linux-kernel - Re: [PATCH 1/1] signals: introduce send

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Date:	Fri, 11 Jun 2010 09:40:45 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Roland McGrath <roland@...hat.com>,
	"Luis Claudio R. Goncalves" <lclaudio@...g.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	David Rientjes <rientjes@...gle.com>,
	Nick Piggin <npiggin@...e.de>,
	Minchan Kim <minchan.kim@...il.com>
Subject: Re: [PATCH 1/1] signals: introduce send_sigkill() helper

On Thu, 10 Jun 2010 03:00:23 +0200
Oleg Nesterov <oleg@...hat.com> wrote:

> Cleanup, no functional changes.
> 
> There are a lot of buggy SIGKILL users in kernel. For example, almost
> every force_sig(SIGKILL) is wrong. force_sig() is not safe, it assumes
> that the task has the valid ->sighand, and in general it should be used
> only for synchronous signals. send_sig(SIGKILL, p, 1) or
> send_xxx(SEND_SIG_FORCED/SEND_SIG_PRIV) is not right too but this is not
> immediately obvious.
> 
> The only way to correctly send SIGKILL is send_sig_info(SEND_SIG_NOINFO)
> but we do not want to use this directly, because we can optimize this
> case later. For example, zap_pid_ns_processes() allocates sigqueue for
> each process in namespace, this is unneeded.
> 
> Introduce the trivial send_sigkill() helper on top of send_sig_info()
> and change zap_pid_ns_processes() as an example.
> 
> Note: we need more cleanups here, this is only the first change.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

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