Re: [PATCH] signal: don't silently convert SI_USER signals to non-current pidfd

[Oleg Nesterov]

On 04/17, Christian Brauner wrote:
>
> On Mon, Apr 08, 2019 at 03:13:16PM +0200, Oleg Nesterov wrote:
> >
> > but perhaps it should always fail, even if task_pid(current) == pid.
> >
> > sys_rt_sigqueueinfo() allows to send any siginfo to yourself, but this is only needed
> > for checkpoint/restart.
>
> Yes, that's why this was added. I would leave it in exactly because of
> checkpoint/restart.

I don't understand...

c/r doesn't need this "feature" in pidfd_send_signal(), so it can be removed.
But,

> I have sympathies for "this [...] project by various
> mad Russians" [1] and it doesn't really hurt us. :)

I won't argue, I agree it doesn't hurt and looks consistent with sys_rt_sigqueueinfo.

Oleg.