Re: [PATCH v4 3/5] LSM: Security module checking for side-channel dangers

[Jann Horn]

On Sat, Aug 25, 2018 at 12:42 AM Casey Schaufler
<casey.schaufler@xxxxxxxxx> wrote:
> +config SECURITY_SIDECHANNEL_CAPABILITIES
> +       bool "Sidechannel check on capability sets"
> +       depends on SECURITY_SIDECHANNEL
> +       depends on !SECURITY_SIDECHANNEL_ALWAYS
> +       default n
> +       select SECURITY_SIDECHANNEL_NAMESPACES if USER_NS
> +       help
> +         Assume that tasks with different sets of privilege may be
> +         subject to side-channel attacks. Potential interactions
> +         where the attacker lacks capabilities the attacked has
> +         are blocked. Selecting this when user namespaces (USER_NS)
> +         are enabled will enable SECURITY_SIDECHANNEL_NAMESPACES.

Thanks!