linux-kernel - [RFC PATCH 13/15] LSM: restrict security_cred

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Message-ID: <20250621171851.5869-14-casey@schaufler-ca.com>
Date: Sat, 21 Jun 2025 10:18:48 -0700
From: Casey Schaufler <casey@...aufler-ca.com>
To: casey@...aufler-ca.com,
	paul@...l-moore.com,
	eparis@...hat.com,
	linux-security-module@...r.kernel.org,
	audit@...r.kernel.org
Cc: jmorris@...ei.org,
	serge@...lyn.com,
	keescook@...omium.org,
	john.johansen@...onical.com,
	penguin-kernel@...ove.sakura.ne.jp,
	stephen.smalley.work@...il.com,
	linux-kernel@...r.kernel.org,
	selinux@...r.kernel.org
Subject: [RFC PATCH 13/15] LSM: restrict security_cred_getsecid() to a single LSM

The LSM hook security_cred_getsecid() provides a single secid
that is only used by the binder driver. Provide the first value
available, and abandon any other hooks.

Signed-off-by: Casey Schaufler <casey@...aufler-ca.com>
---
 security/security.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/security/security.c b/security/security.c
index dd167a872248..409b1cb10d35 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2740,8 +2740,13 @@ void security_transfer_creds(struct cred *new, const struct cred *old)
  */
 void security_cred_getsecid(const struct cred *c, u32 *secid)
 {
+	struct lsm_static_call *scall;
+
 	*secid = 0;
-	call_void_hook(cred_getsecid, c, secid);
+	lsm_for_each_hook(scall, cred_getsecid) {
+		scall->hl->hook.cred_getsecid(c, secid);
+		break;
+	}
 }
 EXPORT_SYMBOL(security_cred_getsecid);
 
-- 
2.47.0