linux-kernel - Re: [PATCH 5/5] sh, hw_breakpoints: Fix racy access to ptrace breakpoints

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Message-ID: <20110411162818.GB13545@linux-sh.org>
Date:	Tue, 12 Apr 2011 01:28:19 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Will Deacon <will.deacon@....com>,
	Prasad <prasad@...ux.vnet.ibm.com>
Subject: Re: [PATCH 5/5] sh, hw_breakpoints: Fix racy access to ptrace breakpoints

On Fri, Apr 08, 2011 at 07:34:27PM +0200, Frederic Weisbecker wrote:
> While the tracer accesses ptrace breakpoints, the child task may
> concurrently exit due to a SIGKILL and thus release its breakpoints
> at the same time. We can then dereference some freed pointers.
> 
> To fix this, hold a reference on the child breakpoints before
> manipulating them.
> 
> Reported-by: Oleg Nesterov <oleg@...hat.com>
> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Prasad <prasad@...ux.vnet.ibm.com>
> Cc: Paul Mundt <lethal@...ux-sh.org>

Acked-by: Paul Mundt <lethal@...ux-sh.org>
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