RDMA/nldev: Check CAP_NET_RAW in user namespace for QP modify

Currently, the capability check is done in the default
init_user_ns user namespace. When a process runs in a
non default user namespace, such check fails. Due to this
when a process is running using Podman, it fails to modify
the QP.

Since the RDMA device is a resource within a network namespace,
use the network namespace associated with the RDMA device to
determine its owning user namespace.

Fixes: 0cadb4db79e1 ("RDMA/uverbs: Restrict usage of privileged QKEYs")
Signed-off-by: Parav Pandit <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Leon Romanovsky <[e-mail]>

drivers/infiniband/core/nldev.c

···
 
 bool rdma_nl_get_privileged_qkey(void)
 {
-	return privileged_qkey || capable(CAP_NET_RAW);
+	return privileged_qkey;
 }
 EXPORT_SYMBOL(rdma_nl_get_privileged_qkey);
 

drivers/infiniband/core/uverbs_cmd.c

···
 		attr->path_mig_state = cmd->base.path_mig_state;
 	if (cmd->base.attr_mask & IB_QP_QKEY) {
 		if (cmd->base.qkey & IB_QP_SET_QKEY &&
-		    !rdma_nl_get_privileged_qkey()) {
+		    !(rdma_nl_get_privileged_qkey() ||
+		      rdma_uattrs_has_raw_cap(attrs))) {
 			ret = -EPERM;
 			goto release_qp;
 		}