Re: Potential issues (security and otherwise) with the current cgroup-bpf API

[Andy Lutomirski]

On Mon, Dec 19, 2016 at 8:51 PM, Alexei Starovoitov
<alexei.starovoitov@xxxxxxxxx> wrote:
> On Mon, Dec 19, 2016 at 05:40:53PM -0800, Andy Lutomirski wrote:
>>
>> By the way, even if Alexei is right, the BPF_PROG_DETACH API doesn't
>> even take a reference to a BPF program as an argument.  What is it
>> supposed to do if this mechanism ever gets extended?
>
> we just add another field to that anonymous union just like
> we did for other commands and everything is backwards compatible.
> It's the basics of bpf syscall that we've been relying on for some
> time now and it worked just fine.

And what happens if you don't specify that member and two programs are attached?

--Andy