Cygwin: fork: restrict parent handle perms and drop handle after use

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

winsup/cygwin/dcrt0.cc

@@ -637,7 +637,8 @@ child_info_fork::handle_fork ()
 bool
 child_info_spawn::get_parent_handle ()
 {
-  parent = OpenProcess (PROCESS_VM_READ, false, parent_winpid);
+  parent = OpenProcess (PROCESS_QUERY_LIMITED_INFORMATION, FALSE,
+			parent_winpid);
   moreinfo->myself_pinfo = NULL;
   return !!parent;
 }