From: Paul Durrant <xadimgnik@gmail.com>
To: David Woodhouse <dwmw2@infradead.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Richard Henderson <richard.henderson@linaro.org>,
Eduardo Habkost <eduardo@habkost.net>,
"Michael S. Tsirkin" <mst@redhat.com>,
Marcel Apfelbaum <marcel.apfelbaum@gmail.com>,
qemu-devel <qemu-devel@nongnu.org>
Subject: Re: i386/xen: prevent guest from binding loopback event channel to itself
Date: Wed, 26 Jul 2023 09:44:00 +0100 [thread overview]
Message-ID: <e2df69f7-d7d1-a2c4-6bf0-e2142f64a53b@xen.org> (raw)
In-Reply-To: <c976d480399a44e09b1da3ad201e3021def223f7.camel@infradead.org>
On 25/07/2023 11:05, David Woodhouse wrote:
> From: David Woodhouse <dwmw@amazon.co.uk>
>
> 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>
> ---
> hw/i386/kvm/xen_evtchn.c | 11 +++++++++--
> 1 file changed, 9 insertions(+), 2 deletions(-)
>
Reviewed-by: Paul Durrant <paul@xen.org>
next prev parent reply other threads:[~2023-07-26 8:44 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-25 10:05 i386/xen: prevent guest from binding loopback event channel to itself David Woodhouse
2023-07-26 8:44 ` Paul Durrant [this message]
2023-07-26 9:07 ` David Woodhouse
2023-07-26 9:24 ` Paul Durrant
2023-07-26 17:48 ` Bernhard Beschow
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