linux-kernel - Re: [RFC,PATCH] fix /sbin/init signal handling

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Message-ID: <20070821103002.GA164@tv-sign.ru>
Date:	Tue, 21 Aug 2007 14:30:02 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	sukadev@...ibm.com
Cc:	Daniel Pittman <daniel@...space.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Ingo Molnar <mingo@...e.hu>, Kirill Korotaev <dev@...ru>,
	Pavel Emelyanov <xemul@...ru>,
	Roland McGrath <roland@...hat.com>,
	"Serge E. Hallyn" <serue@...ibm.com>, containers@...ts.osdl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC,PATCH] fix /sbin/init signal handling

On 08/21, sukadev@...ibm.com wrote:
> 
> I am still reviewing this patch and will try to plug in the multiple
> pid ns code and play with it some more in the next couple of days.

Thanks!

> But am curious why we need the in_interrupt() check and that too only
> for the container-init process.

For example, send_sigio(). We shouldn't send this signal to /sbin/init.
But what if the interrupted process is from the parent namespace?

> Also, maybe a dumb que, are the checks for SIG_IGN and SIG_DFL required
> both on sender side and the receiver side (get_signal_to_deliver())

get_signal_to_deliver() checks SIG_IGN/SIG_DFL, but I guess you meant
a special check for init.

Unless the patch is wrong, this is not needed. And, in fact we can't do
this anyway. Because get_signal_to_deliver() can't know if the signal
comes from parent namespace or not.

Oleg.

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