linux-kernel - [PATCH v2 0/2] mm: Don't access uninitialized memmaps in PFN walkers

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Message-Id: <20191009142435.3975-1-david@redhat.com>
Date:   Wed,  9 Oct 2019 16:24:33 +0200
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, David Hildenbrand <david@...hat.com>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Anthony Yznaga <anthony.yznaga@...cle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Michal Hocko <mhocko@...nel.org>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Pankaj gupta <pagupta@...hat.com>, Qian Cai <cai@....pw>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Toshiki Fukasawa <t-fukasawa@...jp.nec.com>
Subject: [PATCH v2 0/2] mm: Don't access uninitialized memmaps in PFN walkers

This is the follow-up of:
  [PATCH v1] mm: Fix access of uninitialized memmaps in fs/proc/page.c

We have multiple places where we might access uninitialized memmaps and
trigger kernel BUGs. Make sure to only access initialized memmaps.

Some of these places got easier to trigger with:
  [PATCH v6 00/10] mm/memory_hotplug: Shrink zones before removing memory
As memmaps are now also poisoned when memory is offlined, before it is
actually removed.

v1 -> v2:
- Drop ZONE_DEVICE support from the /proc/k... files as requested by Michal
- Further simplify the code
- Split up into two patches

David Hildenbrand (2):
  mm: Don't access uninitialized memmaps in fs/proc/page.c
  mm/memory-failure.c: Don't access uninitialized memmaps in
    memory_failure()

 fs/proc/page.c      | 28 ++++++++++++++++------------
 mm/memory-failure.c | 14 ++++++++------
 2 files changed, 24 insertions(+), 18 deletions(-)

-- 
2.21.0