[PATCH v7 0/1] Add bounds check for Hotplugged memory

Alastair D'Silva
2019-10-01T00:46:39Z

This series adds bounds checks for hotplugged memory, ensuring that
it is within the physically addressable range (for platforms that
define MAX_(POSSIBLE_)PHYSMEM_BITS.

This allows for early failure, rather than attempting to access
bogus section numbers.

Changelog:
V7:
- Cast PFN_PHYS as u64 since it's type is platform dependant
V6:
- Fix printf formats
V5:
- Factor out calculation into max_allowed var
- Declare unchanging vars as const
- Use PFN_PHYS macro instead of shifting by PAGE_SHIFT
V4:
- Relocate call to __add_pages
- Add a warning when the addressable check fails
V3:
- Perform the addressable check before we take the hotplug lock
V2:
- Don't use MAX_POSSIBLE_PHYSMEM_BITS as it's wider that what
may be available

Alastair D'Silva (1):
memory_hotplug: Add a bounds check to __add_pages

mm/memory_hotplug.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

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2.21.0