A recent flurry of bug fixes for dealing with kernel crashes around
eth_type_trans() showed up on the list. The earliest attempt to fix
this came from Ren Wei <[email protected]>. There are many others
(but i lost track of them). Ren Wei's latest attempt hit a roadblock
with a NACK from Eric[1] asking to fix at the "producers"
These producers can hand a packet to a shared consumer with less than a
full Ethernet header in the linear area.
This series identifies and fixes the following producers:
1. act_vlan POP_ETH rejects a short linear Ethernet header at the tc
action boundary.
2. act_mpls POP does the same, standalone or chained after POP_ETH.
3. tun keeps the no-offload copy hint safe (raising a short hint instead
of rejecting a valid write) while guaranteeing a linear Ethernet
header for the redirected consumer.
4. OVS pop_mpls(ETH_P_TEB) pulls the inner Ethernet header before
restoring MAC_PROTO_ETHERNET.
5. OVS pop_nsh(TUN_P_ETHERNET) does the same for the NSH producer.
1:
https://lore.kernel.org/netdev/[email protected]/
Signed-off-by: Jamal Hadi Salim <[email protected]>
Jamal Hadi Salim (5):
net/sched: act_vlan: reject short linear Ethernet headers after POP_ETH
net/sched: act_mpls: reject short linear Ethernet headers after pop
net: tun: keep TUN short linear copy hints safe
net: openvswitch: ensure a linear inner Ethernet header on TEB pop
net: openvswitch: ensure a linear inner Ethernet header on NSH pop
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