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Index > OS Construction > Control stack error

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Fulgurance



Joined: 27 Nov 2017
Posts: 108
Fulgurance
Hello, today, i ask me question. I would like to implement program to control the use of the stack when some program use it.

I have tested bad fasm program he pop infinitely the stack. But when i launch it into virtual machine, virtual machine don't crash. What is the way to control stack error ?
Post 25 Mar 2020, 14:11
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17063
Location: In your JS exploiting you and your system
revolution
If your OS is using paging then you can use guard pages and reserved pages to monitor the stack growth.
Post 25 Mar 2020, 14:41
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Fulgurance



Joined: 27 Nov 2017
Posts: 108
Fulgurance
It's not my question. I would like to know if processor give flag control when stack encounter an error
Post 25 Mar 2020, 15:21
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17063
Location: In your JS exploiting you and your system
revolution
I'm not sure what you are asking. There aren't any flags that are related to the stack.

The only method I am aware of is to set up paging and place guard/reserved pages around the stack memory. Then trap the protection faults to see when the app accesses outside with the stack.
Post 25 Mar 2020, 15:32
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Fulgurance



Joined: 27 Nov 2017
Posts: 108
Fulgurance
Yes, you have understand good Smile

Thanks you for your suggestion, thanks you very much !
Post 25 Mar 2020, 15:43
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Fulgurance



Joined: 27 Nov 2017
Posts: 108
Fulgurance
Just another question, what is the max possible size of stack ? 4 bytes ?
Post 25 Mar 2020, 16:49
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17063
Location: In your JS exploiting you and your system
revolution
That stack has no specific maximum or minimum. It can be zero bytes up to the entire address space.
Post 25 Mar 2020, 17:32
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