Computing 101


pwn.college Archives.

Archived Computing 101 challenges.


Okay, let's stretch that to one more depth! We've added an additional level of indirection in this challenge, so now you'll need three dereferences to find the secret value. Something like this:

        Address │ Contents
      +────────────────────+
┌────▸│ 133700  │ 123400   │───┐
│     +────────────────────+   │
│ ┌──▸│ 123400  │ 100000   │─┐ │
│ │   +────────────────────+ │ │
│ │ ┌▸│ 100000  │ 42       │ │ │
│ │ │ +────────────────────+ │ │
│ │ └────────────────────────┘ │
│ └────────────────────────────┘
└──────────────────────────────┐
                               │
       Register │ Contents     │
      +────────────────────+   │
      │ rdi     │ 133700   │───┘
      +────────────────────+

As you can see, we'll place the first address that you must dereference into rdi. Go get the value!


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