[PATCH] selinux: fix the default socket labeling in sock_graft()

[Paul Moore <pmoore@redhat.com>]

The sock_graft() hook has special handling for AF_INET, AF_INET, and
AF_UNIX sockets as those address families have special hooks which
label the sock before it is attached its associated socket.
Unfortunately, the sock_graft() hook was missing a default approach
to labeling sockets which meant that any other address family which
made use of connections or the accept() syscall would find the
returned socket to be in an "unlabeled" state.  This was recently
demonstrated by the kcrypto/AF_ALG subsystem and the newly released
cryptsetup package (cryptsetup v1.6.5 and later).

This patch preserves the special handling in selinux_sock_graft(),
but adds a default behavior - setting the sock's label equal to the
associated socket - which resolves the problem with AF_ALG and
presumably any other address family which makes use of accept().

Cc: stable@vger.kernel.org
Signed-off-by: Paul Moore <pmoore@redhat.com>
Tested-by: Milan Broz <gmazyland@gmail.com>
---
 security/selinux/hooks.c |   12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 336f0a0..39f16d0 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -4499,9 +4499,17 @@ static void selinux_sock_graft(struct sock *sk, struct socket *parent)
 	struct inode_security_struct *isec = SOCK_INODE(parent)->i_security;
 	struct sk_security_struct *sksec = sk->sk_security;
 
-	if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6 ||
-	    sk->sk_family == PF_UNIX)
+	switch (sk->sk_family) {
+	case PF_INET:
+	case PF_INET6:
+	case PF_UNIX:
 		isec->sid = sksec->sid;
+		break;
+	default:
+		/* by default there is no special labeling mechanism for the
+		 * sock label so inherit the label from the parent socket */
+		sksec->sid = isec->sid;
+	}
 	sksec->sclass = isec->sclass;
 }