ntdll: Return a correct name also for file objects in NtQueryObject.

dlls/ntdll/file.c

@@ -1633,7 +1633,7 @@ NTSTATUS fill_stat_info( const struct stat *st, void *ptr, FILE_INFORMATION_CLAS
     return STATUS_SUCCESS;
 }
 
-static NTSTATUS server_get_unix_name( HANDLE handle, ANSI_STRING *unix_name )
+NTSTATUS server_get_unix_name( HANDLE handle, ANSI_STRING *unix_name )
 {
     data_size_t size = 1024;
     NTSTATUS ret;

dlls/ntdll/ntdll_misc.h

@@ -142,6 +142,7 @@ extern NTSTATUS TAPE_DeviceIoControl(HANDLE hDevice,
 struct stat;
 extern NTSTATUS FILE_GetNtStatus(void);
 extern NTSTATUS fill_stat_info( const struct stat *st, void *ptr, FILE_INFORMATION_CLASS class );
+extern NTSTATUS server_get_unix_name( HANDLE handle, ANSI_STRING *unix_name );
 extern void DIR_init_windows_dir( const WCHAR *windir, const WCHAR *sysdir );
 extern BOOL DIR_is_hidden_file( const UNICODE_STRING *name );
 extern NTSTATUS DIR_unmount_device( HANDLE handle );

dlls/ntdll/om.c

@@ -88,6 +88,34 @@ NTSTATUS WINAPI NtQueryObject(IN HANDLE handle,
     case ObjectNameInformation:
         {
             OBJECT_NAME_INFORMATION* p = ptr;
+            ANSI_STRING unix_name;
+
+            /* first try as a file object */
+
+            if (!(status = server_get_unix_name( handle, &unix_name )))
+            {
+                UNICODE_STRING nt_name;
+                NTSTATUS status;
+
+                if (!(status = wine_unix_to_nt_file_name( &unix_name, &nt_name )))
+                {
+                    if (sizeof(*p) + nt_name.MaximumLength <= len)
+                    {
+                        p->Name.Buffer = (WCHAR *)(p + 1);
+                        p->Name.Length = nt_name.Length;
+                        p->Name.MaximumLength = nt_name.MaximumLength;
+                        memcpy( p->Name.Buffer, nt_name.Buffer, nt_name.MaximumLength );
+                    }
+                    else status = STATUS_INFO_LENGTH_MISMATCH;
+                    if (used_len) *used_len = sizeof(*p) + nt_name.MaximumLength;
+                    RtlFreeUnicodeString( &nt_name );
+                }
+                RtlFreeAnsiString( &unix_name );
+                break;
+            }
+            else if (status != STATUS_OBJECT_TYPE_MISMATCH) break;
+
+            /* not a file, treat as a generic object */
 
             SERVER_START_REQ( get_object_info )
             {

dlls/ntdll/tests/om.c

@@ -627,6 +627,7 @@ static void test_query_object(void)
     NTSTATUS status;
     ULONG len;
     UNICODE_STRING *str;
+    char dir[MAX_PATH];
 
     handle = CreateEventA( NULL, FALSE, FALSE, "test_event" );
 
@@ -667,6 +668,18 @@ static void test_query_object(void)
     ok( str->Length == 0, "unexpected len %u\n", len );
     ok( str->Buffer == NULL, "unexpected ptr %p\n", str->Buffer );
     pNtClose( handle );
+
+    GetWindowsDirectoryA( dir, MAX_PATH );
+    handle = CreateFileA( dir, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
+                          FILE_FLAG_BACKUP_SEMANTICS, 0 );
+    len = 0;
+    status = pNtQueryObject( handle, ObjectNameInformation, buffer, sizeof(buffer), &len );
+    ok( status == STATUS_SUCCESS, "NtQueryObject failed %x\n", status );
+    ok( len > sizeof(UNICODE_STRING), "unexpected len %u\n", len );
+    str = (UNICODE_STRING *)buffer;
+    ok( sizeof(UNICODE_STRING) + str->Length + sizeof(WCHAR) == len, "unexpected len %u\n", len );
+    trace( "got %s len %u\n", wine_dbgstr_w(str->Buffer), len );
+    pNtClose( handle );
 }
 
 START_TEST(om)