From: Avi Kivity <avi@redhat.com>
To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: kvm-devel <kvm@vger.kernel.org>
Subject: Re: [PATCH v2] KVM: x86: Disallow hypercalls for guest callers in rings > 0
Date: Tue, 04 Aug 2009 15:00:57 +0300 [thread overview]
Message-ID: <4A7822F9.7030706@redhat.com> (raw)
In-Reply-To: <4A7713B0.8080803@siemens.com>
On 08/03/2009 07:43 PM, Jan Kiszka wrote:
>
> Yes, that's much nicer.
>
> --------->
>
> So far unprivileged guest callers running in ring 3 can issue, e.g., MMU
> hypercalls. Normally, such callers cannot provide any hand-crafted MMU
> command structure as it has to be passed by its physical address, but
> they can still crash the guest kernel by passing random addresses.
>
> To close the hole, this patch considers hypercalls valid only if issued
> from guest ring 0. This may still be relaxed on a per-hypercall base in
> the future once required.
>
> Changes v1 -> v2:
> - use kvm_x86_ops->get_cpl() in favor of kvm_get_segment()
>
>
Applied, thanks.
--
error compiling committee.c: too many arguments to function
prev parent reply other threads:[~2009-08-04 11:55 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-03 13:47 [PATCH] KVM: x86: Disallow hypercalls for guest callers in rings > 0 Jan Kiszka
2009-08-03 14:04 ` Anthony Liguori
2009-08-03 14:24 ` Avi Kivity
2009-08-03 15:04 ` Anthony Liguori
2009-08-03 16:01 ` Avi Kivity
2009-08-03 14:27 ` Avi Kivity
2009-08-03 16:43 ` [PATCH v2] " Jan Kiszka
2009-08-04 12:00 ` Avi Kivity [this message]
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