Re: mpol_to_str revisited.

[David Rientjes]

On Mon, 8 Oct 2012, Dave Jones wrote:

> If pol->mode was poisoned, that smells like we have a race where policy is getting freed
> while another process is reading it.
> 
> Am I missing something, or is there no locking around that at all ?
> 

The only thing that is held during the read() is a reference to the 
task_struct so it doesn't disappear from under us.  The protection needed 
for a task's mempolicy, however, is task_lock() and that is not held.
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