From: Amit Shah <amit.shah@redhat.com>
To: Paul Brook <paul@codesourcery.com>
Cc: qemu list <qemu-devel@nongnu.org>
Subject: [Qemu-devel] Re: [PATCH 5/5] virtio-serial: Error out if guest sends unexpected vq elements
Date: Fri, 10 Dec 2010 20:29:07 +0530 [thread overview]
Message-ID: <20101210145906.GC15015@amit-x200.redhat.com> (raw)
In-Reply-To: <201012101359.50252.paul@codesourcery.com>
On (Fri) Dec 10 2010 [13:59:50], Paul Brook wrote:
> > Check if the guest really sent any items in the out_vq before using
> > them. Similarly, check if there is a buffer to send data in before
> > writing.
>
> Can this actually happen? If so why/how?
> Why does it need a special case in this device?
A malicious guest (ie, a guest with the virtio_console module suitably
modified) could send in buffers with the 'input' bit set instead of
output as expected or vice-versa.
> If this is guest triggerable then calling abort() is wrong.
It's either a guest bug or a malicious guest. What action is
recommended?
Amit
next prev parent reply other threads:[~2010-12-10 14:59 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-10 13:25 [Qemu-devel] [PATCH 0/5] virtio-serial: Trivial fixes, don't copy buffers to host Amit Shah
2010-12-10 13:25 ` [Qemu-devel] [PATCH 1/5] virtio-console: Factor out common init between console and generic ports Amit Shah
2010-12-10 13:25 ` [Qemu-devel] [PATCH 2/5] virtio-console: Remove unnecessary braces Amit Shah
2010-12-10 13:25 ` [Qemu-devel] [PATCH 3/5] virtio-serial: Simplify condition for a while loop Amit Shah
2010-12-10 13:25 ` [Qemu-devel] [PATCH 4/5] virtio-serial: Don't copy over guest buffer to host Amit Shah
2010-12-10 14:02 ` [Qemu-devel] " Paul Brook
2010-12-10 14:59 ` Amit Shah
2010-12-10 15:17 ` Paul Brook
2010-12-10 15:26 ` Amit Shah
2010-12-10 13:25 ` [Qemu-devel] [PATCH 5/5] virtio-serial: Error out if guest sends unexpected vq elements Amit Shah
2010-12-10 13:59 ` [Qemu-devel] " Paul Brook
2010-12-10 14:59 ` Amit Shah [this message]
2010-12-10 15:17 ` Paul Brook
2010-12-10 15:30 ` Amit Shah
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