/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2009 Daniel Marjamäki and 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/>.
*/
#include "tokenize.h"
#include "checkbufferoverrun.h"
#include "testsuite.h"
#include <sstream>
extern std::ostringstream errout;
class TestBufferOverrun : public TestFixture
{
public:
TestBufferOverrun() : TestFixture("TestBufferOverrun")
{ }
private:
void check(const char code[], bool showAll = true)
{
// Tokenize..
Tokenizer tokenizer;
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
// Assign variable ids
tokenizer.simplifyTokenList();
// Fill function list
tokenizer.fillFunctionList();
// Clear the error buffer..
errout.str("");
// Check for buffer overruns..
Settings settings;
settings._showAll = showAll;
settings._checkCodingStyle = true;
CheckBufferOverrun checkBufferOverrun(&tokenizer, &settings, this);
checkBufferOverrun.bufferOverrun();
}
void run()
{
TEST_CASE(noerr1);
TEST_CASE(noerr2);
TEST_CASE(noerr3);
TEST_CASE(noerr4);
TEST_CASE(sizeof1);
TEST_CASE(sizeof2);
TEST_CASE(sizeof3);
TEST_CASE(array_index_1);
TEST_CASE(array_index_2);
TEST_CASE(array_index_3);
TEST_CASE(array_index_4);
TEST_CASE(array_index_5);
TEST_CASE(array_index_6);
TEST_CASE(array_index_7);
TEST_CASE(array_index_8);
TEST_CASE(array_index_9);
TEST_CASE(array_index_10);
TEST_CASE(array_index_11);
TEST_CASE(array_index_12);
TEST_CASE(array_index_13);
TEST_CASE(array_index_14);
TEST_CASE(array_index_15);
TEST_CASE(array_index_16);
TEST_CASE(array_index_17);
TEST_CASE(array_index_18);
TEST_CASE(array_index_19);
TEST_CASE(array_index_20);
TEST_CASE(array_index_21);
TEST_CASE(array_index_22);
TEST_CASE(array_index_multidim);
TEST_CASE(array_index_switch_in_for);
TEST_CASE(array_index_calculation);
TEST_CASE(array_index_negative);
TEST_CASE(array_index_for_decr);
TEST_CASE(buffer_overrun_1);
TEST_CASE(buffer_overrun_2);
TEST_CASE(buffer_overrun_3);
TEST_CASE(buffer_overrun_4);
TEST_CASE(buffer_overrun_5);
TEST_CASE(buffer_overrun_6);
TEST_CASE(buffer_overrun_7);
TEST_CASE(buffer_overrun_8);
TEST_CASE(buffer_overrun_9);
TEST_CASE(buffer_overrun_10);
TEST_CASE(buffer_overrun_11);
TEST_CASE(buffer_overrun_12);
TEST_CASE(sprintf1);
TEST_CASE(sprintf2);
TEST_CASE(sprintf3);
TEST_CASE(sprintf4);
TEST_CASE(sprintf5);
TEST_CASE(sprintf6);
TEST_CASE(snprintf1);
TEST_CASE(snprintf2);
TEST_CASE(snprintf3);
TEST_CASE(snprintf4);
TEST_CASE(strncat1);
TEST_CASE(strncat2);
TEST_CASE(cin1);
TEST_CASE(varid1);
TEST_CASE(varid2);
TEST_CASE(assign1);
TEST_CASE(alloc); // Buffer allocated with new
TEST_CASE(memset1);
TEST_CASE(memset2);
TEST_CASE(counter_test);
TEST_CASE(strncpy1);
TEST_CASE(unknownType);
TEST_CASE(terminateStrncpy1);
TEST_CASE(terminateStrncpy2);
}
void noerr1()
{
check("extern int ab;\n"
"void f()\n"
"{\n"
" if (ab)\n"
" {\n"
" char str[50];\n"
" }\n"
" if (ab)\n"
" {\n"
" char str[50];\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void noerr2()
{
check("static char buf[2];\n"
"void f1(char *str)\n"
"{\n"
" strcpy(buf,str);\n"
"}\n"
"void f2(char *str)\n"
"{\n"
" strcat(buf,str);\n"
"}\n"
"void f3(char *str)\n"
"{\n"
" sprintf(buf,\"%s\",str);\n"
"}\n"
"void f4(const char str[])\n"
"{\n"
" strcpy(buf, str);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void noerr3()
{
check("struct { char data[10]; } abc;\n"
"static char f()\n"
"{\n"
" char data[1];\n"
" return abc.data[1];\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void noerr4()
{
// The memory isn't read or written and therefore there is no error.
check("static void f()\n"
"{\n"
" char data[100];\n"
" const char *p = &data[100];\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void sizeof1()
{
check("static void f()\n"
"{\n"
" char data[10];\n"
" data[ sizeof(*data) ] = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void sizeof2()
{
check("static void f()\n"
"{\n"
" char data[10];\n"
" data[ sizeof(data[0]) ] = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("static void f()\n"
"{\n"
" int data[2];\n"
" data[ sizeof(data[0]) ] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'data[2]' index 4 out of bounds\n", errout.str());
}
void sizeof3()
{
check("struct group { int gr_gid; };\n"
"void f()\n"
"{\n"
" char group[32];\n"
" snprintf(group, sizeof(group), \"%u\", 0);\n"
" struct group *gr;\n"
" snprintf(group, sizeof(group), \"%u\", gr->gr_gid);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void array_index_1()
{
check("void f()\n"
"{\n"
" char str[0x10];\n"
" str[15] = 0;\n"
" str[16] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'str[16]' index 16 out of bounds\n", errout.str());
check("char f()\n"
"{\n"
" char str[16];\n"
" return str[16];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'str[16]' index 16 out of bounds\n", errout.str());
}
void array_index_2()
{
check("void f()\n"
"{\n"
" char *str = new char[0x10];\n"
" str[15] = 0;\n"
" str[16] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'str[16]' index 16 out of bounds\n", errout.str());
}
void array_index_3()
{
{
check("void f()\n"
"{\n"
" int val[50];\n"
" int i, sum=0;\n"
" for (i = 0; i < 100; i++)\n"
" sum += val[i];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Buffer access out-of-bounds\n", errout.str());
}
{
check("void f()\n"
"{\n"
" int val[50];\n"
" int i, sum=0;\n"
" for (i = 1; i < 100; i++)\n"
" sum += val[i];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Buffer access out-of-bounds\n", errout.str());
}
{
check("void f(int a)\n"
"{\n"
" int val[50];\n"
" int i, sum=0;\n"
" for (i = a; i < 100; i++)\n"
" sum += val[i];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Buffer access out-of-bounds\n", errout.str());
}
{
check("typedef struct g g2[3];\n"
"void foo(char *a)\n"
"{\n"
" for (int i = 0; i < 4; i++)\n"
" {\n"
" a[i]=0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
{
check("void foo(int argc)\n"
"{\n"
" char a[2];\n"
" for (int i = 4; i < argc; i++)\n"
" {\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
}
void array_index_4()
{
check("const int SIZE = 10;\n"
"void f()\n"
"{\n"
" int i[SIZE];\n"
" i[SIZE] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'i[10]' index 10 out of bounds\n", errout.str());
}
void array_index_5()
{
check("void f()\n"
"{\n"
" int i[10];\n"
" i[ sizeof(i) - 1 ] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'i[10]' index 39 out of bounds\n", errout.str());
}
void array_index_6()
{
check("struct ABC\n"
"{\n"
" char str[10];\n"
"};\n"
"\n"
"static void f()\n"
"{\n"
" struct ABC abc;\n"
" abc.str[10] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:9]: (error) Array 'str[10]' index 10 out of bounds\n", errout.str());
// This is not out of bounds
check("struct ABC\n"
"{\n"
" char str[1];\n"
"};\n"
"\n"
"static void f()\n"
"{\n"
" int datasize = 10;\n"
" struct ABC* x = (struct ABC *)malloc(sizeof(struct ABC) + datasize - 1);\n"
" x->str[1] = 0;"
"}\n");
ASSERT_EQUALS("[test.cpp:10]: (possible error) Array 'str[1]' index 1 out of bounds\n", errout.str());
TODO_ASSERT_EQUALS("", errout.str());
}
void array_index_7()
{
check("struct ABC\n"
"{\n"
" char str[10];\n"
"};\n"
"\n"
"static void f(struct ABC *abc)\n"
"{\n"
" abc->str[10] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8]: (error) Array 'str[10]' index 10 out of bounds\n", errout.str());
}
void array_index_8()
{
check("const int SIZE = 10;\n"
"\n"
"struct ABC\n"
"{\n"
" char str[SIZE];\n"
"};\n"
"\n"
"static void f()\n"
"{\n"
" struct ABC abc;\n"
" abc.str[SIZE] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:11]: (error) Array 'str[10]' index 10 out of bounds\n", errout.str());
}
void array_index_9()
{
check("static void memclr( char *data )\n"
"{\n"
" data[10] = 0;\n"
"}\n"
"\n"
"static void f()\n"
"{\n"
" char str[5];\n"
" memclr( str ); // ERROR\n"
"}\n");
ASSERT_EQUALS("[test.cpp:9] -> [test.cpp:3]: (possible error) Array index out of bounds\n", errout.str());
check("static void memclr( int i, char *data )\n"
"{\n"
" data[10] = 0;\n"
"}\n"
"\n"
"static void f()\n"
"{\n"
" char str[5];\n"
" memclr( 0, str ); // ERROR\n"
"}\n");
ASSERT_EQUALS("[test.cpp:9] -> [test.cpp:3]: (possible error) Array index out of bounds\n", errout.str());
check("static void memclr( int i, char *data )\n"
"{\n"
" data[i] = 0;\n"
"}\n"
"\n"
"static void f()\n"
"{\n"
" char str[5];\n"
" memclr( 10, str ); // ERROR\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:9] -> [test.cpp:3]: (possible error) Array index out of bounds\n", errout.str());
// This is not an error
check("static void memclr( char *data, int size )\n"
"{\n"
" if( size > 10 )"
" data[10] = 0;\n"
"}\n"
"\n"
"static void f()\n"
"{\n"
" char str[5];\n"
" memclr( str, 5 ); // ERROR\n"
"}\n");
ASSERT_EQUALS("[test.cpp:9] -> [test.cpp:3]: (possible error) Array index out of bounds\n", errout.str());
TODO_ASSERT_EQUALS("", errout.str());
}
void array_index_10()
{
check("struct ABC\n"
"{\n"
" char str[10];\n"
"};\n"
"\n"
"static void memclr( char *data )\n"
"{\n"
" data[10] = 0;\n"
"}\n"
"\n"
"static void f(struct ABC *abc)\n"
"{\n"
" memclr(abc->str);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:13] -> [test.cpp:8]: (possible error) Array index out of bounds\n", errout.str());
}
void array_index_11()
{
check("class ABC\n"
"{\n"
"public:\n"
" ABC();\n"
" char *str[10];\n"
" struct ABC *next();"
"};\n"
"\n"
"static void f()\n"
"{\n"
" ABC *abc1;\n"
" for ( ABC *abc = abc1; abc; abc = abc->next() )\n"
" {\n"
" abc->str[10] = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:13]: (error) Array 'str[10]' index 10 out of bounds\n", errout.str());
}
void array_index_12()
{
check("class Fred\n"
"{\n"
"private:\n"
" char str[10];\n"
"public:\n"
" Fred();\n"
"};\n"
"Fred::Fred()\n"
"{\n"
" str[10] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:10]: (error) Array 'str[10]' index 10 out of bounds\n", errout.str());
check("class Fred\n"
"{\n"
"private:\n"
" char str[10];\n"
"public:\n"
" char c();\n"
"};\n"
"char Fred::c()\n"
"{\n"
" return str[10];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:10]: (error) Array 'str[10]' index 10 out of bounds\n", errout.str());
}
void array_index_13()
{
check("void f()\n"
"{\n"
" char buf[10];\n"
" for (int i = 0; i < 100; i++)\n"
" {\n"
" if (i < 10)\n"
" int x = buf[i];\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void array_index_14()
{
check("void f()\n"
"{\n"
" int a[10];\n"
" for (int i = 0; i < 10; i++)\n"
" a[i+10] = i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'a[10]' index 19 out of bounds\n", errout.str());
}
void array_index_15()
{
check("void f()\n"
"{\n"
" int a[10];\n"
" for (int i = 0; i < 10; i++)\n"
" a[10+i] = i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'a[10]' index 19 out of bounds\n", errout.str());
}
void array_index_16()
{
check("void f()\n"
"{\n"
" int a[10];\n"
" for (int i = 0; i < 10; i++)\n"
" a[i+1] = i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'a[10]' index 10 out of bounds\n", errout.str());
}
void array_index_17()
{
check("void f()\n"
"{\n"
" int a[10];\n"
" for (int i = 0; i < 10; i++)\n"
" a[i*2] = i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'a[10]' index 18 out of bounds\n", errout.str());
check("void f()\n"
"{\n"
" int a[12];\n"
" for (int i = 0; i < 12; i+=6)\n"
" a[i+5] = i;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" int a[12];\n"
" for (int i = 0; i < 12; i+=6)\n"
" a[i+6] = i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'a[12]' index 12 out of bounds\n", errout.str());
}
void array_index_18()
{
check("void f()\n"
"{\n"
" int a[5];\n"
" for (int i = 0; i < 6; i++)\n"
" {\n"
" a[i] = i;\n"
" i+=1;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" int a[5];\n"
" for (int i = 0; i < 6; i++)\n"
" {\n"
" a[i] = i;\n"
" i++;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" int a[5];\n"
" for (int i = 0; i < 6; i++)\n"
" {\n"
" a[i] = i;\n"
" ++i;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" int a[5];\n"
" for (int i = 0; i < 6; i++)\n"
" {\n"
" a[i] = i;\n"
" i=4;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" int a[6];\n"
" for (int i = 0; i < 7; i++)\n"
" {\n"
" a[i] = i;\n"
" i+=1;\n"
" }\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:6]: (error) Buffer overrun\n", errout.str());
}
void array_index_19()
{
// "One Past the End" is legal, as long as pointer is not dereferenced.
check("void f()\n"
"{\n"
" char a[2];\n"
" char *end = &(a[2]);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// Getting more than one past the end is not legal
check("void f()\n"
"{\n"
" char a[2];\n"
" char *end = &(a[3]);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[2]' index 3 out of bounds\n", errout.str());
}
void array_index_20()
{
check("void f()\n"
"{\n"
" char a[8];\n"
" int b[10];\n"
" for ( int i = 0; i < 9; i++ )\n"
" b[i] = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void array_index_21()
{
check("class A {\n"
" int indices[2];\n"
" void foo(int indices[3]);\n"
"};\n"
"\n"
"void A::foo(int indices[3]) {\n"
" for(int j=0; j<3; ++j) {\n"
" int b = indices[j];\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void array_index_22()
{
check("#include <cstring>\n"
"int main() {\n"
" size_t indices[2];\n"
" int b = indices[2];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'indices[2]' index 2 out of bounds\n", errout.str());
}
void array_index_multidim()
{
check("void f()\n"
"{\n"
" char a[2][2];\n"
" a[1][1] = 'a';\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char a[2][2][2];\n"
" a[1][1][1] = 'a';\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char a[2][2];\n"
" a[2][1] = 'a';\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Array index out of bounds\n", errout.str());
check("void f()\n"
"{\n"
" char a[2][2];\n"
" a[1][2] = 'a';\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Array index out of bounds\n", errout.str());
check("void f()\n"
"{\n"
" char a[2][2][2];\n"
" a[2][1][1] = 'a';\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Array index out of bounds\n", errout.str());
check("void f()\n"
"{\n"
" char a[2][2][2];\n"
" a[1][2][1] = 'a';\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Array index out of bounds\n", errout.str());
check("void f()\n"
"{\n"
" char a[2][2][2];\n"
" a[1][1][2] = 'a';\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Array index out of bounds\n", errout.str());
check("void f()\n"
"{\n"
" char a[2][2][2];\n"
" a[1][1][2] = 'a';\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Array index out of bounds\n", errout.str());
}
void array_index_switch_in_for()
{
check("void f()\n"
"{\n"
" int ar[10];\n"
" for (int i = 0; i < 10; ++i)\n"
" {\n"
" switch(i)\n"
" {\n"
" case 9:\n"
" ar[i] = 0;\n"
" break;\n"
" default:\n"
" ar[i] = ar[i+1];\n"
" break;\n"
" };\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" int ar[10];\n"
" for (int i = 0; i < 10; ++i)\n"
" {\n"
" switch(i)\n"
" {\n"
" case 8:\n"
" ar[i] = 0;\n"
" break;\n"
" default:\n"
" ar[i] = ar[i+1];\n"
" break;\n"
" };\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
TODO_ASSERT_EQUALS("[test.cpp:12]: (error) Array index out of bounds\n", errout.str());
}
void array_index_calculation()
{
// #1193 - false negative: array out of bounds in loop when there is calculation
check("void f()\n"
"{\n"
" char data[8];\n"
" for (int i = 19; i < 36; ++i) {\n"
" data[(i-0)/2] = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
TODO_ASSERT_EQUALS("[test.cpp:5]: (error) Array index out of bounds\n", errout.str());
}
void array_index_negative()
{
// #948 - array index out of bound not detected 'a[-1] = 0'
check("void f()\n"
"{\n"
" char data[8];\n"
" data[-1] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'data[8]' index -1 out of bounds\n", errout.str());
}
void array_index_for_decr()
{
check("void f()\n"
"{\n"
" char data[8];\n"
" for (int i = 10; i > 0; --i) {\n"
" data[i] = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Buffer access out-of-bounds\n", errout.str());
}
void buffer_overrun_1()
{
check("void f()\n"
"{\n"
" char str[3];\n"
" strcpy(str, \"abc\");\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds\n", errout.str());
check("void f(int fd)\n"
"{\n"
" char str[3];\n"
" read(fd, str, 3);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(int fd)\n"
"{\n"
" char str[3];\n"
" read(fd, str, 4);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds\n", errout.str());
check("void f(int fd)\n"
"{\n"
" char str[3];\n"
" write(fd, str, 3);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(int fd)\n"
"{\n"
" char str[3];\n"
" write(fd, str, 4);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds\n", errout.str());
check("void f()\n"
"{\n"
" long bb[2];\n"
" write(stdin, bb, sizeof(bb));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char str[3];\n"
" fgets(str, 3, stdin);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char str[3];\n"
" fgets(str, 4, stdin);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds\n", errout.str());
}
void buffer_overrun_2()
{
check("struct ABC\n"
"{\n"
" char str[5];\n"
"};\n"
"\n"
"static void f(struct ABC *abc)\n"
"{\n"
" strcpy( abc->str, \"abcdef\" );\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8]: (error) Buffer access out-of-bounds\n", errout.str());
}
void buffer_overrun_3()
{
check("int a[10];\n"
"\n"
"void foo()\n"
"{\n"
" int i;\n"
" for (i = 0; i <= 10; ++i)\n"
" a[i] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (error) Buffer access out-of-bounds\n", errout.str());
}
void buffer_overrun_4()
{
check("void foo()\n"
"{\n"
" const char *p[2];\n"
" for (int i = 0; i < 8; ++i)\n"
" p[i] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Buffer access out-of-bounds\n", errout.str());
// No false positive
check("void foo(int x, int y)\n"
"{\n"
" const char *p[2];\n"
" const char *s = y + p[1];\n"
" p[1] = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// There is no error here
check("void f1(char *s,int size)\n"
"{\n"
" if( size > 10 ) strcpy(s,\"abc\");\n"
"}\n"
"void f2()\n"
"{\n"
" char s[3];\n"
" f1(s,3);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (possible error) Buffer access out-of-bounds\n", errout.str());
TODO_ASSERT_EQUALS("", errout.str());
check("void f1(char *s,int size)\n"
"{\n"
" if( size > 10 ) strcpy(s,\"abc\");\n"
"}\n"
"void f2()\n"
"{\n"
" char s[3];\n"
" f1(s,3);\n"
"}\n", false);
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_5()
{
check("void f()\n"
"{\n"
" char n[5];\n"
" sprintf(n, \"d\");\n"
" printf(\"hello!\");\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_6()
{
check("void f()\n"
"{\n"
" char n[5];\n"
" strcat(n, \"abc\");\n"
" strcat(n, \"def\");\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Buffer access out-of-bounds\n", errout.str());
check("void f()\n"
"{\n"
" char n[5];\n"
" strcat(strcat(n, \"abc\"), \"def\");\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds\n", errout.str());
}
void buffer_overrun_7()
{
// ticket #731
check("void f()\n"
"{\n"
" char a[2];\n"
" strcpy(a, \"a\\0\");\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_8()
{
// ticket #714
check("void f()\n"
"{\n"
" char a[5];\n"
" for (int i = 0; i < 20; i+= 100)\n"
" {\n"
" a[i] = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char a[5];\n"
" for (int i = 0; i < 20; i = i + 100)\n"
" {\n"
" a[i] = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char a[5];\n"
" for (int i = 0; i < 20; i = 100 + i)\n"
" {\n"
" a[i] = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_9()
{
// ticket #738
check("void f()\n"
"{\n"
" char a[5];\n"
" for (int i = 0; i < 20; )\n"
" {\n"
" a[i] = 0;\n"
" i += 100;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_10()
{
// ticket #740
check("void f()\n"
"{\n"
" char a[4];\n"
" for (int i = 0; i < 4; i++)\n"
" {\n"
" char b = a[i];\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_11()
{
check("void f()\n"
"{\n"
" char a[4];\n"
" for (float i=0; i<10.0;i+=0.1)\n"
" {\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char a[4];\n"
" for (float i=0; i<10.0;i=i+0.1)\n"
" {\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char a[4];\n"
" for (float i=0; i<10.0;i=0.1+i)\n"
" {\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_12()
{
// ticket #900
check("void f() {\n"
" char *a = new char(30);\n"
" sprintf(a, \"%s\", \"b\");\n"
" delete a;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer access out-of-bounds\n", errout.str());
}
void sprintf1()
{
check("void f()\n"
"{\n"
" char str[3];\n"
" sprintf(str, \"%s\", \"abc\");\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds\n", errout.str());
check("void f()\n"
"{\n"
" char * c = new char[10];\n"
" sprintf(c, \"%s\", \"/usr/LongLongLongLongUserName/bin/LongLongApplicationName\");\n"
" delete [] c;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds\n", errout.str());
}
void sprintf2()
{
check("int getnumber();\n"
"void f()\n"
"{\n"
" char str[5];\n"
" sprintf(str, \"%d: %s\", getnumber(), \"abcde\");\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Buffer access out-of-bounds\n", errout.str());
}
void sprintf3()
{
check("void f()\n"
"{\n"
" char str[3];\n"
" sprintf(str, \"test\");\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds\n", errout.str());
check("void f()\n"
"{\n"
" char str[5];\n"
" sprintf(str, \"test%s\", \"\");\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void sprintf4()
{
// ticket #690
check("void f()\n"
"{\n"
" char a[3];\n"
" sprintf(a, \"%02ld\", 99);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void sprintf5()
{
// ticket #729
check("void f(int condition)\n"
"{\n"
" char buf[3];\n"
" sprintf(buf, \"%s\", condition ? \"11\" : \"22\");\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void sprintf6()
{
check("void f(int condition)\n"
"{\n"
" char buf[3];\n"
" sprintf(buf, \"%s\", condition ? \"11\" : \"222\");\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds\n", errout.str());
}
void snprintf1()
{
check("void f()\n"
"{\n"
" char str[5];\n"
" snprintf(str, 10, \"%s\", \"abc\");\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) snprintf size is out of bounds\n", errout.str());
}
void snprintf2()
{
check("void f()\n"
"{\n"
" char str[5];\n"
" snprintf(str, 5, \"%s\", \"abc\");\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void snprintf3()
{
check("void f()\n"
"{\n"
" char str[5];\n"
" snprintf(str, sizeof str, \"%s\", \"abc\");\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void snprintf4()
{
check("void f(int x)\n"
"{\n"
" char str[5];\n"
" snprintf(str, 8 - x, \"abcdefghijkl\");\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void strncat1()
{
check("void f(char *a, char *b)\n"
"{\n"
" char str[16];\n"
" strncpy(str, a, 10);\n"
" strncat(str, b, 10);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (possible error) Dangerous usage of strncat. Tip: the 3rd parameter means maximum number of characters to append\n", errout.str());
}
void strncat2()
{
check("void f(char *a)\n"
"{\n"
" char str[5];\n"
" strncat(str, a, 5);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (possible error) Dangerous usage of strncat. Tip: the 3rd parameter means maximum number of characters to append\n", errout.str());
}
void cin1()
{
check("#include <iostream>\n"
"using namespace std;\n"
"void f()\n"
"{\n"
" char str[10];\n"
" cin >> str;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (possible error) Dangerous usage of std::cin, possible buffer overrun\n", errout.str());
}
void varid1()
{
check("void foo()\n"
"{\n"
" char str[10];\n"
" if (str[0])\n"
" {\n"
" char str[50];\n"
" str[30] = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void varid2()
{
check("void foo()\n"
"{\n"
" char str[10];\n"
" if (str[0])\n"
" {\n"
" char str[50];\n"
" memset(str,0,50);\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void assign1()
{
check("char str[3] = {'a', 'b', 'c'};\n"
"\n"
"void foo()\n"
"{\n"
" str[3] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'str[3]' index 3 out of bounds\n", errout.str());
}
void alloc()
{
check("void foo()\n"
"{\n"
" char *s = new char[10];\n"
" s[10] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 's[10]' index 10 out of bounds\n", errout.str());
check("void foo()\n"
"{\n"
" char *s = (char *)malloc(10);\n"
" s[10] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 's[10]' index 10 out of bounds\n", errout.str());
check("void foo()\n"
"{\n"
"char * buf = new char[8];\n"
"buf[7] = 0;\n"
"delete [] buf;\n"
"buf = new char[9];\n"
"buf[8] = 0;\n"
"delete [] buf;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
"char * buf = new char[8];\n"
"buf[7] = 0;\n"
"delete [] buf;\n"
"buf = new char[9];\n"
"buf[9] = 0;\n"
"delete [] buf;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (error) Array 'buf[9]' index 9 out of bounds\n", errout.str());
// ticket #842
check("void f() {\n"
" int *tab4 = malloc(20 * sizeof(int));\n"
" tab4[20] = 0;\n"
" free(tab4);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Array 'tab4[20]' index 20 out of bounds\n", errout.str());
check("void f() {\n"
" int *tab4 = malloc(20 * sizeof(int));\n"
" tab4[19] = 0;\n"
" free(tab4);\n"
" tab4 = malloc(21 * sizeof(int));\n"
" tab4[20] = 0;\n"
" free(tab4);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int *tab4 = malloc(20 * sizeof(int));\n"
" tab4[19] = 0;\n"
" tab4 = realloc(tab4,21 * sizeof(int));\n"
" tab4[20] = 0;\n"
" free(tab4);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void memset1()
{
check("void foo()\n"
"{\n"
" char s[10];\n"
" memset(s, 5, '*');\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (possible error) The size argument is given as a char constant\n", errout.str());
check("void foo()\n"
"{\n"
" int* x[5];\n"
" memset(x, 0, sizeof(x));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void memset2()
{
check("class X {\n"
" char* array[2];\n"
" X();\n"
"};\n"
"X::X() {\n"
" memset(array, 0, sizeof(array));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void counter_test()
{
std::list<const Token*> unknownParameter;
unknownParameter.push_back(0);
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("Hello", unknownParameter));
ASSERT_EQUALS(2, CheckBufferOverrun::countSprintfLength("s", unknownParameter));
ASSERT_EQUALS(2, CheckBufferOverrun::countSprintfLength("i", unknownParameter));
ASSERT_EQUALS(2, CheckBufferOverrun::countSprintfLength("%d", unknownParameter));
ASSERT_EQUALS(2, CheckBufferOverrun::countSprintfLength("%1d", unknownParameter));
ASSERT_EQUALS(3, CheckBufferOverrun::countSprintfLength("%2.2d", unknownParameter));
ASSERT_EQUALS(1, CheckBufferOverrun::countSprintfLength("%s", unknownParameter));
ASSERT_EQUALS(2, CheckBufferOverrun::countSprintfLength("f%s", unknownParameter));
ASSERT_EQUALS(1, CheckBufferOverrun::countSprintfLength("%-s", unknownParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%-5s", unknownParameter));
ASSERT_EQUALS(2, CheckBufferOverrun::countSprintfLength("\\\"", unknownParameter));
ASSERT_EQUALS(7, CheckBufferOverrun::countSprintfLength("Hello \\0Text", unknownParameter));
ASSERT_EQUALS(1, CheckBufferOverrun::countSprintfLength("\\0", unknownParameter));
ASSERT_EQUALS(2, CheckBufferOverrun::countSprintfLength("%%", unknownParameter));
ASSERT_EQUALS(3, CheckBufferOverrun::countSprintfLength("%d%d", unknownParameter));
ASSERT_EQUALS(3, CheckBufferOverrun::countSprintfLength("\\\\a%s\\0a", unknownParameter));
ASSERT_EQUALS(10, CheckBufferOverrun::countSprintfLength("\\\\\\\\Hello%d \\0Text\\\\\\\\", unknownParameter));
ASSERT_EQUALS(4, CheckBufferOverrun::countSprintfLength("%%%%%d", unknownParameter));
Token strTok(0);
strTok.str("\"12345\"");
std::list<const Token*> stringAsParameter;
stringAsParameter.push_back(&strTok);
ASSERT_EQUALS(9, CheckBufferOverrun::countSprintfLength("str%s", stringAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%-4s", stringAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%-5s", stringAsParameter));
ASSERT_EQUALS(7, CheckBufferOverrun::countSprintfLength("%-6s", stringAsParameter));
ASSERT_EQUALS(5, CheckBufferOverrun::countSprintfLength("%.4s", stringAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%.5s", stringAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%.6s", stringAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%5.6s", stringAsParameter));
ASSERT_EQUALS(7, CheckBufferOverrun::countSprintfLength("%6.6s", stringAsParameter));
std::list<const Token*> intAsParameter;
Token numTok(0);
numTok.str("12345");
intAsParameter.push_back(&numTok);
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%02ld", intAsParameter));
ASSERT_EQUALS(9, CheckBufferOverrun::countSprintfLength("%08ld", intAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%.2d", intAsParameter));
ASSERT_EQUALS(9, CheckBufferOverrun::countSprintfLength("%08.2d", intAsParameter));
TODO_ASSERT_EQUALS(5, CheckBufferOverrun::countSprintfLength("%x", intAsParameter));
ASSERT_EQUALS(5, CheckBufferOverrun::countSprintfLength("%4x", intAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%5x", intAsParameter));
ASSERT_EQUALS(5, CheckBufferOverrun::countSprintfLength("%.4x", intAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%.5x", intAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%1.5x", intAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%5.1x", intAsParameter));
std::list<const Token*> floatAsParameter;
Token floatTok(0);
floatTok.str("1.12345f");
floatAsParameter.push_back(&floatTok);
TODO_ASSERT_EQUALS(5, CheckBufferOverrun::countSprintfLength("%.2f", floatAsParameter));
ASSERT_EQUALS(9, CheckBufferOverrun::countSprintfLength("%8.2f", floatAsParameter));
TODO_ASSERT_EQUALS(5, CheckBufferOverrun::countSprintfLength("%2.2f", floatAsParameter));
std::list<const Token*> floatAsParameter2;
Token floatTok2(0);
floatTok2.str("100.12345f");
floatAsParameter2.push_back(&floatTok2);
TODO_ASSERT_EQUALS(7, CheckBufferOverrun::countSprintfLength("%2.2f", floatAsParameter2));
TODO_ASSERT_EQUALS(7, CheckBufferOverrun::countSprintfLength("%.2f", floatAsParameter));
TODO_ASSERT_EQUALS(7, CheckBufferOverrun::countSprintfLength("%4.2f", floatAsParameter));
std::list<const Token*> multipleParams;
multipleParams.push_back(&strTok);
multipleParams.push_back(0);
multipleParams.push_back(&numTok);
ASSERT_EQUALS(15, CheckBufferOverrun::countSprintfLength("str%s%d%d", multipleParams));
ASSERT_EQUALS(26, CheckBufferOverrun::countSprintfLength("str%-6s%08ld%08ld", multipleParams));
}
void strncpy1()
{
check("void f()\n"
"{\n"
" char a[6];\n"
" char c[7];\n"
" strcpy(a,\"hello\");\n"
" strncpy(c,a,sizeof(c));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char a[6];\n"
" char c[6];\n"
" strcpy(a,\"hello\");\n"
" strncpy(c,a,sizeof(c));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char a[6];\n"
" char c[5];\n"
" strcpy(a,\"hello\");\n"
" strncpy(c,a,sizeof(c)+1);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Buffer access out-of-bounds\n", errout.str());
check("void f()\n"
"{\n"
" char c[6];\n"
" strncpy(c,\"hello!\",sizeof(c));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char c[6];\n"
" strncpy(c,\"hello!\",sizeof(c)+1);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds\n", errout.str());
}
void unknownType()
{
check("void f()\n"
"{\n"
" UnknownType *a = malloc(4);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void terminateStrncpy1()
{
check("void foo ( char *bar )\n"
"{\n"
" char baz[100];\n"
" strncpy(baz, bar, sizeof(baz));\n"
" strncpy(baz, bar, sizeof(baz));\n"
" baz[99] = 0;\n"
" strncpy(baz, bar, sizeof(baz));\n"
" baz[sizeof(baz)-1] = 0;\n"
" strncpy(baz, bar, sizeof(baz));\n"
" *(baz + 99) = 0;\n"
" strncpy(baz, bar, sizeof(baz));\n"
" bar[99] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) After a strncpy() the buffer should be zero-terminated\n", errout.str());
}
void terminateStrncpy2()
{
check("char *foo ( char *bar )\n"
"{\n"
" char baz[100];\n"
" strncpy(baz, bar, sizeof(baz));\n"
" bar[99] = 0;\n"
" return baz;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) After a strncpy() the buffer should be zero-terminated\n", errout.str());
}
};
REGISTER_TEST(TestBufferOverrun)