[PATCH v7 0/4] KASAN for arm64

[Mark Rutland]

Hi Catalin,

Can you pick up Andrey's patch below for v4.4, until we have a better
solution?

I stumbled across this myself and was about to post a similar patch.

FWIW:

Acked-by: Mark Rutland <mark.rutland at arm.com>

Thanks,
Mark.

On Tue, Nov 17, 2015 at 06:47:08PM +0300, Andrey Ryabinin wrote:
> We should either add proper Kconfig dependency for now, or just make it work.
> 
> 
> From: Andrey Ryabinin <aryabinin at virtuozzo.com>
> Subject: [PATCH] arm64: KASAN depends on !(ARM64_16K_PAGES && ARM64_VA_BITS_48)
> 
> On KASAN + 16K_PAGES + 48BIT_VA
>  arch/arm64/mm/kasan_init.c: In function ‘kasan_early_init’:
>  include/linux/compiler.h:484:38: error: call to ‘__compiletime_assert_95’ declared with attribute error: BUILD_BUG_ON failed: !IS_ALIGNED(KASAN_SHADOW_END, PGDIR_SIZE)
>     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
> 
> Currently KASAN will not work on 16K_PAGES and 48BIT_VA, so
> forbid such configuration to avoid above build failure.
> 
> Reported-by: Suzuki K. Poulose <Suzuki.Poulose at arm.com>
> Signed-off-by: Andrey Ryabinin <aryabinin at virtuozzo.com>
> ---
>  arch/arm64/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 9ac16a4..bf7de69 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -49,7 +49,7 @@ config ARM64
>  	select HAVE_ARCH_AUDITSYSCALL
>  	select HAVE_ARCH_BITREVERSE
>  	select HAVE_ARCH_JUMP_LABEL
> -	select HAVE_ARCH_KASAN if SPARSEMEM_VMEMMAP
> +	select HAVE_ARCH_KASAN if SPARSEMEM_VMEMMAP && !(ARM64_16K_PAGES && ARM64_VA_BITS_48)
>  	select HAVE_ARCH_KGDB
>  	select HAVE_ARCH_SECCOMP_FILTER
>  	select HAVE_ARCH_TRACEHOOK
> -- 
> 2.4.10
> 
> 
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