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Message-ID: <CAGXu5jKuhQE7wX9cMt0ZkUdswCGhJc9sm-6CiXg+ysx=aebV8A@mail.gmail.com>
Date: Fri, 3 Feb 2017 15:37:35 -0800
From: Kees Cook <keescook@...omium.org>
To: Peter Zijlstra <peterz@...radead.org>
Cc: "Reshetova, Elena" <elena.reshetova@...el.com>, Greg KH <gregkh@...uxfoundation.org>,
Arnd Bergmann <arnd@...db.de>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...nel.org>,
"H. Peter Anvin" <h.peter.anvin@...el.com>, Will Deacon <will.deacon@....com>,
David Windsor <dwindsor@...il.com>, David Howells <dhowells@...hat.com>,
LKML <linux-kernel@...r.kernel.org>,
"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH 1/5] refcount_t: A special purpose refcount type
On Fri, Feb 3, 2017 at 5:25 AM, Peter Zijlstra <peterz@...radead.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@...radead.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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