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Linus Torvalds 0e33cf955f * Mitigate RFDS vulnerability

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Merge tag 'rfds-for-linus-2024-03-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 RFDS mitigation from Dave Hansen:
 "RFDS is a CPU vulnerability that may allow a malicious userspace to
  infer stale register values from kernel space. Kernel registers can
  have all kinds of secrets in them so the mitigation is basically to
  wait until the kernel is about to return to userspace and has user
  values in the registers. At that point there is little chance of
  kernel secrets ending up in the registers and the microarchitectural
  state can be cleared.

  This leverages some recent robustness fixes for the existing MDS
  vulnerability. Both MDS and RFDS use the VERW instruction for
  mitigation"

* tag 'rfds-for-linus-2024-03-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  KVM/x86: Export RFDS_NO and RFDS_CLEAR to guests
  x86/rfds: Mitigate Register File Data Sampling (RFDS)
  Documentation/hw-vuln: Add documentation for RFDS
  x86/mmio: Disable KVM mitigation when X86_FEATURE_CLEAR_CPU_BUF is set

2024-03-12 09:31:39 -07:00

core-scheduling.rst

uapi/linux/prctl: provide macro definitions for the PR_SCHED_CORE type argument

2021-09-29 13:00:05 +02:00

cross-thread-rsb.rst

Documentation/hw-vuln: Fix rST warning

2023-02-15 07:24:23 -05:00

gather_data_sampling.rst

Documentation/x86: Fix backwards on/off logic about YMM support

2023-08-01 15:28:24 -07:00

index.rst

Documentation/hw-vuln: Add documentation for RFDS