Re: [Xen-devel] out of bounds handling for get_mfn_from_gpfn()

["Jan Beulich" <jbeulich@xxxxxxxxxx>]

>Okay, maybe we need to be more restrictive: 20 bits for 32b (4GB), 22 
>bits for 32b-pae (16GB), and some suitable large value for 64b (31 
>would be fine, it's good for up to 8TB).

Then perhaps the way to go would be to really check against
((RO_MPT_VIRT_END - RO_MPT_VIRT_START) / sizeof(*phys_to_machine_mapping)).
This wouldn't be 31 bits for x86-64, but it seems to me that allowing 35-bit 
gpfn-s
wouldn't be that bad an idea (and the fact that the array currently may only get
populated up to 31-bit gpfn-s wouldn't seem to cause any problems). I'll 
prepare a
patch...

Jan

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