From: Mark Kettenis <mark.kettenis@xs4all.nl>
To: Arnd Bergmann <arnd@kernel.org>
Cc: robh@kernel.org, sven@svenpeter.dev, devicetree@vger.kernel.org,
will@kernel.org, marcan@marcan.st, linux-kernel@vger.kernel.org,
iommu@lists.linux-foundation.org, maz@kernel.org,
mohamed.mediouni@caramail.com, robin.murphy@arm.com,
linux-arm-kernel@lists.infradead.org, stan@corellium.com
Subject: Re: [PATCH 0/3] Apple M1 DART IOMMU driver
Date: Fri, 26 Mar 2021 22:13:35 +0100 (CET) [thread overview]
Message-ID: <c1bcda5b25b1f37d@bloch.sibelius.xs4all.nl> (raw)
In-Reply-To: <CAK8P3a1CFHgjuzmefKcbC3MPeBD0USeTe7oZsTcQ=6tagG3Cvw@mail.gmail.com> (message from Arnd Bergmann on Fri, 26 Mar 2021 21:03:32 +0100)
> From: Arnd Bergmann <arnd@kernel.org>
> Date: Fri, 26 Mar 2021 21:03:32 +0100
>
> 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.
No kidding! I was surprised to see the bypass support on the
Thunderbolt-related nodes.
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next prev parent reply other threads:[~2021-03-26 21:13 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-20 15:19 [PATCH 0/3] Apple M1 DART IOMMU driver 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
2021-03-26 21:13 ` Mark Kettenis [this message]
2021-03-24 15:29 ` Robin Murphy
2021-03-25 7:58 ` Sven Peter via iommu
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