af_netlink: force credentials passing [CVE-2012-3520]

Pablo Neira Ayuso discovered that avahi and
potentially NetworkManager accept spoofed Netlink messages because of a
kernel bug.  The kernel passes all-zero SCM_CREDENTIALS ancillary data
to the receiver if the sender did not provide such data, instead of not
including any such data at all or including the correct data from the
peer (as it is the case with AF_UNIX).

This bug was introduced in commit 16e572626961
(af_unix: dont send SCM_CREDENTIALS by default)

This patch forces passing credentials for netlink, as
before the regression.

Another fix would be to not add SCM_CREDENTIALS in
netlink messages if not provided by the sender, but it
might break some programs.

With help from Florian Weimer & Petr Matousek

This issue is designated as CVE-2012-3520

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Petr Matousek <pmatouse@redhat.com>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 6 insertions, 4 deletions

diff --git a/include/net/scm.h b/include/net/scm.h
index 079d7887dac1..7dc0854f0b38 100644
--- a/include/net/scm.h
+++ b/include/net/scm.h
@@ -70,9 +70,11 @@ static __inline__ void scm_destroy(struct scm_cookie *scm)
 }
 
 static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
-                               struct scm_cookie *scm)
+                               struct scm_cookie *scm, bool forcecreds)
 {
         memset(scm, 0, sizeof(*scm));
+        if (forcecreds)
+                scm_set_cred(scm, task_tgid(current), current_cred());
         unix_get_peersec_dgram(sock, scm);
         if (msg->msg_controllen <= 0)
                 return 0;
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 5463969da45b..1445d73533ed 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1362,7 +1362,7 @@ static int netlink_sendmsg(struct kiocb *kiocb, struct socket *sock,
         if (NULL == siocb->scm)
                 siocb->scm = &scm;
 
-        err = scm_send(sock, msg, siocb->scm);
+        err = scm_send(sock, msg, siocb->scm, true);
         if (err < 0)
                 return err;
 
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index e4768c180da2..c5ee4ff61364 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -1450,7 +1450,7 @@ static int unix_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock,
         if (NULL == siocb->scm)
                 siocb->scm = &tmp_scm;
         wait_for_unix_gc();
-        err = scm_send(sock, msg, siocb->scm);
+        err = scm_send(sock, msg, siocb->scm, false);
         if (err < 0)
                 return err;
 
@@ -1619,7 +1619,7 @@ static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
         if (NULL == siocb->scm)
                 siocb->scm = &tmp_scm;
         wait_for_unix_gc();
-        err = scm_send(sock, msg, siocb->scm);
+        err = scm_send(sock, msg, siocb->scm, false);
         if (err < 0)
                 return err;