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

[Paul Mundt]

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@xxxxxxxxxx>
> Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxx>
> Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
> Cc: Will Deacon <will.deacon@xxxxxxx>
> Cc: Prasad <prasad@xxxxxxxxxxxxxxxxxx>
> Cc: Paul Mundt <lethal@xxxxxxxxxxxx>

Acked-by: Paul Mundt <lethal@xxxxxxxxxxxx>
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