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SubjectRe: [RFC][PATCH] cgroup: Add new capability to allow a process to migrate other tasks between cgroups
On Tue, Oct 4, 2016 at 5:38 PM, Serge E. Hallyn <> wrote:
> Quoting John Stultz (
>> So this patch, as suggested by Tejun, simply adds a new process
>> capability flag (CAP_CGROUP_MIGRATE_TASK), and uses it when checking
> So realistically, what all can this mean? Freezing tasks, changing
> cpu/memory limits, changing network and disk throughput, forbid forking,
> and (most importantly) forbid access to certain devices.
> I think that's all ok. (And we still separately check for inode write
> perms.)

Sounds good.

> If anything I'd say the GLOBAL_ROOT_UID check could be taken out since
> otherwise a host-root task effectively cannot drop this capability.

Is this ok to leave for a separate patch?

> Acked-by: Serge Hallyn <>

Thanks for the review!

Unless there's other feedback, I'll sit on this until the merge window
is over and then resubmit for consideration for 4.10.


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