linux-kernel - Re: [PATCH 1/2] protect /sbin/init from unwanted signals more

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Message-ID: <20081120152039.GB3325@redhat.com>
Date:	Thu, 20 Nov 2008 16:20:39 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Roland McGrath <roland@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	"Serge E. Hallyn" <serue@...ibm.com>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] protect /sbin/init from unwanted signals more

On 11/19, Roland McGrath wrote:
>
> The effect is fine, but that seems like a kludgey way to do it.

Agreed, that is why I did the next patch to kill the ugliness.

> I really don't think the sigaction case matters--certainly it will never
> come up with SIGKILL.

Yes. This patch doesn't affect sigaction, the next one adds a very
minor side effect: init drops pending !sig_kernel_ignore() signals
if it does sigaction(SIG_IGN). But this has nothing to do with SIGKILL
of course.

> What about just this instead?
>
> +	if (unlikely(signal->flags & SIGNAL_UNKILLABLE) &&
> +	    (handler == SIG_IGN || handler == SIG_DFL))
> +		return 1;
> +
>  	if (!sig_handler_ignored(handler, sig))
>  		return 0;

Yes, this is the same, but anyway this is killed by the next patch.



> For consistency, change tracehook_consider_fatal_signal to match.

Yes, will do.

Oleg.

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