[PATCH net-next 00/12] ptr_ring fixes

[Michael S. Tsirkin]

This fixes a bunch of issues around ptr_ring use in net core.
One of these: "tap: fix use-after-free" is also needed on net,
but can't be backported cleanly.

I will post a net patch separately.

Lightly tested - Jason, could you pls confirm this
addresses the security issue you saw with ptr_ring?
Testing reports would be appreciated too.

Michael S. Tsirkin (12):
  ptr_ring: keep consumer_head valid at all times
  ptr_ring: clean up documentation
  ptr_ring: READ/WRITE_ONCE for __ptr_ring_empty
  tap: fix use-after-free
  ptr_ring: disallow lockless __ptr_ring_full
  Revert "net: ptr_ring: otherwise safe empty checks can overrun array
    bounds"
  skb_array: use __ptr_ring_empty
  ptr_ring: prevent queue load/store tearing
  tools/virtio: switch to __ptr_ring_empty
  tools/virtio: more stubs to fix tools build
  tools/virtio: copy READ/WRITE_ONCE
  tools/virtio: fix smp_mb on x86

 drivers/net/tap.c                |  3 --
 include/linux/ptr_ring.h         | 86 ++++++++++++++++++++++------------------
 include/linux/skb_array.h        |  2 +-
 tools/virtio/linux/kernel.h      |  2 +-
 tools/virtio/linux/thread_info.h |  1 +
 tools/virtio/ringtest/main.h     | 59 ++++++++++++++++++++++++++-
 tools/virtio/ringtest/ptr_ring.c |  2 +-
 7 files changed, 110 insertions(+), 45 deletions(-)
 create mode 100644 tools/virtio/linux/thread_info.h

-- 
MST