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From: Arnd Bergmann <arnd@kernel.org>
To: Mark Kettenis <mark.kettenis@xs4all.nl>
Cc: Rob Herring <robh@kernel.org>,
	sven@svenpeter.dev, DTML <devicetree@vger.kernel.org>,
	Will Deacon <will@kernel.org>, Hector Martin <marcan@marcan.st>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	"open list:IOMMU DRIVERS" <iommu@lists.linux-foundation.org>,
	Marc Zyngier <maz@kernel.org>,
	Mohamed Mediouni <mohamed.mediouni@caramail.com>,
	Robin Murphy <robin.murphy@arm.com>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	Stan Skowronek <stan@corellium.com>
Subject: Re: [PATCH 0/3] Apple M1 DART IOMMU driver
Date: Fri, 26 Mar 2021 21:03:32 +0100	[thread overview]
Message-ID: <CAK8P3a1CFHgjuzmefKcbC3MPeBD0USeTe7oZsTcQ=6tagG3Cvw@mail.gmail.com> (raw)
In-Reply-To: <c1bcd9821a8f8c05@bloch.sibelius.xs4all.nl>

On Fri, Mar 26, 2021 at 6:28 PM Mark Kettenis <mark.kettenis@xs4all.nl> wrote:

> I haven't figured out how the bypass stuff really works.  Corellium
> added support for it in their codebase when they added support for
> Thunderbolt, and some of the DARTs that seem to be related to
> Thunderbolt do indeed have a "bypass" property.  But it is unclear to
> me how the different puzzle pieces fit together for Thunderbolt.

As a general observation, bypass mode for Thunderbolt is what enabled
the http://thunderclap.io/ attack. This is extremely useful for debugging
a running kernel from another machine, but it's also something that
should never be done in a production kernel.

         Arnd
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  parent reply	other threads:[~2021-03-26 20:03 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-20 15:19 Sven Peter via iommu
2021-03-20 15:19 ` [PATCH 1/3] iommu: io-pgtable: add DART pagetable format Sven Peter via iommu
2021-03-24 16:37   ` Robin Murphy
2021-03-25 20:47     ` Sven Peter via iommu
2021-03-20 15:20 ` [PATCH 2/3] dt-bindings: iommu: add DART iommu bindings Sven Peter via iommu
2021-03-22  0:15   ` Rob Herring
2021-03-22 18:16     ` Sven Peter via iommu
2021-03-21 16:00 ` [PATCH 0/3] Apple M1 DART IOMMU driver Mark Kettenis
2021-03-21 17:22   ` Sven Peter via iommu
2021-03-21 18:35     ` Mark Kettenis
2021-03-22 22:17       ` Sven Peter via iommu
2021-03-23 20:00         ` Mark Kettenis
2021-03-23 21:03           ` Sven Peter via iommu
2021-03-21 17:28   ` Sven Peter via iommu
2021-03-23 20:53   ` Rob Herring
2021-03-23 22:33     ` Mark Kettenis
2021-03-25  7:53     ` Sven Peter via iommu
2021-03-25 11:50       ` Robin Murphy
2021-03-25 20:49         ` Sven Peter via iommu
2021-03-27 15:33         ` Sven Peter via iommu
2021-03-25 21:41       ` Arnd Bergmann
2021-03-26 15:59         ` Mark Kettenis
2021-03-26 16:09           ` Arnd Bergmann
2021-03-26 16:10           ` Sven Peter via iommu
2021-03-26 16:38             ` Arnd Bergmann
2021-03-26 17:06               ` Sven Peter via iommu
2021-03-26 17:26               ` Mark Kettenis
2021-03-26 17:34                 ` Robin Murphy
2021-03-26 17:51                   ` Sven Peter via iommu
2021-03-26 19:59                     ` Arnd Bergmann
2021-03-26 21:16                       ` Mark Kettenis
2021-03-27 15:30                       ` Sven Peter via iommu
2021-03-26 20:03                 ` Arnd Bergmann [this message]
2021-03-26 21:13                   ` Mark Kettenis
2021-03-24 15:29 ` Robin Murphy
2021-03-25  7:58   ` Sven Peter via iommu

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