linux-kernel - Re: [PATCH 1/1] ptrace: make sure do_wait() won't hang after PTRACE

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Message-ID: <20110214151928.GQ18742@htj.dyndns.org>
Date:	Mon, 14 Feb 2011 16:19:28 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Denys Vlasenko <vda.linux@...glemail.com>,
	Roland McGrath <roland@...hat.com>, jan.kratochvil@...hat.com,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 1/1] ptrace: make sure do_wait() won't hang after
 PTRACE_ATTACH

Hello,

On Mon, Feb 14, 2011 at 04:06:56PM +0100, Oleg Nesterov wrote:
> This was (very briefly) discussed recently. Probably we can implement
> PTRACE_DETACH_RUNNING (the name is random) which doesn't require the
> stopped tracee but ignores the "data" argument.

I think the root problem is not how ptrace detaches but how ptrace
attaches and stops tracee.  If we have a clean way to seize the
tracee, how we detach doesn't really matter.  For example, a new
ptrace call which stops the tracee and puts it in a ptrace command
ready state without messing with the signal and group stop stuff.

Thanks.

-- 
tejun
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