linux-kernel - Re: [PATCH 4/5] uprobes: Change uprobe_copy_process() to dup return

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Message-ID: <20131014184548.GG2675@laptop.programming.kicks-ass.net>
Date:	Mon, 14 Oct 2013 20:45:48 +0200
From:	Peter Zijlstra <peterz@...radead.org>
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>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] uprobes: Change uprobe_copy_process() to dup
 return_instances

On Sun, Oct 13, 2013 at 09:18:41PM +0200, Oleg Nesterov wrote:
> uprobe_copy_process() assumes that the new child doesn't need
> ->utask, it should be allocated by demand.
> 
> But this is not true if the forking task has the pending ret-
> probes, the child should report them as well and thus it needs
> the copy of parent's ->return_instances chain. Otherwise the
> child crashes when it returns from the probed function.

So children don't automagically inherit the same probes (only though the
high level interface -- like perf), so wouldn't simply fixing up the
child stack be a solution?

If not; its not entirely clear to my why this isn't a good solution
based on these changelogs.
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