linux-kernel - [RFC PATCH v1 3/3] landlock: Document network restrictions tied to sockets

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Message-ID: <20240719150618.197991-4-mic@digikod.net>
Date: Fri, 19 Jul 2024 17:06:18 +0200
From: Mickaël Salaün <mic@...ikod.net>
To: Günther Noack <gnoack@...gle.com>,
	Ivanov Mikhail <ivanov.mikhail1@...wei-partners.com>,
	Konstantin Meskhidze <konstantin.meskhidze@...wei.com>,
	Paul Moore <paul@...l-moore.com>
Cc: Mickaël Salaün <mic@...ikod.net>,
	Casey Schaufler <casey@...aufler-ca.com>,
	Jeff Xu <jeffxu@...gle.com>,
	Kees Cook <keescook@...omium.org>,
	"Serge E . Hallyn" <serge@...lyn.com>,
	Shervin Oloumi <enlightened@...omium.org>,
	Tahera Fahimi <fahimitahera@...il.com>,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org
Subject: [RFC PATCH v1 3/3] landlock: Document network restrictions tied to sockets

The Landlock domain used to restrict operations on a socket is the
domain from the thread that created this socket.

Cc: Günther Noack <gnoack@...gle.com>
Cc: Ivanov Mikhail <ivanov.mikhail1@...wei-partners.com>
Cc: Konstantin Meskhidze <konstantin.meskhidze@...wei.com>
Cc: Paul Moore <paul@...l-moore.com>
Cc: Tahera Fahimi <fahimitahera@...il.com>
Signed-off-by: Mickaël Salaün <mic@...ikod.net>
Link: https://lore.kernel.org/r/20240719150618.197991-4-mic@digikod.net
---
 Documentation/userspace-api/landlock.rst | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/userspace-api/landlock.rst b/Documentation/userspace-api/landlock.rst
index 37dafce8038b..4a9bfff575d5 100644
--- a/Documentation/userspace-api/landlock.rst
+++ b/Documentation/userspace-api/landlock.rst
@@ -529,7 +529,9 @@ Network support (ABI < 4)
 Starting with the Landlock ABI version 4, it is now possible to restrict TCP
 bind and connect actions to only a set of allowed ports thanks to the new
 ``LANDLOCK_ACCESS_NET_BIND_TCP`` and ``LANDLOCK_ACCESS_NET_CONNECT_TCP``
-access rights.
+access rights.  These restrictions are tied to a socket and are inherited from
+the sandboxed thread that created this socket.  Hence, sockets created before
+sandboxing are not restricted.
 
 IOCTL (ABI < 5)
 ---------------
-- 
2.45.2