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

From: "Alastair D'Silva" <alastair@au1.ibm.com>
To: alastair@d-silva.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Oscar Salvador <osalvador@suse.de>,
	Michal Hocko <mhocko@suse.com>,
	David Hildenbrand <david@redhat.com>,
	Pavel Tatashin <pasha.tatashin@soleen.com>,
	Dan Williams <dan.j.williams@intel.com>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: [PATCH v7 0/1] Add bounds check for Hotplugged memory
Date: Tue,  1 Oct 2019 10:46:14 +1000	[thread overview]
Message-ID: <20191001004617.7536-1-alastair@au1.ibm.com> (raw)

From: Alastair D'Silva <alastair@d-silva.org>

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(+)

-- 
2.21.0