Re: [PATCH] Kconfig: Make STRICT_DEVMEM default-y on x86 and arm64

[Laura Abbott]

On 12/01/2017 12:10 PM, Kees Cook wrote:
> Distros have been shipping with CONFIG_STRICT_DEVMEM=y for years now. It
> is probably time to flip this default for x86 and arm64.

With my Fedora hat on,

Acked-by: Laura Abbott <labbott@xxxxxxxxxx

> Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
> ---
>   lib/Kconfig.debug | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index 947d3e2ed5c2..39b123d04a36 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -1985,7 +1985,7 @@ config STRICT_DEVMEM
>   	bool "Filter access to /dev/mem"
>   	depends on MMU && DEVMEM
>   	depends on ARCH_HAS_DEVMEM_IS_ALLOWED
> -	default y if TILE || PPC
> +	default y if TILE || PPC || X86 || ARM64
>   	---help---
>   	  If this option is disabled, you allow userspace (root) access to all
>   	  of memory, including kernel and userspace memory. Accidental