[PATCH 0/3] v2 ipc subsystem refcount coversions

[Elena Reshetova]

Changes in v2:
 * add a new patch on kern_ipc_perm.refcount
 * drop the patch on ipc_rcu.refcount
 * rebase on top of linux-next/master
 * Now by default refcount_t = atomic_t (*) and uses all atomic
   standard operations unless CONFIG_REFCOUNT_FULL is enabled.
   This is a compromise for the systems that are critical on
   performance (such as net) and cannot accept even slight delay
   on the refcounter operations.

This series, for ipc subsystem components, 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 led to use-after-free vulnerabilities.

The patches are fully independent and can be cherry-picked separately.
If there are no objections to the patches, please merge them via respective trees.

* The respective change is currently merged into -next as
  "locking/refcount: Create unchecked atomic_t implementation".

Elena Reshetova (3):
  ipc: convert ipc_namespace.count from atomic_t to refcount_t
  ipc: convert sem_undo_list.refcnt from atomic_t to refcount_t
  ipc: convert kern_ipc_perm.refcount from atomic_t to refcount_t

 include/linux/ipc.h           | 3 ++-
 include/linux/ipc_namespace.h | 5 +++--
 ipc/msgutil.c                 | 2 +-
 ipc/namespace.c               | 4 ++--
 ipc/sem.c                     | 8 ++++----
 ipc/util.c                    | 6 +++---
 6 files changed, 15 insertions(+), 13 deletions(-)

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2.7.4