linux-kernel - Re: [PATCH] user namespace: make signal.c respect user namespaces

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Date:	Fri, 23 Sep 2011 19:36:56 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	"Serge E. Hallyn" <serge.hallyn@...onical.com>
Cc:	lkml <linux-kernel@...r.kernel.org>, richard@....at,
	Andrew Morton <akpm@...gle.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Tejun Heo <tj@...nel.org>, serge@...lyn.com
Subject: Re: [PATCH] user namespace: make signal.c respect user namespaces

On 09/23, Serge E. Hallyn wrote:
>
> It looks like I can fix all the
> cases

except ptrace_signal(). Although we can simply ignore this case, imho.

> at send_signal()

Yes, I was thinking about this too but didn't have the time to check
if this can really work.

> by checking whether si_fromuser(info)

I am not sure... sys_rt_queueinfo() is nasty. Plus we have to handle
the "fromkernel" case too. May be we can ignore this too.

Oleg.

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