linux-kernel - [PATCH 3.16.y-ckt 065/130] net/tipc: initialize security state for new connection socket

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Message-Id: <1441372118-5933-66-git-send-email-luis.henriques@canonical.com>
Date:	Fri,  4 Sep 2015 14:07:33 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Stephen Smalley <sds@...ho.nsa.gov>,
	"David S. Miller" <davem@...emloft.net>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 065/130] net/tipc: initialize security state for new connection socket

3.16.7-ckt17 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stephen Smalley <sds@...ho.nsa.gov>

commit fdd75ea8df370f206a8163786e7470c1277a5064 upstream.

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>
Acked-by: Ying Xue <ying.xue@...driver.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 net/tipc/socket.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 4093fd81edd5..9dee1aabcfc0 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -1696,6 +1696,7 @@ 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_port = &tipc_sk(new_sk)->port;
--
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