linux-kernel - [RFC PATCH for 5.4 0/7] Membarrier fixes and cleanups

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Message-Id: <20190919173705.2181-1-mathieu.desnoyers@efficios.com>
Date:   Thu, 19 Sep 2019 13:36:58 -0400
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        "Paul E. McKenney" <paulmck@...ux.ibm.com>
Cc:     Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        Oleg Nesterov <oleg@...hat.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Chris Metcalf <cmetcalf@...hip.com>,
        Christoph Lameter <cl@...ux.com>,
        Kirill Tkhai <tkhai@...dex.ru>, Mike Galbraith <efault@....de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: [RFC PATCH for 5.4 0/7] Membarrier fixes and cleanups

Hi,

Those series of fixes and cleanups are initially motivated by the report
of race in membarrier, which can load p->mm->membarrier_state after mm
has been freed (use-after-free).

Thanks,

Mathieu

Mathieu Desnoyers (7):
  Fix: sched/membarrier: Private expedited registration check
  Cleanup: sched/membarrier: Remove redundant check
  Cleanup: sched/membarrier: Only sync_core before usermode for same mm
  Fix: sched/membarrier: p->mm->membarrier_state racy load (v4)
  selftests: sched/membarrier: Add multi-threaded test
  sched/membarrier: Skip IPIs when mm->mm_users == 1
  sched/membarrier: Return -ENOMEM to userspace on memory allocation
    failure

 fs/exec.c                                     |   2 +-
 include/linux/mm_types.h                      |  14 +-
 include/linux/sched/mm.h                      |  10 +-
 kernel/sched/core.c                           |   4 +-
 kernel/sched/membarrier.c                     | 236 +++++++++++-------
 kernel/sched/sched.h                          |  34 +++
 tools/testing/selftests/membarrier/.gitignore |   3 +-
 tools/testing/selftests/membarrier/Makefile   |   5 +-
 ...mbarrier_test.c => membarrier_test_impl.h} |  40 +--
 .../membarrier/membarrier_test_multi_thread.c |  73 ++++++
 .../membarrier_test_single_thread.c           |  24 ++
 11 files changed, 329 insertions(+), 116 deletions(-)
 rename tools/testing/selftests/membarrier/{membarrier_test.c => membarrier_test_impl.h} (95%)
 create mode 100644 tools/testing/selftests/membarrier/membarrier_test_multi_thread.c
 create mode 100644 tools/testing/selftests/membarrier/membarrier_test_single_thread.c

-- 
2.17.1