[PATCH 12/97] LSM: Use lsm_export in the getpeersec_dgram hooks

[Casey Schaufler]

Convert the getpeersec_dgram hooks to use the lsm_export
structure instead of a u32 secid. There is some scaffolding
involved that will be removed when security_getpeersec_dgram()
is updated.

Signed-off-by: Casey Schaufler <casey at schaufler-ca.com>
---
 include/linux/lsm_hooks.h  |  7 ++++---
 security/apparmor/lsm.c    |  3 ++-
 security/security.c        | 13 ++++++++++---
 security/selinux/hooks.c   |  6 ++++--
 security/smack/smack_lsm.c |  5 +++--
 5 files changed, 23 insertions(+), 11 deletions(-)

diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 796eb441be95..d4f260812c20 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -865,9 +865,9 @@
  *	the IP_PASSSEC option via getsockopt.  It can then retrieve the
  *	security state returned by this hook for a packet via the SCM_SECURITY
  *	ancillary message type.
+ *	@sock is the socket
  *	@skb is the skbuff for the packet being queried
- *	@secdata is a pointer to a buffer in which to copy the security data
- *	@seclen is the maximum length for @secdata
+ *	@l is a pointer to a buffer in which to copy the security data
  *	Return 0 on success, error on failure.
  * @sk_alloc_security:
  *	Allocate and attach a security structure to the sk->sk_security field,
@@ -1692,7 +1692,8 @@ union security_list_options {
 					char __user *optval,
 					int __user *optlen, unsigned len);
 	int (*socket_getpeersec_dgram)(struct socket *sock,
-					struct sk_buff *skb, u32 *secid);
+					struct sk_buff *skb,
+					struct lsm_export *l);
 	int (*sk_alloc_security)(struct sock *sk, int family, gfp_t priority);
 	void (*sk_free_security)(struct sock *sk);
 	void (*sk_clone_security)(const struct sock *sk, struct sock *newsk);
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 377fa4ed1518..0f8e671df5fe 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -1096,7 +1096,8 @@ static int apparmor_socket_getpeersec_stream(struct socket *sock,
  * Sets the netlabel socket state on sk from parent
  */
 static int apparmor_socket_getpeersec_dgram(struct socket *sock,
-					    struct sk_buff *skb, u32 *secid)
+					    struct sk_buff *skb,
+					    struct lsm_export *l)
 
 {
 	/* TODO: requires secid support */
diff --git a/security/security.c b/security/security.c
index 1a29fe08a5d9..bbb206b01e8e 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2131,10 +2131,17 @@ int security_socket_getpeersec_stream(struct socket *sock, char __user *optval,
 				optval, optlen, len);
 }
 
-int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
+int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb,
+				     u32 *secid)
 {
-	return call_int_hook(socket_getpeersec_dgram, -ENOPROTOOPT, sock,
-			     skb, secid);
+	int rc;
+	struct lsm_export data = { .flags = LSM_EXPORT_NONE };
+
+	rc = call_int_hook(socket_getpeersec_dgram, -ENOPROTOOPT, sock, skb,
+			   &data);
+
+	lsm_export_secid(&data, secid);
+	return rc;
 }
 EXPORT_SYMBOL(security_socket_getpeersec_dgram);
 
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index efcd905bdabf..1004aa4fc5db 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -4845,7 +4845,9 @@ static int selinux_socket_getpeersec_stream(struct socket *sock,
 	return err;
 }
 
-static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
+static int selinux_socket_getpeersec_dgram(struct socket *sock,
+					   struct sk_buff *skb,
+					   struct lsm_export *l)
 {
 	u32 peer_secid = SECSID_NULL;
 	u16 family;
@@ -4867,7 +4869,7 @@ static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *
 		selinux_skb_peerlbl_sid(skb, family, &peer_secid);
 
 out:
-	*secid = peer_secid;
+	selinux_export_secid(l, peer_secid);
 	if (peer_secid == SECSID_NULL)
 		return -EINVAL;
 	return 0;
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 0e1f6ef25eb2..0bed974b833b 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -3887,7 +3887,8 @@ static int smack_socket_getpeersec_stream(struct socket *sock,
  * Sets the netlabel socket state on sk from parent
  */
 static int smack_socket_getpeersec_dgram(struct socket *sock,
-					 struct sk_buff *skb, u32 *secid)
+					 struct sk_buff *skb,
+					 struct lsm_export *l)
 
 {
 	struct netlbl_lsm_secattr secattr;
@@ -3938,7 +3939,7 @@ static int smack_socket_getpeersec_dgram(struct socket *sock,
 #endif
 		break;
 	}
-	*secid = s;
+	smack_export_secid(l, s);
 	if (s == 0)
 		return -EINVAL;
 	return 0;
-- 
2.17.0