linux-kernel - Re: "copy_to_user" function not working in stable build "2.6.36.4"

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Message-ID: <CAFLxGvyD-R-ex8OadHV9pkz7gGOf09_8qfAwq-xB1URZqFH33w@mail.gmail.com>
Date:	Sun, 27 Jul 2014 10:30:07 +0200
From:	Richard Weinberger <richard.weinberger@...il.com>
To:	zubraz singha <zubrajsingha@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: "copy_to_user" function not working in stable build "2.6.36.4"

On Sun, Jul 27, 2014 at 10:22 AM, zubraz singha <zubrajsingha@...il.com> wrote:
> Hey Guys,
> While writing a read proc entry for Linux kernel (version 2.6.36.4), I
> found that the kernel function "copy_to_user" is not working properly.
> The kernel function used internally by "copy_to_user" i.e.
> "__copy_to_user" works fine and also this same function "copy_to_user"
> works quite well on the higher kernel versions,  I tried it on Linux
> kernel version 3.14.  The kernel source code for  "2.6.36.4" doesn't
> have a definition for a function i.e "_copy_to_user",  which is being
> called internally by "copy_to_user". However the function
> "_copy_to_user" has a definition  in higher version kernels like 3.14
> etc. I cannot update my kernel,  Is there any way I can fix this issue
> by manually patching the kernel. There are two possible ways in which
> I think it can be solved.
>
> - Write a definition for the _copy_to_user in "2.6.36.4", which will
> have the same "access_ok" check and corresponding  "__copy_to_user"
> function call.
> - Modifying the function "copy_to_user" and adding the "access_ok"
> check and the "__copy_to_user" function.

2.6.36.x is not a supported release. The issue is maybe fixed in other
versions but as
your release is not a stable kernel you are on your own. Sorry.

-- 
Thanks,
//richard
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