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Re: [PATCH 1/5] refcount_t: A special purpose refcount type

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On Fri, Feb 3, 2017 at 5:25 AM, Peter Zijlstra <peterz@infradead.org> wrote:
> Provide refcount_t, an atomic_t like primitive built just for
> refcounting.
>
> It provides saturation semantics such that overflow becomes impossible
> and thereby 'spurious' use-after-free is avoided.
>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> ---
>  include/linux/refcount.h |  294 +++++++++++++++++++++++++++++++++++++++++++++++
>  lib/Kconfig.debug        |   13 ++
>  2 files changed, 307 insertions(+)
>
> --- /dev/null
> +++ b/include/linux/refcount.h
> @@ -0,0 +1,294 @@
> [...]
> +#if CONFIG_DEBUG_REFCOUNT

Oh, and I just hit this too, it should be "#ifdef" ... I didn't notice
until after I sent my improvement series. Whoops. :P Yay Friday.

-Kees

-- 
Kees Cook
Pixel Security

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Thread

[PATCH 0/5] refcount_t and various related bits Peter Zijlstra <peterz@infradead.org> - 2017-02-03 14:40 +0100
  [PATCH 4/5] atomic: Introduce atomic_try_cmpxchg() Peter Zijlstra <peterz@infradead.org> - 2017-02-03 14:40 +0100
    Re: [PATCH 4/5] atomic: Introduce atomic_try_cmpxchg() Boqun Feng <boqun.feng@gmail.com> - 2017-02-06 05:30 +0100
      Re: [PATCH 4/5] atomic: Introduce atomic_try_cmpxchg() Boqun Feng <boqun.feng@gmail.com> - 2017-02-06 07:40 +0100
      Re: [PATCH 4/5] atomic: Introduce atomic_try_cmpxchg() Peter Zijlstra <peterz@infradead.org> - 2017-02-06 09:20 +0100
  [PATCH 2/5] kref: Implement using refcount_t Peter Zijlstra <peterz@infradead.org> - 2017-02-03 14:40 +0100
    Re: [PATCH 2/5] kref: Implement using refcount_t Greg KH <gregkh@linuxfoundation.org> - 2017-02-06 14:10 +0100
  [PATCH 5/5] refcount: Use atomic_try_cmpxchg() Peter Zijlstra <peterz@infradead.org> - 2017-02-03 14:40 +0100
  [PATCH 1/5] refcount_t: A special purpose refcount type Peter Zijlstra <peterz@infradead.org> - 2017-02-03 14:40 +0100
    Re: [PATCH 1/5] refcount_t: A special purpose refcount type Kees Cook <keescook@chromium.org> - 2017-02-03 19:10 +0100
    Re: [PATCH 1/5] refcount_t: A special purpose refcount type Kees Cook <keescook@chromium.org> - 2017-02-04 00:40 +0100
  [PATCH 3/5] x86: Implement __WARN using UD2 Peter Zijlstra <peterz@infradead.org> - 2017-02-03 14:40 +0100

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