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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Joe Fitz‏ @securelyfitz 26 Feb 2019
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      OK, Thunderclap sounds pretty awesome. Bypassing IOMMU protections by emulating a trusted device and pushing the limits of memory regions you get access to. Technical details: https://thunderclap.io/ 

      3 replies 90 retweets 153 likes
      Show this thread
    2. Joe Fitz‏ @securelyfitz 26 Feb 2019
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      Even cooler, they published all their tools. Big and $4500 right now, but looking forward to a cost-reduced version, maybe to update my slotscreamers :)

      2 replies 2 retweets 18 likes
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    3. Joe Fitz‏ @securelyfitz 26 Feb 2019
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      From whitepaper - FPGA PCIe TLPs -> Qemu calls to emulate the NIC.pic.twitter.com/0LjZkPTa1T

      1 reply 0 retweets 8 likes
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    4. Joe Fitz‏ @securelyfitz 26 Feb 2019
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      The notes mention using the arria fpga because it was the only one that allowed custom PCIe config registers. I think that's cause they wanted to use a hard block and not implement their own PCIe block. I look forward to doing this on an open fpga toolchain soon!

      2 replies 0 retweets 8 likes
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    5. Joe Fitz‏ @securelyfitz 26 Feb 2019
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      Really glad to see someone finally showing how bad ATS is, I've been complaining about this for 5 years (but never actually did anything about it)pic.twitter.com/86cK3i9rM5

      2 replies 2 retweets 16 likes
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    6. Joe Fitz‏ @securelyfitz 26 Feb 2019
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      Here's the part of the ATS spec that demands that all devices be well behaved and never do anything malicious like what thunderclap does:pic.twitter.com/sx38s6P0sL

      3 replies 1 retweet 21 likes
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    7. Hector Martin‏ @marcan42 27 Feb 2019
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      Replying to @securelyfitz

      IIRC we tried this on the PS4 and it didn't actually work (presumably ATS was not supported). If Thunderbolt actually allows this then whoever thought was a good idea needs a few hits with a cluebat...

      1 reply 0 retweets 1 like
    8. Joe Fitz‏ @securelyfitz 27 Feb 2019
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      Replying to @marcan42

      When I first examined ATS it was only supported on server parts, i'm not sure when it trickled down to everything.

      1 reply 0 retweets 1 like
      Hector Martin‏ @marcan42 27 Feb 2019
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      Replying to @securelyfitz

      That was pretty much our conclusion too, at the time.

      2:31 AM - 27 Feb 2019
      0 replies 0 retweets 0 likes

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