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

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Message-ID: <CAN_1RduD=yh0vjVdb3RwQn9ivxcBEGgJ3aTXuGgj4=FEznYmXg@mail.gmail.com>
Date:	Sat, 23 Jun 2012 14:01:59 +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 12:18:29PM +0800, Peiyong Feng wrote:
>> 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?
>
> What do you mean by this?

I mean that although the main line kernel cannot accept this patch, and
uhook is very useful to play a rule as a debug tool. Is there some where else
that can hold this tool, and let more people use the uhook?
>
>> > 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
>
> Good luck :)
>
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