Skip to content
By using Twitter’s services you agree to our Cookies Use. We and our partners operate globally and use cookies, including for analytics, personalisation, and ads.
  • Home Home Home, current page.
  • About

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @
  • Language: English
    • Bahasa Indonesia
    • Bahasa Melayu
    • Català
    • Čeština
    • Dansk
    • Deutsch
    • English UK
    • Español
    • Filipino
    • Français
    • Hrvatski
    • Italiano
    • Magyar
    • Nederlands
    • Norsk
    • Polski
    • Português
    • Română
    • Slovenčina
    • Suomi
    • Svenska
    • Tiếng Việt
    • Türkçe
    • Ελληνικά
    • Български език
    • Русский
    • Српски
    • Українська мова
    • עִבְרִית
    • العربية
    • فارسی
    • मराठी
    • हिन्दी
    • বাংলা
    • ગુજરાતી
    • தமிழ்
    • ಕನ್ನಡ
    • ภาษาไทย
    • 한국어
    • 日本語
    • 简体中文
    • 繁體中文
  • Have an account? Log in
    Have an account?
    · Forgot password?
    New to Twitter?
    Sign up
marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

Tweets

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

Tweets

  • © 2021 Twitter
  • About
  • Help Center
  • Terms
  • Privacy policy
  • Imprint
  • Cookies
  • Ads info
Dismiss
Previous
Next

Go to a person's profile

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @

Promote this Tweet

Block

  • Tweet with a location

    You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more

    Your lists

    Create a new list

    Under 100 characters, optional
    Privacy

    Copy link to Tweet

    Embed this Tweet

    Embed this Video

    Add this Tweet to your website by copying the code below. Learn more

    Add this video to your website by copying the code below. Learn more

    Hmm, there was a problem reaching the server.

    By embedding Twitter content in your website or app, you are agreeing to the Twitter Developer Agreement and Developer Policy.

    Preview

    Why you're seeing this ad

    Log in to Twitter

    · Forgot password?
    Don't have an account? Sign up »

    Sign up for Twitter

    Not on Twitter? Sign up, tune into the things you care about, and get updates as they happen.

    Sign up
    Have an account? Log in »

    Two-way (sending and receiving) short codes:

    Country Code For customers of
    United States 40404 (any)
    Canada 21212 (any)
    United Kingdom 86444 Vodafone, Orange, 3, O2
    Brazil 40404 Nextel, TIM
    Haiti 40404 Digicel, Voila
    Ireland 51210 Vodafone, O2
    India 53000 Bharti Airtel, Videocon, Reliance
    Indonesia 89887 AXIS, 3, Telkomsel, Indosat, XL Axiata
    Italy 4880804 Wind
    3424486444 Vodafone
    » See SMS short codes for other countries

    Confirmation

     

    Welcome home!

    This timeline is where you’ll spend most of your time, getting instant updates about what matters to you.

    Tweets not working for you?

    Hover over the profile pic and click the Following button to unfollow any account.

    Say a lot with a little

    When you see a Tweet you love, tap the heart — it lets the person who wrote it know you shared the love.

    Spread the word

    The fastest way to share someone else’s Tweet with your followers is with a Retweet. Tap the icon to send it instantly.

    Join the conversation

    Add your thoughts about any Tweet with a Reply. Find a topic you’re passionate about, and jump right in.

    Learn the latest

    Get instant insight into what people are talking about now.

    Get more of what you love

    Follow more accounts to get instant updates about topics you care about.

    Find what's happening

    See the latest conversations about any topic instantly.

    Never miss a Moment

    Catch up instantly on the best stories happening as they unfold.

    1. Hector Martin‏ @marcan42 3 Jul 2018
      • Report Tweet
      • Report NetzDG Violation

      LPC bus tap. I feel like I'm modding PS2s again...pic.twitter.com/cXqzRa6SAN

      14 replies 46 retweets 319 likes
      Show this thread
    2. Hector Martin‏ @marcan42 3 Jul 2018
      • Report Tweet
      • Report NetzDG Violation

      TIL LPC is mixed-endian. Intel, what were you smoking?

      3 replies 3 retweets 35 likes
      Show this thread
    3. Hector Martin‏ @marcan42 3 Jul 2018
      • Report Tweet
      • Report NetzDG Violation

      Looks like it works. I see a bunch of Super I/O accesses, then COM1, Some port 90h pokes but nobody's listening (POST codes?), PS/2 KBC, and more pokes to 90h and 99h.pic.twitter.com/MEA8cTpxV9

      1 reply 4 retweets 12 likes
      Show this thread
    4. Hector Martin‏ @marcan42 3 Jul 2018
      • Report Tweet
      • Report NetzDG Violation

      Photo of the set-up.pic.twitter.com/Np9GmvWOFt

      6 replies 8 retweets 64 likes
      Show this thread
    5. Hector Martin‏ @marcan42 3 Jul 2018
      • Report Tweet
      • Report NetzDG Violation

      Why am I doing this? TPM sniffer/MitM PoC. Because people who think that transparent-mode (TPM-only) BitLocker is secure are funny.

      12 replies 13 retweets 58 likes
      Show this thread
    6. Andrew Zonenberg‏ @azonenberg 3 Jul 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @marcan42

      I never understood the point of that. If the TPM has the keys and there's no auth from CPU to TPM, can't you just see the keys over the bus? Equally, can you not just lie to the TPM about PCR values when doing remote attestation?

      1 reply 0 retweets 1 like
    7. Hector Martin‏ @marcan42 3 Jul 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @azonenberg

      Easiest is the reset attack. Boot Linux or whatever, hit the TPM reset pin, feed it whatever PCR values it wants pretending to be the BIOS, get keys. DRTM makes it more complicated due to HW cycle differences but an FPGA will take care of that.

      2 replies 0 retweets 6 likes
    8. Andrew Zonenberg‏ @azonenberg 3 Jul 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @marcan42

      If the TPM will cough up cleartext keys to anyone who asks with the right PCRs, what's even the point of having antitamper mesh on the chip? Seems like you'd be just as well served with a PIC :P

      1 reply 0 retweets 1 like
    9. Hector Martin‏ @marcan42 3 Jul 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @azonenberg

      Yeah. Well, you can generate asymmetric keys inside the TPM and use that to attest a given physical TPM. Doesn't help with BitLocker though. Also then it turns out your TPM is Infineon and generates ROCA RSA keys anyway.

      1 reply 0 retweets 0 likes
    10. Andrew Zonenberg‏ @azonenberg 3 Jul 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @marcan42

      Yes, you can attest the physical TPM. But you can't attest that the CPU is running any particular software. Calculate the PCRs it expects and feed them over the MITM bus then get it to sign your challenge blob.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 3 Jul 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @azonenberg

      Of course. It's just an anticloning thing, really. If you steal the TPM then you can always use it as an oracle.

      1:59 PM - 3 Jul 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        1. Andrew Zonenberg‏ @azonenberg 3 Jul 2018
          • Report Tweet
          • Report NetzDG Violation
          Replying to @marcan42

          So what you're saying is, the original use case of proving that a Windows PC is running an unmodified OS rather than one with (say) a DVD screengrabber in the GPU driver was completely broken from day one. I knew DRM was flawed but didn't think TPMs were *that* useless...

          1 reply 0 retweets 4 likes
        2. Hector Martin‏ @marcan42 3 Jul 2018
          • Report Tweet
          • Report NetzDG Violation
          Replying to @azonenberg

          Basically the entirety of x86 platform security is a joke. Spectre & Meltdown, x86 is borked deep down at the basics. Stuff like AMD SEV? Ha. You wish. Seriously, it's all snake oil to appease the enterprise & media sectors.

          2 replies 0 retweets 5 likes
        3. Show replies

      Loading seems to be taking a while.

      Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.

        Promoted Tweet

        false

        • © 2021 Twitter
        • About
        • Help Center
        • Terms
        • Privacy policy
        • Imprint
        • Cookies
        • Ads info