2014-07-12 4:59 GMT+04:00 H. Peter Anvin <h...@zytor.com>: > 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? >
Sparsemem configurations currently may not work with kasan. I suppose I will have to move shadow area to vmalloc address space and make it (shadow) sparse too if needed. > -hpa > > -- > To unsubscribe, send a message with 'unsubscribe linux-mm' in > the body to majord...@kvack.org. For more info on Linux MM, > see: http://www.linux-mm.org/ . > Don't email: <a href=mailto:"d...@kvack.org"> em...@kvack.org </a> -- Best regards, Andrey Ryabinin -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/