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um: virtio_uml: Disallow modular build 

commit bf9f80cf0c upstream.

This driver *can* be a module, but then its parameters (socket path)
are untrusted data from inside the VM, and that isn't allowed. Allow
the code to only be built-in to avoid that.

Fixes: 5d38f32499 ("um: drivers: Add virtio vhost-user driver")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Anton Ivanov <anton.ivanov@cambridgegreys.co.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Johannes Berg 2019-10-08 17:43:21 +02:00 committed by Greg Kroah-Hartman
parent 0efee942c6
commit d8cdfd9bc1
2 changed files with 3 additions and 3 deletions
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2
arch/um/drivers/Kconfig
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@ -337,7 +337,7 @@ config UML_NET_SLIRP
endmenu
config VIRTIO_UML
tristate "UML driver for virtio devices"
bool "UML driver for virtio devices"
select VIRTIO
help
This driver provides support for virtio based paravirtual device

4
arch/um/drivers/virtio_uml.c
View File

@ -4,12 +4,12 @@
*
* Copyright(c) 2019 Intel Corporation
*
* This module allows virtio devices to be used over a vhost-user socket.
* This driver allows virtio devices to be used over a vhost-user socket.
*
* Guest devices can be instantiated by kernel module or command line
* parameters. One device will be created for each parameter. Syntax:
*
* [virtio_uml.]device=<socket>:<virtio_id>[:<platform_id>]
* virtio_uml.device=<socket>:<virtio_id>[:<platform_id>]
* where:
* <socket> := vhost-user socket path to connect
* <virtio_id> := virtio device id (as in virtio_ids.h)