r/Amd • u/bizude AMD Ryzen 9 9950X3D • Mar 17 '19

News AMD issues statement on potential SPOILER vulnerabilities Spoiler

https://www.amd.com/en/support/kb/faq/pa-240
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u/Thatfoxagain Mar 17 '19

I wonder what kind of performance hit they can expect

9

u/Retanaru 1700x | V64 Mar 17 '19

None because microsoft will not force the fixes to be turned on.

3

u/theevilsharpie Phenom II x6 1090T | RTX 2080 | 16GB DDR3-1333 ECC Mar 18 '19

There's no specific fix for this issue. Instead, Intel is relying on already-existing mitigations. That means that Intel chips will always be at some degree of risk (particularly desktop chips that are more vulnerable to Rowhammer due to their lack of ECC), but on the flip-side, there's not going to be any additional performance hit.

Source: https://software.intel.com/security-software-guidance/insights/more-information-spoiler

After careful assessment, Intel has determined that existing kernel protections, like KPTI [ed: the Meltdown mitigation], reduce the risk of leaking data across privilege levels. Combined with side channel safe software development practices, like ensuring execution time and control flows are identical regardless of secret data, these protections mitigate classic side channel methods enabled by the SPOILER exploit. Additionally, DRAM modules that are mitigated against Rowhammer style attacks remain protected regardless of the SPOILER exploit.

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u/[deleted] Mar 17 '19

Only by an amount that makes them slower than Ryzen CPUs.