Analysing a simple "Hello World" Program

[Delshire]

Hey nulled! Today we will be writing a simple hello world program in C, compiling it, then analyzing the disassembled binary.

 

 

The code will be compiled with gcc and disassembled using gdb; if you are using Windows, you can get Dev-C++ that comes with all the gcc utilities, including gdb.

 

Bear in mind that if you compile the source code yourself, your assembly code may be slightly different from mine due to variations in the different versions of gcc (I am using gcc v3.3.5 on Linux and v3.4.2 on Windows).

 

Also, your memory addresses probably won’t match mine, but this is normal as they will  be different when compiled on different systems. 

 

GDB Basics

GDB is both a debugger and a disassembler. In this example, we will be using gdb as a disassembler to perform a static analysis of our code. Gdb has many commands, but for our purposes there are just a few we will be using:

 

Hello World!

Hidden Content
You'll be able to see the hidden content once you reply to this topic or upgrade your account.

Good luck.

[Awii]

Hmm, let's see.

 

Edit: didn't understand anything but looks nice!

Edited by Awii, 25 October 2015 - 06:43 PM.

[Delshire]

Hmm, let's see.

 

Edit: didn't understand anything but looks nice!

 

lol, well tell me what you did not understand so i can help you.

[xramtun203]

lol i dont have your help but your intelli is so good 

[Oxide]

Please fix the color of your topic

[Delshire]

Please fix the color of your topic

 

I make all my threads in that colour, don't you like it pepo ? 

 

Edit: Either way, I'm closing this topic, going to make another more in depth, more pictures and noob-friendly. I recognise it's hard to read.

Edited by Delshire, 29 October 2015 - 03:12 AM.

[pruned_47976132]

well...

[cyongaming]

thanks dude

[sinky]

ty

[pruned_86555174]

thank! no i dont!