diff options
Diffstat (limited to 'security/selinux/netlabel.c')
| -rw-r--r-- | security/selinux/netlabel.c | 81 |
1 files changed, 13 insertions, 68 deletions
diff --git a/security/selinux/netlabel.c b/security/selinux/netlabel.c index 0fa2be4149e8..ccf71f69a185 100644 --- a/security/selinux/netlabel.c +++ b/security/selinux/netlabel.c @@ -69,9 +69,7 @@ static int selinux_netlbl_sidlookup_cached(struct sk_buff *skb, * * Description: * Attempt to label a socket using the NetLabel mechanism using the given - * SID. Returns zero values on success, negative values on failure. The - * caller is responsibile for calling rcu_read_lock() before calling this - * this function and rcu_read_unlock() after this function returns. + * SID. Returns zero values on success, negative values on failure. * */ static int selinux_netlbl_sock_setsid(struct sock *sk, u32 sid) @@ -86,11 +84,8 @@ static int selinux_netlbl_sock_setsid(struct sock *sk, u32 sid) if (rc != 0) goto sock_setsid_return; rc = netlbl_sock_setattr(sk, &secattr); - if (rc == 0) { - spin_lock_bh(&sksec->nlbl_lock); + if (rc == 0) sksec->nlbl_state = NLBL_LABELED; - spin_unlock_bh(&sksec->nlbl_lock); - } sock_setsid_return: netlbl_secattr_destroy(&secattr); @@ -129,45 +124,6 @@ void selinux_netlbl_sk_security_reset(struct sk_security_struct *ssec, } /** - * selinux_netlbl_sk_security_init - Setup the NetLabel fields - * @ssec: the sk_security_struct - * @family: the socket family - * - * Description: - * Called when a new sk_security_struct is allocated to initialize the NetLabel - * fields. - * - */ -void selinux_netlbl_sk_security_init(struct sk_security_struct *ssec, - int family) -{ - /* No locking needed, we are the only one who has access to ssec */ - selinux_netlbl_sk_security_reset(ssec, family); - spin_lock_init(&ssec->nlbl_lock); -} - -/** - * selinux_netlbl_sk_security_clone - Copy the NetLabel fields - * @ssec: the original sk_security_struct - * @newssec: the cloned sk_security_struct - * - * Description: - * Clone the NetLabel specific sk_security_struct fields from @ssec to - * @newssec. - * - */ -void selinux_netlbl_sk_security_clone(struct sk_security_struct *ssec, - struct sk_security_struct *newssec) -{ - /* We don't need to take newssec->nlbl_lock because we are the only - * thread with access to newssec, but we do need to take the RCU read - * lock as other threads could have access to ssec */ - rcu_read_lock(); - selinux_netlbl_sk_security_reset(newssec, ssec->sk->sk_family); - rcu_read_unlock(); -} - -/** * selinux_netlbl_skbuff_getsid - Get the sid of a packet using NetLabel * @skb: the packet * @family: protocol family @@ -221,12 +177,8 @@ void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock) struct netlbl_lsm_secattr secattr; u32 nlbl_peer_sid; - rcu_read_lock(); - - if (sksec->nlbl_state != NLBL_REQUIRE) { - rcu_read_unlock(); + if (sksec->nlbl_state != NLBL_REQUIRE) return; - } netlbl_secattr_init(&secattr); if (netlbl_sock_getattr(sk, &secattr) == 0 && @@ -239,8 +191,6 @@ void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock) * here we will pick up the pieces in later calls to * selinux_netlbl_inode_permission(). */ selinux_netlbl_sock_setsid(sk, sksec->sid); - - rcu_read_unlock(); } /** @@ -254,16 +204,13 @@ void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock) */ int selinux_netlbl_socket_post_create(struct socket *sock) { - int rc = 0; struct sock *sk = sock->sk; struct sk_security_struct *sksec = sk->sk_security; - rcu_read_lock(); - if (sksec->nlbl_state == NLBL_REQUIRE) - rc = selinux_netlbl_sock_setsid(sk, sksec->sid); - rcu_read_unlock(); + if (sksec->nlbl_state != NLBL_REQUIRE) + return 0; - return rc; + return selinux_netlbl_sock_setsid(sk, sksec->sid); } /** @@ -288,21 +235,21 @@ int selinux_netlbl_inode_permission(struct inode *inode, int mask) if (!S_ISSOCK(inode->i_mode) || ((mask & (MAY_WRITE | MAY_APPEND)) == 0)) return 0; + sock = SOCKET_I(inode); sk = sock->sk; sksec = sk->sk_security; - - rcu_read_lock(); - if (sksec->nlbl_state != NLBL_REQUIRE) { - rcu_read_unlock(); + if (sksec->nlbl_state != NLBL_REQUIRE) return 0; - } + local_bh_disable(); bh_lock_sock_nested(sk); - rc = selinux_netlbl_sock_setsid(sk, sksec->sid); + if (likely(sksec->nlbl_state == NLBL_REQUIRE)) + rc = selinux_netlbl_sock_setsid(sk, sksec->sid); + else + rc = 0; bh_unlock_sock(sk); local_bh_enable(); - rcu_read_unlock(); return rc; } @@ -385,7 +332,6 @@ int selinux_netlbl_socket_setsockopt(struct socket *sock, struct sk_security_struct *sksec = sk->sk_security; struct netlbl_lsm_secattr secattr; - rcu_read_lock(); if (level == IPPROTO_IP && optname == IP_OPTIONS && sksec->nlbl_state == NLBL_LABELED) { netlbl_secattr_init(&secattr); @@ -396,7 +342,6 @@ int selinux_netlbl_socket_setsockopt(struct socket *sock, rc = -EACCES; netlbl_secattr_destroy(&secattr); } - rcu_read_unlock(); return rc; } |