Steve Sistare eafb81c50d vfio/type1: prevent underflow of locked_vm via exec() ... commit 046eca5018 upstream. When a vfio container is preserved across exec, the task does not change, but it gets a new mm with locked_vm=0, and loses the count from existing dma mappings. If the user later unmaps a dma mapping, locked_vm underflows to a large unsigned value, and a subsequent dma map request fails with ENOMEM in __account_locked_vm. To avoid underflow, grab and save the mm at the time a dma is mapped. Use that mm when adjusting locked_vm, rather than re-acquiring the saved task's mm, which may have changed. If the saved mm is dead, do nothing. locked_vm is incremented for existing mappings in a subsequent patch. Fixes: 73fa0d10d0 ("vfio: Type1 IOMMU implementation") Cc: stable@vger.kernel.org Signed-off-by: Steve Sistare <steven.sistare@oracle.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Link: https://lore.kernel.org/r/1675184289-267876-3-git-send-email-steven.sistare@oracle.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-03-10 09:40:13 +01:00
..
fsl-mc	vfio: Use kconfig if XX/endif blocks instead of repeating 'depends on'	2021-08-26 10:36:51 -06:00
mdev	VFIO update for v5.15-rc1	2021-09-02 13:41:33 -07:00
pci	vfio/pci: Fix vf_token mechanism when device-specific VF drivers are used	2022-04-20 09:34:13 +02:00
platform	vfio: platform: Do not pass return buffer to ACPI _RST method	2022-12-31 13:14:27 +01:00
Kconfig	vfio: Use kconfig if XX/endif blocks instead of repeating 'depends on'	2021-08-26 10:36:51 -06:00
Makefile
vfio_iommu_spapr_tce.c
vfio_iommu_type1.c	vfio/type1: prevent underflow of locked_vm via exec()	2023-03-10 09:40:13 +01:00
vfio_spapr_eeh.c
vfio.c	vfio: Clear the caps->buf to NULL after free	2022-08-25 11:40:41 +02:00
virqfd.c