linux-kernel - Re: [PATCH] x86/refcount: Implement fast refcount

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Date:   Mon, 24 Apr 2017 12:48:53 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     linux-kernel@...r.kernel.org, Eric Biggers <ebiggers3@...il.com>,
        Christoph Hellwig <hch@...radead.org>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        Elena Reshetova <elena.reshetova@...el.com>,
        Hans Liljestrand <ishkamiel@...il.com>,
        David Windsor <dwindsor@...il.com>, x86@...nel.org,
        Ingo Molnar <mingo@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jann Horn <jann@...jh.net>, davem@...emloft.net,
        linux-arch@...r.kernel.org, kernel-hardening@...ts.openwall.com,
        PaX Team <pageexec@...email.hu>
Subject: Re: [PATCH] x86/refcount: Implement fast refcount_t handling

On Fri, Apr 21, 2017 at 03:09:39PM -0700, Kees Cook wrote:
> diff --git a/drivers/misc/lkdtm_bugs.c b/drivers/misc/lkdtm_bugs.c
> index e3f4cd8876b5..1bdafb29b802 100644
> --- a/drivers/misc/lkdtm_bugs.c
> +++ b/drivers/misc/lkdtm_bugs.c
> @@ -135,9 +135,15 @@ void lkdtm_HUNG_TASK(void)
>  	schedule();
>  }
>  
> +#ifdef CONFIG_FAST_REFCOUNT
> +#define REFCOUNT_MAX	INT_MAX
> +#else
> +#define REFCOUNT_MAX	UINT_MAX
> +#endif

That doesn't seem like a sensible place for this.