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7COM1028 Secure Systems Programming

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Question 1: The following program reads two strings in1 and in2 and concatenates them to producethe string out.1. int main( void ) {2. char[YourNumber] in = gets();3. char[YourNumber] in2 = gets();4. char[2*YourNumber-1] out;5. strcpy(out,in);6. int index = strlen(in);7. while(index < 2*YourNumber-1) {8. out[index] = in2[index-strlen(in)];9. index = index + 1;10. }11. return 0;12. } Which lines have buffer length checking errors? Fix each line....

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Question Preview:

Question 1: The following program reads two strings in1 and in2 and concatenates them to producethe string out.1. int main( void ) {2. char[YourNumber] in = gets();3. char[YourNumber] in2 = gets();4. char[2*YourNumber-1] out;5. strcpy(out,in);6. int index = strlen(in);7. while(index < 2*YourNumber-1) {8. out[index] = in2[index-strlen(in)];9. index = index + 1;10. }11. return 0;12. } Which lines have buffer length checking errors? Fix each line.

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Solution 1

Buffer length checking issue is in Line2, Line3;2. char[YourNumber] in = gets();3. char[YourNumber] in2 = gets();In the given example, gets() function , it reads input string from STDIN (standard input). Ad prints the input string of the screen. But the major issue with the gets() function is that it doesn’t do the boundary checking and due to this gets() function throws Buffer overflow error when the size of input string goes beyond the size of the input buffer. Gets() function read the input from STDIN till it gets the new line character.So in order to avoid this buffer overflow error with this gets function, we can use the fgets()function. In the fgets() function we pass 3 params ( input buffer, size of input buffer and source ofinput stream). So here fgets() function does the boundary check with corresponding input bufferlength.

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