[PATCH 0/2] Protect against iommu driver disconnect

[Alex Williamson]

Michael Tsirkin pointed out that file operations on /dev/vfio/vfio
dereference iommu_driver and iommu_data without a lock.  If releasing
a group or unsetting the container occurs concurrently, we could race.
We currently use a mutex when setting this association, so we can
convert to a rwsem keeping the existing mutex critical sections as
down_writes and add down_reads where these are used.  Thanks,

Alex

---

Alex Williamson (2):
      vfio: Convert container->group_lock to rwsem
      vfio: Use down_reads to protect iommu disconnects


 drivers/vfio/vfio.c |   83 +++++++++++++++++++++++++++++++++++----------------
 1 file changed, 57 insertions(+), 26 deletions(-)
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/