Subject: [RFC/PATCH RESEND -next 01/21] Add kernel address sanitizer infrastructure.

From: [email-masked] (Dave Hansen)
Date: Wed, 09 Jul 2014 13:26:16 -0700

On 07/09/2014 04:29 AM, Andrey Ryabinin wrote:
> Address sanitizer dedicates 1/8 of the low memory to the shadow memory and uses direct
> mapping with a scale and offset to translate a memory address to its corresponding
> shadow address.
> 
> Here is function to translate address to corresponding shadow address:
> 
>      unsigned long kasan_mem_to_shadow(unsigned long addr)
>      {
>                 return ((addr - PAGE_OFFSET) >> KASAN_SHADOW_SCALE_SHIFT)
>                              + kasan_shadow_start;
>      }

How does this interact with vmalloc() addresses or those from a kmap()?