This patch summarizes the status of hardening and TODO of hardening virtio core and drivers. Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx> --- Documentation/security/virtio/core.rst | 49 ++++++++++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 50 insertions(+) create mode 100644 Documentation/security/virtio/core.rst diff --git a/Documentation/security/virtio/core.rst b/Documentation/security/virtio/core.rst new file mode 100644 index 000000000000..b8baa104d7c8 --- /dev/null +++ b/Documentation/security/virtio/core.rst @@ -0,0 +1,49 @@ +================ +Virtio hardening +================ + +The virtio core and drivers should not trust the devices. This means +all kinds of input from the device must be validated before being +used. This document summarizes the current status and TODO for this +validation/hardening efforts. + + +Status +====== + +The virtio core and drivers has done some basic hardening: + +* Config callback hardening: The core makes sure the config interrupt + callbacks are enabled after the driver is ready and disable before + the driver is removed. + +* Descriptor ring hardening: The metadata of a descriptor were copied + and stored in a driver private memory that can not be accessed by the + device. The eliminates the device triggerable behaviours through the + descriptor ring. + +* Device configuration space validation: Some of the virtio drivers + validates the fields of device configuration space before try to use + them. + + +TODO +==== + +* Input buffer length validation: The virtio core needs to validate + the input buffer length validation before passing them to individual + virtio drivers. + +* Virtqueue callback hardening: The virtio core (or with the help of + the drivers) should guarantee that the virtqueue callbacks should not + be triggered before the driver is ready or after the driver is + removed. + +* Transport specific data validation: The virtio transport driver should + validate the virtio transport specific data provided by the device + before trying to use them in the probing. + +* Device specific validation: Driver should validate the device specific + metadata before being used by a specific subsystem. + + diff --git a/MAINTAINERS b/MAINTAINERS index 673b9f9b8d8a..b33cc5c751c1 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -21516,6 +21516,7 @@ S: Maintained F: Documentation/ABI/testing/sysfs-bus-vdpa F: Documentation/ABI/testing/sysfs-class-vduse F: Documentation/devicetree/bindings/virtio/ +F: Documentation/security/virtio/core.rst F: drivers/block/virtio_blk.c F: drivers/crypto/virtio/ F: drivers/net/virtio_net.c -- 2.25.1
