Casey Schaufler <[email protected]> writes:
> --- "Eric W. Biederman" <[email protected]> wrote:
>
>
>> My very practical question: How do I run selinux in one container,
>> and SMACK in another?
>
> How would you run PREEMPT_RT in one container, and PREEMPT_DESKTOP
> in another?
Well the style of kernel preemption is generally an implementation
detail that is not visible to user space.
> How would you run SMP in one and UP in the other?
Bind all of the UP processes to a single cpu.
> One aspect that SELinux and Smack share is that they only really
> provide security if all processes involved are under their control,
> just like the preemption behavior.
Right. But in a container that look like a full system arguably this
is doable. There are a few additional details that would be needed
to ensure containers are isolated from each other that would be
needed to ensure this is effective but those are fairly minor.
> This is not necessarily true of all possible LSMs. In that case it may
> be practicle to have different behavior for different containers.
When we get to the point where this is a real concern I believe the
isolation will be sufficient that this it is a valid question to
ask.
If there is nothing visible to user space I don't care. But security
modules are fundamentally about changing when -EPERM happens so are
very visible to user space.
Eric
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