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selinux: do not report error on connect(AF_UNSPEC)

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calling connect(AF_UNSPEC) on an already connected TCP socket is an
established way to disconnect() such socket. After commit 68741a8ada
("selinux: Fix ltp test connect-syscall failure") it no longer works
and, in the above scenario connect() fails with EAFNOSUPPORT.

Fix the above falling back to the generic/old code when the address family
is not AF_INET{4,6}, but leave the SCTP code path untouched, as it has
specific constraints.

Fixes: 68741a8ada ("selinux: Fix ltp test connect-syscall failure")
Reported-by: Tom Deseyn <tdeseyn@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2019-05-08 15:32:51 +02:00 committed by David S. Miller
parent c264ed44d8
commit c7e0d6cca8
1 changed files with 4 additions and 4 deletions
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8
security/selinux/hooks.c
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@ -4649,7 +4649,7 @@ static int selinux_socket_connect_helper(struct socket *sock,
struct lsm_network_audit net = {0,};
struct sockaddr_in *addr4 = NULL;
struct sockaddr_in6 *addr6 = NULL;
unsigned short snum;
unsigned short snum = 0;
u32 sid, perm;
/* sctp_connectx(3) calls via selinux_sctp_bind_connect()
@ -4674,12 +4674,12 @@ static int selinux_socket_connect_helper(struct socket *sock,
break;
default:
/* Note that SCTP services expect -EINVAL, whereas
* others expect -EAFNOSUPPORT.
* others must handle this at the protocol level:
* connect(AF_UNSPEC) on a connected socket is
* a documented way disconnect the socket.
*/
if (sksec->sclass == SECCLASS_SCTP_SOCKET)
return -EINVAL;
else
return -EAFNOSUPPORT;
}
err = sel_netport_sid(sk->sk_protocol, snum, &sid);