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

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Message-ID: <20110203214450.GA29496@redhat.com>
Date:	Thu, 3 Feb 2011 22:44:50 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Roland McGrath <roland@...hat.com>
Cc:	Tejun Heo <tj@...nel.org>, 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

On 02/03, Roland McGrath wrote:
>
> IMHO this sort of band-aid does not really help the overall situation.
> It takes something that is intricate and fiddly and just fiddles it a
> bit more.  Userland will still have to handle older kernels where this
> behavior is not there.  If userland does anything that relies on this
> new behavior, then it will have to try somehow to figure out which
> kernel versions have which behavior and adapt, etc.

Absolutely agreed.

As I said, I am not sure this patch makes sense. I only sent it
because I have to react to the bug report.

> When the old behaviors are unhelpful like this, I think it is really
> better to add new mechanisms instead.

Agreed!

Can't resist, let me repeat... imho ptrace is unfixable ;)


OK, please ignore this patch.

Oleg.

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