[PATCH] selinux, smack: properly reference the LSM blob in security_watch_key()

[Paul Moore]

Unfortunately when we migrated the lifecycle management of the key LSM
blob to the LSM framework we forgot to convert the security_watch_key()
callbacks for SELinux and Smack.  This patch corrects this by making use
of the selinux_key() and smack_key() helper functions respectively.

This patch also removes some input checking in the Smack callback as it
is no longer needed.

Reported-by: syzbot+044fdf24e96093584232 at syzkaller.appspotmail.com
Fixes: 5f8d28f6d7d5 ("lsm: infrastructure management of the key security blob")
Signed-off-by: Paul Moore <paul at paul-moore.com>
---
 security/selinux/hooks.c   |  2 +-
 security/smack/smack_lsm.c | 13 +++----------
 2 files changed, 4 insertions(+), 11 deletions(-)

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 81fbfa5b80d4..67baa487cf7a 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -6720,7 +6720,7 @@ static int selinux_key_getsecurity(struct key *key, char **_buffer)
 #ifdef CONFIG_KEY_NOTIFICATIONS
 static int selinux_watch_key(struct key *key)
 {
-	struct key_security_struct *ksec = key->security;
+	struct key_security_struct *ksec = selinux_key(key);
 	u32 sid = current_sid();
 
 	return avc_has_perm(sid, ksec->sid, SECCLASS_KEY, KEY__VIEW, NULL);
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index da0c2bffbd08..563fb404f659 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -4629,16 +4629,9 @@ static int smack_watch_key(struct key *key)
 {
 	struct smk_audit_info ad;
 	struct smack_known *tkp = smk_of_current();
+	struct smack_known **blob = smack_key(key);
 	int rc;
 
-	if (key == NULL)
-		return -EINVAL;
-	/*
-	 * If the key hasn't been initialized give it access so that
-	 * it may do so.
-	 */
-	if (key->security == NULL)
-		return 0;
 	/*
 	 * This should not occur
 	 */
@@ -4653,8 +4646,8 @@ static int smack_watch_key(struct key *key)
 	ad.a.u.key_struct.key = key->serial;
 	ad.a.u.key_struct.key_desc = key->description;
 #endif
-	rc = smk_access(tkp, key->security, MAY_READ, &ad);
-	rc = smk_bu_note("key watch", tkp, key->security, MAY_READ, rc);
+	rc = smk_access(tkp, *blob, MAY_READ, &ad);
+	rc = smk_bu_note("key watch", tkp, *blob, MAY_READ, rc);
 	return rc;
 }
 #endif /* CONFIG_KEY_NOTIFICATIONS */
-- 
2.46.1