ntoskrnl/ldr/loader.c

   1 /* $Id$
   2  *
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PROJECT:         ReactOS kernel
   5  * FILE:            ntoskrnl/ldr/loader.c
   6  * PURPOSE:         Loaders for PE executables
   7  * PROGRAMMERS:     Jean Michault
   8  *                  Rex Jolliff (rex@lvcablemodem.com)
   9  *                  Jason Filby (jasonfilby@yahoo.com)
  10  *                  Casper S. Hornstrup (chorns@users.sourceforge.net)
  11  * UPDATE HISTORY:
  12  *   DW   22/05/98   Created
  13  *   RJJ  10/12/98   Completed image loader function and added hooks for MZ/PE
  14  *   RJJ  10/12/98   Built driver loader function and added hooks for PE/COFF
  15  *   RJJ  10/12/98   Rolled in David's code to load COFF drivers
  16  *   JM   14/12/98   Built initial PE user module loader
  17  *   RJJ  06/03/99   Moved user PE loader into NTDLL
  18  *   JF   26/01/2000 Recoded some parts to retrieve export details correctly
  19  *   DW   27/06/2000 Removed redundant header files
  20  *   CSH  11/04/2001 Added automatic loading of module symbols if they exist
  21  *   KJK  02/04/2003 Nebbet-ized a couple of type names
  22  */
  23
  24
  25 /* INCLUDES *****************************************************************/
  26
  27 #include <limits.h>
  28 #include <ddk/ntddk.h>
  29 #include <roscfg.h>
  30 #include <internal/module.h>
  31 #include <internal/ntoskrnl.h>
  32 #include <internal/kd.h>
  33 #include <internal/io.h>
  34 #include <internal/mm.h>
  35 #include <internal/ps.h>
  36 #include <internal/ldr.h>
  37 #include <internal/pool.h>
  38 #include <internal/kd.h>
  39 #include <ntos/minmax.h>
  40
  41 #ifdef HALDBG
  42 #include <internal/ntosdbg.h>
  43 #else
  44 #define ps(args...)
  45 #endif
  46
  47 #define NDEBUG
  48 #include <internal/debug.h>
  49
  50 /* GLOBALS *******************************************************************/
  51
  52 LIST_ENTRY ModuleListHead;
  53 KSPIN_LOCK ModuleListLock;
  54
  55 LIST_ENTRY ModuleTextListHead;
  56 STATIC MODULE_TEXT_SECTION NtoskrnlTextSection;
  57 STATIC MODULE_TEXT_SECTION LdrHalTextSection;
  58 ULONG_PTR LdrHalBase;
  59
  60 #define TAG_DRIVER_MEM  TAG('D', 'R', 'V', 'M')
  61
  62 /* FORWARD DECLARATIONS ******************************************************/
  63
  64 NTSTATUS
  65 LdrProcessModule(PVOID ModuleLoadBase,
  66                  PUNICODE_STRING ModuleName,
  67                  PMODULE_OBJECT *ModuleObject);
  68
  69 PVOID
  70 LdrGetExportAddress(PMODULE_OBJECT ModuleObject,
  71                     char *Name,
  72                     unsigned short Hint);
  73
  74 static VOID
  75 LdrpBuildModuleBaseName(PUNICODE_STRING BaseName,
  76                         PUNICODE_STRING FullName);
  77
  78 static LONG
  79 LdrpCompareModuleNames(IN PUNICODE_STRING String1,
  80                        IN PUNICODE_STRING String2);
  81
  82
  83 /*  PE Driver load support  */
  84 static NTSTATUS LdrPEProcessModule(PVOID ModuleLoadBase,
  85                                    PUNICODE_STRING FileName,
  86                                    PMODULE_OBJECT *ModuleObject);
  87 static PVOID
  88 LdrPEGetExportAddress(PMODULE_OBJECT ModuleObject,
  89                       PCHAR Name,
  90                       USHORT Hint);
  91
  92 static PVOID
  93 LdrSafePEGetExportAddress(PVOID ImportModuleBase,
  94                           PCHAR Name,
  95                           USHORT Hint);
  96
  97 static PVOID
  98 LdrPEFixupForward(PCHAR ForwardName);
  99
 100
 101 /* FUNCTIONS *****************************************************************/
 102
 103 VOID
 104 LdrInitDebug(PLOADER_MODULE Module, PWCH Name)
 105 {
 106   PLIST_ENTRY current_entry;
 107   MODULE_TEXT_SECTION* current;
 108
 109   current_entry = ModuleTextListHead.Flink;
 110   while (current_entry != &ModuleTextListHead)
 111     {
 112       current =
 113         CONTAINING_RECORD(current_entry, MODULE_TEXT_SECTION, ListEntry);
 114       if (wcscmp(current->Name, Name) == 0)
 115         {
 116           break;
 117         }
 118       current_entry = current_entry->Flink;
 119     }
 120
 121   if (current_entry == &ModuleTextListHead)
 122     {
 123       return;
 124     }
 125 }
 126
 127 VOID
 128 LdrInit1(VOID)
 129 {
 130   PIMAGE_DOS_HEADER DosHeader;
 131   PIMAGE_FILE_HEADER FileHeader;
 132   PIMAGE_OPTIONAL_HEADER OptionalHeader;
 133   PIMAGE_SECTION_HEADER SectionList;
 134
 135   InitializeListHead(&ModuleTextListHead);
 136
 137   /* Setup ntoskrnl.exe text section */
 138   DosHeader = (PIMAGE_DOS_HEADER) KERNEL_BASE;
 139   FileHeader =
 140     (PIMAGE_FILE_HEADER) ((DWORD)KERNEL_BASE +
 141                           DosHeader->e_lfanew + sizeof(ULONG));
 142   OptionalHeader = (PIMAGE_OPTIONAL_HEADER)
 143     ((DWORD)FileHeader + sizeof(IMAGE_FILE_HEADER));
 144   SectionList = (PIMAGE_SECTION_HEADER)
 145     ((DWORD)OptionalHeader + sizeof(IMAGE_OPTIONAL_HEADER));
 146   NtoskrnlTextSection.Base = KERNEL_BASE;
 147   NtoskrnlTextSection.Length = SectionList[0].Misc.VirtualSize +
 148     SectionList[0].VirtualAddress;
 149   NtoskrnlTextSection.Name = KERNEL_MODULE_NAME;
 150   NtoskrnlTextSection.OptionalHeader = OptionalHeader;
 151   InsertTailList(&ModuleTextListHead, &NtoskrnlTextSection.ListEntry);
 152
 153   /* Setup hal.dll text section */
 154   DosHeader = (PIMAGE_DOS_HEADER)LdrHalBase;
 155   FileHeader =
 156     (PIMAGE_FILE_HEADER) ((DWORD)LdrHalBase +
 157                           DosHeader->e_lfanew + sizeof(ULONG));
 158   OptionalHeader = (PIMAGE_OPTIONAL_HEADER)
 159     ((DWORD)FileHeader + sizeof(IMAGE_FILE_HEADER));
 160   SectionList = (PIMAGE_SECTION_HEADER)
 161     ((DWORD)OptionalHeader + sizeof(IMAGE_OPTIONAL_HEADER));
 162   LdrHalTextSection.Base = LdrHalBase;
 163   LdrHalTextSection.Length = SectionList[0].Misc.VirtualSize +
 164     SectionList[0].VirtualAddress;
 165   LdrHalTextSection.Name = HAL_MODULE_NAME;
 166   LdrHalTextSection.OptionalHeader = OptionalHeader;
 167   InsertTailList(&ModuleTextListHead, &LdrHalTextSection.ListEntry);
 168
 169   /* Hook for KDB on initialization of the loader. */
 170   KDB_LOADERINIT_HOOK(&NtoskrnlTextSection, &LdrHalTextSection);
 171 }
 172
 173
 174 VOID
 175 LdrInitModuleManagement(VOID)
 176 {
 177   PIMAGE_DOS_HEADER DosHeader;
 178   PMODULE_OBJECT ModuleObject;
 179
 180   /* Initialize the module list and spinlock */
 181   InitializeListHead(&ModuleListHead);
 182   KeInitializeSpinLock(&ModuleListLock);
 183
 184   /* Create module object for NTOSKRNL */
 185   ModuleObject = ExAllocatePool(NonPagedPool, sizeof(MODULE_OBJECT));
 186   assert(ModuleObject != NULL);
 187   RtlZeroMemory(ModuleObject, sizeof(MODULE_OBJECT));
 188
 189   /* Initialize ModuleObject data */
 190   ModuleObject->Base = (PVOID) KERNEL_BASE;
 191   ModuleObject->Flags = MODULE_FLAG_PE;
 192   RtlCreateUnicodeString(&ModuleObject->FullName,
 193                          KERNEL_MODULE_NAME);
 194   LdrpBuildModuleBaseName(&ModuleObject->BaseName,
 195                           &ModuleObject->FullName);
 196
 197   DosHeader = (PIMAGE_DOS_HEADER) KERNEL_BASE;
 198   ModuleObject->Image.PE.FileHeader =
 199     (PIMAGE_FILE_HEADER) ((DWORD) ModuleObject->Base +
 200     DosHeader->e_lfanew + sizeof(ULONG));
 201   ModuleObject->Image.PE.OptionalHeader = (PIMAGE_OPTIONAL_HEADER)
 202     ((DWORD)ModuleObject->Image.PE.FileHeader + sizeof(IMAGE_FILE_HEADER));
 203   ModuleObject->Image.PE.SectionList = (PIMAGE_SECTION_HEADER)
 204     ((DWORD)ModuleObject->Image.PE.OptionalHeader + sizeof(IMAGE_OPTIONAL_HEADER));
 205   ModuleObject->EntryPoint = (PVOID) ((DWORD) ModuleObject->Base +
 206     ModuleObject->Image.PE.OptionalHeader->AddressOfEntryPoint);
 207   DPRINT("ModuleObject:%08x  entrypoint at %x\n", ModuleObject, ModuleObject->EntryPoint);
 208   ModuleObject->Length = ModuleObject->Image.PE.OptionalHeader->SizeOfImage;
 209   ModuleObject->TextSection = &NtoskrnlTextSection;
 210
 211   InsertTailList(&ModuleListHead,
 212                  &ModuleObject->ListEntry);
 213
 214   /* Create module object for HAL */
 215   ModuleObject = ExAllocatePool(NonPagedPool, sizeof(MODULE_OBJECT));
 216   assert(ModuleObject != NULL);
 217   RtlZeroMemory(ModuleObject, sizeof(MODULE_OBJECT));
 218
 219   /* Initialize ModuleObject data */
 220   ModuleObject->Base = (PVOID) LdrHalBase;
 221   ModuleObject->Flags = MODULE_FLAG_PE;
 222
 223   RtlCreateUnicodeString(&ModuleObject->FullName,
 224                          HAL_MODULE_NAME);
 225   LdrpBuildModuleBaseName(&ModuleObject->BaseName,
 226                           &ModuleObject->FullName);
 227
 228   DosHeader = (PIMAGE_DOS_HEADER) LdrHalBase;
 229   ModuleObject->Image.PE.FileHeader =
 230     (PIMAGE_FILE_HEADER) ((DWORD) ModuleObject->Base +
 231     DosHeader->e_lfanew + sizeof(ULONG));
 232   ModuleObject->Image.PE.OptionalHeader = (PIMAGE_OPTIONAL_HEADER)
 233     ((DWORD)ModuleObject->Image.PE.FileHeader + sizeof(IMAGE_FILE_HEADER));
 234   ModuleObject->Image.PE.SectionList = (PIMAGE_SECTION_HEADER)
 235     ((DWORD)ModuleObject->Image.PE.OptionalHeader + sizeof(IMAGE_OPTIONAL_HEADER));
 236   ModuleObject->EntryPoint = (PVOID) ((DWORD) ModuleObject->Base +
 237     ModuleObject->Image.PE.OptionalHeader->AddressOfEntryPoint);
 238   DPRINT("ModuleObject:%08x  entrypoint at %x\n", ModuleObject, ModuleObject->EntryPoint);
 239   ModuleObject->Length = ModuleObject->Image.PE.OptionalHeader->SizeOfImage;
 240   ModuleObject->TextSection = &LdrHalTextSection;
 241
 242   InsertTailList(&ModuleListHead,
 243                  &ModuleObject->ListEntry);
 244 }
 245
 246 NTSTATUS
 247 LdrpLoadImage(PUNICODE_STRING DriverName,
 248               PVOID *ModuleBase,
 249               PVOID *SectionPointer,
 250               PVOID *EntryPoint,
 251               PVOID *ExportSectionPointer)
 252 {
 253   PMODULE_OBJECT ModuleObject;
 254   NTSTATUS Status;
 255
 256   ModuleObject = LdrGetModuleObject(DriverName);
 257   if (ModuleObject == NULL)
 258     {
 259       Status = LdrLoadModule(DriverName, &ModuleObject);
 260       if (!NT_SUCCESS(Status))
 261         {
 262           return(Status);
 263         }
 264     }
 265
 266   if (ModuleBase)
 267     *ModuleBase = ModuleObject->Base;
 268
 269 //  if (SectionPointer)
 270 //    *SectionPointer = ModuleObject->
 271
 272   if (EntryPoint)
 273     *EntryPoint = ModuleObject->EntryPoint;
 274
 275 //  if (ExportSectionPointer)
 276 //    *ExportSectionPointer = ModuleObject->
 277
 278   return(STATUS_SUCCESS);
 279 }
 280
 281
 282 NTSTATUS
 283 LdrpUnloadImage(PVOID ModuleBase)
 284 {
 285   return(STATUS_NOT_IMPLEMENTED);
 286 }
 287
 288
 289 NTSTATUS
 290 LdrpLoadAndCallImage(PUNICODE_STRING ModuleName)
 291 {
 292   PDRIVER_INITIALIZE DriverEntry;
 293   PMODULE_OBJECT ModuleObject;
 294   NTSTATUS Status;
 295
 296   ModuleObject = LdrGetModuleObject(ModuleName);
 297   if (ModuleObject != NULL)
 298     {
 299       return(STATUS_IMAGE_ALREADY_LOADED);
 300     }
 301
 302   Status = LdrLoadModule(ModuleName, &ModuleObject);
 303   if (!NT_SUCCESS(Status))
 304     {
 305       return(Status);
 306     }
 307
 308   DriverEntry = (PDRIVER_INITIALIZE)ModuleObject->EntryPoint;
 309
 310   Status = DriverEntry(NULL, NULL);
 311   if (!NT_SUCCESS(Status))
 312     {
 313       LdrUnloadModule(ModuleObject);
 314     }
 315
 316   return(Status);
 317 }
 318
 319
 320 NTSTATUS
 321 LdrLoadModule(PUNICODE_STRING Filename,
 322               PMODULE_OBJECT *ModuleObject)
 323 {
 324   PVOID ModuleLoadBase;
 325   NTSTATUS Status;
 326   HANDLE FileHandle;
 327   OBJECT_ATTRIBUTES ObjectAttributes;
 328   PMODULE_OBJECT Module;
 329   FILE_STANDARD_INFORMATION FileStdInfo;
 330   IO_STATUS_BLOCK IoStatusBlock;
 331
 332   *ModuleObject = NULL;
 333
 334   DPRINT("Loading Module %wZ...\n", Filename);
 335
 336   /*  Open the Module  */
 337   InitializeObjectAttributes(&ObjectAttributes,
 338                              Filename,
 339                              0,
 340                              NULL,
 341                              NULL);
 342   CHECKPOINT;
 343   Status = NtOpenFile(&FileHandle,
 344                       FILE_ALL_ACCESS,
 345                       &ObjectAttributes,
 346                       &IoStatusBlock,
 347                       0,
 348                       FILE_SYNCHRONOUS_IO_NONALERT);
 349   CHECKPOINT;
 350   if (!NT_SUCCESS(Status))
 351     {
 352       CPRINT("Could not open module file: %wZ\n", Filename);
 353       return(Status);
 354     }
 355   CHECKPOINT;
 356
 357   /*  Get the size of the file  */
 358   Status = NtQueryInformationFile(FileHandle,
 359                                   &IoStatusBlock,
 360                                   &FileStdInfo,
 361                                   sizeof(FileStdInfo),
 362                                   FileStandardInformation);
 363   if (!NT_SUCCESS(Status))
 364     {
 365       CPRINT("Could not get file size\n");
 366       NtClose(FileHandle);
 367       return(Status);
 368     }
 369   CHECKPOINT;
 370
 371   /*  Allocate nonpageable memory for driver  */
 372   ModuleLoadBase = ExAllocatePoolWithTag(NonPagedPool,
 373                                          FileStdInfo.EndOfFile.u.LowPart,
 374                                          TAG_DRIVER_MEM);
 375   if (ModuleLoadBase == NULL)
 376     {
 377       CPRINT("Could not allocate memory for module");
 378       NtClose(FileHandle);
 379       return(STATUS_INSUFFICIENT_RESOURCES);
 380     }
 381   CHECKPOINT;
 382
 383   /*  Load driver into memory chunk  */
 384   Status = NtReadFile(FileHandle,
 385                       0, 0, 0,
 386                       &IoStatusBlock,
 387                       ModuleLoadBase,
 388                       FileStdInfo.EndOfFile.u.LowPart,
 389                       0, 0);
 390   if (!NT_SUCCESS(Status))
 391     {
 392       CPRINT("Could not read module file into memory");
 393       ExFreePool(ModuleLoadBase);
 394       NtClose(FileHandle);
 395       return(Status);
 396     }
 397   CHECKPOINT;
 398
 399   NtClose(FileHandle);
 400
 401   Status = LdrProcessModule(ModuleLoadBase,
 402                             Filename,
 403                             &Module);
 404   if (!NT_SUCCESS(Status))
 405     {
 406       CPRINT("Could not process module");
 407       ExFreePool(ModuleLoadBase);
 408       return(Status);
 409     }
 410
 411   /*  Cleanup  */
 412   ExFreePool(ModuleLoadBase);
 413
 414   *ModuleObject = Module;
 415
 416   /* Hook for KDB on loading a driver. */
 417   KDB_LOADDRIVER_HOOK(Filename, Module);
 418
 419   return(STATUS_SUCCESS);
 420 }
 421
 422
 423 NTSTATUS
 424 LdrUnloadModule(PMODULE_OBJECT ModuleObject)
 425 {
 426   KIRQL Irql;
 427
 428   /* Remove the module from the module list */
 429   KeAcquireSpinLock(&ModuleListLock,&Irql);
 430   RemoveEntryList(&ModuleObject->ListEntry);
 431   KeReleaseSpinLock(&ModuleListLock, Irql);
 432
 433   /* Hook for KDB on unloading a driver. */
 434   KDB_UNLOADDRIVER_HOOK(ModuleObject);
 435
 436   /* Free text section */
 437   if (ModuleObject->TextSection != NULL)
 438     {
 439       ExFreePool(ModuleObject->TextSection->Name);
 440       RemoveEntryList(&ModuleObject->TextSection->ListEntry);
 441       ExFreePool(ModuleObject->TextSection);
 442       ModuleObject->TextSection = NULL;
 443     }
 444
 445   /* Free module section */
 446 //  MmFreeSection(ModuleObject->Base);
 447
 448   ExFreePool(ModuleObject);
 449
 450   return(STATUS_SUCCESS);
 451 }
 452
 453
 454 NTSTATUS
 455 LdrInitializeBootStartDriver(PVOID ModuleLoadBase,
 456                              PCHAR FileName,
 457                              ULONG ModuleLength)
 458 {
 459   PMODULE_OBJECT ModuleObject;
 460   UNICODE_STRING ModuleName;
 461   PDEVICE_NODE DeviceNode;
 462   NTSTATUS Status;
 463
 464   WCHAR Buffer[MAX_PATH];
 465   ULONG Length;
 466   LPWSTR Start;
 467   LPWSTR Ext;
 468   PCHAR FileExt;
 469   CHAR TextBuffer [256];
 470   ULONG x, y, cx, cy;
 471
 472   HalQueryDisplayParameters(&x, &y, &cx, &cy);
 473   RtlFillMemory(TextBuffer, x, ' ');
 474   TextBuffer[x] = '\0';
 475   HalSetDisplayParameters(0, y-1);
 476   HalDisplayString(TextBuffer);
 477
 478   sprintf(TextBuffer, "Initializing %s...\n", FileName);
 479   HalSetDisplayParameters(0, y-1);
 480   HalDisplayString(TextBuffer);
 481   HalSetDisplayParameters(cx, cy);
 482
 483   /*  Split the filename into base name and extension  */
 484   FileExt = strrchr(FileName, '.');
 485   if (FileExt != NULL)
 486     Length = FileExt - FileName;
 487   else
 488     Length = strlen(FileName);
 489
 490   if ((FileExt != NULL) && (strcmp(FileExt, ".sym") == 0))
 491     {
 492       KDB_SYMBOLFILE_HOOK(ModuleLoadBase, FileName, Length);
 493       return(STATUS_SUCCESS);
 494     }
 495   else if ((FileExt != NULL) && !(strcmp(FileExt, ".sys") == 0))
 496     {
 497       CPRINT("Ignoring non-driver file %s\n", FileName);
 498       return STATUS_SUCCESS;
 499     }
 500
 501   /* Use IopRootDeviceNode for now */
 502   Status = IopCreateDeviceNode(IopRootDeviceNode, NULL, &DeviceNode);
 503   if (!NT_SUCCESS(Status))
 504     {
 505       CPRINT("Driver load failed, status (%x)\n", Status);
 506       return(Status);
 507     }
 508
 509   RtlCreateUnicodeStringFromAsciiz(&ModuleName,
 510                                    FileName);
 511   Status = LdrProcessModule(ModuleLoadBase,
 512                             &ModuleName,
 513                             &ModuleObject);
 514   RtlFreeUnicodeString(&ModuleName);
 515   if (ModuleObject == NULL)
 516     {
 517       IopFreeDeviceNode(DeviceNode);
 518       CPRINT("Driver load failed, status (%x)\n", Status);
 519       return(STATUS_UNSUCCESSFUL);
 520     }
 521
 522
 523   /* Get the service name from the module name */
 524   Start = wcsrchr(ModuleObject->BaseName.Buffer, L'\\');
 525   if (Start == NULL)
 526     Start = ModuleObject->BaseName.Buffer;
 527   else
 528     Start++;
 529
 530   Ext = wcsrchr(ModuleObject->BaseName.Buffer, L'.');
 531   if (Ext != NULL)
 532     Length = Ext - Start;
 533   else
 534     Length = wcslen(Start);
 535
 536   wcsncpy(Buffer, Start, Length);
 537   Buffer[Length] = 0;
 538   RtlCreateUnicodeString(&DeviceNode->ServiceName, Buffer);
 539
 540   Status = IopInitializeDriver(ModuleObject->EntryPoint,
 541                                DeviceNode, FALSE);
 542   if (!NT_SUCCESS(Status))
 543     {
 544       IopFreeDeviceNode(DeviceNode);
 545       CPRINT("Driver load failed, status (%x)\n", Status);
 546     }
 547
 548   return(Status);
 549 }
 550
 551
 552 NTSTATUS
 553 LdrProcessModule(PVOID ModuleLoadBase,
 554                  PUNICODE_STRING ModuleName,
 555                  PMODULE_OBJECT *ModuleObject)
 556 {
 557   PIMAGE_DOS_HEADER PEDosHeader;
 558
 559   /*  If MZ header exists  */
 560   PEDosHeader = (PIMAGE_DOS_HEADER) ModuleLoadBase;
 561   if (PEDosHeader->e_magic == IMAGE_DOS_MAGIC && PEDosHeader->e_lfanew != 0L)
 562     {
 563       return LdrPEProcessModule(ModuleLoadBase,
 564                                 ModuleName,
 565                                 ModuleObject);
 566     }
 567
 568   CPRINT("Module wasn't PE\n");
 569   return STATUS_UNSUCCESSFUL;
 570 }
 571
 572
 573 PVOID
 574 LdrGetExportAddress(PMODULE_OBJECT ModuleObject,
 575                     char *Name,
 576                     unsigned short Hint)
 577 {
 578   if (ModuleObject->Flags & MODULE_FLAG_PE)
 579     {
 580       return LdrPEGetExportAddress(ModuleObject, Name, Hint);
 581     }
 582   else
 583     {
 584       return 0;
 585     }
 586 }
 587
 588
 589 NTSTATUS
 590 LdrpQueryModuleInformation(PVOID Buffer,
 591                            ULONG Size,
 592                            PULONG ReqSize)
 593 {
 594   PLIST_ENTRY current_entry;
 595   PMODULE_OBJECT current;
 596   ULONG ModuleCount = 0;
 597   PSYSTEM_MODULES Smi;
 598   ANSI_STRING AnsiName;
 599   PCHAR p;
 600   KIRQL Irql;
 601
 602   KeAcquireSpinLock(&ModuleListLock,&Irql);
 603
 604   /* calculate required size */
 605   current_entry = ModuleListHead.Flink;
 606   while (current_entry != (&ModuleListHead))
 607     {
 608       ModuleCount++;
 609       current_entry = current_entry->Flink;
 610     }
 611
 612   *ReqSize = sizeof(SYSTEM_MODULES)+
 613     (ModuleCount - 1) * sizeof(SYSTEM_MODULE_INFORMATION);
 614
 615   if (Size < *ReqSize)
 616     {
 617       KeReleaseSpinLock(&ModuleListLock, Irql);
 618       return(STATUS_INFO_LENGTH_MISMATCH);
 619     }
 620
 621   /* fill the buffer */
 622   memset(Buffer, '=', Size);
 623
 624   Smi = (PSYSTEM_MODULES)Buffer;
 625   Smi->Count = ModuleCount;
 626
 627   ModuleCount = 0;
 628   current_entry = ModuleListHead.Flink;
 629   while (current_entry != (&ModuleListHead))
 630     {
 631       current = CONTAINING_RECORD(current_entry,MODULE_OBJECT,ListEntry);
 632
 633       Smi->Modules[ModuleCount].Reserved[0] = 0;                /* Always 0 */
 634       Smi->Modules[ModuleCount].Reserved[1] = 0;                /* Always 0 */
 635       Smi->Modules[ModuleCount].Base = current->Base;
 636       Smi->Modules[ModuleCount].Size = current->Length;
 637       Smi->Modules[ModuleCount].Flags = 0;              /* Flags ??? (GN) */
 638       Smi->Modules[ModuleCount].Index = ModuleCount;
 639       Smi->Modules[ModuleCount].Unknown = 0;
 640       Smi->Modules[ModuleCount].LoadCount = 0; /* FIXME */
 641
 642       AnsiName.Length = 0;
 643       AnsiName.MaximumLength = 256;
 644       AnsiName.Buffer = Smi->Modules[ModuleCount].ImageName;
 645       RtlUnicodeStringToAnsiString(&AnsiName,
 646                                    &current->FullName,
 647                                    FALSE);
 648
 649       p = strrchr(AnsiName.Buffer, '\\');
 650       if (p == NULL)
 651         {
 652           Smi->Modules[ModuleCount].ModuleNameOffset = 0;
 653         }
 654       else
 655         {
 656           p++;
 657           Smi->Modules[ModuleCount].ModuleNameOffset = p - AnsiName.Buffer;
 658         }
 659
 660       ModuleCount++;
 661       current_entry = current_entry->Flink;
 662     }
 663
 664   KeReleaseSpinLock(&ModuleListLock, Irql);
 665
 666   return(STATUS_SUCCESS);
 667 }
 668
 669
 670 static VOID
 671 LdrpBuildModuleBaseName(PUNICODE_STRING BaseName,
 672                         PUNICODE_STRING FullName)
 673 {
 674    UNICODE_STRING Name;
 675    PWCHAR p;
 676    PWCHAR q;
 677
 678    DPRINT("LdrpBuildModuleBaseName()\n");
 679    DPRINT("FullName %wZ\n", FullName);
 680
 681    p = wcsrchr(FullName->Buffer, L'\\');
 682    if (p == NULL)
 683      {
 684         p = FullName->Buffer;
 685      }
 686    else
 687      {
 688         p++;
 689      }
 690
 691    DPRINT("p %S\n", p);
 692
 693    RtlCreateUnicodeString(&Name, p);
 694
 695    q = wcschr(Name.Buffer, L'.');
 696    if (q != NULL)
 697      {
 698         *q = (WCHAR)0;
 699      }
 700
 701    DPRINT("p %S\n", p);
 702
 703    RtlCreateUnicodeString(BaseName, Name.Buffer);
 704    RtlFreeUnicodeString(&Name);
 705 }
 706
 707
 708 static LONG
 709 LdrpCompareModuleNames(IN PUNICODE_STRING String1,
 710                        IN PUNICODE_STRING String2)
 711 {
 712   ULONG len1, len2, i;
 713   PWCHAR s1, s2, p;
 714   WCHAR  c1, c2;
 715
 716   if (String1 && String2)
 717     {
 718       /* Search String1 for last path component */
 719       len1 = String1->Length / sizeof(WCHAR);
 720       s1 = String1->Buffer;
 721       for (i = 0, p = String1->Buffer; i < String1->Length; i = i + sizeof(WCHAR), p++)
 722         {
 723           if (*p == L'\\')
 724             {
 725               if (i == String1->Length - sizeof(WCHAR))
 726                 {
 727                   s1 = NULL;
 728                   len1 = 0;
 729                 }
 730               else
 731                 {
 732                   s1 = p + 1;
 733                   len1 = (String1->Length - i) / sizeof(WCHAR);
 734                 }
 735             }
 736         }
 737
 738       /* Search String2 for last path component */
 739       len2 = String2->Length / sizeof(WCHAR);
 740       s2 = String2->Buffer;
 741       for (i = 0, p = String2->Buffer; i < String2->Length; i = i + sizeof(WCHAR), p++)
 742         {
 743           if (*p == L'\\')
 744             {
 745               if (i == String2->Length - sizeof(WCHAR))
 746                 {
 747                   s2 = NULL;
 748                   len2 = 0;
 749                 }
 750               else
 751                 {
 752                   s2 = p + 1;
 753                   len2 = (String2->Length - i) / sizeof(WCHAR);
 754                 }
 755             }
 756         }
 757
 758       /* Compare last path components */
 759       if (s1 && s2)
 760         {
 761           while (1)
 762             {
 763               c1 = len1-- ? RtlUpcaseUnicodeChar (*s1++) : 0;
 764               c2 = len2-- ? RtlUpcaseUnicodeChar (*s2++) : 0;
 765               if ((c1 == 0 && c2 == L'.') || (c1 == L'.' && c2 == 0))
 766                 return(0);
 767               if (!c1 || !c2 || c1 != c2)
 768                 return(c1 - c2);
 769             }
 770         }
 771     }
 772
 773   return(0);
 774 }
 775
 776
 777 PMODULE_OBJECT
 778 LdrGetModuleObject(PUNICODE_STRING ModuleName)
 779 {
 780   PMODULE_OBJECT Module;
 781   PLIST_ENTRY Entry;
 782   KIRQL Irql;
 783
 784   DPRINT("LdrpGetModuleObject(%wZ) called\n", ModuleName);
 785
 786   KeAcquireSpinLock(&ModuleListLock,&Irql);
 787
 788   Entry = ModuleListHead.Flink;
 789   while (Entry != &ModuleListHead)
 790     {
 791       Module = CONTAINING_RECORD(Entry, MODULE_OBJECT, ListEntry);
 792
 793       DPRINT("Comparing %wZ and %wZ\n",
 794              &Module->BaseName,
 795              ModuleName);
 796
 797       if (!LdrpCompareModuleNames(&Module->BaseName, ModuleName))
 798         {
 799           DPRINT("Module %wZ\n", &Module->BaseName);
 800           KeReleaseSpinLock(&ModuleListLock, Irql);
 801           return(Module);
 802         }
 803
 804       Entry = Entry->Flink;
 805     }
 806
 807   KeReleaseSpinLock(&ModuleListLock, Irql);
 808
 809   DPRINT("Could not find module '%wZ'\n", ModuleName);
 810
 811   return(NULL);
 812 }
 813
 814
 815 /*  ----------------------------------------------  PE Module support */
 816
 817 static BOOL
 818 PageNeedsWriteAccess(PVOID PageStart,
 819                      PVOID DriverBase,
 820                      PIMAGE_FILE_HEADER PEFileHeader,
 821                      PIMAGE_SECTION_HEADER PESectionHeaders)
 822 {
 823   BOOL NeedsWriteAccess;
 824   unsigned Idx;
 825   ULONG Characteristics;
 826   ULONG Length;
 827   PVOID BaseAddress;
 828
 829   NeedsWriteAccess = FALSE;
 830   /* Set the protections for the various parts of the driver */
 831   for (Idx = 0; Idx < PEFileHeader->NumberOfSections && ! NeedsWriteAccess; Idx++)
 832     {
 833       Characteristics = PESectionHeaders[Idx].Characteristics;
 834       if (!(Characteristics & IMAGE_SECTION_CHAR_CODE) ||
 835           (Characteristics & IMAGE_SECTION_CHAR_WRITABLE ||
 836            Characteristics & IMAGE_SECTION_CHAR_DATA ||
 837            Characteristics & IMAGE_SECTION_CHAR_BSS))
 838         {
 839           Length =
 840               max(PESectionHeaders[Idx].Misc.VirtualSize,
 841                   PESectionHeaders[Idx].SizeOfRawData);
 842           BaseAddress = PESectionHeaders[Idx].VirtualAddress + DriverBase;
 843           NeedsWriteAccess = BaseAddress < PageStart + PAGE_SIZE &&
 844                              PageStart < (PVOID)((PCHAR) BaseAddress + Length);
 845         }
 846     }
 847
 848   return(NeedsWriteAccess);
 849 }
 850
 851 static NTSTATUS
 852 LdrPEProcessModule(PVOID ModuleLoadBase,
 853                    PUNICODE_STRING FileName,
 854                    PMODULE_OBJECT *ModuleObject)
 855 {
 856   unsigned int DriverSize, Idx;
 857   ULONG RelocDelta, NumRelocs;
 858   DWORD CurrentSize, TotalRelocs;
 859   PVOID DriverBase;
 860   PULONG PEMagic;
 861   PIMAGE_DOS_HEADER PEDosHeader;
 862   PIMAGE_FILE_HEADER PEFileHeader;
 863   PIMAGE_OPTIONAL_HEADER PEOptionalHeader;
 864   PIMAGE_SECTION_HEADER PESectionHeaders;
 865   PRELOCATION_DIRECTORY RelocDir;
 866   PRELOCATION_ENTRY RelocEntry;
 867   PMODULE_OBJECT  LibraryModuleObject;
 868   PMODULE_OBJECT CreatedModuleObject;
 869   PVOID *ImportAddressList;
 870   PULONG FunctionNameList;
 871   PCHAR pName;
 872   WORD Hint;
 873   UNICODE_STRING ModuleName;
 874   UNICODE_STRING NameString;
 875   WCHAR  NameBuffer[60];
 876   MODULE_TEXT_SECTION* ModuleTextSection;
 877   NTSTATUS Status;
 878   KIRQL Irql;
 879
 880   DPRINT("Processing PE Module at module base:%08lx\n", ModuleLoadBase);
 881
 882   /*  Get header pointers  */
 883   PEDosHeader = (PIMAGE_DOS_HEADER) ModuleLoadBase;
 884   PEMagic = (PULONG) ((unsigned int) ModuleLoadBase +
 885     PEDosHeader->e_lfanew);
 886   PEFileHeader = (PIMAGE_FILE_HEADER) ((unsigned int) ModuleLoadBase +
 887     PEDosHeader->e_lfanew + sizeof(ULONG));
 888   PEOptionalHeader = (PIMAGE_OPTIONAL_HEADER) ((unsigned int) ModuleLoadBase +
 889     PEDosHeader->e_lfanew + sizeof(ULONG) + sizeof(IMAGE_FILE_HEADER));
 890   PESectionHeaders = (PIMAGE_SECTION_HEADER) ((unsigned int) ModuleLoadBase +
 891     PEDosHeader->e_lfanew + sizeof(ULONG) + sizeof(IMAGE_FILE_HEADER) +
 892     sizeof(IMAGE_OPTIONAL_HEADER));
 893   CHECKPOINT;
 894
 895   /*  Check file magic numbers  */
 896   if (PEDosHeader->e_magic != IMAGE_DOS_MAGIC)
 897     {
 898       CPRINT("Incorrect MZ magic: %04x\n", PEDosHeader->e_magic);
 899       return STATUS_UNSUCCESSFUL;
 900     }
 901   if (PEDosHeader->e_lfanew == 0)
 902     {
 903       CPRINT("Invalid lfanew offset: %08x\n", PEDosHeader->e_lfanew);
 904       return STATUS_UNSUCCESSFUL;
 905     }
 906   if (*PEMagic != IMAGE_PE_MAGIC)
 907     {
 908       CPRINT("Incorrect PE magic: %08x\n", *PEMagic);
 909       return STATUS_UNSUCCESSFUL;
 910     }
 911   if (PEFileHeader->Machine != IMAGE_FILE_MACHINE_I386)
 912     {
 913       CPRINT("Incorrect Architechture: %04x\n", PEFileHeader->Machine);
 914       return STATUS_UNSUCCESSFUL;
 915     }
 916   CHECKPOINT;
 917
 918   /* FIXME: if image is fixed-address load, then fail  */
 919
 920   /* FIXME: check/verify OS version number  */
 921
 922   DPRINT("OptionalHdrMagic:%04x LinkVersion:%d.%d\n",
 923          PEOptionalHeader->Magic,
 924          PEOptionalHeader->MajorLinkerVersion,
 925          PEOptionalHeader->MinorLinkerVersion);
 926   DPRINT("Entry Point:%08lx\n", PEOptionalHeader->AddressOfEntryPoint);
 927   CHECKPOINT;
 928
 929   /*  Determine the size of the module  */
 930   DriverSize = PEOptionalHeader->SizeOfImage;
 931   DPRINT("DriverSize %x\n",DriverSize);
 932
 933   /*  Allocate a virtual section for the module  */
 934   DriverBase = MmAllocateSection(DriverSize);
 935   if (DriverBase == 0)
 936     {
 937       CPRINT("Failed to allocate a virtual section for driver\n");
 938       return STATUS_UNSUCCESSFUL;
 939     }
 940   DbgPrint("DriverBase for %wZ: %x\n", FileName, DriverBase);
 941   CHECKPOINT;
 942   /*  Copy headers over */
 943   memcpy(DriverBase, ModuleLoadBase, PEOptionalHeader->SizeOfHeaders);
 944    CurrentSize = 0;
 945   /*  Copy image sections into virtual section  */
 946   for (Idx = 0; Idx < PEFileHeader->NumberOfSections; Idx++)
 947     {
 948       //  Copy current section into current offset of virtual section
 949       if (PESectionHeaders[Idx].Characteristics &
 950           (IMAGE_SECTION_CHAR_CODE | IMAGE_SECTION_CHAR_DATA))
 951         {
 952            DPRINT("PESectionHeaders[Idx].VirtualAddress + DriverBase %x\n",
 953                   PESectionHeaders[Idx].VirtualAddress + DriverBase);
 954            memcpy(PESectionHeaders[Idx].VirtualAddress + DriverBase,
 955                   (PVOID)(ModuleLoadBase + PESectionHeaders[Idx].PointerToRawData),
 956                   PESectionHeaders[Idx].Misc.VirtualSize > PESectionHeaders[Idx].SizeOfRawData
 957                   ? PESectionHeaders[Idx].SizeOfRawData : PESectionHeaders[Idx].Misc.VirtualSize );
 958         }
 959       else
 960         {
 961            DPRINT("PESectionHeaders[Idx].VirtualAddress + DriverBase %x\n",
 962                   PESectionHeaders[Idx].VirtualAddress + DriverBase);
 963            memset(PESectionHeaders[Idx].VirtualAddress + DriverBase,
 964                   '\0', PESectionHeaders[Idx].Misc.VirtualSize);
 965
 966         }
 967       CurrentSize += ROUND_UP(PESectionHeaders[Idx].Misc.VirtualSize,
 968                               PEOptionalHeader->SectionAlignment);
 969
 970
 971 //      CurrentBase = (PVOID)((DWORD)CurrentBase +
 972   //      ROUND_UP(PESectionHeaders[Idx].SizeOfRawData.Misc.VirtualSize,
 973     //             PEOptionalHeader->SectionAlignment));
 974     }
 975
 976   /*  Perform relocation fixups  */
 977   RelocDelta = (DWORD) DriverBase - PEOptionalHeader->ImageBase;
 978   RelocDir = (PRELOCATION_DIRECTORY)(PEOptionalHeader->DataDirectory[
 979     IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress);
 980   DPRINT("DrvrBase:%08lx ImgBase:%08lx RelocDelta:%08lx\n",
 981          DriverBase,
 982          PEOptionalHeader->ImageBase,
 983          RelocDelta);
 984   DPRINT("RelocDir %x\n",RelocDir);
 985 #if 1
 986   for (Idx = 0; Idx < PEFileHeader->NumberOfSections; Idx++)
 987     {
 988        if (PESectionHeaders[Idx].VirtualAddress == (DWORD)RelocDir)
 989          {
 990             DPRINT("Name %.8s PESectionHeader[Idx].PointerToRawData %x\n",
 991                    PESectionHeaders[Idx].Name,
 992                    PESectionHeaders[Idx].PointerToRawData);
 993             RelocDir = PESectionHeaders[Idx].PointerToRawData +
 994               ModuleLoadBase;
 995             CurrentSize = PESectionHeaders[Idx].Misc.VirtualSize;
 996             break;
 997          }
 998     }
 999 #else
1000    RelocDir = RelocDir + (ULONG)DriverBase;
1001    CurrentSize = PEOptionalHeader->DataDirectory
1002                   [IMAGE_DIRECTORY_ENTRY_BASERELOC].Size;
1003 #endif
1004   DPRINT("RelocDir %08lx CurrentSize %08lx\n", RelocDir, CurrentSize);
1005   TotalRelocs = 0;
1006   while (TotalRelocs < CurrentSize && RelocDir->SizeOfBlock != 0)
1007     {
1008       NumRelocs = (RelocDir->SizeOfBlock - sizeof(RELOCATION_DIRECTORY)) /
1009         sizeof(WORD);
1010 /*      DPRINT("RelocDir at %08lx for VA %08lx with %08lx relocs\n",
1011              RelocDir,
1012              RelocDir->VirtualAddress,
1013              NumRelocs);*/
1014       RelocEntry = (PRELOCATION_ENTRY) ((DWORD)RelocDir +
1015         sizeof(RELOCATION_DIRECTORY));
1016       for (Idx = 0; Idx < NumRelocs; Idx++)
1017         {
1018            ULONG Offset;
1019            ULONG Type;
1020            PDWORD RelocItem;
1021
1022            Offset = RelocEntry[Idx].TypeOffset & 0xfff;
1023            Type = (RelocEntry[Idx].TypeOffset >> 12) & 0xf;
1024            RelocItem = (PDWORD)(DriverBase + RelocDir->VirtualAddress +
1025                                 Offset);
1026 /*         DPRINT("  reloc at %08lx %x %s old:%08lx new:%08lx\n",
1027                   RelocItem,
1028                   Type,
1029                   Type ? "HIGHLOW" : "ABS",
1030                   *RelocItem,
1031                   (*RelocItem) + RelocDelta); */
1032           if (Type == 3)
1033             {
1034               (*RelocItem) += RelocDelta;
1035             }
1036           else if (Type != 0)
1037             {
1038               CPRINT("Unknown relocation type %x at %x\n",Type, &Type);
1039               return STATUS_UNSUCCESSFUL;
1040             }
1041         }
1042       TotalRelocs += RelocDir->SizeOfBlock;
1043       RelocDir = (PRELOCATION_DIRECTORY)((DWORD)RelocDir +
1044         RelocDir->SizeOfBlock);
1045 //      DPRINT("TotalRelocs: %08lx  CurrentSize: %08lx\n", TotalRelocs, CurrentSize);
1046     }
1047
1048   DPRINT("PEOptionalHeader->DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT] %x\n",
1049          PEOptionalHeader->DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT]
1050          .VirtualAddress);
1051   /*  Perform import fixups  */
1052   if (PEOptionalHeader->DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress)
1053     {
1054       PIMAGE_IMPORT_MODULE_DIRECTORY ImportModuleDirectory;
1055
1056       /*  Process each import module  */
1057       ImportModuleDirectory = (PIMAGE_IMPORT_MODULE_DIRECTORY)
1058         ((DWORD)DriverBase + PEOptionalHeader->
1059           DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress);
1060       DPRINT("Processeing import directory at %p\n", ImportModuleDirectory);
1061       while (ImportModuleDirectory->dwRVAModuleName)
1062         {
1063           /*  Check to make sure that import lib is kernel  */
1064           pName = (PCHAR) DriverBase +
1065             ImportModuleDirectory->dwRVAModuleName;
1066
1067           RtlCreateUnicodeStringFromAsciiz(&ModuleName, pName);
1068           DPRINT("Import module: %wZ\n", &ModuleName);
1069
1070           LibraryModuleObject = LdrGetModuleObject(&ModuleName);
1071           if (LibraryModuleObject == NULL)
1072             {
1073               DPRINT("Module '%wZ' not loaded yet\n", &ModuleName);
1074               wcscpy(NameBuffer, L"\\SystemRoot\\system32\\drivers\\");
1075               wcscat(NameBuffer, ModuleName.Buffer);
1076               RtlInitUnicodeString(&NameString, NameBuffer);
1077               Status = LdrLoadModule(&NameString, &LibraryModuleObject);
1078               if (!NT_SUCCESS(Status))
1079                 {
1080                   wcscpy(NameBuffer, L"\\SystemRoot\\system32\\");
1081                   wcscat(NameBuffer, ModuleName.Buffer);
1082                   RtlInitUnicodeString(&NameString, NameBuffer);
1083                   Status = LdrLoadModule(&NameString, &LibraryModuleObject);
1084                   if (!NT_SUCCESS(Status))
1085                     {
1086                       DPRINT1("Unknown import module: %wZ (Status %lx)\n", &ModuleName, Status);
1087                       return(Status);
1088                     }
1089                 }
1090             }
1091           /*  Get the import address list  */
1092           ImportAddressList = (PVOID *) ((DWORD)DriverBase +
1093             ImportModuleDirectory->dwRVAFunctionAddressList);
1094
1095           /*  Get the list of functions to import  */
1096           if (ImportModuleDirectory->dwRVAFunctionNameList != 0)
1097             {
1098               FunctionNameList = (PULONG) ((DWORD)DriverBase +
1099                 ImportModuleDirectory->dwRVAFunctionNameList);
1100             }
1101           else
1102             {
1103               FunctionNameList = (PULONG) ((DWORD)DriverBase +
1104                 ImportModuleDirectory->dwRVAFunctionAddressList);
1105             }
1106           /*  Walk through function list and fixup addresses  */
1107           while (*FunctionNameList != 0L)
1108             {
1109               if ((*FunctionNameList) & 0x80000000) // hint
1110                 {
1111                   pName = NULL;
1112
1113
1114                   Hint = (*FunctionNameList) & 0xffff;
1115                 }
1116               else // hint-name
1117                 {
1118                   pName = (PCHAR)((DWORD)DriverBase +
1119                                   *FunctionNameList + 2);
1120                   Hint = *(PWORD)((DWORD)DriverBase + *FunctionNameList);
1121                 }
1122               DPRINT("  Hint:%04x  Name:%s\n", Hint, pName);
1123
1124               /*  Fixup the current import symbol  */
1125               if (LibraryModuleObject != NULL)
1126                 {
1127                   *ImportAddressList = LdrGetExportAddress(LibraryModuleObject,
1128                                                            pName,
1129                                                            Hint);
1130                 }
1131               else
1132                 {
1133                   CPRINT("Unresolved kernel symbol: %s\n", pName);
1134                   return STATUS_UNSUCCESSFUL;
1135                 }
1136               ImportAddressList++;
1137               FunctionNameList++;
1138             }
1139
1140           RtlFreeUnicodeString(&ModuleName);
1141
1142           ImportModuleDirectory++;
1143         }
1144     }
1145
1146   /* Set the protections for the various parts of the driver */
1147   for (Idx = 0; Idx < PEFileHeader->NumberOfSections; Idx++)
1148     {
1149       ULONG Characteristics = PESectionHeaders[Idx].Characteristics;
1150       ULONG Length;
1151       PVOID BaseAddress;
1152       PVOID PageAddress;
1153       if (Characteristics & IMAGE_SECTION_CHAR_CODE &&
1154           !(Characteristics & IMAGE_SECTION_CHAR_WRITABLE ||
1155             Characteristics & IMAGE_SECTION_CHAR_DATA ||
1156             Characteristics & IMAGE_SECTION_CHAR_BSS))
1157         {
1158           Length =
1159               max(PESectionHeaders[Idx].Misc.VirtualSize,
1160                   PESectionHeaders[Idx].SizeOfRawData);
1161           BaseAddress = PESectionHeaders[Idx].VirtualAddress + DriverBase;
1162           PageAddress = (PVOID)PAGE_ROUND_DOWN(BaseAddress);
1163           if (! PageNeedsWriteAccess(PageAddress, DriverBase, PEFileHeader, PESectionHeaders))
1164             {
1165               MmSetPageProtect(NULL, PageAddress, PAGE_READONLY);
1166             }
1167           PageAddress = (PVOID)((PCHAR) PageAddress + PAGE_SIZE);
1168           while ((PVOID)((PCHAR) PageAddress + PAGE_SIZE) <
1169                  (PVOID)((PCHAR) BaseAddress + Length))
1170             {
1171               MmSetPageProtect(NULL, PageAddress, PAGE_READONLY);
1172               PageAddress = (PVOID)((PCHAR) PageAddress + PAGE_SIZE);
1173             }
1174           if (PageAddress < (PVOID)((PCHAR) BaseAddress + Length) &&
1175               ! PageNeedsWriteAccess(PageAddress, DriverBase, PEFileHeader, PESectionHeaders))
1176             {
1177               MmSetPageProtect(NULL, PageAddress, PAGE_READONLY);
1178             }
1179         }
1180     }
1181
1182   /* Create the module */
1183   CreatedModuleObject = ExAllocatePool(NonPagedPool, sizeof(MODULE_OBJECT));
1184   if (CreatedModuleObject == NULL)
1185     {
1186       return(STATUS_INSUFFICIENT_RESOURCES);
1187     }
1188
1189   RtlZeroMemory(CreatedModuleObject, sizeof(MODULE_OBJECT));
1190
1191    /*  Initialize ModuleObject data  */
1192   CreatedModuleObject->Base = DriverBase;
1193   CreatedModuleObject->Flags = MODULE_FLAG_PE;
1194
1195   RtlCreateUnicodeString(&CreatedModuleObject->FullName,
1196                          FileName->Buffer);
1197   LdrpBuildModuleBaseName(&CreatedModuleObject->BaseName,
1198                           &CreatedModuleObject->FullName);
1199
1200   CreatedModuleObject->EntryPoint =
1201     (PVOID)((DWORD)DriverBase +
1202             PEOptionalHeader->AddressOfEntryPoint);
1203   CreatedModuleObject->Length = DriverSize;
1204   DPRINT("EntryPoint at %x\n", CreatedModuleObject->EntryPoint);
1205
1206   CreatedModuleObject->Image.PE.FileHeader =
1207     (PIMAGE_FILE_HEADER) ((unsigned int) DriverBase + PEDosHeader->e_lfanew + sizeof(ULONG));
1208
1209   DPRINT("FileHeader at %x\n", CreatedModuleObject->Image.PE.FileHeader);
1210   CreatedModuleObject->Image.PE.OptionalHeader =
1211     (PIMAGE_OPTIONAL_HEADER) ((unsigned int) DriverBase + PEDosHeader->e_lfanew + sizeof(ULONG) +
1212     sizeof(IMAGE_FILE_HEADER));
1213   DPRINT("OptionalHeader at %x\n", CreatedModuleObject->Image.PE.OptionalHeader);
1214   CreatedModuleObject->Image.PE.SectionList =
1215     (PIMAGE_SECTION_HEADER) ((unsigned int) DriverBase + PEDosHeader->e_lfanew + sizeof(ULONG) +
1216     sizeof(IMAGE_FILE_HEADER) + sizeof(IMAGE_OPTIONAL_HEADER));
1217   DPRINT("SectionList at %x\n", CreatedModuleObject->Image.PE.SectionList);
1218
1219   /* Insert module */
1220   KeAcquireSpinLock(&ModuleListLock, &Irql);
1221   InsertTailList(&ModuleListHead,
1222                  &CreatedModuleObject->ListEntry);
1223   KeReleaseSpinLock(&ModuleListLock, Irql);
1224
1225
1226   ModuleTextSection = ExAllocatePool(NonPagedPool,
1227                                      sizeof(MODULE_TEXT_SECTION));
1228   assert(ModuleTextSection);
1229   RtlZeroMemory(ModuleTextSection, sizeof(MODULE_TEXT_SECTION));
1230   ModuleTextSection->Base = (ULONG)DriverBase;
1231   ModuleTextSection->Length = DriverSize;
1232   ModuleTextSection->Name = ExAllocatePool(NonPagedPool,
1233         (wcslen(CreatedModuleObject->BaseName.Buffer) + 1) * sizeof(WCHAR));
1234   wcscpy(ModuleTextSection->Name, CreatedModuleObject->BaseName.Buffer);
1235   ModuleTextSection->OptionalHeader =
1236     CreatedModuleObject->Image.PE.OptionalHeader;
1237   InsertTailList(&ModuleTextListHead, &ModuleTextSection->ListEntry);
1238
1239   CreatedModuleObject->TextSection = ModuleTextSection;
1240
1241   *ModuleObject = CreatedModuleObject;
1242
1243   DPRINT("Loading Module %wZ...\n", FileName);
1244
1245   if ((KdDebuggerEnabled == TRUE) && (KdDebugState & KD_DEBUG_GDB))
1246     {
1247       DPRINT("Module %wZ loaded at 0x%.08x.\n",
1248               FileName, CreatedModuleObject->Base);
1249     }
1250
1251   return STATUS_SUCCESS;
1252 }
1253
1254
1255 PVOID
1256 LdrSafePEProcessModule(PVOID ModuleLoadBase,
1257                        PVOID DriverBase,
1258                        PVOID ImportModuleBase,
1259                        PULONG DriverSize)
1260 {
1261   unsigned int Idx;
1262   ULONG RelocDelta, NumRelocs;
1263   ULONG CurrentSize, TotalRelocs;
1264   PULONG PEMagic;
1265   PIMAGE_DOS_HEADER PEDosHeader;
1266   PIMAGE_FILE_HEADER PEFileHeader;
1267   PIMAGE_OPTIONAL_HEADER PEOptionalHeader;
1268   PIMAGE_SECTION_HEADER PESectionHeaders;
1269   PRELOCATION_DIRECTORY RelocDir;
1270   PRELOCATION_ENTRY RelocEntry;
1271   PVOID *ImportAddressList;
1272   PULONG FunctionNameList;
1273   PCHAR pName;
1274   USHORT Hint;
1275
1276   ps("Processing PE Module at module base:%08lx\n", ModuleLoadBase);
1277
1278   /*  Get header pointers  */
1279   PEDosHeader = (PIMAGE_DOS_HEADER) ModuleLoadBase;
1280   PEMagic = (PULONG) ((unsigned int) ModuleLoadBase +
1281     PEDosHeader->e_lfanew);
1282   PEFileHeader = (PIMAGE_FILE_HEADER) ((unsigned int) ModuleLoadBase +
1283     PEDosHeader->e_lfanew + sizeof(ULONG));
1284   PEOptionalHeader = (PIMAGE_OPTIONAL_HEADER) ((unsigned int) ModuleLoadBase +
1285     PEDosHeader->e_lfanew + sizeof(ULONG) + sizeof(IMAGE_FILE_HEADER));
1286   PESectionHeaders = (PIMAGE_SECTION_HEADER) ((unsigned int) ModuleLoadBase +
1287     PEDosHeader->e_lfanew + sizeof(ULONG) + sizeof(IMAGE_FILE_HEADER) +
1288     sizeof(IMAGE_OPTIONAL_HEADER));
1289   CHECKPOINT;
1290
1291   /*  Check file magic numbers  */
1292   if (PEDosHeader->e_magic != IMAGE_DOS_MAGIC)
1293     {
1294       return 0;
1295     }
1296   if (PEDosHeader->e_lfanew == 0)
1297     {
1298       return 0;
1299     }
1300   if (*PEMagic != IMAGE_PE_MAGIC)
1301     {
1302       return 0;
1303     }
1304   if (PEFileHeader->Machine != IMAGE_FILE_MACHINE_I386)
1305     {
1306       return 0;
1307     }
1308
1309   ps("OptionalHdrMagic:%04x LinkVersion:%d.%d\n",
1310          PEOptionalHeader->Magic,
1311          PEOptionalHeader->MajorLinkerVersion,
1312          PEOptionalHeader->MinorLinkerVersion);
1313   ps("Entry Point:%08lx\n", PEOptionalHeader->AddressOfEntryPoint);
1314
1315   /*  Determine the size of the module  */
1316   *DriverSize = PEOptionalHeader->SizeOfImage;
1317   ps("DriverSize %x\n",*DriverSize);
1318
1319   /*  Copy headers over */
1320   if (DriverBase != ModuleLoadBase)
1321     {
1322       memcpy(DriverBase, ModuleLoadBase, PEOptionalHeader->SizeOfHeaders);
1323     }
1324
1325   ps("Hdr: 0x%X\n", (ULONG)PEOptionalHeader);
1326   ps("Hdr->SizeOfHeaders: 0x%X\n", (ULONG)PEOptionalHeader->SizeOfHeaders);
1327   ps("FileHdr->NumberOfSections: 0x%X\n", (ULONG)PEFileHeader->NumberOfSections);
1328
1329   /* Ntoskrnl.exe need no relocation fixups since it is linked to run at the same
1330      address as it is mapped */
1331   if (DriverBase != ModuleLoadBase)
1332     {
1333       CurrentSize = 0;
1334
1335   /*  Copy image sections into virtual section  */
1336   for (Idx = 0; Idx < PEFileHeader->NumberOfSections; Idx++)
1337     {
1338       //  Copy current section into current offset of virtual section
1339       if (PESectionHeaders[Idx].Characteristics &
1340           (IMAGE_SECTION_CHAR_CODE | IMAGE_SECTION_CHAR_DATA))
1341         {
1342           //ps("PESectionHeaders[Idx].VirtualAddress (%X) + DriverBase %x\n",
1343           //PESectionHeaders[Idx].VirtualAddress, PESectionHeaders[Idx].VirtualAddress + DriverBase);
1344           memcpy(PESectionHeaders[Idx].VirtualAddress + DriverBase,
1345                  (PVOID)(ModuleLoadBase + PESectionHeaders[Idx].PointerToRawData),
1346                  PESectionHeaders[Idx].Misc.VirtualSize > PESectionHeaders[Idx].SizeOfRawData ?
1347                    PESectionHeaders[Idx].SizeOfRawData : PESectionHeaders[Idx].Misc.VirtualSize );
1348         }
1349       else
1350         {
1351           ps("PESectionHeaders[Idx].VirtualAddress (%X) + DriverBase %x\n",
1352              PESectionHeaders[Idx].VirtualAddress, PESectionHeaders[Idx].VirtualAddress + DriverBase);
1353           memset(PESectionHeaders[Idx].VirtualAddress + DriverBase,
1354                  '\0',
1355                  PESectionHeaders[Idx].Misc.VirtualSize);
1356         }
1357       CurrentSize += ROUND_UP(PESectionHeaders[Idx].Misc.VirtualSize,
1358                               PEOptionalHeader->SectionAlignment);
1359     }
1360
1361   /*  Perform relocation fixups  */
1362   RelocDelta = (ULONG) DriverBase - PEOptionalHeader->ImageBase;
1363   RelocDir = (PRELOCATION_DIRECTORY)(PEOptionalHeader->DataDirectory[
1364     IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress);
1365   ps("DrvrBase:%08lx ImgBase:%08lx RelocDelta:%08lx\n",
1366          DriverBase,
1367          PEOptionalHeader->ImageBase,
1368          RelocDelta);
1369   ps("RelocDir %x\n",RelocDir);
1370
1371   for (Idx = 0; Idx < PEFileHeader->NumberOfSections; Idx++)
1372     {
1373       if (PESectionHeaders[Idx].VirtualAddress == (ULONG)RelocDir)
1374         {
1375           DPRINT("Name %.8s PESectionHeader[Idx].PointerToRawData %x\n",
1376                  PESectionHeaders[Idx].Name,
1377                  PESectionHeaders[Idx].PointerToRawData);
1378           RelocDir = PESectionHeaders[Idx].PointerToRawData + ModuleLoadBase;
1379           CurrentSize = PESectionHeaders[Idx].Misc.VirtualSize;
1380           break;
1381         }
1382     }
1383
1384   ps("RelocDir %08lx CurrentSize %08lx\n", RelocDir, CurrentSize);
1385
1386   TotalRelocs = 0;
1387   while (TotalRelocs < CurrentSize && RelocDir->SizeOfBlock != 0)
1388     {
1389       NumRelocs = (RelocDir->SizeOfBlock - sizeof(RELOCATION_DIRECTORY)) /
1390         sizeof(USHORT);
1391       RelocEntry = (PRELOCATION_ENTRY)((ULONG)RelocDir +
1392         sizeof(RELOCATION_DIRECTORY));
1393       for (Idx = 0; Idx < NumRelocs; Idx++)
1394         {
1395           ULONG Offset;
1396           ULONG Type;
1397           PULONG RelocItem;
1398
1399           Offset = RelocEntry[Idx].TypeOffset & 0xfff;
1400           Type = (RelocEntry[Idx].TypeOffset >> 12) & 0xf;
1401           RelocItem = (PULONG)(DriverBase + RelocDir->VirtualAddress + Offset);
1402           if (Type == 3)
1403             {
1404               (*RelocItem) += RelocDelta;
1405             }
1406           else if (Type != 0)
1407             {
1408               CPRINT("Unknown relocation type %x at %x\n",Type, &Type);
1409               return(0);
1410             }
1411         }
1412       TotalRelocs += RelocDir->SizeOfBlock;
1413       RelocDir = (PRELOCATION_DIRECTORY)((ULONG)RelocDir +
1414         RelocDir->SizeOfBlock);
1415     }
1416
1417     ps("PEOptionalHeader->DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT] %x\n",
1418          PEOptionalHeader->DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT]
1419          .VirtualAddress);
1420   }
1421
1422   /*  Perform import fixups  */
1423   if (PEOptionalHeader->DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress)
1424     {
1425       PIMAGE_IMPORT_MODULE_DIRECTORY ImportModuleDirectory;
1426
1427       /*  Process each import module  */
1428       ImportModuleDirectory = (PIMAGE_IMPORT_MODULE_DIRECTORY)
1429         ((ULONG)DriverBase + PEOptionalHeader->
1430           DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress);
1431
1432       ps("Processeing import directory at %p\n", ImportModuleDirectory);
1433
1434       /*  Check to make sure that import lib is kernel  */
1435       pName = (PCHAR)DriverBase + ImportModuleDirectory->dwRVAModuleName;
1436
1437       ps("Import module: %s\n", pName);
1438
1439       /*  Get the import address list  */
1440       ImportAddressList = (PVOID *)((ULONG)DriverBase +
1441         ImportModuleDirectory->dwRVAFunctionAddressList);
1442
1443       ps("  ImportModuleDirectory->dwRVAFunctionAddressList: 0x%X\n",
1444          ImportModuleDirectory->dwRVAFunctionAddressList);
1445       ps("  ImportAddressList: 0x%X\n", ImportAddressList);
1446
1447       /*  Get the list of functions to import  */
1448       if (ImportModuleDirectory->dwRVAFunctionNameList != 0)
1449         {
1450           ps("Using function name list.\n");
1451
1452           FunctionNameList = (PULONG)((ULONG)DriverBase +
1453             ImportModuleDirectory->dwRVAFunctionNameList);
1454         }
1455       else
1456         {
1457           ps("Using function address list.\n");
1458
1459           FunctionNameList = (PULONG)((ULONG)DriverBase +
1460             ImportModuleDirectory->dwRVAFunctionAddressList);
1461         }
1462
1463       /* Walk through function list and fixup addresses */
1464       while (*FunctionNameList != 0L)
1465         {
1466           if ((*FunctionNameList) & 0x80000000)
1467             {
1468                /* Hint */
1469               pName = NULL;
1470               Hint = (*FunctionNameList) & 0xffff;
1471             }
1472           else
1473             {
1474               /* Hint name */
1475               pName = (PCHAR)((ULONG)DriverBase + *FunctionNameList + 2);
1476               Hint = *(PWORD)((ULONG)DriverBase + *FunctionNameList);
1477             }
1478           //ps("  Hint:%04x  Name:%s(0x%X)(%x)\n", Hint, pName, pName, ImportAddressList);
1479
1480           *ImportAddressList = LdrSafePEGetExportAddress(ImportModuleBase,
1481                                                          pName,
1482                                                          Hint);
1483
1484           ImportAddressList++;
1485           FunctionNameList++;
1486         }
1487     }
1488
1489   ps("Finished importing.\n");
1490
1491   return(0);
1492 }
1493
1494
1495 static PVOID
1496 LdrPEGetExportAddress(PMODULE_OBJECT ModuleObject,
1497                       PCHAR Name,
1498                       USHORT Hint)
1499 {
1500   PIMAGE_EXPORT_DIRECTORY ExportDir;
1501   ULONG ExportDirSize;
1502   USHORT Idx;
1503   PVOID  ExportAddress;
1504   PWORD  OrdinalList;
1505   PDWORD FunctionList, NameList;
1506
1507    ExportDir = (PIMAGE_EXPORT_DIRECTORY)
1508      RtlImageDirectoryEntryToData(ModuleObject->Base,
1509                                   TRUE,
1510                                   IMAGE_DIRECTORY_ENTRY_EXPORT,
1511                                   &ExportDirSize);
1512    DPRINT("ExportDir %p ExportDirSize %lx\n", ExportDir, ExportDirSize);
1513    if (ExportDir == NULL)
1514      {
1515         return NULL;
1516      }
1517
1518    FunctionList = (PDWORD)((DWORD)ExportDir->AddressOfFunctions + ModuleObject->Base);
1519    NameList = (PDWORD)((DWORD)ExportDir->AddressOfNames + ModuleObject->Base);
1520    OrdinalList = (PWORD)((DWORD)ExportDir->AddressOfNameOrdinals + ModuleObject->Base);
1521
1522   ExportAddress = 0;
1523
1524   if (Name != NULL)
1525     {
1526       for (Idx = 0; Idx < ExportDir->NumberOfNames; Idx++)
1527         {
1528 #if 0
1529           DPRINT("  Name:%s  NameList[%d]:%s\n",
1530                  Name,
1531                  Idx,
1532                  (DWORD) ModuleObject->Base + NameList[Idx]);
1533
1534 #endif
1535           if (!strcmp(Name, (PCHAR) ((DWORD)ModuleObject->Base + NameList[Idx])))
1536             {
1537               ExportAddress = (PVOID) ((DWORD)ModuleObject->Base +
1538                 FunctionList[OrdinalList[Idx]]);
1539                   if (((ULONG)ExportAddress >= (ULONG)ExportDir) &&
1540                       ((ULONG)ExportAddress < (ULONG)ExportDir + ExportDirSize))
1541                     {
1542                        DPRINT("Forward: %s\n", (PCHAR)ExportAddress);
1543                        ExportAddress = LdrPEFixupForward((PCHAR)ExportAddress);
1544                        DPRINT("ExportAddress: %p\n", ExportAddress);
1545                     }
1546
1547               break;
1548             }
1549         }
1550     }
1551   else  /*  use hint  */
1552     {
1553       ExportAddress = (PVOID) ((DWORD)ModuleObject->Base +
1554         FunctionList[Hint - ExportDir->Base]);
1555     }
1556
1557   if (ExportAddress == NULL)
1558     {
1559       CPRINT("Export not found for %d:%s\n",
1560              Hint,
1561              Name != NULL ? Name : "(Ordinal)");
1562       KeBugCheck(0);
1563     }
1564
1565   return(ExportAddress);
1566 }
1567
1568
1569 static PVOID
1570 LdrSafePEGetExportAddress(PVOID ImportModuleBase,
1571                           PCHAR Name,
1572                           USHORT Hint)
1573 {
1574   USHORT Idx;
1575   PVOID  ExportAddress;
1576   PWORD  OrdinalList;
1577   PDWORD FunctionList, NameList;
1578   PIMAGE_EXPORT_DIRECTORY  ExportDir;
1579   ULONG ExportDirSize;
1580
1581   static BOOLEAN EP = FALSE;
1582
1583   ExportDir = (PIMAGE_EXPORT_DIRECTORY)
1584     RtlImageDirectoryEntryToData(ImportModuleBase,
1585           TRUE,
1586                 IMAGE_DIRECTORY_ENTRY_EXPORT,
1587                 &ExportDirSize);
1588
1589   if (!EP) {
1590     EP = TRUE;
1591     ps("ExportDir %x\n", ExportDir);
1592   }
1593
1594   FunctionList = (PDWORD)((DWORD)ExportDir->AddressOfFunctions + ImportModuleBase);
1595   NameList = (PDWORD)((DWORD)ExportDir->AddressOfNames + ImportModuleBase);
1596   OrdinalList = (PWORD)((DWORD)ExportDir->AddressOfNameOrdinals + ImportModuleBase);
1597
1598   ExportAddress = 0;
1599
1600   if (Name != NULL)
1601     {
1602       for (Idx = 0; Idx < ExportDir->NumberOfNames; Idx++)
1603         {
1604           if (!strcmp(Name, (PCHAR) ((DWORD)ImportModuleBase + NameList[Idx])))
1605                         {
1606               ExportAddress = (PVOID) ((DWORD)ImportModuleBase +
1607                 FunctionList[OrdinalList[Idx]]);
1608               break;
1609             }
1610         }
1611     }
1612   else  /*  use hint  */
1613     {
1614       ExportAddress = (PVOID) ((DWORD)ImportModuleBase +
1615
1616         FunctionList[Hint - ExportDir->Base]);
1617     }
1618
1619   if (ExportAddress == 0)
1620     {
1621       ps("Export not found for %d:%s\n",
1622          Hint,
1623          Name != NULL ? Name : "(Ordinal)");
1624       KeBugCheck(0);
1625     }
1626   return ExportAddress;
1627 }
1628
1629
1630 static PVOID
1631 LdrPEFixupForward(PCHAR ForwardName)
1632 {
1633    CHAR NameBuffer[128];
1634    UNICODE_STRING ModuleName;
1635    PCHAR p;
1636    PMODULE_OBJECT ModuleObject;
1637
1638    DPRINT("LdrPEFixupForward (%s)\n", ForwardName);
1639
1640    strcpy(NameBuffer, ForwardName);
1641    p = strchr(NameBuffer, '.');
1642    if (p == NULL)
1643      {
1644         return NULL;
1645      }
1646
1647    *p = 0;
1648
1649    DPRINT("Driver: %s  Function: %s\n", NameBuffer, p+1);
1650
1651    RtlCreateUnicodeStringFromAsciiz(&ModuleName,
1652                                     NameBuffer);
1653    ModuleObject = LdrGetModuleObject(&ModuleName);
1654    RtlFreeUnicodeString(&ModuleName);
1655
1656    DPRINT("ModuleObject: %p\n", ModuleObject);
1657
1658    if (ModuleObject == NULL)
1659      {
1660         CPRINT("LdrPEFixupForward: failed to find module %s\n", NameBuffer);
1661         return NULL;
1662      }
1663
1664   return(LdrPEGetExportAddress(ModuleObject, p+1, 0));
1665 }
1666
1667 /* EOF */