExprEngine::Value &value, ExprEngine::DataBase *dataBase) {
@ -2479,14 +2550,12 @@ void ExprEngine::runChecks(ErrorLogger *errorLogger, const Tokenizer *tokenizer,
}
if (!bad.empty()) {
dataBase->addError(tok->linenr());
std::list<const Token*> callstack{tok};
ErrorMessage errmsg(callstack,
&tokenizer->list,
Severity::SeverityType::error,
"bughuntingInvalidArgValue",
"There is function call, cannot determine that " + std::to_string(num) + getOrdinalText(num) + " argument value meets the attribute " + bad, CWE(0), false);
errorLogger->reportErr(errmsg);
dataBase->reportError(tok,
Severity::SeverityType::error,
"bughuntingInvalidArgValue",
"There is function call, cannot determine that " + std::to_string(num) + getOrdinalText(num) + " argument value meets the attribute " + bad,
CWE(0),
false);
return;
}
}
@ -2531,10 +2600,7 @@ void ExprEngine::runChecks(ErrorLogger *errorLogger, const Tokenizer *tokenizer,
}
if (err) {
dataBase->addError(tok->linenr());
std::list<const Token*> callstack{tok};
ErrorMessage errmsg(callstack, &tokenizer->list, Severity::SeverityType::error, "bughuntingInvalidArgValue", "There is function call, cannot determine that " + std::to_string(num) + getOrdinalText(num) + " argument value is valid. Bad value: " + bad, CWE(0), false);
errorLogger->reportErr(errmsg);
dataBase->reportError(tok, Severity::SeverityType::error, "bughuntingInvalidArgValue", "There is function call, cannot determine that " + std::to_string(num) + getOrdinalText(num) + " argument value is valid. Bad value: " + bad, CWE(0), false);
break;
}
}
@ -2545,10 +2611,7 @@ void ExprEngine::runChecks(ErrorLogger *errorLogger, const Tokenizer *tokenizer,
auto index0 = std::make_shared<ExprEngine::IntRange>("0", 0, 0);
for (const auto &v: arrayValue.read(index0)) {
if (v.second->isUninit()) {
dataBase->addError(tok->linenr());
std::list<const Token*> callstack{tok};
ErrorMessage errmsg(callstack, &tokenizer->list, Severity::SeverityType::error, "bughuntingUninitArg", "There is function call, cannot determine that " + std::to_string(num) + getOrdinalText(num) + " argument is initialized.", CWE_USE_OF_UNINITIALIZED_VARIABLE, false);
errorLogger->reportErr(errmsg);
dataBase->reportError(tok, Severity::SeverityType::error, "bughuntingUninitArg", "There is function call, cannot determine that " + std::to_string(num) + getOrdinalText(num) + " argument is initialized.", CWE_USE_OF_UNINITIALIZED_VARIABLE, false);
break;
}
}
@ -2568,22 +2631,14 @@ void ExprEngine::runChecks(ErrorLogger *errorLogger, const Tokenizer *tokenizer,
MathLib::bigint low;
if (vartok->getCppcheckAttribute(TokenImpl::CppcheckAttributes::Type::LOW, &low)) {
if (value.isLessThan(dataBase, low)) {
dataBase->addError(tok->linenr());
std::list<const Token*> callstack{tok};
ErrorMessage errmsg(callstack, &tokenizer->list, Severity::SeverityType::error, "bughuntingAssign", "There is assignment, cannot determine that value is greater or equal with " + std::to_string(low), CWE_INCORRECT_CALCULATION, false);
errorLogger->reportErr(errmsg);
}
if (value.isLessThan(dataBase, low))
dataBase->reportError(tok, Severity::SeverityType::error, "bughuntingAssign", "There is assignment, cannot determine that value is greater or equal with " + std::to_string(low), CWE_INCORRECT_CALCULATION, false);
}
MathLib::bigint high;
if (vartok->getCppcheckAttribute(TokenImpl::CppcheckAttributes::Type::HIGH, &high)) {
if (value.isGreaterThan(dataBase, high)) {
dataBase->addError(tok->linenr());
std::list<const Token*> callstack{tok};
ErrorMessage errmsg(callstack, &tokenizer->list, Severity::SeverityType::error, "bughuntingAssign", "There is assignment, cannot determine that value is lower or equal with " + std::to_string(high), CWE_INCORRECT_CALCULATION, false);
errorLogger->reportErr(errmsg);
}
if (value.isGreaterThan(dataBase, high))
dataBase->reportError(tok, Severity::SeverityType::error, "bughuntingAssign", "There is assignment, cannot determine that value is lower or equal with " + std::to_string(high), CWE_INCORRECT_CALCULATION, false);
}
};

13
lib/exprengine.h
View File

@ -22,6 +22,7 @@
//---------------------------------------------------------------------------
#include "config.h"
#include "errortypes.h"
#include <functional>
#include <map>
@ -78,9 +79,15 @@ namespace ExprEngine {
virtual std::string getNewSymbolName() = 0;
const std::string currentFunction;
const Settings * const settings;
virtual void addError(int linenr) {
(void)linenr;
}
virtual void reportError(const Token *tok,
Severity::SeverityType severity,
const char id[],
const std::string &text,
CWE cwe,
bool inconclusive,
bool incomplete=false,
const std::string functionName = std::string()) = 0;
ErrorPath errorPath;
};
class Value {