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Restbleed

I

igor_kavinski

Lifer
Retbleed: Arbitrary Speculative Code Execution with Return Instructions – Computer Security Group (ethz.ch)

Mitigating Retbleed in the Linux kernel required a substantial effort, involving changes to 68 files, 1783 new lines and 387 removed lines. Our performance evaluation shows that mitigating Retbleed has unfortunately turned out to be expensive: we have measured between 14% and 39% overhead with the AMD and Intel patches respectively.
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39% performance loss for Intel CPUs! 😱
 
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