Groups > linux.kernel > #1192539

Re: [PATCH 2/3] use POISON_POINTER_DELTA for poison pointers

From	Thomas Gleixner <tglx@linutronix.de>
Newsgroups	linux.kernel
Subject	Re: [PATCH 2/3] use POISON_POINTER_DELTA for poison pointers
Date	2015-07-26 20:50 +0200
Message-ID	<pQz9M-2Vx-9@gated-at.bofh.it> (permalink)
References	<pQuts-4EO-11@gated-at.bofh.it> <pQuts-4EO-15@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Sun, 26 Jul 2015, Vasily Kulikov wrote:
> TIMER_ENTRY_STATIC and TAIL_MAPPING are defined as poison pointers which
> should point to nowhere.  Redefine them using POISON_POINTER_DELTA arithmetics
> to make sure they really point to non-mappable area declared by the
> target architecture.
> 
> Signed-off-by: Vasily Kulikov <segoon@openwall.com> 
> ---
>  include/linux/poison.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/poison.h b/include/linux/poison.h
> index ee697b9..a721bcd 100644
> --- a/include/linux/poison.h
> +++ b/include/linux/poison.h
> @@ -27,14 +27,14 @@
>   * Magic number "tsta" to indicate a static timer initializer
>   * for the object debugging code.
>   */
> -#define TIMER_ENTRY_STATIC	((void *) 0x74737461)
> +#define TIMER_ENTRY_STATIC	((void *) 0x300 + POISON_POINTER_DELTA)

Acked-by: Thomas Gleixner <tglx@linutronix.de>
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Re: [PATCH 2/3] use POISON_POINTER_DELTA for poison pointers Thomas Gleixner <tglx@linutronix.de> - 2015-07-26 20:50 +0200

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