February 2012
Intermediate to advanced
800 pages
23h 55m
English
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Identifying Execution Location
Shellcode needs to dereference a base pointer when accessing data in a position-independent manner. Adding or subtracting values to this base value will allow it to safely access data that is included with the shellcode. Because the x86 instruction set does not provide EIP-relative data access, as it does for control-flow instructions, a general-purpose register must first be loaded with the current instruction pointer, to be used as the base pointer.
Obtaining the current instruction pointer may not be immediately obvious, because the
instruction pointer on x86 systems cannot be directly accessed by software. In fact, there is no way
to assemble the instruction mov eax, eip to directly load a general-purpose register ...
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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.
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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.