netdev - Re: [PATCH bpf-next v8 00/11] Landlock LSM: Toward unprivileged sandboxing

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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