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
 284    DPRINT("ObCloseAllHandles(Process %x)\n", Process);
 285
 286    HandleTable = &Process->HandleTable;
 287
 288    KeAcquireSpinLock(&HandleTable->ListLock, &oldIrql);
 289
 290    current_entry = HandleTable->ListHead.Flink;
 291
 292    while (current_entry != &HandleTable->ListHead)
 293      {
 294         current = CONTAINING_RECORD(current_entry, HANDLE_BLOCK, entry);
 295
 296         for (i = 0; i < HANDLE_BLOCK_ENTRIES; i++)
 297           {
 298              ObjectBody = current->handles[i].ObjectBody;
 299
 300              if (ObjectBody != NULL)
 301                {
 302                   POBJECT_HEADER Header = BODY_TO_HEADER(ObjectBody);
 303
 304                   if (Header->ObjectType == PsProcessType ||
 305                       Header->ObjectType == PsThreadType)
 306                     {
 307                        DPRINT("Deleting handle to %x\n", ObjectBody);
 308                     }
 309
 310                   ObReferenceObjectByPointer(ObjectBody,
 311                                              0,
 312                                              NULL,
 313                                              UserMode);
 314                   InterlockedDecrement(&Header->HandleCount);
 315                   current->handles[i].ObjectBody = NULL;
 316
 317                   KeReleaseSpinLock(&HandleTable->ListLock, oldIrql);
 318                   KeDetachProcess();
 319
 320                   if ((Header->ObjectType != NULL) &&
 321                       (Header->ObjectType->Close != NULL))
 322                     {
 323                        Header->ObjectType->Close(ObjectBody,
 324                                                  Header->HandleCount);
 325                     }
 326
 327                   ObDereferenceObject(ObjectBody);
 328                   KeAttachProcess(Process);
 329                   KeAcquireSpinLock(&HandleTable->ListLock, &oldIrql);
 330                   current_entry = &HandleTable->ListHead;
 331                   break;
 332                }
 333           }
 334
 335         current_entry = current_entry->Flink;
 336      }
 337    KeReleaseSpinLock(&HandleTable->ListLock, oldIrql);
 338    DPRINT("ObCloseAllHandles() finished\n");
 339    DPRINT("Type %x\n", BODY_TO_HEADER(Process)->ObjectType);
 340 }
 341
 342 VOID ObDeleteHandleTable(PEPROCESS Process)
 343 /*
 344  * FUNCTION: Deletes the handle table associated with a process
 345  */
 346 {
 347    PLIST_ENTRY current = NULL;
 348    PHANDLE_TABLE HandleTable = NULL;
 349
 350    ObCloseAllHandles(Process);
 351
 352    HandleTable = &Process->HandleTable;
 353    current = RemoveHeadList(&HandleTable->ListHead);
 354
 355    while (current != &HandleTable->ListHead)
 356      {
 357         HANDLE_BLOCK* HandleBlock = CONTAINING_RECORD(current,
 358                                                       HANDLE_BLOCK,
 359                                                       entry);
 360         DPRINT("Freeing %x\n", HandleBlock);
 361         ExFreePool(HandleBlock);
 362
 363         current = RemoveHeadList(&HandleTable->ListHead);
 364      }
 365 }
 366
 367 #endif /* LIBCAPTIVE */
 368
 369 VOID ObCreateHandleTable(PEPROCESS Parent,
 370                          BOOLEAN Inherit,
 371                          PEPROCESS Process)
 372 /*
 373  * FUNCTION: Creates a handle table for a process
 374  * ARGUMENTS:
 375  *       Parent = Parent process (or NULL if this is the first process)
 376  *       Inherit = True if the process should inherit its parent's handles
 377  *       Process = Process whose handle table is to be created
 378  */
 379 {
 380    PHANDLE_TABLE ParentHandleTable, HandleTable;
 381    KIRQL oldIrql;
 382    PLIST_ENTRY parent_current;
 383    ULONG i;
 384    PHANDLE_BLOCK current_block, new_block;
 385
 386    DPRINT("ObCreateHandleTable(Parent %x, Inherit %d, Process %x)\n",
 387           Parent,Inherit,Process);
 388
 389    InitializeListHead(&(Process->HandleTable.ListHead));
 390    KeInitializeSpinLock(&(Process->HandleTable.ListLock));
 391
 392    if (Parent != NULL)
 393      {
 394         ParentHandleTable = &Parent->HandleTable;
 395         HandleTable = &Process->HandleTable;
 396
 397         KeAcquireSpinLock(&Parent->HandleTable.ListLock, &oldIrql);
 398         KeAcquireSpinLockAtDpcLevel(&Process->HandleTable.ListLock);
 399
 400         parent_current = ParentHandleTable->ListHead.Flink;
 401
 402         while (parent_current != &ParentHandleTable->ListHead)
 403           {
 404              current_block = CONTAINING_RECORD(parent_current,
 405                                                HANDLE_BLOCK,
 406                                                entry);
 407              new_block = ExAllocatePoolWithTag(NonPagedPool,
 408                                                sizeof(HANDLE_BLOCK),
 409                                                TAG_HANDLE_TABLE);
 410              if (new_block == NULL)
 411              {
 412                 break;
 413              }
 414              RtlZeroMemory(new_block, sizeof(HANDLE_BLOCK));
 415
 416              for (i=0; i<HANDLE_BLOCK_ENTRIES; i++)
 417              {
 418                 if (current_block->handles[i].ObjectBody)
 419                 {
 420                    if (current_block->handles[i].Inherit && Inherit)
 421                    {
 422                       new_block->handles[i].ObjectBody =
 423                         current_block->handles[i].ObjectBody;
 424                       new_block->handles[i].GrantedAccess =
 425                         current_block->handles[i].GrantedAccess;
 426                       new_block->handles[i].Inherit = TRUE;
 427                       InterlockedIncrement(&(BODY_TO_HEADER(current_block->handles[i].ObjectBody)->HandleCount));
 428                    }
 429                 }
 430              }
 431              InsertTailList(&Process->HandleTable.ListHead, &new_block->entry);
 432              parent_current = parent_current->Flink;
 433           }
 434         KeReleaseSpinLockFromDpcLevel(&Process->HandleTable.ListLock);
 435         KeReleaseSpinLock(&Parent->HandleTable.ListLock, oldIrql);
 436      }
 437 }
 438
 439
 440 PVOID ObDeleteHandle(PEPROCESS Process, HANDLE Handle)
 441 {
 442    PHANDLE_REP Rep;
 443    PVOID ObjectBody;
 444    KIRQL oldIrql;
 445    PHANDLE_TABLE HandleTable;
 446    POBJECT_HEADER Header;
 447
 448    DPRINT("ObDeleteHandle(Handle %x)\n",Handle);
 449
 450    HandleTable = &Process->HandleTable;
 451
 452    KeAcquireSpinLock(&HandleTable->ListLock, &oldIrql);
 453
 454    Rep = ObpGetObjectByHandle(HandleTable, Handle);
 455    if (Rep == NULL)
 456      {
 457         KeReleaseSpinLock(&HandleTable->ListLock, oldIrql);
 458         return(NULL);
 459      }
 460
 461    ObjectBody = Rep->ObjectBody;
 462    DPRINT("ObjectBody %x\n", ObjectBody);
 463    if (ObjectBody != NULL)
 464      {
 465         Header = BODY_TO_HEADER(ObjectBody);
 466         InterlockedDecrement(&(BODY_TO_HEADER(ObjectBody)->HandleCount));
 467         ObReferenceObjectByPointer(ObjectBody,
 468                                    0,
 469                                    NULL,
 470                                    UserMode);
 471         Rep->ObjectBody = NULL;
 472
 473         KeReleaseSpinLock(&HandleTable->ListLock, oldIrql);
 474
 475         if ((Header->ObjectType != NULL) &&
 476             (Header->ObjectType->Close != NULL))
 477           {
 478              Header->ObjectType->Close(ObjectBody, Header->HandleCount);
 479           }
 480      }
 481    else
 482      {
 483         KeReleaseSpinLock(&HandleTable->ListLock, oldIrql);
 484      }
 485
 486    DPRINT("Finished ObDeleteHandle()\n");
 487    return(ObjectBody);
 488 }
 489
 490
 491 NTSTATUS ObCreateHandle(PEPROCESS Process,
 492                         PVOID ObjectBody,
 493                         ACCESS_MASK GrantedAccess,
 494                         BOOLEAN Inherit,
 495                         PHANDLE HandleReturn)
 496 /*
 497  * FUNCTION: Add a handle referencing an object
 498  * ARGUMENTS:
 499  *         obj = Object body that the handle should refer to
 500  * RETURNS: The created handle
 501  * NOTE: The handle is valid only in the context of the current process
 502  */
 503 {
 504    LIST_ENTRY* current;
 505    unsigned int handle=1;
 506    unsigned int i;
 507    HANDLE_BLOCK* new_blk = NULL;
 508    PHANDLE_TABLE HandleTable;
 509    KIRQL oldlvl;
 510
 511    DPRINT("ObCreateHandle(Process %x, obj %x)\n",Process,ObjectBody);
 512
 513    assert(Process);
 514
 515    if (ObjectBody != NULL)
 516      {
 517         InterlockedIncrement(&(BODY_TO_HEADER(ObjectBody)->HandleCount));
 518      }
 519    HandleTable = &Process->HandleTable;
 520    KeAcquireSpinLock(&HandleTable->ListLock, &oldlvl);
 521    current = HandleTable->ListHead.Flink;
 522    /*
 523     * Scan through the currently allocated handle blocks looking for a free
 524     * slot
 525     */
 526    while (current != (&HandleTable->ListHead))
 527      {
 528         HANDLE_BLOCK* blk = CONTAINING_RECORD(current,HANDLE_BLOCK,entry);
 529
 530         DPRINT("Current %x\n",current);
 531
 532         for (i=0;i<HANDLE_BLOCK_ENTRIES;i++)
 533           {
 534              DPRINT("Considering slot %d containing %x\n",i,blk->handles[i]);
 535              if (blk->handles[i].ObjectBody==NULL)
 536                {
 537                   blk->handles[i].ObjectBody = ObjectBody;
 538                   blk->handles[i].GrantedAccess = GrantedAccess;
 539                   blk->handles[i].Inherit = Inherit;
 540                   KeReleaseSpinLock(&HandleTable->ListLock, oldlvl);
 541                   *HandleReturn = (HANDLE)((handle + i) << 2);
 542                   return(STATUS_SUCCESS);
 543                }
 544           }
 545
 546         handle = handle + HANDLE_BLOCK_ENTRIES;
 547         current = current->Flink;
 548      }
 549
 550    /*
 551     * Add a new handle block to the end of the list
 552     */
 553    new_blk =
 554      (HANDLE_BLOCK *)ExAllocatePoolWithTag(NonPagedPool,sizeof(HANDLE_BLOCK),
 555                                            TAG_HANDLE_TABLE);
 556    if (!new_blk)
 557     {
 558       *HandleReturn = (PHANDLE)NULL;
 559       return(STATUS_INSUFFICIENT_RESOURCES);
 560     }
 561    RtlZeroMemory(new_blk,sizeof(HANDLE_BLOCK));
 562    InsertTailList(&(Process->HandleTable.ListHead),
 563                   &new_blk->entry);
 564    new_blk->handles[0].ObjectBody = ObjectBody;
 565    new_blk->handles[0].GrantedAccess = GrantedAccess;
 566    new_blk->handles[0].Inherit = Inherit;
 567    KeReleaseSpinLock(&HandleTable->ListLock, oldlvl);
 568    *HandleReturn = (HANDLE)(handle << 2);
 569    return(STATUS_SUCCESS);
 570 }
 571
 572
 573 NTSTATUS STDCALL
 574 ObReferenceObjectByHandle(HANDLE Handle,
 575                           ACCESS_MASK DesiredAccess,
 576                           POBJECT_TYPE ObjectType,
 577                           KPROCESSOR_MODE AccessMode,
 578                           PVOID* Object,
 579                           POBJECT_HANDLE_INFORMATION HandleInformationPtr)
 580 /*
 581  * FUNCTION: Increments the reference count for an object and returns a
 582  * pointer to its body
 583  * ARGUMENTS:
 584  *         Handle = Handle for the object
 585  *         DesiredAccess = Desired access to the object
 586  *         ObjectType
 587  *         AccessMode
 588  *         Object (OUT) = Points to the object body on return
 589  *         HandleInformation (OUT) = Contains information about the handle
 590  *                                   on return
 591  * RETURNS: Status
 592  */
 593 {
 594    PHANDLE_REP HandleRep;
 595    POBJECT_HEADER ObjectHeader;
 596    KIRQL oldIrql;
 597    PVOID ObjectBody;
 598    ACCESS_MASK GrantedAccess;
 599
 600    ASSERT_IRQL(PASSIVE_LEVEL);
 601
 602    DPRINT("ObReferenceObjectByHandle(Handle %x, DesiredAccess %x, "
 603            "ObjectType %x, AccessMode %d, Object %x)\n",Handle,DesiredAccess,
 604            ObjectType,AccessMode,Object);
 605
 606
 607    /*
 608     * Handle special handle names
 609     */
 610    if (Handle == NtCurrentProcess() &&
 611        (ObjectType == PsProcessType || ObjectType == NULL))
 612      {
 613         DPRINT("Reference from %x\n", ((PULONG)&Handle)[-1]);
 614
 615         ObReferenceObjectByPointer(PsGetCurrentProcess(),
 616                                    PROCESS_ALL_ACCESS,
 617                                    PsProcessType,
 618                                    UserMode);
 619         *Object = PsGetCurrentProcess();
 620         DPRINT("Referencing current process %x\n", PsGetCurrentProcess());
 621         return(STATUS_SUCCESS);
 622      }
 623    else if (Handle == NtCurrentProcess())
 624      {
 625         CHECKPOINT;
 626         return(STATUS_OBJECT_TYPE_MISMATCH);
 627      }
 628    if (Handle == NtCurrentThread() &&
 629        (ObjectType == PsThreadType || ObjectType == NULL))
 630      {
 631         ObReferenceObjectByPointer(PsGetCurrentThread(),
 632                                    THREAD_ALL_ACCESS,
 633                                    PsThreadType,
 634                                    UserMode);
 635         *Object = PsGetCurrentThread();
 636         CHECKPOINT;
 637         return(STATUS_SUCCESS);
 638      }
 639    else if (Handle == NtCurrentThread())
 640      {
 641         CHECKPOINT;
 642         return(STATUS_OBJECT_TYPE_MISMATCH);
 643      }
 644
 645    KeAcquireSpinLock(&PsGetCurrentProcess()->HandleTable.ListLock,
 646                      &oldIrql);
 647    HandleRep = ObpGetObjectByHandle(&PsGetCurrentProcess()->HandleTable,
 648                                     Handle);
 649    if (HandleRep == NULL || HandleRep->ObjectBody == NULL)
 650      {
 651         KeReleaseSpinLock(&PsGetCurrentProcess()->HandleTable.ListLock,
 652                           oldIrql);
 653         return(STATUS_INVALID_HANDLE);
 654      }
 655    ObjectBody = HandleRep->ObjectBody;
 656    DPRINT("ObjectBody %p\n",ObjectBody);
 657    ObjectHeader = BODY_TO_HEADER(ObjectBody);
 658    DPRINT("ObjectHeader->RefCount %lu\n",ObjectHeader->RefCount);
 659    ObReferenceObjectByPointer(ObjectBody,
 660                               0,
 661                               NULL,
 662                               UserMode);
 663    GrantedAccess = HandleRep->GrantedAccess;
 664    KeReleaseSpinLock(&PsGetCurrentProcess()->HandleTable.ListLock,
 665                      oldIrql);
 666
 667    ObjectHeader = BODY_TO_HEADER(ObjectBody);
 668    DPRINT("ObjectHeader->RefCount %lu\n",ObjectHeader->RefCount);
 669
 670    if (ObjectType != NULL && ObjectType != ObjectHeader->ObjectType)
 671      {
 672         CHECKPOINT;
 673         return(STATUS_OBJECT_TYPE_MISMATCH);
 674      }
 675
 676    if (ObjectHeader->ObjectType == PsProcessType)
 677      {
 678         DPRINT("Reference from %x\n", ((PULONG)&Handle)[-1]);
 679      }
 680
 681    if (AccessMode == UserMode)
 682      {
 683         RtlMapGenericMask(&DesiredAccess, ObjectHeader->ObjectType->Mapping);
 684
 685         if (!(GrantedAccess & DesiredAccess) &&
 686             !((~GrantedAccess) & DesiredAccess))
 687           {
 688              CHECKPOINT;
 689              return(STATUS_ACCESS_DENIED);
 690           }
 691      }
 692
 693    *Object = ObjectBody;
 694
 695    CHECKPOINT;
 696    return(STATUS_SUCCESS);
 697 }
 698
 699 /**********************************************************************
 700  * NAME                                                 EXPORTED
 701  *      NtClose
 702  *
 703  * DESCRIPTION
 704  *      Closes a handle reference to an object.
 705  *
 706  * ARGUMENTS
 707  *      Handle
 708  *              Handle to close.
 709  *
 710  * RETURN VALUE
 711  *      Status.
 712  */
 713 NTSTATUS STDCALL NtClose(HANDLE Handle)
 714 {
 715    PVOID                ObjectBody;
 716    POBJECT_HEADER       Header;
 717
 718    assert_irql(PASSIVE_LEVEL);
 719
 720    DPRINT("NtClose(Handle %x)\n",Handle);
 721
 722    ObjectBody = ObDeleteHandle(PsGetCurrentProcess(), Handle);
 723    if (ObjectBody == NULL)
 724      {
 725         return(STATUS_INVALID_HANDLE);
 726      }
 727
 728    Header = BODY_TO_HEADER(ObjectBody);
 729
 730    DPRINT("Dereferencing %x\n", ObjectBody);
 731    ObDereferenceObject(ObjectBody);
 732
 733    return(STATUS_SUCCESS);
 734 }
 735
 736 #ifndef LIBCAPTIVE
 737
 738 NTSTATUS STDCALL
 739 ObInsertObject(PVOID Object,
 740                PACCESS_STATE PassedAccessState,
 741                ACCESS_MASK DesiredAccess,
 742                ULONG AdditionalReferences,
 743                PVOID* ReferencedObject,
 744                PHANDLE Handle)
 745 {
 746   return(ObCreateHandle(PsGetCurrentProcess(),
 747                         Object,
 748                         DesiredAccess,
 749                         FALSE,
 750                         Handle));
 751 }
 752
 753 #endif /* LIBCAPTIVE */
 754
 755 /* EOF */