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authorEric W. Biederman <ebiederm@xmission.com>2007-10-09 02:24:22 -0400
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-10 19:49:07 -0400
commit1b8d7ae42d02e483ad94035cca851e4f7fbecb40 (patch)
tree81f8cc0ee49ef99cc67dfed3dc7b7ecb510abf8b /net/unix/af_unix.c
parent457c4cbc5a3dde259d2a1f15d5f9785290397267 (diff)
[NET]: Make socket creation namespace safe.
This patch passes in the namespace a new socket should be created in and has the socket code do the appropriate reference counting. By virtue of this all socket create methods are touched. In addition the socket create methods are modified so that they will fail if you attempt to create a socket in a non-default network namespace. Failing if we attempt to create a socket outside of the default network namespace ensures that as we incrementally make the network stack network namespace aware we will not export functionality that someone has not audited and made certain is network namespace safe. Allowing us to partially enable network namespaces before all of the exotic protocols are supported. Any protocol layers I have missed will fail to compile because I now pass an extra parameter into the socket creation code. [ Integrated AF_IUCV build fixes from Andrew Morton... -DaveM ] Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/unix/af_unix.c')
-rw-r--r--net/unix/af_unix.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 2386090c3a16..10e73122c34c 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -594,7 +594,7 @@ static struct proto unix_proto = {
594 */ 594 */
595static struct lock_class_key af_unix_sk_receive_queue_lock_key; 595static struct lock_class_key af_unix_sk_receive_queue_lock_key;
596 596
597static struct sock * unix_create1(struct socket *sock) 597static struct sock * unix_create1(struct net *net, struct socket *sock)
598{ 598{
599 struct sock *sk = NULL; 599 struct sock *sk = NULL;
600 struct unix_sock *u; 600 struct unix_sock *u;
@@ -602,7 +602,7 @@ static struct sock * unix_create1(struct socket *sock)
602 if (atomic_read(&unix_nr_socks) >= 2*get_max_files()) 602 if (atomic_read(&unix_nr_socks) >= 2*get_max_files())
603 goto out; 603 goto out;
604 604
605 sk = sk_alloc(PF_UNIX, GFP_KERNEL, &unix_proto, 1); 605 sk = sk_alloc(net, PF_UNIX, GFP_KERNEL, &unix_proto, 1);
606 if (!sk) 606 if (!sk)
607 goto out; 607 goto out;
608 608
@@ -628,8 +628,11 @@ out:
628 return sk; 628 return sk;
629} 629}
630 630
631static int unix_create(struct socket *sock, int protocol) 631static int unix_create(struct net *net, struct socket *sock, int protocol)
632{ 632{
633 if (net != &init_net)
634 return -EAFNOSUPPORT;
635
633 if (protocol && protocol != PF_UNIX) 636 if (protocol && protocol != PF_UNIX)
634 return -EPROTONOSUPPORT; 637 return -EPROTONOSUPPORT;
635 638
@@ -655,7 +658,7 @@ static int unix_create(struct socket *sock, int protocol)
655 return -ESOCKTNOSUPPORT; 658 return -ESOCKTNOSUPPORT;
656 } 659 }
657 660
658 return unix_create1(sock) ? 0 : -ENOMEM; 661 return unix_create1(net, sock) ? 0 : -ENOMEM;
659} 662}
660 663
661static int unix_release(struct socket *sock) 664static int unix_release(struct socket *sock)
@@ -1039,7 +1042,7 @@ static int unix_stream_connect(struct socket *sock, struct sockaddr *uaddr,
1039 err = -ENOMEM; 1042 err = -ENOMEM;
1040 1043
1041 /* create new sock for complete connection */ 1044 /* create new sock for complete connection */
1042 newsk = unix_create1(NULL); 1045 newsk = unix_create1(sk->sk_net, NULL);
1043 if (newsk == NULL) 1046 if (newsk == NULL)
1044 goto out; 1047 goto out;
1045 1048