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Message-ID: <20180306224636.wf5z3kujtc7r5qyh@cisco>
Date: Tue, 6 Mar 2018 15:46:36 -0700
From: Tycho Andersen <tycho@...ho.ws>
To: Andy Lutomirski <luto@...capital.net>
Cc: Mickaël Salaün <mic@...ikod.net>,
LKML <linux-kernel@...r.kernel.org>,
Alexei Starovoitov <ast@...nel.org>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Casey Schaufler <casey@...aufler-ca.com>,
Daniel Borkmann <daniel@...earbox.net>,
David Drysdale <drysdale@...gle.com>,
"David S . Miller" <davem@...emloft.net>,
"Eric W . Biederman" <ebiederm@...ssion.com>,
James Morris <james.l.morris@...cle.com>,
Jann Horn <jann@...jh.net>, Jonathan Corbet <corbet@....net>,
Michael Kerrisk <mtk.manpages@...il.com>,
Kees Cook <keescook@...omium.org>, Paul Moore <paul@...l-moore.com>,
Sargun Dhillon <sargun@...gun.me>,
"Serge E . Hallyn" <serge@...lyn.com>,
Shuah Khan <shuah@...nel.org>, Tejun Heo <tj@...nel.org>,
Thomas Graf <tgraf@...g.ch>, Will Drewry <wad@...omium.org>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
Linux API <linux-api@...r.kernel.org>,
LSM List <linux-security-module@...r.kernel.org>,
Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH bpf-next v8 00/11] Landlock LSM: Toward unprivileged
sandboxing
On Tue, Mar 06, 2018 at 10:33:17PM +0000, Andy Lutomirski wrote:
> >> Suppose I'm writing a container manager. I want to run "mount" in the
> >> container, but I don't want to allow moun() in general and I want to
> >> emulate certain mount() actions. I can write a filter that catches
> >> mount using seccomp and calls out to the container manager for help.
> >> This isn't theoretical -- Tycho wants *exactly* this use case to be
> >> supported.
> >
> > Well, I think this use case should be handled with something like
> > LD_PRELOAD and a helper library. FYI, I did something like this:
> > https://github.com/stemjail/stemshim
>
> I doubt that will work for containers. Containers that use user
> namespaces and, for example, setuid programs aren't going to honor
> LD_PRELOAD.
Or anything that calls syscalls directly, like go programs.
Tycho
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