linux-kernel - Re: [PATCH] Implement uhook(call kernel func from userspace) driver

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Date:	Sat, 23 Jun 2012 12:18:29 +0800
From:	Peiyong Feng <peiyong.feng.kernel@...il.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Implement uhook(call kernel func from userspace) driver

2012/6/23 Greg KH <gregkh@...uxfoundation.org>:
> On Sat, Jun 23, 2012 at 11:20:35AM +0800, Peiyong Feng wrote:
>> Hi all,
>>
>> This patch implement the uhook kernel driver. Here are some ideals and
>> explanations:
>>
>> 1. What is uhook
>>
>> uhook(userspace kernel hook) means call kernel function from
>> userspace. That is to say, we can
>>
>> write a function in kernel space and call it in userspace while the
>> kernel Image is running. For example:
>
> That's, um, "interesting", but is of course, nothing we can accept into
> the main kernel tree, as I'm sure you can understand.  Otherwise, you
> just created a few thousand undocumented system calls whose behavior
> changes every release which is not something we can accept.
>
> But it is a great hack, very nicely done.  I'm sure that some people
> will like it for debugging, although I'm not quite sure you got all of

Well, is there some other tree I can commit the patch?
> the user/kernel boundry conditions correct, and I know the 32/64bit
> issues aren't handled, which you might want to clean up sometime in the

I am still working on it. The ultimate aim is that the uhook module can process
any funciton and any data type
> future.
>
> greg k-h
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