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Does arm use speculative execution?
On impacted processors, Arm says that while computing operations in advance part of the speculative execution process, when there’s a change in the Arm CPU’s instruction control flow, the CPU reacts by executing instructions found linearly in its memory, past the change in the control flow — an unwanted scenario.
Is arm out-of-order execution?
This may or may not include out-of-order execution. According to Wikipedia, the Cortex-A9 uses out-of-order execution, whereas the Cortex-A8 does not; however, both implement the same ARM architecture (ARMv7-A).
What is the primary advantage of speculative execution?
Along with multiple branch prediction (used to predict the instructions most likely to be needed in the near future) and dataflow analysis (used to align instructions for optimal execution, as opposed to executing them in the order they came in), speculative execution delivered a dramatic performance improvement over …
Are there any protections for speculative execution in Windows?
Microsoft has released protections against a new subclass of speculative execution side-channel vulnerabilities known as Microarchitectural Data Sampling for 64-Bit (x64) versions of Windows ( CVE-2018-11091, CVE-2018-12126, CVE-2018-12127, CVE-2018-12130 ).
How to protect against speculative execution side channel?
Security advisories ADV180002 , ADV180012, and ADV190013 provide information about the risk that is posed by these vulnerabilities, and they help you identify the default state of mitigations for Windows client systems. The following table summarizes the requirement of CPU microcode and the default status of the mitigations on Windows clients.
What do I need to know about speculative execution?
This article provides information and updates for a new class of attacks known as “speculative execution side-channel attacks.” It also provides a comprehensive list of Windows client and server resources to help keep your devices protected at home, at work, and across your enterprise.
How to protect against speculative execution side of Azure Stack?
To get all available protections, hardware or firmware updates and software updates are required. This includes microcode from device OEMs and, in some cases, updates to antivirus software. This advisory addresses the following vulnerabilities: To learn more about this class of vulnerabilities, see ADV180002.