Stack overflow | Computer Science homework help


Paste the code into MIPS 

Next, please comment each line of code in the .text section. Please do this FIRST! It will make tracing through the code much easier. 

Once you understand what the code is doing, you’ll notice there is a ‘print_a’ function that is not reachable through the execution path of the code as it’s written. Your job is to devise an input that overflows the call stack and overwrites the $ra register causing the program to execute the ‘print_a’ function. Please provide the successful input that triggers the overflow, a screenshot of the successful execution of your attack that prints the A+ message, and a detailed description of how you figured out how to exploit the buffer overflow and how you devised the proper input. 

Code used for the assignment above


    str: .asciiz “You’ve earned an A+!”

    buffer: .space 28



    li $v0,8

    la $a0, buffer

    li $a1, 28

   move $t0,$a0



    move $a0, $t0

    jal print


   li $v0, 10




     addi $sp, $sp, -20

     sw $ra, 16($sp)

     sw $a0, 12($sp)


     addi $t4, $sp, 0

     la $t1, ($a0)



   lbu $t2, ($t1)

   slti $t3, $t2, 1

   beq $t2, 48, null




         sb $t2, 0($t4)

         addi $t4, $t4, 1

         addi $t1, $t1, 1

         bne $t3, 1, load_str


        li $v0, 4



        lw $ra 16($sp)

        lw $a0 12($sp)

        jr $ra



     addi $t2, $t2, -48

     j resume


    li $v0, 4

    la $a0, str


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