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Message-ID: <20230919004644.148236-1-jrife@google.com>
Date: Mon, 18 Sep 2023 19:46:44 -0500
From: Jordan Rife <jrife@...gle.com>
To: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
pabeni@...hat.com, willemdebruijn.kernel@...il.com, netdev@...r.kernel.org
Cc: dborkman@...nel.org, philipp.reisner@...bit.com, lars.ellenberg@...bit.com,
christoph.boehmwalder@...bit.com, axboe@...nel.dk, airlied@...hat.com,
chengyou@...ux.alibaba.com, kaishen@...ux.alibaba.com, jgg@...pe.ca,
leon@...nel.org, bmt@...ich.ibm.com, isdn@...ux-pingi.de, ccaulfie@...hat.com,
teigland@...hat.com, mark@...heh.com, jlbec@...lplan.org,
joseph.qi@...ux.alibaba.com, sfrench@...ba.org, pc@...guebit.com,
lsahlber@...hat.com, sprasad@...rosoft.com, tom@...pey.com,
horms@...ge.net.au, ja@....bg, pablo@...filter.org, kadlec@...filter.org,
fw@...len.de, santosh.shilimkar@...cle.com, Jordan Rife <jrife@...gle.com>
Subject: [PATCH net v3 3/3] net: prevent address rewrite in kernel_bind()
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() with kernel_bind()
Link: https://lore.kernel.org/netdev/20230912013332.2048422-1-jrife@google.com/
Fixes: 4fbac77d2d09 ("bpf: Hooks for sys_bind")
Signed-off-by: Jordan Rife <jrife@...gle.com>
---
v2->v3: Add "Fixes" tag. Check for positivity in addrlen sanity check.
v1->v2: Split up original patch into patch series. Insulate
sock->ops->bind() calls with kernel_bind().
drivers/block/drbd/drbd_receiver.c | 4 ++--
drivers/char/agp/alpha-agp.c | 2 +-
drivers/infiniband/hw/erdma/erdma_cm.c | 6 +++---
drivers/infiniband/sw/siw/siw_cm.c | 10 +++++-----
drivers/isdn/mISDN/l1oip_core.c | 4 ++--
fs/dlm/lowcomms.c | 7 +++----
fs/ocfs2/cluster/tcp.c | 6 +++---
fs/smb/client/connect.c | 6 +++---
net/netfilter/ipvs/ip_vs_sync.c | 4 ++--
net/rds/tcp_connect.c | 2 +-
net/rds/tcp_listen.c | 2 +-
net/socket.c | 7 +++++++
12 files changed, 33 insertions(+), 27 deletions(-)
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 9b2660e990a98..752759ed22b8c 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -638,7 +638,7 @@ static struct socket *drbd_try_connect(struct drbd_connection *connection)
* a free one dynamically.
*/
what = "bind before connect";
- err = sock->ops->bind(sock, (struct sockaddr *) &src_in6, my_addr_len);
+ err = kernel_bind(sock, (struct sockaddr *)&src_in6, my_addr_len);
if (err < 0)
goto out;
@@ -725,7 +725,7 @@ static int prepare_listen_socket(struct drbd_connection *connection, struct acce
drbd_setbufsize(s_listen, sndbuf_size, rcvbuf_size);
what = "bind before listen";
- err = s_listen->ops->bind(s_listen, (struct sockaddr *)&my_addr, my_addr_len);
+ err = kernel_bind(s_listen, (struct sockaddr *)&my_addr, my_addr_len);
if (err < 0)
goto out;
diff --git a/drivers/char/agp/alpha-agp.c b/drivers/char/agp/alpha-agp.c
index c9bf2c2198418..f251fedfb4840 100644
--- a/drivers/char/agp/alpha-agp.c
+++ b/drivers/char/agp/alpha-agp.c
@@ -96,7 +96,7 @@ static int alpha_core_agp_insert_memory(struct agp_memory *mem, off_t pg_start,
if ((pg_start + mem->page_count) > num_entries)
return -EINVAL;
- status = agp->ops->bind(agp, pg_start, mem);
+ status = kernel_bind(agp, pg_start, mem);
mb();
alpha_core_agp_tlbflush(mem);
diff --git a/drivers/infiniband/hw/erdma/erdma_cm.c b/drivers/infiniband/hw/erdma/erdma_cm.c
index e2b89e7bbe2b8..674702d159c29 100644
--- a/drivers/infiniband/hw/erdma/erdma_cm.c
+++ b/drivers/infiniband/hw/erdma/erdma_cm.c
@@ -990,7 +990,7 @@ static int kernel_bindconnect(struct socket *s, struct sockaddr *laddr,
int ret;
sock_set_reuseaddr(s->sk);
- ret = s->ops->bind(s, laddr, laddrlen);
+ ret = kernel_bind(s, laddr, laddrlen);
if (ret)
return ret;
ret = kernel_connect(s, raddr, raddrlen, flags);
@@ -1309,8 +1309,8 @@ int erdma_create_listen(struct iw_cm_id *id, int backlog)
if (ipv4_is_zeronet(laddr->sin_addr.s_addr))
s->sk->sk_bound_dev_if = dev->netdev->ifindex;
- ret = s->ops->bind(s, (struct sockaddr *)laddr,
- sizeof(struct sockaddr_in));
+ ret = kernel_bind(s, (struct sockaddr *)laddr,
+ sizeof(struct sockaddr_in));
if (ret)
goto error;
diff --git a/drivers/infiniband/sw/siw/siw_cm.c b/drivers/infiniband/sw/siw/siw_cm.c
index 05624f424153e..d05e0eeee9244 100644
--- a/drivers/infiniband/sw/siw/siw_cm.c
+++ b/drivers/infiniband/sw/siw/siw_cm.c
@@ -1324,7 +1324,7 @@ static int kernel_bindconnect(struct socket *s, struct sockaddr *laddr,
return rv;
}
- rv = s->ops->bind(s, laddr, size);
+ rv = kernel_bind(s, laddr, size);
if (rv < 0)
return rv;
@@ -1793,8 +1793,8 @@ int siw_create_listen(struct iw_cm_id *id, int backlog)
if (ipv4_is_zeronet(laddr->sin_addr.s_addr))
s->sk->sk_bound_dev_if = sdev->netdev->ifindex;
- rv = s->ops->bind(s, (struct sockaddr *)laddr,
- sizeof(struct sockaddr_in));
+ rv = kernel_bind(s, (struct sockaddr *)laddr,
+ sizeof(struct sockaddr_in));
} else {
struct sockaddr_in6 *laddr = &to_sockaddr_in6(id->local_addr);
@@ -1811,8 +1811,8 @@ int siw_create_listen(struct iw_cm_id *id, int backlog)
if (ipv6_addr_any(&laddr->sin6_addr))
s->sk->sk_bound_dev_if = sdev->netdev->ifindex;
- rv = s->ops->bind(s, (struct sockaddr *)laddr,
- sizeof(struct sockaddr_in6));
+ rv = kernel_bind(s, (struct sockaddr *)laddr,
+ sizeof(struct sockaddr_in6));
}
if (rv) {
siw_dbg(id->device, "socket bind error: %d\n", rv);
diff --git a/drivers/isdn/mISDN/l1oip_core.c b/drivers/isdn/mISDN/l1oip_core.c
index f010b35a05313..681147e1fc843 100644
--- a/drivers/isdn/mISDN/l1oip_core.c
+++ b/drivers/isdn/mISDN/l1oip_core.c
@@ -675,8 +675,8 @@ l1oip_socket_thread(void *data)
hc->sin_remote.sin_port = htons((unsigned short)hc->remoteport);
/* bind to incoming port */
- if (socket->ops->bind(socket, (struct sockaddr *)&hc->sin_local,
- sizeof(hc->sin_local))) {
+ if (kernel_bind(socket, (struct sockaddr *)&hc->sin_local,
+ sizeof(hc->sin_local))) {
printk(KERN_ERR "%s: Failed to bind socket to port %d.\n",
__func__, hc->localport);
ret = -EINVAL;
diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 1cf796b97eb65..73ab179833fbd 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -1805,8 +1805,7 @@ static int dlm_tcp_bind(struct socket *sock)
memcpy(&src_addr, &dlm_local_addr[0], sizeof(src_addr));
make_sockaddr(&src_addr, 0, &addr_len);
- result = sock->ops->bind(sock, (struct sockaddr *)&src_addr,
- addr_len);
+ result = kernel_bind(sock, (struct sockaddr *)&src_addr, addr_len);
if (result < 0) {
/* This *may* not indicate a critical error */
log_print("could not bind for connect: %d", result);
@@ -1850,8 +1849,8 @@ static int dlm_tcp_listen_bind(struct socket *sock)
/* Bind to our port */
make_sockaddr(&dlm_local_addr[0], dlm_config.ci_tcp_port, &addr_len);
- return sock->ops->bind(sock, (struct sockaddr *)&dlm_local_addr[0],
- addr_len);
+ return kernel_bind(sock, (struct sockaddr *)&dlm_local_addr[0],
+ addr_len);
}
static const struct dlm_proto_ops dlm_tcp_ops = {
diff --git a/fs/ocfs2/cluster/tcp.c b/fs/ocfs2/cluster/tcp.c
index ead7c287ff373..3a4a7a521476d 100644
--- a/fs/ocfs2/cluster/tcp.c
+++ b/fs/ocfs2/cluster/tcp.c
@@ -1614,8 +1614,8 @@ static void o2net_start_connect(struct work_struct *work)
myaddr.sin_addr.s_addr = mynode->nd_ipv4_address;
myaddr.sin_port = htons(0); /* any port */
- ret = sock->ops->bind(sock, (struct sockaddr *)&myaddr,
- sizeof(myaddr));
+ ret = kernel_bind(sock, (struct sockaddr *)&myaddr,
+ sizeof(myaddr));
if (ret) {
mlog(ML_ERROR, "bind failed with %d at address %pI4\n",
ret, &mynode->nd_ipv4_address);
@@ -1998,7 +1998,7 @@ static int o2net_open_listening_sock(__be32 addr, __be16 port)
INIT_WORK(&o2net_listen_work, o2net_accept_many);
sock->sk->sk_reuse = SK_CAN_REUSE;
- ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin));
+ ret = kernel_bind(sock, (struct sockaddr *)&sin, sizeof(sin));
if (ret < 0) {
printk(KERN_ERR "o2net: Error %d while binding socket at "
"%pI4:%u\n", ret, &addr, ntohs(port));
diff --git a/fs/smb/client/connect.c b/fs/smb/client/connect.c
index b7764cd57e035..6dcc1cd41b8c5 100644
--- a/fs/smb/client/connect.c
+++ b/fs/smb/client/connect.c
@@ -2891,9 +2891,9 @@ bind_socket(struct TCP_Server_Info *server)
if (server->srcaddr.ss_family != AF_UNSPEC) {
/* Bind to the specified local IP address */
struct socket *socket = server->ssocket;
- rc = socket->ops->bind(socket,
- (struct sockaddr *) &server->srcaddr,
- sizeof(server->srcaddr));
+ rc = kernel_bind(socket,
+ (struct sockaddr *)&server->srcaddr,
+ sizeof(server->srcaddr));
if (rc < 0) {
struct sockaddr_in *saddr4;
struct sockaddr_in6 *saddr6;
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 2d34a69b84406..9741b408bf5c2 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -3519,6 +3519,13 @@ static long compat_sock_ioctl(struct file *file, unsigned int cmd,
int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
{
+ struct sockaddr_storage address;
+
+ if (addrlen < 0 || addrlen > sizeof(address))
+ return -EINVAL;
+
+ memcpy(&address, addr, addrlen);
+
return READ_ONCE(sock->ops)->bind(sock, addr, addrlen);
}
EXPORT_SYMBOL(kernel_bind);
--
2.42.0.459.ge4e396fd5e-goog
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