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From: Randy Dunlap <rdunlap@infradead.org>
To: "Mickaël Salaün" <mickael.salaun@ssi.gouv.fr>,
	"Mickaël Salaün" <mic@digikod.net>,
	linux-kernel@vger.kernel.org
Cc: Alexander Viro <viro@zeniv.linux.org.uk>,
	Alexei Starovoitov <ast@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Andy Lutomirski <luto@amacapital.net>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Casey Schaufler <casey@schaufler-ca.com>,
	Daniel Borkmann <daniel@iogearbox.net>,
	David Drysdale <drysdale@google.com>,
	"David S . Miller" <davem@davemloft.net>,
	"Eric W . Biederman" <ebiederm@xmission.com>,
	James Morris <jmorris@namei.org>, Jann Horn <jann@thejh.net>,
	John Johansen <john.johansen@canonical.com>,
	Jonathan Corbet <corbet@lwn.net>,
	Kees Cook <keescook@chromium.org>,
	Michael Kerrisk <mtk.manpages@gmail.com>,
	Paul Moore <paul@paul-moore.com>,
	Sargun Dhillon <sargun@sargun.me>,
	"Serge E . Hallyn" <serge@hallyn.com>,
	Shuah Khan <shuah@kernel.org>,
	Stephen Smalley <sds@tycho.nsa.gov>, Tejun Heo <tj@kernel.org>,
	Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
	Thomas Graf <tgraf@suug.ch>, Tycho Andersen <tycho@tycho.ws>,
	Will Drewry <wad@chromium.org>,
	kernel-hardening@lists.openwall.com, linux-api@vger.kernel.org,
	linux-fsdevel@vger.kernel.org,
	linux-security-module@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH bpf-next v10 10/10] landlock: Add user and kernel documentation for Landlock
Date: Thu, 1 Aug 2019 10:49:05 -0700
Message-ID: <08c94f99-68e0-4866-3eba-28fa71347fca@infradead.org> (raw)
In-Reply-To: <2ced8fc8-79a6-b0fb-70fe-6716fae92aa7@ssi.gouv.fr>

On 8/1/19 10:03 AM, Mickaël Salaün wrote:
>>> +Ptrace restrictions
>>> +-------------------
>>> +
>>> +A landlocked process has less privileges than a non-landlocked process and must
>>> +then be subject to additional restrictions when manipulating another process.
>>> +To be allowed to use :manpage:`ptrace(2)` and related syscalls on a target
>>> +process, a landlocked process must have a subset of the target process programs.
>>             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> Maybe that last statement is correct, but it seems to me that it is missing something.
> What about this:
> 
> To be allowed to trace a process (using :manpage:`ptrace(2)`), a
> landlocked tracer process must only be constrained by a subset (possibly
> empty) of the Landlock programs which are also applied to the tracee.
> This ensure that the tracer has less or the same constraints than the

       ensures

> tracee, hence protecting against privilege escalation.

Yes, better.  Thanks.


-- 
~Randy

      reply index

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-21 21:31 [PATCH bpf-next v10 00/10] Landlock LSM: Toward unprivileged sandboxing Mickaël Salaün
2019-07-21 21:31 ` [PATCH bpf-next v10 01/10] fs,security: Add a new file access type: MAY_CHROOT Mickaël Salaün
2019-07-21 21:31 ` [PATCH bpf-next v10 02/10] bpf: Add expected_attach_triggers and a is_valid_triggers() verifier Mickaël Salaün
2019-07-21 21:31 ` [PATCH bpf-next v10 03/10] bpf,landlock: Define an eBPF program type for Landlock hooks Mickaël Salaün
2019-07-21 21:31 ` [PATCH bpf-next v10 04/10] seccomp,landlock: Enforce Landlock programs per process hierarchy Mickaël Salaün
2019-07-21 21:31 ` [PATCH bpf-next v10 05/10] landlock: Handle filesystem access control Mickaël Salaün
2019-07-21 21:31 ` [PATCH bpf-next v10 06/10] bpf,landlock: Add a new map type: inode Mickaël Salaün
2019-07-27  1:40   ` Alexei Starovoitov
2019-07-31 18:46     ` Mickaël Salaün
2019-07-31 18:58       ` Alexei Starovoitov
2019-07-31 19:11         ` Mickaël Salaün
2019-08-01 17:35           ` Alexei Starovoitov
2019-08-06 16:24             ` Mickaël Salaün
2019-09-08 22:09       ` Mickaël Salaün
2019-09-08 22:19         ` Al Viro
2019-07-21 21:31 ` [PATCH bpf-next v10 07/10] landlock: Add ptrace restrictions Mickaël Salaün
2019-07-21 21:31 ` [PATCH bpf-next v10 08/10] bpf: Add a Landlock sandbox example Mickaël Salaün
2019-07-21 21:31 ` [PATCH bpf-next v10 09/10] bpf,landlock: Add tests for Landlock Mickaël Salaün
2019-07-21 21:31 ` [PATCH bpf-next v10 10/10] landlock: Add user and kernel documentation " Mickaël Salaün
2019-07-31  1:53   ` Randy Dunlap
2019-08-01 17:03     ` Mickaël Salaün
2019-08-01 17:49       ` Randy Dunlap [this message]

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