Messages in this thread | | | From | (Eric W. Biederman) | Date | Thu, 22 Oct 2015 14:35:14 -0500 | Subject | Re: [PATCH net-next 3/4] bpf: add support for persistent maps/progs |
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Daniel Borkmann <daniel@iogearbox.net> writes:
> On 10/20/2015 08:56 PM, Eric W. Biederman wrote: > ... >> Just FYI: Using a device for this kind of interface is pretty >> much a non-starter as that quickly gets you into situations where >> things do not work in containers. If someone gets a version of device >> namespaces past GregKH it might be up for discussion to use character >> devices. > > Okay, you are referring to this discussion here: > > http://thread.gmane.org/gmane.linux.kernel.containers/26760
That is a piece of it. It is an old old discussion (which generally has been handled poorly). For the forseeable future device namespaces have a firm NACK by GregKH. Which means that dynamic character device based interfaces do not work in containers. Which means if you are not talking about physical hardware, character devices are a poor fit.
Making a character based interface for eBPF not workable.
Eric
p.s. There are plenty of reasons (even if privilege remains a requirement) to ask how can this functionality be used in a container. If for no other reason than sandboxing privileged applications is typically a good idea.
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