On 03/16/2017 09:07 AM, Dan Williams wrote: > Historically kasan has not been careful about whether vmemmap_populate() > internally allocates a section worth of memmap even if the parameters > call for less. For example, a request to shadow map a single page > results in a full section (128MB) that contains that page being mapped. > Also, kasan has not been careful to handle cases where this section > promotion causes overlaps / overrides of previous calls to > vmemmap_populate(). > > Before we teach vmemmap_populate() to support sub-section hotplug, > arrange for kasan to explicitly avoid vmemmap_populate_basepages(). > This should be functionally equivalent to the current state since > CONFIG_KASAN requires x86_64 (implies PSE) and it does not collide with > sub-section hotplug support since CONFIG_KASAN disables > CONFIG_MEMORY_HOTPLUG. > > Cc: Dmitry Vyukov <[email protected]> > Cc: Alexander Potapenko <[email protected]> > Cc: Andrey Ryabinin <[email protected]> > Reported-by: Nicolai Stange <[email protected]> > Signed-off-by: Dan Williams <[email protected]>
Acked-by: Andrey Ryabinin <[email protected]>
