linux-kernel - Re: [PATCH] signal: don't silently convert SI

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Message-ID: <20190417131904.qjkv2xuenhcsz36l@brauner.io>
Date:   Wed, 17 Apr 2019 15:19:06 +0200
From:   Christian Brauner <christian@...uner.io>
To:     Oleg Nesterov <oleg@...hat.com>
Cc:     Jann Horn <jannh@...gle.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Arnd Bergmann <arnd@...db.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] signal: don't silently convert SI_USER signals to
 non-current pidfd

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