diff options
| -rw-r--r-- | security/smack/smack_lsm.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 94dc9d406ce3..b76696b84e5c 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -52,6 +52,7 @@ #define SMK_SENDING 2 #ifdef SMACK_IPV6_PORT_LABELING +DEFINE_MUTEX(smack_ipv6_lock); static LIST_HEAD(smk_ipv6_port_list); #endif static struct kmem_cache *smack_inode_cache; @@ -2603,17 +2604,20 @@ static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address) * on the bound socket. Take the changes to the port * as well. */ - list_for_each_entry(spp, &smk_ipv6_port_list, list) { + rcu_read_lock(); + list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { if (sk != spp->smk_sock) continue; spp->smk_in = ssp->smk_in; spp->smk_out = ssp->smk_out; + rcu_read_unlock(); return; } /* * A NULL address is only used for updating existing * bound entries. If there isn't one, it's OK. */ + rcu_read_unlock(); return; } @@ -2629,16 +2633,18 @@ static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address) * Look for an existing port list entry. * This is an indication that a port is getting reused. */ - list_for_each_entry(spp, &smk_ipv6_port_list, list) { + rcu_read_lock(); + list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { if (spp->smk_port != port) continue; spp->smk_port = port; spp->smk_sock = sk; spp->smk_in = ssp->smk_in; spp->smk_out = ssp->smk_out; + rcu_read_unlock(); return; } - + rcu_read_unlock(); /* * A new port entry is required. */ @@ -2651,7 +2657,9 @@ static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address) spp->smk_in = ssp->smk_in; spp->smk_out = ssp->smk_out; - list_add(&spp->list, &smk_ipv6_port_list); + mutex_lock(&smack_ipv6_lock); + list_add_rcu(&spp->list, &smk_ipv6_port_list); + mutex_unlock(&smack_ipv6_lock); return; } @@ -2702,7 +2710,8 @@ static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address, return 0; port = ntohs(address->sin6_port); - list_for_each_entry(spp, &smk_ipv6_port_list, list) { + rcu_read_lock(); + list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { if (spp->smk_port != port) continue; object = spp->smk_in; @@ -2710,6 +2719,7 @@ static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address, ssp->smk_packet = spp->smk_out; break; } + rcu_read_unlock(); return smk_ipv6_check(skp, object, address, act); } |