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Yes, it is. OSes protect that ability to prevent malicious microcode, too. The update mechanism is published by Intel, too. Section 9.11 (not page 9.11) https:/
by burnte 9y ago
Yes, it is. OSes protect that ability to prevent malicious microcode, too. The update mechanism is published by Intel, too. Section 9.11 (not page 9.11) https://www.intel.com/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-software-developer-vol-3a-part-1-manual.pdf https://www.intel.com/content/dam/www/public/us/en/documents...
- tomxor 9y agoI always assumed that the CPU itself would have an internal signature verification mechanism built in. But after searching it seems the OS or BIOS is responsible for quite a lot... I haven't found anything clearly stating if and where cryptographic signatures are verified. Once source at least suggested that it's only present on >2013 CPUs ! [edit] This is an interesting old paper on x86 microcode security: https://www.dcddcc.com/docs/2014_paper_microcode.pdf https://www.dcddcc.com/docs/2014_paper_microcode.pdf