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..
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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?)
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Replying to @cr1901
Yes. But in times of CUDA uniform memory a GPU write is not limited to GPU memory.
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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.
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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..
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That should be handled by the IOMMU unit, not the GPU though. BTW does your CPU have one? (DMAR in dmesg)?
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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..
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Sorry I don't know about AMD, need to look it up, I think DMAR might be Intel's name
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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
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Replying to @oe1cxw @astarasikov
Bikeshedding: Is this output from grep? I don't seem to remember a ".." between matches on my grep.
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Replying to @cr1901 @astarasikov
dmesg | grep -C2 IOMMU
7:19 AM - 19 Apr 2017
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