Entreprise française de cybersécurité depuis 2004
☎ 03 60 47 09 81 - info@securiteinfo.com
☎ 03 60 47 09 81 - info@securiteinfo.com
In the Linux kernel, the following vulnerability has been resolved:net: gso: fix ownership in __udp_gso_segmentIn __udp_gso_segment the skb destructor is removed before segmenting theskb but the socket reference is kept as-is. This is an issue if theoriginal skb is later orphaned as we can hit the following bug: kernel BUG at ./include/linux/skbuff.h:3312! (skb_orphan) RIP: 0010:ip_rcv_core+0x8b2/0xca0 Call Trace: ip_rcv+0xab/0x6e0 __netif_receive_skb_one_core+0x168/0x1b0 process_backlog+0x384/0x1100 __napi_poll.constprop.0+0xa1/0x370 net_rx_action+0x925/0xe50The above can happen following a sequence of events when usingOpenVSwitch, when an OVS_ACTION_ATTR_USERSPACE action precedes anOVS_ACTION_ATTR_OUTPUT action:1. OVS_ACTION_ATTR_USERSPACE is handled (in do_execute_actions): the skb goes through queue_gso_packets and then __udp_gso_segment, where its destructor is removed.2. The segments' data are copied and sent to userspace.3. OVS_ACTION_ATTR_OUTPUT is handled (in do_execute_actions) and the same original skb is sent to its path.4. If it later hits skb_orphan, we hit the bug.Fix this by also removing the reference to the socket in__udp_gso_segment.
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