lib/ntdll/csr/probe.c

   1 /* $Id$
   2  *
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PROJECT:         ReactOS kernel
   5  * FILE:            lib/ntdll/csr/probe.c
   6  * PURPOSE:         CSRSS address range access probing API
   7  * AUTHOR:          Eric Kohl
   8  * DATE:            2001-06-17
   9  */
  10 #define NTOS_MODE_USER
  11 #include <ntos.h>
  12
  13 #define NDEBUG
  14 #include <ntdll/rtl.h>
  15
  16 VOID STDCALL
  17 CsrProbeForRead(IN CONST PVOID Address,
  18                 IN ULONG Length,
  19                 IN ULONG Alignment)
  20 {
  21    PUCHAR Pointer;
  22    UCHAR Data;
  23
  24    if (Length == 0)
  25      return;
  26
  27    if ((ULONG)Address & (Alignment - 1))
  28      RtlRaiseStatus(STATUS_DATATYPE_MISALIGNMENT);
  29
  30    Pointer = (PUCHAR)Address;
  31    Data = *Pointer;
  32    Pointer = (PUCHAR)((ULONG)Address + Length -1);
  33    Data = *Pointer;
  34 }
  35
  36 VOID STDCALL
  37 CsrProbeForWrite(IN CONST PVOID Address,
  38                  IN ULONG Length,
  39                  IN ULONG Alignment)
  40 {
  41    PUCHAR Pointer;
  42    UCHAR Data;
  43
  44    if (Length == 0)
  45      return;
  46
  47    if ((ULONG)Address & (Alignment - 1))
  48      RtlRaiseStatus(STATUS_DATATYPE_MISALIGNMENT);
  49
  50 //   if (Address >= MmUserProbeAddress)
  51 //     RtlRaiseStatus(STATUS_ACCESS_VIOLATION);
  52
  53    Pointer = (PUCHAR)Address;
  54    Data = *Pointer;
  55    *Pointer = Data;
  56    Pointer = (PUCHAR)((ULONG)Address + Length -1);
  57    Data = *Pointer;
  58    *Pointer = Data;
  59 }
  60
  61 /* EOF */