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net: prevent address rewrite in kernel_bind()

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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@google.com/
Fixes: 4fbac77d2d ("bpf: Hooks for sys_bind")
Cc: stable@vger.kernel.org
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Jordan Rife <jrife@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jordan Rife 2023-09-21 18:46:42 -05:00 committed by David S. Miller
parent 86a7e0b69b
commit c889a99a21
4 changed files with 10 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
net/netfilter/ipvs/ip_vs_sync.c
View File

@ -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;

2
net/rds/tcp_connect.c
View File

@ -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);

2
net/rds/tcp_listen.c
View File

@ -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);

7
net/socket.c
View File

@ -3516,7 +3516,12 @@ 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);