745 lines
24 KiB
C++
745 lines
24 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2009 Daniel Marjamäki and 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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// Buffer overrun..
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//---------------------------------------------------------------------------
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#include "checkbufferoverrun.h"
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#include "tokenize.h"
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#include "errorlogger.h"
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#include "mathlib.h"
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#include <algorithm>
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#include <sstream>
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#include <list>
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#include <cstring>
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#include <cstdlib> // <- strtoul
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//---------------------------------------------------------------------------
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// Register this check class (by creating a static instance of it)
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namespace
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{
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CheckBufferOverrun instance;
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}
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//---------------------------------------------------------------------------
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void CheckBufferOverrun::arrayIndexOutOfBounds(const Token *tok)
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{
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if (!tok)
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arrayIndexOutOfBounds();
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else
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{
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_callStack.push_back(tok);
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arrayIndexOutOfBounds();
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_callStack.pop_back();
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}
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}
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void CheckBufferOverrun::arrayIndexOutOfBounds()
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{
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reportError(_callStack, Severity::possibleError, "arrayIndexOutOfBounds", "Array index out of bounds");
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}
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void CheckBufferOverrun::bufferOverrun(const Token *tok)
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{
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reportError(tok, Severity::possibleError, "bufferOverrun", "Buffer overrun");
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}
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void CheckBufferOverrun::strncatUsage(const Token *tok)
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{
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reportError(tok, Severity::possibleError, "strncatUsage", "Dangerous usage of strncat. Tip: the 3rd parameter means maximum number of characters to append");
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}
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void CheckBufferOverrun::outOfBounds(const Token *tok, const std::string &what)
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{
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reportError(tok, Severity::error, "outOfBounds", what + " is out of bounds");
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}
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void CheckBufferOverrun::sizeArgumentAsChar(const Token *tok)
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{
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reportError(tok, Severity::possibleError, "sizeArgumentAsChar", "The size argument is given as a char constant");
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}
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//---------------------------------------------------------------------------
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//---------------------------------------------------------------------------
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// Check array usage..
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//---------------------------------------------------------------------------
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void CheckBufferOverrun::checkScope(const Token *tok, const char *varname[], const int size, const int total_size, unsigned int varid)
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{
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unsigned int varc = 0;
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std::string varnames;
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while (varname[varc])
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{
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if (varc > 0)
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varnames += " . ";
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varnames += varname[varc];
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++varc;
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}
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if (varc == 0)
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varc = 1;
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varc = 2 * (varc - 1);
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// Array index..
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if (varid > 0)
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{
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if (Token::Match(tok, "%varid% [ %num% ]", varid))
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{
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const char *num = tok->strAt(2);
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if (std::strtol(num, NULL, 10) >= size)
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{
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arrayIndexOutOfBounds(tok->next());
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}
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}
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}
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else if (Token::Match(tok, std::string(varnames + " [ %num% ]").c_str()))
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{
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const char *num = tok->strAt(2 + varc);
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if (std::strtol(num, NULL, 10) >= size)
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{
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arrayIndexOutOfBounds(tok->next());
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}
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}
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int indentlevel = 0;
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for (; tok; tok = tok->next())
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{
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if (tok->str() == "{")
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{
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++indentlevel;
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}
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else if (tok->str() == "}")
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{
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--indentlevel;
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if (indentlevel < 0)
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return;
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}
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// Array index..
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if (varid > 0)
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{
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if (!tok->isName() && !Token::Match(tok, "[.&]") && Token::Match(tok->next(), "%varid% [ %num% ]", varid))
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{
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const char *num = tok->strAt(3);
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if (std::strtol(num, NULL, 10) >= size)
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{
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arrayIndexOutOfBounds(tok->next());
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}
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}
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}
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else if (!tok->isName() && !Token::Match(tok, "[.&]") && Token::Match(tok->next(), std::string(varnames + " [ %num% ]").c_str()))
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{
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const char *num = tok->next()->strAt(2 + varc);
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if (std::strtol(num, NULL, 10) >= size)
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{
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arrayIndexOutOfBounds(tok->next());
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}
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tok = tok->tokAt(4);
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continue;
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}
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// memset, memcmp, memcpy, strncpy, fgets..
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if (varid > 0)
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{
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if (Token::Match(tok, "memset|memcpy|memmove|memcmp|strncpy|fgets"))
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{
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if (Token::Match(tok->next(), "( %varid% , %any% , %any% )", varid) ||
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Token::Match(tok->next(), "( %var% , %varid% , %any% )", varid))
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{
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const Token *tokSz = tok->tokAt(6);
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if (tokSz->str()[0] == '\'')
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sizeArgumentAsChar(tok);
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else if (tokSz->isNumber())
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{
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const char *num = tok->strAt(6);
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if (std::atoi(num) > total_size)
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{
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bufferOverrun(tok);
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}
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}
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}
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}
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}
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else if (Token::Match(tok, "memset|memcpy|memmove|memcmp|strncpy|fgets"))
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{
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if (Token::Match(tok->next(), std::string("( " + varnames + " , %num% , %num% )").c_str()) ||
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Token::Match(tok->next(), std::string("( %var% , " + varnames + " , %num% )").c_str()))
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{
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const char *num = tok->strAt(varc + 6);
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if (std::atoi(num) > total_size)
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{
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bufferOverrun(tok);
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}
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}
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continue;
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}
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// Loop..
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if (Token::simpleMatch(tok, "for ("))
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{
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const Token *tok2 = tok->tokAt(2);
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unsigned int counter_varid = 0;
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std::string min_counter_value;
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std::string max_counter_value;
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// for - setup..
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if (Token::Match(tok2, "%var% = %any% ;"))
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{
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if (tok2->tokAt(2)->isNumber())
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{
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min_counter_value = tok2->strAt(2);
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}
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counter_varid = tok2->varId();
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tok2 = tok2->tokAt(4);
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}
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else if (Token::Match(tok2, "%type% %var% = %any% ;"))
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{
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if (tok2->tokAt(3)->isNumber())
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{
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min_counter_value = tok2->strAt(3);
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}
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counter_varid = tok2->next()->varId();
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tok2 = tok2->tokAt(5);
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}
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else if (Token::Match(tok2, "%type% %type% %var% = %any% ;"))
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{
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if (tok->tokAt(4)->isNumber())
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{
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min_counter_value = tok2->strAt(4);
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}
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counter_varid = tok2->tokAt(2)->varId();
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tok2 = tok2->tokAt(6);
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}
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else
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continue;
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if (counter_varid)
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{
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if (Token::Match(tok2, "%varid% < %num% ;", counter_varid))
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{
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max_counter_value = MathLib::toString<long>(std::atol(tok2->strAt(2)) - 1);
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}
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else if (Token::Match(tok2, "%varid% <= %num% ;", counter_varid))
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{
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max_counter_value = tok2->strAt(2);
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}
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}
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// Get index variable and stopsize.
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const char *strindex = tok2->str().c_str();
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bool condition_out_of_bounds = true;
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int value = ((tok2->strAt(1)[1] == '=') ? 1 : 0) + std::atoi(tok2->strAt(2));
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if (value <= size)
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condition_out_of_bounds = false;;
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// Goto the end paranthesis of the for-statement: "for (x; y; z)" ..
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tok2 = tok->next()->link();
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if (!tok2 || !tok2->tokAt(5))
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break;
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std::ostringstream pattern;
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pattern << varnames << " [ " << strindex << " ]";
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int indentlevel2 = 0;
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while ((tok2 = tok2->next()))
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{
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if (tok2->str() == ";" && indentlevel2 == 0)
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break;
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if (tok2->str() == "{")
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++indentlevel2;
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if (tok2->str() == "}")
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{
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--indentlevel2;
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if (indentlevel2 <= 0)
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break;
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}
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if (tok2->str() == "if")
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{
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// Bailout
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break;
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}
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if (Token::Match(tok2, pattern.str().c_str()) && condition_out_of_bounds)
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{
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bufferOverrun(tok2);
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break;
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}
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else if (varid > 0 && counter_varid > 0 && !min_counter_value.empty() && !max_counter_value.empty())
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{
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int min_index = 0;
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int max_index = 0;
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if (Token::Match(tok2, "%varid% [ %var% +|-|*|/ %num% ]", varid) &&
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tok2->tokAt(2)->varId() == counter_varid)
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{
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char action = *(tok2->strAt(3));
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const std::string &second(tok2->tokAt(4)->str());
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//printf("min_index: %s %c %s\n", min_counter_value.c_str(), action, second.c_str());
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//printf("max_index: %s %c %s\n", max_counter_value.c_str(), action, second.c_str());
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min_index = std::atoi(MathLib::calculate(min_counter_value, second, action).c_str());
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max_index = std::atoi(MathLib::calculate(max_counter_value, second, action).c_str());
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}
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else if (Token::Match(tok2, "%varid% [ %num% +|-|*|/ %var% ]", varid) &&
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tok2->tokAt(4)->varId() == counter_varid)
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{
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char action = *(tok2->strAt(3));
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const std::string &first(tok2->tokAt(2)->str());
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//printf("min_index: %s %c %s\n", first.c_str(), action, min_counter_value.c_str());
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//printf("max_index: %s %c %s\n", first.c_str(), action, max_counter_value.c_str());
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min_index = std::atoi(MathLib::calculate(first, min_counter_value, action).c_str());
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max_index = std::atoi(MathLib::calculate(first, max_counter_value, action).c_str());
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}
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//printf("min_index = %d, max_index = %d, size = %d\n", min_index, max_index, size);
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if (min_index >= size || max_index >= size)
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{
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arrayIndexOutOfBounds(tok2->next());
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}
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}
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}
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continue;
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}
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// Writing data into array..
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if (Token::Match(tok, ("strcpy|strcat ( " + varnames + " , %str% )").c_str()))
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{
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int len = 0;
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const char *str = tok->strAt(varc + 4);
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while (*str)
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{
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if (*str == '\\')
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++str;
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++str;
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++len;
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}
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if (len > 2 && len >= (int)size + 2)
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{
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bufferOverrun(tok);
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}
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continue;
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}
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// Dangerous usage of strncat..
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if (varid > 0 && Token::Match(tok, "strncat ( %varid% , %any% , %num% )", varid))
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{
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int n = std::atoi(tok->strAt(6));
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if (n >= (size - 1))
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strncatUsage(tok);
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}
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// Dangerous usage of strncpy + strncat..
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if (varid > 0 && Token::Match(tok, "strncpy|strncat ( %varid% , %any% , %num% ) ; strncat ( %varid% , %any% , %num% )", varid))
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{
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int n = std::atoi(tok->strAt(6)) + std::atoi(tok->strAt(15));
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if (n > size)
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strncatUsage(tok->tokAt(9));
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}
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// sprintf..
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if (varid > 0 && Token::Match(tok, "sprintf ( %varid% , %str% [,)]", varid))
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{
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int len = -2;
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// check format string
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const char *fmt = tok->strAt(4);
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while (*fmt)
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{
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if (*fmt == '\\')
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{
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++fmt;
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}
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else if (*fmt == '%')
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{
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// FIXME: better handling for format specifiers
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fmt += 2;
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continue;
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}
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++fmt;
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++len;
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}
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if (len >= (int)size)
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{
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bufferOverrun(tok);
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}
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// check arguments (if they exists)
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if (tok->tokAt(5)->str() == ",")
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{
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len = 0;
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const Token *end = tok->next()->link();
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for (const Token *tok2 = tok->tokAt(6); tok2 && tok2 != end; tok2 = tok2->next())
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{
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if (tok2->str()[0] == '\"')
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{
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len -= 2;
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const char *str = tok2->str().c_str();
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while (*str)
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{
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if (*str == '\\')
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++str;
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++str;
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++len;
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}
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}
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}
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if (len >= (int)size)
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{
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bufferOverrun(tok);
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}
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}
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}
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// snprintf..
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if (varid > 0 && Token::Match(tok, "snprintf ( %varid% , %num% ,", varid))
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{
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int n = std::atoi(tok->strAt(4));
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if (n > size)
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outOfBounds(tok->tokAt(4), "snprintf size");
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}
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// cin..
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if (varid > 0 && Token::Match(tok, "cin >> %varid% ;", varid))
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{
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bufferOverrun(tok);
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}
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// Function call..
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// It's not interesting to check what happens when the whole struct is
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// sent as the parameter, that is checked separately anyway.
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if (Token::Match(tok, "%var% ("))
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{
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// Don't make recursive checking..
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if (std::find(_callStack.begin(), _callStack.end(), tok) != _callStack.end())
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continue;
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// Only perform this checking if showAll setting is enabled..
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if (!_settings->_showAll)
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continue;
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unsigned int parlevel = 0, par = 0;
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for (const Token *tok2 = tok; tok2; tok2 = tok2->next())
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{
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if (tok2->str() == "(")
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{
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++parlevel;
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}
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else if (tok2->str() == ")")
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{
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--parlevel;
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if (parlevel < 1)
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{
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par = 0;
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break;
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}
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}
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else if (parlevel == 1 && (tok2->str() == ","))
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{
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++par;
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}
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if (parlevel == 1 && Token::Match(tok2, std::string("[(,] " + varnames + " [,)]").c_str()))
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{
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++par;
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break;
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}
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}
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if (par == 0)
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continue;
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// Find function..
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const Token *ftok = _tokenizer->getFunctionTokenByName(tok->str().c_str());
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if (!ftok)
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continue;
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// Parse head of function..
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ftok = ftok->tokAt(2);
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parlevel = 1;
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while (ftok && parlevel == 1 && par >= 1)
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{
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if (ftok->str() == "(")
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++parlevel;
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else if (ftok->str() == ")")
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--parlevel;
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else if (ftok->str() == ",")
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--par;
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else if (par == 1 && parlevel == 1 && Token::Match(ftok, "%var% [,)]"))
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{
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// Parameter name..
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const char *parname[2];
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parname[0] = ftok->str().c_str();
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parname[1] = 0;
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// Goto function body..
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while (ftok && (ftok->str() != "{"))
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ftok = ftok->next();
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ftok = ftok ? ftok->next() : 0;
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// Check variable usage in the function..
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_callStack.push_back(tok);
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checkScope(ftok, parname, size, total_size, 0);
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_callStack.pop_back();
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// break out..
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break;
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}
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ftok = ftok->next();
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}
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}
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}
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}
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//---------------------------------------------------------------------------
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// Checking local variables in a scope
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//---------------------------------------------------------------------------
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void CheckBufferOverrun::checkGlobalAndLocalVariable()
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{
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int indentlevel = 0;
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
if (tok->str() == "{")
|
|
++indentlevel;
|
|
|
|
else if (tok->str() == "}")
|
|
--indentlevel;
|
|
|
|
const char *varname[2] = {0};
|
|
unsigned int size = 0;
|
|
const char *type = 0;
|
|
unsigned int varid = 0;
|
|
int nextTok = 0;
|
|
|
|
// if the previous token exists, it must be either a variable name or "[;{}]"
|
|
if (tok->previous() && (!tok->previous()->isName() && !Token::Match(tok->previous(), "[;{}]")))
|
|
continue;
|
|
|
|
if (Token::Match(tok, "%type% *| %var% [ %num% ] [;=]"))
|
|
{
|
|
unsigned int varpos = 1;
|
|
if (tok->next()->str() == "*")
|
|
++varpos;
|
|
varname[0] = tok->strAt(varpos);
|
|
size = std::strtoul(tok->strAt(varpos + 2), NULL, 10);
|
|
type = tok->strAt(varpos - 1);
|
|
varid = tok->tokAt(varpos)->varId();
|
|
nextTok = varpos + 5;
|
|
}
|
|
else if (indentlevel > 0 && Token::Match(tok, "[*;{}] %var% = new %type% [ %num% ]"))
|
|
{
|
|
varname[0] = tok->strAt(1);
|
|
size = std::strtoul(tok->strAt(6), NULL, 10);
|
|
type = tok->strAt(4);
|
|
varid = tok->tokAt(1)->varId();
|
|
nextTok = 8;
|
|
}
|
|
else if (indentlevel > 0 && Token::Match(tok, "[*;{}] %var% = malloc ( %num% ) ;"))
|
|
{
|
|
varname[0] = tok->strAt(1);
|
|
size = std::strtoul(tok->strAt(5), NULL, 10);
|
|
type = "char";
|
|
varid = tok->tokAt(1)->varId();
|
|
nextTok = 7;
|
|
}
|
|
else
|
|
{
|
|
continue;
|
|
}
|
|
|
|
int total_size = size * ((*type == '*') ? 4 : _tokenizer->sizeOfType(type));
|
|
if (total_size == 0)
|
|
continue;
|
|
|
|
// The callstack is empty
|
|
_callStack.clear();
|
|
checkScope(tok->tokAt(nextTok), varname, size, total_size, varid);
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Checking member variables of structs..
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckBufferOverrun::checkStructVariable()
|
|
{
|
|
const char declstruct[] = "struct|class %var% {";
|
|
for (const Token *tok = Token::findmatch(_tokenizer->tokens(), declstruct);
|
|
tok; tok = Token::findmatch(tok->next(), declstruct))
|
|
{
|
|
const std::string &structname = tok->next()->str();
|
|
|
|
// Found a struct declaration. Search for arrays..
|
|
for (const Token *tok2 = tok->tokAt(2); tok2; tok2 = tok2->next())
|
|
{
|
|
if (tok2->str() == "}")
|
|
break;
|
|
|
|
int ivar = 0;
|
|
if (Token::Match(tok2->next(), "%type% %var% [ %num% ] ;"))
|
|
ivar = 2;
|
|
else if (Token::Match(tok2->next(), "%type% %type% %var% [ %num% ] ;"))
|
|
ivar = 3;
|
|
else if (Token::Match(tok2->next(), "%type% * %var% [ %num% ] ;"))
|
|
ivar = 3;
|
|
else if (Token::Match(tok2->next(), "%type% %type% * %var% [ %num% ] ;"))
|
|
ivar = 4;
|
|
else
|
|
continue;
|
|
|
|
const char *varname[3] = {0, 0, 0};
|
|
varname[1] = tok2->strAt(ivar);
|
|
int arrsize = std::atoi(tok2->strAt(ivar + 2));
|
|
int total_size = arrsize * _tokenizer->sizeOfType(tok2->strAt(1));
|
|
if (total_size == 0)
|
|
continue;
|
|
|
|
|
|
// Class member variable => Check functions
|
|
if (tok->str() == "class")
|
|
{
|
|
std::string func_pattern(structname + " :: %var% (");
|
|
const Token *tok3 = Token::findmatch(_tokenizer->tokens(), func_pattern.c_str());
|
|
while (tok3)
|
|
{
|
|
for (const Token *tok4 = tok3; tok4; tok4 = tok4->next())
|
|
{
|
|
if (Token::Match(tok4, "[;{}]"))
|
|
break;
|
|
|
|
if (Token::simpleMatch(tok4, ") {"))
|
|
{
|
|
const char *names[2] = {varname[1], 0};
|
|
checkScope(tok4->tokAt(2), names, arrsize, total_size, 0);
|
|
break;
|
|
}
|
|
}
|
|
tok3 = Token::findmatch(tok3->next(), func_pattern.c_str());
|
|
}
|
|
}
|
|
|
|
for (const Token *tok3 = _tokenizer->tokens(); tok3; tok3 = tok3->next())
|
|
{
|
|
if (tok3->str() != structname)
|
|
continue;
|
|
|
|
// Declare variable: Fred fred1;
|
|
if (Token::Match(tok3->next(), "%var% ;"))
|
|
varname[0] = tok3->strAt(1);
|
|
|
|
// Declare pointer: Fred *fred1
|
|
else if (Token::Match(tok3->next(), "* %var% [,);=]"))
|
|
varname[0] = tok3->strAt(2);
|
|
|
|
else
|
|
continue;
|
|
|
|
|
|
// Goto end of statement.
|
|
const Token *CheckTok = NULL;
|
|
while (tok3)
|
|
{
|
|
// End of statement.
|
|
if (tok3->str() == ";")
|
|
{
|
|
CheckTok = tok3;
|
|
break;
|
|
}
|
|
|
|
// End of function declaration..
|
|
if (Token::simpleMatch(tok3, ") ;"))
|
|
break;
|
|
|
|
// Function implementation..
|
|
if (Token::simpleMatch(tok3, ") {"))
|
|
{
|
|
CheckTok = tok3->tokAt(2);
|
|
break;
|
|
}
|
|
|
|
tok3 = tok3->next();
|
|
}
|
|
|
|
if (!tok3)
|
|
break;
|
|
|
|
if (!CheckTok)
|
|
continue;
|
|
|
|
// Check variable usage..
|
|
checkScope(CheckTok, varname, arrsize, total_size, 0);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckBufferOverrun::bufferOverrun()
|
|
{
|
|
checkGlobalAndLocalVariable();
|
|
checkStructVariable();
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
|