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nmgrm's profile
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@nmgrm

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@nmgrm

Joined October 2015

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    1. Kia‏☆‏ @alt_kia Sep 14

      Kia‏☆ Retweeted Arrigo Triulzi

      mindblowingly cursed futurehttps://twitter.com/cynicalsecurity/status/1040611124784312321 …

      Kia‏☆ added,

      Arrigo Triulzi @cynicalsecurity
      There’s x86 in the new iPhone X baseband. Seriously. https://lcq2.github.io/x86_iphone/ 
      5 replies 8 retweets 61 likes
    2. 𝖢𝗁𝗋𝗂𝗌 𝖠𝗅𝗅𝖾𝗇 ΧΡ ( 👻, LP &  🏴)‏ @bitemyapp Sep 14
      Replying to @alt_kia

      oh come on now you're better than this

      2 replies 0 retweets 0 likes
    3. Kia‏☆‏ @alt_kia Sep 15
      Replying to @bitemyapp

      the x86 privilege model is materially more complex than the ARM equivalent and is much less amenable to formal verification, SMM code plays a crucial role in maintaining platform security properties and cannot be "stubbed out", you actually need to respond to SMIs because they

      1 reply 1 retweet 6 likes
    4. Kia‏☆‏ @alt_kia Sep 15
      Replying to @alt_kia @bitemyapp

      get raised when code writes to certain control registers (and the SMM code *must countermand the writes*, rather than the CPU blocking the writes from the beginning), and SMM prot is a mess of complicated control regs rather than using MMU (like ARM TZ): https://www.blackhat.com/docs/us-15/materials/us-15-Domas-The-Memory-Sinkhole-Unleashing-An-x86-Design-Flaw-Allowing-Universal-Privilege-Escalation.pdf …

      1 reply 1 retweet 3 likes
    5. Kia‏☆‏ @alt_kia Sep 15
      Replying to @alt_kia

      pic.twitter.com/PG5arkuBV9

      2 replies 0 retweets 2 likes
    6. Kia‏☆‏ @alt_kia Sep 15
      Replying to @alt_kia

      pic.twitter.com/vLgIVmHSsa

      1 reply 0 retweets 3 likes
    7. Kia‏☆‏ @alt_kia Sep 15
      Replying to @alt_kia @bitemyapp

      it's not reflexive Intel-hating, it's that there's legit problems with platforms that require motherboard OEMs to ship correct SMM code (that needs to handle arbitrary input securely) to enforce properties that other architectures enforce with either MMU or a few lines of Verilog

      1 reply 2 retweets 6 likes
    8. Kia‏☆‏ @alt_kia Sep 15
      Replying to @alt_kia @bitemyapp

      and simple verilog code ("only issue a write to a protected reg if privilege level is high enough") is far easier to verify against simple properties ("don't write to these control regs if you're not sufficiently privileged") than *all* the interworking components for the Intel-

      1 reply 0 retweets 2 likes
    9. Kia‏☆‏ @alt_kia Sep 15
      Replying to @alt_kia @bitemyapp

      like scheme -- which forcibly involves stuff like "semantics of SMI interrupts", "memory model", "multi-core/multi-socket considerations", and of course "the correctness of Turing-complete code provided by your motherboard OEM written by bad C coders"

      2 replies 0 retweets 3 likes
      crypt‏ @nmgrm Sep 15
      Replying to @alt_kia @bitemyapp

      this thread is like femdom except for cpu architectures

      11:11 AM - 15 Sep 2018
      • 2 Likes
      • Vineland (#Based, #Redpilled) 𝖢𝗁𝗋𝗂𝗌 𝖠𝗅𝗅𝖾𝗇 ΧΡ (👻, LP & 🏴)
      1 reply 0 retweets 2 likes
        1. New conversation
        2. Kia‏☆‏ @alt_kia Sep 15
          Replying to @nmgrm @bitemyapp

          what how i don't understand

          1 reply 0 retweets 0 likes
        3. crypt‏ @nmgrm Sep 15
          Replying to @alt_kia @bitemyapp

          im just really outside my depth on it

          1 reply 0 retweets 1 like
        4. 1 more reply

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