[PATCH 7/9] powerpc/configs/skiroot: Enable security features

[Daniel Axtens]

Michael Ellerman <mpe at ellerman.id.au> writes:

> From: Joel Stanley <joel at jms.id.au>
>
> This turns on HARDENED_USERCOPY with HARDENED_USERCOPY_PAGESPAN, and
> FORTIFY_SOURCE.
>
> It also enables SECURITY_LOCKDOWN_LSM with _EARLY and
> LOCK_DOWN_KERNEL_FORCE_CONFIDENTIALITY options enabled.
>

As I said before, this will disable xmon entirely. If we want to set
this, we should compile out xmon. But if we want xmon in read-only mode
to be an option, we should pick integrity mode.

I don't really mind, because I don't work with skiroot very
much. Oliver, Joel, Nayna, you all do stuff around this sort of level -
is this a problem for any of you?

Regards,
Daniel

> MODULE_SIG is selected by lockdown, so it is still enabled.
>
> Signed-off-by: Joel Stanley <joel at jms.id.au>
> Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
> ---
>  arch/powerpc/configs/skiroot_defconfig | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/configs/skiroot_defconfig b/arch/powerpc/configs/skiroot_defconfig
> index 24a210fe0049..bd661a9a9410 100644
> --- a/arch/powerpc/configs/skiroot_defconfig
> +++ b/arch/powerpc/configs/skiroot_defconfig
> @@ -49,7 +49,6 @@ CONFIG_JUMP_LABEL=y
>  CONFIG_STRICT_KERNEL_RWX=y
>  CONFIG_MODULES=y
>  CONFIG_MODULE_UNLOAD=y
> -CONFIG_MODULE_SIG=y
>  CONFIG_MODULE_SIG_FORCE=y
>  CONFIG_MODULE_SIG_SHA512=y
>  CONFIG_PARTITION_ADVANCED=y
> @@ -272,6 +271,16 @@ CONFIG_NLS_ASCII=y
>  CONFIG_NLS_ISO8859_1=y
>  CONFIG_NLS_UTF8=y
>  CONFIG_ENCRYPTED_KEYS=y
> +CONFIG_SECURITY=y
> +CONFIG_HARDENED_USERCOPY=y
> +# CONFIG_HARDENED_USERCOPY_FALLBACK is not set
> +CONFIG_HARDENED_USERCOPY_PAGESPAN=y
> +CONFIG_FORTIFY_SOURCE=y
> +CONFIG_SECURITY_LOCKDOWN_LSM=y
> +CONFIG_SECURITY_LOCKDOWN_LSM_EARLY=y
> +CONFIG_LOCK_DOWN_KERNEL_FORCE_CONFIDENTIALITY=y
> +# CONFIG_INTEGRITY is not set
> +CONFIG_LSM="yama,loadpin,safesetid,integrity"
>  # CONFIG_CRYPTO_HW is not set
>  CONFIG_CRC16=y
>  CONFIG_CRC_ITU_T=y
> -- 
> 2.21.1