linux-kernel - Re: [PATCH 2/4] signals: send_signal: use si_fromuser() to detect from_ancestor

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Date:	Mon, 5 Oct 2009 17:16:31 -0700
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Lezcano <dlezcano@...ibm.com>,
	Sukadev Bhattiprolu <sukadev@...ibm.com>,
	Linux Containers <containers@...ts.osdl.org>,
	roland@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] signals: send_signal: use si_fromuser() to detect
	from_ancestor_ns

Oleg Nesterov [oleg@...hat.com] wrote:
| Change send_signal() to use si_fromuser(). From now SEND_SIG_NOINFO
| triggers the "from_ancestor_ns" check.
| 
| This fixes reparent_thread()->group_send_sig_info(pdeath_signal)
| behaviour, before this patch send_signal() does not detect the
| cross-namespace case when the child of the dying parent belongs
| to the sub-namespace.
| 
| This patch can affect the behaviour of send_sig(), kill_pgrp() and
| kill_pid() when the caller sends the signal to the sub-namespace
| with "priv == 0" but surprisingly all callers seem to use them
| correctly, including disassociate_ctty(on_exit).
| 
| Except: drivers/staging/comedi/drivers/addi-data/*.c incorrectly
| use send_sig(priv => 0). But his is minor and should be fixed
| anyway.
| 
| Reported-by: Daniel Lezcano <dlezcano@...ibm.com>
| Signed-off-by: Oleg Nesterov <oleg@...hat.com>

Since, addressing the problem of container-init sending SIGKILL to itself
would have to be a separate patch:

Reviewed-by: Sukadev Bhattiprolu <sukadev@...ibm.com>
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