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vduse: prevent uninitialized memory accesses

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commit 46f8a29272 upstream.

If the VDUSE application provides a smaller config space
than the driver expects, the driver may use uninitialized
memory from the stack.

This patch prevents it by initializing the buffer passed by
the driver to store the config value.

This fix addresses CVE-2022-2308.

Cc: stable@vger.kernel.org # v5.15+
Fixes: c8a6153b6c ("vduse: Introduce VDUSE - vDPA Device in Userspace")
Reviewed-by: Xie Yongji <xieyongji@bytedance.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Message-Id: <20220831154923.97809-1-maxime.coquelin@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Maxime Coquelin
2022-08-31 17:49:23 +02:00
committed by Greg Kroah-Hartman
parent ea77482969
commit dc248ddf41
1 changed files with 7 additions and 2 deletions
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9
drivers/vdpa/vdpa_user/vduse_dev.c
View File

@@ -655,10 +655,15 @@ static void vduse_vdpa_get_config(struct vdpa_device *vdpa, unsigned int offset,
{
struct vduse_dev *dev = vdpa_to_vduse(vdpa);
if (offset > dev->config_size ||
len > dev->config_size - offset)
/* Initialize the buffer in case of partial copy. */
memset(buf, 0, len);
if (offset > dev->config_size)
return;
if (len > dev->config_size - offset)
len = dev->config_size - offset;
memcpy(buf, dev->config + offset, len);
}