Re: [patch] mm: sparsemem memory_present() memory corruption fix

[Ingo Molnar <mingo@elte.hu>]

* Ingo Molnar <mingo@elte.hu> wrote:

> > > this is the only call to memory_present() we do in 32-bit arch 
> > > setup, so it's required.
> > 
> > We could clip there if SPARSEMEM is configured. I wonder if this 
> > affects other platforms that need HIGHMEM support?
> 
> clip where and what?

i.e. as per my previous argument i'd consider the need to sanitize the 
calls in the architecture fundamentally wrong.

whether the core code emits a warning or allows the call is an 
additional question i mention in the changelog - but the core sparse 
memory code should _definitely_ not silently overflow a key internal 
array ... (of which data structure the architecture code is not even 
aware of)

	Ingo