SИbastien DuguИ wrote:
>
> +struct task_struct *good_sigevent(sigevent_t *event)
> +{
> + struct task_struct *task = current->group_leader;
> +
> + if ((event->sigev_notify & SIGEV_THREAD_ID) == SIGEV_THREAD_ID) {
> + task = find_task_by_pid(event->sigev_notify_thread_id);
> +
> + if (!task || task->tgid != current->tgid)
> + return NULL;
> + } else if (event->sigev_notify == SIGEV_SIGNAL) {
No, no, we can't use "else" here,
> + if (event->sigev_signo <= 0 || event->sigev_signo > SIGRTMAX)
because we skip the check above in SIGEV_THREAD_ID case.
This way any user can crash the kernel with a minimal effort.
Oleg.
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