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Re: [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support
From: |
Paul Brook |
Subject: |
Re: [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support |
Date: |
Sun, 28 Feb 2010 01:59:27 +0000 |
User-agent: |
KMail/1.12.4 (Linux/2.6.32-trunk-amd64; KDE/4.3.4; x86_64; ; ) |
> > 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
- Re: [Qemu-devel] Re: [PATCHv2 05/12] virtio: add APIs for queue fields, (continued)
- [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support, Anthony Liguori, 2010/02/25
- [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support, Michael S. Tsirkin, 2010/02/26
- [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support, Anthony Liguori, 2010/02/26
- [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support, Michael S. Tsirkin, 2010/02/27
- Re: [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support,
Paul Brook <=
- Re: [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support, Michael S. Tsirkin, 2010/02/28
- Re: [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support, Paul Brook, 2010/02/28
- Re: [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support, Michael S. Tsirkin, 2010/02/28
- Re: [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support, Paul Brook, 2010/02/28
- Re: [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support, Michael S. Tsirkin, 2010/02/28
- [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support, Anthony Liguori, 2010/02/28
[Qemu-devel] [PATCHv2 02/12] kvm: add API to set ioeventfd, Michael S. Tsirkin, 2010/02/25
[Qemu-devel] [PATCHv2 04/12] virtio: add notifier support, Michael S. Tsirkin, 2010/02/25
[Qemu-devel] [PATCHv2 01/12] tap: add interface to get device fd, Michael S. Tsirkin, 2010/02/25