On Thu, Feb 14, 2013 at 08:19:45PM +0400, Pavel Emelyanov wrote: > + struct sigevent event; [...] > + event.sigev_notify = timer->it_sigev_notify; > + event.sigev_signo = timer->sigq->info.si_signo; > + event.sigev_value = timer->sigq->info.si_value; > + event.sigev_notify_thread_id = pid_vnr(timer->it_pid); [...] > + if (old_event && copy_to_user(old_event, &event, sizeof(event))) Won't this leak uninitialized kernel stack data to userspace? As far as I can see, the _sigev_un union is bigger than the _tid field in it, so the rest of it will be copied over without initialization, right? Jann
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