linux-kernel - Re: [PATCH bpf-next v8 05/11] seccomp,landlock: Enforce Landlock programs per process hierarchy

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Message-ID: <b9579dae-625e-cd91-0656-821a8d1f2893@schaufler-ca.com>
Date:   Tue, 27 Feb 2018 09:30:35 -0800
From:   Casey Schaufler <casey@...aufler-ca.com>
To:     Andy Lutomirski <luto@...nel.org>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Mickaël Salaün <mic@...ikod.net>,
        LKML <linux-kernel@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        David Drysdale <drysdale@...gle.com>,
        "David S . Miller" <davem@...emloft.net>,
        "Eric W . Biederman" <ebiederm@...ssion.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>, Tycho Andersen <tycho@...ho.ws>,
        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>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH bpf-next v8 05/11] seccomp,landlock: Enforce Landlock
 programs per process hierarchy

On 2/27/2018 8:39 AM, Andy Lutomirski wrote:
> On Tue, Feb 27, 2018 at 5:32 AM, Alexei Starovoitov
> <alexei.starovoitov@...il.com> wrote:
>> [ Snip ]
> An earlier version of the patch set used the seccomp filter chain.
> Mickaël, what exactly was wrong with that approach other than that the
> seccomp() syscall was awkward for you to use?  You could add a
> seccomp_add_landlock_rule() syscall if you needed to.
>
> As a side comment, why is this an LSM at all, let alone a non-stacking
> LSM?  It would make a lot more sense to me to make Landlock depend on
> having LSMs configured in but to call the landlock hooks directly from
> the security_xyz() hooks.

Please, no. It is my serious intention to have at least the
infrastructure blob management in within a release or two, and
I think that's all Landlock needs. The security_xyz() hooks are
sufficiently hackish as it is without unnecessarily adding more
special cases.