[PATCH v2 00/12] virtio: Harden and test vring

[Andrew Scull <ascull@google.com>]

Continuing the theme of making the virtio code resilient against
corruption of the buffers shared with the device, this series focusses
on the vring.

It follows the example of Linux by keeping a private copy of the
descriptors and metadata for state tracking and only ever writing to the
descriptors that are shared with the device. I was able to test these
hardening steps in the sandbox by simulating device writes to the
queues.

From v1:
 - Fix build errors on SPL by making dependency on virtio drivers
   explicit

Andrew Scull (12):
  virtio_ring: Merge identical variables
  virtio_ring: Add helper to attach vring descriptor
  virtio_ring: Maintain a shadow copy of descriptors
  virtio_ring: Check used descriptors are chain heads
  dm: test: virtio: Test the virtio ring
  virtio: sandbox: Fix device features bitfield
  test: dm: virtio: Test notify before del_vqs
  test: dm: virtio: Split out virtio device tests
  virtio: sandbox: Bind RNG rather than block device
  test: dm: virtio: Test virtio device driver probing
  virtio: rng: Check length before copying
  test: dm: virtio_rng: Test virtio-rng with faked device

 drivers/virtio/virtio_ring.c    |  90 ++++++++++-----
 drivers/virtio/virtio_rng.c     |   3 +
 drivers/virtio/virtio_sandbox.c |   4 +-
 include/virtio_ring.h           |  12 ++
 test/dm/Makefile                |   6 +-
 test/dm/virtio.c                |  99 ----------------
 test/dm/virtio_device.c         | 195 ++++++++++++++++++++++++++++++++
 test/dm/virtio_rng.c            |  52 +++++++++
 8 files changed, 328 insertions(+), 133 deletions(-)
 create mode 100644 test/dm/virtio_device.c
 create mode 100644 test/dm/virtio_rng.c

-- 
2.35.1.1178.g4f1659d476-goog