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

[Christian Brauner]

On Wed, Apr 17, 2019 at 03:16:03PM +0200, Oleg Nesterov wrote:
> 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,

Just out of curiosity: in what sense? They don't need it since they have
other ways of doing this or they *can't* use it for some other reason
I'm not seeing?

Christian