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, youll notice there is a print_a function that is not reachable through the execution path of the code as its 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 .data str: .asciiz “You’ve earned an A+!” buffer: .space 28 .text li $v0,8 la $a0, buffer li $a1, 28 move $t0,$a0 syscall move $a0, $t0 jal print li $v0, 10 syscall print: addi $sp, $sp, -20 sw $ra, 16($sp) sw $a0, 12($sp) addi $t4, $sp, 0 la $t1, ($a0) load_str: lbu $t2, ($t1) slti $t3, $t2, 1 beq $t2, 48, null resume: sb $t2, 0($t4) addi $t4, $t4, 1 addi $t1, $t1, 1 bne $t3, 1, load_str li $v0, 4 syscall lw $ra 16($sp) lw $a0 12($sp) jr $ra null: addi $t2, $t2, -48 j resume print_a: li $v0, 4 la $a0, str syscall Link to the code as well: https://github.com/jkovba/jhu_sp20_comporg/blob/master/overflow.s
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