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AMD Errata: RDSEED failure on AMD Zen 5 Processors

amd.com

20 points by jcalvinowens 8 hours ago

jcalvinowens 8 hours ago

See also: https://lore.kernel.org/lkml/20251103142800.GFaQi78AgT-qjY30...

jcalvinowens 6 hours ago

I wrote a silly little testcase: https://gist.github.com/jcalvinowens/06530e6fc86f3b2c97a7027...

...but both affected znver5 machines I have "pass", so clearly there's more to it than AMD is telling us.

You should be able to get away with "-march=znver5 -mno-rdrnd -mno-rdseed" in CFLAGS if you care.

  • jcalvinowens 3 hours ago

    Oh, actually the original report was very specific: https://lore.kernel.org/all/20251018024010.4112396-1-gourry@...

rasz 7 hours ago

again? https://arstechnica.com/gadgets/2019/10/how-a-months-old-amd... ZEN seems to have suspiciously a lot of those rdrand "bugs"

  • hulitu an hour ago

    CIA and NSA really need access to your data. /s