linux-kernel - Re: [PATCH v3] ptrace: Fix fork event messages across pid namespaces

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Date:	Mon, 7 Apr 2014 21:24:19 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Matthew Dempsky <mdempsky@...omium.org>
Cc:	Kees Cook <keescook@...omium.org>,
	Julien Tinnes <jln@...omium.org>,
	Roland McGrath <mcgrathr@...omium.org>,
	Jan Kratochvil <jan.kratochvil@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] ptrace: Fix fork event messages across pid
	namespaces

On 04/02, Matthew Dempsky wrote:
>
> On Wed, Apr 2, 2014 at 2:58 PM, Matthew Dempsky <mdempsky@...gle.com> wrote:
> > Otherwise, it looks like (e.g.) the attempts to get the parent's pid
> > in fill_prstatus() and tomoyo_sys_getppid() are also theoretical races
> > of the same kind?
>
> Doh, nevermind, those functions would potentially be use null "struct
> pid" pointers, not "struct pid_namespace" pointers; and pid_nr_ns()
> guards against pid being null.

Yes, and they want the parent's pid, not ours pid in parent's namespace.

Hmm. In fact I am replying only because I am not sure fill_psinfo() is
correct, perhaps it confuses tid with tgid. I dunno.

Oleg.

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