On Tue, Mar 19, 2019 at 1:06 PM Dragan Cvetic <[email protected]> wrote:
> - Add capability to get SD-FEC config data using ioctl
> XSDFEC_GET_CONFIG.
>
> - Add capability to set SD-FEC data order using ioctl
> SDFEC_SET_ORDER. The order of data blocks can change
> from input to output or to be maintained.
Commenting here only on the ABI, not the actual behavior of the driver:
> +static int xsdfec_get_config(struct xsdfec_dev *xsdfec, void __user *arg)
> +{
> + int err;
> +
> + err = copy_to_user(arg, &xsdfec->config, sizeof(xsdfec->config));
> + if (err) {
> + dev_err(xsdfec->dev, "%s failed for SDFEC%d", __func__,
> + xsdfec->config.fec_id);
> + err = -EFAULT;
> + }
Try to avoid printing error messages for things that can be triggered from
user space.
> static int xsdfec_set_turbo(struct xsdfec_dev *xsdfec, void __user *arg)
> {
> struct xsdfec_turbo turbo;
> @@ -670,6 +683,67 @@ static int xsdfec_add_ldpc(struct xsdfec_dev *xsdfec,
> void __user *arg)
> return ret;
> }
>
> +static int xsdfec_set_order(struct xsdfec_dev *xsdfec, void __user *arg)
> +{
> + bool order_invalid;
> + enum xsdfec_order order = *((enum xsdfec_order *)arg);
Generally speaking, you should never cast between __user pointers
and kernel pointers. It looks like this will actually dereference a
__user pointer, which is a security issue.
Another problem is that the command is defined as
#define XSDFEC_SET_ORDER _IOW(XSDFEC_MAGIC, 8, unsigned long *)
which would indicate an argument of type 'unsigned long __user * __user *',
which is incompatible with 'enum xsdfec_order __user *'. Both enum
and pointer types are variable length and should be avoided in
ioctl commands. Best make this a '__u64 __user *' or '__u32 __user *'.
> + */
> +#define XSDFEC_GET_CONFIG _IOR(XSDFEC_MAGIC, 6, struct xsdfec_config *)
> +/**
> * DOC: XSDFEC_GET_TURBO
> * @Parameters
> *
> @@ -322,4 +335,48 @@ xsdfec_calculate_shared_ldpc_table_entry_size(struct
> xsdfec_ldpc_params *ldpc,
> * ioctl that returns SD-FEC turbo param values
> */
> #define XSDFEC_GET_TURBO _IOR(XSDFEC_MAGIC, 7, struct xsdfec_turbo *)
Also wrong type, the function takes a 'struct xsdfec_turbo __user *', not a
'struct xsdfec_turbo __user * __user *',
Arnd
