1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178
|
/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2025 Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
//---------------------------------------------------------------------------
// 64-bit portability
//---------------------------------------------------------------------------
#include "check64bit.h"
#include "errortypes.h"
#include "settings.h"
#include "symboldatabase.h"
#include "token.h"
#include "tokenize.h"
#include <vector>
//---------------------------------------------------------------------------
// CWE ids used
static const CWE CWE758(758U); // Reliance on Undefined, Unspecified, or Implementation-Defined Behavior
// Register this check class (by creating a static instance of it)
namespace {
Check64BitPortability instance;
}
void Check64BitPortability::pointerassignment()
{
if (!mSettings->severity.isEnabled(Severity::portability))
return;
logChecker("Check64BitPortability::pointerassignment"); // portability
const SymbolDatabase *symbolDatabase = mTokenizer->getSymbolDatabase();
// Check return values
for (const Scope * scope : symbolDatabase->functionScopes) {
if (scope->function == nullptr || !scope->function->hasBody()) // We only look for functions with a body
continue;
bool retPointer = false;
if (scope->function->token->strAt(-1) == "*") // Function returns a pointer
retPointer = true;
else if (Token::Match(scope->function->token->previous(), "int|long|DWORD")) // Function returns an integer
;
else
continue;
for (const Token* tok = scope->bodyStart->next(); tok != scope->bodyEnd; tok = tok->next()) {
// skip nested functions
if (tok->str() == "{") {
if (tok->scope()->type == Scope::ScopeType::eFunction || tok->scope()->type == Scope::ScopeType::eLambda)
tok = tok->link();
}
if (tok->str() != "return")
continue;
if (!tok->astOperand1() || tok->astOperand1()->isNumber())
continue;
const ValueType * const returnType = tok->astOperand1()->valueType();
if (!returnType)
continue;
if (retPointer && !returnType->typeScope && returnType->pointer == 0U)
returnIntegerError(tok);
if (!retPointer && returnType->pointer >= 1U)
returnPointerError(tok);
}
}
// Check assignments
for (const Scope * scope : symbolDatabase->functionScopes) {
for (const Token *tok = scope->bodyStart; tok && tok != scope->bodyEnd; tok = tok->next()) {
if (tok->str() != "=")
continue;
const ValueType *lhstype = tok->astOperand1() ? tok->astOperand1()->valueType() : nullptr;
const ValueType *rhstype = tok->astOperand2() ? tok->astOperand2()->valueType() : nullptr;
if (!lhstype || !rhstype)
continue;
// Assign integer to pointer..
if (lhstype->pointer >= 1U &&
!tok->astOperand2()->isNumber() &&
rhstype->pointer == 0U &&
rhstype->originalTypeName.empty() &&
rhstype->type == ValueType::Type::INT)
assignmentIntegerToAddressError(tok);
// Assign pointer to integer..
if (rhstype->pointer >= 1U &&
lhstype->pointer == 0U &&
lhstype->originalTypeName.empty() &&
lhstype->isIntegral() &&
lhstype->type >= ValueType::Type::CHAR &&
lhstype->type <= ValueType::Type::INT)
assignmentAddressToIntegerError(tok);
}
}
}
void Check64BitPortability::assignmentAddressToIntegerError(const Token *tok)
{
reportError(tok, Severity::portability,
"AssignmentAddressToInteger",
"Assigning a pointer to an integer is not portable.\n"
"Assigning a pointer to an integer (int/long/etc) is not portable across different platforms and "
"compilers. For example in 32-bit Windows and linux they are same width, but in 64-bit Windows and linux "
"they are of different width. In worst case you end up assigning 64-bit address to 32-bit integer. The safe "
"way is to store addresses only in pointer types (or typedefs like uintptr_t).", CWE758, Certainty::normal);
}
void Check64BitPortability::assignmentIntegerToAddressError(const Token *tok)
{
reportError(tok, Severity::portability,
"AssignmentIntegerToAddress",
"Assigning an integer to a pointer is not portable.\n"
"Assigning an integer (int/long/etc) to a pointer is not portable across different platforms and "
"compilers. For example in 32-bit Windows and linux they are same width, but in 64-bit Windows and linux "
"they are of different width. In worst case you end up assigning 64-bit integer to 32-bit pointer. The safe "
"way is to store addresses only in pointer types (or typedefs like uintptr_t).", CWE758, Certainty::normal);
}
void Check64BitPortability::returnPointerError(const Token *tok)
{
reportError(tok, Severity::portability,
"CastAddressToIntegerAtReturn",
"Returning an address value in a function with integer return type is not portable.\n"
"Returning an address value in a function with integer (int/long/etc) return type is not portable across "
"different platforms and compilers. For example in 32-bit Windows and Linux they are same width, but in "
"64-bit Windows and Linux they are of different width. In worst case you end up casting 64-bit address down "
"to 32-bit integer. The safe way is to always return an integer.", CWE758, Certainty::normal);
}
void Check64BitPortability::returnIntegerError(const Token *tok)
{
reportError(tok, Severity::portability,
"CastIntegerToAddressAtReturn",
"Returning an integer in a function with pointer return type is not portable.\n"
"Returning an integer (int/long/etc) in a function with pointer return type is not portable across different "
"platforms and compilers. For example in 32-bit Windows and Linux they are same width, but in 64-bit Windows "
"and Linux they are of different width. In worst case you end up casting 64-bit integer down to 32-bit pointer. "
"The safe way is to always return a pointer.", CWE758, Certainty::normal);
}
void Check64BitPortability::runChecks(const Tokenizer &tokenizer, ErrorLogger *errorLogger)
{
Check64BitPortability check64BitPortability(&tokenizer, &tokenizer.getSettings(), errorLogger);
check64BitPortability.pointerassignment();
}
void Check64BitPortability::getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) const
{
Check64BitPortability c(nullptr, settings, errorLogger);
c.assignmentAddressToIntegerError(nullptr);
c.assignmentIntegerToAddressError(nullptr);
c.returnIntegerError(nullptr);
c.returnPointerError(nullptr);
}
|