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From: Casey Schaufler <casey@schaufler-ca.com>
To: Andy Lutomirski <luto@kernel.org>
Cc: "Alexei Starovoitov" <alexei.starovoitov@gmail.com>,
	"Mickaël Salaün" <mic@digikod.net>,
	LKML <linux-kernel@vger.kernel.org>,
	"Alexei Starovoitov" <ast@kernel.org>,
	"Arnaldo Carvalho de Melo" <acme@kernel.org>,
	"Daniel Borkmann" <daniel@iogearbox.net>,
	"David Drysdale" <drysdale@google.com>,
	"David S . Miller" <davem@davemloft.net>,
	"Eric W . Biederman" <ebiederm@xmission.com>,
	"Jann Horn" <jann@thejh.net>, "Jonathan Corbet" <corbet@lwn.net>,
	"Michael Kerrisk" <mtk.manpages@gmail.com>,
	"Kees Cook" <keescook@chromium.org>,
	"Paul Moore" <paul@paul-moore.com>,
	"Sargun Dhillon" <sargun@sargun.me>,
	"Serge E . Hallyn" <serge@hallyn.com>,
	"Shuah Khan" <shuah@kernel.org>, "Tejun Heo" <tj@kernel.org>,
	"Thomas Graf" <tgraf@suug.ch>, "Tycho Andersen" <tycho@tycho.ws>,
	"Will Drewry" <wad@chromium.org>,
	"Kernel Hardening" <kernel-hardening@lists.openwall.com>,
	"Linux API" <linux-api@vger.kernel.org>,
	"LSM List" <linux-security-module@vger.kernel.org>,
	"Network Development" <netdev@vger.kernel.org>,
	"Andrew Morton" <akpm@linux-foundation.org>
Subject: Re: [PATCH bpf-next v8 05/11] seccomp,landlock: Enforce Landlock programs per process hierarchy
Date: Tue, 27 Feb 2018 10:03:00 -0800	[thread overview]
Message-ID: <a40d339b-bdaa-0650-bb4a-bf030d8b3294@schaufler-ca.com> (raw)
In-Reply-To: <CALCETrVo61UOGHJ6AgrLN_AyzUYuz-JRgET4d6ut-ErwUg_vZA@mail.gmail.com>

On 2/27/2018 9:36 AM, Andy Lutomirski wrote:
> On Tue, Feb 27, 2018 at 5:30 PM, Casey Schaufler <casey@schaufler-ca.com> wrote:
>> On 2/27/2018 8:39 AM, Andy Lutomirski wrote:
>>> On Tue, Feb 27, 2018 at 5:32 AM, Alexei Starovoitov
>>> <alexei.starovoitov@gmail.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.
>>
>>
> What do you mean by "infrastructure blob management"?

Today each security module manages their own module specific data,
for example inode->i_security and file->f_security. This prevents
having two security modules that have inode or file data from being
used at the same time, because they both need to manage those fields.
Moving the management of the module specific data (aka "blobs") from
the security modules to the module infrastructure will allow those
modules to coexist. Restrictions apply, of course, but I don't think
that Landlock uses any of the facilities that would have issues.

  reply	other threads:[~2018-02-27 18:03 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-02-27  0:41 [PATCH bpf-next v8 00/11] Landlock LSM: Toward unprivileged sandboxing Mickaël Salaün
2018-02-27  0:41 ` [PATCH bpf-next v8 01/11] fs,security: Add a security blob to nameidata Mickaël Salaün
2018-02-27  0:57   ` Al Viro
2018-02-27  1:23     ` Al Viro
2018-03-11 20:14       ` Mickaël Salaün
2018-02-28 16:27   ` kbuild test robot
2018-02-28 16:58   ` kbuild test robot
2018-02-27  0:41 ` [PATCH bpf-next v8 02/11] fs,security: Add a new file access type: MAY_CHROOT Mickaël Salaün
2018-02-27  0:41 ` [PATCH bpf-next v8 03/11] bpf: Add eBPF program subtype and is_valid_subtype() verifier Mickaël Salaün
2018-02-27  0:41 ` [PATCH bpf-next v8 04/11] bpf,landlock: Define an eBPF program type for Landlock hooks Mickaël Salaün
2018-02-27  0:41 ` [PATCH bpf-next v8 05/11] seccomp,landlock: Enforce Landlock programs per process hierarchy Mickaël Salaün
2018-02-27  2:08   ` Alexei Starovoitov
2018-02-27  4:40     ` Andy Lutomirski
2018-02-27  4:54       ` Alexei Starovoitov
2018-02-27  5:20         ` Andy Lutomirski
2018-02-27  5:32           ` Alexei Starovoitov
2018-02-27 16:39             ` Andy Lutomirski
2018-02-27 17:30               ` Casey Schaufler
2018-02-27 17:36                 ` Andy Lutomirski
2018-02-27 18:03                   ` Casey Schaufler [this message]
2018-02-27 21:48               ` Mickaël Salaün
2018-04-08 13:13                 ` Mickaël Salaün
2018-04-08 21:06                   ` Andy Lutomirski
2018-04-08 22:01                     ` Mickaël Salaün
2018-04-10  4:48                       ` Alexei Starovoitov
2018-04-11 22:18                         ` Mickaël Salaün
2018-02-27  0:41 ` [PATCH bpf-next v8 06/11] bpf,landlock: Add a new map type: inode Mickaël Salaün
2018-02-28 17:35   ` kbuild test robot
2018-02-27  0:41 ` [PATCH bpf-next v8 07/11] landlock: Handle filesystem access control Mickaël Salaün
2018-02-27  0:41 ` [PATCH bpf-next v8 08/11] landlock: Add ptrace restrictions Mickaël Salaün
2018-02-27  4:17   ` Andy Lutomirski
2018-02-27  5:01     ` Andy Lutomirski
2018-02-27 22:14       ` Mickaël Salaün
2018-02-27 23:02         ` Andy Lutomirski
2018-02-27 23:23           ` Andy Lutomirski
2018-02-28  0:00             ` Mickaël Salaün
2018-02-28  0:09               ` Andy Lutomirski
2018-03-06 22:28                 ` Mickaël Salaün
2018-04-01 22:48                   ` Mickaël Salaün
2018-02-27 22:18     ` Mickaël Salaün
2018-02-27  0:41 ` [PATCH bpf-next v8 09/11] bpf: Add a Landlock sandbox example Mickaël Salaün
2018-02-27  0:41 ` [PATCH bpf-next v8 10/11] bpf,landlock: Add tests for Landlock Mickaël Salaün
2018-02-27  0:41 ` [PATCH bpf-next v8 11/11] landlock: Add user and kernel documentation " Mickaël Salaün
2018-02-27  4:36 ` [PATCH bpf-next v8 00/11] Landlock LSM: Toward unprivileged sandboxing Andy Lutomirski
2018-02-27 22:03   ` Mickaël Salaün
2018-02-27 23:09     ` Andy Lutomirski
2018-03-06 22:25       ` Mickaël Salaün
2018-03-06 22:33         ` Andy Lutomirski
2018-03-06 22:46           ` Tycho Andersen
2018-03-06 23:06             ` Mickaël Salaün
2018-03-07  1:21               ` Andy Lutomirski
2018-03-08 23:51                 ` Mickaël Salaün
2018-03-08 23:53                   ` Andy Lutomirski
2018-04-01 22:04                     ` Mickaël Salaün
2018-04-02  0:39                       ` Tycho Andersen

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