linux-kernel - [PATCH 0/5] mm subsystem refcounter conversions

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Date:   Tue, 21 Feb 2017 11:58:39 +0200
From:   Elena Reshetova <elena.reshetova@...el.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, peterz@...radead.org,
        gregkh@...uxfoundation.org, viro@...iv.linux.org.uk,
        catalin.marinas@....com, mingo@...hat.com,
        akpm@...ux-foundation.org, arnd@...db.de, luto@...nel.org,
        Elena Reshetova <elena.reshetova@...el.com>
Subject: [PATCH 0/5] mm subsystem refcounter conversions

v2:
 - incorporated fixes reported 0day CI

Now when new refcount_t type and API are finally merged
(see include/linux/refcount.h), the following
patches convert various refcounters in the mm susystem from atomic_t
to refcount_t. By doing this we prevent intentional or accidental
underflows or overflows that can led to use-after-free vulnerabilities.

The below patches are fully independent and can be cherry-picked separately.
Since we convert all kernel subsystems in the same fashion, resulting
in about 300 patches, we have to group them for sending at least in some
fashion to be manageable. Please excuse the long cc list.

Elena Reshetova (5):
  mm: convert bdi_writeback_congested.refcnt from atomic_t to refcount_t
  mm: convert anon_vma.refcount from atomic_t to refcount_t
  mm: convert kmemleak_object.use_count from atomic_t to refcount_t
  mm: convert mm_struct.mm_users from atomic_t to refcount_t
  mm: convert mm_struct.mm_count from atomic_t to refcount_t

 arch/alpha/kernel/smp.c                  |  6 +++---
 arch/arc/mm/tlb.c                        |  2 +-
 arch/blackfin/mach-common/smp.c          |  4 ++--
 arch/ia64/include/asm/tlbflush.h         |  2 +-
 arch/ia64/kernel/smp.c                   |  2 +-
 arch/ia64/sn/kernel/sn2/sn2_smp.c        |  4 ++--
 arch/mips/kernel/process.c               |  2 +-
 arch/mips/kernel/smp.c                   |  6 +++---
 arch/parisc/include/asm/mmu_context.h    |  2 +-
 arch/powerpc/mm/hugetlbpage.c            |  2 +-
 arch/powerpc/mm/icswx.c                  |  4 ++--
 arch/sh/kernel/smp.c                     |  6 +++---
 arch/sparc/kernel/smp_64.c               |  6 +++---
 arch/sparc/mm/srmmu.c                    |  2 +-
 arch/um/kernel/tlb.c                     |  2 +-
 arch/x86/kernel/tboot.c                  |  4 ++--
 drivers/firmware/efi/arm-runtime.c       |  4 ++--
 drivers/gpu/drm/amd/amdkfd/kfd_process.c |  2 +-
 fs/coredump.c                            |  2 +-
 fs/proc/base.c                           |  2 +-
 fs/userfaultfd.c                         |  3 +--
 include/linux/backing-dev-defs.h         |  3 ++-
 include/linux/backing-dev.h              |  4 ++--
 include/linux/mm_types.h                 |  5 +++--
 include/linux/rmap.h                     |  7 ++++---
 include/linux/sched.h                    | 10 +++++-----
 kernel/events/uprobes.c                  |  2 +-
 kernel/exit.c                            |  2 +-
 kernel/fork.c                            | 12 ++++++------
 kernel/sched/core.c                      |  2 +-
 lib/is_single_threaded.c                 |  2 +-
 mm/backing-dev.c                         | 13 +++++++------
 mm/debug.c                               |  4 ++--
 mm/init-mm.c                             |  4 ++--
 mm/khugepaged.c                          |  2 +-
 mm/kmemleak.c                            | 16 ++++++++--------
 mm/ksm.c                                 |  2 +-
 mm/memory.c                              |  2 +-
 mm/mmu_notifier.c                        | 10 +++++-----
 mm/mprotect.c                            |  2 +-
 mm/oom_kill.c                            |  2 +-
 mm/rmap.c                                | 14 +++++++-------
 mm/swapfile.c                            |  2 +-
 mm/vmacache.c                            |  2 +-
 44 files changed, 98 insertions(+), 95 deletions(-)

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2.7.4