ntoskrnl/ex/harderr.c

   1 /*
   2  * PROJECT:         ReactOS Kernel
   3  * LICENSE:         GPL - See COPYING in the top level directory
   4  * FILE:            ntoskrnl/ex/harderr.c
   5  * PURPOSE:         Error Functions and Status/Exception Dispatching/Raising
   6  * PROGRAMMERS:     Alex Ionescu (alex@relsoft.net)
   7  */
   8
   9 /* INCLUDES *****************************************************************/
  10
  11 #include <ntoskrnl.h>
  12 #define NDEBUG
  13 #include <debug.h>
  14
  15 #define TAG_ERR ' rrE'
  16
  17 /* GLOBALS ****************************************************************/
  18
  19 BOOLEAN ExReadyForErrors = FALSE;
  20 PVOID ExpDefaultErrorPort = NULL;
  21 PEPROCESS ExpDefaultErrorPortProcess = NULL;
  22
  23 /* FUNCTIONS ****************************************************************/
  24
  25 /*++
  26 * @name ExpSystemErrorHandler
  27 *
  28 * For now it's a stub
  29 *
  30 * @param ErrorStatus
  31 *        FILLME
  32 *
  33 * @param NumberOfParameters
  34 *        FILLME
  35 *
  36 * @param UnicodeStringParameterMask
  37 *        FILLME
  38 *
  39 * @param Parameters
  40 *        FILLME
  41 *
  42 * @param ValidResponseOptions
  43 *        FILLME
  44 *
  45 * @param Response
  46 *        FILLME
  47 *
  48 * @return None
  49 *
  50 * @remarks None
  51 *
  52 *--*/
  53 NTSTATUS
  54 NTAPI
  55 ExpSystemErrorHandler(IN NTSTATUS ErrorStatus,
  56                       IN ULONG NumberOfParameters,
  57                       IN ULONG UnicodeStringParameterMask,
  58                       IN PULONG_PTR Parameters,
  59                       IN BOOLEAN Shutdown)
  60 {
  61     ULONG_PTR BugCheckParameters[MAXIMUM_HARDERROR_PARAMETERS] = {0, 0, 0, 0};
  62     ULONG i;
  63
  64     /* Sanity check */
  65     ASSERT(NumberOfParameters <= MAXIMUM_HARDERROR_PARAMETERS);
  66
  67     /*
  68      * KeBugCheck expects MAXIMUM_HARDERROR_PARAMETERS parameters,
  69      * but we might get called with less, so use a local buffer here.
  70      */
  71     for (i = 0; i < NumberOfParameters; i++)
  72     {
  73         /* Copy them over */
  74         BugCheckParameters[i] = Parameters[i];
  75     }
  76
  77     /* FIXME: STUB */
  78     KeBugCheckEx(FATAL_UNHANDLED_HARD_ERROR,
  79                  ErrorStatus,
  80                  (ULONG_PTR)BugCheckParameters,
  81                  0,
  82                  0);
  83     return STATUS_SUCCESS;
  84 }
  85
  86 /*++
  87  * @name ExpRaiseHardError
  88  *
  89  * For now it's a stub
  90  *
  91  * @param ErrorStatus
  92  *        FILLME
  93  *
  94  * @param NumberOfParameters
  95  *        FILLME
  96  *
  97  * @param UnicodeStringParameterMask
  98  *        FILLME
  99  *
 100  * @param Parameters
 101  *        FILLME
 102  *
 103  * @param ValidResponseOptions
 104  *        FILLME
 105  *
 106  * @param Response
 107  *        FILLME
 108  *
 109  * @return None
 110  *
 111  * @remarks None
 112  *
 113  *--*/
 114 NTSTATUS
 115 NTAPI
 116 ExpRaiseHardError(IN NTSTATUS ErrorStatus,
 117                   IN ULONG NumberOfParameters,
 118                   IN ULONG UnicodeStringParameterMask,
 119                   IN PULONG_PTR Parameters,
 120                   IN ULONG ValidResponseOptions,
 121                   OUT PULONG Response)
 122 {
 123     PEPROCESS Process = PsGetCurrentProcess();
 124     PETHREAD Thread = PsGetCurrentThread();
 125     UCHAR Buffer[PORT_MAXIMUM_MESSAGE_LENGTH];
 126     PHARDERROR_MSG Message = (PHARDERROR_MSG)Buffer;
 127     NTSTATUS Status;
 128     HANDLE PortHandle;
 129     KPROCESSOR_MODE PreviousMode = KeGetPreviousMode();
 130     PAGED_CODE();
 131
 132     /* Check if this error will shutdown the system */
 133     if (ValidResponseOptions == OptionShutdownSystem)
 134     {
 135         /* Check for privilege */
 136         if (!SeSinglePrivilegeCheck(SeShutdownPrivilege, PreviousMode))
 137         {
 138             /* No rights */
 139             *Response = ResponseNotHandled;
 140             return STATUS_PRIVILEGE_NOT_HELD;
 141         }
 142
 143         /* Don't handle any new hard errors */
 144         ExReadyForErrors = FALSE;
 145     }
 146
 147     /* Check if hard errors are not disabled */
 148     if (!Thread->HardErrorsAreDisabled)
 149     {
 150         /* Check if we can't do errors anymore, and this is serious */
 151         if ((!ExReadyForErrors) && (NT_ERROR(ErrorStatus)))
 152         {
 153             /* Use the system handler */
 154             ExpSystemErrorHandler(ErrorStatus,
 155                                   NumberOfParameters,
 156                                   UnicodeStringParameterMask,
 157                                   Parameters,
 158                                   (PreviousMode != KernelMode) ? TRUE: FALSE);
 159         }
 160     }
 161
 162     /* Enable hard error processing if it is enabled for the process
 163      * or if the exception status forces it */
 164     if ((Process->DefaultHardErrorProcessing & 1) ||
 165         (ErrorStatus & 0x10000000))
 166     {
 167         /* Check if we have an exception port */
 168         if (Process->ExceptionPort)
 169         {
 170             /* Use the port */
 171             PortHandle = Process->ExceptionPort;
 172         }
 173         else
 174         {
 175             /* Use our default system port */
 176             PortHandle = ExpDefaultErrorPort;
 177         }
 178     }
 179     else
 180     {
 181         /* Don't process the error */
 182         PortHandle = NULL;
 183     }
 184
 185     /* If hard errors are disabled, do nothing */
 186     if (Thread->HardErrorsAreDisabled) PortHandle = NULL;
 187
 188     /* Now check if we have a port */
 189     if (PortHandle)
 190     {
 191         /* Check if this is the default process */
 192         if (Process == ExpDefaultErrorPortProcess)
 193         {
 194             /* We can't handle the error, check if this is critical */
 195             if (NT_ERROR(ErrorStatus))
 196             {
 197                 /* It is, invoke the system handler */
 198                 ExpSystemErrorHandler(ErrorStatus,
 199                                       NumberOfParameters,
 200                                       UnicodeStringParameterMask,
 201                                       Parameters,
 202                                       (PreviousMode != KernelMode) ? TRUE: FALSE);
 203
 204                 /* If we survived, return to caller */
 205                 *Response = ResponseReturnToCaller;
 206                 return STATUS_SUCCESS;
 207             }
 208         }
 209
 210         /* Setup the LPC Message */
 211         Message->h.u1.Length = (sizeof(HARDERROR_MSG) << 16) |
 212                                (sizeof(HARDERROR_MSG) - sizeof(PORT_MESSAGE));
 213         Message->h.u2.ZeroInit = 0;
 214         Message->h.u2.s2.Type = LPC_ERROR_EVENT;
 215         Message->Status = ErrorStatus &~ 0x10000000;
 216         Message->ValidResponseOptions = ValidResponseOptions;
 217         Message->UnicodeStringParameterMask = UnicodeStringParameterMask;
 218         Message->NumberOfParameters = NumberOfParameters;
 219         KeQuerySystemTime(&Message->ErrorTime);
 220
 221         /* Copy the parameters */
 222         if (Parameters) RtlMoveMemory(&Message->Parameters,
 223                                       Parameters,
 224                                       sizeof(ULONG_PTR) * NumberOfParameters);
 225
 226         /* Send the LPC Message */
 227         Status = LpcRequestWaitReplyPort(PortHandle,
 228                                          (PVOID)Message,
 229                                          (PVOID)Message);
 230         if (NT_SUCCESS(Status))
 231         {
 232             /* Check what kind of response we got */
 233             if ((Message->Response != ResponseReturnToCaller) &&
 234                 (Message->Response != ResponseNotHandled) &&
 235                 (Message->Response != ResponseAbort) &&
 236                 (Message->Response != ResponseCancel) &&
 237                 (Message->Response != ResponseIgnore) &&
 238                 (Message->Response != ResponseNo) &&
 239                 (Message->Response != ResponseOk) &&
 240                 (Message->Response != ResponseRetry) &&
 241                 (Message->Response != ResponseYes) &&
 242                 (Message->Response != ResponseTryAgain) &&
 243                 (Message->Response != ResponseContinue))
 244             {
 245                 /* Reset to a default one */
 246                 Message->Response = ResponseReturnToCaller;
 247             }
 248
 249             /* Set the response */
 250             *Response = Message->Response;
 251         }
 252         else
 253         {
 254             /* Set the response */
 255             *Response = ResponseReturnToCaller;
 256         }
 257     }
 258     else
 259     {
 260         /* Set defaults */
 261         *Response = ResponseReturnToCaller;
 262         Status = STATUS_SUCCESS;
 263     }
 264
 265     /* Return status */
 266     return Status;
 267 }
 268
 269 /*++
 270  * @name ExRaiseAccessViolation
 271  * @implemented
 272  *
 273  * The ExRaiseAccessViolation routine can be used with structured exception
 274  * handling to throw a driver-determined exception for a memory access
 275  * violation that occurs when a driver processes I/O requests.
 276  * See: http://msdn.microsoft.com/library/en-us/Kernel_r/hh/Kernel_r/k102_71b4c053-599c-4a6d-8a59-08aae6bdc534.xml.asp?frame=true
 277  *      http://www.osronline.com/ddkx/kmarch/k102_814i.htm
 278  *
 279  * @return None
 280  *
 281  * @remarks None
 282  *
 283  *--*/
 284 VOID
 285 NTAPI
 286 ExRaiseAccessViolation(VOID)
 287 {
 288     /* Raise the Right Status */
 289     RtlRaiseStatus(STATUS_ACCESS_VIOLATION);
 290 }
 291
 292 /*++
 293  * @name ExRaiseDatatypeMisalignment
 294  * @implemented
 295  *
 296  * ExRaiseDatatypeMisalignment raises an exception with the exception
 297  * code set to STATUS_DATATYPE_MISALIGNMENT
 298  * See: MSDN / DDK
 299  *      http://www.osronline.com/ddkx/kmarch/k102_814i.htm
 300  *
 301  * @return None
 302  *
 303  * @remarks None
 304  *
 305  *--*/
 306 VOID
 307 NTAPI
 308 ExRaiseDatatypeMisalignment(VOID)
 309 {
 310     /* Raise the Right Status */
 311     RtlRaiseStatus(STATUS_DATATYPE_MISALIGNMENT);
 312 }
 313
 314 /*++
 315  * @name ExSystemExceptionFilter
 316  * @implemented
 317  *
 318  * TODO: Add description
 319  *
 320  * @return FILLME
 321  *
 322  * @remarks None
 323  *
 324  *--*/
 325 LONG
 326 NTAPI
 327 ExSystemExceptionFilter(VOID)
 328 {
 329     return KeGetPreviousMode() != KernelMode ?
 330            EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH;
 331 }
 332
 333 /*++
 334  * @name ExRaiseHardError
 335  * @implemented
 336  *
 337  * See NtRaiseHardError
 338  *
 339  * @param ErrorStatus
 340  *        Error Code
 341  *
 342  * @param NumberOfParameters
 343  *        Number of optional parameters in Parameters array
 344  *
 345  * @param UnicodeStringParameterMask
 346  *        Optional string parameter (can be only one per error code)
 347  *
 348  * @param Parameters
 349  *        Array of ULONG parameters for use in error message string
 350  *
 351  * @param ValidResponseOptions
 352  *        See HARDERROR_RESPONSE_OPTION for possible values description
 353  *
 354  * @param Response
 355  *        Pointer to HARDERROR_RESPONSE enumeration
 356  *
 357  * @return None
 358  *
 359  * @remarks None
 360  *
 361  *--*/
 362 NTSTATUS
 363 NTAPI
 364 ExRaiseHardError(IN NTSTATUS ErrorStatus,
 365                  IN ULONG NumberOfParameters,
 366                  IN ULONG UnicodeStringParameterMask,
 367                  IN PULONG_PTR Parameters,
 368                  IN ULONG ValidResponseOptions,
 369                  OUT PULONG Response)
 370 {
 371     SIZE_T Size;
 372     UNICODE_STRING CapturedParams[MAXIMUM_HARDERROR_PARAMETERS];
 373     ULONG i;
 374     PVOID UserData = NULL;
 375     PHARDERROR_USER_PARAMETERS UserParams;
 376     PWSTR BufferBase;
 377     ULONG SafeResponse;
 378     NTSTATUS Status;
 379     PAGED_CODE();
 380
 381     /* Check if we have parameters */
 382     if (Parameters)
 383     {
 384         /* Check if we have strings */
 385         if (UnicodeStringParameterMask)
 386         {
 387             /* Calculate the required size */
 388             Size = FIELD_OFFSET(HARDERROR_USER_PARAMETERS, Buffer[0]);
 389
 390             /* Loop each parameter */
 391             for (i = 0; i < NumberOfParameters; i++)
 392             {
 393                 /* Check if it's part of the mask */
 394                 if (UnicodeStringParameterMask & (1 << i))
 395                 {
 396                     /* Copy it */
 397                     RtlMoveMemory(&CapturedParams[i],
 398                                   (PVOID)Parameters[i],
 399                                   sizeof(UNICODE_STRING));
 400
 401                     /* Increase the size */
 402                     Size += CapturedParams[i].MaximumLength;
 403                 }
 404             }
 405
 406             /* Allocate the user data region */
 407             Status = ZwAllocateVirtualMemory(NtCurrentProcess(),
 408                                              &UserData,
 409                                              0,
 410                                              &Size,
 411                                              MEM_COMMIT,
 412                                              PAGE_READWRITE);
 413             if (!NT_SUCCESS(Status)) return Status;
 414
 415             /* Set the pointers to our data */
 416             UserParams = UserData;
 417             BufferBase = UserParams->Buffer;
 418
 419             /* Loop parameters again */
 420             for (i = 0; i < NumberOfParameters; i++)
 421             {
 422                 /* Check if we're in the mask */
 423                 if (UnicodeStringParameterMask & (1 << i))
 424                 {
 425                     /* Update the base */
 426                     UserParams->Parameters[i] = (ULONG_PTR)&UserParams->Strings[i];
 427
 428                     /* Copy the string buffer */
 429                     RtlMoveMemory(BufferBase,
 430                                   CapturedParams[i].Buffer,
 431                                   CapturedParams[i].MaximumLength);
 432
 433                     /* Set buffer */
 434                     CapturedParams[i].Buffer = BufferBase;
 435
 436                     /* Copy the string structure */
 437                     UserParams->Strings[i] = CapturedParams[i];
 438
 439                     /* Update the pointer */
 440                     BufferBase += CapturedParams[i].MaximumLength;
 441                 }
 442                 else
 443                 {
 444                     /* No need to copy any strings */
 445                     UserParams->Parameters[i] = Parameters[i];
 446                 }
 447             }
 448         }
 449         else
 450         {
 451             /* Just keep the data as is */
 452             UserData = Parameters;
 453         }
 454     }
 455
 456     /* Now call the worker function */
 457     Status = ExpRaiseHardError(ErrorStatus,
 458                                NumberOfParameters,
 459                                UnicodeStringParameterMask,
 460                                UserData,
 461                                ValidResponseOptions,
 462                                &SafeResponse);
 463
 464     /* Check if we had done user-mode allocation */
 465     if ((UserData) && (UserData != Parameters))
 466     {
 467         /* We did! Delete it */
 468         Size = 0;
 469         ZwFreeVirtualMemory(NtCurrentProcess(),
 470                             &UserData,
 471                             &Size,
 472                             MEM_RELEASE);
 473     }
 474
 475     /* Return status and the response */
 476     *Response = SafeResponse;
 477     return Status;
 478 }
 479
 480 /*++
 481  * @name NtRaiseHardError
 482  * @implemented
 483  *
 484  * This function sends HARDERROR_MSG LPC message to listener
 485  * (typically CSRSS.EXE). See NtSetDefaultHardErrorPort for more information
 486  * See: http://undocumented.ntinternals.net/UserMode/Undocumented%20Functions/Error/NtRaiseHardError.html
 487  *
 488  * @param ErrorStatus
 489  *        Error Code
 490  *
 491  * @param NumberOfParameters
 492  *        Number of optional parameters in Parameters array
 493  *
 494  * @param UnicodeStringParameterMask
 495  *        Optional string parameter (can be only one per error code)
 496  *
 497  * @param Parameters
 498  *        Array of ULONG_PTR parameters for use in error message string
 499  *
 500  * @param ValidResponseOptions
 501  *        See HARDERROR_RESPONSE_OPTION for possible values description
 502  *
 503  * @param Response
 504  *        Pointer to HARDERROR_RESPONSE enumeration
 505  *
 506  * @return Status
 507  *
 508  * @remarks NtRaiseHardError is easy way to display message in GUI
 509  *          without loading Win32 API libraries
 510  *
 511  *--*/
 512 NTSTATUS
 513 NTAPI
 514 NtRaiseHardError(IN NTSTATUS ErrorStatus,
 515                  IN ULONG NumberOfParameters,
 516                  IN ULONG UnicodeStringParameterMask,
 517                  IN PULONG_PTR Parameters,
 518                  IN ULONG ValidResponseOptions,
 519                  OUT PULONG Response)
 520 {
 521     NTSTATUS Status = STATUS_SUCCESS;
 522     PULONG_PTR SafeParams = NULL;
 523     ULONG SafeResponse;
 524     UNICODE_STRING SafeString;
 525     ULONG i;
 526     ULONG ParamSize = 0;
 527     KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
 528
 529     /* Validate parameter count */
 530     if (NumberOfParameters > MAXIMUM_HARDERROR_PARAMETERS)
 531     {
 532         /* Fail */
 533         return STATUS_INVALID_PARAMETER_2;
 534     }
 535
 536     /* Make sure we have some at least */
 537     if ((Parameters != NULL) && (NumberOfParameters == 0))
 538     {
 539         /* Fail */
 540         return STATUS_INVALID_PARAMETER_2;
 541     }
 542
 543     /* Check if we were called from user-mode */
 544     if (PreviousMode != KernelMode)
 545     {
 546         /* First validate the responses */
 547         switch (ValidResponseOptions)
 548         {
 549             /* Check all valid cases */
 550             case OptionAbortRetryIgnore:
 551             case OptionOk:
 552             case OptionOkCancel:
 553             case OptionRetryCancel:
 554             case OptionYesNo:
 555             case OptionYesNoCancel:
 556             case OptionShutdownSystem:
 557                 break;
 558
 559             /* Anything else is invalid */
 560             default:
 561                 return STATUS_INVALID_PARAMETER_4;
 562         }
 563
 564         /* Check if we have parameters */
 565         if (Parameters)
 566         {
 567             /* Calculate size of the parameters */
 568             ParamSize = sizeof(ULONG_PTR) * NumberOfParameters;
 569
 570             /* Allocate a safe buffer */
 571             SafeParams = ExAllocatePoolWithTag(PagedPool, ParamSize, TAG_ERR);
 572             if (!SafeParams)
 573             {
 574                 return STATUS_INSUFFICIENT_RESOURCES;
 575             }
 576         }
 577
 578         /* Enter SEH Block */
 579         _SEH2_TRY
 580         {
 581             /* Validate the response pointer */
 582             ProbeForWriteUlong(Response);
 583
 584             /* Check if we have parameters */
 585             if (Parameters)
 586             {
 587                 /* Validate the parameter pointers */
 588                 ProbeForRead(Parameters, ParamSize, sizeof(ULONG_PTR));
 589
 590                 /* Copy them */
 591                 RtlCopyMemory(SafeParams, Parameters, ParamSize);
 592
 593                 /* Now check if there's strings in it */
 594                 if (UnicodeStringParameterMask)
 595                 {
 596                     /* Loop every string */
 597                     for (i = 0; i < NumberOfParameters; i++)
 598                     {
 599                         /* Check if this parameter is a string */
 600                         if (UnicodeStringParameterMask & (1 << i))
 601                         {
 602                             /* Probe the structure */
 603                             ProbeForRead((PVOID)SafeParams[i],
 604                                          sizeof(UNICODE_STRING),
 605                                          sizeof(ULONG_PTR));
 606
 607                             /* Capture it */
 608                             RtlCopyMemory(&SafeString,
 609                                           (PVOID)SafeParams[i],
 610                                           sizeof(UNICODE_STRING));
 611
 612                             /* Probe the buffer */
 613                             ProbeForRead(SafeString.Buffer,
 614                                          SafeString.MaximumLength,
 615                                          sizeof(UCHAR));
 616                         }
 617                     }
 618                 }
 619             }
 620         }
 621         _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
 622         {
 623             /* Free captured buffer */
 624             if (SafeParams) ExFreePoolWithTag(SafeParams, TAG_ERR);
 625
 626             /* Return the exception code */
 627             _SEH2_YIELD(return _SEH2_GetExceptionCode());
 628         }
 629         _SEH2_END;
 630
 631         /* Call the system function directly, because we probed */
 632         ExpRaiseHardError(ErrorStatus,
 633                           NumberOfParameters,
 634                           UnicodeStringParameterMask,
 635                           SafeParams,
 636                           ValidResponseOptions,
 637                           &SafeResponse);
 638     }
 639     else
 640     {
 641         /* Reuse variable */
 642         SafeParams = Parameters;
 643
 644         /*
 645          * Call the Executive Function. It will probe and copy pointers to
 646          * user-mode
 647          */
 648         ExRaiseHardError(ErrorStatus,
 649                          NumberOfParameters,
 650                          UnicodeStringParameterMask,
 651                          SafeParams,
 652                          ValidResponseOptions,
 653                          &SafeResponse);
 654     }
 655
 656     /* Check if we were called in user-mode */
 657     if (PreviousMode != KernelMode)
 658     {
 659         /* That means we have a buffer to free */
 660         if (SafeParams) ExFreePoolWithTag(SafeParams, TAG_ERR);
 661
 662         /* Enter SEH Block for return */
 663         _SEH2_TRY
 664         {
 665             /* Return the response */
 666             *Response = SafeResponse;
 667         }
 668         _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
 669         {
 670             /* Get the exception code */
 671             Status = _SEH2_GetExceptionCode();
 672         }
 673         _SEH2_END;
 674     }
 675     else
 676     {
 677         /* Return the response */
 678         *Response = SafeResponse;
 679     }
 680
 681     /* Return status */
 682     return Status;
 683 }
 684
 685 /*++
 686  * @name NtSetDefaultHardErrorPort
 687  * @implemented
 688  *
 689  * NtSetDefaultHardErrorPort is typically called only once. After call,
 690  * kernel set BOOLEAN flag named _ExReadyForErrors to TRUE, and all other
 691  * tries to change default port are broken with STATUS_UNSUCCESSFUL error code
 692  * See: http://www.windowsitlibrary.com/Content/356/08/2.html
 693  *      http://undocumented.ntinternals.net/UserMode/Undocumented%20Functions/Error/NtSetDefaultHardErrorPort.html
 694  *
 695  * @param PortHandle
 696  *        Handle to named port object
 697  *
 698  * @return Status
 699  *
 700  * @remarks Privileges: SE_TCB_PRIVILEGE
 701  *
 702  *--*/
 703 NTSTATUS
 704 NTAPI
 705 NtSetDefaultHardErrorPort(IN HANDLE PortHandle)
 706 {
 707     KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
 708     NTSTATUS Status = STATUS_UNSUCCESSFUL;
 709
 710     /* Check if we have the Privilege */
 711     if (!SeSinglePrivilegeCheck(SeTcbPrivilege, PreviousMode))
 712     {
 713         DPRINT1("NtSetDefaultHardErrorPort: Caller requires "
 714                 "the SeTcbPrivilege privilege!\n");
 715         return STATUS_PRIVILEGE_NOT_HELD;
 716     }
 717
 718     /* Only called once during bootup, make sure we weren't called yet */
 719     if (!ExReadyForErrors)
 720     {
 721         /* Reference the port */
 722         Status = ObReferenceObjectByHandle(PortHandle,
 723                                            0,
 724                                            LpcPortObjectType,
 725                                            PreviousMode,
 726                                            (PVOID*)&ExpDefaultErrorPort,
 727                                            NULL);
 728         if (NT_SUCCESS(Status))
 729         {
 730             /* Save the data */
 731             ExpDefaultErrorPortProcess = PsGetCurrentProcess();
 732             ExReadyForErrors = TRUE;
 733         }
 734     }
 735
 736     /* Return status to caller */
 737     return Status;
 738 }
 739
 740 VOID
 741 __cdecl
 742 _purecall(VOID)
 743 {
 744     /* Not supported in Kernel Mode */
 745     RtlRaiseStatus(STATUS_NOT_IMPLEMENTED);
 746 }
 747
 748 /* EOF */