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

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Message-ID: <20151105201720.GA15763@redhat.com>
Date:	Thu, 5 Nov 2015 21:17:20 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	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: [PATCH 0/3] signal: kill the obsolete SIGNAL_UNKILLABLE check in
	complete_signal()

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.

I'll try to send the cleanups tomorrow. sig_task_ignored() doesn't
look nice, sig_handler_ignored() must die, SIGNAL_UNKILLABLE checks
in sig_task_ignored() and get_signal() should be unified.

And to remind, we need to fix more problems I found yesterday.

Oleg.

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