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Message-ID: <alpine.DEB.2.11.1507262041590.18576@nanos>
Date: Sun, 26 Jul 2015 20:42:16 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: Vasily Kulikov <segoon@...nwall.com>
cc: linux-kernel@...r.kernel.org, Randy Dunlap <rdunlap@...radead.org>,
Andrew Morton <akpm@...ux-foundation.org>,
kernel-hardening@...ts.openwall.com,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH 2/3] use POISON_POINTER_DELTA for poison pointers
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@...nwall.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@...utronix.de>
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