On Thu, Jun 22, 2023 at 05:25:55PM +0200, Stefano Garzarella wrote:
> On Sat, Jun 10, 2023 at 12:58:31AM +0000, Bobby Eshleman wrote:
> > This commit makes the bind table management functions in vsock usable
> > for different bind tables. For use by datagrams in a future patch.
> >
> > Signed-off-by: Bobby Eshleman <bobby.eshleman@xxxxxxxxxxxxx>
> > ---
> > net/vmw_vsock/af_vsock.c | 33 ++++++++++++++++++++++++++-------
> > 1 file changed, 26 insertions(+), 7 deletions(-)
> >
> > diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
> > index ef86765f3765..7a3ca4270446 100644
> > --- a/net/vmw_vsock/af_vsock.c
> > +++ b/net/vmw_vsock/af_vsock.c
> > @@ -230,11 +230,12 @@ static void __vsock_remove_connected(struct vsock_sock *vsk)
> > sock_put(&vsk->sk);
> > }
> >
> > -static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr)
> > +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);
> >
> > @@ -247,6 +248,11 @@ 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)
> > {
> > @@ -646,12 +652,17 @@ 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 (table_size < VSOCK_HASH_SIZE)
> > + return -1;
>
> Why we need this check now?
>
If the table_size is not at least VSOCK_HASH_SIZE then the
VSOCK_HASH(addr) used later could overflow the table.
Maybe this really deserves a WARN() and a comment?
> > +
> > if (!port)
> > port = get_random_u32_above(LAST_RESERVED_PORT);
> >
> > @@ -667,7 +678,8 @@ 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;
> > }
> > @@ -684,7 +696,8 @@ 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;
> > }
> >
> > @@ -696,11 +709,17 @@ 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)
> > {
> >
> > --
> > 2.30.2
> >
>
> The rest seems okay to me, but I agree with Simon's suggestion.
>
> Stefano
>
Thanks,
Bobby
