On Fri, Feb 09, 2024 at 11:28:17AM +0100, Oleg Nesterov wrote:
> On 02/08, Oleg Nesterov wrote:
> >
> > Is prepare_kill_siginfo() correct when we send a signal to the child
> > pid namespace? si_pid = task_tgid_vnr(current) doesn't look right
>
> Yes, but iiuc send_signal_locked() should fixup si_pid/si_uid, so it
> is not buggy.
It must've been. Yesterday I realized that otherwise kill(2) would have
been broken for a long time. I think this was originally fixed in commit
6588c1e3ff01 ("signals: SI_USER: Masquerade si_pid when crossing pid ns
boundary").
