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[LDR] Overhaul sxs support in ldr

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* Remove the hacky find_actctx_dll form ldr that was taken from wine. LdrpResolveDllName and LdrpCheckForLoadedDll should get a parameter that is already redirected.
* Use RtlDosApplyFileIsolationRedirection_Ustr in LdrpLoadImportModule and LdrpUpdateLoadCount3 to redirerect the input parameter.
This commit is contained in:
Giannis Adamopoulos 2017-10-03 22:11:47 +03:00
parent 7000fe2340
commit f318a25e10
2 changed files with 293 additions and 282 deletions
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92
dll/ntdll/ldr/ldrpe.c
View file

@ -815,7 +815,6 @@ LdrpWalkImportDescriptor(IN LPWSTR DllPath OPTIONAL,
return Status;
}
/* FIXME: This function is missing SxS support */
NTSTATUS
NTAPI
LdrpLoadImportModule(IN PWSTR DllPath OPTIONAL,
@ -831,9 +830,14 @@ LdrpLoadImportModule(IN PWSTR DllPath OPTIONAL,
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);
@ -883,76 +887,59 @@ LdrpLoadImportModule(IN PWSTR DllPath OPTIONAL,
&LdrApiDefaultExtension);
}
/* Check if the SxS Assemblies specify another file */
Status = RtlDosApplyFileIsolationRedirection_Ustr(TRUE,
ImpDescName,
&LdrApiDefaultExtension,
NULL,
&RedirectedImpDescName,
&ImpDescName,
NULL,
NULL,
NULL);
/* Check success */
if (NT_SUCCESS(Status))
{
/* Let Ldrp know */
RedirectedDll = TRUE;
}
else if (Status != STATUS_SXS_KEY_NOT_FOUND)
{
/* Unrecoverable SxS failure */
DPRINT1("LDR: RtlDosApplyFileIsolationRedirection_Ustr failed with status %x for dll %wZ\n", Status, ImpDescName);
goto done;
}
/* Check if it's loaded */
if (LdrpCheckForLoadedDll(DllPath,
ImpDescName,
TRUE,
FALSE,
RedirectedDll,
DataTableEntry))
{
/* It's already existing in the list */
*Existing = TRUE;
return STATUS_SUCCESS;
Status = STATUS_SUCCESS;
goto done;
}
/* We're loading it for the first time */
*Existing = FALSE;
#if 0
/* Load manifest */
{
ACTCTX_SECTION_KEYED_DATA data;
NTSTATUS status;
//DPRINT1("find_actctx_dll for %S\n", fullname);
//RtlInitUnicodeString(&nameW, libname);
data.cbSize = sizeof(data);
status = RtlFindActivationContextSectionString(
FIND_ACTCTX_SECTION_KEY_RETURN_HACTCTX, NULL,
ACTIVATION_CONTEXT_SECTION_DLL_REDIRECTION,
ImpDescName,
&data);
//if (status != STATUS_SUCCESS) return status;
DPRINT1("Status: 0x%08X\n", status);
if (NT_SUCCESS(status))
{
ACTIVATION_CONTEXT_ASSEMBLY_DETAILED_INFORMATION *info;
SIZE_T needed, size = 1024;
for (;;)
{
if (!(info = RtlAllocateHeap(RtlGetProcessHeap(), 0, size)))
{
status = STATUS_NO_MEMORY;
goto done;
}
status = RtlQueryInformationActivationContext(0, data.hActCtx, &data.ulAssemblyRosterIndex,
AssemblyDetailedInformationInActivationContext,
info, size, &needed);
if (status == STATUS_SUCCESS) break;
if (status != STATUS_BUFFER_TOO_SMALL) goto done;
RtlFreeHeap(RtlGetProcessHeap(), 0, info);
size = needed;
}
DPRINT("manifestpath === %S\n", info->lpAssemblyManifestPath);
DPRINT("DirectoryName === %S\n", info->lpAssemblyDirectoryName);
}
}
done:
#endif
/* Map it */
Status = LdrpMapDll(DllPath,
NULL,
ImpDescName->Buffer,
NULL,
TRUE,
FALSE,
RedirectedDll,
DataTableEntry);
if (!NT_SUCCESS(Status)) return Status;
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,
@ -964,6 +951,9 @@ done:
&(*DataTableEntry)->InInitializationOrderLinks);
}
done:
RtlFreeUnicodeString(&RedirectedImpDescName);
return Status;
}

483
dll/ntdll/ldr/ldrutils.c
View file

@ -28,101 +28,6 @@ PVOID g_pfnSE_ProcessDying;
/* FUNCTIONS *****************************************************************/
/* NOTE: Remove this one once our actctx support becomes better */
NTSTATUS find_actctx_dll( LPCWSTR libname, WCHAR *fullname )
{
static const WCHAR winsxsW[] = {'\\','w','i','n','s','x','s','\\'};
static const WCHAR dotManifestW[] = {'.','m','a','n','i','f','e','s','t',0};
ACTIVATION_CONTEXT_ASSEMBLY_DETAILED_INFORMATION *info;
ACTCTX_SECTION_KEYED_DATA data;
UNICODE_STRING nameW;
NTSTATUS status;
SIZE_T needed, size = 1024;
WCHAR *p;
RtlInitUnicodeString( &nameW, libname );
data.cbSize = sizeof(data);
status = RtlFindActivationContextSectionString( FIND_ACTCTX_SECTION_KEY_RETURN_HACTCTX, NULL,
ACTIVATION_CONTEXT_SECTION_DLL_REDIRECTION,
&nameW, &data );
if (status != STATUS_SUCCESS) return status;
for (;;)
{
if (!(info = RtlAllocateHeap( RtlGetProcessHeap(), 0, size )))
{
status = STATUS_NO_MEMORY;
goto done;
}
status = RtlQueryInformationActivationContext( 0, data.hActCtx, &data.ulAssemblyRosterIndex,
AssemblyDetailedInformationInActivationContext,
info, size, &needed );
if (status == STATUS_SUCCESS) break;
if (status != STATUS_BUFFER_TOO_SMALL) goto done;
RtlFreeHeap( RtlGetProcessHeap(), 0, info );
size = needed;
}
DPRINT("manifestpath === %S\n", info->lpAssemblyManifestPath);
DPRINT("DirectoryName === %S\n", info->lpAssemblyDirectoryName);
if (!info->lpAssemblyManifestPath || !info->lpAssemblyDirectoryName)
{
status = STATUS_SXS_KEY_NOT_FOUND;
goto done;
}
if ((p = wcsrchr( info->lpAssemblyManifestPath, '\\' )))
{
DWORD dirlen = info->ulAssemblyDirectoryNameLength / sizeof(WCHAR);
p++;
if (_wcsnicmp( p, info->lpAssemblyDirectoryName, dirlen ) || wcsicmp( p + dirlen, dotManifestW ))
{
/* manifest name does not match directory name, so it's not a global
* windows/winsxs manifest; use the manifest directory name instead */
dirlen = p - info->lpAssemblyManifestPath;
needed = (dirlen + 1) * sizeof(WCHAR) + nameW.Length;
p = fullname;
/*if (!(*fullname = p = RtlAllocateHeap( GetProcessHeap(), 0, needed )))
{
status = STATUS_NO_MEMORY;
goto done;
}*/
memcpy( p, info->lpAssemblyManifestPath, dirlen * sizeof(WCHAR) );
p += dirlen;
wcscpy( p, libname );
goto done;
}
}
needed = (wcslen(SharedUserData->NtSystemRoot) * sizeof(WCHAR) +
sizeof(winsxsW) + info->ulAssemblyDirectoryNameLength + nameW.Length + 2*sizeof(WCHAR));
p = fullname;
//if (!(*fullname = p = RtlAllocateHeap( GetProcessHeap(), 0, needed )))
//{
//status = STATUS_NO_MEMORY;
//goto done;
//}
wcscpy( p, SharedUserData->NtSystemRoot );
p += wcslen(p);
memcpy( p, winsxsW, sizeof(winsxsW) );
p += sizeof(winsxsW) / sizeof(WCHAR);
memcpy( p, info->lpAssemblyDirectoryName, info->ulAssemblyDirectoryNameLength );
p += info->ulAssemblyDirectoryNameLength / sizeof(WCHAR);
*p++ = '\\';
wcscpy( p, libname );
done:
RtlFreeHeap( RtlGetProcessHeap(), 0, info );
RtlReleaseActivationContext( data.hActCtx );
DPRINT("%S\n", fullname);
return status;
}
NTSTATUS
NTAPI
LdrpAllocateUnicodeString(IN OUT PUNICODE_STRING StringOut,
@ -214,19 +119,30 @@ LdrpUpdateLoadCount3(IN PLDR_DATA_TABLE_ENTRY LdrEntry,
PIMAGE_IMPORT_DESCRIPTOR ImportEntry;
PIMAGE_THUNK_DATA FirstThunk;
PLDR_DATA_TABLE_ENTRY Entry;
PUNICODE_STRING ImportNameUnic;
PUNICODE_STRING ImportNameUnic, RedirectedImportName;
ANSI_STRING ImportNameAnsi;
LPSTR ImportName;
ULONG ImportSize;
NTSTATUS Status;
ULONG i;
BOOLEAN RedirectedDll;
RTL_CALLER_ALLOCATED_ACTIVATION_CONTEXT_STACK_FRAME_EXTENDED ActCtx;
/* Set up the Act Ctx */
ActCtx.Size = sizeof(ActCtx);
ActCtx.Format = RTL_CALLER_ALLOCATED_ACTIVATION_CONTEXT_STACK_FRAME_FORMAT_WHISTLER;
RtlZeroMemory(&ActCtx.Frame, sizeof(RTL_ACTIVATION_CONTEXT_STACK_FRAME));
/* Activate the ActCtx */
RtlActivateActivationContextUnsafeFast(&ActCtx,
LdrEntry->EntryPointActivationContext);
/* Check the action we need to perform */
if ((Flags == LDRP_UPDATE_REFCOUNT) || (Flags == LDRP_UPDATE_PIN))
{
/* Make sure entry is not being loaded already */
if (LdrEntry->Flags & LDRP_LOAD_IN_PROGRESS)
return;
goto done;
LdrEntry->Flags |= LDRP_LOAD_IN_PROGRESS;
}
@ -234,7 +150,7 @@ LdrpUpdateLoadCount3(IN PLDR_DATA_TABLE_ENTRY LdrEntry,
{
/* Make sure the entry is not being unloaded already */
if (LdrEntry->Flags & LDRP_UNLOAD_IN_PROGRESS)
return;
goto done;
LdrEntry->Flags |= LDRP_UNLOAD_IN_PROGRESS;
}
@ -267,54 +183,38 @@ LdrpUpdateLoadCount3(IN PLDR_DATA_TABLE_ENTRY LdrEntry,
if (NT_SUCCESS(Status))
{
if (LdrpCheckForLoadedDll(NULL,
ImportNameUnic,
TRUE,
FALSE,
&Entry))
{
if (Entry->LoadCount != 0xFFFF)
{
/* Perform the required action */
switch (Flags)
{
case LDRP_UPDATE_REFCOUNT:
Entry->LoadCount++;
break;
case LDRP_UPDATE_DEREFCOUNT:
Entry->LoadCount--;
break;
case LDRP_UPDATE_PIN:
Entry->LoadCount = 0xFFFF;
break;
}
RedirectedDll = FALSE;
RedirectedImportName = ImportNameUnic;
/* Show snaps */
if (ShowSnaps)
{
DPRINT1("LDR: Flags %lu %wZ (%lx)\n", Flags, ImportNameUnic, Entry->LoadCount);
}
}
/* Check if the SxS Assemblies specify another file */
Status = RtlDosApplyFileIsolationRedirection_Ustr(TRUE,
ImportNameUnic,
&LdrApiDefaultExtension,
UpdateString,
NULL,
&RedirectedImportName,
NULL,
NULL,
NULL);
/* Recurse into this entry */
LdrpUpdateLoadCount3(Entry, Flags, UpdateString);
}
}
/* Go through forwarders */
NewImportForwarder = (PIMAGE_BOUND_FORWARDER_REF)(BoundEntry + 1);
for (i = 0; i < BoundEntry->NumberOfModuleForwarderRefs; i++)
{
ImportName = (LPSTR)FirstEntry + NewImportForwarder->OffsetModuleName;
RtlInitAnsiString(&ImportNameAnsi, ImportName);
Status = RtlAnsiStringToUnicodeString(ImportNameUnic, &ImportNameAnsi, FALSE);
/* Check success */
if (NT_SUCCESS(Status))
{
/* Let Ldrp know */
if (ShowSnaps)
{
DPRINT1("LDR: %Z got redirected to %wZ\n", &ImportNameAnsi, RedirectedImportName);
}
RedirectedDll = TRUE;
}
if (RedirectedDll || Status == STATUS_SXS_KEY_NOT_FOUND)
{
if (LdrpCheckForLoadedDll(NULL,
ImportNameUnic,
RedirectedImportName,
TRUE,
FALSE,
RedirectedDll,
&Entry))
{
if (Entry->LoadCount != 0xFFFF)
@ -336,13 +236,105 @@ LdrpUpdateLoadCount3(IN PLDR_DATA_TABLE_ENTRY LdrEntry,
/* Show snaps */
if (ShowSnaps)
{
DPRINT1("LDR: Flags %lu %wZ (%lx)\n", Flags, ImportNameUnic, Entry->LoadCount);
DPRINT1("LDR: Flags %lu %wZ (%lx)\n", Flags, RedirectedImportName, Entry->LoadCount);
}
}
/* Recurse into this entry */
LdrpUpdateLoadCount3(Entry, Flags, UpdateString);
}
else if (RedirectedDll)
{
DPRINT1("LDR: LdrpCheckForLoadedDll failed for redirected dll %wZ\n", RedirectedImportName);
}
}
else
{
/* Unrecoverable SxS failure */
DPRINT1("LDR: RtlDosApplyFileIsolationRedirection_Ustr failed with status %x for dll %wZ\n", Status, ImportNameUnic);
}
}
/* Go through forwarders */
NewImportForwarder = (PIMAGE_BOUND_FORWARDER_REF)(BoundEntry + 1);
for (i = 0; i < BoundEntry->NumberOfModuleForwarderRefs; i++)
{
ImportName = (LPSTR)FirstEntry + NewImportForwarder->OffsetModuleName;
RtlInitAnsiString(&ImportNameAnsi, ImportName);
Status = RtlAnsiStringToUnicodeString(ImportNameUnic, &ImportNameAnsi, FALSE);
if (NT_SUCCESS(Status))
{
RedirectedDll = FALSE;
RedirectedImportName = ImportNameUnic;
/* Check if the SxS Assemblies specify another file */
Status = RtlDosApplyFileIsolationRedirection_Ustr(TRUE,
ImportNameUnic,
&LdrApiDefaultExtension,
UpdateString,
NULL,
&RedirectedImportName,
NULL,
NULL,
NULL);
/* Check success */
if (NT_SUCCESS(Status))
{
if (ShowSnaps)
{
DPRINT1("LDR: %Z got redirected to %wZ\n", &ImportNameAnsi, RedirectedImportName);
}
/* Let Ldrp know */
RedirectedDll = TRUE;
}
if (RedirectedDll || Status == STATUS_SXS_KEY_NOT_FOUND)
{
if (LdrpCheckForLoadedDll(NULL,
RedirectedImportName,
TRUE,
RedirectedDll,
&Entry))
{
if (Entry->LoadCount != 0xFFFF)
{
/* Perform the required action */
switch (Flags)
{
case LDRP_UPDATE_REFCOUNT:
Entry->LoadCount++;
break;
case LDRP_UPDATE_DEREFCOUNT:
Entry->LoadCount--;
break;
case LDRP_UPDATE_PIN:
Entry->LoadCount = 0xFFFF;
break;
}
/* Show snaps */
if (ShowSnaps)
{
DPRINT1("LDR: Flags %lu %wZ (%lx)\n", Flags, RedirectedImportName, Entry->LoadCount);
}
}
/* Recurse into this entry */
LdrpUpdateLoadCount3(Entry, Flags, UpdateString);
}
else if (RedirectedDll)
{
DPRINT1("LDR: LdrpCheckForLoadedDll failed with status %x for redirected dll %wZ\n", Status, RedirectedImportName);
}
}
else
{
/* Unrecoverable SxS failure */
DPRINT1("LDR: RtlDosApplyFileIsolationRedirection_Ustr failed with status %x for dll %wZ\n", Status, ImportNameUnic);
}
}
NewImportForwarder++;
@ -352,7 +344,7 @@ LdrpUpdateLoadCount3(IN PLDR_DATA_TABLE_ENTRY LdrEntry,
}
/* We're done */
return;
goto done;
}
/* Check oldstyle import descriptor */
@ -380,44 +372,87 @@ LdrpUpdateLoadCount3(IN PLDR_DATA_TABLE_ENTRY LdrEntry,
Status = RtlAnsiStringToUnicodeString(ImportNameUnic, &ImportNameAnsi, FALSE);
if (NT_SUCCESS(Status))
{
if (LdrpCheckForLoadedDll(NULL,
ImportNameUnic,
TRUE,
FALSE,
&Entry))
{
if (Entry->LoadCount != 0xFFFF)
{
/* Perform the required action */
switch (Flags)
{
case LDRP_UPDATE_REFCOUNT:
Entry->LoadCount++;
break;
case LDRP_UPDATE_DEREFCOUNT:
Entry->LoadCount--;
break;
case LDRP_UPDATE_PIN:
Entry->LoadCount = 0xFFFF;
break;
}
RedirectedDll = FALSE;
RedirectedImportName = ImportNameUnic;
/* Show snaps */
if (ShowSnaps)
{
DPRINT1("LDR: Flags %lu %wZ (%lx)\n", Flags, ImportNameUnic, Entry->LoadCount);
}
/* Check if the SxS Assemblies specify another file */
Status = RtlDosApplyFileIsolationRedirection_Ustr(TRUE,
ImportNameUnic,
&LdrApiDefaultExtension,
UpdateString,
NULL,
&RedirectedImportName,
NULL,
NULL,
NULL);
/* Check success */
if (NT_SUCCESS(Status))
{
if (ShowSnaps)
{
DPRINT1("LDR: %Z got redirected to %wZ\n", &ImportNameAnsi, RedirectedImportName);
}
/* Recurse */
LdrpUpdateLoadCount3(Entry, Flags, UpdateString);
/* Let Ldrp know */
RedirectedDll = TRUE;
}
if (RedirectedDll || Status == STATUS_SXS_KEY_NOT_FOUND)
{
if (LdrpCheckForLoadedDll(NULL,
RedirectedImportName,
TRUE,
RedirectedDll,
&Entry))
{
if (Entry->LoadCount != 0xFFFF)
{
/* Perform the required action */
switch (Flags)
{
case LDRP_UPDATE_REFCOUNT:
Entry->LoadCount++;
break;
case LDRP_UPDATE_DEREFCOUNT:
Entry->LoadCount--;
break;
case LDRP_UPDATE_PIN:
Entry->LoadCount = 0xFFFF;
break;
}
/* Show snaps */
if (ShowSnaps)
{
DPRINT1("LDR: Flags %lu %wZ (%lx)\n", Flags, RedirectedImportName, Entry->LoadCount);
}
}
/* Recurse */
LdrpUpdateLoadCount3(Entry, Flags, UpdateString);
}
else if (RedirectedDll)
{
DPRINT1("LDR: LdrpCheckForLoadedDll failed for redirected dll %wZ\n", RedirectedImportName);
}
}
else
{
/* Unrecoverable SxS failure */
DPRINT1("LDR: RtlDosApplyFileIsolationRedirection_Ustr failed for dll %wZ\n", ImportNameUnic);
}
}
/* Go to the next entry */
ImportEntry++;
}
}
done:
/* Release the context */
RtlDeactivateActivationContextUnsafeFast(&ActCtx);
}
VOID
@ -665,7 +700,6 @@ LdrpResolveDllName(PWSTR DllPath,
PWCHAR NameBuffer, p1, p2 = 0;
ULONG Length;
ULONG BufSize = 500;
NTSTATUS Status;
/* Allocate space for full DLL name */
FullDllName->Buffer = RtlAllocateHeap(RtlGetProcessHeap(), 0, BufSize + sizeof(UNICODE_NULL));
@ -680,25 +714,14 @@ LdrpResolveDllName(PWSTR DllPath,
if (!Length || Length > BufSize)
{
/* HACK: Try to find active context dll */
Status = find_actctx_dll(DllName, FullDllName->Buffer);
if(Status == STATUS_SUCCESS)
if (ShowSnaps)
{
Length = wcslen(FullDllName->Buffer) * sizeof(WCHAR);
DPRINT1("found %S for %S\n", FullDllName->Buffer, DllName);
DPRINT1("LDR: LdrResolveDllName - Unable to find ");
DPRINT1("%ws from %ws\n", DllName, DllPath ? DllPath : LdrpDefaultPath.Buffer);
}
else
{
/* NOTE: This code should remain after removing the hack */
if (ShowSnaps)
{
DPRINT1("LDR: LdrResolveDllName - Unable to find ");
DPRINT1("%ws from %ws\n", DllName, DllPath ? DllPath : LdrpDefaultPath.Buffer);
}
RtlFreeUnicodeString(FullDllName);
return FALSE;
}
RtlFreeUnicodeString(FullDllName);
return FALSE;
}
/* Construct full DLL name */
@ -1038,7 +1061,7 @@ LdrpMapDll(IN PWSTR SearchPath OPTIONAL,
}
/* Check if we have a known dll directory */
if (LdrpKnownDllObjectDirectory)
if (LdrpKnownDllObjectDirectory && Redirect == FALSE)
{
/* Check if the path is full */
while (*p1)
@ -1977,8 +2000,10 @@ LdrpCheckForLoadedDll(IN PWSTR DllPath,
/* Look in the hash table if flag was set */
lookinhash:
if (Flag)
if (Flag /* the second check is a hack */ && !RedirectedDll)
{
/* FIXME: if we get redirected dll it means that we also get a full path so we need to find its filename for the hash lookup */
/* Get hash index */
HashIndex = LDR_GET_HASH_ENTRY(DllName->Buffer[0]);
@ -2006,58 +2031,54 @@ lookinhash:
return FALSE;
}
/* Check if there is a full path in this DLL */
wc = DllName->Buffer;
while (*wc)
/* Check if this is a redirected DLL */
if (RedirectedDll)
{
/* Check for a slash in the current position*/
if ((*wc == L'\\') || (*wc == L'/'))
/* Redirected dlls already have a full path */
FullPath = TRUE;
FullDllName = *DllName;
}
else
{
/* Check if there is a full path in this DLL */
wc = DllName->Buffer;
while (*wc)
{
/* Found the slash, so dll name contains path */
FullPath = TRUE;
/* Setup full dll name string */
FullDllName.Buffer = NameBuf;
/* FIXME: This is from the Windows 2000 loader, not XP/2003, we should call LdrpSearchPath */
Length = RtlDosSearchPath_U(DllPath ? DllPath : LdrpDefaultPath.Buffer,
DllName->Buffer,
NULL,
sizeof(NameBuf) - sizeof(UNICODE_NULL),
FullDllName.Buffer,
NULL);
/* Check if that was successful */
if (!(Length) || (Length > (sizeof(NameBuf) - sizeof(UNICODE_NULL))))
/* Check for a slash in the current position*/
if ((*wc == L'\\') || (*wc == L'/'))
{
/* HACK: Try to find active context dll */
Status = find_actctx_dll(DllName->Buffer, FullDllName.Buffer);
if(Status == STATUS_SUCCESS)
{
Length = wcslen(FullDllName.Buffer) * sizeof(WCHAR);
DPRINT1("found %S for %S\n", FullDllName.Buffer, DllName->Buffer);
}
else
{
/* Found the slash, so dll name contains path */
FullPath = TRUE;
if (ShowSnaps)
/* Setup full dll name string */
FullDllName.Buffer = NameBuf;
/* FIXME: This is from the Windows 2000 loader, not XP/2003, we should call LdrpSearchPath */
Length = RtlDosSearchPath_U(DllPath ? DllPath : LdrpDefaultPath.Buffer,
DllName->Buffer,
NULL,
sizeof(NameBuf) - sizeof(UNICODE_NULL),
FullDllName.Buffer,
NULL);
/* Check if that was successful */
if (!(Length) || (Length > (sizeof(NameBuf) - sizeof(UNICODE_NULL))))
{
DPRINT1("LDR: LdrpCheckForLoadedDll - Unable To Locate %wZ: 0x%08x\n",
&DllName, Length);
if (ShowSnaps)
{
DPRINT1("LDR: LdrpCheckForLoadedDll - Unable To Locate %wZ: 0x%08x\n",
&DllName, Length);
}
}
/* Return failure */
return FALSE;
}
/* Full dll name is found */
FullDllName.Length = Length;
FullDllName.MaximumLength = FullDllName.Length + sizeof(UNICODE_NULL);
break;
}
/* Full dll name is found */
FullDllName.Length = Length;
FullDllName.MaximumLength = FullDllName.Length + sizeof(UNICODE_NULL);
break;
wc++;
}
wc++;
}
/* Go check the hash table */