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 v2: * Add R-b from Kevin & Reinette (thanks!) * Remove unused hwirqs in 5/ and avoid unnecessary hwirq lookup in cleanup and init unwind in 6/ 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 | 105 +++++++++---- drivers/vfio/virqfd.c | 21 +++ include/linux/vfio.h | 2 + 5 files changed, 205 insertions(+), 106 deletions(-) -- 2.44.0
