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From: "Michael S. Tsirkin" <mst@redhat.com>
To: David Hildenbrand <david@redhat.com>
Cc: Dave Chinner <david@fromorbit.com>,
	Pankaj Gupta <pagupta@redhat.com>,
	dchinner@redhat.com, jack@suse.cz, kvm@vger.kernel.org,
	linux-nvdimm@ml01.01.org, jasowang@redhat.com,
	qemu-devel@nongnu.org, virtualization@lists.linux-foundation.org,
	adilger kernel <adilger.kernel@dilger.ca>,
	zwisler@kernel.org, Andrea Arcangeli <aarcange@redhat.com>,
	dave jiang <dave.jiang@intel.com>,
	darrick wong <darrick.wong@oracle.com>,
	vishal l verma <vishal.l.verma@intel.com>,
	willy@infradead.org, hch@infradead.org,
	linux-acpi@vger.kernel.org, jmoyer@redhat.com, nilal@redhat.com,
	riel@surriel.com, stefanha@redhat.com, imammedo@redhat.com,
	dan j williams <dan.j.williams@intel.com>,
	lcapitulino@redhat.com, kwolf@redhat.com,
	linux-ext4@vger.kernel.org, tytso@mit.edu,
	xiaoguangrong eric <xiaoguangrong.eric@gmail.com>,
	rjw@rjwysocki.net, linux-kernel@vger.kernel.org,
	linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	pbonzini@redhat.com
Subject: Re: [Qemu-devel] security implications of caching with virtio pmem (was Re: [PATCH v3 0/5] kvm "virtio pmem" device)
Date: Mon, 11 Feb 2019 18:07:02 -0500
Message-ID: <20190211180449-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <b2be7796-9dee-b9fd-87e5-1ae570aa7db6@redhat.com>

On Mon, Feb 11, 2019 at 11:58:15PM +0100, David Hildenbrand wrote:
> On 11.02.19 23:29, Dave Chinner wrote:
> > On Mon, Feb 11, 2019 at 02:29:46AM -0500, Pankaj Gupta wrote:
> >> Hello Dave,
> >> Are we okay with this?
> > 
> > Sure.
> > 
> > I'm not sure I agree with all the analysis presented, but, well, I
> > haven't looked any deeper because I'm tired of being shouted at and
> > being called argumentative for daring to ask hard questions about
> > this topic....
> 
> I think if you have concerns, they should definitely be discussed.
> Making people frustrated that review code is not what we want. Not at all.
> 
> I suggest that Pankaj properly documents what we found out so far about
> security concerns and properly describes intended use cases and answers
> other questions you had in the cover letter / documentation of the
> follow up series.
> 
> Thanks Dave!

Right. Also, there's an open question that you posed:
	Also other storage devices have caches like that (well, the caches size
	depends on the device) - thinking especially about storage systems -
	which would in my opinion, also allow similar leaks. How are such
	security concerns handled there? Are they different (besides eventually
	access speed)?
and that needs some looking into, and reporting on.


> > 
> > Cheers,
> > 
> > Dave.
> > 
> 
> 
> -- 
> 
> Thanks,
> 
> David / dhildenb

      reply index

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-09 14:47 [PATCH v3 0/5] kvm "virtio pmem" device Pankaj Gupta
2019-01-09 14:47 ` [PATCH v3 1/5] libnvdimm: nd_region flush callback support Pankaj Gupta
2019-01-09 14:47 ` [PATCH v3 2/5] virtio-pmem: Add virtio pmem driver Pankaj Gupta
2019-01-14 15:54   ` Michael S. Tsirkin
2019-01-14 15:54     ` Michael S. Tsirkin
     [not found]     ` <20190114105314-mutt-send-email-mst-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2019-01-15  6:33       ` Pankaj Gupta
2019-01-15  6:33         ` Pankaj Gupta
2019-01-09 14:47 ` [PATCH v3 3/5] libnvdimm: add nd_region buffered dax_dev flag Pankaj Gupta
2019-01-09 14:47 ` [PATCH v3 4/5] ext4: disable map_sync for virtio pmem Pankaj Gupta
2019-01-09 14:47 ` [PATCH v3 5/5] xfs: " Pankaj Gupta
2019-01-09 14:47   ` Pankaj Gupta
2019-01-09 16:26   ` Darrick J. Wong
2019-01-09 18:08     ` Pankaj Gupta
     [not found] ` <20190109144736.17452-1-pagupta-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2019-01-10  1:26   ` [PATCH v3 0/5] kvm "virtio pmem" device Dave Chinner
2019-01-10  1:26     ` Dave Chinner
2019-01-10  2:40     ` Rik van Riel
2019-01-10  2:40       ` Rik van Riel
2019-01-10 10:17     ` Jan Kara
2019-01-10 10:17       ` Jan Kara
     [not found]       ` <20190110101757.GC15790-4I4JzKEfoa/jFM9bn6wA6Q@public.gmane.org>
2019-01-13  1:38         ` Pankaj Gupta
2019-01-13  1:38           ` Pankaj Gupta
     [not found]           ` <1354249849.63357171.1547343519970.JavaMail.zimbra-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2019-01-13  1:43             ` Dan Williams
2019-01-13  1:43               ` Dan Williams
     [not found]               ` <CAPcyv4hwcgTUpgNCefCGu4DvgkYBp5b=f+hJ+FC=s5APYKoycg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2019-01-13  2:17                 ` [Qemu-devel] " Pankaj Gupta
2019-01-13  2:17                   ` Pankaj Gupta
     [not found]                   ` <540171952.63371441.1547345866585.JavaMail.zimbra-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2019-01-14  9:55                     ` Jan Kara
2019-01-14  9:55                       ` Jan Kara
     [not found]                       ` <20190114095520.GC13316-4I4JzKEfoa/jFM9bn6wA6Q@public.gmane.org>
2019-01-14 10:16                         ` Pankaj Gupta
2019-01-14 10:16                           ` Pankaj Gupta
2019-01-11  7:45     ` Pankaj Gupta
2019-01-11  7:45       ` Pankaj Gupta
     [not found]       ` <1326478078.61913951.1547192704870.JavaMail.zimbra-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2019-01-13 23:29         ` Dave Chinner
2019-01-13 23:29           ` Dave Chinner
2019-01-13 23:38           ` Matthew Wilcox
2019-01-13 23:38             ` Matthew Wilcox
     [not found]             ` <20190113233820.GX6310-PfSpb0PWhxZc2C7mugBRk2EX/6BAtgUQ@public.gmane.org>
2019-01-14  2:50               ` Dave Chinner
2019-01-14  2:50                 ` Dave Chinner
2019-01-14  7:15               ` Pankaj Gupta
2019-01-14  7:15                 ` Pankaj Gupta
     [not found]                 ` <942065073.64011540.1547450140670.JavaMail.zimbra-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2019-01-14 21:25                   ` Dave Chinner
2019-01-14 21:25                     ` Dave Chinner
2019-01-14 21:35                     ` Dan Williams
2019-01-14 21:35                       ` Dan Williams
     [not found]                       ` <CAPcyv4jtPcLV-s0sKNHwwk0ug7GLBV6699dpm1h3r2xSo879dg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2019-01-14 22:21                         ` Dave Chinner
2019-01-14 22:21                           ` Dave Chinner
2019-01-15  2:19                           ` Michael S. Tsirkin
2019-01-15  2:19                             ` Michael S. Tsirkin
     [not found]                             ` <20190114205031-mutt-send-email-mst-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2019-01-15  5:37                               ` [Qemu-devel] " Pankaj Gupta
2019-01-15  5:37                                 ` Pankaj Gupta
2019-01-15  5:35                           ` Pankaj Gupta
2019-01-15  5:35                             ` Pankaj Gupta
     [not found]                             ` <1684638419.64320214.1547530506805.JavaMail.zimbra-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2019-01-15 20:42                               ` Dave Chinner
2019-01-15 20:42                                 ` Dave Chinner
2019-02-04 22:56 ` security implications of caching with virtio pmem (was Re: [PATCH v3 0/5] kvm "virtio pmem" device) Michael S. Tsirkin
2019-02-05  7:29   ` [Qemu-devel] " Pankaj Gupta
2019-02-06 14:00   ` David Hildenbrand
2019-02-06 18:01     ` Michael S. Tsirkin
2019-02-11  7:29   ` [Qemu-devel] " Pankaj Gupta
2019-02-11 22:29     ` Dave Chinner
2019-02-11 22:58       ` David Hildenbrand
2019-02-11 23:07         ` Michael S. Tsirkin [this message]

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