linux-kernel - Re: [PATCH] pid_ns: zap_pid_ns_processes: use SEND_SIG_NOINFO instead of force

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Date:	Thu, 4 Mar 2010 08:06:12 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Oleg Nesterov <oleg@...hat.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Roland McGrath <roland@...hat.com>, wylda@...ny.cz,
	gregkh@...e.de, jkosina@...e.cz,
	Sukadev Bhattiprolu <sukadev@...ibm.com>,
	Serge Hallyn <serue@...ibm.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pid_ns: zap_pid_ns_processes: use SEND_SIG_NOINFO instead
 of force_sig()



On Wed, 3 Mar 2010, Oleg Nesterov wrote:
>
> zap_pid_ns_processes() uses force_sig(SIGKILL) to ensure SIGKILL
> will be delivered to sub-namespace inits as well. This is correct,
> but we are going to change force_sig_info() semantics.
> See http://bugzilla.kernel.org/show_bug.cgi?id=15395#c31
> 
> We can use send_sig_info(SEND_SIG_NOINFO) instead, since
> 614c517d7c00af1b26ded20646b329397d6f51a1 SEND_SIG_NOINFO means
> "from user" and therefore send_signal() will get the correct
> from_ancestor_ns = T flag.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

Acked-by: Linus Torvalds <torvalds@...ux-foundation.org>

			Linus
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