linux-kernel - Re: [kernel-hardening] Re: [RFC v4 PATCH 00/13] HARDENED

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Date:   Fri, 11 Nov 2016 15:39:05 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>
cc:     Mark Rutland <mark.rutland@....com>,
        kernel-hardening@...ts.openwall.com,
        Kees Cook <keescook@...omium.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Will Deacon <will.deacon@....com>,
        Elena Reshetova <elena.reshetova@...el.com>,
        Arnd Bergmann <arnd@...db.de>, Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <h.peter.anvin@...el.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [kernel-hardening] Re: [RFC v4 PATCH 00/13] HARDENED_ATOMIC

On Fri, 11 Nov 2016, Peter Zijlstra wrote:
> A wee bit like so...
> +
> +static inline bool refcount_sub_and_test(int i, refcount_t *r)

Why would we want to expose that at all? refcount_inc() and
refcount_dec_and_test() is what is required for refcounting.

I know there are a few users of kref_sub() in tree, but that's all
undocumented voodoo, which should not be proliferated.

Thanks,

	tglx