Re: [OS-BUILD PATCH] redhat/configs: Use SHA512 for module signing

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On Tue, Jun 16, 2020 at 11:47:20PM -0000, GitLab Bridge on behalf of prarit wrote:
> From: Prarit Bhargava <prarit@xxxxxxxxxx>
> 
> kernsec.org recommends using SHA512 [1] for kernel module signing.  There
> isn't any reason not to do this and the benefit is a stronger module
> hash.
> 
> [1] https://kernsec.org/wiki/index.php/Kernel_Self_Protection_Project/Recommended_Settings
> 
> Signed-off-by: Prarit Bhargava <prarit@xxxxxxxxxx>
> ---
>  redhat/configs/ark/generic/CONFIG_CRYPTO_SHA512                | 2 +-
>  redhat/configs/ark/generic/s390x/zfcpdump/CONFIG_CRYPTO_SHA512 | 1 -
>  redhat/configs/common/generic/CONFIG_IMA_DEFAULT_HASH_SHA512   | 1 +
>  redhat/configs/common/generic/CONFIG_MODULE_SIG_SHA256         | 2 +-
>  redhat/configs/common/generic/CONFIG_MODULE_SIG_SHA512         | 2 +-
>  redhat/configs/fedora/generic/CONFIG_CRYPTO_SHA512             | 1 -
>  6 files changed, 4 insertions(+), 5 deletions(-)
>  delete mode 100644 redhat/configs/ark/generic/s390x/zfcpdump/CONFIG_CRYPTO_SHA512
>  create mode 100644 redhat/configs/common/generic/CONFIG_IMA_DEFAULT_HASH_SHA512
>  delete mode 100644 redhat/configs/fedora/generic/CONFIG_CRYPTO_SHA512

Does arch/s390/configs/debug_defconfig need to be updated as well to
remove CONFIG_MODULE_SIG_SHA256? Based on my interpretation of the
definition of MODULE_SIG_HASH in init/Kconfig, it looks like SHA256
will still be used for that kernel.

Brian


> 
> diff --git a/redhat/configs/ark/generic/CONFIG_CRYPTO_SHA512 b/redhat/configs/ark/generic/CONFIG_CRYPTO_SHA512
> index 29ce3726bd4a..5c25197e538b 100644
> --- a/redhat/configs/ark/generic/CONFIG_CRYPTO_SHA512
> +++ b/redhat/configs/ark/generic/CONFIG_CRYPTO_SHA512
> @@ -1 +1 @@
> -CONFIG_CRYPTO_SHA512=m
> +CONFIG_CRYPTO_SHA512=y
> diff --git a/redhat/configs/ark/generic/s390x/zfcpdump/CONFIG_CRYPTO_SHA512 b/redhat/configs/ark/generic/s390x/zfcpdump/CONFIG_CRYPTO_SHA512
> deleted file mode 100644
> index 5c25197e538b..000000000000
> --- a/redhat/configs/ark/generic/s390x/zfcpdump/CONFIG_CRYPTO_SHA512
> +++ /dev/null
> @@ -1 +0,0 @@
> -CONFIG_CRYPTO_SHA512=y
> diff --git a/redhat/configs/common/generic/CONFIG_IMA_DEFAULT_HASH_SHA512 b/redhat/configs/common/generic/CONFIG_IMA_DEFAULT_HASH_SHA512
> new file mode 100644
> index 000000000000..63c78568591f
> --- /dev/null
> +++ b/redhat/configs/common/generic/CONFIG_IMA_DEFAULT_HASH_SHA512
> @@ -0,0 +1 @@
> +# CONFIG_IMA_DEFAULT_HASH_SHA512 is not set
> diff --git a/redhat/configs/common/generic/CONFIG_MODULE_SIG_SHA256 b/redhat/configs/common/generic/CONFIG_MODULE_SIG_SHA256
> index b350aa05ab58..f54169c568b1 100644
> --- a/redhat/configs/common/generic/CONFIG_MODULE_SIG_SHA256
> +++ b/redhat/configs/common/generic/CONFIG_MODULE_SIG_SHA256
> @@ -1 +1 @@
> -CONFIG_MODULE_SIG_SHA256=y
> +# CONFIG_MODULE_SIG_SHA256 is not set
> diff --git a/redhat/configs/common/generic/CONFIG_MODULE_SIG_SHA512 b/redhat/configs/common/generic/CONFIG_MODULE_SIG_SHA512
> index 2910d833029c..fe14d3f42285 100644
> --- a/redhat/configs/common/generic/CONFIG_MODULE_SIG_SHA512
> +++ b/redhat/configs/common/generic/CONFIG_MODULE_SIG_SHA512
> @@ -1 +1 @@
> -# CONFIG_MODULE_SIG_SHA512 is not set
> +CONFIG_MODULE_SIG_SHA512=y
> diff --git a/redhat/configs/fedora/generic/CONFIG_CRYPTO_SHA512 b/redhat/configs/fedora/generic/CONFIG_CRYPTO_SHA512
> deleted file mode 100644
> index 5c25197e538b..000000000000
> --- a/redhat/configs/fedora/generic/CONFIG_CRYPTO_SHA512
> +++ /dev/null
> @@ -1 +0,0 @@
> -CONFIG_CRYPTO_SHA512=y
> -- 

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