t_user_ns 1222 kernel/signal.c struct user_namespace *t_user_ns; t_user_ns 1225 kernel/signal.c t_user_ns = task_cred_xxx(t, user_ns); t_user_ns 1226 kernel/signal.c if (current_user_ns() != t_user_ns) { t_user_ns 1228 kernel/signal.c info->si_uid = from_kuid_munged(t_user_ns, uid);