From: "Serge E. Hallyn" <serge@hallyn.com>
To: "Mickaël Salaün" <mic@digikod.net>
Cc: "James Morris" <jmorris@namei.org>,
"Jann Horn" <jannh@google.com>,
"Serge E . Hallyn" <serge@hallyn.com>,
"Al Viro" <viro@zeniv.linux.org.uk>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Andy Lutomirski" <luto@amacapital.net>,
"Anton Ivanov" <anton.ivanov@cambridgegreys.com>,
"Arnd Bergmann" <arnd@arndb.de>,
"Casey Schaufler" <casey@schaufler-ca.com>,
"Jeff Dike" <jdike@addtoit.com>,
"Jonathan Corbet" <corbet@lwn.net>,
"Kees Cook" <keescook@chromium.org>,
"Michael Kerrisk" <mtk.manpages@gmail.com>,
"Richard Weinberger" <richard@nod.at>,
"Shuah Khan" <shuah@kernel.org>,
"Vincent Dagonneau" <vincent.dagonneau@ssi.gouv.fr>,
kernel-hardening@lists.openwall.com, linux-api@vger.kernel.org,
linux-arch@vger.kernel.org, linux-doc@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-kselftest@vger.kernel.org,
linux-security-module@vger.kernel.org, x86@kernel.org,
"Mickaël Salaün" <mic@linux.microsoft.com>
Subject: Re: [PATCH v28 07/12] landlock: Support filesystem access-control
Date: Wed, 10 Feb 2021 13:36:24 -0600 [thread overview]
Message-ID: <20210210193624.GA29893@mail.hallyn.com> (raw)
In-Reply-To: <20210202162710.657398-8-mic@digikod.net>
On Tue, Feb 02, 2021 at 05:27:05PM +0100, Mickaël Salaün wrote:
> From: Mickaël Salaün <mic@linux.microsoft.com>
>
> Thanks to the Landlock objects and ruleset, it is possible to identify
> inodes according to a process's domain. To enable an unprivileged
This throws me off a bit. "identify inodes according to a process's domain".
What exactly does it mean? "identify" how ?
> process to express a file hierarchy, it first needs to open a directory
> (or a file) and pass this file descriptor to the kernel through
> landlock_add_rule(2). When checking if a file access request is
> allowed, we walk from the requested dentry to the real root, following
> the different mount layers. The access to each "tagged" inodes are
> collected according to their rule layer level, and ANDed to create
> access to the requested file hierarchy. This makes possible to identify
> a lot of files without tagging every inodes nor modifying the
> filesystem, while still following the view and understanding the user
> has from the filesystem.
>
> Add a new ARCH_EPHEMERAL_INODES for UML because it currently does not
> keep the same struct inodes for the same inodes whereas these inodes are
> in use.
-serge
next prev parent reply other threads:[~2021-02-10 19:39 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-02 16:26 [PATCH v28 00/12] Landlock LSM Mickaël Salaün
2021-02-02 16:26 ` [PATCH v28 01/12] landlock: Add object management Mickaël Salaün
2021-02-03 14:21 ` Serge E. Hallyn
2021-02-03 15:27 ` Mickaël Salaün
2021-02-02 16:27 ` [PATCH v28 02/12] landlock: Add ruleset and domain management Mickaël Salaün
2021-02-04 3:30 ` Serge E. Hallyn
2021-02-02 16:27 ` [PATCH v28 03/12] landlock: Set up the security framework and manage credentials Mickaël Salaün
2021-02-04 3:46 ` Serge E. Hallyn
2021-02-02 16:27 ` [PATCH v28 04/12] landlock: Add ptrace restrictions Mickaël Salaün
2021-02-05 13:48 ` Serge E. Hallyn
2021-02-02 16:27 ` [PATCH v28 05/12] LSM: Infrastructure management of the superblock Mickaël Salaün
2021-02-05 14:17 ` Serge E. Hallyn
2021-02-05 16:51 ` Casey Schaufler
2021-02-05 16:51 ` Casey Schaufler
2021-02-02 16:27 ` [PATCH v28 06/12] fs,security: Add sb_delete hook Mickaël Salaün
2021-02-05 14:21 ` Serge E. Hallyn
2021-02-05 14:57 ` Mickaël Salaün
2021-02-07 4:18 ` Serge E. Hallyn
2021-02-02 16:27 ` [PATCH v28 07/12] landlock: Support filesystem access-control Mickaël Salaün
2021-02-10 19:36 ` Serge E. Hallyn [this message]
2021-02-10 20:17 ` Mickaël Salaün
2021-02-19 15:34 ` Serge E. Hallyn
2021-02-02 16:27 ` [PATCH v28 08/12] landlock: Add syscall implementations Mickaël Salaün
2021-02-03 0:53 ` kernel test robot
2021-02-03 15:04 ` Serge E. Hallyn
2021-02-03 22:52 ` kernel test robot
2021-02-02 16:27 ` [PATCH v28 09/12] arch: Wire up Landlock syscalls Mickaël Salaün
2021-02-02 16:27 ` [PATCH v28 10/12] selftests/landlock: Add user space tests Mickaël Salaün
2021-02-02 16:27 ` [PATCH v28 11/12] samples/landlock: Add a sandbox manager example Mickaël Salaün
2021-02-02 16:27 ` [PATCH v28 12/12] landlock: Add user and kernel documentation Mickaël Salaün
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