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Mastering Assembly Programming
book

Mastering Assembly Programming

by Alexey Lyashko
September 2017
Beginner to intermediate
290 pages
6h 58m
English
Packt Publishing
Content preview from Mastering Assembly Programming

Patching Legacy Code

A few years ago, I had an opportunity to work on an interesting project--I was contacted by a business owner who was left with an unusable executable, locked by a disgraceful developer who took the money and disappeared. Having no source code, the only option was to patch the executable in order to change the execution flow and bypass the lock.

Unfortunately, this is not an isolated case. It happens quite often that an old tool, which has been around for years (if not decades), needs to be slightly changed and then... well, then there are at least two options:

  • The source code has been lost and there is no way to rebuild the executable after applying changes.
  • The source code is there, but it appears to be so old that ...
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Publisher Resources

ISBN: 9781787287488