CODEWITHSUNDEEP
assemblygdb
Mike Flynn
Mike Flynn

Reputation: 1027

Beginning to look at lower level stuff, possibly simply error I don't understand. Buffer Overflow tutorial: Invalid registry 'esp'?

I stumbled across a simple buffer overflow (hey what do you know?) tutorial and thought that I might try it out. The video is about 20 minutes long but it's really interesting, I would recommend watching it if you are not familiar with the stuff. Here's the URL:

http://www.securitytube.net/video/1752

My problem comes in at around 14:17, at that point he inputs a command to look up the stack pointer, but I input the same command, with almost the same code (different memory locations) and get this:

(gdb) i r esp
 Invalid register `esp'

I don't really know why this is happening, I don't know how it works yet. Did I overwrite the stack pointer or something? I'm running the linux actually through Virtual Box on Windows 7, with the most recent release of Backtrack linux.

Upvotes: 2

Views: 104

Answers (1)

Gunther Piez
Gunther Piez

Reputation: 30449

You need to prefix registers with "$", i. e.

i r $esp

As you are using a 64 bit gdb, the register name is $rsp.

Upvotes: 1

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