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https://github.com/torvalds/linux.git
synced 2024-11-23 12:42:02 +00:00
RDMA/cma: Fix use after free race in roce multicast join
The roce path triggers a work queue that continues to touch the id_priv
but doesn't hold any reference on it. Futher, unlike in the IB case, the
work queue is not fenced during rdma_destroy_id().
This can trigger a use after free if a destroy is triggered in the
incredibly narrow window after the queue_work and the work starting and
obtaining the handler_mutex.
The only purpose of this work queue is to run the ULP event callback from
the standard context, so switch the design to use the existing
cma_work_handler() scheme. This simplifies quite a lot of the flow:
- Use the cma_work_handler() callback to launch the work for roce. This
requires generating the event synchronously inside the
rdma_join_multicast(), which in turn means the dummy struct
ib_sa_multicast can become a simple stack variable.
- cm_work_handler() used the id_priv kref, so we can entirely eliminate
the kref inside struct cma_multicast. Since the cma_multicast never
leaks into an unprotected work queue the kfree can be done at the same
time as for IB.
- Eliminating the general multicast.ib requires using cma_set_mgid() in a
few places to recompute the mgid.
Fixes: 3c86aa70bf ("RDMA/cm: Add RDMA CM support for IBoE devices")
Link: https://lore.kernel.org/r/20200902081122.745412-9-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Jason Gunthorpe
parent
3788d2997b
commit
b5de0c60cc
@ -68,6 +68,9 @@ static const char * const cma_events[] = {
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[RDMA_CM_EVENT_TIMEWAIT_EXIT] = "timewait exit",
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};
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static void cma_set_mgid(struct rdma_id_private *id_priv, struct sockaddr *addr,
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union ib_gid *mgid);
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const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event)
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{
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size_t index = event;
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@ -345,13 +348,10 @@ struct ib_device *cma_get_ib_dev(struct cma_device *cma_dev)
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struct cma_multicast {
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struct rdma_id_private *id_priv;
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union {
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struct ib_sa_multicast *ib;
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} multicast;
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struct ib_sa_multicast *sa_mc;
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struct list_head list;
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void *context;
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struct sockaddr_storage addr;
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struct kref mcref;
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u8 join_state;
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};
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@ -363,12 +363,6 @@ struct cma_work {
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struct rdma_cm_event event;
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};
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struct iboe_mcast_work {
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struct work_struct work;
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struct rdma_id_private *id;
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struct cma_multicast *mc;
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};
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union cma_ip_addr {
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struct in6_addr ip6;
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struct {
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@ -475,14 +469,6 @@ static void cma_attach_to_dev(struct rdma_id_private *id_priv,
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rdma_start_port(cma_dev->device)];
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}
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static inline void release_mc(struct kref *kref)
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{
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struct cma_multicast *mc = container_of(kref, struct cma_multicast, mcref);
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kfree(mc->multicast.ib);
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kfree(mc);
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}
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static void cma_release_dev(struct rdma_id_private *id_priv)
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{
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mutex_lock(&lock);
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@ -1778,14 +1764,10 @@ static void cma_release_port(struct rdma_id_private *id_priv)
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static void destroy_mc(struct rdma_id_private *id_priv,
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struct cma_multicast *mc)
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{
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if (rdma_cap_ib_mcast(id_priv->id.device, id_priv->id.port_num)) {
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ib_sa_free_multicast(mc->multicast.ib);
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kfree(mc);
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return;
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}
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if (rdma_cap_ib_mcast(id_priv->id.device, id_priv->id.port_num))
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ib_sa_free_multicast(mc->sa_mc);
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if (rdma_protocol_roce(id_priv->id.device,
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id_priv->id.port_num)) {
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if (rdma_protocol_roce(id_priv->id.device, id_priv->id.port_num)) {
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struct rdma_dev_addr *dev_addr =
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&id_priv->id.route.addr.dev_addr;
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struct net_device *ndev = NULL;
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@ -1794,11 +1776,15 @@ static void destroy_mc(struct rdma_id_private *id_priv,
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ndev = dev_get_by_index(dev_addr->net,
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dev_addr->bound_dev_if);
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if (ndev) {
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cma_igmp_send(ndev, &mc->multicast.ib->rec.mgid, false);
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union ib_gid mgid;
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cma_set_mgid(id_priv, (struct sockaddr *)&mc->addr,
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&mgid);
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cma_igmp_send(ndev, &mgid, false);
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dev_put(ndev);
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}
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kref_put(&mc->mcref, release_mc);
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}
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kfree(mc);
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}
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static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
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@ -2664,6 +2650,8 @@ out_unlock:
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mutex_unlock(&id_priv->handler_mutex);
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cma_id_put(id_priv);
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out_free:
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if (work->event.event == RDMA_CM_EVENT_MULTICAST_JOIN)
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rdma_destroy_ah_attr(&work->event.param.ud.ah_attr);
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kfree(work);
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}
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@ -4324,53 +4312,66 @@ out:
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}
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EXPORT_SYMBOL(rdma_disconnect);
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static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
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static void cma_make_mc_event(int status, struct rdma_id_private *id_priv,
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struct ib_sa_multicast *multicast,
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struct rdma_cm_event *event,
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struct cma_multicast *mc)
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{
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struct rdma_id_private *id_priv;
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struct cma_multicast *mc = multicast->context;
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struct rdma_cm_event event = {};
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int ret = 0;
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id_priv = mc->id_priv;
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mutex_lock(&id_priv->handler_mutex);
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if (READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL ||
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READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING)
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goto out;
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struct rdma_dev_addr *dev_addr;
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enum ib_gid_type gid_type;
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struct net_device *ndev;
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if (!status)
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status = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
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else
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pr_debug_ratelimited("RDMA CM: MULTICAST_ERROR: failed to join multicast. status %d\n",
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status);
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event.status = status;
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event.param.ud.private_data = mc->context;
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if (!status) {
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struct rdma_dev_addr *dev_addr =
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&id_priv->id.route.addr.dev_addr;
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struct net_device *ndev =
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dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
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enum ib_gid_type gid_type =
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id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
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rdma_start_port(id_priv->cma_dev->device)];
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event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
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ret = ib_init_ah_from_mcmember(id_priv->id.device,
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id_priv->id.port_num,
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&multicast->rec,
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ndev, gid_type,
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&event.param.ud.ah_attr);
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if (ret)
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event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
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event->status = status;
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event->param.ud.private_data = mc->context;
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if (status) {
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event->event = RDMA_CM_EVENT_MULTICAST_ERROR;
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return;
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}
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event.param.ud.qp_num = 0xFFFFFF;
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event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
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if (ndev)
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dev_put(ndev);
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} else
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event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
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dev_addr = &id_priv->id.route.addr.dev_addr;
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ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
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gid_type =
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id_priv->cma_dev
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->default_gid_type[id_priv->id.port_num -
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rdma_start_port(
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id_priv->cma_dev->device)];
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event->event = RDMA_CM_EVENT_MULTICAST_JOIN;
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if (ib_init_ah_from_mcmember(id_priv->id.device, id_priv->id.port_num,
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&multicast->rec, ndev, gid_type,
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&event->param.ud.ah_attr)) {
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event->event = RDMA_CM_EVENT_MULTICAST_ERROR;
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goto out;
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}
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event->param.ud.qp_num = 0xFFFFFF;
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event->param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
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out:
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if (ndev)
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dev_put(ndev);
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}
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static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
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{
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struct cma_multicast *mc = multicast->context;
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struct rdma_id_private *id_priv = mc->id_priv;
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struct rdma_cm_event event = {};
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int ret = 0;
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mutex_lock(&id_priv->handler_mutex);
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if (READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL ||
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READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING)
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goto out;
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cma_make_mc_event(status, id_priv, multicast, &event, mc);
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ret = cma_cm_event_handler(id_priv, &event);
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rdma_destroy_ah_attr(&event.param.ud.ah_attr);
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if (ret) {
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destroy_id_handler_unlock(id_priv);
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@ -4460,23 +4461,10 @@ static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
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IB_SA_MCMEMBER_REC_MTU |
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IB_SA_MCMEMBER_REC_HOP_LIMIT;
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mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
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id_priv->id.port_num, &rec,
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comp_mask, GFP_KERNEL,
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cma_ib_mc_handler, mc);
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return PTR_ERR_OR_ZERO(mc->multicast.ib);
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}
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static void iboe_mcast_work_handler(struct work_struct *work)
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{
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struct iboe_mcast_work *mw = container_of(work, struct iboe_mcast_work, work);
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struct cma_multicast *mc = mw->mc;
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struct ib_sa_multicast *m = mc->multicast.ib;
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mc->multicast.ib->context = mc;
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cma_ib_mc_handler(0, m);
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kref_put(&mc->mcref, release_mc);
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kfree(mw);
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mc->sa_mc = ib_sa_join_multicast(&sa_client, id_priv->id.device,
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id_priv->id.port_num, &rec, comp_mask,
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GFP_KERNEL, cma_ib_mc_handler, mc);
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return PTR_ERR_OR_ZERO(mc->sa_mc);
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}
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static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid,
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@ -4511,52 +4499,47 @@ static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid,
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static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
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struct cma_multicast *mc)
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{
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struct iboe_mcast_work *work;
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struct cma_work *work;
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struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
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int err = 0;
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struct sockaddr *addr = (struct sockaddr *)&mc->addr;
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struct net_device *ndev = NULL;
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struct ib_sa_multicast ib;
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enum ib_gid_type gid_type;
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bool send_only;
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send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN);
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if (cma_zero_addr((struct sockaddr *)&mc->addr))
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if (cma_zero_addr(addr))
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return -EINVAL;
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work = kzalloc(sizeof *work, GFP_KERNEL);
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if (!work)
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return -ENOMEM;
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mc->multicast.ib = kzalloc(sizeof(struct ib_sa_multicast), GFP_KERNEL);
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if (!mc->multicast.ib) {
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err = -ENOMEM;
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goto out1;
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}
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gid_type = id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
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rdma_start_port(id_priv->cma_dev->device)];
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cma_iboe_set_mgid(addr, &mc->multicast.ib->rec.mgid, gid_type);
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cma_iboe_set_mgid(addr, &ib.rec.mgid, gid_type);
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mc->multicast.ib->rec.pkey = cpu_to_be16(0xffff);
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ib.rec.pkey = cpu_to_be16(0xffff);
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if (id_priv->id.ps == RDMA_PS_UDP)
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mc->multicast.ib->rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
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ib.rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
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if (dev_addr->bound_dev_if)
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ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
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if (!ndev) {
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err = -ENODEV;
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goto out2;
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goto err_free;
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}
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mc->multicast.ib->rec.rate = iboe_get_rate(ndev);
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mc->multicast.ib->rec.hop_limit = 1;
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mc->multicast.ib->rec.mtu = iboe_get_mtu(ndev->mtu);
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ib.rec.rate = iboe_get_rate(ndev);
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ib.rec.hop_limit = 1;
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ib.rec.mtu = iboe_get_mtu(ndev->mtu);
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if (addr->sa_family == AF_INET) {
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if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) {
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mc->multicast.ib->rec.hop_limit = IPV6_DEFAULT_HOPLIMIT;
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ib.rec.hop_limit = IPV6_DEFAULT_HOPLIMIT;
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if (!send_only) {
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err = cma_igmp_send(ndev, &mc->multicast.ib->rec.mgid,
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err = cma_igmp_send(ndev, &ib.rec.mgid,
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true);
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}
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}
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@ -4565,24 +4548,22 @@ static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
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err = -ENOTSUPP;
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}
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dev_put(ndev);
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if (err || !mc->multicast.ib->rec.mtu) {
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if (err || !ib.rec.mtu) {
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if (!err)
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err = -EINVAL;
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goto out2;
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goto err_free;
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}
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rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
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&mc->multicast.ib->rec.port_gid);
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&ib.rec.port_gid);
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work->id = id_priv;
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work->mc = mc;
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INIT_WORK(&work->work, iboe_mcast_work_handler);
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kref_get(&mc->mcref);
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INIT_WORK(&work->work, cma_work_handler);
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cma_make_mc_event(0, id_priv, &ib, &work->event, mc);
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/* Balances with cma_id_put() in cma_work_handler */
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cma_id_get(id_priv);
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queue_work(cma_wq, &work->work);
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return 0;
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out2:
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kfree(mc->multicast.ib);
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out1:
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err_free:
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kfree(work);
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return err;
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}
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@ -4604,7 +4585,7 @@ int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
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READ_ONCE(id_priv->state) != RDMA_CM_ADDR_RESOLVED))
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return -EINVAL;
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mc = kmalloc(sizeof *mc, GFP_KERNEL);
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mc = kzalloc(sizeof(*mc), GFP_KERNEL);
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if (!mc)
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return -ENOMEM;
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@ -4614,7 +4595,6 @@ int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
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mc->join_state = join_state;
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if (rdma_protocol_roce(id->device, id->port_num)) {
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kref_init(&mc->mcref);
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ret = cma_iboe_join_multicast(id_priv, mc);
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if (ret)
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goto out_err;
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