On Tue, Nov 6, 2012 at 3:03 PM, Takashi Iwai <tiwai@xxxxxxx> wrote:
>
> Yeah, it's just uncovered in the patch. As a easy solution, apply the
> patch like below to disallow the udev fw loading when signature check
> is enforced.
>
>
> thanks,
>
> Takashi
>
> ---
> diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
> index 575bc4c..93121c3 100644
> --- a/drivers/base/firmware_class.c
> +++ b/drivers/base/firmware_class.c
> @@ -912,6 +912,13 @@ static int _request_firmware_load(struct firmware_priv *fw_priv, bool uevent,
> goto handle_fw;
> }
>
> + /* signature check isn't handled via udev fw loading */
> + if (sig_enforce) {
> + fw_load_abort(fw_priv);
> + direct_load = 1;
> + goto handle_fw;
> + }
> +
The above might be wrong if the firmware file doesn't exist in default
search paths. You should skip loading from user space only if
verify_signature() returns false. And the udev loading should be
resorted to if there is no such firmware file in default search paths.
> /* fall back on userspace loading */
> buf->fmt = PAGE_BUF;
>
Thanks,
--
Ming Lei
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