netdev - [PATCH] net/tipc: initialize security state for new connection socket

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Date:	Tue,  7 Jul 2015 09:43:45 -0400
From:	Stephen Smalley <sds@...ho.nsa.gov>
To:	jon.maloy@...csson.com, ying.xue@...driver.com
Cc:	paul@...l-moore.com, linux-security-module@...r.kernel.org,
	netdev@...r.kernel.org, Stephen Smalley <sds@...ho.nsa.gov>
Subject: [PATCH] net/tipc: initialize security state for new connection socket

Calling connect() with an AF_TIPC socket would trigger a series
of error messages from SELinux along the lines of:
SELinux: Invalid class 0
type=AVC msg=audit(1434126658.487:34500): avc:  denied  { <unprintable> }
  for pid=292 comm="kworker/u16:5" scontext=system_u:system_r:kernel_t:s0
  tcontext=system_u:object_r:unlabeled_t:s0 tclass=<unprintable>
  permissive=0

This was due to a failure to initialize the security state of the new
connection sock by the tipc code, leaving it with junk in the security
class field and an unlabeled secid.  Add a call to security_sk_clone()
to inherit the security state from the parent socket.

Reported-by: Tim Shearer <tim.shearer@...rturenetworks.com>
Signed-off-by: Stephen Smalley <sds@...ho.nsa.gov>
Acked-by: Paul Moore <paul@...l-moore.com>
---
 net/tipc/socket.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 46b6ed5..3a7567f 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -2007,6 +2007,7 @@ static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
 	res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1);
 	if (res)
 		goto exit;
+	security_sk_clone(sock->sk, new_sock->sk);
 
 	new_sk = new_sock->sk;
 	new_tsock = tipc_sk(new_sk);
-- 
2.1.0

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