linux-kernel - [PATCHv2 0/2] Fix crash due to vma_is

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Message-Id: <20180712145626.41665-1-kirill.shutemov@linux.intel.com>
Date:   Thu, 12 Jul 2018 17:56:24 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCHv2 0/2] Fix crash due to vma_is_anonymous() false-positives


Fix crash found by syzkaller.

The fix allows to remove ->vm_ops checks.

v2:
 - Catch few more cases where we need to initialize ->vm_ops:
   + nommu;
   + ia64;
 - Make sure that we initialize ->vm_ops even if ->mmap failed.
   We need ->vm_ops in error path too.

Kirill A. Shutemov (2):
  mm: Fix vma_is_anonymous() false-positives
  mm: Drop unneeded ->vm_ops checks

 arch/ia64/kernel/perfmon.c |  1 +
 arch/ia64/mm/init.c        |  2 ++
 drivers/char/mem.c         |  1 +
 fs/binfmt_elf.c            |  2 +-
 fs/exec.c                  |  1 +
 fs/hugetlbfs/inode.c       |  1 +
 fs/kernfs/file.c           | 20 +-------------------
 fs/proc/task_mmu.c         |  2 +-
 include/linux/mm.h         |  5 ++++-
 kernel/events/core.c       |  2 +-
 kernel/fork.c              |  2 +-
 mm/gup.c                   |  2 +-
 mm/hugetlb.c               |  2 +-
 mm/khugepaged.c            |  4 ++--
 mm/memory.c                | 12 ++++++------
 mm/mempolicy.c             | 10 +++++-----
 mm/mmap.c                  | 25 ++++++++++++++++++-------
 mm/mremap.c                |  2 +-
 mm/nommu.c                 | 13 ++++++++++---
 mm/shmem.c                 |  1 +
 mm/util.c                  | 12 ++++++++++++
 21 files changed, 72 insertions(+), 50 deletions(-)

-- 
2.18.0