[net,0/2] net: openvswitch: limit the recursions from action sets

Message

Aaron Conole Feb. 6, 2024, 1:11 p.m. UTC

Open vSwitch module accepts actions as a list from the netlink socket
and then creates a copy which it uses in the action set processing.
During processing of the action list on a packet, the module keeps a
count of the execution depth and exits processing if the action depth
goes too high.

However, during netlink processing the recursion depth isn't checked
anywhere, and the copy trusts that kernel has large enough stack to
accommodate it.  The OVS sample action was the original action which
could perform this kinds of recursion, and it originally checked that
it didn't exceed the sample depth limit.  However, when sample became
optimized to provide the clone() semantics, the recursion limit was
dropped.

This series adds a depth limit during the __ovs_nla_copy_actions() call
that will ensure we don't exceed the max that the OVS userspace could
generate for a clone().

Additionally, this series provides a selftest in 2/2 that can be used to
determine if the OVS module is allowing unbounded access.  It can be
safely omitted where the ovs selftest framework isn't available.

Aaron Conole (2):
  net: openvswitch: limit the number of recursions from action sets
  selftests: openvswitch: Add validation for the recursion test

 net/openvswitch/flow_netlink.c                | 33 +++++++--
 .../selftests/net/openvswitch/openvswitch.sh  | 13 ++++
 .../selftests/net/openvswitch/ovs-dpctl.py    | 71 +++++++++++++++----
 3 files changed, 97 insertions(+), 20 deletions(-)