On Mon, Sep 21, 2009 at 5:46 AM, hermann pitton <hermann-pit...@arcor.de> wrote:
>
> Am Montag, den 21.09.2009, 05:40 +0200 schrieb Markus Rechberger:
>> while porting the S2api to userspace I came accross the S2-API definition
>> itself
>>
>> #define FE_SET_PROPERTY _IOW('o', 82, struct dtv_properties)
>> #define FE_GET_PROPERTY _IOR('o', 83, struct dtv_properties)
>>
>> while looking at this, FE_GET_PROPERTY should very likely be _IOWR
>>
>> in dvb-frontend.c:
>> ----
>> if(cmd == FE_GET_PROPERTY) {
>>
>> tvps = (struct dtv_properties __user *)parg;
>>
>> dprintk("%s() properties.num = %d\n", __func__, tvps->num);
>> dprintk("%s() properties.props = %p\n", __func__,
>> tvps->props);
>> ...
>> if (copy_from_user(tvp, tvps->props, tvps->num *
>> sizeof(struct dtv_property)))
>> ----
>>
>> Regards,
>> Markus
>
> Seems to be a big issue.
>
> Why you ever want to write to a get property?
>
to read out the API version for example.
tvps->num is also used in order to check the boundaries of the property array.
Markus
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