[PATCH] selinux: Fix address length checks in connect hook

This patch fixes the address length checks in the selinux_socket_connect
hook to be no more restrictive than the underlying ipv4 and ipv6 code;
otherwise, this hook can reject valid connect calls.  This patch is in
response to a bug report where an application was calling connect on an
INET6 socket with an address that didn't include the optional scope id and
failing due to these checks.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 10fd51c..2253f38 100644 (file)
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3126,12 +3126,12 @@ static int selinux_socket_connect(struct socket *sock, struct sockaddr *address,
 
                if (sk->sk_family == PF_INET) {
                        addr4 = (struct sockaddr_in *)address;
-                       if (addrlen != sizeof(struct sockaddr_in))
+                       if (addrlen < sizeof(struct sockaddr_in))
                                return -EINVAL;
                        snum = ntohs(addr4->sin_port);
                } else {
                        addr6 = (struct sockaddr_in6 *)address;
-                       if (addrlen != sizeof(struct sockaddr_in6))
+                       if (addrlen < SIN6_LEN_RFC2133)
                                return -EINVAL;
                        snum = ntohs(addr6->sin6_port);
                }