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Kernel: Remove socket from the listener's accept list when it is closed

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Without this patch we end up with sockets in the listener's accept
queue with state 'closed' when doing stealth SYN scans:

Client -> Server: SYN for port 22
Server -> Client: SYN/ACK
Client -> Server: RST (i.e. don't complete the TCP handshake)
This commit is contained in:
Gunnar Beutner 2021-04-30 21:43:37 +02:00 committed by Andreas Kling
parent 866e577f1d
commit fb2ad94195
Notes: sideshowbarker 2024-07-18 18:51:18 +09:00 
Author: https://github.com/gunnarbeutner
Commit: https://github.com/SerenityOS/serenity/commit/fb2ad941958
Pull-request: https://github.com/SerenityOS/serenity/pull/6762
1 changed files with 4 additions and 0 deletions
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4
Kernel/Net/TCPSocket.cpp
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@ -40,6 +40,9 @@ void TCPSocket::set_state(State new_state)
if (new_state == State::Closed) {
Locker locker(closing_sockets().lock());
closing_sockets().resource().remove(tuple());
if (m_originator)
release_to_originator();
}
if (previous_role != m_role || was_disconnected != protocol_is_disconnected())
@ -114,6 +117,7 @@ void TCPSocket::release_to_originator()
{
VERIFY(!!m_originator);
m_originator.strong_ref()->release_for_accept(this);
m_originator.clear();
}
void TCPSocket::release_for_accept(RefPtr<TCPSocket> socket)