ntoskrnl.exe: Implement ObOpenObjectByPointer.

Signed-off-by: Jacek Caban <jacek@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dlls/ntoskrnl.exe/ntoskrnl.c

@@ -511,6 +511,40 @@ POBJECT_TYPE WINAPI ObGetObjectType( void *object )
     return header->type;
 }
 
+/***********************************************************************
+ *           ObOpenObjectByPointer    (NTOSKRNL.EXE.@)
+ */
+NTSTATUS WINAPI ObOpenObjectByPointer( void *obj, ULONG attr, ACCESS_STATE *access_state,
+                                       ACCESS_MASK access, POBJECT_TYPE type,
+                                       KPROCESSOR_MODE mode, HANDLE *handle )
+{
+    NTSTATUS status;
+
+    TRACE( "%p %x %p %x %p %d %p\n", obj, attr, access_state, access, type, mode, handle );
+
+    if (mode != KernelMode)
+    {
+        FIXME( "UserMode access not implemented\n" );
+        return STATUS_NOT_IMPLEMENTED;
+    }
+
+    if (attr & ~OBJ_KERNEL_HANDLE) FIXME( "access %x not supported\n", access );
+    if (access_state) FIXME( "access_state not implemented\n" );
+
+    if (type && ObGetObjectType( obj ) != type) return STATUS_OBJECT_TYPE_MISMATCH;
+
+    SERVER_START_REQ( get_kernel_object_handle )
+    {
+        req->manager  = wine_server_obj_handle( get_device_manager() );
+        req->user_ptr = wine_server_client_ptr( obj );
+        req->access   = access;
+        if (!(status = wine_server_call( req )))
+            *handle = wine_server_ptr_handle( reply->handle );
+    }
+    SERVER_END_REQ;
+    return status;
+}
+
 
 static void *create_file_object( HANDLE handle );
 

dlls/ntoskrnl.exe/ntoskrnl.exe.spec

@@ -822,7 +822,7 @@
 @ stub ObLogSecurityDescriptor
 @ stub ObMakeTemporaryObject
 @ stub ObOpenObjectByName
-@ stub ObOpenObjectByPointer
+@ stdcall ObOpenObjectByPointer(ptr long ptr long ptr long ptr)
 @ stdcall ObQueryNameString(ptr ptr long ptr)
 @ stub ObQueryObjectAuditingByHandle
 @ stdcall ObReferenceObjectByHandle(long long ptr long ptr ptr)

dlls/ntoskrnl.exe/tests/driver.c

@@ -773,7 +773,7 @@ static void test_ob_reference(const WCHAR *test_path)
 {
     POBJECT_TYPE (WINAPI *pObGetObjectType)(void*);
     OBJECT_ATTRIBUTES attr = { sizeof(attr) };
-    HANDLE event_handle, file_handle, file_handle2, thread_handle;
+    HANDLE event_handle, file_handle, file_handle2, thread_handle, handle;
     DISPATCHER_HEADER *header;
     FILE_OBJECT *file;
     void *obj1, *obj2;
@@ -878,9 +878,24 @@ static void test_ob_reference(const WCHAR *test_path)
     status = wait_single(header, 0);
     ok(status == 0 || status == STATUS_TIMEOUT, "got %#x\n", status);
 
-    ObDereferenceObject(obj1);
     ObDereferenceObject(obj2);
 
+    status = ObOpenObjectByPointer(obj1, OBJ_KERNEL_HANDLE, NULL, 0, NULL, KernelMode, &handle);
+    ok(status == STATUS_SUCCESS, "ObOpenObjectByPointer failed: %#x\n", status);
+
+    status = ZwClose(handle);
+    ok(!status, "ZwClose failed: %#x\n", status);
+
+    status = ObReferenceObjectByHandle(thread_handle, SYNCHRONIZE, *pPsThreadType, KernelMode, &obj2, NULL);
+    ok(!status, "ObReferenceObjectByHandle failed: %#x\n", status);
+    ok(obj1 == obj2, "obj1 != obj2\n");
+    ObDereferenceObject(obj2);
+
+    status = ObOpenObjectByPointer(obj1, OBJ_KERNEL_HANDLE, NULL, 0, *pIoFileObjectType, KernelMode, &handle);
+    ok(status == STATUS_OBJECT_TYPE_MISMATCH, "ObOpenObjectByPointer returned: %#x\n", status);
+
+    ObDereferenceObject(obj1);
+
     status = ZwClose(thread_handle);
     ok(!status, "ZwClose failed: %#x\n", status);
 

include/ddk/ntifs.h

@@ -130,6 +130,7 @@ typedef struct _FS_FILTER_CALLBACKS
 } FS_FILTER_CALLBACKS, *PFS_FILTER_CALLBACKS;
 
 BOOLEAN WINAPI FsRtlIsNameInExpression(PUNICODE_STRING, PUNICODE_STRING, BOOLEAN, PWCH);
+NTSTATUS WINAPI ObOpenObjectByPointer(void*,ULONG,PACCESS_STATE,ACCESS_MASK,POBJECT_TYPE,KPROCESSOR_MODE,HANDLE*);
 NTSTATUS WINAPI ObQueryNameString(PVOID,POBJECT_NAME_INFORMATION,ULONG,PULONG);
 BOOLEAN WINAPI PsIsSystemThread(PETHREAD);
 NTSTATUS WINAPI PsLookupProcessByProcessId(HANDLE,PEPROCESS*);