Re: [PATCH v8 -tip 13/26] kernel/entry: Add support for core-wide protection of kernel-mode

[Randy Dunlap]

On 10/19/20 6:43 PM, Joel Fernandes (Google) wrote:
> ---
>   .../admin-guide/kernel-parameters.txt         |   7 +
>   include/linux/entry-common.h                  |   2 +-
>   include/linux/sched.h                         |  12 +
>   kernel/entry/common.c                         |  25 +-
>   kernel/sched/core.c                           | 229 ++++++++++++++++++
>   kernel/sched/sched.h                          |   3 +
>   6 files changed, 275 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 3236427e2215..48567110f709 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -4678,6 +4678,13 @@
>   
>   	sbni=		[NET] Granch SBNI12 leased line adapter
>   
> +	sched_core_protect_kernel=

Needs a list of possible values after '=', along with telling us
what the default value/setting is.


> +			[SCHED_CORE] Pause SMT siblings of a core running in
> +			user mode, if at least one of the siblings of the core
> +			is running in kernel mode. This is to guarantee that
> +			kernel data is not leaked to tasks which are not trusted
> +			by the kernel.
> +


thanks.