Re: [PATCH v3 07/18] nitro_enclaves: Init misc device providing the ioctl interface

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On 01.06.20 05:04, Benjamin Herrenschmidt wrote:


On Thu, 2020-05-28 at 15:12 +0200, Greg KH wrote:
So at runtime, after all is booted and up and going, you just ripped
cores out from under someone's feet?  :)

And the code really handles writing to that value while the module is
already loaded and up and running?  At a quick glance, it didn't seem
like it would handle that very well as it only is checked at ne_init()
time.

Or am I missing something?

Anyway, yes, if you can dynamically do this at runtime, that's great,
but it feels ackward to me to rely on one configuration thing as a
module parameter, and everything else through the ioctl interface.
Unification would seem to be a good thing, right?

I personally still prefer a sysfs file :) I really don't like module
parameters as a way to do such things.

I think we're going in circles :).

A module parameter initialized with module_param_cb gives us a sysfs file that can also have a default parameter set through easily available tooling.

The ioctl has two downsides:

  1) It relies on an external application
2) The permission check would be strictly limited to CAP_ADMIN, sysfs files can have different permissions

So I fail to see how a module parameter is *not* giving both of you and me what we want? Of course only if it implements the callback. It was missing that and apologize for that oversight.


Alex



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