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Book/movie review
22/08/2022
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
.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
The writer is very fast, professional and responded to the review request fast also. Thank you.
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