linux-kernel - [PATCH 0/5] v3 block subsystem refcounter conversions

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Date:   Tue, 27 Jun 2017 14:39:55 +0300
From:   Elena Reshetova <elena.reshetova@...el.com>
To:     axboe@...nel.dk
Cc:     james.bottomley@...senpartnership.com,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-btrfs@...r.kernel.org,
        peterz@...radead.org, gregkh@...uxfoundation.org,
        keescook@...omium.org, fujita.tomonori@....ntt.co.jp,
        mingo@...hat.com, clm@...com, jbacik@...com, dsterba@...e.com,
        Elena Reshetova <elena.reshetova@...el.com>
Subject: [PATCH 0/5] v3 block subsystem refcounter conversions

Changes in v3:
No changes in patches apart from trivial rebases, but now by
default refcount_t = atomic_t and uses all atomic standard operations
unless CONFIG_REFCOUNT_FULL is enabled. This is a compromize for the
systems that are critical on performance and cannot accept even
slight delay on the refcounter operations.

Changes in v2:
Not needed WARNs are removed since refcount_t warns by itself.
BUG_ONs are left as it is, since refcount_t doesn't bug by default.

This series, for block subsystem, replaces atomic_t reference
counters with the new refcount_t type and API (see include/linux/refcount.h).
By doing this we prevent intentional or accidental
underflows or overflows that can lead to use-after-free vulnerabilities.

Elena Reshetova (5):
  block: convert bio.__bi_cnt from atomic_t to refcount_t
  block: convert blk_queue_tag.refcnt from atomic_t to refcount_t
  block: convert blkcg_gq.refcnt from atomic_t to refcount_t
  block: convert io_context.active_ref from atomic_t to refcount_t
  block: convert bsg_device.ref_count from atomic_t to refcount_t

 block/bfq-iosched.c        | 2 +-
 block/bio.c                | 6 +++---
 block/blk-cgroup.c         | 2 +-
 block/blk-ioc.c            | 4 ++--
 block/blk-tag.c            | 8 ++++----
 block/bsg.c                | 9 +++++----
 block/cfq-iosched.c        | 4 ++--
 fs/btrfs/volumes.c         | 2 +-
 include/linux/bio.h        | 4 ++--
 include/linux/blk-cgroup.h | 9 ++++-----
 include/linux/blk_types.h  | 3 ++-
 include/linux/blkdev.h     | 3 ++-
 include/linux/iocontext.h  | 6 +++---
 13 files changed, 32 insertions(+), 30 deletions(-)

-- 
2.7.4