| Message ID | 20240318194902.3290795-1-khazhy@google.com |
|---|---|
| State | New |
| Headers | show |
| Series | [1/2] iscsi_tcp: do not bind sockets that already have extra callbacks | expand |
On 3/18/24 2:49 PM, Khazhismel Kumykov wrote: > This attempts to avoid a situation where a misbehaving iscsi daemon > passes a socket for a different iSCSI connection to BIND_CONN - which > would result in infinite recursion and stack overflow. This will > also prevent passing *other* sockets which had sk_user_data overridden, > but that wouldn't have been safe anyways - since we throw away that > pointer anyways. This does not cover all hypothetical scenarios where we > pass bad sockets to BIND_CONN. > > This also papers over a different bug - we allow a daemon to call > BIND_CONN twice for the same connection - which would result in, at the > least, failing to uninitialize/teardown the previous socket, which will > be addressed separately. > > Signed-off-by: Khazhismel Kumykov <khazhy@google.com> > --- > drivers/scsi/iscsi_tcp.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c > index 8e14cea15f98..e8ed60b777c6 100644 > --- a/drivers/scsi/iscsi_tcp.c > +++ b/drivers/scsi/iscsi_tcp.c > @@ -725,7 +725,7 @@ iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session, > } > > err = -EINVAL; > - if (!sk_is_tcp(sock->sk)) > + if (!sk_is_tcp(sock->sk) || sock->sk->sk_user_data) > goto free_socket; > > err = iscsi_conn_bind(cls_session, cls_conn, is_leading); Reviewed-by: Mike Christie <michael.christie@oracle.com>
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c index 8e14cea15f98..e8ed60b777c6 100644 --- a/drivers/scsi/iscsi_tcp.c +++ b/drivers/scsi/iscsi_tcp.c @@ -725,7 +725,7 @@ iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session, } err = -EINVAL; - if (!sk_is_tcp(sock->sk)) + if (!sk_is_tcp(sock->sk) || sock->sk->sk_user_data) goto free_socket; err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
This attempts to avoid a situation where a misbehaving iscsi daemon passes a socket for a different iSCSI connection to BIND_CONN - which would result in infinite recursion and stack overflow. This will also prevent passing *other* sockets which had sk_user_data overridden, but that wouldn't have been safe anyways - since we throw away that pointer anyways. This does not cover all hypothetical scenarios where we pass bad sockets to BIND_CONN. This also papers over a different bug - we allow a daemon to call BIND_CONN twice for the same connection - which would result in, at the least, failing to uninitialize/teardown the previous socket, which will be addressed separately. Signed-off-by: Khazhismel Kumykov <khazhy@google.com> --- drivers/scsi/iscsi_tcp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)