linux-kernel - Re: [PATCH 1/5] uprobes: Change the callsite of uprobe_copy

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Message-ID: <20131016123704.GD19729@linux.vnet.ibm.com>
Date:	Wed, 16 Oct 2013 18:07:04 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Anton Arapov <aarapov@...hat.com>,
	David Smith <dsmith@...hat.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Martin Cermak <mcermak@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] uprobes: Change the callsite of uprobe_copy_process()

* Oleg Nesterov <oleg@...hat.com> [2013-10-13 21:18:31]:

> Preparation for the next patches.
> 
> Move the callsite of uprobe_copy_process() in copy_process() down
> to the succesfull return. We do not care if copy_process() fails,
> uprobe_free_utask() won't be called in this case so the wrong
> ->utask != NULL doesn't matter.
> 
> OTOH, with this change we know that copy_process() can't fail when
> uprobe_copy_process() is called, the new task should either return
> to user-mode or call do_exit(). This way uprobe_copy_process() can:
> 
> 	1. setup p->utask != NULL if necessary
> 
> 	2. setup uprobes_state.xol_area
> 
> 	3. use task_work_add(p)
> 
> Also, move the definition of uprobe_copy_process() down so that it
> can see get_utask().
> 
> Cc: stable@...r.kernel.org # 3.9+
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

Acked-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>


-- 
Thanks and Regards
Srikar Dronamraju

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