AMD admits third-generation Ryzen processors suffer from Specter-like attack

AMD admits third-generation Ryzen processors suffer from Specter-like attack
AMD admits third-generation Ryzen processors suffer from Specter-like attack
You must remember Specter and Meltdown, two vulnerabilities discovered in Intel processors in early 2018. Now, AMD has admitted that the third generation of Ryzen CPUs also suffer from a variant of the first problem.

The statement came in the article published by the manufacturer recently, called Security Analysis of AMD Predictive Store Forwarding (PSF). According to the report, an optimization within the Zen3 microarchitecture can be explored in a similar way as it was Specter.

In practice, the implementation of the PSF ended up giving rise to attacks similar to Specter v1, v2 and v3. The reason would be the speculative nature. The architects even declared that the situation would be at the same level as Specter v4.

O Predictive Store Forwarding it consists of hardware optimization with a focus on improving the performance of code execution, by predicting dependencies between loads and stores. It is as if the resource made provision to allow the processor to carry out instructions in the sequence with greater agility.

The security breach would happen when the FHP forecast comes out incorrectly. It can happen in two situations: when the group had a dependency for a while and then stopped; or when there is a alias in the tool structure, which would be used at the wrong time.

The affected models include the Ryzen 5000 and Epyc 7003 lines, which use the Zen3 architecture.

Solution

According to AMD, it is possible to disable the optimization. However, the absence of the feature will lead to a drop in performance. Thus, the manufacturer believes that the action is not worth it, unless there are more critical advances in CPUs.

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