linux-kernel - [PATCH 0/3] v2 ipc subsystem refcount coversions

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Date:   Fri,  7 Jul 2017 11:59:49 +0300
From:   Elena Reshetova <elena.reshetova@...el.com>
To:     linux-kernel@...r.kernel.org
Cc:     peterz@...radead.org, gregkh@...uxfoundation.org,
        akpm@...ux-foundation.org, ebiederm@...ssion.com, mingo@...hat.com,
        adobriyan@...il.com, serge@...lyn.com, arozansk@...hat.com,
        dave@...olabs.net, keescook@...omium.org,
        Elena Reshetova <elena.reshetova@...el.com>
Subject: [PATCH 0/3]  v2 ipc subsystem refcount coversions

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(-)

-- 
2.7.4