linux-kernel - Re: [PATCH 0/3] signal: kill the obsolete SIGNAL_UNKILLABLE check in complete

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Date:	Thu, 5 Nov 2015 15:33:46 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Dmitry Vyukov <dvyukov@...gle.com>,
	Roland McGrath <roland@...k.frob.com>, amanieu@...il.com,
	pmoore@...hat.com, Ingo Molnar <mingo@...nel.org>,
	vdavydov@...allels.com, qiaowei.ren@...el.com, dave@...olabs.net,
	palmer@...belt.com, syzkaller <syzkaller@...glegroups.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] signal: kill the obsolete SIGNAL_UNKILLABLE check
 in complete_signal()

On Thu, 5 Nov 2015 21:17:20 +0100 Oleg Nesterov <oleg@...hat.com> wrote:

> On 11/05, Oleg Nesterov wrote:
> >
> > Cough... and on the second thought this patch needs v2. Sorry Andrew, please
> > drop signal-kill-the-obsolete-signal_unkillable-check-in-complete_signal.patch
> > I'll send the updated version.
> >
> > With this patch the parent namespace can use any fatal signal (not only SIGKILL)
> > to kill the init process in container. I do not think this is actually bad, but
> > in any case this should not silently come as a side effect. And this is not
> > consistent with SIGNAL_UNKILLABLE/sig_kernel_only() check in get_signal().
> >
> > Most probably I will just resend this patch as 2/2, while 1/2 will change
> > sig_task_ignored() because afaics it is not actually right too (albeit not
> > really buggy).
> 
> So this replaces
> signal-kill-the-obsolete-signal_unkillable-check-in-complete_signal.patch
> 2/3 is actually the same change, just the changelog was updated.

It's awfully late.  Do you see any reason why we should jam this into 4.4?
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