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Final determination and validation of whether an update can be applied to a processor is performed during decryption via the processor. [18] Each microcode update is specific to a particular CPU revision, and is designed to be rejected by CPUs with a different stepping level. Microcode updates are encrypted to prevent tampering and to enable ...
[59] AMD released a microcode update to fix it. [60] In August 2023 a vulnerability in AMD's Zen 1, Zen 2, Zen 3, and Zen 4 microarchitectures called Inception [61] [62] was revealed and assigned CVE-2023-20569. According to AMD it is not practical but the company will release a microcode update for the affected products.
Intel promised microcode updates to resolve the vulnerability. [1] The microcode patches have been shown to significantly reduce the performance of some heavily-vectorized loads. [7] Patches to mitigate the effects of the vulnerability have also been created as part of the forthcoming version 6.5 release of the Linux kernel. [8]
By default, with the updated microcode, the processor would still indicate support for RTM but would always abort the transaction. System software is able to detect this mode of operation and mask support for TSX/TSX-NI from the CPUID instruction, preventing detection of TSX/TSX-NI by applications. System software may also enable the ...
This approach provides a relatively straightforward method of ensuring software compatibility between different products within a processor family. Some hardware vendors, notably IBM and Lenovo, use the term microcode interchangeably with firmware. In this context, all code within a device is termed microcode, whether it is microcode or machine ...
On smartphones, tablets, and other devices, an over-the-air update is a firmware or operating system update that is downloaded by the device over the internet. Previously, users had to connect these devices to a computer over USB to perform an update. These updates may add features, patch security vulnerabilities, or fix software bugs.
Intel Software Guard Extensions (SGX) is a set of instruction codes implementing trusted execution environment that are built into some Intel central processing units (CPUs). They allow user-level and operating system code to define protected private regions of memory, called enclaves .
The Software Upgrade Protocol (or SUP) System is a set of programs developed by Carnegie Mellon University in the 1980s [1] (as was the Andrew File System).It provides for collections of files to be maintained in identical versions across a number of machines.