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Date: Sun, 27 Jul 2014 13:52:47 +0530 From: zubraz singha <zubrajsingha@...il.com> To: linux-kernel@...r.kernel.org Subject: "copy_to_user" function not working in stable build "2.6.36.4" 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. Zubraj -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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