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Re: Windows does overcommit stacks !

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Here's another proof that Windows does overcommit stacks:

#include <Windows.h>
#include <iostream>
#include <sstream>

#pragma warning(disable: 6387) // parameter ... could ne null

using namespace std;

int main( int argc, char **argv )
{
	auto stackThread = []( LPVOID lpvThreadParam ) -> DWORD
	{
		char const *stackTop, *stackBottom;
		GetCurrentThreadStackLimits( &(ULONG_PTR &)stackBottom, &(ULONG_PTR 
&)stackTop );
		SYSTEM_INFO si;
		GetSystemInfo( &si );
		MEMORY_BASIC_INFORMATION mbi;
		auto query = [&]( char const *p ) -> char const *
		{
			if( VirtualQuery( p, &mbi, sizeof mbi ) != sizeof mbi )
				ExitProcess( EXIT_FAILURE );
			return (char *)mbi.AllocationBase;
		};
		char const *base = query( stackBottom ), *p;
		do
		{
			cout << mbi.RegionSize / si.dwPageSize << ": ";
			unsigned n = 0;
			auto append = [&]<typename ... T>( T &&... values )	{ if( n++ ) cout 
<< ", "; ((cout << values), ...); };
			if( mbi.State != MEM_FREE )
				if( mbi.State == MEM_COMMIT )
					append( "comitted" );
				else if( mbi.State == MEM_RESERVE )
					append( "reserved" );
				else
					append( "S: 0x", hex, mbi.State );
			if( !mbi.Protect )
				append( "unacessible" );
			else if( mbi.Protect & PAGE_GUARD )
				append( "guard page" );
			else if( mbi.Protect == PAGE_READWRITE )
				append( "read-write" );
			else
				append( "P: 0x", hex, mbi.Protect );
			cout << endl;
			p = (char *)mbi.BaseAddress + mbi.RegionSize;
		} while( query( p ) == base );
		return 123;
	};
	HANDLE hThread = CreateThread( nullptr, 0x100000, stackThread, (void 
*)(ptrdiff_t)(argc >= 2), STACK_SIZE_PARAM_IS_A_RESERVATION, nullptr);
	WaitForSingleObject( hThread, INFINITE );
	CloseHandle( hThread );
	return 0;
}

This prints the attributes of the pages in the range of the stack.

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Thread

Windows does overcommit stacks ! Bonita Montero <Bonita.Montero@gmail.com> - 2022-11-10 04:16 +0100
  Re: Windows does overcommit stacks ! yx ma <myxfxtstart@gmail.com> - 2022-11-09 23:32 -0800
  Re: Windows does overcommit stacks ! Michael S <already5chosen@yahoo.com> - 2022-11-10 02:59 -0800
    Re: Windows does overcommit stacks ! Bonita Montero <Bonita.Montero@gmail.com> - 2022-11-10 12:42 +0100
      Re: Windows does overcommit stacks ! Michael S <already5chosen@yahoo.com> - 2022-11-10 04:34 -0800
        Re: Windows does overcommit stacks ! Bonita Montero <Bonita.Montero@gmail.com> - 2022-11-10 14:08 +0100
          Re: Windows does overcommit stacks ! Öö Tiib <ootiib@hot.ee> - 2022-11-10 05:18 -0800
            Re: Windows does overcommit stacks ! Bonita Montero <Bonita.Montero@gmail.com> - 2022-11-10 14:36 +0100
  Re: Windows does overcommit stacks ! Bonita Montero <Bonita.Montero@gmail.com> - 2022-11-14 22:03 +0100
    Re: Windows does overcommit stacks ! Öö Tiib <ootiib@hot.ee> - 2022-11-15 04:09 -0800
      Re: Windows does overcommit stacks ! Bonita Montero <Bonita.Montero@gmail.com> - 2022-11-15 14:23 +0100
        Re: Windows does overcommit stacks ! Michael S <already5chosen@yahoo.com> - 2022-11-15 06:23 -0800
          Re: Windows does overcommit stacks ! Bonita Montero <Bonita.Montero@gmail.com> - 2022-11-15 16:39 +0100
  Re: Windows does overcommit stacks ! Bonita Montero <Bonita.Montero@gmail.com> - 2023-03-20 18:45 +0100

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