From: Xie Yongji <xieyongji@bytedance.com>
To: mst@redhat.com, jasowang@redhat.com, stefanha@redhat.com,
axboe@kernel.dk
Cc: virtualization@lists.linux-foundation.org,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v3] virtio-blk: Add validation for block size in config space
Date: Thu, 17 Jun 2021 13:10:04 +0800 [thread overview]
Message-ID: <20210617051004.146-1-xieyongji@bytedance.com> (raw)
This ensures that we will not use an invalid block size
in config space (might come from an untrusted device).
Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
---
drivers/block/virtio_blk.c | 29 +++++++++++++++++++++++------
1 file changed, 23 insertions(+), 6 deletions(-)
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index b9fa3ef5b57c..bbdae989f1ea 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -696,6 +696,28 @@ static const struct blk_mq_ops virtio_mq_ops = {
static unsigned int virtblk_queue_depth;
module_param_named(queue_depth, virtblk_queue_depth, uint, 0444);
+static int virtblk_validate(struct virtio_device *vdev)
+{
+ u32 blk_size;
+
+ if (!vdev->config->get) {
+ dev_err(&vdev->dev, "%s failure: config access disabled\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ if (!virtio_has_feature(vdev, VIRTIO_BLK_F_BLK_SIZE))
+ return 0;
+
+ blk_size = virtio_cread32(vdev,
+ offsetof(struct virtio_blk_config, blk_size));
+
+ if (blk_size < SECTOR_SIZE || blk_size > PAGE_SIZE)
+ __virtio_clear_bit(vdev, VIRTIO_BLK_F_BLK_SIZE);
+
+ return 0;
+}
+
static int virtblk_probe(struct virtio_device *vdev)
{
struct virtio_blk *vblk;
@@ -707,12 +729,6 @@ static int virtblk_probe(struct virtio_device *vdev)
u8 physical_block_exp, alignment_offset;
unsigned int queue_depth;
- if (!vdev->config->get) {
- dev_err(&vdev->dev, "%s failure: config access disabled\n",
- __func__);
- return -EINVAL;
- }
-
err = ida_simple_get(&vd_index_ida, 0, minor_to_index(1 << MINORBITS),
GFP_KERNEL);
if (err < 0)
@@ -994,6 +1010,7 @@ static struct virtio_driver virtio_blk = {
.driver.name = KBUILD_MODNAME,
.driver.owner = THIS_MODULE,
.id_table = id_table,
+ .validate = virtblk_validate,
.probe = virtblk_probe,
.remove = virtblk_remove,
.config_changed = virtblk_config_changed,
--
2.11.0
next reply other threads:[~2021-06-17 5:10 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-17 5:10 Xie Yongji [this message]
2021-06-22 10:11 ` [PATCH v3] virtio-blk: Add validation for block size in config space Stefan Hajnoczi
2021-06-22 11:49 ` Yongji Xie
2021-07-05 18:23 ` Michael S. Tsirkin
2021-07-06 3:57 ` Yongji Xie
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