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* [PATCH v2] selinux: do not report error on connect(AF_UNSPEC)
@ 2019-05-10 13:47 Paolo Abeni
  2019-05-10 15:32 ` Paul Moore
  0 siblings, 1 reply; 4+ messages in thread
From: Paolo Abeni @ 2019-05-10 13:47 UTC (permalink / raw)
  To: selinux; +Cc: Paul Moore, Tom Deseyn, Richard Haines, Marcelo Ricardo Leitner

calling connect(AF_UNSPEC) on an already connected TCP socket is an
established way to disconnect() such socket. After commit 68741a8adab9
("selinux: Fix ltp test connect-syscall failure") it no longer works
and, in the above scenario connect() fails with EAFNOSUPPORT.

Fix the above skipping the checks when the address family is not
AF_INET{4,6} - we don't have any port to validate, but leave the
SCTP code path untouched, as it has specific constraints.

Fixes: 68741a8adab9 ("selinux: Fix ltp test connect-syscall failure")
Reported-by: Tom Deseyn <tdeseyn@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
v1 -> v2:
 - avoid validation for AF_UNSPEC
---
 security/selinux/hooks.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index c61787b15f27..bccc4b3e6f57 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -4674,12 +4674,13 @@ 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;
+			return 0;
 		}
 
 		err = sel_netport_sid(sk->sk_protocol, snum, &sid);
-- 
2.20.1


^ permalink raw reply related	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2019-05-10 16:09 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-05-10 13:47 [PATCH v2] selinux: do not report error on connect(AF_UNSPEC) Paolo Abeni
2019-05-10 15:32 ` Paul Moore
2019-05-10 15:51   ` Paolo Abeni
2019-05-10 16:09     ` Paul Moore

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