ntoskrnl/ob/handle.c

   1 /*
   2  *  ReactOS kernel
   3  *  Copyright (C) 1998, 1999, 2000, 2001 ReactOS Team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19 /* $Id$
  20  *
  21  * COPYRIGHT:          See COPYING in the top level directory
  22  * PROJECT:            ReactOS kernel
  23  * FILE:               ntoskrnl/ob/handle.c
  24  * PURPOSE:            Managing handles
  25  * PROGRAMMER:         David Welch (welch@cwcom.net)
  26  * REVISION HISTORY:
  27  *                 17/06/98: Created
  28  */
  29
  30 /* INCLUDES ****************************************************************/
  31
  32 #include <ddk/ntddk.h>
  33 #include <internal/ob.h>
  34 #include <internal/ps.h>
  35 #include <internal/pool.h>
  36 #include <internal/safe.h>
  37
  38 #define NDEBUG
  39 #include <internal/debug.h>
  40
  41 /* TYPES *******************************************************************/
  42
  43 /*
  44  * PURPOSE: Defines a handle
  45  */
  46 typedef struct
  47 {
  48    PVOID ObjectBody;
  49    ACCESS_MASK GrantedAccess;
  50    BOOLEAN Inherit;
  51 } HANDLE_REP, *PHANDLE_REP;
  52
  53 #define HANDLE_BLOCK_ENTRIES ((PAGE_SIZE-sizeof(LIST_ENTRY))/sizeof(HANDLE_REP))
  54
  55
  56 /*
  57  * PURPOSE: Defines a page's worth of handles
  58  */
  59 typedef struct
  60 {
  61    LIST_ENTRY entry;
  62    HANDLE_REP handles[HANDLE_BLOCK_ENTRIES];
  63 } HANDLE_BLOCK, *PHANDLE_BLOCK;
  64
  65
  66 /* GLOBALS *******************************************************************/
  67
  68 #define TAG_HANDLE_TABLE    TAG('H', 'T', 'B', 'L')
  69
  70 /* FUNCTIONS ***************************************************************/
  71
  72
  73 static PHANDLE_REP ObpGetObjectByHandle(PHANDLE_TABLE HandleTable, HANDLE h)
  74 /*
  75  * FUNCTION: Get the data structure for a handle
  76  * ARGUMENTS:
  77  *         Process = Process to get the handle for
  78  *         h = Handle
  79  * ARGUMENTS: A pointer to the information about the handle on success,
  80  *            NULL on failure
  81  */
  82 {
  83    PLIST_ENTRY current;
  84    unsigned int handle = (((unsigned int)h) >> 2) - 1;
  85    unsigned int count=handle/HANDLE_BLOCK_ENTRIES;
  86    HANDLE_BLOCK* blk = NULL;
  87    unsigned int i;
  88
  89    DPRINT("ObpGetObjectByHandle(HandleTable %x, h %x)\n",HandleTable,h);
  90
  91    current = HandleTable->ListHead.Flink;
  92    DPRINT("current %x\n",current);
  93
  94    for (i=0;i<count;i++)
  95      {
  96         current = current->Flink;
  97         if (current == (&(HandleTable->ListHead)))
  98           {
  99              return(NULL);
 100           }
 101      }
 102
 103    blk = CONTAINING_RECORD(current,HANDLE_BLOCK,entry);
 104    DPRINT("object: %p\n",&(blk->handles[handle%HANDLE_BLOCK_ENTRIES]));
 105    return(&(blk->handles[handle%HANDLE_BLOCK_ENTRIES]));
 106 }
 107
 108 #ifndef LIBCAPTIVE
 109
 110 NTSTATUS
 111 ObDuplicateObject(PEPROCESS SourceProcess,
 112                   PEPROCESS TargetProcess,
 113                   HANDLE SourceHandle,
 114                   PHANDLE TargetHandle,
 115                   ACCESS_MASK DesiredAccess,
 116                   BOOLEAN InheritHandle,
 117                   ULONG Options)
 118 {
 119   KIRQL oldIrql;
 120   PHANDLE_REP SourceHandleRep;
 121   PVOID ObjectBody;
 122
 123   KeAcquireSpinLock(&SourceProcess->HandleTable.ListLock, &oldIrql);
 124   SourceHandleRep = ObpGetObjectByHandle(&SourceProcess->HandleTable,
 125                                          SourceHandle);
 126   if (SourceHandleRep == NULL)
 127     {
 128       KeReleaseSpinLock(&SourceProcess->HandleTable.ListLock, oldIrql);
 129       return(STATUS_INVALID_HANDLE);
 130     }
 131   ObjectBody = SourceHandleRep->ObjectBody;
 132   ObReferenceObjectByPointer(ObjectBody,
 133                              0,
 134                              NULL,
 135                              UserMode);
 136
 137   if (Options & DUPLICATE_SAME_ACCESS)
 138     {
 139       DesiredAccess = SourceHandleRep->GrantedAccess;
 140     }
 141
 142   KeReleaseSpinLock(&SourceProcess->HandleTable.ListLock, oldIrql);
 143   ObCreateHandle(TargetProcess,
 144                  ObjectBody,
 145                  DesiredAccess,
 146                  InheritHandle,
 147                  TargetHandle);
 148
 149   if (Options & DUPLICATE_CLOSE_SOURCE)
 150     {
 151       ZwClose(SourceHandle);
 152     }
 153
 154   ObDereferenceObject(ObjectBody);
 155   return(STATUS_SUCCESS);
 156 }
 157
 158 NTSTATUS STDCALL
 159 NtDuplicateObject (IN   HANDLE          SourceProcessHandle,
 160                    IN   HANDLE          SourceHandle,
 161                    IN   HANDLE          TargetProcessHandle,
 162                    OUT  PHANDLE         UnsafeTargetHandle,
 163                    IN   ACCESS_MASK     DesiredAccess,
 164                    IN   BOOLEAN         InheritHandle,
 165                    ULONG                Options)
 166 /*
 167  * FUNCTION: Copies a handle from one process space to another
 168  * ARGUMENTS:
 169  *         SourceProcessHandle = The source process owning the handle. The
 170  *                               source process should have opened
 171  *                               the SourceHandle with PROCESS_DUP_HANDLE
 172  *                               access.
 173  *         SourceHandle = The handle to the object.
 174  *         TargetProcessHandle = The destination process owning the handle
 175  *         TargetHandle (OUT) = Caller should supply storage for the
 176  *                              duplicated handle.
 177  *         DesiredAccess = The desired access to the handle.
 178  *         InheritHandle = Indicates wheter the new handle will be inheritable
 179  *                         or not.
 180  *         Options = Specifies special actions upon duplicating the handle.
 181  *                   Can be one of the values DUPLICATE_CLOSE_SOURCE |
 182  *                   DUPLICATE_SAME_ACCESS. DUPLICATE_CLOSE_SOURCE specifies
 183  *                   that the source handle should be closed after duplicating.
 184  *                   DUPLICATE_SAME_ACCESS specifies to ignore the
 185  *                   DesiredAccess paramter and just grant the same access to
 186  *                   the new handle.
 187  * RETURNS: Status
 188  * REMARKS: This function maps to the win32 DuplicateHandle.
 189  */
 190 {
 191    PEPROCESS SourceProcess;
 192    PEPROCESS TargetProcess;
 193    PHANDLE_REP SourceHandleRep;
 194    KIRQL oldIrql;
 195    PVOID ObjectBody;
 196    HANDLE TargetHandle;
 197    NTSTATUS Status;
 198
 199    ASSERT_IRQL(PASSIVE_LEVEL);
 200
 201    Status = ObReferenceObjectByHandle(SourceProcessHandle,
 202                                       PROCESS_DUP_HANDLE,
 203                                       NULL,
 204                                       UserMode,
 205                                       (PVOID*)&SourceProcess,
 206                                       NULL);
 207    if (!NT_SUCCESS(Status))
 208      {
 209        return(Status);
 210      }
 211    Status = ObReferenceObjectByHandle(TargetProcessHandle,
 212                                       PROCESS_DUP_HANDLE,
 213                                       NULL,
 214                                       UserMode,
 215                                       (PVOID*)&TargetProcess,
 216                                       NULL);
 217    if (!NT_SUCCESS(Status))
 218      {
 219        ObDereferenceObject(SourceProcess);
 220        return(Status);
 221      }
 222    KeAcquireSpinLock(&SourceProcess->HandleTable.ListLock, &oldIrql);
 223    SourceHandleRep = ObpGetObjectByHandle(&SourceProcess->HandleTable,
 224                                           SourceHandle);
 225    if (SourceHandleRep == NULL)
 226      {
 227         KeReleaseSpinLock(&SourceProcess->HandleTable.ListLock, oldIrql);
 228         ObDereferenceObject(SourceProcess);
 229         ObDereferenceObject(TargetProcess);
 230         return(STATUS_INVALID_HANDLE);
 231      }
 232    ObjectBody = SourceHandleRep->ObjectBody;
 233    ObReferenceObjectByPointer(ObjectBody,
 234                               0,
 235                               NULL,
 236                               UserMode);
 237
 238    if (Options & DUPLICATE_SAME_ACCESS)
 239      {
 240         DesiredAccess = SourceHandleRep->GrantedAccess;
 241      }
 242
 243    KeReleaseSpinLock(&SourceProcess->HandleTable.ListLock, oldIrql);
 244    if (!SourceHandleRep->Inherit)
 245      {
 246        ObDereferenceObject(TargetProcess);
 247        ObDereferenceObject(SourceProcess);
 248        ObDereferenceObject(ObjectBody);
 249        return STATUS_INVALID_HANDLE;
 250      }
 251    ObCreateHandle(TargetProcess,
 252                   ObjectBody,
 253                   DesiredAccess,
 254                   InheritHandle,
 255                   &TargetHandle);
 256
 257    if (Options & DUPLICATE_CLOSE_SOURCE)
 258      {
 259         ZwClose(SourceHandle);
 260      }
 261
 262    ObDereferenceObject(TargetProcess);
 263    ObDereferenceObject(SourceProcess);
 264    ObDereferenceObject(ObjectBody);
 265
 266    Status = MmCopyToCaller(UnsafeTargetHandle, &TargetHandle, sizeof(HANDLE));
 267    if (!NT_SUCCESS(Status))
 268      {
 269        return(Status);
 270      }
 271
 272    return(STATUS_SUCCESS);
 273 }
 274
 275 VOID ObCloseAllHandles(PEPROCESS Process)
 276 {
 277    KIRQL oldIrql;
 278    PHANDLE_TABLE HandleTable;
 279    PLIST_ENTRY current_entry;
 280    PHANDLE_BLOCK current;
 281    ULONG i;
 282    PVOID ObjectBody;
 283    BOOLEAN IsProcessHandle;
 284
 285    DPRINT("ObCloseAllHandles(Process %x)\n", Process);
 286
 287    HandleTable = &Process->HandleTable;
 288
 289    KeAcquireSpinLock(&HandleTable->ListLock, &oldIrql);
 290
 291    current_entry = HandleTable->ListHead.Flink;
 292
 293    while (current_entry != &HandleTable->ListHead)
 294      {
 295         current = CONTAINING_RECORD(current_entry, HANDLE_BLOCK, entry);
 296
 297         for (i = 0; i < HANDLE_BLOCK_ENTRIES; i++)
 298           {
 299              ObjectBody = current->handles[i].ObjectBody;
 300
 301              if (ObjectBody != NULL)
 302                {
 303                   POBJECT_HEADER Header = BODY_TO_HEADER(ObjectBody);
 304
 305                   if (Header->ObjectType == PsProcessType ||
 306                       Header->ObjectType == PsThreadType)
 307                     {
 308                        DPRINT("Deleting handle to %x\n", ObjectBody);
 309                     }
 310
 311                   ObReferenceObjectByPointer(ObjectBody,
 312                                              0,
 313                                              NULL,
 314                                              UserMode);
 315                   InterlockedDecrement(&Header->HandleCount);
 316                   current->handles[i].ObjectBody = NULL;
 317
 318                   KeReleaseSpinLock(&HandleTable->ListLock, oldIrql);
 319
 320                   if (Header->ObjectType == PsProcessType)
 321                   {
 322                      IsProcessHandle = TRUE;
 323                      KeDetachProcess();
 324                   }
 325                   else
 326                   {
 327                      IsProcessHandle = FALSE;
 328                   }
 329                   if ((Header->ObjectType != NULL) &&
 330                       (Header->ObjectType->Close != NULL))
 331                     {
 332                        Header->ObjectType->Close(ObjectBody,
 333                                                  Header->HandleCount);
 334                     }
 335
 336                   ObDereferenceObject(ObjectBody);
 337                   if (IsProcessHandle)
 338                   {
 339                      KeAttachProcess(Process);
 340                   }
 341                   KeAcquireSpinLock(&HandleTable->ListLock, &oldIrql);
 342                   current_entry = &HandleTable->ListHead;
 343                   break;
 344                }
 345           }
 346
 347         current_entry = current_entry->Flink;
 348      }
 349    KeReleaseSpinLock(&HandleTable->ListLock, oldIrql);
 350    DPRINT("ObCloseAllHandles() finished\n");
 351    DPRINT("Type %x\n", BODY_TO_HEADER(Process)->ObjectType);
 352 }
 353
 354 VOID ObDeleteHandleTable(PEPROCESS Process)
 355 /*
 356  * FUNCTION: Deletes the handle table associated with a process
 357  */
 358 {
 359    PLIST_ENTRY current = NULL;
 360    PHANDLE_TABLE HandleTable = NULL;
 361
 362    ObCloseAllHandles(Process);
 363
 364    HandleTable = &Process->HandleTable;
 365    current = RemoveHeadList(&HandleTable->ListHead);
 366
 367    while (current != &HandleTable->ListHead)
 368      {
 369         HANDLE_BLOCK* HandleBlock = CONTAINING_RECORD(current,
 370                                                       HANDLE_BLOCK,
 371                                                       entry);
 372         DPRINT("Freeing %x\n", HandleBlock);
 373         ExFreePool(HandleBlock);
 374
 375         current = RemoveHeadList(&HandleTable->ListHead);
 376      }
 377 }
 378
 379 #endif /* LIBCAPTIVE */
 380
 381 VOID ObCreateHandleTable(PEPROCESS Parent,
 382                          BOOLEAN Inherit,
 383                          PEPROCESS Process)
 384 /*
 385  * FUNCTION: Creates a handle table for a process
 386  * ARGUMENTS:
 387  *       Parent = Parent process (or NULL if this is the first process)
 388  *       Inherit = True if the process should inherit its parent's handles
 389  *       Process = Process whose handle table is to be created
 390  */
 391 {
 392    PHANDLE_TABLE ParentHandleTable, HandleTable;
 393    KIRQL oldIrql;
 394    PLIST_ENTRY parent_current;
 395    ULONG i;
 396    PHANDLE_BLOCK current_block, new_block;
 397
 398    DPRINT("ObCreateHandleTable(Parent %x, Inherit %d, Process %x)\n",
 399           Parent,Inherit,Process);
 400
 401    InitializeListHead(&(Process->HandleTable.ListHead));
 402    KeInitializeSpinLock(&(Process->HandleTable.ListLock));
 403
 404    if (Parent != NULL)
 405      {
 406         ParentHandleTable = &Parent->HandleTable;
 407         HandleTable = &Process->HandleTable;
 408
 409         KeAcquireSpinLock(&Parent->HandleTable.ListLock, &oldIrql);
 410         KeAcquireSpinLockAtDpcLevel(&Process->HandleTable.ListLock);
 411
 412         parent_current = ParentHandleTable->ListHead.Flink;
 413
 414         while (parent_current != &ParentHandleTable->ListHead)
 415           {
 416              current_block = CONTAINING_RECORD(parent_current,
 417                                                HANDLE_BLOCK,
 418                                                entry);
 419              new_block = ExAllocatePoolWithTag(NonPagedPool,
 420                                                sizeof(HANDLE_BLOCK),
 421                                                TAG_HANDLE_TABLE);
 422              if (new_block == NULL)
 423              {
 424                 break;
 425              }
 426              RtlZeroMemory(new_block, sizeof(HANDLE_BLOCK));
 427
 428              for (i=0; i<HANDLE_BLOCK_ENTRIES; i++)
 429              {
 430                 if (current_block->handles[i].ObjectBody)
 431                 {
 432                    if (current_block->handles[i].Inherit && Inherit)
 433                    {
 434                       new_block->handles[i].ObjectBody =
 435                         current_block->handles[i].ObjectBody;
 436                       new_block->handles[i].GrantedAccess =
 437                         current_block->handles[i].GrantedAccess;
 438                       new_block->handles[i].Inherit = TRUE;
 439                       InterlockedIncrement(&(BODY_TO_HEADER(current_block->handles[i].ObjectBody)->HandleCount));
 440                    }
 441                 }
 442              }
 443              InsertTailList(&Process->HandleTable.ListHead, &new_block->entry);
 444              parent_current = parent_current->Flink;
 445           }
 446         KeReleaseSpinLockFromDpcLevel(&Process->HandleTable.ListLock);
 447         KeReleaseSpinLock(&Parent->HandleTable.ListLock, oldIrql);
 448      }
 449 }
 450
 451
 452 PVOID ObDeleteHandle(PEPROCESS Process, HANDLE Handle)
 453 {
 454    PHANDLE_REP Rep;
 455    PVOID ObjectBody;
 456    KIRQL oldIrql;
 457    PHANDLE_TABLE HandleTable;
 458    POBJECT_HEADER Header;
 459
 460    DPRINT("ObDeleteHandle(Handle %x)\n",Handle);
 461
 462    HandleTable = &Process->HandleTable;
 463
 464    KeAcquireSpinLock(&HandleTable->ListLock, &oldIrql);
 465
 466    Rep = ObpGetObjectByHandle(HandleTable, Handle);
 467    if (Rep == NULL)
 468      {
 469         KeReleaseSpinLock(&HandleTable->ListLock, oldIrql);
 470         return(NULL);
 471      }
 472
 473    ObjectBody = Rep->ObjectBody;
 474    DPRINT("ObjectBody %x\n", ObjectBody);
 475    if (ObjectBody != NULL)
 476      {
 477         Header = BODY_TO_HEADER(ObjectBody);
 478         InterlockedDecrement(&(BODY_TO_HEADER(ObjectBody)->HandleCount));
 479         ObReferenceObjectByPointer(ObjectBody,
 480                                    0,
 481                                    NULL,
 482                                    UserMode);
 483         Rep->ObjectBody = NULL;
 484
 485         KeReleaseSpinLock(&HandleTable->ListLock, oldIrql);
 486
 487         if ((Header->ObjectType != NULL) &&
 488             (Header->ObjectType->Close != NULL))
 489           {
 490              Header->ObjectType->Close(ObjectBody, Header->HandleCount);
 491           }
 492      }
 493    else
 494      {
 495         KeReleaseSpinLock(&HandleTable->ListLock, oldIrql);
 496      }
 497
 498    DPRINT("Finished ObDeleteHandle()\n");
 499    return(ObjectBody);
 500 }
 501
 502
 503 NTSTATUS ObCreateHandle(PEPROCESS Process,
 504                         PVOID ObjectBody,
 505                         ACCESS_MASK GrantedAccess,
 506                         BOOLEAN Inherit,
 507                         PHANDLE HandleReturn)
 508 /*
 509  * FUNCTION: Add a handle referencing an object
 510  * ARGUMENTS:
 511  *         obj = Object body that the handle should refer to
 512  * RETURNS: The created handle
 513  * NOTE: The handle is valid only in the context of the current process
 514  */
 515 {
 516    LIST_ENTRY* current;
 517    unsigned int handle=1;
 518    unsigned int i;
 519    HANDLE_BLOCK* new_blk = NULL;
 520    PHANDLE_TABLE HandleTable;
 521    KIRQL oldlvl;
 522
 523    DPRINT("ObCreateHandle(Process %x, obj %x)\n",Process,ObjectBody);
 524
 525    assert(Process);
 526
 527    if (ObjectBody != NULL)
 528      {
 529         InterlockedIncrement(&(BODY_TO_HEADER(ObjectBody)->HandleCount));
 530      }
 531    HandleTable = &Process->HandleTable;
 532    KeAcquireSpinLock(&HandleTable->ListLock, &oldlvl);
 533    current = HandleTable->ListHead.Flink;
 534    /*
 535     * Scan through the currently allocated handle blocks looking for a free
 536     * slot
 537     */
 538    while (current != (&HandleTable->ListHead))
 539      {
 540         HANDLE_BLOCK* blk = CONTAINING_RECORD(current,HANDLE_BLOCK,entry);
 541
 542         DPRINT("Current %x\n",current);
 543
 544         for (i=0;i<HANDLE_BLOCK_ENTRIES;i++)
 545           {
 546              DPRINT("Considering slot %d containing %x\n",i,blk->handles[i]);
 547              if (blk->handles[i].ObjectBody==NULL)
 548                {
 549                   blk->handles[i].ObjectBody = ObjectBody;
 550                   blk->handles[i].GrantedAccess = GrantedAccess;
 551                   blk->handles[i].Inherit = Inherit;
 552                   KeReleaseSpinLock(&HandleTable->ListLock, oldlvl);
 553                   *HandleReturn = (HANDLE)((handle + i) << 2);
 554                   return(STATUS_SUCCESS);
 555                }
 556           }
 557
 558         handle = handle + HANDLE_BLOCK_ENTRIES;
 559         current = current->Flink;
 560      }
 561
 562    /*
 563     * Add a new handle block to the end of the list
 564     */
 565    new_blk =
 566      (HANDLE_BLOCK *)ExAllocatePoolWithTag(NonPagedPool,sizeof(HANDLE_BLOCK),
 567                                            TAG_HANDLE_TABLE);
 568    if (!new_blk)
 569     {
 570       *HandleReturn = (PHANDLE)NULL;
 571       return(STATUS_INSUFFICIENT_RESOURCES);
 572     }
 573    RtlZeroMemory(new_blk,sizeof(HANDLE_BLOCK));
 574    InsertTailList(&(Process->HandleTable.ListHead),
 575                   &new_blk->entry);
 576    new_blk->handles[0].ObjectBody = ObjectBody;
 577    new_blk->handles[0].GrantedAccess = GrantedAccess;
 578    new_blk->handles[0].Inherit = Inherit;
 579    KeReleaseSpinLock(&HandleTable->ListLock, oldlvl);
 580    *HandleReturn = (HANDLE)(handle << 2);
 581    return(STATUS_SUCCESS);
 582 }
 583
 584
 585 NTSTATUS STDCALL
 586 ObReferenceObjectByHandle(HANDLE Handle,
 587                           ACCESS_MASK DesiredAccess,
 588                           POBJECT_TYPE ObjectType,
 589                           KPROCESSOR_MODE AccessMode,
 590                           PVOID* Object,
 591                           POBJECT_HANDLE_INFORMATION HandleInformationPtr)
 592 /*
 593  * FUNCTION: Increments the reference count for an object and returns a
 594  * pointer to its body
 595  * ARGUMENTS:
 596  *         Handle = Handle for the object
 597  *         DesiredAccess = Desired access to the object
 598  *         ObjectType
 599  *         AccessMode
 600  *         Object (OUT) = Points to the object body on return
 601  *         HandleInformation (OUT) = Contains information about the handle
 602  *                                   on return
 603  * RETURNS: Status
 604  */
 605 {
 606    PHANDLE_REP HandleRep;
 607    POBJECT_HEADER ObjectHeader;
 608    KIRQL oldIrql;
 609    PVOID ObjectBody;
 610    ACCESS_MASK GrantedAccess;
 611
 612    ASSERT_IRQL(PASSIVE_LEVEL);
 613
 614    DPRINT("ObReferenceObjectByHandle(Handle %x, DesiredAccess %x, "
 615            "ObjectType %x, AccessMode %d, Object %x)\n",Handle,DesiredAccess,
 616            ObjectType,AccessMode,Object);
 617
 618
 619    /*
 620     * Handle special handle names
 621     */
 622    if (Handle == NtCurrentProcess() &&
 623        (ObjectType == PsProcessType || ObjectType == NULL))
 624      {
 625         DPRINT("Reference from %x\n", ((PULONG)&Handle)[-1]);
 626
 627         ObReferenceObjectByPointer(PsGetCurrentProcess(),
 628                                    PROCESS_ALL_ACCESS,
 629                                    PsProcessType,
 630                                    UserMode);
 631         *Object = PsGetCurrentProcess();
 632         DPRINT("Referencing current process %x\n", PsGetCurrentProcess());
 633         return(STATUS_SUCCESS);
 634      }
 635    else if (Handle == NtCurrentProcess())
 636      {
 637         CHECKPOINT;
 638         return(STATUS_OBJECT_TYPE_MISMATCH);
 639      }
 640    if (Handle == NtCurrentThread() &&
 641        (ObjectType == PsThreadType || ObjectType == NULL))
 642      {
 643         ObReferenceObjectByPointer(PsGetCurrentThread(),
 644                                    THREAD_ALL_ACCESS,
 645                                    PsThreadType,
 646                                    UserMode);
 647         *Object = PsGetCurrentThread();
 648         CHECKPOINT;
 649         return(STATUS_SUCCESS);
 650      }
 651    else if (Handle == NtCurrentThread())
 652      {
 653         CHECKPOINT;
 654         return(STATUS_OBJECT_TYPE_MISMATCH);
 655      }
 656
 657    KeAcquireSpinLock(&PsGetCurrentProcess()->HandleTable.ListLock,
 658                      &oldIrql);
 659    HandleRep = ObpGetObjectByHandle(&PsGetCurrentProcess()->HandleTable,
 660                                     Handle);
 661    if (HandleRep == NULL || HandleRep->ObjectBody == NULL)
 662      {
 663         KeReleaseSpinLock(&PsGetCurrentProcess()->HandleTable.ListLock,
 664                           oldIrql);
 665         return(STATUS_INVALID_HANDLE);
 666      }
 667    ObjectBody = HandleRep->ObjectBody;
 668    DPRINT("ObjectBody %p\n",ObjectBody);
 669    ObjectHeader = BODY_TO_HEADER(ObjectBody);
 670    DPRINT("ObjectHeader->RefCount %lu\n",ObjectHeader->RefCount);
 671    ObReferenceObjectByPointer(ObjectBody,
 672                               0,
 673                               NULL,
 674                               UserMode);
 675    GrantedAccess = HandleRep->GrantedAccess;
 676    KeReleaseSpinLock(&PsGetCurrentProcess()->HandleTable.ListLock,
 677                      oldIrql);
 678
 679    ObjectHeader = BODY_TO_HEADER(ObjectBody);
 680    DPRINT("ObjectHeader->RefCount %lu\n",ObjectHeader->RefCount);
 681
 682    if (ObjectType != NULL && ObjectType != ObjectHeader->ObjectType)
 683      {
 684         CHECKPOINT;
 685         return(STATUS_OBJECT_TYPE_MISMATCH);
 686      }
 687
 688    if (ObjectHeader->ObjectType == PsProcessType)
 689      {
 690         DPRINT("Reference from %x\n", ((PULONG)&Handle)[-1]);
 691      }
 692
 693    if (AccessMode == UserMode)
 694      {
 695         RtlMapGenericMask(&DesiredAccess, ObjectHeader->ObjectType->Mapping);
 696
 697         if (!(GrantedAccess & DesiredAccess) &&
 698             !((~GrantedAccess) & DesiredAccess))
 699           {
 700              CHECKPOINT;
 701              return(STATUS_ACCESS_DENIED);
 702           }
 703      }
 704
 705    *Object = ObjectBody;
 706
 707    CHECKPOINT;
 708    return(STATUS_SUCCESS);
 709 }
 710
 711 /**********************************************************************
 712  * NAME                                                 EXPORTED
 713  *      NtClose
 714  *
 715  * DESCRIPTION
 716  *      Closes a handle reference to an object.
 717  *
 718  * ARGUMENTS
 719  *      Handle
 720  *              Handle to close.
 721  *
 722  * RETURN VALUE
 723  *      Status.
 724  */
 725 NTSTATUS STDCALL NtClose(HANDLE Handle)
 726 {
 727    PVOID                ObjectBody;
 728    POBJECT_HEADER       Header;
 729
 730    assert_irql(PASSIVE_LEVEL);
 731
 732    DPRINT("NtClose(Handle %x)\n",Handle);
 733
 734    ObjectBody = ObDeleteHandle(PsGetCurrentProcess(), Handle);
 735    if (ObjectBody == NULL)
 736      {
 737         return(STATUS_INVALID_HANDLE);
 738      }
 739
 740    Header = BODY_TO_HEADER(ObjectBody);
 741
 742    DPRINT("Dereferencing %x\n", ObjectBody);
 743    ObDereferenceObject(ObjectBody);
 744
 745    return(STATUS_SUCCESS);
 746 }
 747
 748 #ifndef LIBCAPTIVE
 749
 750 NTSTATUS STDCALL
 751 ObInsertObject(PVOID Object,
 752                PACCESS_STATE PassedAccessState,
 753                ACCESS_MASK DesiredAccess,
 754                ULONG AdditionalReferences,
 755                PVOID* ReferencedObject,
 756                PHANDLE Handle)
 757 {
 758   return(ObCreateHandle(PsGetCurrentProcess(),
 759                         Object,
 760                         DesiredAccess,
 761                         FALSE,
 762                         Handle));
 763 }
 764
 765 #endif /* LIBCAPTIVE */
 766
 767 /* EOF */