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CVE-2017-1000
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Date: February 22, 2023
udp: consistently apply ufo or fragmentation commit 85f1bd9a7b5a79d5baa8bf44af19658f7bf77bfa upstream. When iteratively building a UDP datagram with MSG_MORE and that datagram exceeds MTU, consistently choose UFO or fragmentation. Once skb_is_gso, always apply ufo. Conversely, once a datagram is split across multiple skbs, do not consider ufo. Sendpage already maintains the first invariant, only add the second. IPv6 does not have a sendpage implementation to modify. A gso skb must have a partial checksum, do not follow sk_no_check_tx in udp_send_skb. Found by syzkaller. [gregkh - tweaks for 3.18 for ipv6, hopefully they are correct...] [wt: s/skb_is_gso/skb_has_frags for 3.10] Fixes: e89e9cf539a2 ("[IPv4/IPv6]: UFO Scatter-gather approach") Reported-by: Andrey Konovalov <andreyknvl@google.com> Bug: 68806309 Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Willy Tarreau <w@1wt.eu> Change-Id: Iac75f1be3304c7400e1c5d221a56476a0d60aba3 Signed-off-by: Suren Baghdasaryan <6c9ae9a1a5f38d4caff88933ca76ff7fe5ebb0f0@google.com> CVE-2017-1000 Signed-off-by: Kevin F. Haggerty <b3d43acdf68f60566d4deeada3d54faa7e5e7dcc@lineageos.org> (cherry picked from commit 676b0bd25db8416823977e2d00a382dad07d460d)
Language: C
Severity Score
Related Resources (5)
Severity Score
Top Fix
CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | LOCAL |
| Attack Complexity (AC): | HIGH |
| Privileges Required (PR): | LOW |
| User Interaction (UI): | NONE |
| Scope (S): | UNCHANGED |
| Confidentiality (C): | HIGH |
| Integrity (I): | HIGH |
| Availability (A): | HIGH |