New Orleans

We can set a breakpoint at main using the break main command.

We can see that the breakpoint has been set.

If we continue through the program using the continue or c command, the program has stopped execution at the breakpoint.

The program calls the following functions:

• create_password: Creates and sets a password for the lock.
• get_password: Takes user input.
• check_password: Checks if user input is correct. The create_password function seems interesting. Let's set a breakpoint there using break 447e and continue execution flow using c.

We can see that we are now inside the create_password function. Note that we could have directly jumped into this program using let pc = 447e command.

So this function sets the value of r15 to be equal to the address 0x2400 in memory.And then it moves some characters which seem to be our password into that memory address.

Let's set a breakpoint at 44ac and continue the execution.

Once we hit the breakpoint we can check the memory location using the R 2400 command

> R 2400
2400 5f6a 6b70 214d 7200 0000 0000 0000 0000  _jkp!Mr.........
2410 0000 0000 0000 0000 0000 0000 0000 0000  ................

Or we can just look in the Live Memory Dump section.

So the string that was read into memory was _jkp!Mr.

Let's continue to where we are prompted for the passsword.

If we send this password to the lock, we get the following message:

We have successfully unlocked the door and can get the Cy Yombinator bearer bonds or whatever they are called.

Let's go to the check_password function to see how it works.