Function SearchServiceFromKdbExt

kmclass.cpp:509–592

NTSTATUS SearchServiceFromKdbExt(PDRIVER_OBJECT KbdDriverObject, PDEVICE_OBJECT pPortDev)
{
    PDEVICE_OBJECT pTargetDeviceObject = NULL;
    UCHAR* DeviceExt;
    int i = 0;
    NTSTATUS status;
    PVOID KbdDriverStart;
    ULONG KbdDriverSize = 0;
    PDEVICE_OBJECT  pTmpDev;
    UNICODE_STRING  kbdDriName;

    KbdDriverStart = KbdDriverObject->DriverStart;
    KbdDriverSize = KbdDriverObject->DriverSize;

    status = STATUS_UNSUCCESSFUL;

    RtlInitUnicodeString(&kbdDriName, L"\\Driver\\kbdclass");
    pTmpDev = pPortDev;
    while (pTmpDev->AttachedDevice != NULL)
    {
        KdPrint(("Att:  0x%x", pTmpDev->AttachedDevice));
        KdPrint(("Dri Name : %wZ", &pTmpDev->AttachedDevice->DriverObject->DriverName));
        if (RtlCompareUnicodeString(&pTmpDev->AttachedDevice->DriverObject->DriverName,
            &kbdDriName, TRUE) == 0)
        {
            break;
        }
        pTmpDev = pTmpDev->AttachedDevice;
    }
    if (pTmpDev->AttachedDevice == NULL)
    {
        return status;
    }

    pTargetDeviceObject = KbdDriverObject->DeviceObject;
    while (pTargetDeviceObject)
    {
        if (pTmpDev->AttachedDevice != pTargetDeviceObject)
        {
            pTargetDeviceObject = pTargetDeviceObject->NextDevice;
            continue;
        }
        DeviceExt = (UCHAR*)pTmpDev->DeviceExtension;
        g_KoMCallBack.KdbDeviceObject = NULL;
        //�����������ҵ��Ķ˿��������豸��չ��ÿһ��ָ��  
        for (i = 0; i < 4096; i++, DeviceExt++)
        {
            PVOID tmp;
            if (!MmIsAddressValid(DeviceExt))
            {
                break;
            }
            //�ҵ������д�����ȫ�ֱ����У��������Ƿ��Ѿ������  
            //����Ѿ�����˾Ͳ��ü������ˣ�����ֱ���˳�  
            if (g_KoMCallBack.KdbDeviceObject && g_KoMCallBack.KeyboardClassServiceCallback)
            {
                status = STATUS_SUCCESS;
                break;