linux-kernel - [RFC PATCH 5/6] smack: explicitly skip mediation of O

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Message-ID: <20250312212148.274205-6-ryan.lee@canonical.com>
Date: Wed, 12 Mar 2025 14:21:45 -0700
From: Ryan Lee <ryan.lee@...onical.com>
To: linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	apparmor@...ts.ubuntu.com,
	linux-security-module@...r.kernel.org,
	selinux@...r.kernel.org
Cc: Ryan Lee <ryan.lee@...onical.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	Jan Kara <jack@...e.cz>,
	John Johansen <john.johansen@...onical.com>,
	Paul Moore <paul@...l-moore.com>,
	James Morris <jmorris@...ei.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Mickaël Salaün <mic@...ikod.net>,
	Günther Noack <gnoack@...gle.com>,
	Stephen Smalley <stephen.smalley.work@...il.com>,
	Ondrej Mosnacek <omosnace@...hat.com>,
	Casey Schaufler <casey@...aufler-ca.com>,
	Kentaro Takeda <takedakn@...data.co.jp>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Subject: [RFC PATCH 5/6] smack: explicitly skip mediation of O_PATH file descriptors

Now that O_PATH fds are being passed to the file_open hook,
unconditionally skip mediation of them to preserve existing behavior.

Signed-off-by: Ryan Lee <ryan.lee@...onical.com>
---
 security/smack/smack_lsm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 2f65eb392bc0..c05e223bfb33 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -2062,6 +2062,10 @@ static int smack_file_open(struct file *file)
 	struct smk_audit_info ad;
 	int rc;
 
+	/* Preserve the behavior of O_PATH fd creation not being mediated */
+	if (file->f_flags & O_PATH)
+		return 0;
+
 	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
 	smk_ad_setfield_u_fs_path(&ad, file->f_path);
 	rc = smk_tskacc(tsp, smk_of_inode(inode), MAY_READ, &ad);
-- 
2.43.0

base-kernel: v6.14-rc6