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

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Message-ID: <20170119090006.GI30786@dhcp22.suse.cz>
Date:   Thu, 19 Jan 2017 10:00:08 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Tejun Heo <tj@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...capital.net>,
        David Ahern <dsahern@...il.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Andy Lutomirski <luto@...nel.org>,
        Daniel Mack <daniel@...que.org>,
        Mickaël Salaün <mic@...ikod.net>,
        Kees Cook <keescook@...omium.org>, Jann Horn <jann@...jh.net>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Graf <tgraf@...g.ch>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Linux API <linux-api@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>
Subject: Re: Potential issues (security and otherwise) with the current
 cgroup-bpf API

On Wed 18-01-17 14:18:50, Tejun Heo wrote:
> Hello, Michal.
> 
> On Tue, Jan 17, 2017 at 02:58:30PM +0100, Michal Hocko wrote:
> > This would require using hierarchical cgroup iterators to iterate over
> 
> It does behave hierarchically.
> 
> > tasks. As per Andy's testing this doesn't seem to be the case. I haven't
> 
> That's not what Andy's testing showed.  What that showed was that
> program in a child can override the one from its ancestor.

My fault, I've misread Andy's test case. I thought that the child group
simply disabled the bpf program and the one from the parent hasn't
executed.
-- 
Michal Hocko
SUSE Labs