Re: [PATCH v3] hw/pvrdma: Protect against buggy or malicious guest driver

[Michael Tokarev]

Ping? This is from April this year, half a year ago.
Can this be applied or?

Marcel said it should wait a week or two, I think that's been done already.. ;)

Thanks,

/mjt

03.04.2022 12:52, Yuval Shaia wrote:
> Guest driver might execute HW commands when shared buffers are not yet
> allocated.
> This could happen on purpose (malicious guest) or because of some other
> guest/host address mapping error.
> We need to protect againts such case.
>
> Fixes: CVE-2022-1050
>
> Reported-by: Raven <wxhusst@gmail.com>
> Signed-off-by: Yuval Shaia <yuval.shaia.ml@gmail.com>
> ---
> v1 -> v2:
>         * Commit message changes
> v2 -> v3:
>         * Exclude cosmetic changes
> ---
>   hw/rdma/vmw/pvrdma_cmd.c | 6 ++++++
>   1 file changed, 6 insertions(+)
>
> diff --git a/hw/rdma/vmw/pvrdma_cmd.c b/hw/rdma/vmw/pvrdma_cmd.c
> index da7ddfa548..89db963c46 100644
> --- a/hw/rdma/vmw/pvrdma_cmd.c
> +++ b/hw/rdma/vmw/pvrdma_cmd.c
> @@ -796,6 +796,12 @@ int pvrdma_exec_cmd(PVRDMADev *dev)
>   
>       dsr_info = &dev->dsr_info;
>   
> +    if (!dsr_info->dsr) {
> +            /* Buggy or malicious guest driver */
> +            rdma_error_report("Exec command without dsr, req or rsp buffers");
> +            goto out;
> +    }
> +
>       if (dsr_info->req->hdr.cmd >= sizeof(cmd_handlers) /
>                         sizeof(struct cmd_handler)) {
>           rdma_error_report("Unsupported command");