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Description: net/packet: fix overflow in tpacket_rcv
References:
https://www.openwall.com/lists/oss-security/2020/09/03/3
https://lore.kernel.org/netdev/CAM6JnLf_8nwzq+UGO+amXpeApCDarJjwzOEHQd5qBhU7YKm3DQ@mail.gmail.com/
Notes:
carnil> To create AF_PACKET sockets one needs CAP_NET_RAW in the
carnil> network namepsace, which could be aquired by unprivileged
carnil> processes on systems where unprivileged namespaces are enabled.
carnil> Debian does not enable those.
Bugs:
upstream: needed
4.19-upstream-stable: needed
4.9-upstream-stable: needed
sid: needed
4.19-buster-security: needed
4.9-stretch-security: needed
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