linux-kernel - Re: [PATCH 2/2] ptrace: fix set_task_blockstep()->update

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Message-ID: <20120807153131.GA14238@redhat.com>
Date:	Tue, 7 Aug 2012 17:31:31 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anton Arapov <anton@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Roland McGrath <roland@...k.frob.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] ptrace: fix
	set_task_blockstep()->update_debugctlmsr() logic

On 08/07, Sebastian Andrzej Siewior wrote:
>
> On 08/07/2012 05:15 PM, Oleg Nesterov wrote:
>> It turns out, original code is even more buggy than I thought.
>>
>> Ironically, "task != current" case is more difficult and so far
>> I do not see how we can handle this case correctly. I'll return
>> to this a bit later, currently I am working on other patches.
>
> maybe you could remove the autodectect mode and add helper for uprobe
> which disables it.

No, this won't help.

So. Sorry for delay, I'll try to return to this tomorrow. Today
I spent THE WHOLE DAY trying to understand what is wrong with my
emails, and I did nothing else.

Oleg.

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