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From: Paul Brook <paul@codesourcery.com>
To: qemu-devel@nongnu.org
Cc: amit.shah@redhat.com, quintela@redhat.com, kraxel@redhat.com,
	"Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support
Date: Sun, 28 Feb 2010 01:59:27 +0000	[thread overview]
Message-ID: <201002280159.27231.paul@codesourcery.com> (raw)
In-Reply-To: <20100227193824.GA26389@redhat.com>

> > I'm pretty sure a guest can cause those to change and I'm not 100%
> > sure,   but I think it's a potential source of exploits if you assume a
> > mapping. In the very least, a guest can trick vhost into writing to ram
> > that it wouldn't normally write to.
> 
> This seems harmless. guest can write anywhere in ram, anyway.

Surely writing to the wrong address is always a fatal flaw.  There certainly 
exist machines that can change physical RAM mapping.  While I wouldn't expect 
this to happen during normal operation, it could occur between a (virtio-
aware) bootloader/BIOS and real kernel.

Paul

  reply	other threads:[~2010-02-28  1:59 UTC|newest]

Thread overview: 70+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-02-25 18:27 [Qemu-devel] [PATCHv2 00/12] vhost-net: upstream integration Michael S. Tsirkin
2010-02-25 18:27 ` [Qemu-devel] [PATCHv2 05/12] virtio: add APIs for queue fields Michael S. Tsirkin
2010-02-25 18:49   ` Blue Swirl
2010-02-26 14:53     ` Michael S. Tsirkin
2010-02-25 19:25   ` [Qemu-devel] " Anthony Liguori
2010-02-26  8:46     ` Gleb Natapov
2010-02-25 18:28 ` [Qemu-devel] [PATCHv2 09/12] vhost: vhost net support Michael S. Tsirkin
2010-02-25 19:04   ` [Qemu-devel] " Juan Quintela
2010-02-26 14:32     ` Michael S. Tsirkin
2010-02-26 14:38       ` Anthony Liguori
2010-02-26 14:54         ` Michael S. Tsirkin
2010-02-25 19:44   ` Anthony Liguori
2010-02-26 14:49     ` Michael S. Tsirkin
2010-02-26 15:18       ` Anthony Liguori
2010-02-27 19:38         ` Michael S. Tsirkin
2010-02-28  1:59           ` Paul Brook [this message]
2010-02-28 10:15             ` Michael S. Tsirkin
2010-02-28 12:45               ` Paul Brook
2010-02-28 14:44                 ` Michael S. Tsirkin
2010-02-28 15:23                   ` Paul Brook
2010-02-28 15:37                     ` Michael S. Tsirkin
2010-02-28 16:02           ` Anthony Liguori
2010-02-25 18:28 ` [Qemu-devel] [PATCHv2 02/12] kvm: add API to set ioeventfd Michael S. Tsirkin
2010-02-25 19:19   ` [Qemu-devel] " Anthony Liguori
2010-03-02 17:41     ` Michael S. Tsirkin
2010-02-25 18:28 ` [Qemu-devel] [PATCHv2 04/12] virtio: add notifier support Michael S. Tsirkin
2010-02-25 18:28 ` [Qemu-devel] [PATCHv2 01/12] tap: add interface to get device fd Michael S. Tsirkin
2010-02-25 18:28 ` [Qemu-devel] [PATCHv2 07/12] virtio: move typedef to qemu-common Michael S. Tsirkin
2010-02-25 18:28 ` [Qemu-devel] [PATCHv2 10/12] tap: add vhost/vhostfd options Michael S. Tsirkin
2010-02-25 19:47   ` [Qemu-devel] " Anthony Liguori
2010-02-26 14:51     ` Michael S. Tsirkin
2010-02-26 15:23       ` Anthony Liguori
2010-02-27 19:44         ` Michael S. Tsirkin
2010-02-28 16:08           ` Anthony Liguori
2010-02-28 17:19             ` Michael S. Tsirkin
2010-02-28 20:57               ` Anthony Liguori
2010-02-28 21:01                 ` Michael S. Tsirkin
2010-02-28 22:38                   ` Anthony Liguori
2010-02-28 22:39                 ` Paul Brook
2010-03-01 19:27                   ` Michael S. Tsirkin
2010-03-01 21:54                     ` Anthony Liguori
2010-03-02  9:57                       ` Michael S. Tsirkin
2010-03-02 14:07                   ` Anthony Liguori
2010-03-02 14:33                     ` Paul Brook
2010-03-02 14:39                       ` Anthony Liguori
2010-03-02 14:55                         ` Paul Brook
2010-03-02 15:33                           ` Anthony Liguori
2010-03-02 15:53                             ` Paul Brook
2010-03-02 15:56                               ` Michael S. Tsirkin
2010-03-02 16:12                               ` Anthony Liguori
2010-03-02 16:21                                 ` Marcelo Tosatti
2010-03-02 16:12                 ` Marcelo Tosatti
2010-03-02 16:56                   ` Anthony Liguori
2010-03-02 17:00                     ` Michael S. Tsirkin
2010-03-02 18:00                     ` Marcelo Tosatti
2010-03-02 18:13                       ` Anthony Liguori
2010-03-02 22:41                     ` Paul Brook
2010-03-03 14:15                       ` Anthony Liguori
2010-03-03 14:43                         ` Paul Brook
2010-03-03 16:24                         ` Marcelo Tosatti
2010-02-25 18:28 ` [Qemu-devel] [PATCHv2 11/12] tap: add API to retrieve vhost net header Michael S. Tsirkin
2010-02-25 18:28 ` [Qemu-devel] [PATCHv2 06/12] virtio: add set_status callback Michael S. Tsirkin
2010-02-25 18:28 ` [Qemu-devel] [PATCHv2 08/12] virtio-pci: fill in notifier support Michael S. Tsirkin
2010-02-25 19:30   ` [Qemu-devel] " Anthony Liguori
2010-02-28 20:02     ` Michael S. Tsirkin
2010-02-25 18:28 ` [Qemu-devel] [PATCHv2 03/12] notifier: event notifier implementation Michael S. Tsirkin
2010-02-25 19:22   ` [Qemu-devel] " Anthony Liguori
2010-02-28 19:59     ` Michael S. Tsirkin
2010-02-25 18:28 ` [Qemu-devel] [PATCHv2 12/12] virtio-net: vhost net support Michael S. Tsirkin
2010-02-25 19:49 ` [Qemu-devel] Re: [PATCHv2 00/12] vhost-net: upstream integration Anthony Liguori

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