giveio.c File Reference

#include <ntddk.h>

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Macros
#define	DEVICE_NAME_STRING   L"giveio"
#define	IOPM_SIZE   0x2000

Typedefs
typedef UCHAR	IOPM[IOPM_SIZE]

Functions
void	Ke386SetIoAccessMap (int, IOPM *)
void	Ke386QueryIoAccessMap (int, IOPM *)
void	Ke386IoSetAccessProcess (PEPROCESS, int)
VOID	GiveioUnload (IN PDRIVER_OBJECT DriverObject)
VOID	SetIOPermissionMap (int OnFlag)
void	GiveIO (void)
NTSTATUS	GiveioCreateDispatch (IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
NTSTATUS	DriverEntry (IN PDRIVER_OBJECT DriverObject, IN PUNICODE_STRING RegistryPath)

Variables
IOPM *	IOPM_local = 0

Macro Definition Documentation

DEVICE_NAME_STRING

#define DEVICE_NAME_STRING   L"giveio"

IOPM_SIZE

#define IOPM_SIZE   0x2000

Typedef Documentation

IOPM

typedef UCHAR IOPM[IOPM_SIZE]

Function Documentation

DriverEntry()

NTSTATUS DriverEntry	(	IN PDRIVER_OBJECT	DriverObject,
		IN PUNICODE_STRING	RegistryPath
	)

{
  PDEVICE_OBJECT deviceObject;
  NTSTATUS status;
  WCHAR NameBuffer[] = L"\\Device\\" DEVICE_NAME_STRING;
  WCHAR DOSNameBuffer[] = L"\\DosDevices\\" DEVICE_NAME_STRING;
  UNICODE_STRING uniNameString, uniDOSString;
 
  //
  //  Allocate a buffer for the local IOPM and zero it.
  //
  IOPM_local = MmAllocateNonCachedMemory(sizeof(IOPM));
  if(IOPM_local == 0)
    return STATUS_INSUFFICIENT_RESOURCES;
  RtlZeroMemory(IOPM_local, sizeof(IOPM));
 
  //
  //  Set up device driver name and device object.
  //
  RtlInitUnicodeString(&uniNameString, NameBuffer);
  RtlInitUnicodeString(&uniDOSString, DOSNameBuffer);
 
  status = IoCreateDevice(DriverObject, 0,
          &uniNameString,
          FILE_DEVICE_UNKNOWN,
          0, FALSE, &deviceObject);
 
  if(!NT_SUCCESS(status))
    return status;
 
  status = IoCreateSymbolicLink (&uniDOSString, &uniNameString);
 
  if (!NT_SUCCESS(status))
    return status;
 
    //
    //  Initialize the Driver Object with driver's entry points.
  // All we require are the Create and Unload operations.
    //
    DriverObject->MajorFunction[IRP_MJ_CREATE] = GiveioCreateDispatch;
  DriverObject->DriverUnload = GiveioUnload;
    return STATUS_SUCCESS;
}

References DEVICE_NAME_STRING, FALSE, GiveioCreateDispatch(), GiveioUnload(), IOPM_local, and L.

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GiveIO()

void GiveIO

(

void

)

{
  SetIOPermissionMap(1);
}

References SetIOPermissionMap().

Referenced by GiveioCreateDispatch().

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GiveioCreateDispatch()

NTSTATUS GiveioCreateDispatch	(	IN PDEVICE_OBJECT	DeviceObject,
		IN PIRP	Irp
	)

{
  GiveIO();     // give the calling process I/O access
 
    Irp->IoStatus.Information = 0;
    Irp->IoStatus.Status = STATUS_SUCCESS;
    IoCompleteRequest(Irp, IO_NO_INCREMENT);
    return STATUS_SUCCESS;
}

References GiveIO().

Referenced by DriverEntry().

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GiveioUnload()

VOID GiveioUnload

(

IN PDRIVER_OBJECT

DriverObject

)

{
  WCHAR DOSNameBuffer[] = L"\\DosDevices\\" DEVICE_NAME_STRING;
  UNICODE_STRING uniDOSString;
 
  if(IOPM_local)
    MmFreeNonCachedMemory(IOPM_local, sizeof(IOPM));
 
  RtlInitUnicodeString(&uniDOSString, DOSNameBuffer);
  IoDeleteSymbolicLink (&uniDOSString);
  IoDeleteDevice(DriverObject->DeviceObject);
}

References DEVICE_NAME_STRING, IOPM_local, and L.

Referenced by DriverEntry().

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Ke386IoSetAccessProcess()

void Ke386IoSetAccessProcess	(	PEPROCESS	,
		int
	)

Referenced by SetIOPermissionMap().

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Ke386QueryIoAccessMap()

void Ke386QueryIoAccessMap	(	int	,
		IOPM *
	)

Ke386SetIoAccessMap()

void Ke386SetIoAccessMap	(	int	,
		IOPM *
	)

Referenced by SetIOPermissionMap().

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SetIOPermissionMap()

VOID SetIOPermissionMap

(

int

OnFlag

)

{
  Ke386IoSetAccessProcess(PsGetCurrentProcess(), OnFlag);
  Ke386SetIoAccessMap(1, IOPM_local);
}

References IOPM_local, Ke386IoSetAccessProcess(), and Ke386SetIoAccessMap().

Referenced by GiveIO().

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Variable Documentation

IOPM_local

IOPM* IOPM_local = 0

Referenced by DriverEntry(), GiveioUnload(), and SetIOPermissionMap().