I wonder if only the threads using rdrand are affected or other threads will slow down because of rdrand being called. If it Is the latter, this would be a potential DoS attack. :/
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RdRand Performance As Bad As ~3% Original Speed With CrossTalk/SRBDS Mitigation
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Originally posted by ryao View PostI wonder if only the threads using rdrand are affected or other threads will slow down because of rdrand being called. If it Is the latter, this would be a potential DoS attack. :/
The really bad thing about this specular execution vulnerability is, that it leaks information between physical cores!! So a mitigation for VMs where you pin a VM on one core and the other on another for example, won´t work. This sets it appart from all the other currently known speculative execution bugs.
As Intel has often a homogenous chip design, this won´t even effect just a "cluster" but probably all cores on one die / processor.Last edited by Spacefish; 09 June 2020, 08:06 PM.
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Originally posted by Adarion View PostOuch. Just ouch. And it is microcode so it will affect everything that makes use of RdRand.
Either that slipped through testing or it is inevitable.
Either way: Ouch.
Originally posted by Phoronixworkloads more common to servers may be impacted. Intel supports system administrators disabling the mitigation if no untrusted software is running on the software, if RDRAND/RDSEED is only used where the random value is not important for security
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Originally posted by theriddick View PostYou would think Intel hw fix these issues in upcoming architecture like 10nm, but I hear their not, can't be bothered. ..
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Originally posted by theriddick View PostYou would think Intel hw fix these issues in upcoming architecture like 10nm, but I hear their not, can't be bothered. ..
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