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Index > Windows > Size of the local buffer

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mikado3333



Joined: 31 Oct 2015
Posts: 6
Location: Russian Federation
mikado3333
Hello, People tell me what is the maximum size of the local buffer?

Code:

locals
bufCeh      rb 16384   
C23          dd 0
endl
 
push  ebx edi esi

    


error 0x 0000005

Directive stack does not help
Code:
format  PE GUI 4.0
stack   1048576 
entry   start
    
Post 28 Sep 2016, 11:52
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17472
Location: In your JS exploiting you and your system
revolution
There is no maximum local stack size except until you run out of memory, or you exceed the stack limit.

But be aware of the guard page that Windows uses to monitor stack growth and allocate new pages. You need to either statically allocate the stack by using the "stack maximum,allocated" directive or touch the stack from the top down one page at a time before trying to use it. Otherwise your program will crash with an invalid memory access.

So for your case you can use "stack 1048576,1048576" to avoid the access error.
Post 28 Sep 2016, 13:35
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Tomasz Grysztar



Joined: 16 Jun 2003
Posts: 7752
Location: Kraków, Poland
Tomasz Grysztar
In documentation there is an example of stack-probing macro, "sp_prologue", that you can use to automatically create a code that touches the stack in order to grow it when entering procedure.
Post 28 Sep 2016, 13:49
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mikado3333



Joined: 31 Oct 2015
Posts: 6
Location: Russian Federation
mikado3333
Understood, thanks
Post 28 Sep 2016, 18:12
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