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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