GlobalVariableManagement.c File Reference

Management of global variables. More...

#include "pch.h"

Functions
BOOLEAN	GlobalGuestStateAllocateZeroedMemory (VOID)
	Allocate guest state memory.
VOID	GlobalGuestStateFreeMemory (VOID)
	Free guest state memory.

Detailed Description

Management of global variables.

Author

Behrooz Abbassi (Behro.nosp@m.ozAb.nosp@m.bassi.nosp@m.@hyp.nosp@m.erdbg.nosp@m..org)

Version

0.1

Date

2022-03-29

Copyright

This project is released under the GNU Public License v3.

Function Documentation

GlobalGuestStateAllocateZeroedMemory()

BOOLEAN GlobalGuestStateAllocateZeroedMemory

(

VOID

)

Allocate guest state memory.

Returns

BOOLEAN

{
    SSIZE_T BufferSizeInByte = sizeof(VIRTUAL_MACHINE_STATE) * KeQueryActiveProcessorCount(0);
 
    //
    // Allocate global variable to hold Guest(s) state
    //
    if (!g_GuestState)
    {
        g_GuestState = PlatformMemAllocateNonPagedPool(BufferSizeInByte);
 
        if (!g_GuestState)
        {
            LogError("Err, insufficient memory\n");
            return FALSE;
        }
    }
 
    //
    // Zero the memory
    //
    RtlZeroMemory(g_GuestState, BufferSizeInByte);
 
    return TRUE;
}

GlobalGuestStateFreeMemory()

VOID GlobalGuestStateFreeMemory

(

VOID

)

Free guest state memory.

Returns

VOID

{
    PlatformMemFreePool(g_GuestState);
    g_GuestState = NULL;
}