diff options
| author | Maxime Coquelin <maxime.coquelin@redhat.com> | 2022-08-31 17:49:23 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2022-09-27 18:32:45 -0400 |
| commit | 46f8a29272e51b6df7393d58fc5cb8967397ef2b (patch) | |
| tree | c0b4ecf355de210b969535f63d017c7dec0fe64e /drivers/vdpa/vdpa_user | |
| parent | 37fafe6b61e4f15d977982635bb785f4e605f7cd (diff) | |
vduse: prevent uninitialized memory accesses
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: c8a6153b6c59 ("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>
Diffstat (limited to 'drivers/vdpa/vdpa_user')
| -rw-r--r-- | drivers/vdpa/vdpa_user/vduse_dev.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c index 41c0b29739f1..35dceee3ed56 100644 --- a/drivers/vdpa/vdpa_user/vduse_dev.c +++ b/drivers/vdpa/vdpa_user/vduse_dev.c @@ -673,10 +673,15 @@ 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); } |