Generalize selinux_skb_sk() added in commit 212cd0895330
("selinux: fix random read in selinux_ip_postroute_compat()")
so that we can use it other contexts.
Use it right away in selinux_netlbl_skbuff_setsid()
Fixes: ca6fb0651883 ("tcp: attach SYNACK messages to request sockets instead of
listener")
Signed-off-by: Eric Dumazet <eduma...@google.com>
---
include/net/inet_sock.h | 12 ++++++++++++
security/selinux/hooks.c | 16 ++--------------
security/selinux/netlabel.c | 2 +-
3 files changed, 15 insertions(+), 15 deletions(-)
diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h
index f5bf7310e334..2134e6d815bc 100644
--- a/include/net/inet_sock.h
+++ b/include/net/inet_sock.h
@@ -210,6 +210,18 @@ struct inet_sock {
#define IP_CMSG_ORIGDSTADDR BIT(6)
#define IP_CMSG_CHECKSUM BIT(7)
+/* SYNACK messages might be attached to request sockets.
+ * Some places want to reach the listener in this case.
+ */
+static inline struct sock *skb_to_full_sk(const struct sk_buff *skb)
+{
+ struct sock *sk = skb->sk;
+
+ if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
+ sk = inet_reqsk(sk)->rsk_listener;
+ return sk;
+}
+
static inline struct inet_sock *inet_sk(const struct sock *sk)
{
return (struct inet_sock *)sk;
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index c9b2d5467477..23307da15f1d 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -4931,23 +4931,11 @@ static unsigned int selinux_ipv4_output(void *priv,
return selinux_ip_output(skb, PF_INET);
}
-/* SYNACK messages might be attached to request sockets.
- * To get back to sk_security, we need to look at the listener.
- */
-static struct sock *selinux_skb_sk(const struct sk_buff *skb)
-{
- struct sock *sk = skb->sk;
-
- if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
- sk = inet_reqsk(sk)->rsk_listener;
- return sk;
-}
-
static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb,
int ifindex,
u16 family)
{
- struct sock *sk = selinux_skb_sk(skb);
+ struct sock *sk = skb_to_full_sk(skb);
struct sk_security_struct *sksec;
struct common_audit_data ad;
struct lsm_network_audit net = {0,};
@@ -5002,7 +4990,7 @@ static unsigned int selinux_ip_postroute(struct sk_buff
*skb,
if (!secmark_active && !peerlbl_active)
return NF_ACCEPT;
- sk = selinux_skb_sk(skb);
+ sk = skb_to_full_sk(skb);
#ifdef CONFIG_XFRM
/* If skb->dst->xfrm is non-NULL then the packet is undergoing an IPsec
diff --git a/security/selinux/netlabel.c b/security/selinux/netlabel.c
index 0364120d1ec8..1f989a539fd4 100644
--- a/security/selinux/netlabel.c
+++ b/security/selinux/netlabel.c
@@ -245,7 +245,7 @@ int selinux_netlbl_skbuff_setsid(struct sk_buff *skb,
/* if this is a locally generated packet check to see if it is already
* being labeled by it's parent socket, if it is just exit */
- sk = skb->sk;
+ sk = skb_to_full_sk(skb);
if (sk != NULL) {
struct sk_security_struct *sksec = sk->sk_security;
if (sksec->nlbl_state != NLBL_REQSKB)
--
2.6.0.rc2.230.g3dd15c0
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