linux-kernel - Re: [PATCH 4/7][v7] Protect cinit from unblocked SIG

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Message-ID: <20090117221242.GA3962@redhat.com>
Date:	Sat, 17 Jan 2009 23:12:42 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc:	ebiederm@...ssion.com, roland@...hat.com, bastian@...di.eu.org,
	daniel@...ac.com, xemul@...nvz.org, containers@...ts.osdl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/7][v7] Protect cinit from unblocked SIG_DFL signals

On 01/17, Sukadev Bhattiprolu wrote:
>
> @@ -1331,7 +1341,7 @@ int send_sigqueue(struct sigqueue *q, struct task_struct *t, int group)
>  		goto ret;
>
>  	ret = 1; /* the signal is ignored */
> -	if (!prepare_signal(sig, t))
> +	if (!prepare_signal(sig, t, 1))

Hmm, just noticed. This looks wrong, it should be prepare_signal(sig, t, 0),
no?

For example, /sbin/init can create the posix timer with sigev_signo = SIGKILL
and it won't be killed before this patch.

This also looks wrong from the masquerading pov.


Otherwise, the patches 1-6 are imho fine.

Oleg.

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