linux-kernel - Re: [PATCH 1/1] ptrace: do_notify_parent_cldstop: fix the wrong ->nsproxy usage

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Date:	Tue, 26 May 2009 17:55:27 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] ptrace: do_notify_parent_cldstop: fix the wrong
	->nsproxy usage

> Yes. Perhaps it would be nice to add a helper,

I agree.

> > sys_kill, do_tkill all look wrong to me.
> 
> They should be fine, note the
> 
> 	if (from_ancestor_ns)
> 		q->info.si_pid = 0;
> 
> in __send_signal(). If we send the signal "down" to the sub-namespace,
> si_pid == 0 is correct. And, unlike do_notify_parent/ptrace_notify/etc
> kill/tkill can't send the signal "up".

Ah, right.  I knew there was something around this I was forgetting.


Thanks,
Roland
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