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/openbmc/linux/net/kcm/ |
H A D | kcmsock.c | 351050ec Wed Aug 30 11:29:31 CDT 2017 Eric Dumazet <edumazet@google.com> kcm: do not attach PF_KCM sockets to avoid deadlock
syzkaller had no problem to trigger a deadlock, attaching a KCM socket to another one (or itself). (original syzkaller report was a very confusing lockdep splat during a sendmsg())
It seems KCM claims to only support TCP, but no enforcement is done, so we might need to add additional checks.
Fixes: ab7ac4eb9832 ("kcm: Kernel Connection Multiplexor module") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Dmitry Vyukov <dvyukov@google.com> Acked-by: Tom Herbert <tom@quantonium.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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