[0/7] vfio: Interrupt eventfd hardening

Message

Alex Williamson March 6, 2024, 9:14 p.m. UTC

This series hardens interrupt code relative to eventfd registration
across several vfio bus drivers, ensuring that NULL eventfds cannot
be triggered by users.  Several other more minor issues were discovered
and fixed along the way.

Thanks to Reinette for identifying this latent vulnerability.  Thanks,

Alex

Alex Williamson (7):
  vfio/pci: Disable auto-enable of exclusive INTx IRQ
  vfio/pci: Lock external INTx masking ops
  vfio: Introduce interface to flush virqfd inject workqueue
  vfio/pci: Create persistent INTx handler
  vfio/platform: Disable virqfds on cleanup
  vfio/platform: Create persistent IRQ handlers
  vfio/fsl-mc: Block calling interrupt handler without trigger

 drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c    |   7 +-
 drivers/vfio/pci/vfio_pci_intrs.c         | 176 +++++++++++++---------
 drivers/vfio/platform/vfio_platform_irq.c | 109 ++++++++++----
 drivers/vfio/virqfd.c                     |  21 +++
 include/linux/vfio.h                      |   2 +
 5 files changed, 209 insertions(+), 106 deletions(-)