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From: "Michael S. Tsirkin" <mst@redhat.com>
To: Avi Kivity <avi@scylladb.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] Having troubles binding an SR-IOV VF to uio_pci_generic on Amazon instance
Date: Wed, 30 Sep 2015 23:40:16 +0300	[thread overview]
Message-ID: <20150930204016.GA29975@redhat.com> (raw)
In-Reply-To: <560C0171.7080507@scylladb.com>

On Wed, Sep 30, 2015 at 06:36:17PM +0300, Avi Kivity wrote:
> As it happens, you're removing the functionality from the users who have no
> other option.  They can't use vfio because it doesn't work on virtualized
> setups.

...

> Root can already do anything.

I think there's a contradiction between the two claims above.

>  So what security issue is there?

A buggy userspace can and will corrupt kernel memory.

...

> And for what, to prevent
> root from touching memory via dma that they can access in a million other
> ways?

So one can be reasonably sure a kernel oops is not a result of a
userspace bug.

-- 
MST

  reply	other threads:[~2015-09-30 20:40 UTC|newest]

Thread overview: 100+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-09-27  7:05 Vlad Zolotarov
2015-09-27  9:43 ` Michael S. Tsirkin
2015-09-27 10:50   ` Vladislav Zolotarov
2015-09-29 16:41   ` Vlad Zolotarov
2015-09-29 20:54     ` Michael S. Tsirkin
2015-09-29 21:46       ` Stephen Hemminger
2015-09-29 21:49         ` Michael S. Tsirkin
2015-09-30 10:37           ` Vlad Zolotarov
2015-09-30 10:58             ` Michael S. Tsirkin
2015-09-30 11:26               ` Vlad Zolotarov
     [not found]                 ` <20150930143927-mutt-send-email-mst@redhat.com>
2015-09-30 11:53                   ` Vlad Zolotarov
2015-09-30 12:03                     ` Michael S. Tsirkin
2015-09-30 12:16                       ` Vlad Zolotarov
2015-09-30 12:27                         ` Michael S. Tsirkin
2015-09-30 12:50                           ` Vlad Zolotarov
2015-09-30 15:26                             ` Michael S. Tsirkin
2015-09-30 18:15                               ` Vlad Zolotarov
2015-09-30 18:55                                 ` Michael S. Tsirkin
2015-09-30 19:06                                   ` Vlad Zolotarov
2015-09-30 19:10                                     ` Vlad Zolotarov
2015-09-30 19:11                                       ` Vlad Zolotarov
2015-09-30 19:39                                     ` Michael S. Tsirkin
2015-09-30 20:09                                       ` Vlad Zolotarov
2015-09-30 21:36                                         ` Stephen Hemminger
2015-09-30 21:53                                           ` Michael S. Tsirkin
2015-09-30 22:20                                           ` Vlad Zolotarov
2015-10-01  8:00                                           ` Vlad Zolotarov
2015-10-01 14:47                                             ` Stephen Hemminger
2015-10-01 15:03                                               ` Vlad Zolotarov
2015-09-30 13:05                           ` Avi Kivity
2015-09-30 14:39                             ` Michael S. Tsirkin
2015-09-30 14:53                               ` Avi Kivity
2015-09-30 15:21                                 ` Michael S. Tsirkin
2015-09-30 15:36                                   ` Avi Kivity
2015-09-30 20:40                                     ` Michael S. Tsirkin [this message]
2015-09-30 21:00                                       ` Avi Kivity
2015-10-01  8:44                                       ` Michael S. Tsirkin
2015-10-01  8:46                                         ` Vlad Zolotarov
2015-10-01  8:52                                         ` Avi Kivity
2015-10-01  9:15                                           ` Michael S. Tsirkin
2015-10-01  9:22                                             ` Avi Kivity
2015-10-01  9:42                                               ` Michael S. Tsirkin
2015-10-01  9:53                                                 ` Avi Kivity
2015-10-01 10:17                                                   ` Michael S. Tsirkin
2015-10-01 10:24                                                     ` Avi Kivity
2015-10-01 10:25                                                       ` Avi Kivity
2015-10-01 10:44                                                         ` Michael S. Tsirkin
2015-10-01 10:55                                                           ` Avi Kivity
2015-10-01 21:17                                                 ` Alexander Duyck
2015-10-02 13:50                                                   ` Michael S. Tsirkin
2015-10-01  9:42                                               ` Vincent JARDIN
2015-10-01  9:43                                                 ` Avi Kivity
2015-10-01  9:48                                                   ` Vincent JARDIN
2015-10-01  9:54                                                     ` Avi Kivity
2015-10-01 10:14                                                   ` Michael S. Tsirkin
2015-10-01 10:23                                                     ` Avi Kivity
2015-10-01 14:55                                                     ` Stephen Hemminger
2015-10-01 15:49                                                       ` Michael S. Tsirkin
2015-10-01 14:54                                                 ` Stephen Hemminger
2015-10-01  9:55                                               ` Michael S. Tsirkin
2015-10-01  9:59                                                 ` Avi Kivity
2015-10-01 10:38                                                   ` Michael S. Tsirkin
2015-10-01 10:50                                                     ` Avi Kivity
2015-10-01 11:09                                                       ` Michael S. Tsirkin
2015-10-01 11:20                                                         ` Avi Kivity
2015-10-01 11:27                                                           ` Michael S. Tsirkin
2015-10-01 11:32                                                             ` Avi Kivity
2015-10-01 15:01                                                               ` Stephen Hemminger
2015-10-01 15:08                                                                 ` Avi Kivity
2015-10-01 15:46                                                                 ` Michael S. Tsirkin
2015-10-01 15:11                                                               ` Michael S. Tsirkin
2015-10-01 15:19                                                                 ` Avi Kivity
2015-10-01 15:40                                                                   ` Michael S. Tsirkin
2015-10-01 11:31                                                           ` Michael S. Tsirkin
2015-10-01 11:34                                                             ` Avi Kivity
2015-10-01 11:08                                                     ` Bruce Richardson
2015-10-01 11:23                                                       ` Michael S. Tsirkin
2015-10-01 12:07                                                         ` Bruce Richardson
2015-10-01 13:14                                                           ` Michael S. Tsirkin
2015-10-01 16:04                                                             ` Michael S. Tsirkin
2015-10-01 21:02                                                             ` Alexander Duyck
2015-10-02 14:00                                                               ` Michael S. Tsirkin
2015-10-02 14:07                                                                 ` Bruce Richardson
2015-10-04  9:07                                                                   ` Michael S. Tsirkin
2015-10-02 15:56                                                                 ` Gleb Natapov
2015-10-02 16:57                                                                 ` Alexander Duyck
2015-10-01  9:15                                           ` Avi Kivity
2015-10-01  9:29                                             ` Michael S. Tsirkin
2015-10-01  9:38                                               ` Avi Kivity
2015-10-01 10:07                                                 ` Michael S. Tsirkin
2015-10-01 10:11                                                   ` Avi Kivity
2015-10-01  9:16                                         ` Michael S. Tsirkin
2015-09-30 17:28             ` Stephen Hemminger
2015-09-30 17:39               ` Michael S. Tsirkin
2015-09-30 17:43                 ` Stephen Hemminger
2015-09-30 18:50                   ` Michael S. Tsirkin
2015-09-30 20:00                     ` Gleb Natapov
2015-09-30 20:36                       ` Michael S. Tsirkin
2015-10-01  5:04                         ` Gleb Natapov
2015-09-30 17:44                 ` Gleb Natapov

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