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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Andrew Zonenberg‏ @azonenberg Apr 5

      The general trend for laptops seems to be going thin and light at the expense of connectivity (like Ethernet). Would you be interested in a laptop that went the other way and included both a 1000base-T RJ45 and a SFP+ or QSFP+ cage?

      5 replies 2 retweets 4 likes
    2. Rich Felker‏ @RichFelker Apr 5
      Replying to @azonenberg

      No, just lots of USB3 ports. Can do everything else over USB and it's thinner, lighter, safer, & needs fewer drivers.

      1 reply 0 retweets 0 likes
    3. Andrew Zonenberg‏ @azonenberg Apr 5
      Replying to @RichFelker

      USB is safer than Ethernet? It needs kernel drivers etc, and a USB device can pretend to be all kinds of nastiness. Meanwhile, a LAN is a LAN and there's nothing else it can do.

      1 reply 0 retweets 1 like
    4. Rich Felker‏ @RichFelker Apr 5
      Replying to @azonenberg

      Yes. Onboard/PCIe ethernet likely has bus-mastering capabilities, integration with ME, boot-from-LAN functionality, etc. USB ethernet is purely a standardized protocol over USB.

      1 reply 0 retweets 0 likes
    5. Rich Felker‏ @RichFelker Apr 5
      Replying to @RichFelker @azonenberg

      In an ideal world the only real hw driver is the USB host controller, and everything else is just protocols (that could be implemented purely in isolated userspace contexts with no mmio/dma/etc programming).

      1 reply 0 retweets 1 like
      Rich Felker‏ @RichFelker Apr 5
      Replying to @RichFelker @azonenberg

      "Pretend to be all kinds of nastiness" is a flaw in OS handling of USB devices (automatically assigning a role/privilege to a newly connected device) rather than any inherent problem with USB.

      11:34 AM - 5 Apr 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Andrew Zonenberg‏ @azonenberg Apr 5
          Replying to @RichFelker

          In that case ME, boot-from-LAN, etc are OS/BIOS/mobo failures rather than inherent problems with Ethernet. And bus mastering is perfectly safe if you have proper memory protection at the physical address level

          2 replies 0 retweets 1 like
        3. Andrew Zonenberg‏ @azonenberg Apr 5
          Replying to @azonenberg @RichFelker

          For example, in Antikernel the NIC requests a page of RAM directly from the hardware memory allocator for DMA (it has no access to any other RAM), then writes an incoming frame to it and sends a pointer to that page to the host TCP/IP stack for processing.

          1 reply 0 retweets 2 likes
        4. Andrew Zonenberg‏ @azonenberg Apr 5
          Replying to @azonenberg @RichFelker

          Any attempt to access memory not specifically allocated to the NIC results in a bus error. Being a master just means you don't waste CPU time until the frame hits the IP stack (assuming you don't have TCP/IP offload in hardware).

          0 replies 0 retweets 2 likes
        5. End of conversation

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