Re: [PATCH v10 08/22] kasan, arm64: untag address in __kimg_to_phys and _virt_addr_is_linear

[Catalin Marinas]

On Tue, Nov 06, 2018 at 06:30:23PM +0100, Andrey Konovalov wrote:
> --- a/arch/arm64/include/asm/memory.h
> +++ b/arch/arm64/include/asm/memory.h
> @@ -92,6 +92,15 @@
>  #define KASAN_THREAD_SHIFT	0
>  #endif
>  
> +#ifdef CONFIG_KASAN_SW_TAGS
> +#define KASAN_TAG_SHIFTED(tag)		((unsigned long)(tag) << 56)
> +#define KASAN_SET_TAG(addr, tag)	(((addr) & ~KASAN_TAG_SHIFTED(0xff)) | \
> +						KASAN_TAG_SHIFTED(tag))
> +#define KASAN_RESET_TAG(addr)		KASAN_SET_TAG(addr, 0xff)
> +#else
> +#define KASAN_RESET_TAG(addr)		addr
> +#endif

I think we should reuse the untagged_addr() macro we have in uaccess.h
(make it more general and move to another header file).

-- 
Catalin