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reactos/dll/ntdll/ldr/ldrpe.c
Mark Jansen 24a56f89ab
Rework apisets to use a table 
This removes all fake apiset forwarders,
and handles apisets inside ntdll.
This is not 100% compatible with how windows does it, but it should be good enough for us.
2024-04-27 22:51:34 +02:00

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/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: lib/ntdll/ldr/ldrpe.c
* PURPOSE: Loader Functions dealing low-level PE Format structures
* PROGRAMMERS: Alex Ionescu (alex@relsoft.net)
*/
/* INCLUDES *****************************************************************/
#include <ntdll.h>
#define NDEBUG
#include <debug.h>
/* GLOBALS *******************************************************************/
PLDR_MANIFEST_PROBER_ROUTINE LdrpManifestProberRoutine;
ULONG LdrpNormalSnap;
/* FUNCTIONS *****************************************************************/
NTSTATUS
NTAPI
LdrpSnapIAT(IN PLDR_DATA_TABLE_ENTRY ExportLdrEntry,
IN PLDR_DATA_TABLE_ENTRY ImportLdrEntry,
IN PIMAGE_IMPORT_DESCRIPTOR IatEntry,
IN BOOLEAN EntriesValid)
{
PVOID Iat;
NTSTATUS Status;
PIMAGE_THUNK_DATA OriginalThunk, FirstThunk;
PIMAGE_NT_HEADERS NtHeader;
PIMAGE_SECTION_HEADER SectionHeader;
PIMAGE_EXPORT_DIRECTORY ExportDirectory;
LPSTR ImportName;
ULONG ForwarderChain, i, Rva, OldProtect, IatSize, ExportSize;
SIZE_T ImportSize;
DPRINT("LdrpSnapIAT(%wZ %wZ %p %u)\n", &ExportLdrEntry->BaseDllName, &ImportLdrEntry->BaseDllName, IatEntry, EntriesValid);
/* Get export directory */
ExportDirectory = RtlImageDirectoryEntryToData(ExportLdrEntry->DllBase,
TRUE,
IMAGE_DIRECTORY_ENTRY_EXPORT,
&ExportSize);
/* Make sure it has one */
if (!ExportDirectory)
{
/* Fail */
DbgPrint("LDR: %wZ doesn't contain an EXPORT table\n",
&ExportLdrEntry->BaseDllName);
return STATUS_INVALID_IMAGE_FORMAT;
}
/* Get the IAT */
Iat = RtlImageDirectoryEntryToData(ImportLdrEntry->DllBase,
TRUE,
IMAGE_DIRECTORY_ENTRY_IAT,
&IatSize);
ImportSize = IatSize;
/* Check if we don't have one */
if (!Iat)
{
/* Get the NT Header and the first section */
NtHeader = RtlImageNtHeader(ImportLdrEntry->DllBase);
if (!NtHeader) return STATUS_INVALID_IMAGE_FORMAT;
SectionHeader = IMAGE_FIRST_SECTION(NtHeader);
/* Get the RVA of the import directory */
Rva = NtHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress;
/* Make sure we got one */
if (Rva)
{
/* Loop all the sections */
for (i = 0; i < NtHeader->FileHeader.NumberOfSections; i++)
{
/* Check if we are inside this section */
if ((Rva >= SectionHeader->VirtualAddress) &&
(Rva < (SectionHeader->VirtualAddress +
SectionHeader->SizeOfRawData)))
{
/* We are, so set the IAT here */
Iat = (PVOID)((ULONG_PTR)(ImportLdrEntry->DllBase) +
SectionHeader->VirtualAddress);
/* Set the size */
IatSize = SectionHeader->Misc.VirtualSize;
/* Deal with Watcom and other retarded compilers */
if (!IatSize) IatSize = SectionHeader->SizeOfRawData;
/* Found it, get out */
break;
}
/* No match, move to the next section */
SectionHeader++;
}
}
/* If we still don't have an IAT, that's bad */
if (!Iat)
{
/* Fail */
DbgPrint("LDR: Unable to unprotect IAT for %wZ (Image Base %p)\n",
&ImportLdrEntry->BaseDllName,
ImportLdrEntry->DllBase);
return STATUS_INVALID_IMAGE_FORMAT;
}
/* Set the right size */
ImportSize = IatSize;
}
/* Unprotect the IAT */
Status = NtProtectVirtualMemory(NtCurrentProcess(),
&Iat,
&ImportSize,
PAGE_READWRITE,
&OldProtect);
if (!NT_SUCCESS(Status))
{
/* Fail */
DbgPrint("LDR: Unable to unprotect IAT for %wZ (Status %x)\n",
&ImportLdrEntry->BaseDllName,
Status);
return Status;
}
/* Check if the Thunks are already valid */
if (EntriesValid)
{
/* We'll only do forwarders. Get the import name */
ImportName = (LPSTR)((ULONG_PTR)ImportLdrEntry->DllBase + IatEntry->Name);
/* Get the list of forwarders */
ForwarderChain = IatEntry->ForwarderChain;
/* Loop them */
while (ForwarderChain != -1)
{
/* Get the cached thunk VA*/
OriginalThunk = (PIMAGE_THUNK_DATA)
((ULONG_PTR)ImportLdrEntry->DllBase +
IatEntry->OriginalFirstThunk +
(ForwarderChain * sizeof(IMAGE_THUNK_DATA)));
/* Get the first thunk */
FirstThunk = (PIMAGE_THUNK_DATA)
((ULONG_PTR)ImportLdrEntry->DllBase +
IatEntry->FirstThunk +
(ForwarderChain * sizeof(IMAGE_THUNK_DATA)));
/* Get the Forwarder from the thunk */
ForwarderChain = (ULONG)FirstThunk->u1.Ordinal;
/* Snap the thunk */
_SEH2_TRY
{
Status = LdrpSnapThunk(ExportLdrEntry->DllBase,
ImportLdrEntry->DllBase,
OriginalThunk,
FirstThunk,
ExportDirectory,
ExportSize,
TRUE,
ImportName);
/* Move to the next thunk */
FirstThunk++;
} _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
/* Fail with the SEH error */
Status = _SEH2_GetExceptionCode();
} _SEH2_END;
/* If we messed up, exit */
if (!NT_SUCCESS(Status)) break;
}
}
else if (IatEntry->FirstThunk)
{
/* Full snapping. Get the First thunk */
FirstThunk = (PIMAGE_THUNK_DATA)
((ULONG_PTR)ImportLdrEntry->DllBase +
IatEntry->FirstThunk);
/* Get the NT Header */
NtHeader = RtlImageNtHeader(ImportLdrEntry->DllBase);
/* Get the Original thunk VA, watch out for weird images */
if ((IatEntry->Characteristics < NtHeader->OptionalHeader.SizeOfHeaders) ||
(IatEntry->Characteristics >= NtHeader->OptionalHeader.SizeOfImage))
{
/* Refuse it, this is a strange linked file */
OriginalThunk = FirstThunk;
}
else
{
/* Get the address from the field and convert to VA */
OriginalThunk = (PIMAGE_THUNK_DATA)
((ULONG_PTR)ImportLdrEntry->DllBase +
IatEntry->OriginalFirstThunk);
}
/* Get the Import name VA */
ImportName = (LPSTR)((ULONG_PTR)ImportLdrEntry->DllBase +
IatEntry->Name);
/* Loop while it's valid */
while (OriginalThunk->u1.AddressOfData)
{
/* Snap the Thunk */
_SEH2_TRY
{
Status = LdrpSnapThunk(ExportLdrEntry->DllBase,
ImportLdrEntry->DllBase,
OriginalThunk,
FirstThunk,
ExportDirectory,
ExportSize,
TRUE,
ImportName);
/* Next thunks */
OriginalThunk++;
FirstThunk++;
} _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
/* Fail with the SEH error */
Status = _SEH2_GetExceptionCode();
} _SEH2_END;
/* If we failed the snap, break out */
if (!NT_SUCCESS(Status)) break;
}
}
/* Protect the IAT again */
NtProtectVirtualMemory(NtCurrentProcess(),
&Iat,
&ImportSize,
OldProtect,
&OldProtect);
/* Also flush out the cache */
NtFlushInstructionCache(NtCurrentProcess(), Iat, IatSize);
/* Return to Caller */
return Status;
}
NTSTATUS
NTAPI
LdrpHandleOneNewFormatImportDescriptor(IN LPWSTR DllPath OPTIONAL,
IN PLDR_DATA_TABLE_ENTRY LdrEntry,
IN PIMAGE_BOUND_IMPORT_DESCRIPTOR *BoundEntryPtr,
IN PIMAGE_BOUND_IMPORT_DESCRIPTOR FirstEntry)
{
LPSTR ImportName = NULL, BoundImportName, ForwarderName;
NTSTATUS Status;
BOOLEAN AlreadyLoaded = FALSE, Stale;
PIMAGE_IMPORT_DESCRIPTOR ImportEntry;
PLDR_DATA_TABLE_ENTRY DllLdrEntry, ForwarderLdrEntry;
PIMAGE_BOUND_FORWARDER_REF ForwarderEntry;
PIMAGE_BOUND_IMPORT_DESCRIPTOR BoundEntry;
PPEB Peb = NtCurrentPeb();
ULONG i, IatSize;
/* Get the pointer to the bound entry */
BoundEntry = *BoundEntryPtr;
/* Get the name's VA */
BoundImportName = (LPSTR)FirstEntry + BoundEntry->OffsetModuleName;
/* Show debug message */
if (ShowSnaps)
{
DPRINT1("LDR: %wZ bound to %s\n", &LdrEntry->BaseDllName, BoundImportName);
}
/* Load the module for this entry */
Status = LdrpLoadImportModule(DllPath,
BoundImportName,
&DllLdrEntry,
&AlreadyLoaded);
if (!NT_SUCCESS(Status))
{
/* Show debug message */
if (ShowSnaps)
{
DPRINT1("LDR: %wZ failed to load import module %s; status = %x\n",
&LdrEntry->BaseDllName,
BoundImportName,
Status);
}
goto Quickie;
}
/* Check if it wasn't already loaded */
if (!AlreadyLoaded)
{
/* Add it to our list */
InsertTailList(&Peb->Ldr->InInitializationOrderModuleList,
&DllLdrEntry->InInitializationOrderLinks);
}
/* Check if the Bound Entry is now invalid */
if ((BoundEntry->TimeDateStamp != DllLdrEntry->TimeDateStamp) ||
(DllLdrEntry->Flags & LDRP_IMAGE_NOT_AT_BASE))
{
/* Show debug message */
if (ShowSnaps)
{
DPRINT1("LDR: %wZ has stale binding to %s\n",
&LdrEntry->BaseDllName,
BoundImportName);
}
/* Remember it's become stale */
Stale = TRUE;
}
else
{
/* Show debug message */
if (ShowSnaps)
{
DPRINT1("LDR: %wZ has correct binding to %s\n",
&LdrEntry->BaseDllName,
BoundImportName);
}
/* Remember it's valid */
Stale = FALSE;
}
/* Get the forwarders */
ForwarderEntry = (PIMAGE_BOUND_FORWARDER_REF)(BoundEntry + 1);
/* Loop them */
for (i = 0; i < BoundEntry->NumberOfModuleForwarderRefs; i++)
{
/* Get the name */
ForwarderName = (LPSTR)FirstEntry + ForwarderEntry->OffsetModuleName;
/* Show debug message */
if (ShowSnaps)
{
DPRINT1("LDR: %wZ bound to %s via forwarder(s) from %wZ\n",
&LdrEntry->BaseDllName,
ForwarderName,
&DllLdrEntry->BaseDllName);
}
/* Load the module */
Status = LdrpLoadImportModule(DllPath,
ForwarderName,
&ForwarderLdrEntry,
&AlreadyLoaded);
if (NT_SUCCESS(Status))
{
/* Loaded it, was it already loaded? */
if (!AlreadyLoaded)
{
/* Add it to our list */
InsertTailList(&Peb->Ldr->InInitializationOrderModuleList,
&ForwarderLdrEntry->InInitializationOrderLinks);
}
}
/* Check if the Bound Entry is now invalid */
if (!(NT_SUCCESS(Status)) ||
(ForwarderEntry->TimeDateStamp != ForwarderLdrEntry->TimeDateStamp) ||
(ForwarderLdrEntry->Flags & LDRP_IMAGE_NOT_AT_BASE))
{
/* Show debug message */
if (ShowSnaps)
{
DPRINT1("LDR: %wZ has stale binding to %s\n",
&LdrEntry->BaseDllName,
ForwarderName);
}
/* Remember it's become stale */
Stale = TRUE;
}
else
{
/* Show debug message */
if (ShowSnaps)
{
DPRINT1("LDR: %wZ has correct binding to %s\n",
&LdrEntry->BaseDllName,
ForwarderName);
}
/* Remember it's valid */
Stale = FALSE;
}
/* Move to the next one */
ForwarderEntry++;
}
/* Set the next bound entry to the forwarder */
FirstEntry = (PIMAGE_BOUND_IMPORT_DESCRIPTOR)ForwarderEntry;
/* Check if the binding was stale */
if (Stale)
{
/* It was, so find the IAT entry for it */
++LdrpNormalSnap;
ImportEntry = RtlImageDirectoryEntryToData(LdrEntry->DllBase,
TRUE,
IMAGE_DIRECTORY_ENTRY_IMPORT,
&IatSize);
/* Make sure it has a name */
while (ImportEntry->Name)
{
/* Get the name */
ImportName = (LPSTR)((ULONG_PTR)LdrEntry->DllBase + ImportEntry->Name);
/* Compare it */
if (!_stricmp(ImportName, BoundImportName)) break;
/* Move to next entry */
ImportEntry++;
}
/* If we didn't find a name, fail */
if (!ImportEntry->Name)
{
/* Show debug message */
if (ShowSnaps)
{
DPRINT1("LDR: LdrpWalkImportTable - failing with"
"STATUS_OBJECT_NAME_INVALID due to no import descriptor name\n");
}
/* Return error */
Status = STATUS_OBJECT_NAME_INVALID;
goto Quickie;
}
/* Show debug message */
if (ShowSnaps)
{
DPRINT1("LDR: Stale Bind %s from %wZ\n",
ImportName,
&LdrEntry->BaseDllName);
}
/* Snap the IAT Entry*/
Status = LdrpSnapIAT(DllLdrEntry,
LdrEntry,
ImportEntry,
FALSE);
/* Make sure we didn't fail */
if (!NT_SUCCESS(Status))
{
/* Show debug message */
if (ShowSnaps)
{
DPRINT1("LDR: %wZ failed to load import module %s; status = %x\n",
&LdrEntry->BaseDllName,
BoundImportName,
Status);
}
/* Return */
goto Quickie;
}
}
/* All done */
Status = STATUS_SUCCESS;
Quickie:
/* Write where we are now and return */
*BoundEntryPtr = FirstEntry;
return Status;
}
NTSTATUS
NTAPI
LdrpHandleNewFormatImportDescriptors(IN LPWSTR DllPath OPTIONAL,
IN PLDR_DATA_TABLE_ENTRY LdrEntry,
IN PIMAGE_BOUND_IMPORT_DESCRIPTOR BoundEntry)
{
PIMAGE_BOUND_IMPORT_DESCRIPTOR FirstEntry = BoundEntry;
NTSTATUS Status;
/* Make sure we have a name */
while (BoundEntry->OffsetModuleName)
{
/* Parse this descriptor */
Status = LdrpHandleOneNewFormatImportDescriptor(DllPath,
LdrEntry,
&BoundEntry,
FirstEntry);
if (!NT_SUCCESS(Status)) return Status;
}
/* Done */
return STATUS_SUCCESS;
}
NTSTATUS
NTAPI
LdrpHandleOneOldFormatImportDescriptor(IN LPWSTR DllPath OPTIONAL,
IN PLDR_DATA_TABLE_ENTRY LdrEntry,
IN PIMAGE_IMPORT_DESCRIPTOR *ImportEntry)
{
LPSTR ImportName;
NTSTATUS Status;
BOOLEAN AlreadyLoaded = FALSE;
PLDR_DATA_TABLE_ENTRY DllLdrEntry;
PIMAGE_THUNK_DATA FirstThunk;
PPEB Peb = NtCurrentPeb();
/* Get the import name's VA */
ImportName = (LPSTR)((ULONG_PTR)LdrEntry->DllBase + (*ImportEntry)->Name);
/* Get the first thunk */
FirstThunk = (PIMAGE_THUNK_DATA)((ULONG_PTR)LdrEntry->DllBase +
(*ImportEntry)->FirstThunk);
/* Make sure it's valid */
if (!FirstThunk->u1.Function) goto SkipEntry;
/* Show debug message */
if (ShowSnaps)
{
DPRINT1("LDR: %s used by %wZ\n",
ImportName,
&LdrEntry->BaseDllName);
}
/* Load the module associated to it */
Status = LdrpLoadImportModule(DllPath,
ImportName,
&DllLdrEntry,
&AlreadyLoaded);
if (!NT_SUCCESS(Status))
{
/* Fail */
if (ShowSnaps)
{
DbgPrint("LDR: LdrpWalkImportTable - LdrpLoadImportModule failed "
"on import %s with status %x\n",
ImportName,
Status);
}
/* Return */
return Status;
}
/* Show debug message */
if (ShowSnaps)
{
DPRINT1("LDR: Snapping imports for %wZ from %s\n",
&LdrEntry->BaseDllName,
ImportName);
}
/* Check if it wasn't already loaded */
++LdrpNormalSnap;
if (!AlreadyLoaded)
{
/* Add the DLL to our list */
InsertTailList(&Peb->Ldr->InInitializationOrderModuleList,
&DllLdrEntry->InInitializationOrderLinks);
}
/* Now snap the IAT Entry */
Status = LdrpSnapIAT(DllLdrEntry, LdrEntry, *ImportEntry, FALSE);
if (!NT_SUCCESS(Status))
{
/* Fail */
if (ShowSnaps)
{
DbgPrint("LDR: LdrpWalkImportTable - LdrpSnapIAT #2 failed with "
"status %x\n",
Status);
}
/* Return */
return Status;
}
SkipEntry:
/* Move on */
(*ImportEntry)++;
return STATUS_SUCCESS;
}
NTSTATUS
NTAPI
LdrpHandleOldFormatImportDescriptors(IN LPWSTR DllPath OPTIONAL,
IN PLDR_DATA_TABLE_ENTRY LdrEntry,
IN PIMAGE_IMPORT_DESCRIPTOR ImportEntry)
{
NTSTATUS Status;
/* Check for Name and Thunk */
while ((ImportEntry->Name) && (ImportEntry->FirstThunk))
{
/* Parse this descriptor */
Status = LdrpHandleOneOldFormatImportDescriptor(DllPath,
LdrEntry,
&ImportEntry);
if (!NT_SUCCESS(Status)) return Status;
}
/* Done */
return STATUS_SUCCESS;
}
USHORT
NTAPI
LdrpNameToOrdinal(IN LPSTR ImportName,
IN ULONG NumberOfNames,
IN PVOID ExportBase,
IN PULONG NameTable,
IN PUSHORT OrdinalTable)
{
LONG Start, End, Next, CmpResult;
/* Use classical binary search to find the ordinal */
Start = Next = 0;
End = NumberOfNames - 1;
while (End >= Start)
{
/* Next will be exactly between Start and End */
Next = (Start + End) >> 1;
/* Compare this name with the one we need to find */
CmpResult = strcmp(ImportName, (PCHAR)((ULONG_PTR)ExportBase + NameTable[Next]));
/* We found our entry if result is 0 */
if (!CmpResult) break;
/* We didn't find, update our range then */
if (CmpResult < 0)
{
End = Next - 1;
}
else if (CmpResult > 0)
{
Start = Next + 1;
}
}
/* If end is before start, then the search failed */
if (End < Start) return -1;
/* Return found name */
return OrdinalTable[Next];
}
NTSTATUS
NTAPI
LdrpWalkImportDescriptor(IN LPWSTR DllPath OPTIONAL,
IN PLDR_DATA_TABLE_ENTRY LdrEntry)
{
RTL_CALLER_ALLOCATED_ACTIVATION_CONTEXT_STACK_FRAME_EXTENDED ActCtx;
PPEB Peb = NtCurrentPeb();
NTSTATUS Status = STATUS_SUCCESS, Status2;
PIMAGE_BOUND_IMPORT_DESCRIPTOR BoundEntry = NULL;
PIMAGE_IMPORT_DESCRIPTOR ImportEntry;
ULONG BoundSize, IatSize;
DPRINT("LdrpWalkImportDescriptor - BEGIN (%wZ %p '%S')\n", &LdrEntry->BaseDllName, LdrEntry, DllPath);
/* Set up the Act Ctx */
RtlZeroMemory(&ActCtx, sizeof(ActCtx));
ActCtx.Size = sizeof(ActCtx);
ActCtx.Format = RTL_CALLER_ALLOCATED_ACTIVATION_CONTEXT_STACK_FRAME_FORMAT_WHISTLER;
/* Check if we have a manifest prober routine */
if (LdrpManifestProberRoutine)
{
/* Probe the DLL for its manifest. Some details are omitted */
Status2 = LdrpManifestProberRoutine(LdrEntry->DllBase, LdrEntry->FullDllName.Buffer, &LdrEntry->EntryPointActivationContext);
if (!NT_SUCCESS(Status2) &&
Status2 != STATUS_NO_SUCH_FILE &&
Status2 != STATUS_RESOURCE_DATA_NOT_FOUND &&
Status2 != STATUS_RESOURCE_TYPE_NOT_FOUND &&
Status2 != STATUS_RESOURCE_NAME_NOT_FOUND &&
Status2 != STATUS_RESOURCE_LANG_NOT_FOUND)
{
/* Some serious issue */
//Status = Status2; // FIXME: Ignore that error for now
DbgPrintEx(DPFLTR_SXS_ID,
DPFLTR_WARNING_LEVEL,
"LDR: LdrpWalkImportDescriptor() failed to probe %wZ for its "
"manifest, ntstatus = 0x%08lx\n",
&LdrEntry->FullDllName, Status2);
}
}
/* Check if we failed above */
if (!NT_SUCCESS(Status)) return Status;
/* Get the Active ActCtx */
if (!LdrEntry->EntryPointActivationContext)
{
Status = RtlGetActiveActivationContext(&LdrEntry->EntryPointActivationContext);
if (!NT_SUCCESS(Status))
{
/* Exit */
DbgPrintEx(DPFLTR_SXS_ID,
DPFLTR_WARNING_LEVEL,
"LDR: RtlGetActiveActivationContext() failed; ntstatus = "
"0x%08lx\n",
Status);
return Status;
}
}
/* Activate the ActCtx */
RtlActivateActivationContextUnsafeFast(&ActCtx,
LdrEntry->EntryPointActivationContext);
/* Check if we were redirected */
if (!(LdrEntry->Flags & LDRP_REDIRECTED))
{
/* Get the Bound IAT */
BoundEntry = RtlImageDirectoryEntryToData(LdrEntry->DllBase,
TRUE,
IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT,
&BoundSize);
}
/* Get the regular IAT, for fallback */
ImportEntry = RtlImageDirectoryEntryToData(LdrEntry->DllBase,
TRUE,
IMAGE_DIRECTORY_ENTRY_IMPORT,
&IatSize);
/* Check if we got at least one */
if ((BoundEntry) || (ImportEntry))
{
/* Do we have a Bound IAT */
if (BoundEntry)
{
/* Handle the descriptor */
Status = LdrpHandleNewFormatImportDescriptors(DllPath,
LdrEntry,
BoundEntry);
}
else
{
/* Handle the descriptor */
Status = LdrpHandleOldFormatImportDescriptors(DllPath,
LdrEntry,
ImportEntry);
}
/* Check the status of the handlers */
if (NT_SUCCESS(Status))
{
/* Check for Per-DLL Heap Tagging */
if (Peb->NtGlobalFlag & FLG_HEAP_ENABLE_TAG_BY_DLL)
{
/* FIXME */
DPRINT1("We don't support Per-DLL Heap Tagging yet!\n");
}
/* Check if Page Heap was enabled */
if (Peb->NtGlobalFlag & FLG_HEAP_PAGE_ALLOCS)
{
/* Initialize target DLL */
AVrfPageHeapDllNotification(LdrEntry);
}
/* Check if Application Verifier was enabled */
if (Peb->NtGlobalFlag & FLG_APPLICATION_VERIFIER)
{
AVrfDllLoadNotification(LdrEntry);
}
/* Just to be safe */
Status = STATUS_SUCCESS;
}
}
/* Release the activation context */
RtlDeactivateActivationContextUnsafeFast(&ActCtx);
DPRINT("LdrpWalkImportDescriptor - END (%wZ %p)\n", &LdrEntry->BaseDllName, LdrEntry);
/* Return status */
return Status;
}
NTSTATUS
NTAPI
LdrpLoadImportModule(IN PWSTR DllPath OPTIONAL,
IN LPSTR ImportName,
OUT PLDR_DATA_TABLE_ENTRY *DataTableEntry,
OUT PBOOLEAN Existing)
{
ANSI_STRING AnsiString;
PUNICODE_STRING ImpDescName;
const WCHAR *p;
BOOLEAN GotExtension;
WCHAR c;
NTSTATUS Status;
PPEB Peb = RtlGetCurrentPeb();
PTEB Teb = NtCurrentTeb();
UNICODE_STRING RedirectedImpDescName;
BOOLEAN RedirectedDll;
DPRINT("LdrpLoadImportModule('%S' '%s' %p %p)\n", DllPath, ImportName, DataTableEntry, Existing);
RedirectedDll = FALSE;
RtlInitEmptyUnicodeString(&RedirectedImpDescName, NULL, 0);
/* Convert import descriptor name to unicode string */
ImpDescName = &Teb->StaticUnicodeString;
RtlInitAnsiString(&AnsiString, ImportName);
Status = RtlAnsiStringToUnicodeString(ImpDescName, &AnsiString, FALSE);
if (!NT_SUCCESS(Status)) return Status;
/* Find the extension, if present */
p = ImpDescName->Buffer + ImpDescName->Length / sizeof(WCHAR) - 1;
GotExtension = FALSE;
while (p >= ImpDescName->Buffer)
{
c = *p--;
if (c == L'.')
{
GotExtension = TRUE;
break;
}
else if (c == L'\\')
{
break;
}
}
/* If no extension was found, add the default extension */
if (!GotExtension)
{
/* Check that we have space to add one */
if ((ImpDescName->Length + LdrApiDefaultExtension.Length + sizeof(UNICODE_NULL)) >=
sizeof(Teb->StaticUnicodeBuffer))
{
/* No space to add the extension */
DbgPrintEx(DPFLTR_LDR_ID,
DPFLTR_ERROR_LEVEL,
"LDR: %s - Dll name missing extension; with extension "
"added the name is too long\n"
" ImpDescName: (@ %p) \"%wZ\"\n"
" ImpDescName->Length: %u\n",
__FUNCTION__,
ImpDescName,
ImpDescName,
ImpDescName->Length);
return STATUS_NAME_TOO_LONG;
}
/* Add it. Needs to be null terminated, thus the length check above */
(VOID)RtlAppendUnicodeStringToString(ImpDescName,
&LdrApiDefaultExtension);
}
/* Check if the SxS Assemblies specify another file */
Status = LdrpApplyFileNameRedirection(
ImpDescName, &LdrApiDefaultExtension, NULL, &RedirectedImpDescName, &ImpDescName, &RedirectedDll);
if (!NT_SUCCESS(Status))
{
/* Unrecoverable SxS failure */
DPRINT1("LDR: LdrpApplyFileNameRedirection failed with status %x for dll %wZ\n", Status, ImpDescName);
goto done;
}
/* Check if it's loaded */
if (LdrpCheckForLoadedDll(DllPath,
ImpDescName,
TRUE,
RedirectedDll,
DataTableEntry))
{
/* It's already existing in the list */
*Existing = TRUE;
Status = STATUS_SUCCESS;
goto done;
}
/* We're loading it for the first time */
*Existing = FALSE;
/* Map it */
Status = LdrpMapDll(DllPath,
NULL,
ImpDescName->Buffer,
NULL,
TRUE,
RedirectedDll,
DataTableEntry);
if (!NT_SUCCESS(Status))
{
DPRINT1("LDR: LdrpMapDll failed with status %x for dll %wZ\n", Status, ImpDescName);
goto done;
}
/* Walk its import descriptor table */
Status = LdrpWalkImportDescriptor(DllPath,
*DataTableEntry);
if (!NT_SUCCESS(Status))
{
/* Add it to the in-init-order list in case of failure */
InsertTailList(&Peb->Ldr->InInitializationOrderModuleList,
&(*DataTableEntry)->InInitializationOrderLinks);
}
done:
RtlFreeUnicodeString(&RedirectedImpDescName);
return Status;
}
NTSTATUS
NTAPI
LdrpSnapThunk(IN PVOID ExportBase,
IN PVOID ImportBase,
IN PIMAGE_THUNK_DATA OriginalThunk,
IN OUT PIMAGE_THUNK_DATA Thunk,
IN PIMAGE_EXPORT_DIRECTORY ExportDirectory,
IN ULONG ExportSize,
IN BOOLEAN Static,
IN LPSTR DllName)
{
BOOLEAN IsOrdinal;
USHORT Ordinal;
ULONG OriginalOrdinal = 0;
PIMAGE_IMPORT_BY_NAME AddressOfData;
PULONG NameTable;
PUSHORT OrdinalTable;
LPSTR ImportName = NULL, DotPosition;
USHORT Hint;
NTSTATUS Status;
ULONG_PTR HardErrorParameters[3];
UNICODE_STRING HardErrorDllName, HardErrorEntryPointName;
ANSI_STRING TempString;
ULONG Mask;
ULONG Response;
PULONG AddressOfFunctions;
UNICODE_STRING TempUString;
ANSI_STRING ForwarderName;
PANSI_STRING ForwardName;
PVOID ForwarderHandle;
ULONG ForwardOrdinal;
/* Check if the snap is by ordinal */
if ((IsOrdinal = IMAGE_SNAP_BY_ORDINAL(OriginalThunk->u1.Ordinal)))
{
/* Get the ordinal number, and its normalized version */
OriginalOrdinal = IMAGE_ORDINAL(OriginalThunk->u1.Ordinal);
Ordinal = (USHORT)(OriginalOrdinal - ExportDirectory->Base);
}
else
{
/* First get the data VA */
AddressOfData = (PIMAGE_IMPORT_BY_NAME)
((ULONG_PTR)ImportBase +
((ULONG_PTR)OriginalThunk->u1.AddressOfData & 0xffffffff));
/* Get the name */
ImportName = (LPSTR)AddressOfData->Name;
/* Now get the VA of the Name and Ordinal Tables */
NameTable = (PULONG)((ULONG_PTR)ExportBase +
(ULONG_PTR)ExportDirectory->AddressOfNames);
OrdinalTable = (PUSHORT)((ULONG_PTR)ExportBase +
(ULONG_PTR)ExportDirectory->AddressOfNameOrdinals);
/* Get the hint */
Hint = AddressOfData->Hint;
/* Try to get a match by using the hint */
if (((ULONG)Hint < ExportDirectory->NumberOfNames) &&
(!strcmp(ImportName, ((LPSTR)((ULONG_PTR)ExportBase + NameTable[Hint])))))
{
/* We got a match, get the Ordinal from the hint */
Ordinal = OrdinalTable[Hint];
}
else
{
/* Well bummer, hint didn't work, do it the long way */
Ordinal = LdrpNameToOrdinal(ImportName,
ExportDirectory->NumberOfNames,
ExportBase,
NameTable,
OrdinalTable);
}
}
/* Check if the ordinal is invalid */
if ((ULONG)Ordinal >= ExportDirectory->NumberOfFunctions)
{
FailurePath:
/* Is this a static snap? */
if (Static)
{
UNICODE_STRING SnapTarget;
PLDR_DATA_TABLE_ENTRY LdrEntry;
/* What was the module we were searching in */
RtlInitAnsiString(&TempString, DllName ? DllName : "Unknown");
/* What was the module we were searching for */
if (LdrpCheckForLoadedDllHandle(ImportBase, &LdrEntry))
SnapTarget = LdrEntry->BaseDllName;
else
RtlInitUnicodeString(&SnapTarget, L"Unknown");
/* Inform the debug log */
if (IsOrdinal)
DPRINT1("Failed to snap ordinal %Z!0x%x for %wZ\n", &TempString, OriginalOrdinal, &SnapTarget);
else
DPRINT1("Failed to snap %Z!%s for %wZ\n", &TempString, ImportName, &SnapTarget);
/* These are critical errors. Setup a string for the DLL name */
RtlAnsiStringToUnicodeString(&HardErrorDllName, &TempString, TRUE);
/* Set it as the parameter */
HardErrorParameters[1] = (ULONG_PTR)&HardErrorDllName;
Mask = 2;
/* Check if we have an ordinal */
if (IsOrdinal)
{
/* Then set the ordinal as the 1st parameter */
HardErrorParameters[0] = OriginalOrdinal;
}
else
{
/* We don't, use the entrypoint. Set up a string for it */
RtlInitAnsiString(&TempString, ImportName);
RtlAnsiStringToUnicodeString(&HardErrorEntryPointName,
&TempString,
TRUE);
/* Set it as the parameter */
HardErrorParameters[0] = (ULONG_PTR)&HardErrorEntryPointName;
Mask = 3;
}
/* Raise the error */
NtRaiseHardError(IsOrdinal ? STATUS_ORDINAL_NOT_FOUND :
STATUS_ENTRYPOINT_NOT_FOUND,
2,
Mask,
HardErrorParameters,
OptionOk,
&Response);
/* Increase the error count */
if (LdrpInLdrInit) LdrpFatalHardErrorCount++;
/* Free our string */
RtlFreeUnicodeString(&HardErrorDllName);
if (!IsOrdinal)
{
/* Free our second string. Return entrypoint error */
RtlFreeUnicodeString(&HardErrorEntryPointName);
RtlRaiseStatus(STATUS_ENTRYPOINT_NOT_FOUND);
}
/* Return ordinal error */
RtlRaiseStatus(STATUS_ORDINAL_NOT_FOUND);
}
else
{
/* Inform the debug log */
if (IsOrdinal)
DPRINT("Non-fatal: Failed to snap ordinal 0x%x\n", OriginalOrdinal);
else
DPRINT("Non-fatal: Failed to snap %s\n", ImportName);
}
/* Set this as a bad DLL */
Thunk->u1.Function = (ULONG_PTR)0xffbadd11;
/* Return the right error code */
Status = IsOrdinal ? STATUS_ORDINAL_NOT_FOUND :
STATUS_ENTRYPOINT_NOT_FOUND;
}
else
{
/* The ordinal seems correct, get the AddressOfFunctions VA */
AddressOfFunctions = (PULONG)
((ULONG_PTR)ExportBase +
(ULONG_PTR)ExportDirectory->AddressOfFunctions);
/* Write the function pointer*/
Thunk->u1.Function = (ULONG_PTR)ExportBase + AddressOfFunctions[Ordinal];
/* Make sure it's within the exports */
if ((Thunk->u1.Function > (ULONG_PTR)ExportDirectory) &&
(Thunk->u1.Function < ((ULONG_PTR)ExportDirectory + ExportSize)))
{
/* Get the Import and Forwarder Names */
ImportName = (LPSTR)Thunk->u1.Function;
DotPosition = strchr(ImportName, '.');
ASSERT(DotPosition != NULL);
if (!DotPosition)
goto FailurePath;
ForwarderName.Buffer = ImportName;
ForwarderName.Length = (USHORT)(DotPosition - ImportName);
ForwarderName.MaximumLength = ForwarderName.Length;
Status = RtlAnsiStringToUnicodeString(&TempUString,
&ForwarderName,
TRUE);
/* Make sure the conversion was OK */
if (NT_SUCCESS(Status))
{
WCHAR StringBuffer[MAX_PATH];
UNICODE_STRING StaticString, *RedirectedImportName;
BOOLEAN Redirected = FALSE;
RtlInitEmptyUnicodeString(&StaticString, StringBuffer, sizeof(StringBuffer));
/* Check if the SxS Assemblies specify another file */
Status = LdrpApplyFileNameRedirection(
&TempUString, &LdrApiDefaultExtension, &StaticString, NULL, &RedirectedImportName, &Redirected);
if (NT_SUCCESS(Status) && Redirected)
{
if (ShowSnaps)
DPRINT1("LDR: %Z got redirected to %wZ\n", &ForwarderName, RedirectedImportName);
}
else
{
RedirectedImportName = &TempUString;
}
/* Load the forwarder */
Status = LdrpLoadDll(Redirected,
NULL,
NULL,
RedirectedImportName,
&ForwarderHandle,
FALSE);
RtlFreeUnicodeString(&TempUString);
}
/* If the load or conversion failed, use the failure path */
if (!NT_SUCCESS(Status)) goto FailurePath;
/* Now set up a name for the actual forwarder dll */
RtlInitAnsiString(&ForwarderName,
ImportName + ForwarderName.Length + sizeof(CHAR));
/* Check if it's an ordinal forward */
if ((ForwarderName.Length > 1) && (*ForwarderName.Buffer == '#'))
{
/* We don't have an actual function name */
ForwardName = NULL;
/* Convert the string into an ordinal */
Status = RtlCharToInteger(ForwarderName.Buffer + sizeof(CHAR),
0,
&ForwardOrdinal);
/* If this fails, then error out */
if (!NT_SUCCESS(Status)) goto FailurePath;
}
else
{
/* Import by name */
ForwardName = &ForwarderName;
ForwardOrdinal = 0;
}
/* Get the pointer */
Status = LdrpGetProcedureAddress(ForwarderHandle,
ForwardName,
ForwardOrdinal,
(PVOID*)&Thunk->u1.Function,
FALSE);
/* If this fails, then error out */
if (!NT_SUCCESS(Status)) goto FailurePath;
}
else
{
/* It's not within the exports, let's hope it's valid */
if (!AddressOfFunctions[Ordinal]) goto FailurePath;
}
/* If we got here, then it's success */
Status = STATUS_SUCCESS;
}
/* Return status */
return Status;
}
/* EOF */
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