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()?