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Linux Adjusts "Meltdown Lite" Mitigation Handling On Newer Zen 5 CPUs
Linus Torvalds took to some coding himself today to fix a user-address masking non-canonical speculation issue
Linus Torvalds took to some coding himself today to fix a user-address masking non-canonical speculation issue. The Linux kernel needed an adaptation for this "Meltdown Lite" issue due to different behavior with the latest AMD Zen 5 processors. Now, the kernel surrounds the access with a STAC/CLAC pair, and those instructions end up serializing execution on older Zen architectures, which closes the speculation window.
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