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

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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

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