Re: Understanding execution context of netfilter hooks

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On Fri, Jul 17, 2009 at 9:19 PM, Jan Engelhardt<jengelh@xxxxxxxxxx> wrote:

>>So, the question, as mentioned in the beginning. What context is the
>>hook executing in which causes the code to behave differently from
>>when it executed in the module init method for instance?
>
> module_init either runs as user or kthread context. Your reading
> of files would most likely also fail in the latter.

I see, then this problem is not really netfilter specific I guess. I
guess I have many things to learn here. I suppose exec is also running
in user context when it reads files with kernel_read then.

If anyone knows of any good online documentation or book regarding
these different contexts I would be grateful for the info. Otherwise I
thank you for the feedback.

/Stefan
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