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On 06-5e-03 20200609 was good, but 20200616 removes SRBDS mitigation.

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
30/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
linux
Domain
operating-systems, security

Research direction

Compare the 20200609 and 20200616 microcode releases for the 06-5e-03 Skylake variant, then reproduce the reported behavior with linux-5.7.2 and its SRBDS mitigation status. Done means the release no longer downgrades the affected Skylake variants and the mitigation remains available.

Written by the indexing model from the issue text.

Description

I have an i3 which was working ok with the early-loaded 20200616 microcode (0xdc), so I assumed that the issues with 06-4e-03 for that version were specific to -4e-. With linux-5.7.2 I have Microcode listed as the mitigation for srbds.

But the 20200616 release downgrades both skylake variants to the microcode from last year and therefore loses the mitigation.

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