linux-kernel - Re: Signals to cinit

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Message-ID: <20081112165319.GC14572@us.ibm.com>
Date:	Wed, 12 Nov 2008 10:53:19 -0600
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	sukadev@...ux.vnet.ibm.com,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Pavel Emelyanov <xemul@...nvz.org>, daniel@...ac.com,
	Nadia Derbey <Nadia.Derbey@...l.net>, clg@...ibm.com,
	Containers <containers@...ts.osdl.org>, sukadev@...ibm.com,
	linux-kernel@...r.kernel.org
Subject: Re: Signals to cinit

Quoting Oleg Nesterov (oleg@...hat.com):
> --- K-IS/kernel/signal.c~T	2008-11-10 19:21:17.000000000 +0100
> +++ K-IS/kernel/signal.c	2008-11-10 20:31:24.000000000 +0100
> @@ -798,11 +798,19 @@ static inline int legacy_queue(struct si
>  	return (sig < SIGRTMIN) && sigismember(&signals->signal, sig);
>  }
> 
> +#define SIG_FROM_USER	INT_MIN		/* MSB */
> +
>  static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
>  			int group)
>  {
>  	struct sigpending *pending;
>  	struct sigqueue *q;
> +	int from_ancestor_ns;
> +
> +	from_ancestor_ns = !is_si_special(info) &&
> +		(info->si_signo | SIG_FROM_USER) &&

I assume you mean '&'?

> +		/* if t can't see us we are from parent ns */
> +		task_pid_nr_ns(current, t->current->nsproxy->pid_ns) <= 0;

This doesn't look so bad...  (but still looking through followup emails)

-serge
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