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Date: Mon, 16 Nov 2020 22:26:09 +0100
From: Pavel Machek <>
To: Mickaël Salaün <>
Cc: James Morris <>, "Serge E . Hallyn" <>,
	Al Viro <>,
	Andy Lutomirski <>,
	Anton Ivanov <>,
	Arnd Bergmann <>,
	Casey Schaufler <>,
	Jann Horn <>, Jeff Dike <>,
	Jonathan Corbet <>, Kees Cook <>,
	Michael Kerrisk <>,
	Richard Weinberger <>, Shuah Khan <>,
	Vincent Dagonneau <>,,,,,,,,,,
	Mickaël Salaün <>
Subject: Re: [PATCH v22 01/12] landlock: Add object management


> 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.

> +	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,

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