netdev - Re: [PATCH net-next v7 08/10] bpf: Add a Landlock sandbox example

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Message-ID: <CAMXgnP64XxJGLyWqqNQ7P-Ok+UDydb+t8Pm9dUyXZ_9cx+Cfmw@mail.gmail.com>
Date:   Fri, 1 Sep 2017 12:25:24 +0200
From:   Alban Crequy <alban.crequy@...il.com>
To:     Mickaël Salaün <mic@...ikod.net>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Andy Lutomirski <luto@...capital.net>,
        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>,
        Matthew Garrett <mjg59@...f.ucam.org>,
        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@...ts.openwall.com,
        Linux API <linux-api@...r.kernel.org>,
        LSM <linux-security-module@...r.kernel.org>,
        netdev@...r.kernel.org, Michael Schubert <michael@...volk.io>,
        Iago Lopez Galeiras <iago@...volk.io>,
        Alban Crequy <alban@...volk.io>
Subject: Re: [PATCH net-next v7 08/10] bpf: Add a Landlock sandbox example

Hi Mickaël,

On 21 August 2017 at 02:09, Mickaël Salaün <mic@...ikod.net> wrote:
> Add a basic sandbox tool to create a process isolated from some part of
> the system. This sandbox create a read-only environment. It is only
> allowed to write to a character device such as a TTY:
...
> +       /*
> +        * This check allows the action on the file if it is a directory or a
> +        * pipe. Otherwise, a message is printed to the eBPF log.
> +        */
> +       if (S_ISCHR(ret) || S_ISFIFO(ret))
> +               return 0;


The comment says "directory", but the code checks for "character device".

Thanks!
Alban