Proposed fix to protect the kernel from Spectre (& Meltdown).pic.twitter.com/qQZr4Iw2yw
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It really can't. That completely breaks logical layering and makes it hopelessly complex and therefore bug-ridden. And it probably exceeds limit on # of MTRRs.
honestly CLFLUSH would probably be "good enough" if we could CLFLUSH the sibling threads (on the same physical core) too. i wonder if there is a way to synchronize sysenter/sysexit in this way using the topology data we already have
As long as HT is there, attacker will have opportunities to observe cache effects. Exploit runs on both threads, synchronizing via shared mem spinlocks, executes syscall on one while probing cache from other.
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