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SubjectRe: [RFC/PATCH RESEND -next 01/21] Add kernel address sanitizer infrastructure.
On Wed, 9 Jul 2014, Andrey Ryabinin wrote:

> +
> +Markers of unaccessible bytes could be found in mm/kasan/kasan.h header:
> +
> +#define KASAN_FREE_PAGE 0xFF /* page was freed */
> +#define KASAN_PAGE_REDZONE 0xFE /* redzone for kmalloc_large allocations */
> +#define KASAN_SLAB_REDZONE 0xFD /* Slab page redzone, does not belong to any slub object */

We call these zones "PADDING". Redzones are associated with an object.
Padding is there because bytes are left over, unusable or necessary for

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