Reading at malicious_x = 0xffffffffffdfee0e.Bad news for anyone still rocking a really, really old Intel processor today, as the CPU giant has announced it's going to stop developing microcode updates to deal with the ongoing security problems caused by Spectre and Meltdown for certain types of architecture. Reading at malicious_x = 0xffffffffffdfee0d. Reading at malicious_x = 0xffffffffffdfee0c. Reading at malicious_x = 0xffffffffffdfee0b. Reading at malicious_x = 0xffffffffffdfee0a. Reading at malicious_x = 0xffffffffffdfee09. Reading at malicious_x = 0xffffffffffdfee08. Reading at malicious_x = 0xffffffffffdfee07. Reading at malicious_x = 0xffffffffffdfee06. Reading at malicious_x = 0xffffffffffdfee05. Reading at malicious_x = 0xffffffffffdfee04. Reading at malicious_x = 0xffffffffffdfee03. Reading at malicious_x = 0xffffffffffdfee02. Reading at malicious_x = 0xffffffffffdfee01. Reading at malicious_x = 0xffffffffffdfee00. Reading at malicious_x = 0xffffffffffdfedff. Reading at malicious_x = 0xffffffffffdfedfe. Reading at malicious_x = 0xffffffffffdfedfd. Reading at malicious_x = 0xffffffffffdfedfc. Reading at malicious_x = 0xffffffffffdfedfb. Reading at malicious_x = 0xffffffffffdfedfa. Reading at malicious_x = 0xffffffffffdfedf9. Reading at malicious_x = 0xffffffffffdfedf8. See this old thread of mine for all of the resources. This would garble any retrieved memory in Virtualization scenarios.AMD Zen with SME/SEV (Secure Memory Encryption/Secure Encrypted Virtualization).Stuff that’s got interesting features to disrupt/disable Spectre (But has a better chance than anything not on this list) Intel Itanium aka IA64 (This architecture is amazing and bizarre altogether).VIA C7 - but does have a basic branch prediction scheme.Includes Raspberry Pi 3 and many Android Phones.ARM Cortex-A53 MPCore - in-order dual issue, with a branch predictor, according to ARM is not affected.Pentium 1 (Non Pro) and clones based on the P5 architecture.Transmeta Crusoe - Archtitecture 1 Architecture 2.Now you may be thinking, wait these can only be really old CPU’s! And you’d be wrong! They however certainly aren’t the fastest CPU’s, but if you need something to be tinfoil hat secure, this is where you’d look. It is these faithful old fashioned in-order execution CPU’s which due to their rigorous sequential execution are immune to Spectre. I recently saw that some netbook processors have in order execution and that it's supposedly pretty old, I got interested and tried to look up. reddit ELI5: What's the difference between In-order vs. I wont explain these architectural differences here, the linked Wiki pages and materials are best referenced as a good starting point. Processors that would faithfully execute one instruction after another, often wasting a lot of cycles because some instructions take longer than others. (See Cortex-A8)īefore we had out of order and speculative execution architectures however, we had in-order execution. But there are some in-order execution processors with branch prediction and speculative issuing that are immune. Spectre should not work against in-order execution processors without branch prediction or other speculative features. The Spectre & Meltdown vulnerability relies on a CPU making use of speculative execution specifically tied with branch prediction, together with Out of order execution architecture processors.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |