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conn: ensure control message size is respected in StdNetBind 

This commit re-slices received control messages in StdNetBind to the
value the OS reports on a successful read. Previously, the len of this
slice would always be srcControlSize, which could result in control
message values leaking through a sync.Pool round trip. This is
unlikely with the IP_PKTINFO socket option set successfully, but
should be guarded against.

Reviewed-by: James Tucker <james@tailscale.com>
Signed-off-by: Jordan Whited <jordan@tailscale.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jordan Whited 2023-03-09 10:46:12 -08:00 committed by Jason A. Donenfeld
parent 2fcdaf9799
commit 6901984f6a
1 changed files with 2 additions and 2 deletions
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4
conn/bind_std.go
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@ -229,7 +229,7 @@ func (s *StdNetBind) makeReceiveIPv4(pc *ipv4.PacketConn, conn *net.UDPConn) Rec
sizes[i] = msg.N
addrPort := msg.Addr.(*net.UDPAddr).AddrPort()
ep := asEndpoint(addrPort)
getSrcFromControl(msg.OOB, ep)
getSrcFromControl(msg.OOB[:msg.NN], ep)
eps[i] = ep
}
return numMsgs, nil
@ -262,7 +262,7 @@ func (s *StdNetBind) makeReceiveIPv6(pc *ipv6.PacketConn, conn *net.UDPConn) Rec
sizes[i] = msg.N
addrPort := msg.Addr.(*net.UDPAddr).AddrPort()
ep := asEndpoint(addrPort)
getSrcFromControl(msg.OOB, ep)
getSrcFromControl(msg.OOB[:msg.NN], ep)
eps[i] = ep
}
return numMsgs, nil