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

From: Serge Hallyn
Date: Thu Sep 22 2011 - 11:24:01 EST


Quoting Oleg Nesterov (oleg@xxxxxxxxxx):
> On 09/20, Serge E. Hallyn wrote:
> >
> > Quoting Oleg Nesterov (oleg@xxxxxxxxxx):
> > > 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.

Ah, I was misreading. I was mistakenly thinking tkill for instance was going
to be handled by the SEND_SIG_NOINFO case. I'll fix my patch, thanks!

-serge
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/