[PATCH 0/5] mm: poison critical mm/ structs

[Sasha Levin <sasha.levin@oracle.com>]

Currently we're seeing a few issues which are unexplainable by looking at the
data we see and are most likely caused by a memory corruption caused
elsewhere.

This is wasting time for folks who are trying to figure out an issue provided
a stack trace that can't really point out the real issue.

This patch introduces poisoning on struct page, vm_area_struct, and mm_struct,
and places checks in busy paths to catch corruption early.

This series was tested, and it detects corruption in vm_area_struct. Right now
I'm working on figuring out the source of the corruption, (which is a long
standing bug) using KASan, but the current code is useful as it is.

Sasha Levin (5):
  mm: add poisoning basics
  mm: constify dump_page and friends
  mm: poison mm_struct
  mm: poison vm_area_struct
  mm: poison page struct

 fs/exec.c                   |  5 +++++
 include/linux/memcontrol.h  |  8 ++++----
 include/linux/mm.h          | 11 ++++++++++-
 include/linux/mm_types.h    | 18 ++++++++++++++++++
 include/linux/mmdebug.h     | 24 ++++++++++++++++++++++--
 include/linux/page-flags.h  | 24 ++++++++++++++++--------
 include/linux/page_cgroup.h |  4 ++--
 include/linux/poison.h      |  6 ++++++
 kernel/fork.c               | 13 +++++++++++++
 lib/Kconfig.debug           |  9 +++++++++
 mm/debug.c                  | 22 ++++++++++++++++++----
 mm/memcontrol.c             |  6 +++---
 mm/mmap.c                   | 21 ++++++++++++++++++++-
 mm/nommu.c                  |  7 +++++++
 mm/page_cgroup.c            |  4 ++--
 mm/vmacache.c               |  5 +++++
 16 files changed, 160 insertions(+), 27 deletions(-)

-- 
1.9.1

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