Re: setting up CDB filters in udev (was Re: [PATCH v2 0/3] block:add queue-private command filter, editable via sysfs)

[Alan Cox]

>  * Devices are given standard filter matching the device class.  Any
>    !CAP_SYS_RAWIO user can only issue commands allowed by the filter.
> 
>  * CAP_SYS_RAWIO can issue an ioctl to disable the filter all
>    accessors of the fd and transfer it.
> 
> That should be enough, no?

No 

a - there are lots of cases you want to allow only a subset of commands.

b - if you are using a BPF filter which is the obvious way to do it then
the flexibility comes for free without any extra complexity as the kernel
provides a generic implementation, and even a JIT for complex cases.

Alan
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