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reactos/reactos/ntoskrnl/ldr/loader.c
David Welch 126768af64 Lots of changes to the kernel 
svn path=/trunk/; revision=527
1999-05-29 00:15:17 +00:00

1294 lines
40 KiB
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/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: ntoskrnl/ldr/loader.c
* PURPOSE: Loaders for PE executables
* PROGRAMMERS: Jean Michault
* Rex Jolliff (rex@lvcablemodem.com)
* UPDATE HISTORY:
* DW 22/05/98 Created
* RJJ 10/12/98 Completed image loader function and added hooks for MZ/PE
* RJJ 10/12/98 Built driver loader function and added hooks for PE/COFF
* RJJ 10/12/98 Rolled in David's code to load COFF drivers
* JM 14/12/98 Built initial PE user module loader
* RJJ 06/03/99 Moved user PE loader into NTDLL
*/
/* INCLUDES *****************************************************************/
#include <windows.h>
#include <internal/i386/segment.h>
#include <internal/linkage.h>
#include <internal/module.h>
#include <internal/ntoskrnl.h>
#include <internal/mmhal.h>
#include <internal/ob.h>
#include <internal/ps.h>
#include <string.h>
#include <internal/string.h>
#include <internal/symbol.h>
#include <ddk/ntddk.h>
#define NDEBUG
#include <internal/debug.h>
/* FIXME: this should appear in a kernel header file */
NTSTATUS IoInitializeDriver(PDRIVER_INITIALIZE DriverEntry);
/* MACROS ********************************************************************/
#define MODULE_ROOT_NAME L"\\Modules\\"
/* GLOBALS *******************************************************************/
POBJECT_TYPE ObModuleType = NULL;
/* FORWARD DECLARATIONS ******************************************************/
NTSTATUS LdrLoadDriver(PUNICODE_STRING Filename);
NTSTATUS LdrProcessDriver(PVOID ModuleLoadBase);
PMODULE_OBJECT LdrLoadModule(PUNICODE_STRING Filename);
PMODULE_OBJECT LdrProcessModule(PVOID ModuleLoadBase);
PVOID LdrGetExportAddress(PMODULE_OBJECT ModuleObject, char *Name, unsigned short Hint);
static PIMAGE_SECTION_HEADER LdrPEGetEnclosingSectionHeader(DWORD RVA,
PMODULE_OBJECT ModuleObject);
static NTSTATUS LdrCreateModule(PVOID ObjectBody,
PVOID Parent,
PWSTR RemainingPath,
POBJECT_ATTRIBUTES ObjectAttributes);
/* PE Driver load support */
static PMODULE_OBJECT LdrPEProcessModule(PVOID ModuleLoadBase);
static PVOID LdrPEGetExportAddress(PMODULE_OBJECT ModuleObject,
char *Name,
unsigned short Hint);
static unsigned int LdrGetKernelSymbolAddr(char *Name);
/* COFF Driver load support */
static PMODULE_OBJECT LdrCOFFProcessModule(PVOID ModuleLoadBase);
static BOOLEAN LdrCOFFDoRelocations(module *Module, unsigned int SectionIndex);
static BOOLEAN LdrCOFFDoAddr32Reloc(module *Module, SCNHDR *Section, RELOC *Relocation);
static BOOLEAN LdrCOFFDoReloc32Reloc(module *Module, SCNHDR *Section, RELOC *Relocation);
static void LdrCOFFGetSymbolName(module *Module, unsigned int Idx, char *Name);
static unsigned int LdrCOFFGetSymbolValue(module *Module, unsigned int Idx);
static unsigned int LdrCOFFGetSymbolValueByName(module *Module, char *SymbolName, unsigned int Idx);
/* FUNCTIONS *****************************************************************/
VOID LdrInitModuleManagement(VOID)
{
HANDLE DirHandle, ModuleHandle;
NTSTATUS Status;
WCHAR NameBuffer[60];
ANSI_STRING AnsiString;
UNICODE_STRING ModuleName;
OBJECT_ATTRIBUTES ObjectAttributes;
PIMAGE_DOS_HEADER DosHeader;
PMODULE_OBJECT ModuleObject;
/* Register the process object type */
ObModuleType = ExAllocatePool(NonPagedPool, sizeof(OBJECT_TYPE));
ObModuleType->TotalObjects = 0;
ObModuleType->TotalHandles = 0;
ObModuleType->MaxObjects = ULONG_MAX;
ObModuleType->MaxHandles = ULONG_MAX;
ObModuleType->PagedPoolCharge = 0;
ObModuleType->NonpagedPoolCharge = sizeof(MODULE);
ObModuleType->Dump = NULL;
ObModuleType->Open = NULL;
ObModuleType->Close = NULL;
ObModuleType->Delete = NULL;
ObModuleType->Parse = NULL;
ObModuleType->Security = NULL;
ObModuleType->QueryName = NULL;
ObModuleType->OkayToClose = NULL;
ObModuleType->Create = LdrCreateModule;
RtlInitAnsiString(&AnsiString, "Module");
RtlAnsiStringToUnicodeString(&ObModuleType->TypeName, &AnsiString, TRUE);
/* Create Modules object directory */
wcscpy(NameBuffer, MODULE_ROOT_NAME);
*(wcsrchr(NameBuffer, L'\\')) = 0;
ModuleName.Length = ModuleName.MaximumLength = wcslen(NameBuffer);
ModuleName.Buffer = NameBuffer;
InitializeObjectAttributes(&ObjectAttributes,
&ModuleName,
0,
NULL,
NULL);
DPRINT("Create dir: %W\n", &ModuleName);
Status = ZwCreateDirectoryObject(&DirHandle, 0, &ObjectAttributes);
assert(NT_SUCCESS(Status));
/* Add module entry for NTOSKRNL */
wcscpy(NameBuffer, MODULE_ROOT_NAME);
wcscat(NameBuffer, L"ntoskrnl.exe");
ModuleName.Length = ModuleName.MaximumLength = wcslen(NameBuffer);
ModuleName.Buffer = NameBuffer;
DPRINT("Kernel's Module name is: %W\n", &ModuleName);
/* Initialize ObjectAttributes for ModuleObject */
InitializeObjectAttributes(&ObjectAttributes,
&ModuleName,
0,
NULL,
NULL);
/* Create module object */
ModuleHandle = 0;
ModuleObject = ObCreateObject(&ModuleHandle,
STANDARD_RIGHTS_REQUIRED,
&ObjectAttributes,
ObModuleType);
assert(ModuleObject != NULL);
/* Initialize ModuleObject data */
ModuleObject->Base = (PVOID) KERNEL_BASE;
ModuleObject->Flags = MODULE_FLAG_PE;
DosHeader = (PIMAGE_DOS_HEADER) KERNEL_BASE;
ModuleObject->Image.PE.FileHeader =
(PIMAGE_FILE_HEADER) ((DWORD) ModuleObject->Base +
DosHeader->e_lfanew + sizeof(ULONG));
ModuleObject->Image.PE.OptionalHeader = (PIMAGE_OPTIONAL_HEADER)
((DWORD)ModuleObject->Image.PE.FileHeader + sizeof(IMAGE_FILE_HEADER));
ModuleObject->Image.PE.SectionList = (PIMAGE_SECTION_HEADER)
((DWORD)ModuleObject->Image.PE.OptionalHeader + sizeof(IMAGE_OPTIONAL_HEADER));
ModuleObject->EntryPoint = (PVOID) ((DWORD) ModuleObject->Base +
ModuleObject->Image.PE.OptionalHeader->AddressOfEntryPoint);
DPRINT("ModuleObject:%08x entrypoint at %x\n", ModuleObject, ModuleObject->EntryPoint);
/* FIXME: Add fake module entry for HAL */
}
static NTSTATUS
LdrCreateModule(PVOID ObjectBody,
PVOID Parent,
PWSTR RemainingPath,
POBJECT_ATTRIBUTES ObjectAttributes)
{
DPRINT("LdrCreateModule(ObjectBody %x, Parent %x, RemainingPath %w)\n",
ObjectBody,
Parent,
RemainingPath);
if (RemainingPath != NULL && wcschr(RemainingPath + 1, '\\') != NULL)
{
return STATUS_UNSUCCESSFUL;
}
if (Parent != NULL && RemainingPath != NULL)
{
ObAddEntryDirectory(Parent, ObjectBody, RemainingPath + 1);
}
return STATUS_SUCCESS;
}
/*
* load the auto config drivers.
*/
VOID LdrLoadAutoConfigDrivers(VOID)
{
NTSTATUS Status;
ANSI_STRING AnsiDriverName;
UNICODE_STRING DriverName;
RtlInitAnsiString(&AnsiDriverName,"\\??\\C:\\reactos\\system\\drivers\\keyboard.sys");
RtlAnsiStringToUnicodeString(&DriverName, &AnsiDriverName, TRUE);
Status = LdrLoadDriver(&DriverName);
RtlFreeUnicodeString(&DriverName);
if (!NT_SUCCESS(Status))
{
DbgPrint("driver load failed, status;%d(%x)\n", Status, Status);
DbgPrintErrorMessage(Status);
}
RtlInitAnsiString(&AnsiDriverName,"\\??\\C:\\reactos\\system\\drivers\\blue.sys");
RtlAnsiStringToUnicodeString(&DriverName, &AnsiDriverName, TRUE);
Status = LdrLoadDriver(&DriverName);
RtlFreeUnicodeString(&DriverName);
if (!NT_SUCCESS(Status))
{
DbgPrint("driver load failed, status;%d(%x)\n", Status, Status);
DbgPrintErrorMessage(Status);
}
}
/*
* FUNCTION: Loads a kernel driver
* ARGUMENTS:
* FileName = Driver to load
* RETURNS: Status
*/
NTSTATUS
LdrLoadDriver(PUNICODE_STRING Filename)
{
PMODULE_OBJECT ModuleObject;
ModuleObject = LdrLoadModule(Filename);
if (ModuleObject == 0)
{
return STATUS_UNSUCCESSFUL;
}
/* FIXME: should we dereference the ModuleObject here? */
return IoInitializeDriver(ModuleObject->EntryPoint);
}
PMODULE_OBJECT
LdrLoadModule(PUNICODE_STRING Filename)
{
PVOID ModuleLoadBase;
NTSTATUS Status;
HANDLE FileHandle;
OBJECT_ATTRIBUTES ObjectAttributes;
PMODULE_OBJECT ModuleObject;
FILE_STANDARD_INFORMATION FileStdInfo;
WCHAR NameBuffer[60];
PWSTR RemainingPath;
UNICODE_STRING ModuleName;
DPRINT("Loading Module %W...\n", Filename);
/* Check for module already loaded */
wcscpy(NameBuffer, MODULE_ROOT_NAME);
if (wcsrchr(Filename->Buffer, '\\') != 0)
{
wcscat(NameBuffer, wcsrchr(Filename->Buffer, '\\') + 1);
}
else
{
wcscat(NameBuffer, Filename->Buffer);
}
ModuleName.Length = ModuleName.MaximumLength = wcslen(NameBuffer);
ModuleName.Buffer = NameBuffer;
InitializeObjectAttributes(&ObjectAttributes,
&ModuleName,
0,
NULL,
NULL);
Status = ObFindObject(&ObjectAttributes,
(PVOID *) &ModuleObject,
&RemainingPath);
CHECKPOINT;
if (NT_SUCCESS(Status) && *RemainingPath == 0)
{
return ModuleObject;
}
CHECKPOINT;
if (!wcsncmp(Filename->Buffer, MODULE_ROOT_NAME, wcslen(MODULE_ROOT_NAME)))
{
return 0;
}
/* Open the Module */
InitializeObjectAttributes(&ObjectAttributes,
Filename,
0,
NULL,
NULL);
CHECKPOINT;
Status = ZwOpenFile(&FileHandle,
FILE_ALL_ACCESS,
&ObjectAttributes,
NULL, 0, 0);
CHECKPOINT;
if (!NT_SUCCESS(Status))
{
DbgPrint("Could not open module file: %W\n", Filename);
return 0;
}
CHECKPOINT;
/* Get the size of the file */
Status = ZwQueryInformationFile(FileHandle,
NULL,
&FileStdInfo,
sizeof(FileStdInfo),
FileStandardInformation);
if (!NT_SUCCESS(Status))
{
DbgPrint("Could not get file size\n");
return 0;
}
CHECKPOINT;
/* Allocate nonpageable memory for driver */
ModuleLoadBase = ExAllocatePool(NonPagedPool,
FileStdInfo.EndOfFile.u.LowPart);
if (ModuleLoadBase == NULL)
{
DbgPrint("could not allocate memory for module");
return 0;
}
CHECKPOINT;
/* Load driver into memory chunk */
Status = ZwReadFile(FileHandle,
0, 0, 0, 0,
ModuleLoadBase,
FileStdInfo.EndOfFile.u.LowPart,
0, 0);
if (!NT_SUCCESS(Status))
{
DbgPrint("could not read module file into memory");
ExFreePool(ModuleLoadBase);
return 0;
}
CHECKPOINT;
ZwClose(FileHandle);
ModuleObject = LdrProcessModule(ModuleLoadBase);
/* Cleanup */
ExFreePool(ModuleLoadBase);
return ModuleObject;
}
NTSTATUS
LdrProcessDriver(PVOID ModuleLoadBase)
{
PMODULE_OBJECT ModuleObject;
ModuleObject = LdrProcessModule(ModuleLoadBase);
if (ModuleObject == 0)
{
return STATUS_UNSUCCESSFUL;
}
/* FIXME: should we dereference the ModuleObject here? */
return IoInitializeDriver(ModuleObject->EntryPoint);
}
PMODULE_OBJECT
LdrProcessModule(PVOID ModuleLoadBase)
{
PIMAGE_DOS_HEADER PEDosHeader;
/* If MZ header exists */
PEDosHeader = (PIMAGE_DOS_HEADER) ModuleLoadBase;
if (PEDosHeader->e_magic == IMAGE_DOS_MAGIC && PEDosHeader->e_lfanew != 0L)
{
return LdrPEProcessModule(ModuleLoadBase);
}
#if 0
if (PEDosHeader->e_magic == IMAGE_DOS_MAGIC)
{
return 0;
}
else /* Assume COFF format and load */
{
return LdrCOFFProcessModule(ModuleLoadBase);
}
#endif
return 0;
}
PVOID
LdrGetExportAddress(PMODULE_OBJECT ModuleObject,
char *Name,
unsigned short Hint)
{
if (ModuleObject->Flags & MODULE_FLAG_PE)
{
return LdrPEGetExportAddress(ModuleObject, Name, Hint);
}
else
{
return 0;
}
}
/* ---------------------------------------------- PE Module support */
PMODULE_OBJECT
LdrPEProcessModule(PVOID ModuleLoadBase)
{
unsigned int DriverSize, Idx, Idx2;
ULONG RelocDelta, NumRelocs;
DWORD CurrentSize, TotalRelocs;
PVOID DriverBase, CurrentBase;
PULONG PEMagic;
PIMAGE_DOS_HEADER PEDosHeader;
PIMAGE_FILE_HEADER PEFileHeader;
PIMAGE_OPTIONAL_HEADER PEOptionalHeader;
PIMAGE_SECTION_HEADER PESectionHeaders;
PIMAGE_EXPORT_DIRECTORY ExportDirectory;
PRELOCATION_DIRECTORY RelocDir;
PRELOCATION_ENTRY RelocEntry;
PMODULE_OBJECT LibraryModuleObject;
HANDLE ModuleHandle;
PMODULE_OBJECT ModuleObject;
PVOID *ImportAddressList;
PULONG FunctionNameList;
PCHAR pName, SymbolNameBuf;
WORD Hint;
OBJECT_ATTRIBUTES ObjectAttributes;
UNICODE_STRING ModuleName;
WCHAR NameBuffer[60];
DPRINT("Processing PE Module at module base:%08lx\n", ModuleLoadBase);
/* Get header pointers */
PEDosHeader = (PIMAGE_DOS_HEADER) ModuleLoadBase;
PEMagic = (PULONG) ((unsigned int) ModuleLoadBase +
PEDosHeader->e_lfanew);
PEFileHeader = (PIMAGE_FILE_HEADER) ((unsigned int) ModuleLoadBase +
PEDosHeader->e_lfanew + sizeof(ULONG));
PEOptionalHeader = (PIMAGE_OPTIONAL_HEADER) ((unsigned int) ModuleLoadBase +
PEDosHeader->e_lfanew + sizeof(ULONG) + sizeof(IMAGE_FILE_HEADER));
PESectionHeaders = (PIMAGE_SECTION_HEADER) ((unsigned int) ModuleLoadBase +
PEDosHeader->e_lfanew + sizeof(ULONG) + sizeof(IMAGE_FILE_HEADER) +
sizeof(IMAGE_OPTIONAL_HEADER));
CHECKPOINT;
/* Check file magic numbers */
if (PEDosHeader->e_magic != IMAGE_DOS_MAGIC)
{
DbgPrint("Incorrect MZ magic: %04x\n", PEDosHeader->e_magic);
return 0;
}
if (PEDosHeader->e_lfanew == 0)
{
DbgPrint("Invalid lfanew offset: %08x\n", PEDosHeader->e_lfanew);
return 0;
}
if (*PEMagic != IMAGE_PE_MAGIC)
{
DbgPrint("Incorrect PE magic: %08x\n", *PEMagic);
return 0;
}
if (PEFileHeader->Machine != IMAGE_FILE_MACHINE_I386)
{
DbgPrint("Incorrect Architechture: %04x\n", PEFileHeader->Machine);
return 0;
}
CHECKPOINT;
/* FIXME: if image is fixed-address load, then fail */
/* FIXME: check/verify OS version number */
DPRINT("OptionalHdrMagic:%04x LinkVersion:%d.%d\n",
PEOptionalHeader->Magic,
PEOptionalHeader->MajorLinkerVersion,
PEOptionalHeader->MinorLinkerVersion);
DPRINT("Entry Point:%08lx\n", PEOptionalHeader->AddressOfEntryPoint);
CHECKPOINT;
/* Determine the size of the module */
DriverSize = PEOptionalHeader->SizeOfImage;
DPRINT("DriverSize %x\n",DriverSize);
/* Allocate a virtual section for the module */
DriverBase = MmAllocateSection(DriverSize);
if (DriverBase == 0)
{
DbgPrint("Failed to allocate a virtual section for driver\n");
return 0;
}
CHECKPOINT;
DPRINT("Module is at base %x\n",DriverBase);
/* Copy image sections into virtual section */
memcpy(DriverBase, ModuleLoadBase, PESectionHeaders[0].PointerToRawData);
CurrentBase = (PVOID) ((DWORD)DriverBase + PESectionHeaders[0].PointerToRawData);
CurrentSize = 0;
for (Idx = 0; Idx < PEFileHeader->NumberOfSections; Idx++)
{
/* Copy current section into current offset of virtual section */
if (PESectionHeaders[Idx].Characteristics &
(IMAGE_SECTION_CHAR_CODE | IMAGE_SECTION_CHAR_DATA))
{
DPRINT("PESectionHeaders[Idx].VirtualAddress + DriverBase %x\n",
PESectionHeaders[Idx].VirtualAddress + DriverBase);
memcpy(PESectionHeaders[Idx].VirtualAddress + DriverBase,
(PVOID)(ModuleLoadBase + PESectionHeaders[Idx].PointerToRawData),
PESectionHeaders[Idx].SizeOfRawData);
}
else
{
DPRINT("PESectionHeaders[Idx].VirtualAddress + DriverBase %x\n",
PESectionHeaders[Idx].VirtualAddress + DriverBase);
memset(PESectionHeaders[Idx].VirtualAddress + DriverBase,
'\0', PESectionHeaders[Idx].SizeOfRawData);
}
CurrentSize += ROUND_UP(PESectionHeaders[Idx].SizeOfRawData,
PEOptionalHeader->SectionAlignment);
CurrentBase = (PVOID)((DWORD)CurrentBase +
ROUND_UP(PESectionHeaders[Idx].SizeOfRawData,
PEOptionalHeader->SectionAlignment));
}
/* Perform relocation fixups */
RelocDelta = (DWORD) DriverBase - PEOptionalHeader->ImageBase;
RelocDir = (PRELOCATION_DIRECTORY)(PEOptionalHeader->DataDirectory[
IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress);
DPRINT("DrvrBase:%08lx ImgBase:%08lx RelocDelta:%08lx\n",
DriverBase,
PEOptionalHeader->ImageBase,
RelocDelta);
DPRINT("RelocDir %x\n",RelocDir);
for (Idx = 0; Idx < PEFileHeader->NumberOfSections; Idx++)
{
if (PESectionHeaders[Idx].VirtualAddress == (DWORD)RelocDir)
{
DPRINT("Name %.8s PESectionHeader[Idx].PointerToRawData %x\n",
PESectionHeaders[Idx].Name,
PESectionHeaders[Idx].PointerToRawData);
RelocDir = PESectionHeaders[Idx].PointerToRawData +
ModuleLoadBase;
CurrentSize = PESectionHeaders[Idx].Misc.VirtualSize;
break;
}
}
DPRINT("RelocDir %08lx CurrentSize %08lx\n", RelocDir, CurrentSize);
TotalRelocs = 0;
while (TotalRelocs < CurrentSize && RelocDir->SizeOfBlock != 0)
{
NumRelocs = (RelocDir->SizeOfBlock - sizeof(RELOCATION_DIRECTORY)) /
sizeof(WORD);
/* DPRINT("RelocDir at %08lx for VA %08lx with %08lx relocs\n",
RelocDir,
RelocDir->VirtualAddress,
NumRelocs);*/
RelocEntry = (PRELOCATION_ENTRY) ((DWORD)RelocDir +
sizeof(RELOCATION_DIRECTORY));
for (Idx = 0; Idx < NumRelocs; Idx++)
{
ULONG Offset;
ULONG Type;
PDWORD RelocItem;
Offset = RelocEntry[Idx].TypeOffset & 0xfff;
Type = (RelocEntry[Idx].TypeOffset >> 12) & 0xf;
RelocItem = (PDWORD)(DriverBase + RelocDir->VirtualAddress +
Offset);
/* DPRINT(" reloc at %08lx %x %s old:%08lx new:%08lx\n",
RelocItem,
Type,
Type ? "HIGHLOW" : "ABS",
*RelocItem,
(*RelocItem) + RelocDelta); */
if (Type == 3)
{
(*RelocItem) += RelocDelta;
}
else if (Type != 0)
{
DbgPrint("Unknown relocation type %x\n",Type);
return 0;
}
}
TotalRelocs += RelocDir->SizeOfBlock;
RelocDir = (PRELOCATION_DIRECTORY)((DWORD)RelocDir +
RelocDir->SizeOfBlock);
// DPRINT("TotalRelocs: %08lx CurrentSize: %08lx\n", TotalRelocs, CurrentSize);
}
DPRINT("PEOptionalHeader->DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT] %x\n",
PEOptionalHeader->DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT]
.VirtualAddress);
/* Perform import fixups */
if (PEOptionalHeader->DataDirectory[
IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress)
{
PIMAGE_IMPORT_MODULE_DIRECTORY ImportModuleDirectory;
SymbolNameBuf = ExAllocatePool(NonPagedPool, 512);
/* Process each import module */
ImportModuleDirectory = (PIMAGE_IMPORT_MODULE_DIRECTORY)
((DWORD)DriverBase + PEOptionalHeader->
DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress);
DPRINT("Processeing import directory at %p\n", ImportModuleDirectory);
while (ImportModuleDirectory->dwRVAModuleName)
{
/* Check to make sure that import lib is kernel */
pName = (PCHAR) DriverBase +
ImportModuleDirectory->dwRVAModuleName;
if (!strcmp(pName, "ntoskrnl.exe") || !strcmp(pName, "HAL.dll"))
{
LibraryModuleObject = NULL;
DPRINT("Kernel imports\n");
}
else
{
wcscpy(NameBuffer, MODULE_ROOT_NAME);
for (Idx = 0; NameBuffer[Idx] != 0; Idx++)
;
for (Idx2 = 0; pName[Idx2] != '\0'; Idx2++)
{
NameBuffer[Idx + Idx2] = (WCHAR) pName[Idx2];
}
NameBuffer[Idx + Idx2] = 0;
ModuleName.Length = ModuleName.MaximumLength = wcslen(NameBuffer);
ModuleName.Buffer = NameBuffer;
DPRINT("Import module: %W\n", &ModuleName);
LibraryModuleObject = LdrLoadModule(&ModuleName);
if (LibraryModuleObject == 0)
{
DbgPrint("Unknown import module: %W\n", &ModuleName);
}
}
/* Get the import address list */
ImportAddressList = (PVOID *) ((DWORD)DriverBase +
ImportModuleDirectory->dwRVAFunctionAddressList);
/* Get the list of functions to import */
if (ImportModuleDirectory->dwRVAFunctionNameList != 0)
{
FunctionNameList = (PULONG) ((DWORD)DriverBase +
ImportModuleDirectory->dwRVAFunctionNameList);
}
else
{
FunctionNameList = (PULONG) ((DWORD)DriverBase +
ImportModuleDirectory->dwRVAFunctionAddressList);
}
/* Walk through function list and fixup addresses */
while (*FunctionNameList != 0L)
{
if ((*FunctionNameList) & 0x80000000) // hint
{
pName = NULL;
Hint = (*FunctionNameList) & 0xffff;
}
else // hint-name
{
pName = (PCHAR)((DWORD)DriverBase +
*FunctionNameList + 2);
Hint = *(PWORD)((DWORD)DriverBase + *FunctionNameList);
}
DPRINT(" Hint:%04x Name:%s\n", Hint, pName);
/* Fixup the current import symbol */
if (LibraryModuleObject != NULL)
{
*ImportAddressList = LdrGetExportAddress(LibraryModuleObject,
pName,
Hint);
}
else
{
/* Get address for symbol */
*SymbolNameBuf = '_';
strcpy(SymbolNameBuf + 1, pName);
*ImportAddressList = (PVOID) LdrGetKernelSymbolAddr(SymbolNameBuf);
if (*ImportAddressList == 0L)
{
DbgPrint("Unresolved kernel symbol: %s\n", pName);
}
}
ImportAddressList++;
FunctionNameList++;
}
ImportModuleDirectory++;
}
ExFreePool(SymbolNameBuf);
}
/* Create ModuleName string */
wcscpy(NameBuffer, MODULE_ROOT_NAME);
if (PEOptionalHeader->DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT]
.VirtualAddress != 0)
{
ExportDirectory = (PIMAGE_EXPORT_DIRECTORY) (DriverBase +
PEOptionalHeader->DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT]
.VirtualAddress);
wcscat(NameBuffer, DriverBase + ExportDirectory->Name);
}
else
{
char buf[12];
sprintf(buf, "%08X", (DWORD) DriverBase);
for (Idx = 0; NameBuffer[Idx] != 0; Idx++)
;
Idx2 = 0;
while ((NameBuffer[Idx + Idx2] = (WCHAR) buf[Idx2]) != 0)
Idx2++;
}
ModuleName.Length = ModuleName.MaximumLength = wcslen(NameBuffer);
ModuleName.Buffer = NameBuffer;
DPRINT("Module name is: %W\n", &ModuleName);
/* Initialize ObjectAttributes for ModuleObject */
InitializeObjectAttributes(&ObjectAttributes,
&ModuleName,
0,
NULL,
NULL);
/* Create module object */
ModuleHandle = 0;
ModuleObject = ObCreateObject(&ModuleHandle,
STANDARD_RIGHTS_REQUIRED,
&ObjectAttributes,
ObModuleType);
/* Initialize ModuleObject data */
ModuleObject->Base = DriverBase;
ModuleObject->Flags = MODULE_FLAG_PE;
ModuleObject->EntryPoint = (PVOID) ((DWORD)DriverBase +
PEOptionalHeader->AddressOfEntryPoint);
DPRINT("entrypoint at %x\n", ModuleObject->EntryPoint);
ModuleObject->Image.PE.FileHeader =
(PIMAGE_FILE_HEADER) ((unsigned int) DriverBase +
PEDosHeader->e_lfanew + sizeof(ULONG));
DPRINT("FileHeader at %x\n", ModuleObject->Image.PE.FileHeader);
ModuleObject->Image.PE.OptionalHeader =
(PIMAGE_OPTIONAL_HEADER) ((unsigned int) DriverBase +
PEDosHeader->e_lfanew + sizeof(ULONG) + sizeof(IMAGE_FILE_HEADER));
DPRINT("OptionalHeader at %x\n", ModuleObject->Image.PE.OptionalHeader);
ModuleObject->Image.PE.SectionList =
(PIMAGE_SECTION_HEADER) ((unsigned int) DriverBase +
PEDosHeader->e_lfanew + sizeof(ULONG) + sizeof(IMAGE_FILE_HEADER) +
sizeof(IMAGE_OPTIONAL_HEADER));
DPRINT("SectionList at %x\n", ModuleObject->Image.PE.SectionList);
return ModuleObject;
}
static PVOID
LdrPEGetExportAddress(PMODULE_OBJECT ModuleObject,
char *Name,
unsigned short Hint)
{
WORD Idx;
DWORD ExportsStartRVA, ExportsEndRVA, Delta;
PVOID ExportAddress;
PWORD OrdinalList;
PDWORD FunctionList, NameList;
PIMAGE_SECTION_HEADER SectionHeader;
PIMAGE_EXPORT_DIRECTORY ExportDirectory;
ExportsStartRVA = ModuleObject->Image.PE.OptionalHeader->DataDirectory
[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress;
ExportsEndRVA = ExportsStartRVA +
ModuleObject->Image.PE.OptionalHeader->DataDirectory
[IMAGE_DIRECTORY_ENTRY_EXPORT].Size;
/* Get the IMAGE_SECTION_HEADER that contains the exports. This is
usually the .edata section, but doesn't have to be. */
SectionHeader = LdrPEGetEnclosingSectionHeader(ExportsStartRVA, ModuleObject);
if (!SectionHeader)
{
return 0;
}
Delta = (DWORD)(SectionHeader->VirtualAddress -
SectionHeader->PointerToRawData);
ExportDirectory = MakePtr(PIMAGE_EXPORT_DIRECTORY,
ModuleObject->Base,
ExportsStartRVA - Delta);
FunctionList = (PDWORD)((DWORD)ExportDirectory->AddressOfFunctions -
Delta + ModuleObject->Base);
NameList = (PDWORD)((DWORD)ExportDirectory->AddressOfNames -
Delta + ModuleObject->Base);
OrdinalList = (PWORD)((DWORD)ExportDirectory->AddressOfNameOrdinals -
Delta + ModuleObject->Base);
DPRINT("Delta:%08x\n", Delta);
DPRINT("Func:%08x RVA:%08x Name:%08x RVA:%08x Ord:%08x RVA:%08x\n", FunctionList,
ExportDirectory->AddressOfFunctions, NameList,
ExportDirectory->AddressOfNames, OrdinalList,
ExportDirectory->AddressOfNameOrdinals);
DPRINT("NumNames:%d NumFuncs:%d\n", ExportDirectory->NumberOfNames,
ExportDirectory->NumberOfFunctions);
for(;;);
ExportAddress = 0;
if (Name != NULL)
{
for (Idx = 0; Idx < ExportDirectory->NumberOfNames; Idx++)
{
DPRINT(" Name:%s NameList[%d]:%s\n", Name, Idx, NameList[Idx]);
if (!strcmp(Name, (PCHAR) ((DWORD)ModuleObject->Base + NameList[Idx])))
{
ExportAddress = (PVOID) ((DWORD)ModuleObject->Base +
FunctionList[OrdinalList[Idx]]);
break;
}
}
}
else /* use hint */
{
ExportAddress = (PVOID) ((DWORD)ModuleObject->Base +
FunctionList[Hint - ExportDirectory->Base]);
}
if (ExportAddress == 0)
{
DbgPrint("Export not found for %d:%s\n", Hint, Name != NULL ? Name : "(Ordinal)");
}
return ExportAddress;
}
static PIMAGE_SECTION_HEADER
LdrPEGetEnclosingSectionHeader(DWORD RVA,
PMODULE_OBJECT ModuleObject)
{
PIMAGE_SECTION_HEADER SectionHeader = SECHDROFFSET(ModuleObject->Base);
unsigned i;
for (i = 0; i < ModuleObject->Image.PE.FileHeader->NumberOfSections;
i++, SectionHeader++)
{
/* Is the RVA within this section? */
if ((RVA >= SectionHeader->VirtualAddress) &&
(RVA < (SectionHeader->VirtualAddress + SectionHeader->Misc.VirtualSize)))
{
return SectionHeader;
}
}
return 0;
}
/* ------------------------------------------- COFF Module support */
PMODULE_OBJECT
LdrCOFFProcessModule(PVOID ModuleLoadBase)
{
BOOLEAN FoundEntry;
char SymbolName[255];
int i;
ULONG EntryOffset;
FILHDR *FileHeader;
AOUTHDR *AOUTHeader;
module *Module;
PVOID EntryRoutine;
HANDLE ModuleHandle;
PMODULE_OBJECT ModuleObject;
OBJECT_ATTRIBUTES ObjectAttributes;
UNICODE_STRING ModuleName;
WCHAR NameBuffer[60];
/* Get header pointers */
FileHeader = ModuleLoadBase;
AOUTHeader = ModuleLoadBase + FILHSZ;
CHECKPOINT;
/* Check COFF magic value */
if (I386BADMAG(*FileHeader))
{
DbgPrint("Module has bad magic value (%x)\n",
FileHeader->f_magic);
return 0;
}
CHECKPOINT;
/* Allocate and initialize a module definition structure */
Module = (module *) ExAllocatePool(NonPagedPool, sizeof(module));
if (Module == NULL)
{
return 0;
}
Module->sym_list = (SYMENT *)(ModuleLoadBase + FileHeader->f_symptr);
Module->str_tab = (char *)(ModuleLoadBase + FileHeader->f_symptr +
FileHeader->f_nsyms * SYMESZ);
Module->scn_list = (SCNHDR *)(ModuleLoadBase + FILHSZ +
FileHeader->f_opthdr);
Module->size = 0;
Module->raw_data_off = (ULONG) ModuleLoadBase;
Module->nsyms = FileHeader->f_nsyms;
CHECKPOINT;
/* Determine the length of the module */
for (i = 0; i < FileHeader->f_nscns; i++)
{
DPRINT("Section name: %.8s\n", Module->scn_list[i].s_name);
DPRINT("size %x vaddr %x size %x\n",
Module->size,
Module->scn_list[i].s_vaddr,
Module->scn_list[i].s_size);
if (Module->scn_list[i].s_flags & STYP_TEXT)
{
Module->text_base = Module->scn_list[i].s_vaddr;
}
if (Module->scn_list[i].s_flags & STYP_DATA)
{
Module->data_base = Module->scn_list[i].s_vaddr;
}
if (Module->scn_list[i].s_flags & STYP_BSS)
{
Module->bss_base = Module->scn_list[i].s_vaddr;
}
if (Module->size <
(Module->scn_list[i].s_vaddr + Module->scn_list[i].s_size))
{
Module->size = Module->size + Module->scn_list[i].s_vaddr +
Module->scn_list[i].s_size;
}
}
CHECKPOINT;
/* Allocate a section for the module */
Module->base = (unsigned int) MmAllocateSection(Module->size);
if (Module->base == 0)
{
DbgPrint("Failed to alloc section for module\n");
ExFreePool(Module);
return 0;
}
CHECKPOINT;
/* Adjust section vaddrs for allocated area */
Module->data_base = Module->data_base + Module->base;
Module->text_base = Module->text_base + Module->base;
Module->bss_base = Module->bss_base + Module->base;
/* Relocate module and fixup imports */
for (i = 0; i < FileHeader->f_nscns; i++)
{
if (Module->scn_list[i].s_flags & STYP_TEXT ||
Module->scn_list[i].s_flags & STYP_DATA)
{
memcpy((PVOID)(Module->base + Module->scn_list[i].s_vaddr),
(PVOID)(ModuleLoadBase + Module->scn_list[i].s_scnptr),
Module->scn_list[i].s_size);
if (!LdrCOFFDoRelocations(Module, i))
{
DbgPrint("Relocation failed for section %s\n",
Module->scn_list[i].s_name);
/* FIXME: unallocate all sections here */
ExFreePool(Module);
return 0;
}
}
if (Module->scn_list[i].s_flags & STYP_BSS)
{
memset((PVOID)(Module->base + Module->scn_list[i].s_vaddr),
0,
Module->scn_list[i].s_size);
}
}
DPRINT("Module base: %x\n", Module->base);
/* Find the entry point */
EntryOffset = 0L;
FoundEntry = FALSE;
for (i = 0; i < FileHeader->f_nsyms; i++)
{
LdrCOFFGetSymbolName(Module, i, SymbolName);
if (!strcmp(SymbolName, "_DriverEntry"))
{
EntryOffset = Module->sym_list[i].e_value;
FoundEntry = TRUE;
DPRINT("Found entry at %x\n", EntryOffset);
}
}
if (!FoundEntry)
{
DbgPrint("No module entry point defined\n");
ExFreePool(Module);
/* FIXME: unallocate all sections here */
return 0;
}
/* Get the address of the module initalization routine */
EntryRoutine = (PVOID)(Module->base + EntryOffset);
/* Create ModuleName string */
wcscpy(NameBuffer, MODULE_ROOT_NAME);
/* FIXME: someone who is interested needs to fix this. */
wcscat(NameBuffer, L"BOGUS.o");
ModuleName.Length = ModuleName.MaximumLength = wcslen(NameBuffer);
ModuleName.Buffer = NameBuffer;
DPRINT("Module name is: %w", NameBuffer);
/* Initialize ObjectAttributes for ModuleObject */
InitializeObjectAttributes(&ObjectAttributes,
&ModuleName,
0,
NULL,
NULL);
/* Create module object */
ModuleHandle = 0;
ModuleObject = ObCreateObject(&ModuleHandle,
OBJECT_TYPE_ALL_ACCESS,
&ObjectAttributes,
ObModuleType);
/* Initialize ModuleObject data */
ModuleObject->Base = (PVOID) Module->base;
ModuleObject->Flags = MODULE_FLAG_COFF;
ModuleObject->EntryPoint = (PVOID) (Module->base + EntryOffset);
DPRINT("entrypoint at %x\n", ModuleObject->EntryPoint);
/* FIXME: the COFF headers need to be copied into the module
space, and the ModuleObject needs to be set to point to them */
/* Cleanup */
ExFreePool(Module);
return ModuleObject;
}
/* LdrCOFFDoRelocations
* FUNCTION: Do the relocations for a module section
* ARGUMENTS:
* Module = Pointer to the module
* SectionIndex = Index of the section to be relocated
* RETURNS: Success or failure
*/
static BOOLEAN
LdrCOFFDoRelocations(module *Module, unsigned int SectionIndex)
{
SCNHDR *Section = &Module->scn_list[SectionIndex];
RELOC *Relocation = (RELOC *)(Module->raw_data_off + Section->s_relptr);
int j;
DPRINT("SectionIndex %d Name %.8s Relocs %d\n",
SectionIndex,
Module->scn_list[SectionIndex].s_name,
Section->s_nreloc);
for (j = 0; j < Section->s_nreloc; j++)
{
DPRINT("vaddr %x symndex %x",
Relocation->r_vaddr,
Relocation->r_symndx);
switch (Relocation->r_type)
{
case RELOC_ADDR32:
if (!LdrCOFFDoAddr32Reloc(Module, Section, Relocation))
{
return FALSE;
}
break;
case RELOC_REL32:
if (!LdrCOFFDoReloc32Reloc(Module, Section, Relocation))
{
return FALSE;
}
break;
default:
DbgPrint("%.8s: Unknown relocation type %x at %d in module\n",
Module->scn_list[SectionIndex].s_name,
Relocation->r_type,
j);
return FALSE;
}
Relocation++;
}
DPRINT("%.8s: relocations done\n", Module->scn_list[SectionIndex].s_name);
return TRUE;
}
/*
* FUNCTION: Performs a addr32 relocation on a loaded module
* ARGUMENTS:
* mod = module to perform the relocation on
* scn = Section to perform the relocation in
* reloc = Pointer to a data structure describing the relocation
* RETURNS: Success or failure
* NOTE: This fixes up a relocation needed when changing the base address of a
* module
*/
static BOOLEAN
LdrCOFFDoAddr32Reloc(module *Module, SCNHDR *Section, RELOC *Relocation)
{
unsigned int Value;
unsigned int *Location;
Value = LdrCOFFGetSymbolValue(Module, Relocation->r_symndx);
Location = (unsigned int *)(Module->base + Relocation->r_vaddr);
DPRINT("ADDR32 loc %x value %x *loc %x\n", Location, Value, *Location);
*Location = (*Location) + Module->base;
return TRUE;
}
/*
* FUNCTION: Performs a reloc32 relocation on a loaded module
* ARGUMENTS:
* mod = module to perform the relocation on
* scn = Section to perform the relocation in
* reloc = Pointer to a data structure describing the relocation
* RETURNS: Success or failure
* NOTE: This fixes up an undefined reference to a kernel function in a module
*/
static BOOLEAN
LdrCOFFDoReloc32Reloc(module *Module, SCNHDR *Section, RELOC *Relocation)
{
char Name[255];
unsigned int Value;
unsigned int *Location;
memset(Name, 0, 255);
LdrCOFFGetSymbolName(Module, Relocation->r_symndx, Name);
Value = (unsigned int) LdrGetKernelSymbolAddr(Name);
if (Value == 0L)
{
Value = LdrCOFFGetSymbolValueByName(Module, Name, Relocation->r_symndx);
if (Value == 0L)
{
DbgPrint("Undefined symbol %s in module\n", Name);
return FALSE;
}
Location = (unsigned int *)(Module->base + Relocation->r_vaddr);
// (*Location) = (*Location) + Value + Module->base - Section->s_vaddr;
(*Location) = (*Location);
DPRINT("Module->base %x Section->s_vaddr %x\n",
Module->base,
Section->s_vaddr);
}
else
{
DPRINT("REL32 value %x name %s\n", Value, Name);
Location = (unsigned int *)(Module->base + Relocation->r_vaddr);
DPRINT("old %x ", *Location);
DPRINT("Module->base %x Section->s_vaddr %x\n",
Module->base,
Section->s_vaddr);
(*Location) = (*Location) + Value - Module->base + Section->s_vaddr;
DPRINT("new %x\n", *Location);
}
return TRUE;
}
/*
* FUNCTION: Get the name of a symbol from a loaded module by ordinal
* ARGUMENTS:
* mod = module
* i = index of symbol
* name (OUT) = pointer to a string where the symbol name will be
* stored
*/
static void
LdrCOFFGetSymbolName(module *Module, unsigned int Idx, char *Name)
{
if (Module->sym_list[Idx].e.e_name[0] != 0)
{
strncpy(Name, Module->sym_list[Idx].e.e_name, 8);
Name[8] = '\0';
}
else
{
strcpy(Name, &Module->str_tab[Module->sym_list[Idx].e.e.e_offset]);
}
}
/*
* FUNCTION: Get the value of a module defined symbol
* ARGUMENTS:
* mod = module
* i = index of symbol
* RETURNS: The value of the symbol
* NOTE: This fixes up references to known sections
*/
static unsigned int
LdrCOFFGetSymbolValue(module *Module, unsigned int Idx)
{
char Name[255];
LdrCOFFGetSymbolName(Module, Idx, Name);
DPRINT("name %s ", Name);
/* Check if the symbol is a section we have relocated */
if (strcmp(Name, ".text") == 0)
{
return Module->text_base;
}
if (strcmp(Name, ".data") == 0)
{
return Module->data_base;
}
if (strcmp(Name, ".bss") == 0)
{
return Module->bss_base;
}
return Module->sym_list[Idx].e_value;
}
/*
* FUNCTION: Get the address of a kernel symbol
* ARGUMENTS:
* name = symbol name
* RETURNS: The address of the symbol on success
* NULL on failure
*/
static unsigned int
LdrGetKernelSymbolAddr(char *Name)
{
int i = 0;
char* s;
if ((s=strchr(Name,'@'))!=NULL)
{
*s=0;
DPRINT("Name %s ",Name);
}
while (symbol_table[i].name != NULL)
{
if (strcmp(symbol_table[i].name, Name) == 0)
{
if (s!=NULL)
{
*s=0;
DPRINT("Matched with %s\n",symbol_table[i].name);
}
return symbol_table[i].value;
}
i++;
}
if (s!=NULL)
{
*s=0;
}
return 0L;
}
static unsigned int
LdrCOFFGetSymbolValueByName(module *Module,
char *SymbolName,
unsigned int Idx)
{
unsigned int i;
char Name[255];
DPRINT("LdrCOFFGetSymbolValueByName(sname %s, idx %x)\n", SymbolName, Idx);
for (i = 0; i < Module->nsyms; i++)
{
LdrCOFFGetSymbolName(Module, i, Name);
DPRINT("Scanning %s Value %x\n", Name, Module->sym_list[i].e_value);
if (strcmp(Name, SymbolName) == 0)
{
DPRINT("Returning %x\n", Module->sym_list[i].e_value);
return Module->sym_list[i].e_value;
}
}
return 0L;
}
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