On 07/09/2014 04:00 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) >> KASAN_SHADOW_SCALE_SHIFT)
> + kasan_shadow_start - (PAGE_OFFSET >>
> KASAN_SHADOW_SCALE_SHIFT);
> }
>
> where KASAN_SHADOW_SCALE_SHIFT = 3.
>
How does that work when memory is sparsely populated?
-hpa
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
