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

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Date:	Wed, 21 Sep 2011 19:53:57 +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 09/20, Serge E. Hallyn wrote:
>
> Quoting Oleg Nesterov (oleg@...hat.com):
> > On 09/19, Serge E. Hallyn wrote:
> > >
> > > __send_signal: convert the uid being sent in SI_USER to the target task's
> > > user namespace.
> > >
> > > do_notify_parent and do_notify_parent_cldstop: map task's uid to parent's
> > >  user namespace
> > >
> > > ptrace_signal: map parent's uid into current's user namespace before
> > > including in signal to current.
> >
> > Btw, what about the other users of ->si_uid? Say, kill() or tkill().
>
> Well, they end up calling __send_signal().

Sure. But your patch changes only the __send_signal(SEND_SIG_NOINFO).
Note that SEND_SIG_NOINFO is rarely used, and only by kernel.

> But you sound more alarmed than that.

I am ;)

Oleg.

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