Why is codesection such big?

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Cooglefish

Joined: 19 Feb 2008
Posts: 1

Cooglefish 19 Feb 2008, 12:53

Hello!

If I use just MessageBoxA in my code the codesection is very large, because many "DB 00" are added. Why? Is this because the sectionalignment? Is it possible to shrink?

Code:

00402000 PUSH 0                                   
00402002 PUSH 00401000
00402007 PUSH 0040100B 
0040200C PUSH 0 
0040200E  CALL DWORD PTR DS:[<&USER32.MessageBoxA>> 
00402014  RETN 
00402015  DB 00 
00402016  DB 00 
00402017  DB 00 
00402018  DB 00 
00402019  DB 00 
... 
... 
... 
00402FFC  DB 00 
00402FFD  DB 00 
00402FFE  DB 00 
00402FFF  DB 00

(Disassembled with Ollydbg)

Thanks,
Cooglefish

19 Feb 2008, 12:53

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20422
Location: In your JS exploiting you and your system

revolution 19 Feb 2008, 13:07

The OS allocates pages at a granularity of n*4k. It's a hardware design limitation.

19 Feb 2008, 13:07

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