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Diffstat (limited to 'security/selinux/hooks.c')
-rw-r--r--security/selinux/hooks.c46
1 files changed, 37 insertions, 9 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index bfe9a05db3a..6156241c877 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -51,8 +51,10 @@
#include <net/ip.h> /* for local_port_range[] */
#include <net/tcp.h> /* struct or_callable used in sock_rcv_skb */
#include <net/net_namespace.h>
+#include <net/netlabel.h>
#include <asm/uaccess.h>
#include <asm/ioctls.h>
+#include <asm/atomic.h>
#include <linux/bitops.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h> /* for network interface checks */
@@ -91,6 +93,9 @@ extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
extern int selinux_compat_net;
extern struct security_operations *security_ops;
+/* SECMARK reference count */
+atomic_t selinux_secmark_refcount = ATOMIC_INIT(0);
+
#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
int selinux_enforcing = 0;
@@ -157,6 +162,21 @@ getsecurity_exit:
return len;
}
+/**
+ * selinux_secmark_enabled - Check to see if SECMARK is currently enabled
+ *
+ * Description:
+ * This function checks the SECMARK reference counter to see if any SECMARK
+ * targets are currently configured, if the reference counter is greater than
+ * zero SECMARK is considered to be enabled. Returns true (1) if SECMARK is
+ * enabled, false (0) if SECMARK is disabled.
+ *
+ */
+static int selinux_secmark_enabled(void)
+{
+ return (atomic_read(&selinux_secmark_refcount) > 0);
+}
+
/* Allocate and free functions for each kind of security blob. */
static int task_alloc_security(struct task_struct *task)
@@ -3931,7 +3951,6 @@ static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
struct sk_security_struct *sksec = sk->sk_security;
u16 family = sk->sk_family;
u32 sk_sid = sksec->sid;
- u32 peer_sid;
struct avc_audit_data ad;
char *addrp;
@@ -3957,15 +3976,24 @@ static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
return selinux_sock_rcv_skb_compat(sk, skb, &ad,
family, addrp);
- err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET,
- PACKET__RECV, &ad);
- if (err)
- return err;
+ if (selinux_secmark_enabled()) {
+ err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET,
+ PACKET__RECV, &ad);
+ if (err)
+ return err;
+ }
- err = selinux_skb_peerlbl_sid(skb, family, &peer_sid);
- if (err)
- return err;
- return avc_has_perm(sk_sid, peer_sid, SECCLASS_PEER, PEER__RECV, &ad);
+ if (netlbl_enabled() || selinux_xfrm_enabled()) {
+ u32 peer_sid;
+
+ err = selinux_skb_peerlbl_sid(skb, family, &peer_sid);
+ if (err)
+ return err;
+ err = avc_has_perm(sk_sid, peer_sid, SECCLASS_PEER,
+ PEER__RECV, &ad);
+ }
+
+ return err;
}
static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *optval,