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Message-ID: <20201116212609.GA13063@amd>
Date: Mon, 16 Nov 2020 22:26:09 +0100
From: Pavel Machek <pavel@....cz>
To: Mickaël Salaün <mic@...ikod.net>
Cc: James Morris <jmorris@...ei.org>, "Serge E . Hallyn" <serge@...lyn.com>,
Al Viro <viro@...iv.linux.org.uk>,
Andy Lutomirski <luto@...capital.net>,
Anton Ivanov <anton.ivanov@...bridgegreys.com>,
Arnd Bergmann <arnd@...db.de>,
Casey Schaufler <casey@...aufler-ca.com>,
Jann Horn <jannh@...gle.com>, Jeff Dike <jdike@...toit.com>,
Jonathan Corbet <corbet@....net>, Kees Cook <keescook@...omium.org>,
Michael Kerrisk <mtk.manpages@...il.com>,
Richard Weinberger <richard@....at>, Shuah Khan <shuah@...nel.org>,
Vincent Dagonneau <vincent.dagonneau@....gouv.fr>,
kernel-hardening@...ts.openwall.com, linux-api@...r.kernel.org,
linux-arch@...r.kernel.org, linux-doc@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-kselftest@...r.kernel.org,
linux-security-module@...r.kernel.org, x86@...nel.org,
Mickaël Salaün <mic@...ux.microsoft.com>
Subject: Re: [PATCH v22 01/12] landlock: Add object management
Hi!
> A Landlock object enables to identify a kernel object (e.g. an inode).
> A Landlock rule is a set of access rights allowed on an object. Rules
> are grouped in rulesets that may be tied to a set of processes (i.e.
> subjects) to enforce a scoped access-control (i.e. a domain).
>
> Because Landlock's goal is to empower any process (especially
> unprivileged ones) to sandbox themselves, we cannot rely on a
> system-wide object identification such as file extended attributes.
> +config SECURITY_LANDLOCK
> + bool "Landlock support"
> + depends on SECURITY
> + select SECURITY_PATH
> + help
> + Landlock is a safe sandboxing mechanism which enables processes to
> + restrict themselves (and their future children) by gradually
> + enforcing tailored access control policies. A security policy is a
> + set of access rights (e.g. open a file in read-only, make a
> + directory, etc.) tied to a file hierarchy. Such policy can be configured
> + and enforced by any processes for themselves thanks to dedicated system
> + calls: landlock_create_ruleset(), landlock_add_rule(), and
> + landlock_enforce_ruleset_current().
How does it interact with setuid binaries? Being able to exec passwd
in a sandbox sounds like ... fun way to get root? :-).
Best regards,
Pavel
--
http://www.livejournal.com/~pavelmachek
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