samples/vfio-mdev/mbochs.c · 2a7e1211e130c51a2b5743ecf247645ac8e936ee · Tobias Schramm / linux-pinebook-pro

6 years ago

sample: vfio-mdev: avoid deadlock in mdev_access() · 498e8bf5


mdev_access() calls mbochs_get_page() with mdev_state->ops_lock held,
while mbochs_get_page() locks the mutex by itself.
It leads to unavoidable deadlock.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

498e8bf5

History

sample: vfio-mdev: avoid deadlock in mdev_access()

Alexey Khoroshilov authored 6 years ago


mdev_access() calls mbochs_get_page() with mdev_state->ops_lock held,
while mbochs_get_page() locks the mutex by itself.
It leads to unavoidable deadlock.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

Code owners

Assign users and groups as approvers for specific file changes. Learn more.

Admin message