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oe1cxw's profile
Claire Xen 🏳️‍⚧️🏳️‍🌈🧙🏻‍♀️ BLM 🏴🚩
Claire Xen 🏳️‍⚧️🏳️‍🌈🧙🏻‍♀️ BLM 🏴🚩
Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩
@oe1cxw

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Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩

@oe1cxw

Neurodiverse trans geek girl. Yosys, RISC-V, SAT/SMT.

She/her/hers
clairexen.net
Joined September 2014

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    1. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 19 Apr 2017
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      I just managed to kill the driver for my network card with an out-of-bounds write in my GPU code!? Security of those GPUs must be awesome..

      4 replies 11 retweets 34 likes
    2. William D. Jones‏ @cr1901 19 Apr 2017
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      Replying to @oe1cxw

      How in the world is this possible?! (By write in your GPU code, I assume you mean the write was GPU-initiated?)

      2 replies 0 retweets 0 likes
    3. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 19 Apr 2017
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      Replying to @cr1901

      Yes. But in times of CUDA uniform memory a GPU write is not limited to GPU memory.

      1 reply 0 retweets 4 likes
    4. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 19 Apr 2017
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      Replying to @oe1cxw @cr1901

      I've managed to simply crash my machine with a buggy GPU kernels many times. Sometimes it just kills my desktop but can still login via ssh.

      3 replies 0 retweets 2 likes
    5. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 19 Apr 2017
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      Replying to @oe1cxw @cr1901

      Theoretically the memory protection scheme used by the OS is replicated on the GPU. But in practice we don't seem to be there yet..

      2 replies 0 retweets 1 like
    6. Alexander Tarasikov‏ @astarasikov 19 Apr 2017
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      Replying to @oe1cxw @cr1901

      That should be handled by the IOMMU unit, not the GPU though. BTW does your CPU have one? (DMAR in dmesg)?

      1 reply 0 retweets 2 likes
      Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 19 Apr 2017
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      Replying to @astarasikov @cr1901

      Hmm.. Should have (AMD FX, aka AMD Bulldozer), but no "DMAR" in dmesg. Maybe there's a BIOS switch that I have to enable? Rebooting..

      6:45 AM - 19 Apr 2017
      2 replies 0 retweets 0 likes
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        1. Alexander Tarasikov‏ @astarasikov 19 Apr 2017
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          Replying to @oe1cxw @cr1901

          Sorry I don't know about AMD, need to look it up, I think DMAR might be Intel's name

          1 reply 0 retweets 1 like
        2. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 19 Apr 2017
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          Replying to @astarasikov @cr1901

          Yep. Was disabled in BIOS. What a reasonable default! Grrr. Now that its enabled this should drastically improve my GPU hacking productivitypic.twitter.com/QdWWln9qHk

          2 replies 0 retweets 9 likes
        3. Show replies
        1. Alexander Tarasikov‏ @astarasikov 19 Apr 2017
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          Replying to @oe1cxw @cr1901

          http://www.linux-kvm.org/page/How_to_assign_devices_with_VT-d_in_KVM … some instructions to check IOMMU. Hope this helps but not really sure things are good out of the box

          0 replies 0 retweets 1 like
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