February 2012
Intermediate to advanced
800 pages
23h 55m
English
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APC Injection
Earlier in this chapter, you saw that by creating a thread using CreateRemoteThread, you can invoke functionality in a remote process. However, thread
creation requires overhead, so it would be more efficient to invoke a function on an existing thread. This capability exists in Windows as the asynchronous
procedure call (APC).
APCs can direct a thread to execute some other code prior to executing its regular execution
path. Every thread has a queue of APCs attached to it, and these are processed when the thread is in
an alertable state, such as when they call functions like WaitForSingleObjectEx, WaitForMultipleObjectsEx, and
SleepEx. These functions essentially give the thread a chance to
process the waiting APCs.
If an application ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.