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SubjectRe: [RFC/PATCH -next 00/21] Address sanitizer for kernel (kasan) - dynamic memory error detector.
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



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