x86/entry: Have entry_ibpb() invalidate return predictions

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entry_ibpb() should invalidate all indirect predictions, including return
target predictions. Not all IBPB implementations do this, in which case the
fallback is RSB filling.

Prevent SRSO-style hijacks of return predictions following IBPB, as the return
target predictor can be corrupted before the IBPB completes.

  [ bp: Massage. ]

Signed-off-by: Johannes Wikner <kwikner@ethz.ch>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: <stable@kernel.org>

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Johannes Wikner 2024-09-23 20:49:36 +02:00 • committed by Borislav Petkov (AMD)

parent 3ea87dfa31

commit 50e4b3b940

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