kernel-hardening - Re: [PATCH v30 02/12] landlock: Add ruleset and domain management

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Message-ID: <CAG48ez3v44du6_qVLa25SOdfLsr5+z-=a0pUP63d=qHP2tf4Pg@mail.gmail.com>
Date: Tue, 23 Mar 2021 01:13:27 +0100
From: Jann Horn <jannh@...gle.com>
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>, Andrew Morton <akpm@...ux-foundation.org>, 
	Andy Lutomirski <luto@...capital.net>, Anton Ivanov <anton.ivanov@...bridgegreys.com>, 
	Arnd Bergmann <arnd@...db.de>, Casey Schaufler <casey@...aufler-ca.com>, 
	David Howells <dhowells@...hat.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 <kernel-hardening@...ts.openwall.com>, Linux API <linux-api@...r.kernel.org>, 
	linux-arch <linux-arch@...r.kernel.org>, 
	"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>, linux-fsdevel <linux-fsdevel@...r.kernel.org>, 
	kernel list <linux-kernel@...r.kernel.org>, 
	"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>, 
	linux-security-module <linux-security-module@...r.kernel.org>, 
	"the arch/x86 maintainers" <x86@...nel.org>, Mickaël Salaün <mic@...ux.microsoft.com>
Subject: Re: [PATCH v30 02/12] landlock: Add ruleset and domain management

On Tue, Mar 16, 2021 at 9:43 PM Mickaël Salaün <mic@...ikod.net> wrote:
> A Landlock ruleset is mainly a red-black tree with Landlock rules as
> nodes.  This enables quick update and lookup to match a requested
> access, e.g. to a file.  A ruleset is usable through a dedicated file
> descriptor (cf. following commit implementing syscalls) which enables a
> process to create and populate a ruleset with new rules.
>
> A domain is a ruleset tied to a set of processes.  This group of rules
> defines the security policy enforced on these processes and their future
> children.  A domain can transition to a new domain which is the
> intersection of all its constraints and those of a ruleset provided by
> the current process.  This modification only impact the current process.
> This means that a process can only gain more constraints (i.e. lose
> accesses) over time.
>
> Cc: James Morris <jmorris@...ei.org>
> Cc: Jann Horn <jannh@...gle.com>
> Cc: Kees Cook <keescook@...omium.org>
> Signed-off-by: Mickaël Salaün <mic@...ux.microsoft.com>
> Acked-by: Serge Hallyn <serge@...lyn.com>
> Link: https://lore.kernel.org/r/20210316204252.427806-3-mic@digikod.net

Reviewed-by: Jann Horn <jannh@...gle.com>

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