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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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