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SubjectRe: "copy_to_user" function not working in stable build "2.6.36.4"
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On Sun, Jul 27, 2014 at 10:22 AM, zubraz singha <zubrajsingha@gmail.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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