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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
Download Patch File Download Diff File Expand all files Collapse all files

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);