linux-kernel - [PATCH v6 0/1] Add bounds check for Hotplugged memory

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Message-Id: <20190930062347.23620-1-alastair@au1.ibm.com>
Date:   Mon, 30 Sep 2019 16:23:45 +1000
From:   "Alastair D'Silva" <alastair@....ibm.com>
To:     alastair@...ilva.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Oscar Salvador <osalvador@...e.de>,
        Michal Hocko <mhocko@...e.com>,
        David Hildenbrand <david@...hat.com>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Dan Williams <dan.j.williams@...el.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v6 0/1] Add bounds check for Hotplugged memory

From: Alastair D'Silva <alastair@...ilva.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:
 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