tree 9c32705683936eb76605928a8b1e7121a3cf4605
parent 19c417ec87a446ffd1a13eeec23226fe30f31b7e
author David Woodhouse <dwmw@amazon.co.uk> 1690279500 +0200
committer Philippe Mathieu-Daudé <philmd@linaro.org> 1690926743 +0200

hw/xen: prevent guest from binding loopback event channel to itself

Fuzzing showed that a guest could bind an interdomain port to itself, by
guessing the next port to be allocated and putting that as the 'remote'
port number. By chance, that works because the newly-allocated port has
type EVTCHNSTAT_unbound. It shouldn't.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
Message-Id: <20230801175747.145906-4-dwmw2@infradead.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>