linux-kernel - Re: [RFC][PATCH 4/5] Protect cinit from fatal signals

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Message-ID: <20081201202112.GC12493@us.ibm.com>
Date:	Mon, 1 Dec 2008 12:21:12 -0800
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	Bastian Blank <bastian@...di.eu.org>, oleg@...hat.com,
	ebiederm@...ssion.com, roland@...hat.com,
	containers@...ts.osdl.org, linux-kernel@...r.kernel.org,
	xemul@...nvz.org
Subject: Re: [RFC][PATCH 4/5] Protect cinit from fatal signals

Bastian Blank [bastian@...di.eu.org] wrote:
| On Tue, Nov 25, 2008 at 07:46:34PM -0800, Sukadev Bhattiprolu wrote:
| > To protect container-init from fatal signals, set SIGNAL_UNKILLABLE but
| > clear it if it receives SIGKILL from parent namespace - so it is still
| > killable from ancestor namespace.
| 
| This sounds like a workaround.

yes...
| 
| > Note that container-init is still somewhat special compared to 'normal
| > processes' - unhandled fatal signals like SIGUSR1 to a container-init
| > are dropped even if they are from ancestor namespace. SIGKILL from an
| > ancestor namespace is the only reliable way to kill a container-init.
| 
| It sounds not right to make this special case for a "normal" process.
| 
| However, no idea how to do this better.

... like I mentioned in the other message, we have tried different
approaches and they were either intrusive or required more drastic
changes in semantics.

Container-inits are special in some ways and this change requires SIGKILL
to terminate them.
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