I encounterd the problem when i try to modprobe the module. this module is modified. but the module is for the kernel 2.6.33.4, also the kernel is 2.6.33.4. When i tried to modprobe module, the error happned:"disagrees about version of symbol module_layout".
i don't know how it happened and how to solve it. i'm very confused.
Check out the address for module_layout from System.map from the /boot directory and also from the System.map generated when you compile your module. I bet it will be different. You can altogether try compiling yourself a new kernel with module versioning disabled to avoid something like this.
It sounds like you have built your module against a kernel that is different than the running kernel into which you are attempting to insert the module.
Related
I am trying to build a kernel module while compiling the kernel image, by changing the config symbol value to `'m'. But I do not see any module file generated. Please let me know if I need to take some extra steps to generated a module. If I change the flag to 'y' the code works fine.
Also, in online tutorials I have seen both of the following
>insmod temp.ko
also,
>insmod temp.o
Which one is correct type for a dynamically loadable module?
For compiling loadable kernel modules in Linux tree apply the following command
make modules
.ko is the proper kernel module extension. If .o is tried with insmod, then Invalid module format error will be displayed.
if your module has dependencies to other modules, then:
make modules to build modules
make modules_install to install them
modprobe temp.ko to load temp module and it's dependencies
if your module is simple and has no dependencies, then:
make modules to build modules
cd /path/to/module
insmod temp.ko
Wasn't using modules target in make.
First, run make menuconfig, search the module you want to build using /. Next choose 'm' or 'y' depending on when you want to compile it as a part of the kernel or build it as a module.
(If you don't want to build the entire kernel and just a single module):
Next, in the linux directory (assuming you are using vanilla kernel) run the following commands which will generate the scripts and required configuration files based on your .config
make prepare
make scripts
Now simply build the module using:
make M=<path/to/module/dir>
Finally you should have a kernel object/module (.ko) in the directory if you have selected m
hope this helps.
I want to checkout kernel sources to build a kernel module. However when I want to insmod the module I get a "Invalid module format" error. The kernel versions appaerently do not match.
uname -r results in version 3.0.35-gd0fc8d0.
I am on a i.Mx6 Processor and have to checkout a branch from here: https://github.com/boundarydevices/linux-imx6
But I can't seem to find the exact matching kernel version?
You need to build a kernel module against the specific kernel version so that they are compatible with each other.
you should be able to know the kernel version with which a module is built using modinfo command.
#modinfo kernel_mod.ko
look at vermagic field here.
If you are in a hurry, you can try to change Vermagic of kernel module in order to insert the module.
Reference: http://www.linuxquestions.org/questions/linux-kernel-70/how-to-change-the-vermagic-of-a-module-728387/
Or
just google, "Change vermagic of kernel module".
By the way, you should keep in mind that this method can cause a problem.
I am running with kernel version-2.6.35
When I hit uname -r it gives as 2.6.35-22-generic
Compiled a module from Kernel-2.6.35 source tree,
But it fails to insert the module in my running kernel.
I don't have any clue.
can anybody help me out of this !!
Thank you.
Have to compile LKM against the correct kernel version i.e. output of uname -r. In your case you have downloaded the kernel version-2.6.35 source tree and compiled your LKM against it. While inserting LKM, checks for the KERNEL_VERSION, if they match will not get any errors while module insertion but if they mismatch fails to insert the module.
You want to ensure that CONFIG_MODVERSIONS is enable in the running Kernel, 2.6.35-22-generic in your case. When you the build a Kernel Module from the 2.6.35 sources the running Kernel will allow modules with matching symbols to be loaded or if symbols are missing, it'll fail to load.
Not having CONFIG_MODVERSIONS enabled means that you MUST match the version between the Kernel version and the module.
I am supposing that you are using the official kernel tree, but you are trying to load your module in your distribution. You must you the kernel source/header from your Linux distribution. I am supposing this because of this version 2.6.35-22-generic, -22-generic it is not part of the official version name.
I have to load a kernel module to run a program. I searched online and found out I need to use commands like insmod, etc to do that. But the command doesn't seem to be installed in my laptop. I am working on a Mac. I tried running as a admin by sudo command. tried all commands like whereis, location and find still dont get an ans. Can anyone please help. If there is an alternative to load a kernel module to run some program files on, alternative will be appreciated.
Error: You may need to load a kernel module to support tap.
OS X uses a completely different kernel extension model than Linux. If you have a compatible kernel extension, you can use kextload(8) to load it.
How can one build a kernel module that loads into an exiting binary kernel?
It seems that loading depends on the BuildID stored inside the module, but what is needed to match those? I expect the binary kernel to be the result of some git revision, using a default .config (copied from arch/.../configs). How can I decide which revision and .config is needed to build module that would be accepted by the existing kernel?
It seems that matching the of the ARCH and KERNELRELEASE properties as shown by uname -a is not enough.
You will need the source code for the current kernel you are running. These are usually packaged separately (you don't mention your distro). However once done you should be able to build the external module against that kernel following the instructions: Documentation/kbuild/modules.txt