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SubjectRe: [RFC] cgroups: implement device whitelist lsm (v2)
On Wed, Mar 12, 2008 at 8:27 PM, Serge E. Hallyn <serue@us.ibm.com> wrote:
>
> While composing this with the ns_cgroup may seem logical, it is not
> the right thing to do, because updates to /cg/cg1/devcg.deny are
> not reflected in /cg/cg1/cg2/devcg.allow.

Maybe you should follow up the tree to ensure that all parent groups
have access to the device too? Or alternatively, cache the results of
this lookup whenever permissions for a device change?

>
> A task may only be moved to another devcgroup if it is moving to
> a direct descendent of its current devcgroup.

What's the rationale for that?

>
> CAP_NS_OVERRIDE is defined as the capability needed to cross namespaces.
> A task needs both CAP_NS_OVERRIDE and CAP_SYS_ADMIN to create a new
> devcgroup, update a devcgroup's access, or move a task to a new
> devcgroup.

But this isn't necessarily crossing namespaces. It could be used for
device control in the same namespace (e.g. allowing a job to access a
raw disk for its data storage rather than going through the
filesystem).

Paul


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