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  */
  22
  23
  24 /* INCLUDES *****************************************************************/
  25
  26 #include <limits.h>
  27 #include <ddk/ntddk.h>
  28 #include <roscfg.h>
  29 #include <internal/module.h>
  30 #include <internal/ntoskrnl.h>
  31 #include <internal/kd.h>
  32 #include <internal/io.h>
  33 #include <internal/mm.h>
  34 #include <internal/ps.h>
  35 #include <internal/ldr.h>
  36 #include <internal/pool.h>
  37 #include <internal/kd.h>
  38 #include <ntos/minmax.h>
  39
  40 #ifdef HALDBG
  41 #include <internal/ntosdbg.h>
  42 #else
  43 #define ps(args...)
  44 #endif
  45
  46 #define NDEBUG
  47 #include <internal/debug.h>
  48
  49 /* GLOBALS *******************************************************************/
  50
  51 LIST_ENTRY ModuleListHead;
  52 KSPIN_LOCK ModuleListLock;
  53
  54 LIST_ENTRY ModuleTextListHead;
  55 STATIC MODULE_TEXT_SECTION NtoskrnlTextSection;
  56 STATIC MODULE_TEXT_SECTION LdrHalTextSection;
  57 ULONG_PTR LdrHalBase;
  58
  59 #define TAG_DRIVER_MEM  TAG('D', 'R', 'V', 'M')
  60
  61 /* FORWARD DECLARATIONS ******************************************************/
  62
  63 NTSTATUS
  64 LdrProcessModule(PVOID ModuleLoadBase,
  65                  PUNICODE_STRING ModuleName,
  66                  PMODULE_OBJECT *ModuleObject);
  67
  68 PVOID
  69 LdrGetExportAddress(PMODULE_OBJECT ModuleObject,
  70                     char *Name,
  71                     unsigned short Hint);
  72
  73 static VOID
  74 LdrpBuildModuleBaseName(PUNICODE_STRING BaseName,
  75                         PUNICODE_STRING FullName);
  76
  77 static LONG
  78 LdrpCompareModuleNames(IN PUNICODE_STRING String1,
  79                        IN PUNICODE_STRING String2);
  80
  81
  82 /*  PE Driver load support  */
  83 static NTSTATUS LdrPEProcessModule(PVOID ModuleLoadBase,
  84                                    PUNICODE_STRING FileName,
  85                                    PMODULE_OBJECT *ModuleObject);
  86 static PVOID
  87 LdrPEGetExportAddress(PMODULE_OBJECT ModuleObject,
  88                       PCHAR Name,
  89                       USHORT Hint);
  90
  91 static PVOID
  92 LdrSafePEGetExportAddress(PVOID ImportModuleBase,
  93                           PCHAR Name,
  94                           USHORT Hint);
  95
  96 static PVOID
  97 LdrPEFixupForward(PCHAR ForwardName);
  98
  99
 100 /* FUNCTIONS *****************************************************************/
 101
 102 VOID
 103 LdrInitDebug(PLOADER_MODULE Module, PWCH Name)
 104 {
 105   PLIST_ENTRY current_entry;
 106   MODULE_TEXT_SECTION* current;
 107
 108   current_entry = ModuleTextListHead.Flink;
 109   while (current_entry != &ModuleTextListHead)
 110     {
 111       current =
 112         CONTAINING_RECORD(current_entry, MODULE_TEXT_SECTION, ListEntry);
 113       if (wcscmp(current->Name, Name) == 0)
 114         {
 115           break;
 116         }
 117       current_entry = current_entry->Flink;
 118     }
 119
 120   if (current_entry == &ModuleTextListHead)
 121     {
 122       return;
 123     }
 124 }
 125
 126 VOID
 127 LdrInit1(VOID)
 128 {
 129   PIMAGE_DOS_HEADER DosHeader;
 130   PIMAGE_FILE_HEADER FileHeader;
 131   PIMAGE_OPTIONAL_HEADER OptionalHeader;
 132   PIMAGE_SECTION_HEADER SectionList;
 133
 134   InitializeListHead(&ModuleTextListHead);
 135
 136   /* Setup ntoskrnl.exe text section */
 137   DosHeader = (PIMAGE_DOS_HEADER) KERNEL_BASE;
 138   FileHeader =
 139     (PIMAGE_FILE_HEADER) ((DWORD)KERNEL_BASE +
 140                           DosHeader->e_lfanew + sizeof(ULONG));
 141   OptionalHeader = (PIMAGE_OPTIONAL_HEADER)
 142     ((DWORD)FileHeader + sizeof(IMAGE_FILE_HEADER));
 143   SectionList = (PIMAGE_SECTION_HEADER)
 144     ((DWORD)OptionalHeader + sizeof(IMAGE_OPTIONAL_HEADER));
 145   NtoskrnlTextSection.Base = KERNEL_BASE;
 146   NtoskrnlTextSection.Length = SectionList[0].Misc.VirtualSize +
 147     SectionList[0].VirtualAddress;
 148   NtoskrnlTextSection.Name = KERNEL_MODULE_NAME;
 149   NtoskrnlTextSection.OptionalHeader = OptionalHeader;
 150   InsertTailList(&ModuleTextListHead, &NtoskrnlTextSection.ListEntry);
 151
 152   /* Setup hal.dll text section */
 153   DosHeader = (PIMAGE_DOS_HEADER)LdrHalBase;
 154   FileHeader =
 155     (PIMAGE_FILE_HEADER) ((DWORD)LdrHalBase +
 156                           DosHeader->e_lfanew + sizeof(ULONG));
 157   OptionalHeader = (PIMAGE_OPTIONAL_HEADER)
 158     ((DWORD)FileHeader + sizeof(IMAGE_FILE_HEADER));
 159   SectionList = (PIMAGE_SECTION_HEADER)
 160     ((DWORD)OptionalHeader + sizeof(IMAGE_OPTIONAL_HEADER));
 161   LdrHalTextSection.Base = LdrHalBase;
 162   LdrHalTextSection.Length = SectionList[0].Misc.VirtualSize +
 163     SectionList[0].VirtualAddress;
 164   LdrHalTextSection.Name = HAL_MODULE_NAME;
 165   LdrHalTextSection.OptionalHeader = OptionalHeader;
 166   InsertTailList(&ModuleTextListHead, &LdrHalTextSection.ListEntry);
 167
 168   /* Hook for KDB on initialization of the loader. */
 169   KDB_LOADERINIT_HOOK(&NtoskrnlTextSection, &LdrHalTextSection);
 170 }
 171
 172
 173 VOID
 174 LdrInitModuleManagement(VOID)
 175 {
 176   PIMAGE_DOS_HEADER DosHeader;
 177   PMODULE_OBJECT ModuleObject;
 178
 179   /* Initialize the module list and spinlock */
 180   InitializeListHead(&ModuleListHead);
 181   KeInitializeSpinLock(&ModuleListLock);
 182
 183   /* Create module object for NTOSKRNL */
 184   ModuleObject = ExAllocatePool(NonPagedPool, sizeof(MODULE_OBJECT));
 185   assert(ModuleObject != NULL);
 186   RtlZeroMemory(ModuleObject, sizeof(MODULE_OBJECT));
 187
 188   /* Initialize ModuleObject data */
 189   ModuleObject->Base = (PVOID) KERNEL_BASE;
 190   ModuleObject->Flags = MODULE_FLAG_PE;
 191   RtlCreateUnicodeString(&ModuleObject->FullName,
 192                          KERNEL_MODULE_NAME);
 193   LdrpBuildModuleBaseName(&ModuleObject->BaseName,
 194                           &ModuleObject->FullName);
 195
 196   DosHeader = (PIMAGE_DOS_HEADER) KERNEL_BASE;
 197   ModuleObject->Image.PE.FileHeader =
 198     (PIMAGE_FILE_HEADER) ((DWORD) ModuleObject->Base +
 199     DosHeader->e_lfanew + sizeof(ULONG));
 200   ModuleObject->Image.PE.OptionalHeader = (PIMAGE_OPTIONAL_HEADER)
 201     ((DWORD)ModuleObject->Image.PE.FileHeader + sizeof(IMAGE_FILE_HEADER));
 202   ModuleObject->Image.PE.SectionList = (PIMAGE_SECTION_HEADER)
 203     ((DWORD)ModuleObject->Image.PE.OptionalHeader + sizeof(IMAGE_OPTIONAL_HEADER));
 204   ModuleObject->EntryPoint = (PVOID) ((DWORD) ModuleObject->Base +
 205     ModuleObject->Image.PE.OptionalHeader->AddressOfEntryPoint);
 206   DPRINT("ModuleObject:%08x  entrypoint at %x\n", ModuleObject, ModuleObject->EntryPoint);
 207   ModuleObject->Length = ModuleObject->Image.PE.OptionalHeader->SizeOfImage;
 208   ModuleObject->TextSection = &NtoskrnlTextSection;
 209
 210   InsertTailList(&ModuleListHead,
 211                  &ModuleObject->ListEntry);
 212
 213   /* Create module object for HAL */
 214   ModuleObject = ExAllocatePool(NonPagedPool, sizeof(MODULE_OBJECT));
 215   assert(ModuleObject != NULL);
 216   RtlZeroMemory(ModuleObject, sizeof(MODULE_OBJECT));
 217
 218   /* Initialize ModuleObject data */
 219   ModuleObject->Base = (PVOID) LdrHalBase;
 220   ModuleObject->Flags = MODULE_FLAG_PE;
 221
 222   RtlCreateUnicodeString(&ModuleObject->FullName,
 223                          HAL_MODULE_NAME);
 224   LdrpBuildModuleBaseName(&ModuleObject->BaseName,
 225                           &ModuleObject->FullName);
 226
 227   DosHeader = (PIMAGE_DOS_HEADER) LdrHalBase;
 228   ModuleObject->Image.PE.FileHeader =
 229     (PIMAGE_FILE_HEADER) ((DWORD) ModuleObject->Base +
 230     DosHeader->e_lfanew + sizeof(ULONG));
 231   ModuleObject->Image.PE.OptionalHeader = (PIMAGE_OPTIONAL_HEADER)
 232     ((DWORD)ModuleObject->Image.PE.FileHeader + sizeof(IMAGE_FILE_HEADER));
 233   ModuleObject->Image.PE.SectionList = (PIMAGE_SECTION_HEADER)
 234     ((DWORD)ModuleObject->Image.PE.OptionalHeader + sizeof(IMAGE_OPTIONAL_HEADER));
 235   ModuleObject->EntryPoint = (PVOID) ((DWORD) ModuleObject->Base +
 236     ModuleObject->Image.PE.OptionalHeader->AddressOfEntryPoint);
 237   DPRINT("ModuleObject:%08x  entrypoint at %x\n", ModuleObject, ModuleObject->EntryPoint);
 238   ModuleObject->Length = ModuleObject->Image.PE.OptionalHeader->SizeOfImage;
 239   ModuleObject->TextSection = &LdrHalTextSection;
 240
 241   InsertTailList(&ModuleListHead,
 242                  &ModuleObject->ListEntry);
 243 }
 244
 245 NTSTATUS
 246 LdrpLoadImage(PUNICODE_STRING DriverName,
 247               PVOID *ModuleBase,
 248               PVOID *SectionPointer,
 249               PVOID *EntryPoint,
 250               PVOID *ExportSectionPointer)
 251 {
 252   PMODULE_OBJECT ModuleObject;
 253   NTSTATUS Status;
 254
 255   ModuleObject = LdrGetModuleObject(DriverName);
 256   if (ModuleObject == NULL)
 257     {
 258       Status = LdrLoadModule(DriverName, &ModuleObject);
 259       if (!NT_SUCCESS(Status))
 260         {
 261           return(Status);
 262         }
 263     }
 264
 265   if (ModuleBase)
 266     *ModuleBase = ModuleObject->Base;
 267
 268 //  if (SectionPointer)
 269 //    *SectionPointer = ModuleObject->
 270
 271   if (EntryPoint)
 272     *EntryPoint = ModuleObject->EntryPoint;
 273
 274 //  if (ExportSectionPointer)
 275 //    *ExportSectionPointer = ModuleObject->
 276
 277   return(STATUS_SUCCESS);
 278 }
 279
 280
 281 NTSTATUS
 282 LdrpUnloadImage(PVOID ModuleBase)
 283 {
 284   return(STATUS_NOT_IMPLEMENTED);
 285 }
 286
 287
 288 NTSTATUS
 289 LdrpLoadAndCallImage(PUNICODE_STRING ModuleName)
 290 {
 291   PDRIVER_INITIALIZE DriverEntry;
 292   PMODULE_OBJECT ModuleObject;
 293   NTSTATUS Status;
 294
 295   ModuleObject = LdrGetModuleObject(ModuleName);
 296   if (ModuleObject != NULL)
 297     {
 298       return(STATUS_IMAGE_ALREADY_LOADED);
 299     }
 300
 301   Status = LdrLoadModule(ModuleName, &ModuleObject);
 302   if (!NT_SUCCESS(Status))
 303     {
 304       return(Status);
 305     }
 306
 307   DriverEntry = (PDRIVER_INITIALIZE)ModuleObject->EntryPoint;
 308
 309   Status = DriverEntry(NULL, NULL);
 310   if (!NT_SUCCESS(Status))
 311     {
 312       LdrUnloadModule(ModuleObject);
 313     }
 314
 315   return(Status);
 316 }
 317
 318
 319 NTSTATUS
 320 LdrLoadModule(PUNICODE_STRING Filename,
 321               PMODULE_OBJECT *ModuleObject)
 322 {
 323   PVOID ModuleLoadBase;
 324   NTSTATUS Status;
 325   HANDLE FileHandle;
 326   OBJECT_ATTRIBUTES ObjectAttributes;
 327   PMODULE_OBJECT Module;
 328   FILE_STANDARD_INFORMATION FileStdInfo;
 329   IO_STATUS_BLOCK IoStatusBlock;
 330
 331   *ModuleObject = NULL;
 332
 333   DPRINT("Loading Module %wZ...\n", Filename);
 334
 335   /*  Open the Module  */
 336   InitializeObjectAttributes(&ObjectAttributes,
 337                              Filename,
 338                              0,
 339                              NULL,
 340                              NULL);
 341   CHECKPOINT;
 342   Status = NtOpenFile(&FileHandle,
 343                       FILE_ALL_ACCESS,
 344                       &ObjectAttributes,
 345                       &IoStatusBlock,
 346                       0,
 347                       FILE_SYNCHRONOUS_IO_NONALERT);
 348   CHECKPOINT;
 349   if (!NT_SUCCESS(Status))
 350     {
 351       CPRINT("Could not open module file: %wZ\n", Filename);
 352       return(Status);
 353     }
 354   CHECKPOINT;
 355
 356   /*  Get the size of the file  */
 357   Status = NtQueryInformationFile(FileHandle,
 358                                   &IoStatusBlock,
 359                                   &FileStdInfo,
 360                                   sizeof(FileStdInfo),
 361                                   FileStandardInformation);
 362   if (!NT_SUCCESS(Status))
 363     {
 364       CPRINT("Could not get file size\n");
 365       NtClose(FileHandle);
 366       return(Status);
 367     }
 368   CHECKPOINT;
 369
 370   /*  Allocate nonpageable memory for driver  */
 371   ModuleLoadBase = ExAllocatePoolWithTag(NonPagedPool,
 372                                          FileStdInfo.EndOfFile.u.LowPart,
 373                                          TAG_DRIVER_MEM);
 374   if (ModuleLoadBase == NULL)
 375     {
 376       CPRINT("Could not allocate memory for module");
 377       NtClose(FileHandle);
 378       return(STATUS_INSUFFICIENT_RESOURCES);
 379     }
 380   CHECKPOINT;
 381
 382   /*  Load driver into memory chunk  */
 383   Status = NtReadFile(FileHandle,
 384                       0, 0, 0,
 385                       &IoStatusBlock,
 386                       ModuleLoadBase,
 387                       FileStdInfo.EndOfFile.u.LowPart,
 388                       0, 0);
 389   if (!NT_SUCCESS(Status))
 390     {
 391       CPRINT("Could not read module file into memory");
 392       ExFreePool(ModuleLoadBase);
 393       NtClose(FileHandle);
 394       return(Status);
 395     }
 396   CHECKPOINT;
 397
 398   NtClose(FileHandle);
 399
 400   Status = LdrProcessModule(ModuleLoadBase,
 401                             Filename,
 402                             &Module);
 403   if (!NT_SUCCESS(Status))
 404     {
 405       CPRINT("Could not process module");
 406       ExFreePool(ModuleLoadBase);
 407       return(Status);
 408     }
 409
 410   /*  Cleanup  */
 411   ExFreePool(ModuleLoadBase);
 412
 413   *ModuleObject = Module;
 414
 415   /* Hook for KDB on loading a driver. */
 416   KDB_LOADDRIVER_HOOK(Filename, Module);
 417
 418   return(STATUS_SUCCESS);
 419 }
 420
 421
 422 NTSTATUS
 423 LdrUnloadModule(PMODULE_OBJECT ModuleObject)
 424 {
 425   KIRQL Irql;
 426
 427   /* Remove the module from the module list */
 428   KeAcquireSpinLock(&ModuleListLock,&Irql);
 429   RemoveEntryList(&ModuleObject->ListEntry);
 430   KeReleaseSpinLock(&ModuleListLock, Irql);
 431
 432   /* Hook for KDB on unloading a driver. */
 433   KDB_UNLOADDRIVER_HOOK(ModuleObject);
 434
 435   /* Free text section */
 436   if (ModuleObject->TextSection != NULL)
 437     {
 438       ExFreePool(ModuleObject->TextSection->Name);
 439       RemoveEntryList(&ModuleObject->TextSection->ListEntry);
 440       ExFreePool(ModuleObject->TextSection);
 441       ModuleObject->TextSection = NULL;
 442     }
 443
 444   /* Free module section */
 445 //  MmFreeSection(ModuleObject->Base);
 446
 447   ExFreePool(ModuleObject);
 448
 449   return(STATUS_SUCCESS);
 450 }
 451
 452
 453 NTSTATUS
 454 LdrInitializeBootStartDriver(PVOID ModuleLoadBase,
 455                              PCHAR FileName,
 456                              ULONG ModuleLength)
 457 {
 458   PMODULE_OBJECT ModuleObject;
 459   UNICODE_STRING ModuleName;
 460   PDEVICE_NODE DeviceNode;
 461   NTSTATUS Status;
 462
 463   WCHAR Buffer[MAX_PATH];
 464   ULONG Length;
 465   LPWSTR Start;
 466   LPWSTR Ext;
 467   PCHAR FileExt;
 468   CHAR TextBuffer [256];
 469   ULONG x, y, cx, cy;
 470
 471   HalQueryDisplayParameters(&x, &y, &cx, &cy);
 472   RtlFillMemory(TextBuffer, x, ' ');
 473   TextBuffer[x] = '\0';
 474   HalSetDisplayParameters(0, y-1);
 475   HalDisplayString(TextBuffer);
 476
 477   sprintf(TextBuffer, "Initializing %s...\n", FileName);
 478   HalSetDisplayParameters(0, y-1);
 479   HalDisplayString(TextBuffer);
 480   HalSetDisplayParameters(cx, cy);
 481
 482   /*  Split the filename into base name and extension  */
 483   FileExt = strrchr(FileName, '.');
 484   if (FileExt != NULL)
 485     Length = FileExt - FileName;
 486   else
 487     Length = strlen(FileName);
 488
 489   if ((FileExt != NULL) && (strcmp(FileExt, ".sym") == 0))
 490     {
 491       KDB_SYMBOLFILE_HOOK(ModuleLoadBase, FileName, Length);
 492       return(STATUS_SUCCESS);
 493     }
 494   else if ((FileExt != NULL) && !(strcmp(FileExt, ".sys") == 0))
 495     {
 496       CPRINT("Ignoring non-driver file %s\n", FileName);
 497       return STATUS_SUCCESS;
 498     }
 499
 500   /* Use IopRootDeviceNode for now */
 501   Status = IopCreateDeviceNode(IopRootDeviceNode, NULL, &DeviceNode);
 502   if (!NT_SUCCESS(Status))
 503     {
 504       CPRINT("Driver load failed, status (%x)\n", Status);
 505       return(Status);
 506     }
 507
 508   RtlCreateUnicodeStringFromAsciiz(&ModuleName,
 509                                    FileName);
 510   Status = LdrProcessModule(ModuleLoadBase,
 511                             &ModuleName,
 512                             &ModuleObject);
 513   RtlFreeUnicodeString(&ModuleName);
 514   if (ModuleObject == NULL)
 515     {
 516       IopFreeDeviceNode(DeviceNode);
 517       CPRINT("Driver load failed, status (%x)\n", Status);
 518       return(STATUS_UNSUCCESSFUL);
 519     }
 520
 521
 522   /* Get the service name from the module name */
 523   Start = wcsrchr(ModuleObject->BaseName.Buffer, L'\\');
 524   if (Start == NULL)
 525     Start = ModuleObject->BaseName.Buffer;
 526   else
 527     Start++;
 528
 529   Ext = wcsrchr(ModuleObject->BaseName.Buffer, L'.');
 530   if (Ext != NULL)
 531     Length = Ext - Start;
 532   else
 533     Length = wcslen(Start);
 534
 535   wcsncpy(Buffer, Start, Length);
 536   RtlCreateUnicodeString(&DeviceNode->ServiceName, Buffer);
 537
 538   Status = IopInitializeDriver(ModuleObject->EntryPoint,
 539                                DeviceNode, FALSE);
 540   if (!NT_SUCCESS(Status))
 541     {
 542       IopFreeDeviceNode(DeviceNode);
 543       CPRINT("Driver load failed, status (%x)\n", Status);
 544     }
 545
 546   return(Status);
 547 }
 548
 549
 550 NTSTATUS
 551 LdrProcessModule(PVOID ModuleLoadBase,
 552                  PUNICODE_STRING ModuleName,
 553                  PMODULE_OBJECT *ModuleObject)
 554 {
 555   PIMAGE_DOS_HEADER PEDosHeader;
 556
 557   /*  If MZ header exists  */
 558   PEDosHeader = (PIMAGE_DOS_HEADER) ModuleLoadBase;
 559   if (PEDosHeader->e_magic == IMAGE_DOS_MAGIC && PEDosHeader->e_lfanew != 0L)
 560     {
 561       return LdrPEProcessModule(ModuleLoadBase,
 562                                 ModuleName,
 563                                 ModuleObject);
 564     }
 565
 566   CPRINT("Module wasn't PE\n");
 567   return STATUS_UNSUCCESSFUL;
 568 }
 569
 570
 571 PVOID
 572 LdrGetExportAddress(PMODULE_OBJECT ModuleObject,
 573                     char *Name,
 574                     unsigned short Hint)
 575 {
 576   if (ModuleObject->Flags & MODULE_FLAG_PE)
 577     {
 578       return LdrPEGetExportAddress(ModuleObject, Name, Hint);
 579     }
 580   else
 581     {
 582       return 0;
 583     }
 584 }
 585
 586
 587 NTSTATUS
 588 LdrpQueryModuleInformation(PVOID Buffer,
 589                            ULONG Size,
 590                            PULONG ReqSize)
 591 {
 592   PLIST_ENTRY current_entry;
 593   PMODULE_OBJECT current;
 594   ULONG ModuleCount = 0;
 595   PSYSTEM_MODULE_INFORMATION Smi;
 596   ANSI_STRING AnsiName;
 597   PCHAR p;
 598   KIRQL Irql;
 599
 600   KeAcquireSpinLock(&ModuleListLock,&Irql);
 601
 602   /* calculate required size */
 603   current_entry = ModuleListHead.Flink;
 604   while (current_entry != (&ModuleListHead))
 605     {
 606       ModuleCount++;
 607       current_entry = current_entry->Flink;
 608     }
 609
 610   *ReqSize = sizeof(SYSTEM_MODULE_INFORMATION)+
 611     (ModuleCount - 1) * sizeof(SYSTEM_MODULE_ENTRY);
 612
 613   if (Size < *ReqSize)
 614     {
 615       KeReleaseSpinLock(&ModuleListLock, Irql);
 616       return(STATUS_INFO_LENGTH_MISMATCH);
 617     }
 618
 619   /* fill the buffer */
 620   memset(Buffer, '=', Size);
 621
 622   Smi = (PSYSTEM_MODULE_INFORMATION)Buffer;
 623   Smi->Count = ModuleCount;
 624
 625   ModuleCount = 0;
 626   current_entry = ModuleListHead.Flink;
 627   while (current_entry != (&ModuleListHead))
 628     {
 629       current = CONTAINING_RECORD(current_entry,MODULE_OBJECT,ListEntry);
 630
 631       Smi->Module[ModuleCount].Unknown2 = 0;            /* Always 0 */
 632       Smi->Module[ModuleCount].BaseAddress = current->Base;
 633       Smi->Module[ModuleCount].Size = current->Length;
 634       Smi->Module[ModuleCount].Flags = 0;               /* Flags ??? (GN) */
 635       Smi->Module[ModuleCount].EntryIndex = ModuleCount;
 636
 637       AnsiName.Length = 0;
 638       AnsiName.MaximumLength = 256;
 639       AnsiName.Buffer = Smi->Module[ModuleCount].Name;
 640       RtlUnicodeStringToAnsiString(&AnsiName,
 641                                    &current->FullName,
 642                                    FALSE);
 643
 644       p = strrchr(AnsiName.Buffer, '\\');
 645       if (p == NULL)
 646         {
 647           Smi->Module[ModuleCount].PathLength = 0;
 648           Smi->Module[ModuleCount].NameLength = strlen(AnsiName.Buffer);
 649         }
 650       else
 651         {
 652           p++;
 653           Smi->Module[ModuleCount].PathLength = p - AnsiName.Buffer;
 654           Smi->Module[ModuleCount].NameLength = strlen(p);
 655         }
 656
 657       ModuleCount++;
 658       current_entry = current_entry->Flink;
 659     }
 660
 661   KeReleaseSpinLock(&ModuleListLock, Irql);
 662
 663   return(STATUS_SUCCESS);
 664 }
 665
 666
 667 static VOID
 668 LdrpBuildModuleBaseName(PUNICODE_STRING BaseName,
 669                         PUNICODE_STRING FullName)
 670 {
 671    UNICODE_STRING Name;
 672    PWCHAR p;
 673    PWCHAR q;
 674
 675    DPRINT("LdrpBuildModuleBaseName()\n");
 676    DPRINT("FullName %wZ\n", FullName);
 677
 678    p = wcsrchr(FullName->Buffer, L'\\');
 679    if (p == NULL)
 680      {
 681         p = FullName->Buffer;
 682      }
 683    else
 684      {
 685         p++;
 686      }
 687
 688    DPRINT("p %S\n", p);
 689
 690    RtlCreateUnicodeString(&Name, p);
 691
 692    q = wcschr(Name.Buffer, L'.');
 693    if (q != NULL)
 694      {
 695         *q = (WCHAR)0;
 696      }
 697
 698    DPRINT("p %S\n", p);
 699
 700    RtlCreateUnicodeString(BaseName, Name.Buffer);
 701    RtlFreeUnicodeString(&Name);
 702 }
 703
 704
 705 static LONG
 706 LdrpCompareModuleNames(IN PUNICODE_STRING String1,
 707                        IN PUNICODE_STRING String2)
 708 {
 709   ULONG len1, len2, i;
 710   PWCHAR s1, s2, p;
 711   WCHAR  c1, c2;
 712
 713   if (String1 && String2)
 714     {
 715       /* Search String1 for last path component */
 716       len1 = String1->Length / sizeof(WCHAR);
 717       s1 = String1->Buffer;
 718       for (i = 0, p = String1->Buffer; i < String1->Length; i = i + sizeof(WCHAR), p++)
 719         {
 720           if (*p == L'\\')
 721             {
 722               if (i == String1->Length - sizeof(WCHAR))
 723                 {
 724                   s1 = NULL;
 725                   len1 = 0;
 726                 }
 727               else
 728                 {
 729                   s1 = p + 1;
 730                   len1 = (String1->Length - i) / sizeof(WCHAR);
 731                 }
 732             }
 733         }
 734
 735       /* Search String2 for last path component */
 736       len2 = String2->Length / sizeof(WCHAR);
 737       s2 = String2->Buffer;
 738       for (i = 0, p = String2->Buffer; i < String2->Length; i = i + sizeof(WCHAR), p++)
 739         {
 740           if (*p == L'\\')
 741             {
 742               if (i == String2->Length - sizeof(WCHAR))
 743                 {
 744                   s2 = NULL;
 745                   len2 = 0;
 746                 }
 747               else
 748                 {
 749                   s2 = p + 1;
 750                   len2 = (String2->Length - i) / sizeof(WCHAR);
 751                 }
 752             }
 753         }
 754
 755       /* Compare last path components */
 756       if (s1 && s2)
 757         {
 758           while (1)
 759             {
 760               c1 = len1-- ? RtlUpcaseUnicodeChar (*s1++) : 0;
 761               c2 = len2-- ? RtlUpcaseUnicodeChar (*s2++) : 0;
 762               if ((c1 == 0 && c2 == L'.') || (c1 == L'.' && c2 == 0))
 763                 return(0);
 764               if (!c1 || !c2 || c1 != c2)
 765                 return(c1 - c2);
 766             }
 767         }
 768     }
 769
 770   return(0);
 771 }
 772
 773
 774 PMODULE_OBJECT
 775 LdrGetModuleObject(PUNICODE_STRING ModuleName)
 776 {
 777   PMODULE_OBJECT Module;
 778   PLIST_ENTRY Entry;
 779   KIRQL Irql;
 780
 781   DPRINT("LdrpGetModuleObject(%wZ) called\n", ModuleName);
 782
 783   KeAcquireSpinLock(&ModuleListLock,&Irql);
 784
 785   Entry = ModuleListHead.Flink;
 786   while (Entry != &ModuleListHead)
 787     {
 788       Module = CONTAINING_RECORD(Entry, MODULE_OBJECT, ListEntry);
 789
 790       DPRINT("Comparing %wZ and %wZ\n",
 791              &Module->BaseName,
 792              ModuleName);
 793
 794       if (!LdrpCompareModuleNames(&Module->BaseName, ModuleName))
 795         {
 796           DPRINT("Module %wZ\n", &Module->BaseName);
 797           KeReleaseSpinLock(&ModuleListLock, Irql);
 798           return(Module);
 799         }
 800
 801       Entry = Entry->Flink;
 802     }
 803
 804   KeReleaseSpinLock(&ModuleListLock, Irql);
 805
 806   DPRINT("Could not find module '%wZ'\n", ModuleName);
 807
 808   return(NULL);
 809 }
 810
 811
 812 /*  ----------------------------------------------  PE Module support */
 813
 814 static NTSTATUS
 815 LdrPEProcessModule(PVOID ModuleLoadBase,
 816                    PUNICODE_STRING FileName,
 817                    PMODULE_OBJECT *ModuleObject)
 818 {
 819   unsigned int DriverSize, Idx;
 820   ULONG RelocDelta, NumRelocs;
 821   DWORD CurrentSize, TotalRelocs;
 822   PVOID DriverBase;
 823   PULONG PEMagic;
 824   PIMAGE_DOS_HEADER PEDosHeader;
 825   PIMAGE_FILE_HEADER PEFileHeader;
 826   PIMAGE_OPTIONAL_HEADER PEOptionalHeader;
 827   PIMAGE_SECTION_HEADER PESectionHeaders;
 828   PRELOCATION_DIRECTORY RelocDir;
 829   PRELOCATION_ENTRY RelocEntry;
 830   PMODULE_OBJECT  LibraryModuleObject;
 831   PMODULE_OBJECT CreatedModuleObject;
 832   PVOID *ImportAddressList;
 833   PULONG FunctionNameList;
 834   PCHAR pName;
 835   WORD Hint;
 836   UNICODE_STRING ModuleName;
 837   UNICODE_STRING NameString;
 838   WCHAR  NameBuffer[60];
 839   MODULE_TEXT_SECTION* ModuleTextSection;
 840   NTSTATUS Status;
 841   KIRQL Irql;
 842
 843   DPRINT("Processing PE Module at module base:%08lx\n", ModuleLoadBase);
 844
 845   /*  Get header pointers  */
 846   PEDosHeader = (PIMAGE_DOS_HEADER) ModuleLoadBase;
 847   PEMagic = (PULONG) ((unsigned int) ModuleLoadBase +
 848     PEDosHeader->e_lfanew);
 849   PEFileHeader = (PIMAGE_FILE_HEADER) ((unsigned int) ModuleLoadBase +
 850     PEDosHeader->e_lfanew + sizeof(ULONG));
 851   PEOptionalHeader = (PIMAGE_OPTIONAL_HEADER) ((unsigned int) ModuleLoadBase +
 852     PEDosHeader->e_lfanew + sizeof(ULONG) + sizeof(IMAGE_FILE_HEADER));
 853   PESectionHeaders = (PIMAGE_SECTION_HEADER) ((unsigned int) ModuleLoadBase +
 854     PEDosHeader->e_lfanew + sizeof(ULONG) + sizeof(IMAGE_FILE_HEADER) +
 855     sizeof(IMAGE_OPTIONAL_HEADER));
 856   CHECKPOINT;
 857
 858   /*  Check file magic numbers  */
 859   if (PEDosHeader->e_magic != IMAGE_DOS_MAGIC)
 860     {
 861       CPRINT("Incorrect MZ magic: %04x\n", PEDosHeader->e_magic);
 862       return STATUS_UNSUCCESSFUL;
 863     }
 864   if (PEDosHeader->e_lfanew == 0)
 865     {
 866       CPRINT("Invalid lfanew offset: %08x\n", PEDosHeader->e_lfanew);
 867       return STATUS_UNSUCCESSFUL;
 868     }
 869   if (*PEMagic != IMAGE_PE_MAGIC)
 870     {
 871       CPRINT("Incorrect PE magic: %08x\n", *PEMagic);
 872       return STATUS_UNSUCCESSFUL;
 873     }
 874   if (PEFileHeader->Machine != IMAGE_FILE_MACHINE_I386)
 875     {
 876       CPRINT("Incorrect Architechture: %04x\n", PEFileHeader->Machine);
 877       return STATUS_UNSUCCESSFUL;
 878     }
 879   CHECKPOINT;
 880
 881   /* FIXME: if image is fixed-address load, then fail  */
 882
 883   /* FIXME: check/verify OS version number  */
 884
 885   DPRINT("OptionalHdrMagic:%04x LinkVersion:%d.%d\n",
 886          PEOptionalHeader->Magic,
 887          PEOptionalHeader->MajorLinkerVersion,
 888          PEOptionalHeader->MinorLinkerVersion);
 889   DPRINT("Entry Point:%08lx\n", PEOptionalHeader->AddressOfEntryPoint);
 890   CHECKPOINT;
 891
 892   /*  Determine the size of the module  */
 893   DriverSize = PEOptionalHeader->SizeOfImage;
 894   DPRINT("DriverSize %x\n",DriverSize);
 895
 896   /*  Allocate a virtual section for the module  */
 897   DriverBase = MmAllocateSection(DriverSize);
 898   if (DriverBase == 0)
 899     {
 900       CPRINT("Failed to allocate a virtual section for driver\n");
 901       return STATUS_UNSUCCESSFUL;
 902     }
 903   DbgPrint("DriverBase for %wZ: %x\n", FileName, DriverBase);
 904   CHECKPOINT;
 905   /*  Copy headers over */
 906   memcpy(DriverBase, ModuleLoadBase, PEOptionalHeader->SizeOfHeaders);
 907    CurrentSize = 0;
 908   /*  Copy image sections into virtual section  */
 909   for (Idx = 0; Idx < PEFileHeader->NumberOfSections; Idx++)
 910     {
 911       //  Copy current section into current offset of virtual section
 912       if (PESectionHeaders[Idx].Characteristics &
 913           (IMAGE_SECTION_CHAR_CODE | IMAGE_SECTION_CHAR_DATA))
 914         {
 915            DPRINT("PESectionHeaders[Idx].VirtualAddress + DriverBase %x\n",
 916                   PESectionHeaders[Idx].VirtualAddress + DriverBase);
 917            memcpy(PESectionHeaders[Idx].VirtualAddress + DriverBase,
 918                   (PVOID)(ModuleLoadBase + PESectionHeaders[Idx].PointerToRawData),
 919                   PESectionHeaders[Idx].Misc.VirtualSize > PESectionHeaders[Idx].SizeOfRawData
 920                   ? PESectionHeaders[Idx].SizeOfRawData : PESectionHeaders[Idx].Misc.VirtualSize );
 921         }
 922       else
 923         {
 924            DPRINT("PESectionHeaders[Idx].VirtualAddress + DriverBase %x\n",
 925                   PESectionHeaders[Idx].VirtualAddress + DriverBase);
 926            memset(PESectionHeaders[Idx].VirtualAddress + DriverBase,
 927                   '\0', PESectionHeaders[Idx].Misc.VirtualSize);
 928
 929         }
 930       CurrentSize += ROUND_UP(PESectionHeaders[Idx].Misc.VirtualSize,
 931                               PEOptionalHeader->SectionAlignment);
 932
 933
 934 //      CurrentBase = (PVOID)((DWORD)CurrentBase +
 935   //      ROUND_UP(PESectionHeaders[Idx].SizeOfRawData.Misc.VirtualSize,
 936     //             PEOptionalHeader->SectionAlignment));
 937     }
 938
 939   /*  Perform relocation fixups  */
 940   RelocDelta = (DWORD) DriverBase - PEOptionalHeader->ImageBase;
 941   RelocDir = (PRELOCATION_DIRECTORY)(PEOptionalHeader->DataDirectory[
 942     IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress);
 943   DPRINT("DrvrBase:%08lx ImgBase:%08lx RelocDelta:%08lx\n",
 944          DriverBase,
 945          PEOptionalHeader->ImageBase,
 946          RelocDelta);
 947   DPRINT("RelocDir %x\n",RelocDir);
 948 #if 1
 949   for (Idx = 0; Idx < PEFileHeader->NumberOfSections; Idx++)
 950     {
 951        if (PESectionHeaders[Idx].VirtualAddress == (DWORD)RelocDir)
 952          {
 953             DPRINT("Name %.8s PESectionHeader[Idx].PointerToRawData %x\n",
 954                    PESectionHeaders[Idx].Name,
 955                    PESectionHeaders[Idx].PointerToRawData);
 956             RelocDir = PESectionHeaders[Idx].PointerToRawData +
 957               ModuleLoadBase;
 958             CurrentSize = PESectionHeaders[Idx].Misc.VirtualSize;
 959             break;
 960          }
 961     }
 962 #else
 963    RelocDir = RelocDir + (ULONG)DriverBase;
 964    CurrentSize = PEOptionalHeader->DataDirectory
 965                   [IMAGE_DIRECTORY_ENTRY_BASERELOC].Size;
 966 #endif
 967   DPRINT("RelocDir %08lx CurrentSize %08lx\n", RelocDir, CurrentSize);
 968   TotalRelocs = 0;
 969   while (TotalRelocs < CurrentSize && RelocDir->SizeOfBlock != 0)
 970     {
 971       NumRelocs = (RelocDir->SizeOfBlock - sizeof(RELOCATION_DIRECTORY)) /
 972         sizeof(WORD);
 973 /*      DPRINT("RelocDir at %08lx for VA %08lx with %08lx relocs\n",
 974              RelocDir,
 975              RelocDir->VirtualAddress,
 976              NumRelocs);*/
 977       RelocEntry = (PRELOCATION_ENTRY) ((DWORD)RelocDir +
 978         sizeof(RELOCATION_DIRECTORY));
 979       for (Idx = 0; Idx < NumRelocs; Idx++)
 980         {
 981            ULONG Offset;
 982            ULONG Type;
 983            PDWORD RelocItem;
 984
 985            Offset = RelocEntry[Idx].TypeOffset & 0xfff;
 986            Type = (RelocEntry[Idx].TypeOffset >> 12) & 0xf;
 987            RelocItem = (PDWORD)(DriverBase + RelocDir->VirtualAddress +
 988                                 Offset);
 989 /*         DPRINT("  reloc at %08lx %x %s old:%08lx new:%08lx\n",
 990                   RelocItem,
 991                   Type,
 992                   Type ? "HIGHLOW" : "ABS",
 993                   *RelocItem,
 994                   (*RelocItem) + RelocDelta); */
 995           if (Type == 3)
 996             {
 997               (*RelocItem) += RelocDelta;
 998             }
 999           else if (Type != 0)
1000             {
1001               CPRINT("Unknown relocation type %x at %x\n",Type, &Type);
1002               return STATUS_UNSUCCESSFUL;
1003             }
1004         }
1005       TotalRelocs += RelocDir->SizeOfBlock;
1006       RelocDir = (PRELOCATION_DIRECTORY)((DWORD)RelocDir +
1007         RelocDir->SizeOfBlock);
1008 //      DPRINT("TotalRelocs: %08lx  CurrentSize: %08lx\n", TotalRelocs, CurrentSize);
1009     }
1010
1011   DPRINT("PEOptionalHeader->DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT] %x\n",
1012          PEOptionalHeader->DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT]
1013          .VirtualAddress);
1014   /*  Perform import fixups  */
1015   if (PEOptionalHeader->DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress)
1016     {
1017       PIMAGE_IMPORT_MODULE_DIRECTORY ImportModuleDirectory;
1018
1019       /*  Process each import module  */
1020       ImportModuleDirectory = (PIMAGE_IMPORT_MODULE_DIRECTORY)
1021         ((DWORD)DriverBase + PEOptionalHeader->
1022           DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress);
1023       DPRINT("Processeing import directory at %p\n", ImportModuleDirectory);
1024       while (ImportModuleDirectory->dwRVAModuleName)
1025         {
1026           /*  Check to make sure that import lib is kernel  */
1027           pName = (PCHAR) DriverBase +
1028             ImportModuleDirectory->dwRVAModuleName;
1029
1030           RtlCreateUnicodeStringFromAsciiz(&ModuleName, pName);
1031           DPRINT("Import module: %wZ\n", &ModuleName);
1032
1033           LibraryModuleObject = LdrGetModuleObject(&ModuleName);
1034           if (LibraryModuleObject == NULL)
1035             {
1036               CPRINT("Module '%wZ' not loaded yet\n", &ModuleName);
1037               wcscpy(NameBuffer, L"\\SystemRoot\\system32\\drivers\\");
1038               wcscat(NameBuffer, ModuleName.Buffer);
1039               RtlInitUnicodeString(&NameString, NameBuffer);
1040               Status = LdrLoadModule(&NameString, &LibraryModuleObject);
1041               if (!NT_SUCCESS(Status))
1042                 {
1043                   CPRINT("Unknown import module: %wZ (Status %lx)\n", &ModuleName, Status);
1044                   return(Status);
1045                 }
1046             }
1047           /*  Get the import address list  */
1048           ImportAddressList = (PVOID *) ((DWORD)DriverBase +
1049             ImportModuleDirectory->dwRVAFunctionAddressList);
1050
1051           /*  Get the list of functions to import  */
1052           if (ImportModuleDirectory->dwRVAFunctionNameList != 0)
1053             {
1054               FunctionNameList = (PULONG) ((DWORD)DriverBase +
1055                 ImportModuleDirectory->dwRVAFunctionNameList);
1056             }
1057           else
1058             {
1059               FunctionNameList = (PULONG) ((DWORD)DriverBase +
1060                 ImportModuleDirectory->dwRVAFunctionAddressList);
1061             }
1062           /*  Walk through function list and fixup addresses  */
1063           while (*FunctionNameList != 0L)
1064             {
1065               if ((*FunctionNameList) & 0x80000000) // hint
1066                 {
1067                   pName = NULL;
1068
1069
1070                   Hint = (*FunctionNameList) & 0xffff;
1071                 }
1072               else // hint-name
1073                 {
1074                   pName = (PCHAR)((DWORD)DriverBase +
1075                                   *FunctionNameList + 2);
1076                   Hint = *(PWORD)((DWORD)DriverBase + *FunctionNameList);
1077                 }
1078               DPRINT("  Hint:%04x  Name:%s\n", Hint, pName);
1079
1080               /*  Fixup the current import symbol  */
1081               if (LibraryModuleObject != NULL)
1082                 {
1083                   *ImportAddressList = LdrGetExportAddress(LibraryModuleObject,
1084                                                            pName,
1085                                                            Hint);
1086                 }
1087               else
1088                 {
1089                   CPRINT("Unresolved kernel symbol: %s\n", pName);
1090                   return STATUS_UNSUCCESSFUL;
1091                 }
1092               ImportAddressList++;
1093               FunctionNameList++;
1094             }
1095
1096           RtlFreeUnicodeString(&ModuleName);
1097
1098           ImportModuleDirectory++;
1099         }
1100     }
1101
1102   /* Set the protections for the various parts of the driver */
1103   for (Idx = 0; Idx < PEFileHeader->NumberOfSections; Idx++)
1104     {
1105       ULONG Characteristics = PESectionHeaders[Idx].Characteristics;
1106       ULONG Length;
1107       PVOID BaseAddress;
1108       ULONG i;
1109       Length =
1110         max(PESectionHeaders[Idx].Misc.VirtualSize,
1111             PESectionHeaders[Idx].SizeOfRawData);
1112       BaseAddress = PESectionHeaders[Idx].VirtualAddress + DriverBase;
1113       if (Characteristics & IMAGE_SECTION_CHAR_CODE &&
1114           !(Characteristics & IMAGE_SECTION_CHAR_WRITABLE ||
1115             Characteristics & IMAGE_SECTION_CHAR_DATA ||
1116             Characteristics & IMAGE_SECTION_CHAR_BSS))
1117         {
1118           for (i = 0; i < PAGE_ROUND_DOWN(Length) / PAGE_SIZE; i++)
1119             {
1120               MmSetPageProtect(NULL, BaseAddress + (i * PAGE_SIZE),
1121                                PAGE_READONLY);
1122             }
1123         }
1124     }
1125
1126   /* Create the module */
1127   CreatedModuleObject = ExAllocatePool(NonPagedPool, sizeof(MODULE_OBJECT));
1128   if (CreatedModuleObject == NULL)
1129     {
1130       return(STATUS_INSUFFICIENT_RESOURCES);
1131     }
1132
1133   RtlZeroMemory(CreatedModuleObject, sizeof(MODULE_OBJECT));
1134
1135    /*  Initialize ModuleObject data  */
1136   CreatedModuleObject->Base = DriverBase;
1137   CreatedModuleObject->Flags = MODULE_FLAG_PE;
1138
1139   RtlCreateUnicodeString(&CreatedModuleObject->FullName,
1140                          FileName->Buffer);
1141   LdrpBuildModuleBaseName(&CreatedModuleObject->BaseName,
1142                           &CreatedModuleObject->FullName);
1143
1144   CreatedModuleObject->EntryPoint =
1145     (PVOID)((DWORD)DriverBase +
1146             PEOptionalHeader->AddressOfEntryPoint);
1147   CreatedModuleObject->Length = DriverSize;
1148   DPRINT("EntryPoint at %x\n", CreatedModuleObject->EntryPoint);
1149
1150   CreatedModuleObject->Image.PE.FileHeader =
1151     (PIMAGE_FILE_HEADER) ((unsigned int) DriverBase + PEDosHeader->e_lfanew + sizeof(ULONG));
1152
1153   DPRINT("FileHeader at %x\n", CreatedModuleObject->Image.PE.FileHeader);
1154   CreatedModuleObject->Image.PE.OptionalHeader =
1155     (PIMAGE_OPTIONAL_HEADER) ((unsigned int) DriverBase + PEDosHeader->e_lfanew + sizeof(ULONG) +
1156     sizeof(IMAGE_FILE_HEADER));
1157   DPRINT("OptionalHeader at %x\n", CreatedModuleObject->Image.PE.OptionalHeader);
1158   CreatedModuleObject->Image.PE.SectionList =
1159     (PIMAGE_SECTION_HEADER) ((unsigned int) DriverBase + PEDosHeader->e_lfanew + sizeof(ULONG) +
1160     sizeof(IMAGE_FILE_HEADER) + sizeof(IMAGE_OPTIONAL_HEADER));
1161   DPRINT("SectionList at %x\n", CreatedModuleObject->Image.PE.SectionList);
1162
1163   /* Insert module */
1164   KeAcquireSpinLock(&ModuleListLock, &Irql);
1165   InsertTailList(&ModuleListHead,
1166                  &CreatedModuleObject->ListEntry);
1167   KeReleaseSpinLock(&ModuleListLock, Irql);
1168
1169
1170   ModuleTextSection = ExAllocatePool(NonPagedPool,
1171                                      sizeof(MODULE_TEXT_SECTION));
1172   assert(ModuleTextSection);
1173   RtlZeroMemory(ModuleTextSection, sizeof(MODULE_TEXT_SECTION));
1174   ModuleTextSection->Base = (ULONG)DriverBase;
1175   ModuleTextSection->Length = DriverSize;
1176   ModuleTextSection->Name = ExAllocatePool(NonPagedPool,
1177         (wcslen(CreatedModuleObject->BaseName.Buffer) + 1) * sizeof(WCHAR));
1178   wcscpy(ModuleTextSection->Name, CreatedModuleObject->BaseName.Buffer);
1179   ModuleTextSection->OptionalHeader =
1180     CreatedModuleObject->Image.PE.OptionalHeader;
1181   InsertTailList(&ModuleTextListHead, &ModuleTextSection->ListEntry);
1182
1183   CreatedModuleObject->TextSection = ModuleTextSection;
1184
1185   *ModuleObject = CreatedModuleObject;
1186
1187   DPRINT("Loading Module %wZ...\n", FileName);
1188
1189   if ((KdDebuggerEnabled == TRUE) && (KdDebugState & KD_DEBUG_GDB))
1190     {
1191       DPRINT("Module %wZ loaded at 0x%.08x.\n",
1192               FileName, CreatedModuleObject->Base);
1193     }
1194
1195   return STATUS_SUCCESS;
1196 }
1197
1198
1199 PVOID
1200 LdrSafePEProcessModule(PVOID ModuleLoadBase,
1201                        PVOID DriverBase,
1202                        PVOID ImportModuleBase,
1203                        PULONG DriverSize)
1204 {
1205   unsigned int Idx;
1206   ULONG RelocDelta, NumRelocs;
1207   ULONG CurrentSize, TotalRelocs;
1208   PULONG PEMagic;
1209   PIMAGE_DOS_HEADER PEDosHeader;
1210   PIMAGE_FILE_HEADER PEFileHeader;
1211   PIMAGE_OPTIONAL_HEADER PEOptionalHeader;
1212   PIMAGE_SECTION_HEADER PESectionHeaders;
1213   PRELOCATION_DIRECTORY RelocDir;
1214   PRELOCATION_ENTRY RelocEntry;
1215   PVOID *ImportAddressList;
1216   PULONG FunctionNameList;
1217   PCHAR pName;
1218   USHORT Hint;
1219
1220   ps("Processing PE Module at module base:%08lx\n", ModuleLoadBase);
1221
1222   /*  Get header pointers  */
1223   PEDosHeader = (PIMAGE_DOS_HEADER) ModuleLoadBase;
1224   PEMagic = (PULONG) ((unsigned int) ModuleLoadBase +
1225     PEDosHeader->e_lfanew);
1226   PEFileHeader = (PIMAGE_FILE_HEADER) ((unsigned int) ModuleLoadBase +
1227     PEDosHeader->e_lfanew + sizeof(ULONG));
1228   PEOptionalHeader = (PIMAGE_OPTIONAL_HEADER) ((unsigned int) ModuleLoadBase +
1229     PEDosHeader->e_lfanew + sizeof(ULONG) + sizeof(IMAGE_FILE_HEADER));
1230   PESectionHeaders = (PIMAGE_SECTION_HEADER) ((unsigned int) ModuleLoadBase +
1231     PEDosHeader->e_lfanew + sizeof(ULONG) + sizeof(IMAGE_FILE_HEADER) +
1232     sizeof(IMAGE_OPTIONAL_HEADER));
1233   CHECKPOINT;
1234
1235   /*  Check file magic numbers  */
1236   if (PEDosHeader->e_magic != IMAGE_DOS_MAGIC)
1237     {
1238       return 0;
1239     }
1240   if (PEDosHeader->e_lfanew == 0)
1241     {
1242       return 0;
1243     }
1244   if (*PEMagic != IMAGE_PE_MAGIC)
1245     {
1246       return 0;
1247     }
1248   if (PEFileHeader->Machine != IMAGE_FILE_MACHINE_I386)
1249     {
1250       return 0;
1251     }
1252
1253   ps("OptionalHdrMagic:%04x LinkVersion:%d.%d\n",
1254          PEOptionalHeader->Magic,
1255          PEOptionalHeader->MajorLinkerVersion,
1256          PEOptionalHeader->MinorLinkerVersion);
1257   ps("Entry Point:%08lx\n", PEOptionalHeader->AddressOfEntryPoint);
1258
1259   /*  Determine the size of the module  */
1260   *DriverSize = PEOptionalHeader->SizeOfImage;
1261   ps("DriverSize %x\n",*DriverSize);
1262
1263   /*  Copy headers over */
1264   if (DriverBase != ModuleLoadBase)
1265     {
1266       memcpy(DriverBase, ModuleLoadBase, PEOptionalHeader->SizeOfHeaders);
1267     }
1268
1269   ps("Hdr: 0x%X\n", (ULONG)PEOptionalHeader);
1270   ps("Hdr->SizeOfHeaders: 0x%X\n", (ULONG)PEOptionalHeader->SizeOfHeaders);
1271   ps("FileHdr->NumberOfSections: 0x%X\n", (ULONG)PEFileHeader->NumberOfSections);
1272
1273   /* Ntoskrnl.exe need no relocation fixups since it is linked to run at the same
1274      address as it is mapped */
1275   if (DriverBase != ModuleLoadBase)
1276     {
1277       CurrentSize = 0;
1278
1279   /*  Copy image sections into virtual section  */
1280   for (Idx = 0; Idx < PEFileHeader->NumberOfSections; Idx++)
1281     {
1282       //  Copy current section into current offset of virtual section
1283       if (PESectionHeaders[Idx].Characteristics &
1284           (IMAGE_SECTION_CHAR_CODE | IMAGE_SECTION_CHAR_DATA))
1285         {
1286           //ps("PESectionHeaders[Idx].VirtualAddress (%X) + DriverBase %x\n",
1287           //PESectionHeaders[Idx].VirtualAddress, PESectionHeaders[Idx].VirtualAddress + DriverBase);
1288           memcpy(PESectionHeaders[Idx].VirtualAddress + DriverBase,
1289                  (PVOID)(ModuleLoadBase + PESectionHeaders[Idx].PointerToRawData),
1290                  PESectionHeaders[Idx].Misc.VirtualSize > PESectionHeaders[Idx].SizeOfRawData ?
1291                    PESectionHeaders[Idx].SizeOfRawData : PESectionHeaders[Idx].Misc.VirtualSize );
1292         }
1293       else
1294         {
1295           ps("PESectionHeaders[Idx].VirtualAddress (%X) + DriverBase %x\n",
1296              PESectionHeaders[Idx].VirtualAddress, PESectionHeaders[Idx].VirtualAddress + DriverBase);
1297           memset(PESectionHeaders[Idx].VirtualAddress + DriverBase,
1298                  '\0',
1299                  PESectionHeaders[Idx].Misc.VirtualSize);
1300         }
1301       CurrentSize += ROUND_UP(PESectionHeaders[Idx].Misc.VirtualSize,
1302                               PEOptionalHeader->SectionAlignment);
1303     }
1304
1305   /*  Perform relocation fixups  */
1306   RelocDelta = (ULONG) DriverBase - PEOptionalHeader->ImageBase;
1307   RelocDir = (PRELOCATION_DIRECTORY)(PEOptionalHeader->DataDirectory[
1308     IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress);
1309   ps("DrvrBase:%08lx ImgBase:%08lx RelocDelta:%08lx\n",
1310          DriverBase,
1311          PEOptionalHeader->ImageBase,
1312          RelocDelta);
1313   ps("RelocDir %x\n",RelocDir);
1314
1315   for (Idx = 0; Idx < PEFileHeader->NumberOfSections; Idx++)
1316     {
1317       if (PESectionHeaders[Idx].VirtualAddress == (ULONG)RelocDir)
1318         {
1319           DPRINT("Name %.8s PESectionHeader[Idx].PointerToRawData %x\n",
1320                  PESectionHeaders[Idx].Name,
1321                  PESectionHeaders[Idx].PointerToRawData);
1322           RelocDir = PESectionHeaders[Idx].PointerToRawData + ModuleLoadBase;
1323           CurrentSize = PESectionHeaders[Idx].Misc.VirtualSize;
1324           break;
1325         }
1326     }
1327
1328   ps("RelocDir %08lx CurrentSize %08lx\n", RelocDir, CurrentSize);
1329
1330   TotalRelocs = 0;
1331   while (TotalRelocs < CurrentSize && RelocDir->SizeOfBlock != 0)
1332     {
1333       NumRelocs = (RelocDir->SizeOfBlock - sizeof(RELOCATION_DIRECTORY)) /
1334         sizeof(USHORT);
1335       RelocEntry = (PRELOCATION_ENTRY)((ULONG)RelocDir +
1336         sizeof(RELOCATION_DIRECTORY));
1337       for (Idx = 0; Idx < NumRelocs; Idx++)
1338         {
1339           ULONG Offset;
1340           ULONG Type;
1341           PDWORD RelocItem;
1342
1343           Offset = RelocEntry[Idx].TypeOffset & 0xfff;
1344           Type = (RelocEntry[Idx].TypeOffset >> 12) & 0xf;
1345           RelocItem = (PULONG)(DriverBase + RelocDir->VirtualAddress + Offset);
1346           if (Type == 3)
1347             {
1348               (*RelocItem) += RelocDelta;
1349             }
1350           else if (Type != 0)
1351             {
1352               CPRINT("Unknown relocation type %x at %x\n",Type, &Type);
1353               return(0);
1354             }
1355         }
1356       TotalRelocs += RelocDir->SizeOfBlock;
1357       RelocDir = (PRELOCATION_DIRECTORY)((ULONG)RelocDir +
1358         RelocDir->SizeOfBlock);
1359     }
1360
1361     ps("PEOptionalHeader->DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT] %x\n",
1362          PEOptionalHeader->DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT]
1363          .VirtualAddress);
1364   }
1365
1366   /*  Perform import fixups  */
1367   if (PEOptionalHeader->DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress)
1368     {
1369       PIMAGE_IMPORT_MODULE_DIRECTORY ImportModuleDirectory;
1370
1371       /*  Process each import module  */
1372       ImportModuleDirectory = (PIMAGE_IMPORT_MODULE_DIRECTORY)
1373         ((ULONG)DriverBase + PEOptionalHeader->
1374           DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress);
1375
1376       ps("Processeing import directory at %p\n", ImportModuleDirectory);
1377
1378       /*  Check to make sure that import lib is kernel  */
1379       pName = (PCHAR)DriverBase + ImportModuleDirectory->dwRVAModuleName;
1380
1381       ps("Import module: %s\n", pName);
1382
1383       /*  Get the import address list  */
1384       ImportAddressList = (PVOID *)((ULONG)DriverBase +
1385         ImportModuleDirectory->dwRVAFunctionAddressList);
1386
1387       ps("  ImportModuleDirectory->dwRVAFunctionAddressList: 0x%X\n",
1388          ImportModuleDirectory->dwRVAFunctionAddressList);
1389       ps("  ImportAddressList: 0x%X\n", ImportAddressList);
1390
1391       /*  Get the list of functions to import  */
1392       if (ImportModuleDirectory->dwRVAFunctionNameList != 0)
1393         {
1394           ps("Using function name list.\n");
1395
1396           FunctionNameList = (PULONG)((ULONG)DriverBase +
1397             ImportModuleDirectory->dwRVAFunctionNameList);
1398         }
1399       else
1400         {
1401           ps("Using function address list.\n");
1402
1403           FunctionNameList = (PULONG)((ULONG)DriverBase +
1404             ImportModuleDirectory->dwRVAFunctionAddressList);
1405         }
1406
1407       /* Walk through function list and fixup addresses */
1408       while (*FunctionNameList != 0L)
1409         {
1410           if ((*FunctionNameList) & 0x80000000)
1411             {
1412                /* Hint */
1413               pName = NULL;
1414               Hint = (*FunctionNameList) & 0xffff;
1415             }
1416           else
1417             {
1418               /* Hint name */
1419               pName = (PCHAR)((ULONG)DriverBase + *FunctionNameList + 2);
1420               Hint = *(PWORD)((ULONG)DriverBase + *FunctionNameList);
1421             }
1422           //ps("  Hint:%04x  Name:%s(0x%X)(%x)\n", Hint, pName, pName, ImportAddressList);
1423
1424           *ImportAddressList = LdrSafePEGetExportAddress(ImportModuleBase,
1425                                                          pName,
1426                                                          Hint);
1427
1428           ImportAddressList++;
1429           FunctionNameList++;
1430         }
1431     }
1432
1433   ps("Finished importing.\n");
1434
1435   return(0);
1436 }
1437
1438
1439 static PVOID
1440 LdrPEGetExportAddress(PMODULE_OBJECT ModuleObject,
1441                       PCHAR Name,
1442                       USHORT Hint)
1443 {
1444   PIMAGE_EXPORT_DIRECTORY ExportDir;
1445   ULONG ExportDirSize;
1446   USHORT Idx;
1447   PVOID  ExportAddress;
1448   PWORD  OrdinalList;
1449   PDWORD FunctionList, NameList;
1450
1451    ExportDir = (PIMAGE_EXPORT_DIRECTORY)
1452      RtlImageDirectoryEntryToData(ModuleObject->Base,
1453                                   TRUE,
1454                                   IMAGE_DIRECTORY_ENTRY_EXPORT,
1455                                   &ExportDirSize);
1456    DPRINT("ExportDir %p ExportDirSize %lx\n", ExportDir, ExportDirSize);
1457    if (ExportDir == NULL)
1458      {
1459         return NULL;
1460      }
1461
1462    FunctionList = (PDWORD)((DWORD)ExportDir->AddressOfFunctions + ModuleObject->Base);
1463    NameList = (PDWORD)((DWORD)ExportDir->AddressOfNames + ModuleObject->Base);
1464    OrdinalList = (PWORD)((DWORD)ExportDir->AddressOfNameOrdinals + ModuleObject->Base);
1465
1466   ExportAddress = 0;
1467
1468   if (Name != NULL)
1469     {
1470       for (Idx = 0; Idx < ExportDir->NumberOfNames; Idx++)
1471         {
1472 #if 0
1473           DPRINT("  Name:%s  NameList[%d]:%s\n",
1474                  Name,
1475                  Idx,
1476                  (DWORD) ModuleObject->Base + NameList[Idx]);
1477
1478 #endif
1479           if (!strcmp(Name, (PCHAR) ((DWORD)ModuleObject->Base + NameList[Idx])))
1480             {
1481               ExportAddress = (PVOID) ((DWORD)ModuleObject->Base +
1482                 FunctionList[OrdinalList[Idx]]);
1483                   if (((ULONG)ExportAddress >= (ULONG)ExportDir) &&
1484                       ((ULONG)ExportAddress < (ULONG)ExportDir + ExportDirSize))
1485                     {
1486                        DPRINT("Forward: %s\n", (PCHAR)ExportAddress);
1487                        ExportAddress = LdrPEFixupForward((PCHAR)ExportAddress);
1488                        DPRINT("ExportAddress: %p\n", ExportAddress);
1489                     }
1490
1491               break;
1492             }
1493         }
1494     }
1495   else  /*  use hint  */
1496     {
1497       ExportAddress = (PVOID) ((DWORD)ModuleObject->Base +
1498         FunctionList[Hint - ExportDir->Base]);
1499     }
1500
1501   if (ExportAddress == NULL)
1502     {
1503       CPRINT("Export not found for %d:%s\n",
1504              Hint,
1505              Name != NULL ? Name : "(Ordinal)");
1506       KeBugCheck(0);
1507     }
1508
1509   return(ExportAddress);
1510 }
1511
1512
1513 static PVOID
1514 LdrSafePEGetExportAddress(PVOID ImportModuleBase,
1515                           PCHAR Name,
1516                           USHORT Hint)
1517 {
1518   USHORT Idx;
1519   PVOID  ExportAddress;
1520   PWORD  OrdinalList;
1521   PDWORD FunctionList, NameList;
1522   PIMAGE_EXPORT_DIRECTORY  ExportDir;
1523   ULONG ExportDirSize;
1524
1525   static BOOLEAN EP = FALSE;
1526
1527   ExportDir = (PIMAGE_EXPORT_DIRECTORY)
1528     RtlImageDirectoryEntryToData(ImportModuleBase,
1529           TRUE,
1530                 IMAGE_DIRECTORY_ENTRY_EXPORT,
1531                 &ExportDirSize);
1532
1533   if (!EP) {
1534     EP = TRUE;
1535     ps("ExportDir %x\n", ExportDir);
1536   }
1537
1538   FunctionList = (PDWORD)((DWORD)ExportDir->AddressOfFunctions + ImportModuleBase);
1539   NameList = (PDWORD)((DWORD)ExportDir->AddressOfNames + ImportModuleBase);
1540   OrdinalList = (PWORD)((DWORD)ExportDir->AddressOfNameOrdinals + ImportModuleBase);
1541
1542   ExportAddress = 0;
1543
1544   if (Name != NULL)
1545     {
1546       for (Idx = 0; Idx < ExportDir->NumberOfNames; Idx++)
1547         {
1548           if (!strcmp(Name, (PCHAR) ((DWORD)ImportModuleBase + NameList[Idx])))
1549                         {
1550               ExportAddress = (PVOID) ((DWORD)ImportModuleBase +
1551                 FunctionList[OrdinalList[Idx]]);
1552               break;
1553             }
1554         }
1555     }
1556   else  /*  use hint  */
1557     {
1558       ExportAddress = (PVOID) ((DWORD)ImportModuleBase +
1559
1560         FunctionList[Hint - ExportDir->Base]);
1561     }
1562
1563   if (ExportAddress == 0)
1564     {
1565       ps("Export not found for %d:%s\n",
1566          Hint,
1567          Name != NULL ? Name : "(Ordinal)");
1568       KeBugCheck(0);
1569     }
1570   return ExportAddress;
1571 }
1572
1573
1574 static PVOID
1575 LdrPEFixupForward(PCHAR ForwardName)
1576 {
1577    CHAR NameBuffer[128];
1578    UNICODE_STRING ModuleName;
1579    PCHAR p;
1580    PMODULE_OBJECT ModuleObject;
1581
1582    DPRINT("LdrPEFixupForward (%s)\n", ForwardName);
1583
1584    strcpy(NameBuffer, ForwardName);
1585    p = strchr(NameBuffer, '.');
1586    if (p == NULL)
1587      {
1588         return NULL;
1589      }
1590
1591    *p = 0;
1592
1593    DPRINT("Driver: %s  Function: %s\n", NameBuffer, p+1);
1594
1595    RtlCreateUnicodeStringFromAsciiz(&ModuleName,
1596                                     NameBuffer);
1597    ModuleObject = LdrGetModuleObject(&ModuleName);
1598    RtlFreeUnicodeString(&ModuleName);
1599
1600    DPRINT("ModuleObject: %p\n", ModuleObject);
1601
1602    if (ModuleObject == NULL)
1603      {
1604         CPRINT("LdrPEFixupForward: failed to find module %s\n", NameBuffer);
1605         return NULL;
1606      }
1607
1608   return(LdrPEGetExportAddress(ModuleObject, p+1, 0));
1609 }
1610
1611 /* EOF */