linux-kernel - Re: [PATCH 1/2] signals: kill(-1) should only signal processes in the same namespace

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Message-ID: <m1mykgv1q7.fsf@frodo.ebiederm.org>
Date:	Thu, 17 Jul 2008 10:50:56 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Pavel Emelyanov <xemul@...nvz.org>,
	Daniel Hokka Zakrisson <daniel@...ac.com>,
	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, akpm@...ux-foundation.org
Subject: Re: [PATCH 1/2] signals: kill(-1) should only signal processes in the same namespace

Oleg Nesterov <oleg@...sign.ru> writes:

> kill_something_info() can't walk threads, think about the realtime signals.

walking threads is fine delivering signals to non thread group leaders is
a problem.

> Anyway, I think we should change kill_something_info(-1) to use rcu_read_lock()
> instead of tasklist.

Being dense I think the locking implications of a correct implementation are more
then we are ready to deal with to fix this bug.  Although I remember discussing
it and seeing something reasonable.

Eric

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