Re: [PATCH v1] cgroup,bpf: Add access check for cgroup_get_from_fd()

From: Tejun Heo
Date: Tue Sep 20 2016 - 09:53:31 EST


On Tue, Sep 20, 2016 at 12:49:13AM +0200, Mickaël Salaün wrote:
> Add security access check for cgroup backed FD. The "cgroup.procs" file
> of the corresponding cgroup should be readable to identify the cgroup,
> and writable to prove that the current process can manage this cgroup
> (e.g. through delegation). This is similar to the check done by
> cgroup_procs_write_permission().

Can you please explain why this change is beneficial?