From: Andi Kleen <ak@linux.intel.com>
To: speck@linutronix.de
Subject: [MODERATED] Re: [PATCH v2 6/8] MDSv2 3
Date: Mon, 10 Dec 2018 17:53:39 -0800 [thread overview]
Message-ID: <20181211015339.GD16024@tassilo.jf.intel.com> (raw)
In-Reply-To: <20181211004622.GA24945@agluck-desk>
On Mon, Dec 10, 2018 at 04:46:22PM -0800, speck for Luck, Tony wrote:
> On Tue, Dec 11, 2018 at 12:37:49AM +0000, speck for Andrew Cooper wrote:
> > On 10/12/2018 17:53, speck for Andi Kleen wrote:
> > > From: Andi Kleen <ak@linux.intel.com>
> > Interrupting the middle of the software sequence is only one half of the
> > problem.
> >
> > The other half is when an NMI/#MC/etc hits on the return to guest path
> > after executing VERW, at which point you've just refilled all the
> > buffers between trying to clear them, and returning to userspace.
>
> NMI would seem to be the only exploitable option (since user might
> user perf to arrange an NMI in this window ... user can't force #MC
> or SMI on command).
>
> Would NMI fill the microarchitectural buffers with secrets?
The problem is not NMI filling (afaik it doesn't), but NMI preventing the
proper clearing.
-Andi
next prev parent reply other threads:[~2018-12-11 1:53 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-10 17:53 [MODERATED] [PATCH v2 0/8] MDSv2 8 Andi Kleen
2018-12-10 17:53 ` [MODERATED] [PATCH v2 1/8] MDSv2 4 Andi Kleen
2018-12-11 14:14 ` [MODERATED] " Paolo Bonzini
2018-12-12 21:22 ` Konrad Rzeszutek Wilk
2018-12-12 21:28 ` Andi Kleen
2018-12-12 21:25 ` Konrad Rzeszutek Wilk
2018-12-10 17:53 ` [MODERATED] [PATCH v2 2/8] MDSv2 1 Andi Kleen
2018-12-10 22:49 ` [MODERATED] " Jiri Kosina
2018-12-11 0:03 ` Andi Kleen
2018-12-11 0:13 ` Kanth Ghatraju
2018-12-11 2:00 ` Andi Kleen
2018-12-11 5:36 ` Jiri Kosina
2018-12-11 10:03 ` Borislav Petkov
2018-12-12 21:31 ` Konrad Rzeszutek Wilk
2018-12-12 21:43 ` Andi Kleen
2018-12-12 22:17 ` Borislav Petkov
2018-12-12 22:40 ` Konrad Rzeszutek Wilk
2018-12-12 22:45 ` Borislav Petkov
2018-12-13 15:15 ` Andrew Cooper
2018-12-13 16:52 ` Borislav Petkov
2018-12-10 17:53 ` [MODERATED] [PATCH v2 3/8] MDSv2 5 Andi Kleen
2018-12-10 23:00 ` [MODERATED] " Linus Torvalds
2018-12-11 0:03 ` Andi Kleen
2018-12-11 0:43 ` Linus Torvalds
2018-12-11 1:33 ` Linus Torvalds
2018-12-11 2:12 ` Andi Kleen
2018-12-11 2:20 ` Linus Torvalds
2018-12-11 3:25 ` Andi Kleen
2018-12-11 17:55 ` Linus Torvalds
2018-12-11 18:10 ` Borislav Petkov
2018-12-11 18:21 ` Linus Torvalds
2018-12-11 18:26 ` Borislav Petkov
2018-12-11 19:47 ` Andi Kleen
2018-12-11 21:22 ` Thomas Gleixner
2018-12-12 14:02 ` [MODERATED] " Paolo Bonzini
2018-12-12 17:58 ` Andi Kleen
2018-12-12 18:47 ` Linus Torvalds
2018-12-13 19:44 ` Linus Torvalds
2018-12-13 20:48 ` Andi Kleen
2018-12-13 20:56 ` Linus Torvalds
2018-12-15 0:30 ` Andi Kleen
2018-12-11 2:10 ` Andi Kleen
2018-12-11 0:09 ` Andrew Cooper
2018-12-10 17:53 ` [MODERATED] [PATCH v2 4/8] MDSv2 0 Andi Kleen
2018-12-12 21:45 ` [MODERATED] " Konrad Rzeszutek Wilk
2018-12-12 22:09 ` Andi Kleen
2018-12-12 22:36 ` Konrad Rzeszutek Wilk
2018-12-10 17:53 ` [MODERATED] [PATCH v2 5/8] MDSv2 7 Andi Kleen
2018-12-11 0:33 ` [MODERATED] " Andrew Cooper
2018-12-12 18:05 ` Andrew Cooper
2018-12-12 21:41 ` Konrad Rzeszutek Wilk
2018-12-12 22:12 ` Andi Kleen
2018-12-10 17:53 ` [MODERATED] [PATCH v2 6/8] MDSv2 3 Andi Kleen
2018-12-11 0:37 ` [MODERATED] " Andrew Cooper
2018-12-11 0:46 ` Luck, Tony
2018-12-11 1:02 ` Andrew Cooper
2018-12-11 1:53 ` Andi Kleen [this message]
2018-12-10 17:53 ` [MODERATED] [PATCH v2 7/8] MDSv2 6 Andi Kleen
2018-12-10 17:53 ` [MODERATED] [PATCH v2 8/8] MDSv2 2 Andi Kleen
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