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Buffer-overflow

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Buffer-overflow is a common computer security concern. Write a simple program, in C, C++, and Java, to declare a simple one dimensional array and then attempt to access an array element that is not within its bounds. For example, what happens if I declare an array to be in studentNums[10] and then attempt to access studentNums[11], studentNums[12], or ..., studentNums[100] ?

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Solution Summary

To explain buffer-overflow computer security concern, a simple program is written, in C, C++, and Java, to declare a simple one dimensional array and then attempt to access an array element that is not within its bounds.

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In C/C++ the system does allow accessing an array element that is not within its bounds.

For instance this C/C++ code:

#include
#include
int main()
{
int studentNums[10] ;

memset ((void *)studentNums, 0x00, sizeof (studentNums)) ;

printf ("studentNums[9] = %dn", studentNums[9] ) ;

printf ("studentNums[10] = %dn", studentNums[10] ) ;

printf ("studentNums[11] = %dn", studentNums[11] ) ;

studentNums[11] = 11 ;

printf ("studentNums[11] = %dn", studentNums[11] ) ;

return 0;
}

outputs:

studentNums[9] = 0
studentNums[10] = ...

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