Új hozzászólás Aktív témák

• #4919 S_x96x_S addikt

  Új Válasz 2021-03-31 16:09:46 #4919

  Új hozzászólás

  Összes hozzászólása itt Válaszok az összes hozzászólására itt Válaszok erre a hozzászólásra

  Privát üzenet küldése

  

  S_x96x_S

  addikt

  ZEN3 - PSF

  SECURITY ANALYSIS OF AMD PREDICTIVE STORE FORWARDING ( March 2021 )
  https://www.amd.com/system/files/documents/security-analysis-predictive-store-forwarding.pdf

  "AMD “Zen3” processors feature a new technology called Predictive Store Forwarding (PSF). PSF is a hardware-based micro-architectural optimization designed to improve the performance of code execution by predicting dependencies between loads and stores. Like technologies such as branch prediction, with PSF the processor “guesses” what the result of a load is likely to be, and speculatively executes subsequent instructions. In the event that the processor incorrectly speculated on the result of the load, it is designed to detect this and flush the incorrect results from the CPU pipeline.
  "
  ....

  "
  CONCLUSION:
  Predictive Store Forwarding is a new feature in AMD Zen3 CPUs which may improve application performance but also has security implications. While AMD is not currently aware of any code that would be considered vulnerable due to PSF behavior, this whitepaper examines the potential security implications of PSF, in general, as well as mechanisms that are designed to disable the feature if desired. AMD believes that for most applications, the security risk of PSF is likely low and where isolation is required, techniques such as address space isolation are preferred over software sandboxing.

  AMD recommends leaving the Predictive Store Forwarding feature enabled as the default setting.
  "

Új hozzászólás Aktív témák