From: Paolo Abeni Date: Wed, 8 May 2019 13:32:51 +0000 (+0200) Subject: selinux: do not report error on connect(AF_UNSPEC) X-Git-Tag: v4.19.44~15 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=dfdfad3d188f6c524c06b469d3bbfe6af5004f71;p=platform%2Fkernel%2Flinux-rpi3.git selinux: do not report error on connect(AF_UNSPEC) [ Upstream commit c7e0d6cca86581092cbbf2cd868b3601495554cf ] 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 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: 68741a8adab9 ("selinux: Fix ltp test connect-syscall failure") Reported-by: Tom Deseyn Signed-off-by: Paolo Abeni Reviewed-by: Marcelo Ricardo Leitner Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index cba19b8..70bad15 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -4800,7 +4800,7 @@ 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() @@ -4823,12 +4823,12 @@ 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);