111 lines
3.7 KiB
C++
111 lines
3.7 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2019 Cppcheck team.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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//---------------------------------------------------------------------------
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#ifndef checkbufferoverrunH
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#define checkbufferoverrunH
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//---------------------------------------------------------------------------
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#include "check.h"
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#include "config.h"
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#include "errorlogger.h"
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#include "mathlib.h"
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#include "tokenize.h"
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#include <cstddef>
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#include <list>
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#include <map>
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#include <string>
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#include <vector>
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/// @addtogroup Checks
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/// @{
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/**
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* @brief buffer overruns and array index out of bounds
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*
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* Buffer overrun and array index out of bounds are pretty much the same.
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* But I generally use 'array index' if the code contains []. And the given
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* index is out of bounds.
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* I generally use 'buffer overrun' if you for example call a strcpy or
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* other function and pass a buffer and reads or writes too much data.
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*/
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class CPPCHECKLIB CheckBufferOverrun : public Check {
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public:
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/** This constructor is used when registering the CheckClass */
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CheckBufferOverrun() : Check(myName()) {
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}
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/** This constructor is used when running checks. */
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CheckBufferOverrun(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
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: Check(myName(), tokenizer, settings, errorLogger) {
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}
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void runChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) OVERRIDE {
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CheckBufferOverrun checkBufferOverrun(tokenizer, settings, errorLogger);
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checkBufferOverrun.arrayIndex();
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checkBufferOverrun.bufferOverflow();
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checkBufferOverrun.arrayIndexThenCheck();
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}
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void runSimplifiedChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) OVERRIDE {
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(void)tokenizer;
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(void)settings;
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(void)errorLogger;
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}
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void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) const OVERRIDE {
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CheckBufferOverrun c(nullptr, settings, errorLogger);
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c.arrayIndexError(nullptr, nullptr, nullptr);
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c.negativeIndexError(nullptr, nullptr, nullptr);
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c.arrayIndexThenCheckError(nullptr, "i");
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}
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private:
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void arrayIndex();
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void arrayIndexError(const Token *tok, const Variable *var, const ValueFlow::Value *index);
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void negativeIndexError(const Token *tok, const Variable *var, const ValueFlow::Value *negativeValue);
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void bufferOverflow();
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void bufferOverflowError(const Token *tok);
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void arrayIndexThenCheck();
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void arrayIndexThenCheckError(const Token *tok, const std::string &indexName);
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size_t getBufferSize(const Token *bufTok) const;
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static std::string myName() {
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return "Bounds checking";
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}
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std::string classInfo() const OVERRIDE {
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return "Out of bounds checking:\n"
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"- Array index out of bounds\n"
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"- Buffer overflow\n"
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"- Dangerous usage of strncat()\n"
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"- Using array index before checking it\n";
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}
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};
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/// @}
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//---------------------------------------------------------------------------
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#endif // checkbufferoverrunH
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