linux-kernel - Re: [PATCH 1/1] ptrace: do_notify_parent_cldstop: fix the wrong ->nsproxy usage

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Date:	Wed, 27 May 2009 16:26:17 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] ptrace: do_notify_parent_cldstop: fix the wrong
	->nsproxy usage

> No, task_pid_vnr(current) in ptrace_notify() is not right. If the tracer
> does PTRACE_GETSIGINFO it gets the wrong .si_pid.

I don't follow.  PTRACE_GETSIGINFO gets the tracee's siginfo_t data--modulo
32/64 conversions it's the data structure the tracee process sees on its
stack when running a handler.  It's not like a signal sent into the
tracer's queue (like SIGCHLD in do_notify_*), where the kernel doing
translation to the tracer's context makes sense.  It's more like some
memory you read from the tracee.

Thanks,
Roland
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