cwetest/CWE122_Heap_Based_Buffer_Overflow__CWE131_loop_03.c

/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE122_Heap_Based_Buffer_Overflow__CWE131_loop_03.c
Label Definition File: CWE122_Heap_Based_Buffer_Overflow__CWE131.label.xml
Template File: sources-sink-03.tmpl.c
*/
/*
 * @description
 * CWE: 122 Heap Based Buffer Overflow
 * BadSource:  Allocate memory without using sizeof(int)
 * GoodSource: Allocate memory using sizeof(int)
 * Sink: loop
 *    BadSink : Copy array to data using a loop
 * Flow Variant: 03 Control flow: if(5==5) and if(5!=5)
 *
 * */

#include "std_testcase.h"

#ifndef OMITBAD

void CWE122_Heap_Based_Buffer_Overflow__CWE131_loop_03_bad()
{
    int * data;
    data = NULL;
    if(5==5)
    {
        /* FLAW: Allocate memory without using sizeof(int) */
        data = (int *)malloc(10);
        if (data == NULL) {exit(-1);}
    }
    {
        int source[10] = {0};
        size_t i;
        /* POTENTIAL FLAW: Possible buffer overflow if data was not allocated correctly in the source */
        for (i = 0; i < 10; i++)
        {
            data[i] = source[i];
        }
        printIntLine(data[0]);
        free(data);
    }
}

#endif /* OMITBAD */

#ifndef OMITGOOD

/* goodG2B1() - use goodsource and badsink by changing the 5==5 to 5!=5 */
static void goodG2B1()
{
    int * data;
    data = NULL;
    if(5!=5)
    {
        /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
        printLine("Benign, fixed string");
    }
    else
    {
        /* FIX: Allocate memory using sizeof(int) */
        data = (int *)malloc(10*sizeof(int));
        if (data == NULL) {exit(-1);}
    }
    {
        int source[10] = {0};
        size_t i;
        /* POTENTIAL FLAW: Possible buffer overflow if data was not allocated correctly in the source */
        for (i = 0; i < 10; i++)
        {
            data[i] = source[i];
        }
        printIntLine(data[0]);
        free(data);
    }
}

/* goodG2B2() - use goodsource and badsink by reversing the blocks in the if statement */
static void goodG2B2()
{
    int * data;
    data = NULL;
    if(5==5)
    {
        /* FIX: Allocate memory using sizeof(int) */
        data = (int *)malloc(10*sizeof(int));
        if (data == NULL) {exit(-1);}
    }
    {
        int source[10] = {0};
        size_t i;
        /* POTENTIAL FLAW: Possible buffer overflow if data was not allocated correctly in the source */
        for (i = 0; i < 10; i++)
        {
            data[i] = source[i];
        }
        printIntLine(data[0]);
        free(data);
    }
}

void CWE122_Heap_Based_Buffer_Overflow__CWE131_loop_03_good()
{
    goodG2B1();
    goodG2B2();
}

#endif /* OMITGOOD */

/* Below is the main(). It is only used when building this testcase on
 * its own for testing or for building a binary to use in testing binary
 * analysis tools. It is not used when compiling all the testcases as one
 * application, which is how source code analysis tools are tested.
 */

#ifdef INCLUDEMAIN

int main(int argc, char * argv[])
{
    /* seed randomness */
    srand( (unsigned)time(NULL) );
#ifndef OMITGOOD
    printLine("Calling good()...");
    CWE122_Heap_Based_Buffer_Overflow__CWE131_loop_03_good();
    printLine("Finished good()");
#endif /* OMITGOOD */
#ifndef OMITBAD
    printLine("Calling bad()...");
    CWE122_Heap_Based_Buffer_Overflow__CWE131_loop_03_bad();
    printLine("Finished bad()");
#endif /* OMITBAD */
    return 0;
}

#endif