linux-kernel - [PATCH v3 2/3] landlock: Refactor network access mask management

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Message-ID: <20241022151144.872797-3-mic@digikod.net>
Date: Tue, 22 Oct 2024 17:11:43 +0200
From: Mickaël Salaün <mic@...ikod.net>
To: Günther Noack <gnoack@...gle.com>,
	Mikhail Ivanov <ivanov.mikhail1@...wei-partners.com>
Cc: Mickaël Salaün <mic@...ikod.net>,
	Konstantin Meskhidze <konstantin.meskhidze@...wei.com>,
	Paul Moore <paul@...l-moore.com>,
	Tahera Fahimi <fahimitahera@...il.com>,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org
Subject: [PATCH v3 2/3] landlock: Refactor network access mask management

Replace get_raw_handled_net_accesses() and get_current_net_domain() with
a call to landlock_match_ruleset().

Cc: Günther Noack <gnoack@...gle.com>
Cc: Konstantin Meskhidze <konstantin.meskhidze@...wei.com>
Cc: Mikhail Ivanov <ivanov.mikhail1@...wei-partners.com>
Signed-off-by: Mickaël Salaün <mic@...ikod.net>
Link: https://lore.kernel.org/r/20241022151144.872797-3-mic@digikod.net
---

Changes since v2:
* Replace get_current_net_domain() with explicit call to
  landlock_match_ruleset().

Changes since v1:
* Rename the all_net mask to any_net.
---
 security/landlock/net.c | 27 +++++----------------------
 1 file changed, 5 insertions(+), 22 deletions(-)

diff --git a/security/landlock/net.c b/security/landlock/net.c
index c8bcd29bde09..27872d0f7e11 100644
--- a/security/landlock/net.c
+++ b/security/landlock/net.c
@@ -39,27 +39,9 @@ int landlock_append_net_rule(struct landlock_ruleset *const ruleset,
 	return err;
 }
 
-static access_mask_t
-get_raw_handled_net_accesses(const struct landlock_ruleset *const domain)
-{
-	access_mask_t access_dom = 0;
-	size_t layer_level;
-
-	for (layer_level = 0; layer_level < domain->num_layers; layer_level++)
-		access_dom |= landlock_get_net_access_mask(domain, layer_level);
-	return access_dom;
-}
-
-static const struct landlock_ruleset *get_current_net_domain(void)
-{
-	const struct landlock_ruleset *const dom =
-		landlock_get_current_domain();
-
-	if (!dom || !get_raw_handled_net_accesses(dom))
-		return NULL;
-
-	return dom;
-}
+static const struct access_masks any_net = {
+	.net = ~0,
+};
 
 static int current_check_access_socket(struct socket *const sock,
 				       struct sockaddr *const address,
@@ -72,7 +54,8 @@ static int current_check_access_socket(struct socket *const sock,
 	struct landlock_id id = {
 		.type = LANDLOCK_KEY_NET_PORT,
 	};
-	const struct landlock_ruleset *const dom = get_current_net_domain();
+	const struct landlock_ruleset *const dom =
+		landlock_match_ruleset(landlock_get_current_domain(), any_net);
 
 	if (!dom)
 		return 0;
-- 
2.47.0