netdev - [RFC PATCH net-next v6 04/14] af_vsock: generalize bind table functions

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20240710212555.1617795-5-amery.hung@bytedance.com>
Date: Wed, 10 Jul 2024 21:25:45 +0000
From: Amery Hung <ameryhung@...il.com>
To: stefanha@...hat.com,
	sgarzare@...hat.com,
	mst@...hat.com,
	jasowang@...hat.com,
	xuanzhuo@...ux.alibaba.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	kys@...rosoft.com,
	haiyangz@...rosoft.com,
	wei.liu@...nel.org,
	decui@...rosoft.com,
	bryantan@...are.com,
	vdasa@...are.com,
	pv-drivers@...are.com
Cc: dan.carpenter@...aro.org,
	simon.horman@...igine.com,
	oxffffaa@...il.com,
	kvm@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hyperv@...r.kernel.org,
	bpf@...r.kernel.org,
	bobby.eshleman@...edance.com,
	jiang.wang@...edance.com,
	amery.hung@...edance.com,
	ameryhung@...il.com,
	xiyou.wangcong@...il.com
Subject: [RFC PATCH net-next v6 04/14] af_vsock: generalize bind table functions

From: Bobby Eshleman <bobby.eshleman@...edance.com>

This commit makes the bind table management functions in vsock usable
for different bind tables. Future work will introduce a new table for
datagrams to avoid address collisions, and these functions will be used
there.

Signed-off-by: Bobby Eshleman <bobby.eshleman@...edance.com>
---
 net/vmw_vsock/af_vsock.c | 34 +++++++++++++++++++++++++++-------
 1 file changed, 27 insertions(+), 7 deletions(-)

diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index acc15e11700c..d571be9cdbf0 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -232,11 +232,12 @@ static void __vsock_remove_connected(struct vsock_sock *vsk)
 	sock_put(&vsk->sk);
 }
 
-static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr)
+static struct sock *vsock_find_bound_socket_common(struct sockaddr_vm *addr,
+						   struct list_head *bind_table)
 {
 	struct vsock_sock *vsk;
 
-	list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table) {
+	list_for_each_entry(vsk, bind_table, bound_table) {
 		if (vsock_addr_equals_addr(addr, &vsk->local_addr))
 			return sk_vsock(vsk);
 
@@ -249,6 +250,11 @@ static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr)
 	return NULL;
 }
 
+static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr)
+{
+	return vsock_find_bound_socket_common(addr, vsock_bound_sockets(addr));
+}
+
 static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src,
 						  struct sockaddr_vm *dst)
 {
@@ -671,12 +677,18 @@ static void vsock_pending_work(struct work_struct *work)
 
 /**** SOCKET OPERATIONS ****/
 
-static int __vsock_bind_connectible(struct vsock_sock *vsk,
-				    struct sockaddr_vm *addr)
+static int vsock_bind_common(struct vsock_sock *vsk,
+			     struct sockaddr_vm *addr,
+			     struct list_head *bind_table,
+			     size_t table_size)
 {
 	static u32 port;
 	struct sockaddr_vm new_addr;
 
+	if (WARN_ONCE(table_size < VSOCK_HASH_SIZE,
+		      "table size too small, may cause overflow"))
+		return -EINVAL;
+
 	if (!port)
 		port = get_random_u32_above(LAST_RESERVED_PORT);
 
@@ -692,7 +704,8 @@ static int __vsock_bind_connectible(struct vsock_sock *vsk,
 
 			new_addr.svm_port = port++;
 
-			if (!__vsock_find_bound_socket(&new_addr)) {
+			if (!vsock_find_bound_socket_common(&new_addr,
+							    &bind_table[VSOCK_HASH(addr)])) {
 				found = true;
 				break;
 			}
@@ -709,7 +722,8 @@ static int __vsock_bind_connectible(struct vsock_sock *vsk,
 			return -EACCES;
 		}
 
-		if (__vsock_find_bound_socket(&new_addr))
+		if (vsock_find_bound_socket_common(&new_addr,
+						   &bind_table[VSOCK_HASH(addr)]))
 			return -EADDRINUSE;
 	}
 
@@ -721,11 +735,17 @@ static int __vsock_bind_connectible(struct vsock_sock *vsk,
 	 * by AF_UNIX.
 	 */
 	__vsock_remove_bound(vsk);
-	__vsock_insert_bound(vsock_bound_sockets(&vsk->local_addr), vsk);
+	__vsock_insert_bound(&bind_table[VSOCK_HASH(&vsk->local_addr)], vsk);
 
 	return 0;
 }
 
+static int __vsock_bind_connectible(struct vsock_sock *vsk,
+				    struct sockaddr_vm *addr)
+{
+	return vsock_bind_common(vsk, addr, vsock_bind_table, VSOCK_HASH_SIZE + 1);
+}
+
 static int __vsock_bind_dgram(struct vsock_sock *vsk,
 			      struct sockaddr_vm *addr)
 {
-- 
2.20.1