[PATCH net 0/3] net/sched: teql: Enforce hierarchy placement

[Jamal Hadi Salim <jhs@mojatatu.com>]

GangMin Kim <km.kim1503@gmail.com> managed to create a UAF on qfq by inserting
teql as a child qdisc and exploiting a qlen sync issue.
teql is not intended to be used as a child qdisc. Lets enforce that rule in
patch #1. Although patch #1 fixes the issue, we prevent another potential qlen
exploit in qfq in patch #2 by enforcing the child's active status is not
determined by inspecting the qlen. In patch #3 we add a tdc test case.


Jamal Hadi Salim (2):
  net/sched: Enforce that teql can only be used as root qdisc
  net/sched: qfq: Use cl_is_active to determine whether  class is active
    in qfq_rm_from_ag

Victor Nogueira (1):
  selftests/tc-testing: Try to add teql as a child qdisc

 net/sched/sch_qfq.c                           |  2 +-
 net/sched/sch_teql.c                          |  5 ++++
 .../tc-testing/tc-tests/qdiscs/teql.json      | 25 +++++++++++++++++++
 3 files changed, 31 insertions(+), 1 deletion(-)

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2.34.1