linux-kernel - [RFC PATCH v2 03/14] landlock: Factor out check_access

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Message-ID: <20241022161009.982584-4-mic@digikod.net>
Date: Tue, 22 Oct 2024 18:09:58 +0200
From: Mickaël Salaün <mic@...ikod.net>
To: Eric Paris <eparis@...hat.com>,
	Paul Moore <paul@...l-moore.com>,
	Günther Noack <gnoack@...gle.com>,
	"Serge E . Hallyn" <serge@...lyn.com>
Cc: Mickaël Salaün <mic@...ikod.net>,
	Ben Scarlato <akhna@...gle.com>,
	Casey Schaufler <casey@...aufler-ca.com>,
	Charles Zaffery <czaffery@...lox.com>,
	James Morris <jmorris@...ei.org>,
	Jann Horn <jannh@...gle.com>,
	Jeff Xu <jeffxu@...gle.com>,
	Jorge Lucangeli Obes <jorgelo@...gle.com>,
	Kees Cook <kees@...nel.org>,
	Konstantin Meskhidze <konstantin.meskhidze@...wei.com>,
	Matt Bobrowski <mattbobrowski@...gle.com>,
	Mikhail Ivanov <ivanov.mikhail1@...wei-partners.com>,
	Praveen K Paladugu <prapal@...ux.microsoft.com>,
	Robert Salvet <robert.salvet@...lox.com>,
	Shervin Oloumi <enlightened@...gle.com>,
	Song Liu <song@...nel.org>,
	Tahera Fahimi <fahimitahera@...il.com>,
	audit@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org
Subject: [RFC PATCH v2 03/14] landlock: Factor out check_access_path()

Merge check_access_path() into current_check_access_path() and make
hook_path_mknod() use it.

Cc: Günther Noack <gnoack@...gle.com>
Signed-off-by: Mickaël Salaün <mic@...ikod.net>
Link: https://lore.kernel.org/r/20241022161009.982584-4-mic@digikod.net
---

Changes since v1:
* Rebased on the TCP patch series.
* Remove inlining removal which was merged.
---
 security/landlock/fs.c | 32 +++++++++++---------------------
 1 file changed, 11 insertions(+), 21 deletions(-)

diff --git a/security/landlock/fs.c b/security/landlock/fs.c
index dd9a7297ea4e..698a623a8184 100644
--- a/security/landlock/fs.c
+++ b/security/landlock/fs.c
@@ -907,28 +907,22 @@ static bool is_access_to_paths_allowed(
 	return allowed_parent1 && allowed_parent2;
 }
 
-static int check_access_path(const struct landlock_ruleset *const domain,
-			     const struct path *const path,
-			     access_mask_t access_request)
-{
-	layer_mask_t layer_masks[LANDLOCK_NUM_ACCESS_FS] = {};
-
-	access_request = landlock_init_layer_masks(
-		domain, access_request, &layer_masks, LANDLOCK_KEY_INODE);
-	if (is_access_to_paths_allowed(domain, path, access_request,
-				       &layer_masks, NULL, 0, NULL, NULL))
-		return 0;
-	return -EACCES;
-}
-
 static int current_check_access_path(const struct path *const path,
-				     const access_mask_t access_request)
+				     access_mask_t access_request)
 {
 	const struct landlock_ruleset *const dom = get_current_fs_domain();
+	layer_mask_t layer_masks[LANDLOCK_NUM_ACCESS_FS] = {};
 
 	if (!dom)
 		return 0;
-	return check_access_path(dom, path, access_request);
+
+	access_request = landlock_init_layer_masks(
+		dom, access_request, &layer_masks, LANDLOCK_KEY_INODE);
+	if (is_access_to_paths_allowed(dom, path, access_request, &layer_masks,
+				       NULL, 0, NULL, NULL))
+		return 0;
+
+	return -EACCES;
 }
 
 static access_mask_t get_mode_access(const umode_t mode)
@@ -1413,11 +1407,7 @@ static int hook_path_mknod(const struct path *const dir,
 			   struct dentry *const dentry, const umode_t mode,
 			   const unsigned int dev)
 {
-	const struct landlock_ruleset *const dom = get_current_fs_domain();
-
-	if (!dom)
-		return 0;
-	return check_access_path(dom, dir, get_mode_access(mode));
+	return current_check_access_path(dir, get_mode_access(mode));
 }
 
 static int hook_path_symlink(const struct path *const dir,
-- 
2.47.0