February 2012
Intermediate to advanced
800 pages
23h 55m
English
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Manual Symbol Resolution
Shellcode exists as a binary blob that gains execution. It must do something useful once it gains execution, which usually means interacting with the system through APIs.
Remember that shellcode cannot use the Windows loader to ensure that all required libraries
are loaded and available, and to make sure that all external symbols are resolved. Instead, it must
find the symbols itself. The shellcode in the previous examples used hard-coded addresses to find
the symbols, but this very fragile method will work only on a specific version of an OS and service
pack. Shellcode must dynamically locate the functions in order to work reliably in different
environments, and for that task, it typically uses LoadLibraryA
and GetProcAddress ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.