[PATCH net v6 3/3] net: prevent address rewrite in kernel_bind()

[Jordan Rife <jrife@xxxxxxxxxx>]

Similar to the change in commit 0bdf399342c5("net: Avoid address
overwrite in kernel_connect"), BPF hooks run on bind may rewrite the
address passed to kernel_bind(). This change

1) Makes a copy of the bind address in kernel_bind() to insulate
   callers.
2) Replaces direct calls to sock->ops->bind() in net with kernel_bind()

Link: https://lore.kernel.org/netdev/20230912013332.2048422-1-jrife@xxxxxxxxxx/
Fixes: 4fbac77d2d09 ("bpf: Hooks for sys_bind")
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Willem de Bruijn <willemb@xxxxxxxxxx>
Signed-off-by: Jordan Rife <jrife@xxxxxxxxxx>
---
 net/netfilter/ipvs/ip_vs_sync.c | 4 ++--
 net/rds/tcp_connect.c           | 2 +-
 net/rds/tcp_listen.c            | 2 +-
 net/socket.c                    | 7 ++++++-
 4 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c
index 6e4ed1e11a3b7..4174076c66fa7 100644
--- a/net/netfilter/ipvs/ip_vs_sync.c
+++ b/net/netfilter/ipvs/ip_vs_sync.c
@@ -1439,7 +1439,7 @@ static int bind_mcastif_addr(struct socket *sock, struct 
net_device *dev)
        sin.sin_addr.s_addr  = addr;
        sin.sin_port         = 0;
 
-       return sock->ops->bind(sock, (struct sockaddr*)&sin, sizeof(sin));
+       return kernel_bind(sock, (struct sockaddr *)&sin, sizeof(sin));
 }
 
 static void get_mcast_sockaddr(union ipvs_sockaddr *sa, int *salen,
@@ -1546,7 +1546,7 @@ static int make_receive_sock(struct netns_ipvs *ipvs, int 
id,
 
        get_mcast_sockaddr(&mcast_addr, &salen, &ipvs->bcfg, id);
        sock->sk->sk_bound_dev_if = dev->ifindex;
-       result = sock->ops->bind(sock, (struct sockaddr *)&mcast_addr, salen);
+       result = kernel_bind(sock, (struct sockaddr *)&mcast_addr, salen);
        if (result < 0) {
                pr_err("Error binding to the multicast addr\n");
                goto error;
diff --git a/net/rds/tcp_connect.c b/net/rds/tcp_connect.c
index d788c6d28986f..a0046e99d6df7 100644
--- a/net/rds/tcp_connect.c
+++ b/net/rds/tcp_connect.c
@@ -145,7 +145,7 @@ int rds_tcp_conn_path_connect(struct rds_conn_path *cp)
                addrlen = sizeof(sin);
        }
 
-       ret = sock->ops->bind(sock, addr, addrlen);
+       ret = kernel_bind(sock, addr, addrlen);
        if (ret) {
                rdsdebug("bind failed with %d at address %pI6c\n",
                         ret, &conn->c_laddr);
diff --git a/net/rds/tcp_listen.c b/net/rds/tcp_listen.c
index 014fa24418c12..53b3535a1e4a8 100644
--- a/net/rds/tcp_listen.c
+++ b/net/rds/tcp_listen.c
@@ -306,7 +306,7 @@ struct socket *rds_tcp_listen_init(struct net *net, bool 
isv6)
                addr_len = sizeof(*sin);
        }
 
-       ret = sock->ops->bind(sock, (struct sockaddr *)&ss, addr_len);
+       ret = kernel_bind(sock, (struct sockaddr *)&ss, addr_len);
        if (ret < 0) {
                rdsdebug("could not bind %s listener socket: %d\n",
                         isv6 ? "IPv6" : "IPv4", ret);
diff --git a/net/socket.c b/net/socket.c
index 107a257a75186..3408bd6bb1e5a 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -3518,7 +3518,12 @@ static long compat_sock_ioctl(struct file *file, 
unsigned int cmd,
 
 int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
 {
-       return READ_ONCE(sock->ops)->bind(sock, addr, addrlen);
+       struct sockaddr_storage address;
+
+       memcpy(&address, addr, addrlen);
+
+       return READ_ONCE(sock->ops)->bind(sock, (struct sockaddr *)&address,
+                                         addrlen);
 }
 EXPORT_SYMBOL(kernel_bind);
 
-- 
2.42.0.515.g380fc7ccd1-goog