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authorJason Gunthorpe <jgg@mellanox.com>2019-02-12 21:12:56 -0700
committerJason Gunthorpe <jgg@mellanox.com>2019-02-19 20:52:18 -0700
commitca22354b140853b8155692d5b2bc0110aa54e937 (patch)
tree6265175dff59f674ecd82e69536f4e9a0b89f4a4 /drivers/infiniband/sw/rxe
parentRDMA/rxe: Add ib_device_get_by_name() and use it in rxe (diff)
downloadlinux-dev-ca22354b140853b8155692d5b2bc0110aa54e937.tar.xz
linux-dev-ca22354b140853b8155692d5b2bc0110aa54e937.zip
RDMA/rxe: Close a race after ib_register_device
Since rxe allows unregistration from other threads the rxe pointer can become invalid any moment after ib_register_driver returns. This could cause a user triggered use after free. Add another driver callback to be called right after the device becomes registered to complete any device setup required post-registration. This callback has enough core locking to prevent the device from becoming unregistered. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'drivers/infiniband/sw/rxe')
-rw-r--r--drivers/infiniband/sw/rxe/rxe_net.c8
-rw-r--r--drivers/infiniband/sw/rxe/rxe_net.h2
-rw-r--r--drivers/infiniband/sw/rxe/rxe_sysfs.c9
-rw-r--r--drivers/infiniband/sw/rxe/rxe_verbs.c14
4 files changed, 21 insertions, 12 deletions
diff --git a/drivers/infiniband/sw/rxe/rxe_net.c b/drivers/infiniband/sw/rxe/rxe_net.c
index d6dfbcf6a47e..fb792f5bc0b7 100644
--- a/drivers/infiniband/sw/rxe/rxe_net.c
+++ b/drivers/infiniband/sw/rxe/rxe_net.c
@@ -517,24 +517,24 @@ enum rdma_link_layer rxe_link_layer(struct rxe_dev *rxe, unsigned int port_num)
return IB_LINK_LAYER_ETHERNET;
}
-struct rxe_dev *rxe_net_add(struct net_device *ndev)
+int rxe_net_add(struct net_device *ndev)
{
int err;
struct rxe_dev *rxe = NULL;
rxe = ib_alloc_device(rxe_dev, ib_dev);
if (!rxe)
- return NULL;
+ return -ENOMEM;
rxe->ndev = ndev;
err = rxe_add(rxe, ndev->mtu);
if (err) {
ib_dealloc_device(&rxe->ib_dev);
- return NULL;
+ return err;
}
- return rxe;
+ return 0;
}
static void rxe_port_event(struct rxe_dev *rxe,
diff --git a/drivers/infiniband/sw/rxe/rxe_net.h b/drivers/infiniband/sw/rxe/rxe_net.h
index 106c586dbb26..ad79514191bb 100644
--- a/drivers/infiniband/sw/rxe/rxe_net.h
+++ b/drivers/infiniband/sw/rxe/rxe_net.h
@@ -43,7 +43,7 @@ struct rxe_recv_sockets {
struct socket *sk6;
};
-struct rxe_dev *rxe_net_add(struct net_device *ndev);
+int rxe_net_add(struct net_device *ndev);
int rxe_net_init(void);
void rxe_net_exit(void);
diff --git a/drivers/infiniband/sw/rxe/rxe_sysfs.c b/drivers/infiniband/sw/rxe/rxe_sysfs.c
index d51b55b0a311..46587eb0da0e 100644
--- a/drivers/infiniband/sw/rxe/rxe_sysfs.c
+++ b/drivers/infiniband/sw/rxe/rxe_sysfs.c
@@ -60,7 +60,6 @@ static int rxe_param_set_add(const char *val, const struct kernel_param *kp)
char intf[32];
struct net_device *ndev;
struct rxe_dev *exists;
- struct rxe_dev *rxe;
len = sanitize_arg(val, intf, sizeof(intf));
if (!len) {
@@ -82,16 +81,12 @@ static int rxe_param_set_add(const char *val, const struct kernel_param *kp)
goto err;
}
- rxe = rxe_net_add(ndev);
- if (!rxe) {
+ err = rxe_net_add(ndev);
+ if (err) {
pr_err("failed to add %s\n", intf);
- err = -EINVAL;
goto err;
}
- rxe_set_port_state(rxe);
- dev_info(&rxe->ib_dev.dev, "added %s\n", intf);
-
err:
dev_put(ndev);
return err;
diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.c b/drivers/infiniband/sw/rxe/rxe_verbs.c
index 76da8a142bf7..79ad93b4140c 100644
--- a/drivers/infiniband/sw/rxe/rxe_verbs.c
+++ b/drivers/infiniband/sw/rxe/rxe_verbs.c
@@ -1125,6 +1125,15 @@ static const struct attribute_group rxe_attr_group = {
.attrs = rxe_dev_attributes,
};
+static int rxe_enable_driver(struct ib_device *ib_dev)
+{
+ struct rxe_dev *rxe = container_of(ib_dev, struct rxe_dev, ib_dev);
+
+ rxe_set_port_state(rxe);
+ dev_info(&rxe->ib_dev.dev, "added %s\n", netdev_name(rxe->ndev));
+ return 0;
+}
+
static const struct ib_device_ops rxe_dev_ops = {
.alloc_hw_stats = rxe_ib_alloc_hw_stats,
.alloc_mr = rxe_alloc_mr,
@@ -1144,6 +1153,7 @@ static const struct ib_device_ops rxe_dev_ops = {
.destroy_qp = rxe_destroy_qp,
.destroy_srq = rxe_destroy_srq,
.detach_mcast = rxe_detach_mcast,
+ .enable_driver = rxe_enable_driver,
.get_dma_mr = rxe_get_dma_mr,
.get_hw_stats = rxe_ib_get_hw_stats,
.get_link_layer = rxe_get_link_layer,
@@ -1245,5 +1255,9 @@ int rxe_register_device(struct rxe_dev *rxe)
if (err)
pr_warn("%s failed with error %d\n", __func__, err);
+ /*
+ * Note that rxe may be invalid at this point if another thread
+ * unregistered it.
+ */
return err;
}